diff options
Diffstat (limited to 'thirdparty/mbedtls/library/ssl_tls.c')
| -rw-r--r-- | thirdparty/mbedtls/library/ssl_tls.c | 8276 |
1 files changed, 8276 insertions, 0 deletions
diff --git a/thirdparty/mbedtls/library/ssl_tls.c b/thirdparty/mbedtls/library/ssl_tls.c new file mode 100644 index 0000000000..617dedb1b0 --- /dev/null +++ b/thirdparty/mbedtls/library/ssl_tls.c @@ -0,0 +1,8276 @@ +/* + * SSLv3/TLSv1 shared functions + * + * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the "License"); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * This file is part of mbed TLS (https://tls.mbed.org) + */ +/* + * The SSL 3.0 specification was drafted by Netscape in 1996, + * and became an IETF standard in 1999. + * + * http://wp.netscape.com/eng/ssl3/ + * http://www.ietf.org/rfc/rfc2246.txt + * http://www.ietf.org/rfc/rfc4346.txt + */ + +#if !defined(MBEDTLS_CONFIG_FILE) +#include "mbedtls/config.h" +#else +#include MBEDTLS_CONFIG_FILE +#endif + +#if defined(MBEDTLS_SSL_TLS_C) + +#if defined(MBEDTLS_PLATFORM_C) +#include "mbedtls/platform.h" +#else +#include <stdlib.h> +#define mbedtls_calloc calloc +#define mbedtls_free free +#endif + +#include "mbedtls/debug.h" +#include "mbedtls/ssl.h" +#include "mbedtls/ssl_internal.h" + +#include <string.h> + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +#include "mbedtls/oid.h" +#endif + +/* Implementation that should never be optimized out by the compiler */ +static void mbedtls_zeroize( void *v, size_t n ) { + volatile unsigned char *p = v; while( n-- ) *p++ = 0; +} + +/* Length of the "epoch" field in the record header */ +static inline size_t ssl_ep_len( const mbedtls_ssl_context *ssl ) +{ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + return( 2 ); +#else + ((void) ssl); +#endif + return( 0 ); +} + +/* + * Start a timer. + * Passing millisecs = 0 cancels a running timer. + */ +static void ssl_set_timer( mbedtls_ssl_context *ssl, uint32_t millisecs ) +{ + if( ssl->f_set_timer == NULL ) + return; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "set_timer to %d ms", (int) millisecs ) ); + ssl->f_set_timer( ssl->p_timer, millisecs / 4, millisecs ); +} + +/* + * Return -1 is timer is expired, 0 if it isn't. + */ +static int ssl_check_timer( mbedtls_ssl_context *ssl ) +{ + if( ssl->f_get_timer == NULL ) + return( 0 ); + + if( ssl->f_get_timer( ssl->p_timer ) == 2 ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "timer expired" ) ); + return( -1 ); + } + + return( 0 ); +} + +#if defined(MBEDTLS_SSL_PROTO_DTLS) +/* + * Double the retransmit timeout value, within the allowed range, + * returning -1 if the maximum value has already been reached. + */ +static int ssl_double_retransmit_timeout( mbedtls_ssl_context *ssl ) +{ + uint32_t new_timeout; + + if( ssl->handshake->retransmit_timeout >= ssl->conf->hs_timeout_max ) + return( -1 ); + + new_timeout = 2 * ssl->handshake->retransmit_timeout; + + /* Avoid arithmetic overflow and range overflow */ + if( new_timeout < ssl->handshake->retransmit_timeout || + new_timeout > ssl->conf->hs_timeout_max ) + { + new_timeout = ssl->conf->hs_timeout_max; + } + + ssl->handshake->retransmit_timeout = new_timeout; + MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs", + ssl->handshake->retransmit_timeout ) ); + + return( 0 ); +} + +static void ssl_reset_retransmit_timeout( mbedtls_ssl_context *ssl ) +{ + ssl->handshake->retransmit_timeout = ssl->conf->hs_timeout_min; + MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs", + ssl->handshake->retransmit_timeout ) ); +} +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + +#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) +/* + * Convert max_fragment_length codes to length. + * RFC 6066 says: + * enum{ + * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255) + * } MaxFragmentLength; + * and we add 0 -> extension unused + */ +static unsigned int mfl_code_to_length[MBEDTLS_SSL_MAX_FRAG_LEN_INVALID] = +{ + MBEDTLS_SSL_MAX_CONTENT_LEN, /* MBEDTLS_SSL_MAX_FRAG_LEN_NONE */ + 512, /* MBEDTLS_SSL_MAX_FRAG_LEN_512 */ + 1024, /* MBEDTLS_SSL_MAX_FRAG_LEN_1024 */ + 2048, /* MBEDTLS_SSL_MAX_FRAG_LEN_2048 */ + 4096, /* MBEDTLS_SSL_MAX_FRAG_LEN_4096 */ +}; +#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ + +#if defined(MBEDTLS_SSL_CLI_C) +static int ssl_session_copy( mbedtls_ssl_session *dst, const mbedtls_ssl_session *src ) +{ + mbedtls_ssl_session_free( dst ); + memcpy( dst, src, sizeof( mbedtls_ssl_session ) ); + +#if defined(MBEDTLS_X509_CRT_PARSE_C) + if( src->peer_cert != NULL ) + { + int ret; + + dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) ); + if( dst->peer_cert == NULL ) + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + + mbedtls_x509_crt_init( dst->peer_cert ); + + if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p, + src->peer_cert->raw.len ) ) != 0 ) + { + mbedtls_free( dst->peer_cert ); + dst->peer_cert = NULL; + return( ret ); + } + } +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) + if( src->ticket != NULL ) + { + dst->ticket = mbedtls_calloc( 1, src->ticket_len ); + if( dst->ticket == NULL ) + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + + memcpy( dst->ticket, src->ticket, src->ticket_len ); + } +#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */ + + return( 0 ); +} +#endif /* MBEDTLS_SSL_CLI_C */ + +#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) +int (*mbedtls_ssl_hw_record_init)( mbedtls_ssl_context *ssl, + const unsigned char *key_enc, const unsigned char *key_dec, + size_t keylen, + const unsigned char *iv_enc, const unsigned char *iv_dec, + size_t ivlen, + const unsigned char *mac_enc, const unsigned char *mac_dec, + size_t maclen ) = NULL; +int (*mbedtls_ssl_hw_record_activate)( mbedtls_ssl_context *ssl, int direction) = NULL; +int (*mbedtls_ssl_hw_record_reset)( mbedtls_ssl_context *ssl ) = NULL; +int (*mbedtls_ssl_hw_record_write)( mbedtls_ssl_context *ssl ) = NULL; +int (*mbedtls_ssl_hw_record_read)( mbedtls_ssl_context *ssl ) = NULL; +int (*mbedtls_ssl_hw_record_finish)( mbedtls_ssl_context *ssl ) = NULL; +#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ + +/* + * Key material generation + */ +#if defined(MBEDTLS_SSL_PROTO_SSL3) +static int ssl3_prf( const unsigned char *secret, size_t slen, + const char *label, + const unsigned char *random, size_t rlen, + unsigned char *dstbuf, size_t dlen ) +{ + int ret = 0; + size_t i; + mbedtls_md5_context md5; + mbedtls_sha1_context sha1; + unsigned char padding[16]; + unsigned char sha1sum[20]; + ((void)label); + + mbedtls_md5_init( &md5 ); + mbedtls_sha1_init( &sha1 ); + + /* + * SSLv3: + * block = + * MD5( secret + SHA1( 'A' + secret + random ) ) + + * MD5( secret + SHA1( 'BB' + secret + random ) ) + + * MD5( secret + SHA1( 'CCC' + secret + random ) ) + + * ... + */ + for( i = 0; i < dlen / 16; i++ ) + { + memset( padding, (unsigned char) ('A' + i), 1 + i ); + + if( ( ret = mbedtls_sha1_starts_ret( &sha1 ) ) != 0 ) + goto exit; + if( ( ret = mbedtls_sha1_update_ret( &sha1, padding, 1 + i ) ) != 0 ) + goto exit; + if( ( ret = mbedtls_sha1_update_ret( &sha1, secret, slen ) ) != 0 ) + goto exit; + if( ( ret = mbedtls_sha1_update_ret( &sha1, random, rlen ) ) != 0 ) + goto exit; + if( ( ret = mbedtls_sha1_finish_ret( &sha1, sha1sum ) ) != 0 ) + goto exit; + + if( ( ret = mbedtls_md5_starts_ret( &md5 ) ) != 0 ) + goto exit; + if( ( ret = mbedtls_md5_update_ret( &md5, secret, slen ) ) != 0 ) + goto exit; + if( ( ret = mbedtls_md5_update_ret( &md5, sha1sum, 20 ) ) != 0 ) + goto exit; + if( ( ret = mbedtls_md5_finish_ret( &md5, dstbuf + i * 16 ) ) != 0 ) + goto exit; + } + +exit: + mbedtls_md5_free( &md5 ); + mbedtls_sha1_free( &sha1 ); + + mbedtls_zeroize( padding, sizeof( padding ) ); + mbedtls_zeroize( sha1sum, sizeof( sha1sum ) ); + + return( ret ); +} +#endif /* MBEDTLS_SSL_PROTO_SSL3 */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) +static int tls1_prf( const unsigned char *secret, size_t slen, + const char *label, + const unsigned char *random, size_t rlen, + unsigned char *dstbuf, size_t dlen ) +{ + size_t nb, hs; + size_t i, j, k; + const unsigned char *S1, *S2; + unsigned char tmp[128]; + unsigned char h_i[20]; + const mbedtls_md_info_t *md_info; + mbedtls_md_context_t md_ctx; + int ret; + + mbedtls_md_init( &md_ctx ); + + if( sizeof( tmp ) < 20 + strlen( label ) + rlen ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + hs = ( slen + 1 ) / 2; + S1 = secret; + S2 = secret + slen - hs; + + nb = strlen( label ); + memcpy( tmp + 20, label, nb ); + memcpy( tmp + 20 + nb, random, rlen ); + nb += rlen; + + /* + * First compute P_md5(secret,label+random)[0..dlen] + */ + if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_MD5 ) ) == NULL ) + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + + if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) + return( ret ); + + mbedtls_md_hmac_starts( &md_ctx, S1, hs ); + mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb ); + mbedtls_md_hmac_finish( &md_ctx, 4 + tmp ); + + for( i = 0; i < dlen; i += 16 ) + { + mbedtls_md_hmac_reset ( &md_ctx ); + mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 + nb ); + mbedtls_md_hmac_finish( &md_ctx, h_i ); + + mbedtls_md_hmac_reset ( &md_ctx ); + mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 ); + mbedtls_md_hmac_finish( &md_ctx, 4 + tmp ); + + k = ( i + 16 > dlen ) ? dlen % 16 : 16; + + for( j = 0; j < k; j++ ) + dstbuf[i + j] = h_i[j]; + } + + mbedtls_md_free( &md_ctx ); + + /* + * XOR out with P_sha1(secret,label+random)[0..dlen] + */ + if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 ) ) == NULL ) + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + + if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) + return( ret ); + + mbedtls_md_hmac_starts( &md_ctx, S2, hs ); + mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb ); + mbedtls_md_hmac_finish( &md_ctx, tmp ); + + for( i = 0; i < dlen; i += 20 ) + { + mbedtls_md_hmac_reset ( &md_ctx ); + mbedtls_md_hmac_update( &md_ctx, tmp, 20 + nb ); + mbedtls_md_hmac_finish( &md_ctx, h_i ); + + mbedtls_md_hmac_reset ( &md_ctx ); + mbedtls_md_hmac_update( &md_ctx, tmp, 20 ); + mbedtls_md_hmac_finish( &md_ctx, tmp ); + + k = ( i + 20 > dlen ) ? dlen % 20 : 20; + + for( j = 0; j < k; j++ ) + dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] ); + } + + mbedtls_md_free( &md_ctx ); + + mbedtls_zeroize( tmp, sizeof( tmp ) ); + mbedtls_zeroize( h_i, sizeof( h_i ) ); + + return( 0 ); +} +#endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +static int tls_prf_generic( mbedtls_md_type_t md_type, + const unsigned char *secret, size_t slen, + const char *label, + const unsigned char *random, size_t rlen, + unsigned char *dstbuf, size_t dlen ) +{ + size_t nb; + size_t i, j, k, md_len; + unsigned char tmp[128]; + unsigned char h_i[MBEDTLS_MD_MAX_SIZE]; + const mbedtls_md_info_t *md_info; + mbedtls_md_context_t md_ctx; + int ret; + + mbedtls_md_init( &md_ctx ); + + if( ( md_info = mbedtls_md_info_from_type( md_type ) ) == NULL ) + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + + md_len = mbedtls_md_get_size( md_info ); + + if( sizeof( tmp ) < md_len + strlen( label ) + rlen ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + nb = strlen( label ); + memcpy( tmp + md_len, label, nb ); + memcpy( tmp + md_len + nb, random, rlen ); + nb += rlen; + + /* + * Compute P_<hash>(secret, label + random)[0..dlen] + */ + if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 ) + return( ret ); + + mbedtls_md_hmac_starts( &md_ctx, secret, slen ); + mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb ); + mbedtls_md_hmac_finish( &md_ctx, tmp ); + + for( i = 0; i < dlen; i += md_len ) + { + mbedtls_md_hmac_reset ( &md_ctx ); + mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb ); + mbedtls_md_hmac_finish( &md_ctx, h_i ); + + mbedtls_md_hmac_reset ( &md_ctx ); + mbedtls_md_hmac_update( &md_ctx, tmp, md_len ); + mbedtls_md_hmac_finish( &md_ctx, tmp ); + + k = ( i + md_len > dlen ) ? dlen % md_len : md_len; + + for( j = 0; j < k; j++ ) + dstbuf[i + j] = h_i[j]; + } + + mbedtls_md_free( &md_ctx ); + + mbedtls_zeroize( tmp, sizeof( tmp ) ); + mbedtls_zeroize( h_i, sizeof( h_i ) ); + + return( 0 ); +} + +#if defined(MBEDTLS_SHA256_C) +static int tls_prf_sha256( const unsigned char *secret, size_t slen, + const char *label, + const unsigned char *random, size_t rlen, + unsigned char *dstbuf, size_t dlen ) +{ + return( tls_prf_generic( MBEDTLS_MD_SHA256, secret, slen, + label, random, rlen, dstbuf, dlen ) ); +} +#endif /* MBEDTLS_SHA256_C */ + +#if defined(MBEDTLS_SHA512_C) +static int tls_prf_sha384( const unsigned char *secret, size_t slen, + const char *label, + const unsigned char *random, size_t rlen, + unsigned char *dstbuf, size_t dlen ) +{ + return( tls_prf_generic( MBEDTLS_MD_SHA384, secret, slen, + label, random, rlen, dstbuf, dlen ) ); +} +#endif /* MBEDTLS_SHA512_C */ +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + +static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t ); + +#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_1) +static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned char *, size_t ); +#endif + +#if defined(MBEDTLS_SSL_PROTO_SSL3) +static void ssl_calc_verify_ssl( mbedtls_ssl_context *, unsigned char * ); +static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int ); +#endif + +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) +static void ssl_calc_verify_tls( mbedtls_ssl_context *, unsigned char * ); +static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int ); +#endif + +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +#if defined(MBEDTLS_SHA256_C) +static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t ); +static void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *,unsigned char * ); +static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int ); +#endif + +#if defined(MBEDTLS_SHA512_C) +static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t ); +static void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *, unsigned char * ); +static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int ); +#endif +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + +int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl ) +{ + int ret = 0; + unsigned char tmp[64]; + unsigned char keyblk[256]; + unsigned char *key1; + unsigned char *key2; + unsigned char *mac_enc; + unsigned char *mac_dec; + size_t iv_copy_len; + const mbedtls_cipher_info_t *cipher_info; + const mbedtls_md_info_t *md_info; + + mbedtls_ssl_session *session = ssl->session_negotiate; + mbedtls_ssl_transform *transform = ssl->transform_negotiate; + mbedtls_ssl_handshake_params *handshake = ssl->handshake; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) ); + + cipher_info = mbedtls_cipher_info_from_type( transform->ciphersuite_info->cipher ); + if( cipher_info == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %d not found", + transform->ciphersuite_info->cipher ) ); + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + md_info = mbedtls_md_info_from_type( transform->ciphersuite_info->mac ); + if( md_info == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %d not found", + transform->ciphersuite_info->mac ) ); + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + /* + * Set appropriate PRF function and other SSL / TLS / TLS1.2 functions + */ +#if defined(MBEDTLS_SSL_PROTO_SSL3) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) + { + handshake->tls_prf = ssl3_prf; + handshake->calc_verify = ssl_calc_verify_ssl; + handshake->calc_finished = ssl_calc_finished_ssl; + } + else +#endif +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) + if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ) + { + handshake->tls_prf = tls1_prf; + handshake->calc_verify = ssl_calc_verify_tls; + handshake->calc_finished = ssl_calc_finished_tls; + } + else +#endif +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +#if defined(MBEDTLS_SHA512_C) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 && + transform->ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) + { + handshake->tls_prf = tls_prf_sha384; + handshake->calc_verify = ssl_calc_verify_tls_sha384; + handshake->calc_finished = ssl_calc_finished_tls_sha384; + } + else +#endif +#if defined(MBEDTLS_SHA256_C) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) + { + handshake->tls_prf = tls_prf_sha256; + handshake->calc_verify = ssl_calc_verify_tls_sha256; + handshake->calc_finished = ssl_calc_finished_tls_sha256; + } + else +#endif +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + /* + * SSLv3: + * master = + * MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) + + * MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) + + * MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) ) + * + * TLSv1+: + * master = PRF( premaster, "master secret", randbytes )[0..47] + */ + if( handshake->resume == 0 ) + { + MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret", handshake->premaster, + handshake->pmslen ); + +#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) + if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED ) + { + unsigned char session_hash[48]; + size_t hash_len; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) ); + + ssl->handshake->calc_verify( ssl, session_hash ); + +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) + { +#if defined(MBEDTLS_SHA512_C) + if( ssl->transform_negotiate->ciphersuite_info->mac == + MBEDTLS_MD_SHA384 ) + { + hash_len = 48; + } + else +#endif + hash_len = 32; + } + else +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + hash_len = 36; + + MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len ); + + ret = handshake->tls_prf( handshake->premaster, handshake->pmslen, + "extended master secret", + session_hash, hash_len, + session->master, 48 ); + if( ret != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); + return( ret ); + } + + } + else +#endif + ret = handshake->tls_prf( handshake->premaster, handshake->pmslen, + "master secret", + handshake->randbytes, 64, + session->master, 48 ); + if( ret != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); + return( ret ); + } + + mbedtls_zeroize( handshake->premaster, sizeof(handshake->premaster) ); + } + else + MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) ); + + /* + * Swap the client and server random values. + */ + memcpy( tmp, handshake->randbytes, 64 ); + memcpy( handshake->randbytes, tmp + 32, 32 ); + memcpy( handshake->randbytes + 32, tmp, 32 ); + mbedtls_zeroize( tmp, sizeof( tmp ) ); + + /* + * SSLv3: + * key block = + * MD5( master + SHA1( 'A' + master + randbytes ) ) + + * MD5( master + SHA1( 'BB' + master + randbytes ) ) + + * MD5( master + SHA1( 'CCC' + master + randbytes ) ) + + * MD5( master + SHA1( 'DDDD' + master + randbytes ) ) + + * ... + * + * TLSv1: + * key block = PRF( master, "key expansion", randbytes ) + */ + ret = handshake->tls_prf( session->master, 48, "key expansion", + handshake->randbytes, 64, keyblk, 256 ); + if( ret != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret ); + return( ret ); + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s", + mbedtls_ssl_get_ciphersuite_name( session->ciphersuite ) ) ); + MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", session->master, 48 ); + MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", handshake->randbytes, 64 ); + MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 ); + + mbedtls_zeroize( handshake->randbytes, sizeof( handshake->randbytes ) ); + + /* + * Determine the appropriate key, IV and MAC length. + */ + + transform->keylen = cipher_info->key_bitlen / 8; + + if( cipher_info->mode == MBEDTLS_MODE_GCM || + cipher_info->mode == MBEDTLS_MODE_CCM ) + { + transform->maclen = 0; + + transform->ivlen = 12; + transform->fixed_ivlen = 4; + + /* Minimum length is expicit IV + tag */ + transform->minlen = transform->ivlen - transform->fixed_ivlen + + ( transform->ciphersuite_info->flags & + MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16 ); + } + else + { + /* Initialize HMAC contexts */ + if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 || + ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret ); + return( ret ); + } + + /* Get MAC length */ + transform->maclen = mbedtls_md_get_size( md_info ); + +#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) + /* + * If HMAC is to be truncated, we shall keep the leftmost bytes, + * (rfc 6066 page 13 or rfc 2104 section 4), + * so we only need to adjust the length here. + */ + if( session->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED ) + transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN; +#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ + + /* IV length */ + transform->ivlen = cipher_info->iv_size; + + /* Minimum length */ + if( cipher_info->mode == MBEDTLS_MODE_STREAM ) + transform->minlen = transform->maclen; + else + { + /* + * GenericBlockCipher: + * 1. if EtM is in use: one block plus MAC + * otherwise: * first multiple of blocklen greater than maclen + * 2. IV except for SSL3 and TLS 1.0 + */ +#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) + if( session->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED ) + { + transform->minlen = transform->maclen + + cipher_info->block_size; + } + else +#endif + { + transform->minlen = transform->maclen + + cipher_info->block_size + - transform->maclen % cipher_info->block_size; + } + +#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 || + ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_1 ) + ; /* No need to adjust minlen */ + else +#endif +#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 || + ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) + { + transform->minlen += transform->ivlen; + } + else +#endif + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + } + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d", + transform->keylen, transform->minlen, transform->ivlen, + transform->maclen ) ); + + /* + * Finally setup the cipher contexts, IVs and MAC secrets. + */ +#if defined(MBEDTLS_SSL_CLI_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) + { + key1 = keyblk + transform->maclen * 2; + key2 = keyblk + transform->maclen * 2 + transform->keylen; + + mac_enc = keyblk; + mac_dec = keyblk + transform->maclen; + + /* + * This is not used in TLS v1.1. + */ + iv_copy_len = ( transform->fixed_ivlen ) ? + transform->fixed_ivlen : transform->ivlen; + memcpy( transform->iv_enc, key2 + transform->keylen, iv_copy_len ); + memcpy( transform->iv_dec, key2 + transform->keylen + iv_copy_len, + iv_copy_len ); + } + else +#endif /* MBEDTLS_SSL_CLI_C */ +#if defined(MBEDTLS_SSL_SRV_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) + { + key1 = keyblk + transform->maclen * 2 + transform->keylen; + key2 = keyblk + transform->maclen * 2; + + mac_enc = keyblk + transform->maclen; + mac_dec = keyblk; + + /* + * This is not used in TLS v1.1. + */ + iv_copy_len = ( transform->fixed_ivlen ) ? + transform->fixed_ivlen : transform->ivlen; + memcpy( transform->iv_dec, key1 + transform->keylen, iv_copy_len ); + memcpy( transform->iv_enc, key1 + transform->keylen + iv_copy_len, + iv_copy_len ); + } + else +#endif /* MBEDTLS_SSL_SRV_C */ + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + +#if defined(MBEDTLS_SSL_PROTO_SSL3) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) + { + if( transform->maclen > sizeof transform->mac_enc ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + memcpy( transform->mac_enc, mac_enc, transform->maclen ); + memcpy( transform->mac_dec, mac_dec, transform->maclen ); + } + else +#endif /* MBEDTLS_SSL_PROTO_SSL3 */ +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_2) + if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 ) + { + mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, transform->maclen ); + mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, transform->maclen ); + } + else +#endif + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + +#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) + if( mbedtls_ssl_hw_record_init != NULL ) + { + int ret = 0; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_init()" ) ); + + if( ( ret = mbedtls_ssl_hw_record_init( ssl, key1, key2, transform->keylen, + transform->iv_enc, transform->iv_dec, + iv_copy_len, + mac_enc, mac_dec, + transform->maclen ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_init", ret ); + return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); + } + } +#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ + +#if defined(MBEDTLS_SSL_EXPORT_KEYS) + if( ssl->conf->f_export_keys != NULL ) + { + ssl->conf->f_export_keys( ssl->conf->p_export_keys, + session->master, keyblk, + transform->maclen, transform->keylen, + iv_copy_len ); + } +#endif + + if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc, + cipher_info ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret ); + return( ret ); + } + + if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec, + cipher_info ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret ); + return( ret ); + } + + if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc, key1, + cipher_info->key_bitlen, + MBEDTLS_ENCRYPT ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret ); + return( ret ); + } + + if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2, + cipher_info->key_bitlen, + MBEDTLS_DECRYPT ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret ); + return( ret ); + } + +#if defined(MBEDTLS_CIPHER_MODE_CBC) + if( cipher_info->mode == MBEDTLS_MODE_CBC ) + { + if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_enc, + MBEDTLS_PADDING_NONE ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret ); + return( ret ); + } + + if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_dec, + MBEDTLS_PADDING_NONE ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret ); + return( ret ); + } + } +#endif /* MBEDTLS_CIPHER_MODE_CBC */ + + mbedtls_zeroize( keyblk, sizeof( keyblk ) ); + +#if defined(MBEDTLS_ZLIB_SUPPORT) + // Initialize compression + // + if( session->compression == MBEDTLS_SSL_COMPRESS_DEFLATE ) + { + if( ssl->compress_buf == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) ); + ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_BUFFER_LEN ); + if( ssl->compress_buf == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", + MBEDTLS_SSL_BUFFER_LEN ) ); + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + } + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) ); + + memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) ); + memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) ); + + if( deflateInit( &transform->ctx_deflate, + Z_DEFAULT_COMPRESSION ) != Z_OK || + inflateInit( &transform->ctx_inflate ) != Z_OK ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) ); + return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED ); + } + } +#endif /* MBEDTLS_ZLIB_SUPPORT */ + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive keys" ) ); + + return( 0 ); +} + +#if defined(MBEDTLS_SSL_PROTO_SSL3) +void ssl_calc_verify_ssl( mbedtls_ssl_context *ssl, unsigned char hash[36] ) +{ + mbedtls_md5_context md5; + mbedtls_sha1_context sha1; + unsigned char pad_1[48]; + unsigned char pad_2[48]; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) ); + + mbedtls_md5_init( &md5 ); + mbedtls_sha1_init( &sha1 ); + + mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); + mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); + + memset( pad_1, 0x36, 48 ); + memset( pad_2, 0x5C, 48 ); + + mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 ); + mbedtls_md5_update_ret( &md5, pad_1, 48 ); + mbedtls_md5_finish_ret( &md5, hash ); + + mbedtls_md5_starts_ret( &md5 ); + mbedtls_md5_update_ret( &md5, ssl->session_negotiate->master, 48 ); + mbedtls_md5_update_ret( &md5, pad_2, 48 ); + mbedtls_md5_update_ret( &md5, hash, 16 ); + mbedtls_md5_finish_ret( &md5, hash ); + + mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 ); + mbedtls_sha1_update_ret( &sha1, pad_1, 40 ); + mbedtls_sha1_finish_ret( &sha1, hash + 16 ); + + mbedtls_sha1_starts_ret( &sha1 ); + mbedtls_sha1_update_ret( &sha1, ssl->session_negotiate->master, 48 ); + mbedtls_sha1_update_ret( &sha1, pad_2, 40 ); + mbedtls_sha1_update_ret( &sha1, hash + 16, 20 ); + mbedtls_sha1_finish_ret( &sha1, hash + 16 ); + + MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 ); + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); + + mbedtls_md5_free( &md5 ); + mbedtls_sha1_free( &sha1 ); + + return; +} +#endif /* MBEDTLS_SSL_PROTO_SSL3 */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) +void ssl_calc_verify_tls( mbedtls_ssl_context *ssl, unsigned char hash[36] ) +{ + mbedtls_md5_context md5; + mbedtls_sha1_context sha1; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) ); + + mbedtls_md5_init( &md5 ); + mbedtls_sha1_init( &sha1 ); + + mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); + mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); + + mbedtls_md5_finish_ret( &md5, hash ); + mbedtls_sha1_finish_ret( &sha1, hash + 16 ); + + MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 ); + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); + + mbedtls_md5_free( &md5 ); + mbedtls_sha1_free( &sha1 ); + + return; +} +#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +#if defined(MBEDTLS_SHA256_C) +void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *ssl, unsigned char hash[32] ) +{ + mbedtls_sha256_context sha256; + + mbedtls_sha256_init( &sha256 ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) ); + + mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 ); + mbedtls_sha256_finish_ret( &sha256, hash ); + + MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 ); + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); + + mbedtls_sha256_free( &sha256 ); + + return; +} +#endif /* MBEDTLS_SHA256_C */ + +#if defined(MBEDTLS_SHA512_C) +void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *ssl, unsigned char hash[48] ) +{ + mbedtls_sha512_context sha512; + + mbedtls_sha512_init( &sha512 ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) ); + + mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 ); + mbedtls_sha512_finish_ret( &sha512, hash ); + + MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 ); + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); + + mbedtls_sha512_free( &sha512 ); + + return; +} +#endif /* MBEDTLS_SHA512_C */ +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) +int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex ) +{ + unsigned char *p = ssl->handshake->premaster; + unsigned char *end = p + sizeof( ssl->handshake->premaster ); + const unsigned char *psk = ssl->conf->psk; + size_t psk_len = ssl->conf->psk_len; + + /* If the psk callback was called, use its result */ + if( ssl->handshake->psk != NULL ) + { + psk = ssl->handshake->psk; + psk_len = ssl->handshake->psk_len; + } + + /* + * PMS = struct { + * opaque other_secret<0..2^16-1>; + * opaque psk<0..2^16-1>; + * }; + * with "other_secret" depending on the particular key exchange + */ +#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) + if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK ) + { + if( end - p < 2 ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + *(p++) = (unsigned char)( psk_len >> 8 ); + *(p++) = (unsigned char)( psk_len ); + + if( end < p || (size_t)( end - p ) < psk_len ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + memset( p, 0, psk_len ); + p += psk_len; + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) + if( key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) + { + /* + * other_secret already set by the ClientKeyExchange message, + * and is 48 bytes long + */ + *p++ = 0; + *p++ = 48; + p += 48; + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) + if( key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK ) + { + int ret; + size_t len; + + /* Write length only when we know the actual value */ + if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx, + p + 2, end - ( p + 2 ), &len, + ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret ); + return( ret ); + } + *(p++) = (unsigned char)( len >> 8 ); + *(p++) = (unsigned char)( len ); + p += len; + + MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */ +#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) + if( key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ) + { + int ret; + size_t zlen; + + if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen, + p + 2, end - ( p + 2 ), + ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret ); + return( ret ); + } + + *(p++) = (unsigned char)( zlen >> 8 ); + *(p++) = (unsigned char)( zlen ); + p += zlen; + + MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z ); + } + else +#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + /* opaque psk<0..2^16-1>; */ + if( end - p < 2 ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + *(p++) = (unsigned char)( psk_len >> 8 ); + *(p++) = (unsigned char)( psk_len ); + + if( end < p || (size_t)( end - p ) < psk_len ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + memcpy( p, psk, psk_len ); + p += psk_len; + + ssl->handshake->pmslen = p - ssl->handshake->premaster; + + return( 0 ); +} +#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ + +#if defined(MBEDTLS_SSL_PROTO_SSL3) +/* + * SSLv3.0 MAC functions + */ +#define SSL_MAC_MAX_BYTES 20 /* MD-5 or SHA-1 */ +static void ssl_mac( mbedtls_md_context_t *md_ctx, + const unsigned char *secret, + const unsigned char *buf, size_t len, + const unsigned char *ctr, int type, + unsigned char out[SSL_MAC_MAX_BYTES] ) +{ + unsigned char header[11]; + unsigned char padding[48]; + int padlen; + int md_size = mbedtls_md_get_size( md_ctx->md_info ); + int md_type = mbedtls_md_get_type( md_ctx->md_info ); + + /* Only MD5 and SHA-1 supported */ + if( md_type == MBEDTLS_MD_MD5 ) + padlen = 48; + else + padlen = 40; + + memcpy( header, ctr, 8 ); + header[ 8] = (unsigned char) type; + header[ 9] = (unsigned char)( len >> 8 ); + header[10] = (unsigned char)( len ); + + memset( padding, 0x36, padlen ); + mbedtls_md_starts( md_ctx ); + mbedtls_md_update( md_ctx, secret, md_size ); + mbedtls_md_update( md_ctx, padding, padlen ); + mbedtls_md_update( md_ctx, header, 11 ); + mbedtls_md_update( md_ctx, buf, len ); + mbedtls_md_finish( md_ctx, out ); + + memset( padding, 0x5C, padlen ); + mbedtls_md_starts( md_ctx ); + mbedtls_md_update( md_ctx, secret, md_size ); + mbedtls_md_update( md_ctx, padding, padlen ); + mbedtls_md_update( md_ctx, out, md_size ); + mbedtls_md_finish( md_ctx, out ); +} +#endif /* MBEDTLS_SSL_PROTO_SSL3 */ + +#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) || \ + ( defined(MBEDTLS_CIPHER_MODE_CBC) && \ + ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) ) ) +#define SSL_SOME_MODES_USE_MAC +#endif + +/* + * Encryption/decryption functions + */ +static int ssl_encrypt_buf( mbedtls_ssl_context *ssl ) +{ + mbedtls_cipher_mode_t mode; + int auth_done = 0; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) ); + + if( ssl->session_out == NULL || ssl->transform_out == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload", + ssl->out_msg, ssl->out_msglen ); + + if( ssl->out_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "Record content %u too large, maximum %d", + (unsigned) ssl->out_msglen, + MBEDTLS_SSL_MAX_CONTENT_LEN ) ); + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + /* + * Add MAC before if needed + */ +#if defined(SSL_SOME_MODES_USE_MAC) + if( mode == MBEDTLS_MODE_STREAM || + ( mode == MBEDTLS_MODE_CBC +#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) + && ssl->session_out->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED +#endif + ) ) + { +#if defined(MBEDTLS_SSL_PROTO_SSL3) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) + { + unsigned char mac[SSL_MAC_MAX_BYTES]; + + ssl_mac( &ssl->transform_out->md_ctx_enc, + ssl->transform_out->mac_enc, + ssl->out_msg, ssl->out_msglen, + ssl->out_ctr, ssl->out_msgtype, + mac ); + + memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen ); + } + else +#endif +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_2) + if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 ) + { + unsigned char mac[MBEDTLS_SSL_MAC_ADD]; + + mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_ctr, 8 ); + mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_hdr, 3 ); + mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_len, 2 ); + mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, + ssl->out_msg, ssl->out_msglen ); + mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc, mac ); + mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc ); + + memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen ); + } + else +#endif + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac", + ssl->out_msg + ssl->out_msglen, + ssl->transform_out->maclen ); + + ssl->out_msglen += ssl->transform_out->maclen; + auth_done++; + } +#endif /* AEAD not the only option */ + + /* + * Encrypt + */ +#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) + if( mode == MBEDTLS_MODE_STREAM ) + { + int ret; + size_t olen = 0; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " + "including %d bytes of padding", + ssl->out_msglen, 0 ) ); + + if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc, + ssl->transform_out->iv_enc, + ssl->transform_out->ivlen, + ssl->out_msg, ssl->out_msglen, + ssl->out_msg, &olen ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); + return( ret ); + } + + if( ssl->out_msglen != olen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + } + else +#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */ +#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C) + if( mode == MBEDTLS_MODE_GCM || + mode == MBEDTLS_MODE_CCM ) + { + int ret; + size_t enc_msglen, olen; + unsigned char *enc_msg; + unsigned char add_data[13]; + unsigned char taglen = ssl->transform_out->ciphersuite_info->flags & + MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16; + + memcpy( add_data, ssl->out_ctr, 8 ); + add_data[8] = ssl->out_msgtype; + mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, + ssl->conf->transport, add_data + 9 ); + add_data[11] = ( ssl->out_msglen >> 8 ) & 0xFF; + add_data[12] = ssl->out_msglen & 0xFF; + + MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD", + add_data, 13 ); + + /* + * Generate IV + */ + if( ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen != 8 ) + { + /* Reminder if we ever add an AEAD mode with a different size */ + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + memcpy( ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen, + ssl->out_ctr, 8 ); + memcpy( ssl->out_iv, ssl->out_ctr, 8 ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->out_iv, + ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen ); + + /* + * Fix pointer positions and message length with added IV + */ + enc_msg = ssl->out_msg; + enc_msglen = ssl->out_msglen; + ssl->out_msglen += ssl->transform_out->ivlen - + ssl->transform_out->fixed_ivlen; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " + "including %d bytes of padding", + ssl->out_msglen, 0 ) ); + + /* + * Encrypt and authenticate + */ + if( ( ret = mbedtls_cipher_auth_encrypt( &ssl->transform_out->cipher_ctx_enc, + ssl->transform_out->iv_enc, + ssl->transform_out->ivlen, + add_data, 13, + enc_msg, enc_msglen, + enc_msg, &olen, + enc_msg + enc_msglen, taglen ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_encrypt", ret ); + return( ret ); + } + + if( olen != enc_msglen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + ssl->out_msglen += taglen; + auth_done++; + + MBEDTLS_SSL_DEBUG_BUF( 4, "after encrypt: tag", enc_msg + enc_msglen, taglen ); + } + else +#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */ +#if defined(MBEDTLS_CIPHER_MODE_CBC) && \ + ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) ) + if( mode == MBEDTLS_MODE_CBC ) + { + int ret; + unsigned char *enc_msg; + size_t enc_msglen, padlen, olen = 0, i; + + padlen = ssl->transform_out->ivlen - ( ssl->out_msglen + 1 ) % + ssl->transform_out->ivlen; + if( padlen == ssl->transform_out->ivlen ) + padlen = 0; + + for( i = 0; i <= padlen; i++ ) + ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen; + + ssl->out_msglen += padlen + 1; + + enc_msglen = ssl->out_msglen; + enc_msg = ssl->out_msg; + +#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) + /* + * Prepend per-record IV for block cipher in TLS v1.1 and up as per + * Method 1 (6.2.3.2. in RFC4346 and RFC5246) + */ + if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) + { + /* + * Generate IV + */ + ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc, + ssl->transform_out->ivlen ); + if( ret != 0 ) + return( ret ); + + memcpy( ssl->out_iv, ssl->transform_out->iv_enc, + ssl->transform_out->ivlen ); + + /* + * Fix pointer positions and message length with added IV + */ + enc_msg = ssl->out_msg; + enc_msglen = ssl->out_msglen; + ssl->out_msglen += ssl->transform_out->ivlen; + } +#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */ + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " + "including %d bytes of IV and %d bytes of padding", + ssl->out_msglen, ssl->transform_out->ivlen, + padlen + 1 ) ); + + if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc, + ssl->transform_out->iv_enc, + ssl->transform_out->ivlen, + enc_msg, enc_msglen, + enc_msg, &olen ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); + return( ret ); + } + + if( enc_msglen != olen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + +#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) + if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 ) + { + /* + * Save IV in SSL3 and TLS1 + */ + memcpy( ssl->transform_out->iv_enc, + ssl->transform_out->cipher_ctx_enc.iv, + ssl->transform_out->ivlen ); + } +#endif + +#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) + if( auth_done == 0 ) + { + /* + * MAC(MAC_write_key, seq_num + + * TLSCipherText.type + + * TLSCipherText.version + + * length_of( (IV +) ENC(...) ) + + * IV + // except for TLS 1.0 + * ENC(content + padding + padding_length)); + */ + unsigned char pseudo_hdr[13]; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) ); + + memcpy( pseudo_hdr + 0, ssl->out_ctr, 8 ); + memcpy( pseudo_hdr + 8, ssl->out_hdr, 3 ); + pseudo_hdr[11] = (unsigned char)( ( ssl->out_msglen >> 8 ) & 0xFF ); + pseudo_hdr[12] = (unsigned char)( ( ssl->out_msglen ) & 0xFF ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 ); + + mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, pseudo_hdr, 13 ); + mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, + ssl->out_iv, ssl->out_msglen ); + mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc, + ssl->out_iv + ssl->out_msglen ); + mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc ); + + ssl->out_msglen += ssl->transform_out->maclen; + auth_done++; + } +#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ + } + else +#endif /* MBEDTLS_CIPHER_MODE_CBC && + ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */ + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + /* Make extra sure authentication was performed, exactly once */ + if( auth_done != 1 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) ); + + return( 0 ); +} + +static int ssl_decrypt_buf( mbedtls_ssl_context *ssl ) +{ + size_t i; + mbedtls_cipher_mode_t mode; + int auth_done = 0; +#if defined(SSL_SOME_MODES_USE_MAC) + size_t padlen = 0, correct = 1; +#endif + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) ); + + if( ssl->session_in == NULL || ssl->transform_in == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_in->cipher_ctx_dec ); + + if( ssl->in_msglen < ssl->transform_in->minlen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)", + ssl->in_msglen, ssl->transform_in->minlen ) ); + return( MBEDTLS_ERR_SSL_INVALID_MAC ); + } + +#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) + if( mode == MBEDTLS_MODE_STREAM ) + { + int ret; + size_t olen = 0; + + padlen = 0; + + if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec, + ssl->transform_in->iv_dec, + ssl->transform_in->ivlen, + ssl->in_msg, ssl->in_msglen, + ssl->in_msg, &olen ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); + return( ret ); + } + + if( ssl->in_msglen != olen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + } + else +#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */ +#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C) + if( mode == MBEDTLS_MODE_GCM || + mode == MBEDTLS_MODE_CCM ) + { + int ret; + size_t dec_msglen, olen; + unsigned char *dec_msg; + unsigned char *dec_msg_result; + unsigned char add_data[13]; + unsigned char taglen = ssl->transform_in->ciphersuite_info->flags & + MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16; + size_t explicit_iv_len = ssl->transform_in->ivlen - + ssl->transform_in->fixed_ivlen; + + if( ssl->in_msglen < explicit_iv_len + taglen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) " + "+ taglen (%d)", ssl->in_msglen, + explicit_iv_len, taglen ) ); + return( MBEDTLS_ERR_SSL_INVALID_MAC ); + } + dec_msglen = ssl->in_msglen - explicit_iv_len - taglen; + + dec_msg = ssl->in_msg; + dec_msg_result = ssl->in_msg; + ssl->in_msglen = dec_msglen; + + memcpy( add_data, ssl->in_ctr, 8 ); + add_data[8] = ssl->in_msgtype; + mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, + ssl->conf->transport, add_data + 9 ); + add_data[11] = ( ssl->in_msglen >> 8 ) & 0xFF; + add_data[12] = ssl->in_msglen & 0xFF; + + MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD", + add_data, 13 ); + + memcpy( ssl->transform_in->iv_dec + ssl->transform_in->fixed_ivlen, + ssl->in_iv, + ssl->transform_in->ivlen - ssl->transform_in->fixed_ivlen ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->transform_in->iv_dec, + ssl->transform_in->ivlen ); + MBEDTLS_SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, taglen ); + + /* + * Decrypt and authenticate + */ + if( ( ret = mbedtls_cipher_auth_decrypt( &ssl->transform_in->cipher_ctx_dec, + ssl->transform_in->iv_dec, + ssl->transform_in->ivlen, + add_data, 13, + dec_msg, dec_msglen, + dec_msg_result, &olen, + dec_msg + dec_msglen, taglen ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_decrypt", ret ); + + if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED ) + return( MBEDTLS_ERR_SSL_INVALID_MAC ); + + return( ret ); + } + auth_done++; + + if( olen != dec_msglen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + } + else +#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */ +#if defined(MBEDTLS_CIPHER_MODE_CBC) && \ + ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) ) + if( mode == MBEDTLS_MODE_CBC ) + { + /* + * Decrypt and check the padding + */ + int ret; + unsigned char *dec_msg; + unsigned char *dec_msg_result; + size_t dec_msglen; + size_t minlen = 0; + size_t olen = 0; + + /* + * Check immediate ciphertext sanity + */ +#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) + if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) + minlen += ssl->transform_in->ivlen; +#endif + + if( ssl->in_msglen < minlen + ssl->transform_in->ivlen || + ssl->in_msglen < minlen + ssl->transform_in->maclen + 1 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < max( ivlen(%d), maclen (%d) " + "+ 1 ) ( + expl IV )", ssl->in_msglen, + ssl->transform_in->ivlen, + ssl->transform_in->maclen ) ); + return( MBEDTLS_ERR_SSL_INVALID_MAC ); + } + + dec_msglen = ssl->in_msglen; + dec_msg = ssl->in_msg; + dec_msg_result = ssl->in_msg; + + /* + * Authenticate before decrypt if enabled + */ +#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) + if( ssl->session_in->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED ) + { + unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD]; + unsigned char pseudo_hdr[13]; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) ); + + dec_msglen -= ssl->transform_in->maclen; + ssl->in_msglen -= ssl->transform_in->maclen; + + memcpy( pseudo_hdr + 0, ssl->in_ctr, 8 ); + memcpy( pseudo_hdr + 8, ssl->in_hdr, 3 ); + pseudo_hdr[11] = (unsigned char)( ( ssl->in_msglen >> 8 ) & 0xFF ); + pseudo_hdr[12] = (unsigned char)( ( ssl->in_msglen ) & 0xFF ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 ); + + mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, pseudo_hdr, 13 ); + mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, + ssl->in_iv, ssl->in_msglen ); + mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect ); + mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_iv + ssl->in_msglen, + ssl->transform_in->maclen ); + MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect, + ssl->transform_in->maclen ); + + if( mbedtls_ssl_safer_memcmp( ssl->in_iv + ssl->in_msglen, mac_expect, + ssl->transform_in->maclen ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) ); + + return( MBEDTLS_ERR_SSL_INVALID_MAC ); + } + auth_done++; + } +#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */ + + /* + * Check length sanity + */ + if( ssl->in_msglen % ssl->transform_in->ivlen != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0", + ssl->in_msglen, ssl->transform_in->ivlen ) ); + return( MBEDTLS_ERR_SSL_INVALID_MAC ); + } + +#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2) + /* + * Initialize for prepended IV for block cipher in TLS v1.1 and up + */ + if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) + { + dec_msglen -= ssl->transform_in->ivlen; + ssl->in_msglen -= ssl->transform_in->ivlen; + + for( i = 0; i < ssl->transform_in->ivlen; i++ ) + ssl->transform_in->iv_dec[i] = ssl->in_iv[i]; + } +#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */ + + if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec, + ssl->transform_in->iv_dec, + ssl->transform_in->ivlen, + dec_msg, dec_msglen, + dec_msg_result, &olen ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret ); + return( ret ); + } + + if( dec_msglen != olen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + +#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) + if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 ) + { + /* + * Save IV in SSL3 and TLS1 + */ + memcpy( ssl->transform_in->iv_dec, + ssl->transform_in->cipher_ctx_dec.iv, + ssl->transform_in->ivlen ); + } +#endif + + padlen = 1 + ssl->in_msg[ssl->in_msglen - 1]; + + if( ssl->in_msglen < ssl->transform_in->maclen + padlen && + auth_done == 0 ) + { +#if defined(MBEDTLS_SSL_DEBUG_ALL) + MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)", + ssl->in_msglen, ssl->transform_in->maclen, padlen ) ); +#endif + padlen = 0; + correct = 0; + } + +#if defined(MBEDTLS_SSL_PROTO_SSL3) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) + { + if( padlen > ssl->transform_in->ivlen ) + { +#if defined(MBEDTLS_SSL_DEBUG_ALL) + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, " + "should be no more than %d", + padlen, ssl->transform_in->ivlen ) ); +#endif + correct = 0; + } + } + else +#endif /* MBEDTLS_SSL_PROTO_SSL3 */ +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_2) + if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 ) + { + /* + * TLSv1+: always check the padding up to the first failure + * and fake check up to 256 bytes of padding + */ + size_t pad_count = 0, real_count = 1; + size_t padding_idx = ssl->in_msglen - padlen - 1; + + /* + * Padding is guaranteed to be incorrect if: + * 1. padlen >= ssl->in_msglen + * + * 2. padding_idx >= MBEDTLS_SSL_MAX_CONTENT_LEN + + * ssl->transform_in->maclen + * + * In both cases we reset padding_idx to a safe value (0) to + * prevent out-of-buffer reads. + */ + correct &= ( ssl->in_msglen >= padlen + 1 ); + correct &= ( padding_idx < MBEDTLS_SSL_MAX_CONTENT_LEN + + ssl->transform_in->maclen ); + + padding_idx *= correct; + + for( i = 1; i <= 256; i++ ) + { + real_count &= ( i <= padlen ); + pad_count += real_count * + ( ssl->in_msg[padding_idx + i] == padlen - 1 ); + } + + correct &= ( pad_count == padlen ); /* Only 1 on correct padding */ + +#if defined(MBEDTLS_SSL_DEBUG_ALL) + if( padlen > 0 && correct == 0 ) + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) ); +#endif + padlen &= correct * 0x1FF; + } + else +#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ + MBEDTLS_SSL_PROTO_TLS1_2 */ + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + ssl->in_msglen -= padlen; + } + else +#endif /* MBEDTLS_CIPHER_MODE_CBC && + ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */ + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + MBEDTLS_SSL_DEBUG_BUF( 4, "raw buffer after decryption", + ssl->in_msg, ssl->in_msglen ); + + /* + * Authenticate if not done yet. + * Compute the MAC regardless of the padding result (RFC4346, CBCTIME). + */ +#if defined(SSL_SOME_MODES_USE_MAC) + if( auth_done == 0 ) + { + unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD]; + + ssl->in_msglen -= ssl->transform_in->maclen; + + ssl->in_len[0] = (unsigned char)( ssl->in_msglen >> 8 ); + ssl->in_len[1] = (unsigned char)( ssl->in_msglen ); + +#if defined(MBEDTLS_SSL_PROTO_SSL3) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) + { + ssl_mac( &ssl->transform_in->md_ctx_dec, + ssl->transform_in->mac_dec, + ssl->in_msg, ssl->in_msglen, + ssl->in_ctr, ssl->in_msgtype, + mac_expect ); + } + else +#endif /* MBEDTLS_SSL_PROTO_SSL3 */ +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_2) + if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 ) + { + /* + * Process MAC and always update for padlen afterwards to make + * total time independent of padlen + * + * extra_run compensates MAC check for padlen + * + * Known timing attacks: + * - Lucky Thirteen (http://www.isg.rhul.ac.uk/tls/TLStiming.pdf) + * + * We use ( ( Lx + 8 ) / 64 ) to handle 'negative Lx' values + * correctly. (We round down instead of up, so -56 is the correct + * value for our calculations instead of -55) + */ + size_t j, extra_run = 0; + extra_run = ( 13 + ssl->in_msglen + padlen + 8 ) / 64 - + ( 13 + ssl->in_msglen + 8 ) / 64; + + extra_run &= correct * 0xFF; + + mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_ctr, 8 ); + mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_hdr, 3 ); + mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_len, 2 ); + mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_msg, + ssl->in_msglen ); + mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect ); + /* Call mbedtls_md_process at least once due to cache attacks */ + for( j = 0; j < extra_run + 1; j++ ) + mbedtls_md_process( &ssl->transform_in->md_ctx_dec, ssl->in_msg ); + + mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec ); + } + else +#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ + MBEDTLS_SSL_PROTO_TLS1_2 */ + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect, ssl->transform_in->maclen ); + MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_msg + ssl->in_msglen, + ssl->transform_in->maclen ); + + if( mbedtls_ssl_safer_memcmp( ssl->in_msg + ssl->in_msglen, mac_expect, + ssl->transform_in->maclen ) != 0 ) + { +#if defined(MBEDTLS_SSL_DEBUG_ALL) + MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) ); +#endif + correct = 0; + } + auth_done++; + + /* + * Finally check the correct flag + */ + if( correct == 0 ) + return( MBEDTLS_ERR_SSL_INVALID_MAC ); + } +#endif /* SSL_SOME_MODES_USE_MAC */ + + /* Make extra sure authentication was performed, exactly once */ + if( auth_done != 1 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + if( ssl->in_msglen == 0 ) + { + ssl->nb_zero++; + + /* + * Three or more empty messages may be a DoS attack + * (excessive CPU consumption). + */ + if( ssl->nb_zero > 3 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "received four consecutive empty " + "messages, possible DoS attack" ) ); + return( MBEDTLS_ERR_SSL_INVALID_MAC ); + } + } + else + ssl->nb_zero = 0; + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + ; /* in_ctr read from peer, not maintained internally */ + } + else +#endif + { + for( i = 8; i > ssl_ep_len( ssl ); i-- ) + if( ++ssl->in_ctr[i - 1] != 0 ) + break; + + /* The loop goes to its end iff the counter is wrapping */ + if( i == ssl_ep_len( ssl ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) ); + return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); + } + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) ); + + return( 0 ); +} + +#undef MAC_NONE +#undef MAC_PLAINTEXT +#undef MAC_CIPHERTEXT + +#if defined(MBEDTLS_ZLIB_SUPPORT) +/* + * Compression/decompression functions + */ +static int ssl_compress_buf( mbedtls_ssl_context *ssl ) +{ + int ret; + unsigned char *msg_post = ssl->out_msg; + size_t len_pre = ssl->out_msglen; + unsigned char *msg_pre = ssl->compress_buf; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> compress buf" ) ); + + if( len_pre == 0 ) + return( 0 ); + + memcpy( msg_pre, ssl->out_msg, len_pre ); + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ", + ssl->out_msglen ) ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "before compression: output payload", + ssl->out_msg, ssl->out_msglen ); + + ssl->transform_out->ctx_deflate.next_in = msg_pre; + ssl->transform_out->ctx_deflate.avail_in = len_pre; + ssl->transform_out->ctx_deflate.next_out = msg_post; + ssl->transform_out->ctx_deflate.avail_out = MBEDTLS_SSL_BUFFER_LEN; + + ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH ); + if( ret != Z_OK ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform compression (%d)", ret ) ); + return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED ); + } + + ssl->out_msglen = MBEDTLS_SSL_BUFFER_LEN - + ssl->transform_out->ctx_deflate.avail_out; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ", + ssl->out_msglen ) ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "after compression: output payload", + ssl->out_msg, ssl->out_msglen ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= compress buf" ) ); + + return( 0 ); +} + +static int ssl_decompress_buf( mbedtls_ssl_context *ssl ) +{ + int ret; + unsigned char *msg_post = ssl->in_msg; + size_t len_pre = ssl->in_msglen; + unsigned char *msg_pre = ssl->compress_buf; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) ); + + if( len_pre == 0 ) + return( 0 ); + + memcpy( msg_pre, ssl->in_msg, len_pre ); + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ", + ssl->in_msglen ) ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "before decompression: input payload", + ssl->in_msg, ssl->in_msglen ); + + ssl->transform_in->ctx_inflate.next_in = msg_pre; + ssl->transform_in->ctx_inflate.avail_in = len_pre; + ssl->transform_in->ctx_inflate.next_out = msg_post; + ssl->transform_in->ctx_inflate.avail_out = MBEDTLS_SSL_MAX_CONTENT_LEN; + + ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH ); + if( ret != Z_OK ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform decompression (%d)", ret ) ); + return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED ); + } + + ssl->in_msglen = MBEDTLS_SSL_MAX_CONTENT_LEN - + ssl->transform_in->ctx_inflate.avail_out; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ", + ssl->in_msglen ) ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "after decompression: input payload", + ssl->in_msg, ssl->in_msglen ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decompress buf" ) ); + + return( 0 ); +} +#endif /* MBEDTLS_ZLIB_SUPPORT */ + +#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) +static int ssl_write_hello_request( mbedtls_ssl_context *ssl ); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) +static int ssl_resend_hello_request( mbedtls_ssl_context *ssl ) +{ + /* If renegotiation is not enforced, retransmit until we would reach max + * timeout if we were using the usual handshake doubling scheme */ + if( ssl->conf->renego_max_records < 0 ) + { + uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1; + unsigned char doublings = 1; + + while( ratio != 0 ) + { + ++doublings; + ratio >>= 1; + } + + if( ++ssl->renego_records_seen > doublings ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "no longer retransmitting hello request" ) ); + return( 0 ); + } + } + + return( ssl_write_hello_request( ssl ) ); +} +#endif +#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ + +/* + * Fill the input message buffer by appending data to it. + * The amount of data already fetched is in ssl->in_left. + * + * If we return 0, is it guaranteed that (at least) nb_want bytes are + * available (from this read and/or a previous one). Otherwise, an error code + * is returned (possibly EOF or WANT_READ). + * + * With stream transport (TLS) on success ssl->in_left == nb_want, but + * with datagram transport (DTLS) on success ssl->in_left >= nb_want, + * since we always read a whole datagram at once. + * + * For DTLS, it is up to the caller to set ssl->next_record_offset when + * they're done reading a record. + */ +int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want ) +{ + int ret; + size_t len; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> fetch input" ) ); + + if( ssl->f_recv == NULL && ssl->f_recv_timeout == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() " + "or mbedtls_ssl_set_bio()" ) ); + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + if( nb_want > MBEDTLS_SSL_BUFFER_LEN - (size_t)( ssl->in_hdr - ssl->in_buf ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) ); + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + uint32_t timeout; + + /* Just to be sure */ + if( ssl->f_set_timer == NULL || ssl->f_get_timer == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "You must use " + "mbedtls_ssl_set_timer_cb() for DTLS" ) ); + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + /* + * The point is, we need to always read a full datagram at once, so we + * sometimes read more then requested, and handle the additional data. + * It could be the rest of the current record (while fetching the + * header) and/or some other records in the same datagram. + */ + + /* + * Move to the next record in the already read datagram if applicable + */ + if( ssl->next_record_offset != 0 ) + { + if( ssl->in_left < ssl->next_record_offset ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + ssl->in_left -= ssl->next_record_offset; + + if( ssl->in_left != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "next record in same datagram, offset: %d", + ssl->next_record_offset ) ); + memmove( ssl->in_hdr, + ssl->in_hdr + ssl->next_record_offset, + ssl->in_left ); + } + + ssl->next_record_offset = 0; + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d", + ssl->in_left, nb_want ) ); + + /* + * Done if we already have enough data. + */ + if( nb_want <= ssl->in_left) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) ); + return( 0 ); + } + + /* + * A record can't be split accross datagrams. If we need to read but + * are not at the beginning of a new record, the caller did something + * wrong. + */ + if( ssl->in_left != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + /* + * Don't even try to read if time's out already. + * This avoids by-passing the timer when repeatedly receiving messages + * that will end up being dropped. + */ + if( ssl_check_timer( ssl ) != 0 ) + ret = MBEDTLS_ERR_SSL_TIMEOUT; + else + { + len = MBEDTLS_SSL_BUFFER_LEN - ( ssl->in_hdr - ssl->in_buf ); + + if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) + timeout = ssl->handshake->retransmit_timeout; + else + timeout = ssl->conf->read_timeout; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "f_recv_timeout: %u ms", timeout ) ); + + if( ssl->f_recv_timeout != NULL ) + ret = ssl->f_recv_timeout( ssl->p_bio, ssl->in_hdr, len, + timeout ); + else + ret = ssl->f_recv( ssl->p_bio, ssl->in_hdr, len ); + + MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret ); + + if( ret == 0 ) + return( MBEDTLS_ERR_SSL_CONN_EOF ); + } + + if( ret == MBEDTLS_ERR_SSL_TIMEOUT ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "timeout" ) ); + ssl_set_timer( ssl, 0 ); + + if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) + { + if( ssl_double_retransmit_timeout( ssl ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake timeout" ) ); + return( MBEDTLS_ERR_SSL_TIMEOUT ); + } + + if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret ); + return( ret ); + } + + return( MBEDTLS_ERR_SSL_WANT_READ ); + } +#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) + else if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && + ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) + { + if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret ); + return( ret ); + } + + return( MBEDTLS_ERR_SSL_WANT_READ ); + } +#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ + } + + if( ret < 0 ) + return( ret ); + + ssl->in_left = ret; + } + else +#endif + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d", + ssl->in_left, nb_want ) ); + + while( ssl->in_left < nb_want ) + { + len = nb_want - ssl->in_left; + + if( ssl_check_timer( ssl ) != 0 ) + ret = MBEDTLS_ERR_SSL_TIMEOUT; + else + { + if( ssl->f_recv_timeout != NULL ) + { + ret = ssl->f_recv_timeout( ssl->p_bio, + ssl->in_hdr + ssl->in_left, len, + ssl->conf->read_timeout ); + } + else + { + ret = ssl->f_recv( ssl->p_bio, + ssl->in_hdr + ssl->in_left, len ); + } + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d", + ssl->in_left, nb_want ) ); + MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret ); + + if( ret == 0 ) + return( MBEDTLS_ERR_SSL_CONN_EOF ); + + if( ret < 0 ) + return( ret ); + + ssl->in_left += ret; + } + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) ); + + return( 0 ); +} + +/* + * Flush any data not yet written + */ +int mbedtls_ssl_flush_output( mbedtls_ssl_context *ssl ) +{ + int ret; + unsigned char *buf, i; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> flush output" ) ); + + if( ssl->f_send == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() " + "or mbedtls_ssl_set_bio()" ) ); + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + /* Avoid incrementing counter if data is flushed */ + if( ssl->out_left == 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) ); + return( 0 ); + } + + while( ssl->out_left > 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d", + mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen, ssl->out_left ) ); + + buf = ssl->out_hdr + mbedtls_ssl_hdr_len( ssl ) + + ssl->out_msglen - ssl->out_left; + ret = ssl->f_send( ssl->p_bio, buf, ssl->out_left ); + + MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_send", ret ); + + if( ret <= 0 ) + return( ret ); + + ssl->out_left -= ret; + } + + for( i = 8; i > ssl_ep_len( ssl ); i-- ) + if( ++ssl->out_ctr[i - 1] != 0 ) + break; + + /* The loop goes to its end iff the counter is wrapping */ + if( i == ssl_ep_len( ssl ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) ); + return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) ); + + return( 0 ); +} + +/* + * Functions to handle the DTLS retransmission state machine + */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) +/* + * Append current handshake message to current outgoing flight + */ +static int ssl_flight_append( mbedtls_ssl_context *ssl ) +{ + mbedtls_ssl_flight_item *msg; + + /* Allocate space for current message */ + if( ( msg = mbedtls_calloc( 1, sizeof( mbedtls_ssl_flight_item ) ) ) == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", + sizeof( mbedtls_ssl_flight_item ) ) ); + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + } + + if( ( msg->p = mbedtls_calloc( 1, ssl->out_msglen ) ) == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", ssl->out_msglen ) ); + mbedtls_free( msg ); + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + } + + /* Copy current handshake message with headers */ + memcpy( msg->p, ssl->out_msg, ssl->out_msglen ); + msg->len = ssl->out_msglen; + msg->type = ssl->out_msgtype; + msg->next = NULL; + + /* Append to the current flight */ + if( ssl->handshake->flight == NULL ) + ssl->handshake->flight = msg; + else + { + mbedtls_ssl_flight_item *cur = ssl->handshake->flight; + while( cur->next != NULL ) + cur = cur->next; + cur->next = msg; + } + + return( 0 ); +} + +/* + * Free the current flight of handshake messages + */ +static void ssl_flight_free( mbedtls_ssl_flight_item *flight ) +{ + mbedtls_ssl_flight_item *cur = flight; + mbedtls_ssl_flight_item *next; + + while( cur != NULL ) + { + next = cur->next; + + mbedtls_free( cur->p ); + mbedtls_free( cur ); + + cur = next; + } +} + +#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) +static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl ); +#endif + +/* + * Swap transform_out and out_ctr with the alternative ones + */ +static void ssl_swap_epochs( mbedtls_ssl_context *ssl ) +{ + mbedtls_ssl_transform *tmp_transform; + unsigned char tmp_out_ctr[8]; + + if( ssl->transform_out == ssl->handshake->alt_transform_out ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip swap epochs" ) ); + return; + } + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "swap epochs" ) ); + + /* Swap transforms */ + tmp_transform = ssl->transform_out; + ssl->transform_out = ssl->handshake->alt_transform_out; + ssl->handshake->alt_transform_out = tmp_transform; + + /* Swap epoch + sequence_number */ + memcpy( tmp_out_ctr, ssl->out_ctr, 8 ); + memcpy( ssl->out_ctr, ssl->handshake->alt_out_ctr, 8 ); + memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr, 8 ); + + /* Adjust to the newly activated transform */ + if( ssl->transform_out != NULL && + ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) + { + ssl->out_msg = ssl->out_iv + ssl->transform_out->ivlen - + ssl->transform_out->fixed_ivlen; + } + else + ssl->out_msg = ssl->out_iv; + +#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) + if( mbedtls_ssl_hw_record_activate != NULL ) + { + if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret ); + return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); + } + } +#endif +} + +/* + * Retransmit the current flight of messages. + * + * Need to remember the current message in case flush_output returns + * WANT_WRITE, causing us to exit this function and come back later. + * This function must be called until state is no longer SENDING. + */ +int mbedtls_ssl_resend( mbedtls_ssl_context *ssl ) +{ + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_resend" ) ); + + if( ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialise resending" ) ); + + ssl->handshake->cur_msg = ssl->handshake->flight; + ssl_swap_epochs( ssl ); + + ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_SENDING; + } + + while( ssl->handshake->cur_msg != NULL ) + { + int ret; + mbedtls_ssl_flight_item *cur = ssl->handshake->cur_msg; + + /* Swap epochs before sending Finished: we can't do it after + * sending ChangeCipherSpec, in case write returns WANT_READ. + * Must be done before copying, may change out_msg pointer */ + if( cur->type == MBEDTLS_SSL_MSG_HANDSHAKE && + cur->p[0] == MBEDTLS_SSL_HS_FINISHED ) + { + ssl_swap_epochs( ssl ); + } + + memcpy( ssl->out_msg, cur->p, cur->len ); + ssl->out_msglen = cur->len; + ssl->out_msgtype = cur->type; + + ssl->handshake->cur_msg = cur->next; + + MBEDTLS_SSL_DEBUG_BUF( 3, "resent handshake message header", ssl->out_msg, 12 ); + + if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); + return( ret ); + } + } + + if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) + ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED; + else + { + ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; + ssl_set_timer( ssl, ssl->handshake->retransmit_timeout ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_resend" ) ); + + return( 0 ); +} + +/* + * To be called when the last message of an incoming flight is received. + */ +void mbedtls_ssl_recv_flight_completed( mbedtls_ssl_context *ssl ) +{ + /* We won't need to resend that one any more */ + ssl_flight_free( ssl->handshake->flight ); + ssl->handshake->flight = NULL; + ssl->handshake->cur_msg = NULL; + + /* The next incoming flight will start with this msg_seq */ + ssl->handshake->in_flight_start_seq = ssl->handshake->in_msg_seq; + + /* Cancel timer */ + ssl_set_timer( ssl, 0 ); + + if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && + ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED ) + { + ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED; + } + else + ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING; +} + +/* + * To be called when the last message of an outgoing flight is send. + */ +void mbedtls_ssl_send_flight_completed( mbedtls_ssl_context *ssl ) +{ + ssl_reset_retransmit_timeout( ssl ); + ssl_set_timer( ssl, ssl->handshake->retransmit_timeout ); + + if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && + ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED ) + { + ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED; + } + else + ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; +} +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + +/* + * Record layer functions + */ + +/* + * Write current record. + * Uses ssl->out_msgtype, ssl->out_msglen and bytes at ssl->out_msg. + */ +int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl ) +{ + int ret, done = 0, out_msg_type; + size_t len = ssl->out_msglen; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write record" ) ); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ssl->handshake != NULL && + ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) + { + ; /* Skip special handshake treatment when resending */ + } + else +#endif + if( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) + { + out_msg_type = ssl->out_msg[0]; + + if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST && + ssl->handshake == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + ssl->out_msg[1] = (unsigned char)( ( len - 4 ) >> 16 ); + ssl->out_msg[2] = (unsigned char)( ( len - 4 ) >> 8 ); + ssl->out_msg[3] = (unsigned char)( ( len - 4 ) ); + + /* + * DTLS has additional fields in the Handshake layer, + * between the length field and the actual payload: + * uint16 message_seq; + * uint24 fragment_offset; + * uint24 fragment_length; + */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + /* Make room for the additional DTLS fields */ + if( MBEDTLS_SSL_MAX_CONTENT_LEN - ssl->out_msglen < 8 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS handshake message too large: " + "size %u, maximum %u", + (unsigned) ( ssl->in_hslen - 4 ), + (unsigned) ( MBEDTLS_SSL_MAX_CONTENT_LEN - 12 ) ) ); + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + memmove( ssl->out_msg + 12, ssl->out_msg + 4, len - 4 ); + ssl->out_msglen += 8; + len += 8; + + /* Write message_seq and update it, except for HelloRequest */ + if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST ) + { + ssl->out_msg[4] = ( ssl->handshake->out_msg_seq >> 8 ) & 0xFF; + ssl->out_msg[5] = ( ssl->handshake->out_msg_seq ) & 0xFF; + ++( ssl->handshake->out_msg_seq ); + } + else + { + ssl->out_msg[4] = 0; + ssl->out_msg[5] = 0; + } + + /* We don't fragment, so frag_offset = 0 and frag_len = len */ + memset( ssl->out_msg + 6, 0x00, 3 ); + memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 ); + } +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + + if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST ) + ssl->handshake->update_checksum( ssl, ssl->out_msg, len ); + } + + /* Save handshake and CCS messages for resending */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ssl->handshake != NULL && + ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING && + ( ssl->out_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC || + ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) ) + { + if( ( ret = ssl_flight_append( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_flight_append", ret ); + return( ret ); + } + } +#endif + +#if defined(MBEDTLS_ZLIB_SUPPORT) + if( ssl->transform_out != NULL && + ssl->session_out->compression == MBEDTLS_SSL_COMPRESS_DEFLATE ) + { + if( ( ret = ssl_compress_buf( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compress_buf", ret ); + return( ret ); + } + + len = ssl->out_msglen; + } +#endif /*MBEDTLS_ZLIB_SUPPORT */ + +#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) + if( mbedtls_ssl_hw_record_write != NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_write()" ) ); + + ret = mbedtls_ssl_hw_record_write( ssl ); + if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_write", ret ); + return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); + } + + if( ret == 0 ) + done = 1; + } +#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ + if( !done ) + { + ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype; + mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver, + ssl->conf->transport, ssl->out_hdr + 1 ); + + ssl->out_len[0] = (unsigned char)( len >> 8 ); + ssl->out_len[1] = (unsigned char)( len ); + + if( ssl->transform_out != NULL ) + { + if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret ); + return( ret ); + } + + len = ssl->out_msglen; + ssl->out_len[0] = (unsigned char)( len >> 8 ); + ssl->out_len[1] = (unsigned char)( len ); + } + + ssl->out_left = mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, " + "version = [%d:%d], msglen = %d", + ssl->out_hdr[0], ssl->out_hdr[1], ssl->out_hdr[2], + ( ssl->out_len[0] << 8 ) | ssl->out_len[1] ) ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "output record sent to network", + ssl->out_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen ); + } + + if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret ); + return( ret ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write record" ) ); + + return( 0 ); +} + +#if defined(MBEDTLS_SSL_PROTO_DTLS) +/* + * Mark bits in bitmask (used for DTLS HS reassembly) + */ +static void ssl_bitmask_set( unsigned char *mask, size_t offset, size_t len ) +{ + unsigned int start_bits, end_bits; + + start_bits = 8 - ( offset % 8 ); + if( start_bits != 8 ) + { + size_t first_byte_idx = offset / 8; + + /* Special case */ + if( len <= start_bits ) + { + for( ; len != 0; len-- ) + mask[first_byte_idx] |= 1 << ( start_bits - len ); + + /* Avoid potential issues with offset or len becoming invalid */ + return; + } + + offset += start_bits; /* Now offset % 8 == 0 */ + len -= start_bits; + + for( ; start_bits != 0; start_bits-- ) + mask[first_byte_idx] |= 1 << ( start_bits - 1 ); + } + + end_bits = len % 8; + if( end_bits != 0 ) + { + size_t last_byte_idx = ( offset + len ) / 8; + + len -= end_bits; /* Now len % 8 == 0 */ + + for( ; end_bits != 0; end_bits-- ) + mask[last_byte_idx] |= 1 << ( 8 - end_bits ); + } + + memset( mask + offset / 8, 0xFF, len / 8 ); +} + +/* + * Check that bitmask is full + */ +static int ssl_bitmask_check( unsigned char *mask, size_t len ) +{ + size_t i; + + for( i = 0; i < len / 8; i++ ) + if( mask[i] != 0xFF ) + return( -1 ); + + for( i = 0; i < len % 8; i++ ) + if( ( mask[len / 8] & ( 1 << ( 7 - i ) ) ) == 0 ) + return( -1 ); + + return( 0 ); +} + +/* + * Reassemble fragmented DTLS handshake messages. + * + * Use a temporary buffer for reassembly, divided in two parts: + * - the first holds the reassembled message (including handshake header), + * - the second holds a bitmask indicating which parts of the message + * (excluding headers) have been received so far. + */ +static int ssl_reassemble_dtls_handshake( mbedtls_ssl_context *ssl ) +{ + unsigned char *msg, *bitmask; + size_t frag_len, frag_off; + size_t msg_len = ssl->in_hslen - 12; /* Without headers */ + + if( ssl->handshake == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "not supported outside handshake (for now)" ) ); + return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); + } + + /* + * For first fragment, check size and allocate buffer + */ + if( ssl->handshake->hs_msg == NULL ) + { + size_t alloc_len; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialize reassembly, total length = %d", + msg_len ) ); + + if( ssl->in_hslen > MBEDTLS_SSL_MAX_CONTENT_LEN ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too large" ) ); + return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); + } + + /* The bitmask needs one bit per byte of message excluding header */ + alloc_len = 12 + msg_len + msg_len / 8 + ( msg_len % 8 != 0 ); + + ssl->handshake->hs_msg = mbedtls_calloc( 1, alloc_len ); + if( ssl->handshake->hs_msg == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", alloc_len ) ); + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + } + + /* Prepare final header: copy msg_type, length and message_seq, + * then add standardised fragment_offset and fragment_length */ + memcpy( ssl->handshake->hs_msg, ssl->in_msg, 6 ); + memset( ssl->handshake->hs_msg + 6, 0, 3 ); + memcpy( ssl->handshake->hs_msg + 9, + ssl->handshake->hs_msg + 1, 3 ); + } + else + { + /* Make sure msg_type and length are consistent */ + if( memcmp( ssl->handshake->hs_msg, ssl->in_msg, 4 ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment header mismatch" ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } + } + + msg = ssl->handshake->hs_msg + 12; + bitmask = msg + msg_len; + + /* + * Check and copy current fragment + */ + frag_off = ( ssl->in_msg[6] << 16 ) | + ( ssl->in_msg[7] << 8 ) | + ssl->in_msg[8]; + frag_len = ( ssl->in_msg[9] << 16 ) | + ( ssl->in_msg[10] << 8 ) | + ssl->in_msg[11]; + + if( frag_off + frag_len > msg_len ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment offset/len: %d + %d > %d", + frag_off, frag_len, msg_len ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } + + if( frag_len + 12 > ssl->in_msglen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment length: %d + 12 > %d", + frag_len, ssl->in_msglen ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "adding fragment, offset = %d, length = %d", + frag_off, frag_len ) ); + + memcpy( msg + frag_off, ssl->in_msg + 12, frag_len ); + ssl_bitmask_set( bitmask, frag_off, frag_len ); + + /* + * Do we have the complete message by now? + * If yes, finalize it, else ask to read the next record. + */ + if( ssl_bitmask_check( bitmask, msg_len ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "message is not complete yet" ) ); + return( MBEDTLS_ERR_SSL_WANT_READ ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake message completed" ) ); + + if( frag_len + 12 < ssl->in_msglen ) + { + /* + * We'got more handshake messages in the same record. + * This case is not handled now because no know implementation does + * that and it's hard to test, so we prefer to fail cleanly for now. + */ + MBEDTLS_SSL_DEBUG_MSG( 1, ( "last fragment not alone in its record" ) ); + return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); + } + + if( ssl->in_left > ssl->next_record_offset ) + { + /* + * We've got more data in the buffer after the current record, + * that we don't want to overwrite. Move it before writing the + * reassembled message, and adjust in_left and next_record_offset. + */ + unsigned char *cur_remain = ssl->in_hdr + ssl->next_record_offset; + unsigned char *new_remain = ssl->in_msg + ssl->in_hslen; + size_t remain_len = ssl->in_left - ssl->next_record_offset; + + /* First compute and check new lengths */ + ssl->next_record_offset = new_remain - ssl->in_hdr; + ssl->in_left = ssl->next_record_offset + remain_len; + + if( ssl->in_left > MBEDTLS_SSL_BUFFER_LEN - + (size_t)( ssl->in_hdr - ssl->in_buf ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "reassembled message too large for buffer" ) ); + return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); + } + + memmove( new_remain, cur_remain, remain_len ); + } + + memcpy( ssl->in_msg, ssl->handshake->hs_msg, ssl->in_hslen ); + + mbedtls_free( ssl->handshake->hs_msg ); + ssl->handshake->hs_msg = NULL; + + MBEDTLS_SSL_DEBUG_BUF( 3, "reassembled handshake message", + ssl->in_msg, ssl->in_hslen ); + + return( 0 ); +} +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + +int mbedtls_ssl_prepare_handshake_record( mbedtls_ssl_context *ssl ) +{ + if( ssl->in_msglen < mbedtls_ssl_hs_hdr_len( ssl ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too short: %d", + ssl->in_msglen ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } + + ssl->in_hslen = mbedtls_ssl_hs_hdr_len( ssl ) + ( + ( ssl->in_msg[1] << 16 ) | + ( ssl->in_msg[2] << 8 ) | + ssl->in_msg[3] ); + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "handshake message: msglen =" + " %d, type = %d, hslen = %d", + ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) ); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + int ret; + unsigned int recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5]; + + /* ssl->handshake is NULL when receiving ClientHello for renego */ + if( ssl->handshake != NULL && + recv_msg_seq != ssl->handshake->in_msg_seq ) + { + /* Retransmit only on last message from previous flight, to avoid + * too many retransmissions. + * Besides, No sane server ever retransmits HelloVerifyRequest */ + if( recv_msg_seq == ssl->handshake->in_flight_start_seq - 1 && + ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "received message from last flight, " + "message_seq = %d, start_of_flight = %d", + recv_msg_seq, + ssl->handshake->in_flight_start_seq ) ); + + if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret ); + return( ret ); + } + } + else + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "dropping out-of-sequence message: " + "message_seq = %d, expected = %d", + recv_msg_seq, + ssl->handshake->in_msg_seq ) ); + } + + return( MBEDTLS_ERR_SSL_WANT_READ ); + } + /* Wait until message completion to increment in_msg_seq */ + + /* Reassemble if current message is fragmented or reassembly is + * already in progress */ + if( ssl->in_msglen < ssl->in_hslen || + memcmp( ssl->in_msg + 6, "\0\0\0", 3 ) != 0 || + memcmp( ssl->in_msg + 9, ssl->in_msg + 1, 3 ) != 0 || + ( ssl->handshake != NULL && ssl->handshake->hs_msg != NULL ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "found fragmented DTLS handshake message" ) ); + + if( ( ret = ssl_reassemble_dtls_handshake( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_reassemble_dtls_handshake", ret ); + return( ret ); + } + } + } + else +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + /* With TLS we don't handle fragmentation (for now) */ + if( ssl->in_msglen < ssl->in_hslen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS handshake fragmentation not supported" ) ); + return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); + } + + return( 0 ); +} + +void mbedtls_ssl_update_handshake_status( mbedtls_ssl_context *ssl ) +{ + + if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER && + ssl->handshake != NULL ) + { + ssl->handshake->update_checksum( ssl, ssl->in_msg, ssl->in_hslen ); + } + + /* Handshake message is complete, increment counter */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ssl->handshake != NULL ) + { + ssl->handshake->in_msg_seq++; + } +#endif +} + +/* + * DTLS anti-replay: RFC 6347 4.1.2.6 + * + * in_window is a field of bits numbered from 0 (lsb) to 63 (msb). + * Bit n is set iff record number in_window_top - n has been seen. + * + * Usually, in_window_top is the last record number seen and the lsb of + * in_window is set. The only exception is the initial state (record number 0 + * not seen yet). + */ +#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) +static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl ) +{ + ssl->in_window_top = 0; + ssl->in_window = 0; +} + +static inline uint64_t ssl_load_six_bytes( unsigned char *buf ) +{ + return( ( (uint64_t) buf[0] << 40 ) | + ( (uint64_t) buf[1] << 32 ) | + ( (uint64_t) buf[2] << 24 ) | + ( (uint64_t) buf[3] << 16 ) | + ( (uint64_t) buf[4] << 8 ) | + ( (uint64_t) buf[5] ) ); +} + +/* + * Return 0 if sequence number is acceptable, -1 otherwise + */ +int mbedtls_ssl_dtls_replay_check( mbedtls_ssl_context *ssl ) +{ + uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 ); + uint64_t bit; + + if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED ) + return( 0 ); + + if( rec_seqnum > ssl->in_window_top ) + return( 0 ); + + bit = ssl->in_window_top - rec_seqnum; + + if( bit >= 64 ) + return( -1 ); + + if( ( ssl->in_window & ( (uint64_t) 1 << bit ) ) != 0 ) + return( -1 ); + + return( 0 ); +} + +/* + * Update replay window on new validated record + */ +void mbedtls_ssl_dtls_replay_update( mbedtls_ssl_context *ssl ) +{ + uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 ); + + if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED ) + return; + + if( rec_seqnum > ssl->in_window_top ) + { + /* Update window_top and the contents of the window */ + uint64_t shift = rec_seqnum - ssl->in_window_top; + + if( shift >= 64 ) + ssl->in_window = 1; + else + { + ssl->in_window <<= shift; + ssl->in_window |= 1; + } + + ssl->in_window_top = rec_seqnum; + } + else + { + /* Mark that number as seen in the current window */ + uint64_t bit = ssl->in_window_top - rec_seqnum; + + if( bit < 64 ) /* Always true, but be extra sure */ + ssl->in_window |= (uint64_t) 1 << bit; + } +} +#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */ + +#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) +/* Forward declaration */ +static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial ); + +/* + * Without any SSL context, check if a datagram looks like a ClientHello with + * a valid cookie, and if it doesn't, generate a HelloVerifyRequest message. + * Both input and output include full DTLS headers. + * + * - if cookie is valid, return 0 + * - if ClientHello looks superficially valid but cookie is not, + * fill obuf and set olen, then + * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED + * - otherwise return a specific error code + */ +static int ssl_check_dtls_clihlo_cookie( + mbedtls_ssl_cookie_write_t *f_cookie_write, + mbedtls_ssl_cookie_check_t *f_cookie_check, + void *p_cookie, + const unsigned char *cli_id, size_t cli_id_len, + const unsigned char *in, size_t in_len, + unsigned char *obuf, size_t buf_len, size_t *olen ) +{ + size_t sid_len, cookie_len; + unsigned char *p; + + if( f_cookie_write == NULL || f_cookie_check == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + /* + * Structure of ClientHello with record and handshake headers, + * and expected values. We don't need to check a lot, more checks will be + * done when actually parsing the ClientHello - skipping those checks + * avoids code duplication and does not make cookie forging any easier. + * + * 0-0 ContentType type; copied, must be handshake + * 1-2 ProtocolVersion version; copied + * 3-4 uint16 epoch; copied, must be 0 + * 5-10 uint48 sequence_number; copied + * 11-12 uint16 length; (ignored) + * + * 13-13 HandshakeType msg_type; (ignored) + * 14-16 uint24 length; (ignored) + * 17-18 uint16 message_seq; copied + * 19-21 uint24 fragment_offset; copied, must be 0 + * 22-24 uint24 fragment_length; (ignored) + * + * 25-26 ProtocolVersion client_version; (ignored) + * 27-58 Random random; (ignored) + * 59-xx SessionID session_id; 1 byte len + sid_len content + * 60+ opaque cookie<0..2^8-1>; 1 byte len + content + * ... + * + * Minimum length is 61 bytes. + */ + if( in_len < 61 || + in[0] != MBEDTLS_SSL_MSG_HANDSHAKE || + in[3] != 0 || in[4] != 0 || + in[19] != 0 || in[20] != 0 || in[21] != 0 ) + { + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + } + + sid_len = in[59]; + if( sid_len > in_len - 61 ) + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + + cookie_len = in[60 + sid_len]; + if( cookie_len > in_len - 60 ) + return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO ); + + if( f_cookie_check( p_cookie, in + sid_len + 61, cookie_len, + cli_id, cli_id_len ) == 0 ) + { + /* Valid cookie */ + return( 0 ); + } + + /* + * If we get here, we've got an invalid cookie, let's prepare HVR. + * + * 0-0 ContentType type; copied + * 1-2 ProtocolVersion version; copied + * 3-4 uint16 epoch; copied + * 5-10 uint48 sequence_number; copied + * 11-12 uint16 length; olen - 13 + * + * 13-13 HandshakeType msg_type; hello_verify_request + * 14-16 uint24 length; olen - 25 + * 17-18 uint16 message_seq; copied + * 19-21 uint24 fragment_offset; copied + * 22-24 uint24 fragment_length; olen - 25 + * + * 25-26 ProtocolVersion server_version; 0xfe 0xff + * 27-27 opaque cookie<0..2^8-1>; cookie_len = olen - 27, cookie + * + * Minimum length is 28. + */ + if( buf_len < 28 ) + return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL ); + + /* Copy most fields and adapt others */ + memcpy( obuf, in, 25 ); + obuf[13] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST; + obuf[25] = 0xfe; + obuf[26] = 0xff; + + /* Generate and write actual cookie */ + p = obuf + 28; + if( f_cookie_write( p_cookie, + &p, obuf + buf_len, cli_id, cli_id_len ) != 0 ) + { + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + *olen = p - obuf; + + /* Go back and fill length fields */ + obuf[27] = (unsigned char)( *olen - 28 ); + + obuf[14] = obuf[22] = (unsigned char)( ( *olen - 25 ) >> 16 ); + obuf[15] = obuf[23] = (unsigned char)( ( *olen - 25 ) >> 8 ); + obuf[16] = obuf[24] = (unsigned char)( ( *olen - 25 ) ); + + obuf[11] = (unsigned char)( ( *olen - 13 ) >> 8 ); + obuf[12] = (unsigned char)( ( *olen - 13 ) ); + + return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ); +} + +/* + * Handle possible client reconnect with the same UDP quadruplet + * (RFC 6347 Section 4.2.8). + * + * Called by ssl_parse_record_header() in case we receive an epoch 0 record + * that looks like a ClientHello. + * + * - if the input looks like a ClientHello without cookies, + * send back HelloVerifyRequest, then + * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED + * - if the input looks like a ClientHello with a valid cookie, + * reset the session of the current context, and + * return MBEDTLS_ERR_SSL_CLIENT_RECONNECT + * - if anything goes wrong, return a specific error code + * + * mbedtls_ssl_read_record() will ignore the record if anything else than + * MBEDTLS_ERR_SSL_CLIENT_RECONNECT or 0 is returned, although this function + * cannot not return 0. + */ +static int ssl_handle_possible_reconnect( mbedtls_ssl_context *ssl ) +{ + int ret; + size_t len; + + ret = ssl_check_dtls_clihlo_cookie( + ssl->conf->f_cookie_write, + ssl->conf->f_cookie_check, + ssl->conf->p_cookie, + ssl->cli_id, ssl->cli_id_len, + ssl->in_buf, ssl->in_left, + ssl->out_buf, MBEDTLS_SSL_MAX_CONTENT_LEN, &len ); + + MBEDTLS_SSL_DEBUG_RET( 2, "ssl_check_dtls_clihlo_cookie", ret ); + + if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ) + { + /* Don't check write errors as we can't do anything here. + * If the error is permanent we'll catch it later, + * if it's not, then hopefully it'll work next time. */ + (void) ssl->f_send( ssl->p_bio, ssl->out_buf, len ); + + return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED ); + } + + if( ret == 0 ) + { + /* Got a valid cookie, partially reset context */ + if( ( ret = ssl_session_reset_int( ssl, 1 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "reset", ret ); + return( ret ); + } + + return( MBEDTLS_ERR_SSL_CLIENT_RECONNECT ); + } + + return( ret ); +} +#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */ + +/* + * ContentType type; + * ProtocolVersion version; + * uint16 epoch; // DTLS only + * uint48 sequence_number; // DTLS only + * uint16 length; + * + * Return 0 if header looks sane (and, for DTLS, the record is expected) + * MBEDTLS_ERR_SSL_INVALID_RECORD if the header looks bad, + * MBEDTLS_ERR_SSL_UNEXPECTED_RECORD (DTLS only) if sane but unexpected. + * + * With DTLS, mbedtls_ssl_read_record() will: + * 1. proceed with the record if this function returns 0 + * 2. drop only the current record if this function returns UNEXPECTED_RECORD + * 3. return CLIENT_RECONNECT if this function return that value + * 4. drop the whole datagram if this function returns anything else. + * Point 2 is needed when the peer is resending, and we have already received + * the first record from a datagram but are still waiting for the others. + */ +static int ssl_parse_record_header( mbedtls_ssl_context *ssl ) +{ + int major_ver, minor_ver; + + MBEDTLS_SSL_DEBUG_BUF( 4, "input record header", ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) ); + + ssl->in_msgtype = ssl->in_hdr[0]; + ssl->in_msglen = ( ssl->in_len[0] << 8 ) | ssl->in_len[1]; + mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, ssl->in_hdr + 1 ); + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, " + "version = [%d:%d], msglen = %d", + ssl->in_msgtype, + major_ver, minor_ver, ssl->in_msglen ) ); + + /* Check record type */ + if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE && + ssl->in_msgtype != MBEDTLS_SSL_MSG_ALERT && + ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC && + ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "unknown record type" ) ); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + /* Silently ignore invalid DTLS records as recommended by RFC 6347 + * Section 4.1.2.7 */ + if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); + + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } + + /* Check version */ + if( major_ver != ssl->major_ver ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "major version mismatch" ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } + + if( minor_ver > ssl->conf->max_minor_ver ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } + + /* Check length against the size of our buffer */ + if( ssl->in_msglen > MBEDTLS_SSL_BUFFER_LEN + - (size_t)( ssl->in_msg - ssl->in_buf ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } + + /* Check length against bounds of the current transform and version */ + if( ssl->transform_in == NULL ) + { + if( ssl->in_msglen < 1 || + ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } + } + else + { + if( ssl->in_msglen < ssl->transform_in->minlen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } + +#if defined(MBEDTLS_SSL_PROTO_SSL3) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 && + ssl->in_msglen > ssl->transform_in->minlen + MBEDTLS_SSL_MAX_CONTENT_LEN ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } +#endif +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_2) + /* + * TLS encrypted messages can have up to 256 bytes of padding + */ + if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 && + ssl->in_msglen > ssl->transform_in->minlen + + MBEDTLS_SSL_MAX_CONTENT_LEN + 256 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } +#endif + } + + /* + * DTLS-related tests done last, because most of them may result in + * silently dropping the record (but not the whole datagram), and we only + * want to consider that after ensuring that the "basic" fields (type, + * version, length) are sane. + */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + unsigned int rec_epoch = ( ssl->in_ctr[0] << 8 ) | ssl->in_ctr[1]; + + /* Drop unexpected ChangeCipherSpec messages */ + if( ssl->in_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC && + ssl->state != MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC && + ssl->state != MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ChangeCipherSpec" ) ); + return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ); + } + + /* Drop unexpected ApplicationData records, + * except at the beginning of renegotiations */ + if( ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA && + ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER +#if defined(MBEDTLS_SSL_RENEGOTIATION) + && ! ( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS && + ssl->state == MBEDTLS_SSL_SERVER_HELLO ) +#endif + ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ApplicationData" ) ); + return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ); + } + + /* Check epoch (and sequence number) with DTLS */ + if( rec_epoch != ssl->in_epoch ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "record from another epoch: " + "expected %d, received %d", + ssl->in_epoch, rec_epoch ) ); + +#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C) + /* + * Check for an epoch 0 ClientHello. We can't use in_msg here to + * access the first byte of record content (handshake type), as we + * have an active transform (possibly iv_len != 0), so use the + * fact that the record header len is 13 instead. + */ + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && + ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER && + rec_epoch == 0 && + ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && + ssl->in_left > 13 && + ssl->in_buf[13] == MBEDTLS_SSL_HS_CLIENT_HELLO ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "possible client reconnect " + "from the same port" ) ); + return( ssl_handle_possible_reconnect( ssl ) ); + } + else +#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */ + return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ); + } + +#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) + /* Replay detection only works for the current epoch */ + if( rec_epoch == ssl->in_epoch && + mbedtls_ssl_dtls_replay_check( ssl ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record" ) ); + return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ); + } +#endif + } +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + + return( 0 ); +} + +/* + * If applicable, decrypt (and decompress) record content + */ +static int ssl_prepare_record_content( mbedtls_ssl_context *ssl ) +{ + int ret, done = 0; + + MBEDTLS_SSL_DEBUG_BUF( 4, "input record from network", + ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen ); + +#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) + if( mbedtls_ssl_hw_record_read != NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_read()" ) ); + + ret = mbedtls_ssl_hw_record_read( ssl ); + if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_read", ret ); + return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); + } + + if( ret == 0 ) + done = 1; + } +#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */ + if( !done && ssl->transform_in != NULL ) + { + if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret ); + return( ret ); + } + + MBEDTLS_SSL_DEBUG_BUF( 4, "input payload after decrypt", + ssl->in_msg, ssl->in_msglen ); + + if( ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) ); + return( MBEDTLS_ERR_SSL_INVALID_RECORD ); + } + } + +#if defined(MBEDTLS_ZLIB_SUPPORT) + if( ssl->transform_in != NULL && + ssl->session_in->compression == MBEDTLS_SSL_COMPRESS_DEFLATE ) + { + if( ( ret = ssl_decompress_buf( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decompress_buf", ret ); + return( ret ); + } + } +#endif /* MBEDTLS_ZLIB_SUPPORT */ + +#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + mbedtls_ssl_dtls_replay_update( ssl ); + } +#endif + + return( 0 ); +} + +static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl ); + +/* + * Read a record. + * + * Silently ignore non-fatal alert (and for DTLS, invalid records as well, + * RFC 6347 4.1.2.7) and continue reading until a valid record is found. + * + */ +int mbedtls_ssl_read_record( mbedtls_ssl_context *ssl ) +{ + int ret; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read record" ) ); + + if( ssl->keep_current_message == 0 ) + { + do { + + if( ( ret = mbedtls_ssl_read_record_layer( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record_layer" ), ret ); + return( ret ); + } + + ret = mbedtls_ssl_handle_message_type( ssl ); + + } while( MBEDTLS_ERR_SSL_NON_FATAL == ret ); + + if( 0 != ret ) + { + MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record_layer" ), ret ); + return( ret ); + } + + if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) + { + mbedtls_ssl_update_handshake_status( ssl ); + } + } + else + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= reuse previously read message" ) ); + ssl->keep_current_message = 0; + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read record" ) ); + + return( 0 ); +} + +int mbedtls_ssl_read_record_layer( mbedtls_ssl_context *ssl ) +{ + int ret; + + /* + * Step A + * + * Consume last content-layer message and potentially + * update in_msglen which keeps track of the contents' + * consumption state. + * + * (1) Handshake messages: + * Remove last handshake message, move content + * and adapt in_msglen. + * + * (2) Alert messages: + * Consume whole record content, in_msglen = 0. + * + * NOTE: This needs to be fixed, since like for + * handshake messages it is allowed to have + * multiple alerts witin a single record. + * Internal reference IOTSSL-1321. + * + * (3) Change cipher spec: + * Consume whole record content, in_msglen = 0. + * + * (4) Application data: + * Don't do anything - the record layer provides + * the application data as a stream transport + * and consumes through mbedtls_ssl_read only. + * + */ + + /* Case (1): Handshake messages */ + if( ssl->in_hslen != 0 ) + { + /* Hard assertion to be sure that no application data + * is in flight, as corrupting ssl->in_msglen during + * ssl->in_offt != NULL is fatal. */ + if( ssl->in_offt != NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + /* + * Get next Handshake message in the current record + */ + + /* Notes: + * (1) in_hslen is *NOT* necessarily the size of the + * current handshake content: If DTLS handshake + * fragmentation is used, that's the fragment + * size instead. Using the total handshake message + * size here is FAULTY and should be changed at + * some point. Internal reference IOTSSL-1414. + * (2) While it doesn't seem to cause problems, one + * has to be very careful not to assume that in_hslen + * is always <= in_msglen in a sensible communication. + * Again, it's wrong for DTLS handshake fragmentation. + * The following check is therefore mandatory, and + * should not be treated as a silently corrected assertion. + * Additionally, ssl->in_hslen might be arbitrarily out of + * bounds after handling a DTLS message with an unexpected + * sequence number, see mbedtls_ssl_prepare_handshake_record. + */ + if( ssl->in_hslen < ssl->in_msglen ) + { + ssl->in_msglen -= ssl->in_hslen; + memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen, + ssl->in_msglen ); + + MBEDTLS_SSL_DEBUG_BUF( 4, "remaining content in record", + ssl->in_msg, ssl->in_msglen ); + } + else + { + ssl->in_msglen = 0; + } + + ssl->in_hslen = 0; + } + /* Case (4): Application data */ + else if( ssl->in_offt != NULL ) + { + return( 0 ); + } + /* Everything else (CCS & Alerts) */ + else + { + ssl->in_msglen = 0; + } + + /* + * Step B + * + * Fetch and decode new record if current one is fully consumed. + * + */ + + if( ssl->in_msglen > 0 ) + { + /* There's something left to be processed in the current record. */ + return( 0 ); + } + + /* Need to fetch a new record */ + +#if defined(MBEDTLS_SSL_PROTO_DTLS) +read_record_header: +#endif + + /* Current record either fully processed or to be discarded. */ + + if( ( ret = mbedtls_ssl_fetch_input( ssl, mbedtls_ssl_hdr_len( ssl ) ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); + return( ret ); + } + + if( ( ret = ssl_parse_record_header( ssl ) ) != 0 ) + { +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ret != MBEDTLS_ERR_SSL_CLIENT_RECONNECT ) + { + if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_RECORD ) + { + /* Skip unexpected record (but not whole datagram) */ + ssl->next_record_offset = ssl->in_msglen + + mbedtls_ssl_hdr_len( ssl ); + + MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding unexpected record " + "(header)" ) ); + } + else + { + /* Skip invalid record and the rest of the datagram */ + ssl->next_record_offset = 0; + ssl->in_left = 0; + + MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record " + "(header)" ) ); + } + + /* Get next record */ + goto read_record_header; + } +#endif + return( ret ); + } + + /* + * Read and optionally decrypt the message contents + */ + if( ( ret = mbedtls_ssl_fetch_input( ssl, + mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret ); + return( ret ); + } + + /* Done reading this record, get ready for the next one */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + ssl->next_record_offset = ssl->in_msglen + mbedtls_ssl_hdr_len( ssl ); + else +#endif + ssl->in_left = 0; + + if( ( ret = ssl_prepare_record_content( ssl ) ) != 0 ) + { +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + /* Silently discard invalid records */ + if( ret == MBEDTLS_ERR_SSL_INVALID_RECORD || + ret == MBEDTLS_ERR_SSL_INVALID_MAC ) + { + /* Except when waiting for Finished as a bad mac here + * probably means something went wrong in the handshake + * (eg wrong psk used, mitm downgrade attempt, etc.) */ + if( ssl->state == MBEDTLS_SSL_CLIENT_FINISHED || + ssl->state == MBEDTLS_SSL_SERVER_FINISHED ) + { +#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES) + if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) + { + mbedtls_ssl_send_alert_message( ssl, + MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC ); + } +#endif + return( ret ); + } + +#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) + if( ssl->conf->badmac_limit != 0 && + ++ssl->badmac_seen >= ssl->conf->badmac_limit ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "too many records with bad MAC" ) ); + return( MBEDTLS_ERR_SSL_INVALID_MAC ); + } +#endif + + /* As above, invalid records cause + * dismissal of the whole datagram. */ + + ssl->next_record_offset = 0; + ssl->in_left = 0; + + MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record (mac)" ) ); + goto read_record_header; + } + + return( ret ); + } + else +#endif + { + /* Error out (and send alert) on invalid records */ +#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES) + if( ret == MBEDTLS_ERR_SSL_INVALID_MAC ) + { + mbedtls_ssl_send_alert_message( ssl, + MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC ); + } +#endif + return( ret ); + } + } + + /* + * When we sent the last flight of the handshake, we MUST respond to a + * retransmit of the peer's previous flight with a retransmit. (In + * practice, only the Finished message will make it, other messages + * including CCS use the old transform so they're dropped as invalid.) + * + * If the record we received is not a handshake message, however, it + * means the peer received our last flight so we can clean up + * handshake info. + * + * This check needs to be done before prepare_handshake() due to an edge + * case: if the client immediately requests renegotiation, this + * finishes the current handshake first, avoiding the new ClientHello + * being mistaken for an ancient message in the current handshake. + */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ssl->handshake != NULL && + ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) + { + if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && + ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "received retransmit of last flight" ) ); + + if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret ); + return( ret ); + } + + return( MBEDTLS_ERR_SSL_WANT_READ ); + } + else + { + ssl_handshake_wrapup_free_hs_transform( ssl ); + } + } +#endif + + return( 0 ); +} + +int mbedtls_ssl_handle_message_type( mbedtls_ssl_context *ssl ) +{ + int ret; + + /* + * Handle particular types of records + */ + if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) + { + if( ( ret = mbedtls_ssl_prepare_handshake_record( ssl ) ) != 0 ) + { + return( ret ); + } + } + + if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]", + ssl->in_msg[0], ssl->in_msg[1] ) ); + + /* + * Ignore non-fatal alerts, except close_notify and no_renegotiation + */ + if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_FATAL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "is a fatal alert message (msg %d)", + ssl->in_msg[1] ) ); + return( MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE ); + } + + if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && + ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a close notify message" ) ); + return( MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY ); + } + +#if defined(MBEDTLS_SSL_RENEGOTIATION_ENABLED) + if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && + ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) ); + /* Will be handled when trying to parse ServerHello */ + return( 0 ); + } +#endif + +#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_SRV_C) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 && + ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && + ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && + ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) ); + /* Will be handled in mbedtls_ssl_parse_certificate() */ + return( 0 ); + } +#endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */ + + /* Silently ignore: fetch new message */ + return MBEDTLS_ERR_SSL_NON_FATAL; + } + + return( 0 ); +} + +int mbedtls_ssl_send_fatal_handshake_failure( mbedtls_ssl_context *ssl ) +{ + int ret; + + if( ( ret = mbedtls_ssl_send_alert_message( ssl, + MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ) ) != 0 ) + { + return( ret ); + } + + return( 0 ); +} + +int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl, + unsigned char level, + unsigned char message ) +{ + int ret; + + if( ssl == NULL || ssl->conf == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> send alert message" ) ); + MBEDTLS_SSL_DEBUG_MSG( 3, ( "send alert level=%u message=%u", level, message )); + + ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT; + ssl->out_msglen = 2; + ssl->out_msg[0] = level; + ssl->out_msg[1] = message; + + if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); + return( ret ); + } + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= send alert message" ) ); + + return( 0 ); +} + +/* + * Handshake functions + */ +#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \ + !defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) && \ + !defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \ + !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \ + !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) && \ + !defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \ + !defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) +/* No certificate support -> dummy functions */ +int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl ) +{ + const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) ); + + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); + ssl->state++; + return( 0 ); + } + + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); +} + +int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) +{ + const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); + + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); + ssl->state++; + return( 0 ); + } + + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); +} + +#else +/* Some certificate support -> implement write and parse */ + +int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl ) +{ + int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; + size_t i, n; + const mbedtls_x509_crt *crt; + const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) ); + + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); + ssl->state++; + return( 0 ); + } + +#if defined(MBEDTLS_SSL_CLI_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) + { + if( ssl->client_auth == 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); + ssl->state++; + return( 0 ); + } + +#if defined(MBEDTLS_SSL_PROTO_SSL3) + /* + * If using SSLv3 and got no cert, send an Alert message + * (otherwise an empty Certificate message will be sent). + */ + if( mbedtls_ssl_own_cert( ssl ) == NULL && + ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) + { + ssl->out_msglen = 2; + ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT; + ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING; + ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) ); + goto write_msg; + } +#endif /* MBEDTLS_SSL_PROTO_SSL3 */ + } +#endif /* MBEDTLS_SSL_CLI_C */ +#if defined(MBEDTLS_SSL_SRV_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) + { + if( mbedtls_ssl_own_cert( ssl ) == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) ); + return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED ); + } + } +#endif + + MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", mbedtls_ssl_own_cert( ssl ) ); + + /* + * 0 . 0 handshake type + * 1 . 3 handshake length + * 4 . 6 length of all certs + * 7 . 9 length of cert. 1 + * 10 . n-1 peer certificate + * n . n+2 length of cert. 2 + * n+3 . ... upper level cert, etc. + */ + i = 7; + crt = mbedtls_ssl_own_cert( ssl ); + + while( crt != NULL ) + { + n = crt->raw.len; + if( n > MBEDTLS_SSL_MAX_CONTENT_LEN - 3 - i ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d", + i + 3 + n, MBEDTLS_SSL_MAX_CONTENT_LEN ) ); + return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE ); + } + + ssl->out_msg[i ] = (unsigned char)( n >> 16 ); + ssl->out_msg[i + 1] = (unsigned char)( n >> 8 ); + ssl->out_msg[i + 2] = (unsigned char)( n ); + + i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n ); + i += n; crt = crt->next; + } + + ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 ); + ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 ); + ssl->out_msg[6] = (unsigned char)( ( i - 7 ) ); + + ssl->out_msglen = i; + ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; + ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE; + +#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C) +write_msg: +#endif + + ssl->state++; + + if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); + return( ret ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) ); + + return( ret ); +} + +int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl ) +{ + int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; + size_t i, n; + const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; + int authmode = ssl->conf->authmode; + uint8_t alert; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); + + if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK || + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); + ssl->state++; + return( 0 ); + } + +#if defined(MBEDTLS_SSL_SRV_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && + ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); + ssl->state++; + return( 0 ); + } + +#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) + if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET ) + authmode = ssl->handshake->sni_authmode; +#endif + + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && + authmode == MBEDTLS_SSL_VERIFY_NONE ) + { + ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_SKIP_VERIFY; + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); + ssl->state++; + return( 0 ); + } +#endif + + if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 ) + { + /* mbedtls_ssl_read_record may have sent an alert already. We + let it decide whether to alert. */ + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); + return( ret ); + } + + ssl->state++; + +#if defined(MBEDTLS_SSL_SRV_C) +#if defined(MBEDTLS_SSL_PROTO_SSL3) + /* + * Check if the client sent an empty certificate + */ + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && + ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) + { + if( ssl->in_msglen == 2 && + ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT && + ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING && + ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) ); + + /* The client was asked for a certificate but didn't send + one. The client should know what's going on, so we + don't send an alert. */ + ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING; + if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL ) + return( 0 ); + else + return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE ); + } + } +#endif /* MBEDTLS_SSL_PROTO_SSL3 */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_2) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && + ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 ) + { + if( ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len( ssl ) && + ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE && + ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE && + memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), "\0\0\0", 3 ) == 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) ); + + /* The client was asked for a certificate but didn't send + one. The client should know what's going on, so we + don't send an alert. */ + ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING; + if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL ) + return( 0 ); + else + return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE ); + } + } +#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ + MBEDTLS_SSL_PROTO_TLS1_2 */ +#endif /* MBEDTLS_SSL_SRV_C */ + + if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); + return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); + } + + if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE || + ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 3 + 3 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); + } + + i = mbedtls_ssl_hs_hdr_len( ssl ); + + /* + * Same message structure as in mbedtls_ssl_write_certificate() + */ + n = ( ssl->in_msg[i+1] << 8 ) | ssl->in_msg[i+2]; + + if( ssl->in_msg[i] != 0 || + ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len( ssl ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); + } + + /* In case we tried to reuse a session but it failed */ + if( ssl->session_negotiate->peer_cert != NULL ) + { + mbedtls_x509_crt_free( ssl->session_negotiate->peer_cert ); + mbedtls_free( ssl->session_negotiate->peer_cert ); + } + + if( ( ssl->session_negotiate->peer_cert = mbedtls_calloc( 1, + sizeof( mbedtls_x509_crt ) ) ) == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", + sizeof( mbedtls_x509_crt ) ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + } + + mbedtls_x509_crt_init( ssl->session_negotiate->peer_cert ); + + i += 3; + + while( i < ssl->in_hslen ) + { + if( ssl->in_msg[i] != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); + } + + n = ( (unsigned int) ssl->in_msg[i + 1] << 8 ) + | (unsigned int) ssl->in_msg[i + 2]; + i += 3; + + if( n < 128 || i + n > ssl->in_hslen ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); + } + + ret = mbedtls_x509_crt_parse_der( ssl->session_negotiate->peer_cert, + ssl->in_msg + i, n ); + switch( ret ) + { + case 0: /*ok*/ + case MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND: + /* Ignore certificate with an unknown algorithm: maybe a + prior certificate was already trusted. */ + break; + + case MBEDTLS_ERR_X509_ALLOC_FAILED: + alert = MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR; + goto crt_parse_der_failed; + + case MBEDTLS_ERR_X509_UNKNOWN_VERSION: + alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; + goto crt_parse_der_failed; + + default: + alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; + crt_parse_der_failed: + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, alert ); + MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret ); + return( ret ); + } + + i += n; + } + + MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", ssl->session_negotiate->peer_cert ); + + /* + * On client, make sure the server cert doesn't change during renego to + * avoid "triple handshake" attack: https://secure-resumption.com/ + */ +#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && + ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) + { + if( ssl->session->peer_cert == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED ); + return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); + } + + if( ssl->session->peer_cert->raw.len != + ssl->session_negotiate->peer_cert->raw.len || + memcmp( ssl->session->peer_cert->raw.p, + ssl->session_negotiate->peer_cert->raw.p, + ssl->session->peer_cert->raw.len ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "server cert changed during renegotiation" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED ); + return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ); + } + } +#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */ + + if( authmode != MBEDTLS_SSL_VERIFY_NONE ) + { + mbedtls_x509_crt *ca_chain; + mbedtls_x509_crl *ca_crl; + +#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) + if( ssl->handshake->sni_ca_chain != NULL ) + { + ca_chain = ssl->handshake->sni_ca_chain; + ca_crl = ssl->handshake->sni_ca_crl; + } + else +#endif + { + ca_chain = ssl->conf->ca_chain; + ca_crl = ssl->conf->ca_crl; + } + + /* + * Main check: verify certificate + */ + ret = mbedtls_x509_crt_verify_with_profile( + ssl->session_negotiate->peer_cert, + ca_chain, ca_crl, + ssl->conf->cert_profile, + ssl->hostname, + &ssl->session_negotiate->verify_result, + ssl->conf->f_vrfy, ssl->conf->p_vrfy ); + + if( ret != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret ); + } + + /* + * Secondary checks: always done, but change 'ret' only if it was 0 + */ + +#if defined(MBEDTLS_ECP_C) + { + const mbedtls_pk_context *pk = &ssl->session_negotiate->peer_cert->pk; + + /* If certificate uses an EC key, make sure the curve is OK */ + if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) && + mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 ) + { + ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY; + + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) ); + if( ret == 0 ) + ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; + } + } +#endif /* MBEDTLS_ECP_C */ + + if( mbedtls_ssl_check_cert_usage( ssl->session_negotiate->peer_cert, + ciphersuite_info, + ! ssl->conf->endpoint, + &ssl->session_negotiate->verify_result ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) ); + if( ret == 0 ) + ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE; + } + + /* mbedtls_x509_crt_verify_with_profile is supposed to report a + * verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED, + * with details encoded in the verification flags. All other kinds + * of error codes, including those from the user provided f_vrfy + * functions, are treated as fatal and lead to a failure of + * ssl_parse_certificate even if verification was optional. */ + if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL && + ( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED || + ret == MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ) ) + { + ret = 0; + } + + if( ca_chain == NULL && authmode == MBEDTLS_SSL_VERIFY_REQUIRED ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) ); + ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED; + } + + if( ret != 0 ) + { + /* The certificate may have been rejected for several reasons. + Pick one and send the corresponding alert. Which alert to send + may be a subject of debate in some cases. */ + if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_OTHER ) + alert = MBEDTLS_SSL_ALERT_MSG_ACCESS_DENIED; + else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_CN_MISMATCH ) + alert = MBEDTLS_SSL_ALERT_MSG_BAD_CERT; + else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_KEY_USAGE ) + alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; + else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXT_KEY_USAGE ) + alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; + else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NS_CERT_TYPE ) + alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; + else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_PK ) + alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; + else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_BAD_KEY ) + alert = MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_CERT; + else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_EXPIRED ) + alert = MBEDTLS_SSL_ALERT_MSG_CERT_EXPIRED; + else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_REVOKED ) + alert = MBEDTLS_SSL_ALERT_MSG_CERT_REVOKED; + else if( ssl->session_negotiate->verify_result & MBEDTLS_X509_BADCERT_NOT_TRUSTED ) + alert = MBEDTLS_SSL_ALERT_MSG_UNKNOWN_CA; + else + alert = MBEDTLS_SSL_ALERT_MSG_CERT_UNKNOWN; + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + alert ); + } + +#if defined(MBEDTLS_DEBUG_C) + if( ssl->session_negotiate->verify_result != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %x", + ssl->session_negotiate->verify_result ) ); + } + else + { + MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate verification flags clear" ) ); + } +#endif /* MBEDTLS_DEBUG_C */ + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) ); + + return( ret ); +} +#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED + !MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED + !MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED + !MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED + !MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED + !MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED + !MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ + +int mbedtls_ssl_write_change_cipher_spec( mbedtls_ssl_context *ssl ) +{ + int ret; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) ); + + ssl->out_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC; + ssl->out_msglen = 1; + ssl->out_msg[0] = 1; + + ssl->state++; + + if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); + return( ret ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) ); + + return( 0 ); +} + +int mbedtls_ssl_parse_change_cipher_spec( mbedtls_ssl_context *ssl ) +{ + int ret; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) ); + + if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); + return( ret ); + } + + if( ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); + return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); + } + + if( ssl->in_msglen != 1 || ssl->in_msg[0] != 1 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC ); + } + + /* + * Switch to our negotiated transform and session parameters for inbound + * data. + */ + MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) ); + ssl->transform_in = ssl->transform_negotiate; + ssl->session_in = ssl->session_negotiate; + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { +#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) + ssl_dtls_replay_reset( ssl ); +#endif + + /* Increment epoch */ + if( ++ssl->in_epoch == 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) ); + /* This is highly unlikely to happen for legitimate reasons, so + treat it as an attack and don't send an alert. */ + return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); + } + } + else +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + memset( ssl->in_ctr, 0, 8 ); + + /* + * Set the in_msg pointer to the correct location based on IV length + */ + if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) + { + ssl->in_msg = ssl->in_iv + ssl->transform_negotiate->ivlen - + ssl->transform_negotiate->fixed_ivlen; + } + else + ssl->in_msg = ssl->in_iv; + +#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) + if( mbedtls_ssl_hw_record_activate != NULL ) + { + if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_INBOUND ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); + return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); + } + } +#endif + + ssl->state++; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) ); + + return( 0 ); +} + +void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl, + const mbedtls_ssl_ciphersuite_t *ciphersuite_info ) +{ + ((void) ciphersuite_info); + +#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_1) + if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 ) + ssl->handshake->update_checksum = ssl_update_checksum_md5sha1; + else +#endif +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +#if defined(MBEDTLS_SHA512_C) + if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) + ssl->handshake->update_checksum = ssl_update_checksum_sha384; + else +#endif +#if defined(MBEDTLS_SHA256_C) + if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 ) + ssl->handshake->update_checksum = ssl_update_checksum_sha256; + else +#endif +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return; + } +} + +void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl ) +{ +#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_1) + mbedtls_md5_starts_ret( &ssl->handshake->fin_md5 ); + mbedtls_sha1_starts_ret( &ssl->handshake->fin_sha1 ); +#endif +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +#if defined(MBEDTLS_SHA256_C) + mbedtls_sha256_starts_ret( &ssl->handshake->fin_sha256, 0 ); +#endif +#if defined(MBEDTLS_SHA512_C) + mbedtls_sha512_starts_ret( &ssl->handshake->fin_sha512, 1 ); +#endif +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ +} + +static void ssl_update_checksum_start( mbedtls_ssl_context *ssl, + const unsigned char *buf, size_t len ) +{ +#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_1) + mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len ); + mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len ); +#endif +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +#if defined(MBEDTLS_SHA256_C) + mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len ); +#endif +#if defined(MBEDTLS_SHA512_C) + mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len ); +#endif +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ +} + +#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_1) +static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *ssl, + const unsigned char *buf, size_t len ) +{ + mbedtls_md5_update_ret( &ssl->handshake->fin_md5 , buf, len ); + mbedtls_sha1_update_ret( &ssl->handshake->fin_sha1, buf, len ); +} +#endif + +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +#if defined(MBEDTLS_SHA256_C) +static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl, + const unsigned char *buf, size_t len ) +{ + mbedtls_sha256_update_ret( &ssl->handshake->fin_sha256, buf, len ); +} +#endif + +#if defined(MBEDTLS_SHA512_C) +static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl, + const unsigned char *buf, size_t len ) +{ + mbedtls_sha512_update_ret( &ssl->handshake->fin_sha512, buf, len ); +} +#endif +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + +#if defined(MBEDTLS_SSL_PROTO_SSL3) +static void ssl_calc_finished_ssl( + mbedtls_ssl_context *ssl, unsigned char *buf, int from ) +{ + const char *sender; + mbedtls_md5_context md5; + mbedtls_sha1_context sha1; + + unsigned char padbuf[48]; + unsigned char md5sum[16]; + unsigned char sha1sum[20]; + + mbedtls_ssl_session *session = ssl->session_negotiate; + if( !session ) + session = ssl->session; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) ); + + mbedtls_md5_init( &md5 ); + mbedtls_sha1_init( &sha1 ); + + mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); + mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); + + /* + * SSLv3: + * hash = + * MD5( master + pad2 + + * MD5( handshake + sender + master + pad1 ) ) + * + SHA1( master + pad2 + + * SHA1( handshake + sender + master + pad1 ) ) + */ + +#if !defined(MBEDTLS_MD5_ALT) + MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) + md5.state, sizeof( md5.state ) ); +#endif + +#if !defined(MBEDTLS_SHA1_ALT) + MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) + sha1.state, sizeof( sha1.state ) ); +#endif + + sender = ( from == MBEDTLS_SSL_IS_CLIENT ) ? "CLNT" + : "SRVR"; + + memset( padbuf, 0x36, 48 ); + + mbedtls_md5_update_ret( &md5, (const unsigned char *) sender, 4 ); + mbedtls_md5_update_ret( &md5, session->master, 48 ); + mbedtls_md5_update_ret( &md5, padbuf, 48 ); + mbedtls_md5_finish_ret( &md5, md5sum ); + + mbedtls_sha1_update_ret( &sha1, (const unsigned char *) sender, 4 ); + mbedtls_sha1_update_ret( &sha1, session->master, 48 ); + mbedtls_sha1_update_ret( &sha1, padbuf, 40 ); + mbedtls_sha1_finish_ret( &sha1, sha1sum ); + + memset( padbuf, 0x5C, 48 ); + + mbedtls_md5_starts_ret( &md5 ); + mbedtls_md5_update_ret( &md5, session->master, 48 ); + mbedtls_md5_update_ret( &md5, padbuf, 48 ); + mbedtls_md5_update_ret( &md5, md5sum, 16 ); + mbedtls_md5_finish_ret( &md5, buf ); + + mbedtls_sha1_starts_ret( &sha1 ); + mbedtls_sha1_update_ret( &sha1, session->master, 48 ); + mbedtls_sha1_update_ret( &sha1, padbuf , 40 ); + mbedtls_sha1_update_ret( &sha1, sha1sum, 20 ); + mbedtls_sha1_finish_ret( &sha1, buf + 16 ); + + MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 ); + + mbedtls_md5_free( &md5 ); + mbedtls_sha1_free( &sha1 ); + + mbedtls_zeroize( padbuf, sizeof( padbuf ) ); + mbedtls_zeroize( md5sum, sizeof( md5sum ) ); + mbedtls_zeroize( sha1sum, sizeof( sha1sum ) ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); +} +#endif /* MBEDTLS_SSL_PROTO_SSL3 */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) +static void ssl_calc_finished_tls( + mbedtls_ssl_context *ssl, unsigned char *buf, int from ) +{ + int len = 12; + const char *sender; + mbedtls_md5_context md5; + mbedtls_sha1_context sha1; + unsigned char padbuf[36]; + + mbedtls_ssl_session *session = ssl->session_negotiate; + if( !session ) + session = ssl->session; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) ); + + mbedtls_md5_init( &md5 ); + mbedtls_sha1_init( &sha1 ); + + mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 ); + mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 ); + + /* + * TLSv1: + * hash = PRF( master, finished_label, + * MD5( handshake ) + SHA1( handshake ) )[0..11] + */ + +#if !defined(MBEDTLS_MD5_ALT) + MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) + md5.state, sizeof( md5.state ) ); +#endif + +#if !defined(MBEDTLS_SHA1_ALT) + MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) + sha1.state, sizeof( sha1.state ) ); +#endif + + sender = ( from == MBEDTLS_SSL_IS_CLIENT ) + ? "client finished" + : "server finished"; + + mbedtls_md5_finish_ret( &md5, padbuf ); + mbedtls_sha1_finish_ret( &sha1, padbuf + 16 ); + + ssl->handshake->tls_prf( session->master, 48, sender, + padbuf, 36, buf, len ); + + MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); + + mbedtls_md5_free( &md5 ); + mbedtls_sha1_free( &sha1 ); + + mbedtls_zeroize( padbuf, sizeof( padbuf ) ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); +} +#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +#if defined(MBEDTLS_SHA256_C) +static void ssl_calc_finished_tls_sha256( + mbedtls_ssl_context *ssl, unsigned char *buf, int from ) +{ + int len = 12; + const char *sender; + mbedtls_sha256_context sha256; + unsigned char padbuf[32]; + + mbedtls_ssl_session *session = ssl->session_negotiate; + if( !session ) + session = ssl->session; + + mbedtls_sha256_init( &sha256 ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) ); + + mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 ); + + /* + * TLSv1.2: + * hash = PRF( master, finished_label, + * Hash( handshake ) )[0.11] + */ + +#if !defined(MBEDTLS_SHA256_ALT) + MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *) + sha256.state, sizeof( sha256.state ) ); +#endif + + sender = ( from == MBEDTLS_SSL_IS_CLIENT ) + ? "client finished" + : "server finished"; + + mbedtls_sha256_finish_ret( &sha256, padbuf ); + + ssl->handshake->tls_prf( session->master, 48, sender, + padbuf, 32, buf, len ); + + MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); + + mbedtls_sha256_free( &sha256 ); + + mbedtls_zeroize( padbuf, sizeof( padbuf ) ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); +} +#endif /* MBEDTLS_SHA256_C */ + +#if defined(MBEDTLS_SHA512_C) +static void ssl_calc_finished_tls_sha384( + mbedtls_ssl_context *ssl, unsigned char *buf, int from ) +{ + int len = 12; + const char *sender; + mbedtls_sha512_context sha512; + unsigned char padbuf[48]; + + mbedtls_ssl_session *session = ssl->session_negotiate; + if( !session ) + session = ssl->session; + + mbedtls_sha512_init( &sha512 ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) ); + + mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 ); + + /* + * TLSv1.2: + * hash = PRF( master, finished_label, + * Hash( handshake ) )[0.11] + */ + +#if !defined(MBEDTLS_SHA512_ALT) + MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *) + sha512.state, sizeof( sha512.state ) ); +#endif + + sender = ( from == MBEDTLS_SSL_IS_CLIENT ) + ? "client finished" + : "server finished"; + + mbedtls_sha512_finish_ret( &sha512, padbuf ); + + ssl->handshake->tls_prf( session->master, 48, sender, + padbuf, 48, buf, len ); + + MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); + + mbedtls_sha512_free( &sha512 ); + + mbedtls_zeroize( padbuf, sizeof( padbuf ) ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); +} +#endif /* MBEDTLS_SHA512_C */ +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + +static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl ) +{ + MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup: final free" ) ); + + /* + * Free our handshake params + */ + mbedtls_ssl_handshake_free( ssl->handshake ); + mbedtls_free( ssl->handshake ); + ssl->handshake = NULL; + + /* + * Free the previous transform and swith in the current one + */ + if( ssl->transform ) + { + mbedtls_ssl_transform_free( ssl->transform ); + mbedtls_free( ssl->transform ); + } + ssl->transform = ssl->transform_negotiate; + ssl->transform_negotiate = NULL; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup: final free" ) ); +} + +void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl ) +{ + int resume = ssl->handshake->resume; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) ); + +#if defined(MBEDTLS_SSL_RENEGOTIATION) + if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) + { + ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE; + ssl->renego_records_seen = 0; + } +#endif + + /* + * Free the previous session and switch in the current one + */ + if( ssl->session ) + { +#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) + /* RFC 7366 3.1: keep the EtM state */ + ssl->session_negotiate->encrypt_then_mac = + ssl->session->encrypt_then_mac; +#endif + + mbedtls_ssl_session_free( ssl->session ); + mbedtls_free( ssl->session ); + } + ssl->session = ssl->session_negotiate; + ssl->session_negotiate = NULL; + + /* + * Add cache entry + */ + if( ssl->conf->f_set_cache != NULL && + ssl->session->id_len != 0 && + resume == 0 ) + { + if( ssl->conf->f_set_cache( ssl->conf->p_cache, ssl->session ) != 0 ) + MBEDTLS_SSL_DEBUG_MSG( 1, ( "cache did not store session" ) ); + } + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ssl->handshake->flight != NULL ) + { + /* Cancel handshake timer */ + ssl_set_timer( ssl, 0 ); + + /* Keep last flight around in case we need to resend it: + * we need the handshake and transform structures for that */ + MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip freeing handshake and transform" ) ); + } + else +#endif + ssl_handshake_wrapup_free_hs_transform( ssl ); + + ssl->state++; + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) ); +} + +int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl ) +{ + int ret, hash_len; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished" ) ); + + /* + * Set the out_msg pointer to the correct location based on IV length + */ + if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 ) + { + ssl->out_msg = ssl->out_iv + ssl->transform_negotiate->ivlen - + ssl->transform_negotiate->fixed_ivlen; + } + else + ssl->out_msg = ssl->out_iv; + + ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint ); + + /* + * RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites + * may define some other value. Currently (early 2016), no defined + * ciphersuite does this (and this is unlikely to change as activity has + * moved to TLS 1.3 now) so we can keep the hardcoded 12 here. + */ + hash_len = ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ? 36 : 12; + +#if defined(MBEDTLS_SSL_RENEGOTIATION) + ssl->verify_data_len = hash_len; + memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len ); +#endif + + ssl->out_msglen = 4 + hash_len; + ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; + ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED; + + /* + * In case of session resuming, invert the client and server + * ChangeCipherSpec messages order. + */ + if( ssl->handshake->resume != 0 ) + { +#if defined(MBEDTLS_SSL_CLI_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) + ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; +#endif +#if defined(MBEDTLS_SSL_SRV_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) + ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; +#endif + } + else + ssl->state++; + + /* + * Switch to our negotiated transform and session parameters for outbound + * data. + */ + MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) ); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + unsigned char i; + + /* Remember current epoch settings for resending */ + ssl->handshake->alt_transform_out = ssl->transform_out; + memcpy( ssl->handshake->alt_out_ctr, ssl->out_ctr, 8 ); + + /* Set sequence_number to zero */ + memset( ssl->out_ctr + 2, 0, 6 ); + + /* Increment epoch */ + for( i = 2; i > 0; i-- ) + if( ++ssl->out_ctr[i - 1] != 0 ) + break; + + /* The loop goes to its end iff the counter is wrapping */ + if( i == 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) ); + return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING ); + } + } + else +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + memset( ssl->out_ctr, 0, 8 ); + + ssl->transform_out = ssl->transform_negotiate; + ssl->session_out = ssl->session_negotiate; + +#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) + if( mbedtls_ssl_hw_record_activate != NULL ) + { + if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret ); + return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); + } + } +#endif + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + mbedtls_ssl_send_flight_completed( ssl ); +#endif + + if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); + return( ret ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished" ) ); + + return( 0 ); +} + +#if defined(MBEDTLS_SSL_PROTO_SSL3) +#define SSL_MAX_HASH_LEN 36 +#else +#define SSL_MAX_HASH_LEN 12 +#endif + +int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl ) +{ + int ret; + unsigned int hash_len; + unsigned char buf[SSL_MAX_HASH_LEN]; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) ); + + ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 ); + + if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); + return( ret ); + } + + if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); + return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); + } + + /* There is currently no ciphersuite using another length with TLS 1.2 */ +#if defined(MBEDTLS_SSL_PROTO_SSL3) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) + hash_len = 36; + else +#endif + hash_len = 12; + + if( ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED || + ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + hash_len ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED ); + } + + if( mbedtls_ssl_safer_memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), + buf, hash_len ) != 0 ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR ); + return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED ); + } + +#if defined(MBEDTLS_SSL_RENEGOTIATION) + ssl->verify_data_len = hash_len; + memcpy( ssl->peer_verify_data, buf, hash_len ); +#endif + + if( ssl->handshake->resume != 0 ) + { +#if defined(MBEDTLS_SSL_CLI_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) + ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC; +#endif +#if defined(MBEDTLS_SSL_SRV_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) + ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP; +#endif + } + else + ssl->state++; + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + mbedtls_ssl_recv_flight_completed( ssl ); +#endif + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) ); + + return( 0 ); +} + +static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake ) +{ + memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) ); + +#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_1) + mbedtls_md5_init( &handshake->fin_md5 ); + mbedtls_sha1_init( &handshake->fin_sha1 ); + mbedtls_md5_starts_ret( &handshake->fin_md5 ); + mbedtls_sha1_starts_ret( &handshake->fin_sha1 ); +#endif +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +#if defined(MBEDTLS_SHA256_C) + mbedtls_sha256_init( &handshake->fin_sha256 ); + mbedtls_sha256_starts_ret( &handshake->fin_sha256, 0 ); +#endif +#if defined(MBEDTLS_SHA512_C) + mbedtls_sha512_init( &handshake->fin_sha512 ); + mbedtls_sha512_starts_ret( &handshake->fin_sha512, 1 ); +#endif +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + + handshake->update_checksum = ssl_update_checksum_start; + +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ + defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) + mbedtls_ssl_sig_hash_set_init( &handshake->hash_algs ); +#endif + +#if defined(MBEDTLS_DHM_C) + mbedtls_dhm_init( &handshake->dhm_ctx ); +#endif +#if defined(MBEDTLS_ECDH_C) + mbedtls_ecdh_init( &handshake->ecdh_ctx ); +#endif +#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) + mbedtls_ecjpake_init( &handshake->ecjpake_ctx ); +#if defined(MBEDTLS_SSL_CLI_C) + handshake->ecjpake_cache = NULL; + handshake->ecjpake_cache_len = 0; +#endif +#endif + +#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) + handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET; +#endif +} + +static void ssl_transform_init( mbedtls_ssl_transform *transform ) +{ + memset( transform, 0, sizeof(mbedtls_ssl_transform) ); + + mbedtls_cipher_init( &transform->cipher_ctx_enc ); + mbedtls_cipher_init( &transform->cipher_ctx_dec ); + + mbedtls_md_init( &transform->md_ctx_enc ); + mbedtls_md_init( &transform->md_ctx_dec ); +} + +void mbedtls_ssl_session_init( mbedtls_ssl_session *session ) +{ + memset( session, 0, sizeof(mbedtls_ssl_session) ); +} + +static int ssl_handshake_init( mbedtls_ssl_context *ssl ) +{ + /* Clear old handshake information if present */ + if( ssl->transform_negotiate ) + mbedtls_ssl_transform_free( ssl->transform_negotiate ); + if( ssl->session_negotiate ) + mbedtls_ssl_session_free( ssl->session_negotiate ); + if( ssl->handshake ) + mbedtls_ssl_handshake_free( ssl->handshake ); + + /* + * Either the pointers are now NULL or cleared properly and can be freed. + * Now allocate missing structures. + */ + if( ssl->transform_negotiate == NULL ) + { + ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) ); + } + + if( ssl->session_negotiate == NULL ) + { + ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) ); + } + + if( ssl->handshake == NULL ) + { + ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) ); + } + + /* All pointers should exist and can be directly freed without issue */ + if( ssl->handshake == NULL || + ssl->transform_negotiate == NULL || + ssl->session_negotiate == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) ); + + mbedtls_free( ssl->handshake ); + mbedtls_free( ssl->transform_negotiate ); + mbedtls_free( ssl->session_negotiate ); + + ssl->handshake = NULL; + ssl->transform_negotiate = NULL; + ssl->session_negotiate = NULL; + + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + } + + /* Initialize structures */ + mbedtls_ssl_session_init( ssl->session_negotiate ); + ssl_transform_init( ssl->transform_negotiate ); + ssl_handshake_params_init( ssl->handshake ); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + ssl->handshake->alt_transform_out = ssl->transform_out; + + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) + ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING; + else + ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING; + + ssl_set_timer( ssl, 0 ); + } +#endif + + return( 0 ); +} + +#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) +/* Dummy cookie callbacks for defaults */ +static int ssl_cookie_write_dummy( void *ctx, + unsigned char **p, unsigned char *end, + const unsigned char *cli_id, size_t cli_id_len ) +{ + ((void) ctx); + ((void) p); + ((void) end); + ((void) cli_id); + ((void) cli_id_len); + + return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); +} + +static int ssl_cookie_check_dummy( void *ctx, + const unsigned char *cookie, size_t cookie_len, + const unsigned char *cli_id, size_t cli_id_len ) +{ + ((void) ctx); + ((void) cookie); + ((void) cookie_len); + ((void) cli_id); + ((void) cli_id_len); + + return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); +} +#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */ + +/* + * Initialize an SSL context + */ +void mbedtls_ssl_init( mbedtls_ssl_context *ssl ) +{ + memset( ssl, 0, sizeof( mbedtls_ssl_context ) ); +} + +/* + * Setup an SSL context + */ +int mbedtls_ssl_setup( mbedtls_ssl_context *ssl, + const mbedtls_ssl_config *conf ) +{ + int ret; + const size_t len = MBEDTLS_SSL_BUFFER_LEN; + + ssl->conf = conf; + + /* + * Prepare base structures + */ + if( ( ssl-> in_buf = mbedtls_calloc( 1, len ) ) == NULL || + ( ssl->out_buf = mbedtls_calloc( 1, len ) ) == NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", len ) ); + mbedtls_free( ssl->in_buf ); + ssl->in_buf = NULL; + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + } + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + ssl->out_hdr = ssl->out_buf; + ssl->out_ctr = ssl->out_buf + 3; + ssl->out_len = ssl->out_buf + 11; + ssl->out_iv = ssl->out_buf + 13; + ssl->out_msg = ssl->out_buf + 13; + + ssl->in_hdr = ssl->in_buf; + ssl->in_ctr = ssl->in_buf + 3; + ssl->in_len = ssl->in_buf + 11; + ssl->in_iv = ssl->in_buf + 13; + ssl->in_msg = ssl->in_buf + 13; + } + else +#endif + { + ssl->out_ctr = ssl->out_buf; + ssl->out_hdr = ssl->out_buf + 8; + ssl->out_len = ssl->out_buf + 11; + ssl->out_iv = ssl->out_buf + 13; + ssl->out_msg = ssl->out_buf + 13; + + ssl->in_ctr = ssl->in_buf; + ssl->in_hdr = ssl->in_buf + 8; + ssl->in_len = ssl->in_buf + 11; + ssl->in_iv = ssl->in_buf + 13; + ssl->in_msg = ssl->in_buf + 13; + } + + if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) + return( ret ); + + return( 0 ); +} + +/* + * Reset an initialized and used SSL context for re-use while retaining + * all application-set variables, function pointers and data. + * + * If partial is non-zero, keep data in the input buffer and client ID. + * (Use when a DTLS client reconnects from the same port.) + */ +static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial ) +{ + int ret; + + ssl->state = MBEDTLS_SSL_HELLO_REQUEST; + + /* Cancel any possibly running timer */ + ssl_set_timer( ssl, 0 ); + +#if defined(MBEDTLS_SSL_RENEGOTIATION) + ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE; + ssl->renego_records_seen = 0; + + ssl->verify_data_len = 0; + memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN ); + memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN ); +#endif + ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION; + + ssl->in_offt = NULL; + + ssl->in_msg = ssl->in_buf + 13; + ssl->in_msgtype = 0; + ssl->in_msglen = 0; + if( partial == 0 ) + ssl->in_left = 0; +#if defined(MBEDTLS_SSL_PROTO_DTLS) + ssl->next_record_offset = 0; + ssl->in_epoch = 0; +#endif +#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) + ssl_dtls_replay_reset( ssl ); +#endif + + ssl->in_hslen = 0; + ssl->nb_zero = 0; + + ssl->keep_current_message = 0; + + ssl->out_msg = ssl->out_buf + 13; + ssl->out_msgtype = 0; + ssl->out_msglen = 0; + ssl->out_left = 0; +#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) + if( ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED ) + ssl->split_done = 0; +#endif + + ssl->transform_in = NULL; + ssl->transform_out = NULL; + + memset( ssl->out_buf, 0, MBEDTLS_SSL_BUFFER_LEN ); + if( partial == 0 ) + memset( ssl->in_buf, 0, MBEDTLS_SSL_BUFFER_LEN ); + +#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) + if( mbedtls_ssl_hw_record_reset != NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_reset()" ) ); + if( ( ret = mbedtls_ssl_hw_record_reset( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_reset", ret ); + return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED ); + } + } +#endif + + if( ssl->transform ) + { + mbedtls_ssl_transform_free( ssl->transform ); + mbedtls_free( ssl->transform ); + ssl->transform = NULL; + } + + if( ssl->session ) + { + mbedtls_ssl_session_free( ssl->session ); + mbedtls_free( ssl->session ); + ssl->session = NULL; + } + +#if defined(MBEDTLS_SSL_ALPN) + ssl->alpn_chosen = NULL; +#endif + +#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) + if( partial == 0 ) + { + mbedtls_free( ssl->cli_id ); + ssl->cli_id = NULL; + ssl->cli_id_len = 0; + } +#endif + + if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) + return( ret ); + + return( 0 ); +} + +/* + * Reset an initialized and used SSL context for re-use while retaining + * all application-set variables, function pointers and data. + */ +int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl ) +{ + return( ssl_session_reset_int( ssl, 0 ) ); +} + +/* + * SSL set accessors + */ +void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint ) +{ + conf->endpoint = endpoint; +} + +void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport ) +{ + conf->transport = transport; +} + +#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) +void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode ) +{ + conf->anti_replay = mode; +} +#endif + +#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT) +void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit ) +{ + conf->badmac_limit = limit; +} +#endif + +#if defined(MBEDTLS_SSL_PROTO_DTLS) +void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf, uint32_t min, uint32_t max ) +{ + conf->hs_timeout_min = min; + conf->hs_timeout_max = max; +} +#endif + +void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode ) +{ + conf->authmode = authmode; +} + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf, + int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), + void *p_vrfy ) +{ + conf->f_vrfy = f_vrfy; + conf->p_vrfy = p_vrfy; +} +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf, + int (*f_rng)(void *, unsigned char *, size_t), + void *p_rng ) +{ + conf->f_rng = f_rng; + conf->p_rng = p_rng; +} + +void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf, + void (*f_dbg)(void *, int, const char *, int, const char *), + void *p_dbg ) +{ + conf->f_dbg = f_dbg; + conf->p_dbg = p_dbg; +} + +void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl, + void *p_bio, + mbedtls_ssl_send_t *f_send, + mbedtls_ssl_recv_t *f_recv, + mbedtls_ssl_recv_timeout_t *f_recv_timeout ) +{ + ssl->p_bio = p_bio; + ssl->f_send = f_send; + ssl->f_recv = f_recv; + ssl->f_recv_timeout = f_recv_timeout; +} + +void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout ) +{ + conf->read_timeout = timeout; +} + +void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl, + void *p_timer, + mbedtls_ssl_set_timer_t *f_set_timer, + mbedtls_ssl_get_timer_t *f_get_timer ) +{ + ssl->p_timer = p_timer; + ssl->f_set_timer = f_set_timer; + ssl->f_get_timer = f_get_timer; + + /* Make sure we start with no timer running */ + ssl_set_timer( ssl, 0 ); +} + +#if defined(MBEDTLS_SSL_SRV_C) +void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf, + void *p_cache, + int (*f_get_cache)(void *, mbedtls_ssl_session *), + int (*f_set_cache)(void *, const mbedtls_ssl_session *) ) +{ + conf->p_cache = p_cache; + conf->f_get_cache = f_get_cache; + conf->f_set_cache = f_set_cache; +} +#endif /* MBEDTLS_SSL_SRV_C */ + +#if defined(MBEDTLS_SSL_CLI_C) +int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session ) +{ + int ret; + + if( ssl == NULL || + session == NULL || + ssl->session_negotiate == NULL || + ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT ) + { + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + if( ( ret = ssl_session_copy( ssl->session_negotiate, session ) ) != 0 ) + return( ret ); + + ssl->handshake->resume = 1; + + return( 0 ); +} +#endif /* MBEDTLS_SSL_CLI_C */ + +void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf, + const int *ciphersuites ) +{ + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites; + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites; + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites; + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites; +} + +void mbedtls_ssl_conf_ciphersuites_for_version( mbedtls_ssl_config *conf, + const int *ciphersuites, + int major, int minor ) +{ + if( major != MBEDTLS_SSL_MAJOR_VERSION_3 ) + return; + + if( minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3 ) + return; + + conf->ciphersuite_list[minor] = ciphersuites; +} + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf, + const mbedtls_x509_crt_profile *profile ) +{ + conf->cert_profile = profile; +} + +/* Append a new keycert entry to a (possibly empty) list */ +static int ssl_append_key_cert( mbedtls_ssl_key_cert **head, + mbedtls_x509_crt *cert, + mbedtls_pk_context *key ) +{ + mbedtls_ssl_key_cert *new; + + new = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) ); + if( new == NULL ) + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + + new->cert = cert; + new->key = key; + new->next = NULL; + + /* Update head is the list was null, else add to the end */ + if( *head == NULL ) + { + *head = new; + } + else + { + mbedtls_ssl_key_cert *cur = *head; + while( cur->next != NULL ) + cur = cur->next; + cur->next = new; + } + + return( 0 ); +} + +int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf, + mbedtls_x509_crt *own_cert, + mbedtls_pk_context *pk_key ) +{ + return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) ); +} + +void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf, + mbedtls_x509_crt *ca_chain, + mbedtls_x509_crl *ca_crl ) +{ + conf->ca_chain = ca_chain; + conf->ca_crl = ca_crl; +} +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) +int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl, + mbedtls_x509_crt *own_cert, + mbedtls_pk_context *pk_key ) +{ + return( ssl_append_key_cert( &ssl->handshake->sni_key_cert, + own_cert, pk_key ) ); +} + +void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl, + mbedtls_x509_crt *ca_chain, + mbedtls_x509_crl *ca_crl ) +{ + ssl->handshake->sni_ca_chain = ca_chain; + ssl->handshake->sni_ca_crl = ca_crl; +} + +void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl, + int authmode ) +{ + ssl->handshake->sni_authmode = authmode; +} +#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ + +#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) +/* + * Set EC J-PAKE password for current handshake + */ +int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl, + const unsigned char *pw, + size_t pw_len ) +{ + mbedtls_ecjpake_role role; + + if( ssl->handshake == NULL || ssl->conf == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) + role = MBEDTLS_ECJPAKE_SERVER; + else + role = MBEDTLS_ECJPAKE_CLIENT; + + return( mbedtls_ecjpake_setup( &ssl->handshake->ecjpake_ctx, + role, + MBEDTLS_MD_SHA256, + MBEDTLS_ECP_DP_SECP256R1, + pw, pw_len ) ); +} +#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */ + +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) +int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf, + const unsigned char *psk, size_t psk_len, + const unsigned char *psk_identity, size_t psk_identity_len ) +{ + if( psk == NULL || psk_identity == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + if( psk_len > MBEDTLS_PSK_MAX_LEN ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + /* Identity len will be encoded on two bytes */ + if( ( psk_identity_len >> 16 ) != 0 || + psk_identity_len > MBEDTLS_SSL_MAX_CONTENT_LEN ) + { + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + if( conf->psk != NULL ) + { + mbedtls_zeroize( conf->psk, conf->psk_len ); + + mbedtls_free( conf->psk ); + conf->psk = NULL; + conf->psk_len = 0; + } + if( conf->psk_identity != NULL ) + { + mbedtls_free( conf->psk_identity ); + conf->psk_identity = NULL; + conf->psk_identity_len = 0; + } + + if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL || + ( conf->psk_identity = mbedtls_calloc( 1, psk_identity_len ) ) == NULL ) + { + mbedtls_free( conf->psk ); + mbedtls_free( conf->psk_identity ); + conf->psk = NULL; + conf->psk_identity = NULL; + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + } + + conf->psk_len = psk_len; + conf->psk_identity_len = psk_identity_len; + + memcpy( conf->psk, psk, conf->psk_len ); + memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len ); + + return( 0 ); +} + +int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl, + const unsigned char *psk, size_t psk_len ) +{ + if( psk == NULL || ssl->handshake == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + if( psk_len > MBEDTLS_PSK_MAX_LEN ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + if( ssl->handshake->psk != NULL ) + { + mbedtls_zeroize( ssl->handshake->psk, ssl->handshake->psk_len ); + mbedtls_free( ssl->handshake->psk ); + ssl->handshake->psk_len = 0; + } + + if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ) + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + + ssl->handshake->psk_len = psk_len; + memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len ); + + return( 0 ); +} + +void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf, + int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *, + size_t), + void *p_psk ) +{ + conf->f_psk = f_psk; + conf->p_psk = p_psk; +} +#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */ + +#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) + +#if !defined(MBEDTLS_DEPRECATED_REMOVED) +int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G ) +{ + int ret; + + if( ( ret = mbedtls_mpi_read_string( &conf->dhm_P, 16, dhm_P ) ) != 0 || + ( ret = mbedtls_mpi_read_string( &conf->dhm_G, 16, dhm_G ) ) != 0 ) + { + mbedtls_mpi_free( &conf->dhm_P ); + mbedtls_mpi_free( &conf->dhm_G ); + return( ret ); + } + + return( 0 ); +} +#endif /* MBEDTLS_DEPRECATED_REMOVED */ + +int mbedtls_ssl_conf_dh_param_bin( mbedtls_ssl_config *conf, + const unsigned char *dhm_P, size_t P_len, + const unsigned char *dhm_G, size_t G_len ) +{ + int ret; + + if( ( ret = mbedtls_mpi_read_binary( &conf->dhm_P, dhm_P, P_len ) ) != 0 || + ( ret = mbedtls_mpi_read_binary( &conf->dhm_G, dhm_G, G_len ) ) != 0 ) + { + mbedtls_mpi_free( &conf->dhm_P ); + mbedtls_mpi_free( &conf->dhm_G ); + return( ret ); + } + + return( 0 ); +} + +int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx ) +{ + int ret; + + if( ( ret = mbedtls_mpi_copy( &conf->dhm_P, &dhm_ctx->P ) ) != 0 || + ( ret = mbedtls_mpi_copy( &conf->dhm_G, &dhm_ctx->G ) ) != 0 ) + { + mbedtls_mpi_free( &conf->dhm_P ); + mbedtls_mpi_free( &conf->dhm_G ); + return( ret ); + } + + return( 0 ); +} +#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */ + +#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) +/* + * Set the minimum length for Diffie-Hellman parameters + */ +void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf, + unsigned int bitlen ) +{ + conf->dhm_min_bitlen = bitlen; +} +#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */ + +#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) +/* + * Set allowed/preferred hashes for handshake signatures + */ +void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf, + const int *hashes ) +{ + conf->sig_hashes = hashes; +} +#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ + +#if defined(MBEDTLS_ECP_C) +/* + * Set the allowed elliptic curves + */ +void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf, + const mbedtls_ecp_group_id *curve_list ) +{ + conf->curve_list = curve_list; +} +#endif /* MBEDTLS_ECP_C */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname ) +{ + /* Initialize to suppress unnecessary compiler warning */ + size_t hostname_len = 0; + + /* Check if new hostname is valid before + * making any change to current one */ + if( hostname != NULL ) + { + hostname_len = strlen( hostname ); + + if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + /* Now it's clear that we will overwrite the old hostname, + * so we can free it safely */ + + if( ssl->hostname != NULL ) + { + mbedtls_zeroize( ssl->hostname, strlen( ssl->hostname ) ); + mbedtls_free( ssl->hostname ); + } + + /* Passing NULL as hostname shall clear the old one */ + + if( hostname == NULL ) + { + ssl->hostname = NULL; + } + else + { + ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 ); + if( ssl->hostname == NULL ) + return( MBEDTLS_ERR_SSL_ALLOC_FAILED ); + + memcpy( ssl->hostname, hostname, hostname_len ); + + ssl->hostname[hostname_len] = '\0'; + } + + return( 0 ); +} +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) +void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf, + int (*f_sni)(void *, mbedtls_ssl_context *, + const unsigned char *, size_t), + void *p_sni ) +{ + conf->f_sni = f_sni; + conf->p_sni = p_sni; +} +#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */ + +#if defined(MBEDTLS_SSL_ALPN) +int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos ) +{ + size_t cur_len, tot_len; + const char **p; + + /* + * RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings + * MUST NOT be truncated." + * We check lengths now rather than later. + */ + tot_len = 0; + for( p = protos; *p != NULL; p++ ) + { + cur_len = strlen( *p ); + tot_len += cur_len; + + if( cur_len == 0 || cur_len > 255 || tot_len > 65535 ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + conf->alpn_list = protos; + + return( 0 ); +} + +const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl ) +{ + return( ssl->alpn_chosen ); +} +#endif /* MBEDTLS_SSL_ALPN */ + +void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor ) +{ + conf->max_major_ver = major; + conf->max_minor_ver = minor; +} + +void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor ) +{ + conf->min_major_ver = major; + conf->min_minor_ver = minor; +} + +#if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C) +void mbedtls_ssl_conf_fallback( mbedtls_ssl_config *conf, char fallback ) +{ + conf->fallback = fallback; +} +#endif + +#if defined(MBEDTLS_SSL_SRV_C) +void mbedtls_ssl_conf_cert_req_ca_list( mbedtls_ssl_config *conf, + char cert_req_ca_list ) +{ + conf->cert_req_ca_list = cert_req_ca_list; +} +#endif + +#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) +void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm ) +{ + conf->encrypt_then_mac = etm; +} +#endif + +#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) +void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems ) +{ + conf->extended_ms = ems; +} +#endif + +#if defined(MBEDTLS_ARC4_C) +void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 ) +{ + conf->arc4_disabled = arc4; +} +#endif + +#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) +int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code ) +{ + if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID || + mfl_code_to_length[mfl_code] > MBEDTLS_SSL_MAX_CONTENT_LEN ) + { + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + conf->mfl_code = mfl_code; + + return( 0 ); +} +#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ + +#if defined(MBEDTLS_SSL_TRUNCATED_HMAC) +void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate ) +{ + conf->trunc_hmac = truncate; +} +#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */ + +#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) +void mbedtls_ssl_conf_cbc_record_splitting( mbedtls_ssl_config *conf, char split ) +{ + conf->cbc_record_splitting = split; +} +#endif + +void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy ) +{ + conf->allow_legacy_renegotiation = allow_legacy; +} + +#if defined(MBEDTLS_SSL_RENEGOTIATION) +void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation ) +{ + conf->disable_renegotiation = renegotiation; +} + +void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records ) +{ + conf->renego_max_records = max_records; +} + +void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf, + const unsigned char period[8] ) +{ + memcpy( conf->renego_period, period, 8 ); +} +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + +#if defined(MBEDTLS_SSL_SESSION_TICKETS) +#if defined(MBEDTLS_SSL_CLI_C) +void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets ) +{ + conf->session_tickets = use_tickets; +} +#endif + +#if defined(MBEDTLS_SSL_SRV_C) +void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf, + mbedtls_ssl_ticket_write_t *f_ticket_write, + mbedtls_ssl_ticket_parse_t *f_ticket_parse, + void *p_ticket ) +{ + conf->f_ticket_write = f_ticket_write; + conf->f_ticket_parse = f_ticket_parse; + conf->p_ticket = p_ticket; +} +#endif +#endif /* MBEDTLS_SSL_SESSION_TICKETS */ + +#if defined(MBEDTLS_SSL_EXPORT_KEYS) +void mbedtls_ssl_conf_export_keys_cb( mbedtls_ssl_config *conf, + mbedtls_ssl_export_keys_t *f_export_keys, + void *p_export_keys ) +{ + conf->f_export_keys = f_export_keys; + conf->p_export_keys = p_export_keys; +} +#endif + +/* + * SSL get accessors + */ +size_t mbedtls_ssl_get_bytes_avail( const mbedtls_ssl_context *ssl ) +{ + return( ssl->in_offt == NULL ? 0 : ssl->in_msglen ); +} + +uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl ) +{ + if( ssl->session != NULL ) + return( ssl->session->verify_result ); + + if( ssl->session_negotiate != NULL ) + return( ssl->session_negotiate->verify_result ); + + return( 0xFFFFFFFF ); +} + +const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl ) +{ + if( ssl == NULL || ssl->session == NULL ) + return( NULL ); + + return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite ); +} + +const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl ) +{ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + switch( ssl->minor_ver ) + { + case MBEDTLS_SSL_MINOR_VERSION_2: + return( "DTLSv1.0" ); + + case MBEDTLS_SSL_MINOR_VERSION_3: + return( "DTLSv1.2" ); + + default: + return( "unknown (DTLS)" ); + } + } +#endif + + switch( ssl->minor_ver ) + { + case MBEDTLS_SSL_MINOR_VERSION_0: + return( "SSLv3.0" ); + + case MBEDTLS_SSL_MINOR_VERSION_1: + return( "TLSv1.0" ); + + case MBEDTLS_SSL_MINOR_VERSION_2: + return( "TLSv1.1" ); + + case MBEDTLS_SSL_MINOR_VERSION_3: + return( "TLSv1.2" ); + + default: + return( "unknown" ); + } +} + +int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl ) +{ + size_t transform_expansion; + const mbedtls_ssl_transform *transform = ssl->transform_out; + +#if defined(MBEDTLS_ZLIB_SUPPORT) + if( ssl->session_out->compression != MBEDTLS_SSL_COMPRESS_NULL ) + return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE ); +#endif + + if( transform == NULL ) + return( (int) mbedtls_ssl_hdr_len( ssl ) ); + + switch( mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ) ) + { + case MBEDTLS_MODE_GCM: + case MBEDTLS_MODE_CCM: + case MBEDTLS_MODE_STREAM: + transform_expansion = transform->minlen; + break; + + case MBEDTLS_MODE_CBC: + transform_expansion = transform->maclen + + mbedtls_cipher_get_block_size( &transform->cipher_ctx_enc ); + break; + + default: + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + + return( (int)( mbedtls_ssl_hdr_len( ssl ) + transform_expansion ) ); +} + +#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) +size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl ) +{ + size_t max_len; + + /* + * Assume mfl_code is correct since it was checked when set + */ + max_len = mfl_code_to_length[ssl->conf->mfl_code]; + + /* + * Check if a smaller max length was negotiated + */ + if( ssl->session_out != NULL && + mfl_code_to_length[ssl->session_out->mfl_code] < max_len ) + { + max_len = mfl_code_to_length[ssl->session_out->mfl_code]; + } + + return max_len; +} +#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl ) +{ + if( ssl == NULL || ssl->session == NULL ) + return( NULL ); + + return( ssl->session->peer_cert ); +} +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +#if defined(MBEDTLS_SSL_CLI_C) +int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl, mbedtls_ssl_session *dst ) +{ + if( ssl == NULL || + dst == NULL || + ssl->session == NULL || + ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT ) + { + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + + return( ssl_session_copy( dst, ssl->session ) ); +} +#endif /* MBEDTLS_SSL_CLI_C */ + +/* + * Perform a single step of the SSL handshake + */ +int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl ) +{ + int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; + + if( ssl == NULL || ssl->conf == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + +#if defined(MBEDTLS_SSL_CLI_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) + ret = mbedtls_ssl_handshake_client_step( ssl ); +#endif +#if defined(MBEDTLS_SSL_SRV_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) + ret = mbedtls_ssl_handshake_server_step( ssl ); +#endif + + return( ret ); +} + +/* + * Perform the SSL handshake + */ +int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl ) +{ + int ret = 0; + + if( ssl == NULL || ssl->conf == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) ); + + while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) + { + ret = mbedtls_ssl_handshake_step( ssl ); + + if( ret != 0 ) + break; + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) ); + + return( ret ); +} + +#if defined(MBEDTLS_SSL_RENEGOTIATION) +#if defined(MBEDTLS_SSL_SRV_C) +/* + * Write HelloRequest to request renegotiation on server + */ +static int ssl_write_hello_request( mbedtls_ssl_context *ssl ) +{ + int ret; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) ); + + ssl->out_msglen = 4; + ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE; + ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST; + + if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); + return( ret ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) ); + + return( 0 ); +} +#endif /* MBEDTLS_SSL_SRV_C */ + +/* + * Actually renegotiate current connection, triggered by either: + * - any side: calling mbedtls_ssl_renegotiate(), + * - client: receiving a HelloRequest during mbedtls_ssl_read(), + * - server: receiving any handshake message on server during mbedtls_ssl_read() after + * the initial handshake is completed. + * If the handshake doesn't complete due to waiting for I/O, it will continue + * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively. + */ +static int ssl_start_renegotiation( mbedtls_ssl_context *ssl ) +{ + int ret; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) ); + + if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) + return( ret ); + + /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and + * the ServerHello will have message_seq = 1" */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) + { + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) + ssl->handshake->out_msg_seq = 1; + else + ssl->handshake->in_msg_seq = 1; + } +#endif + + ssl->state = MBEDTLS_SSL_HELLO_REQUEST; + ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS; + + if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); + return( ret ); + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) ); + + return( 0 ); +} + +/* + * Renegotiate current connection on client, + * or request renegotiation on server + */ +int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl ) +{ + int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE; + + if( ssl == NULL || ssl->conf == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + +#if defined(MBEDTLS_SSL_SRV_C) + /* On server, just send the request */ + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER ) + { + if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING; + + /* Did we already try/start sending HelloRequest? */ + if( ssl->out_left != 0 ) + return( mbedtls_ssl_flush_output( ssl ) ); + + return( ssl_write_hello_request( ssl ) ); + } +#endif /* MBEDTLS_SSL_SRV_C */ + +#if defined(MBEDTLS_SSL_CLI_C) + /* + * On client, either start the renegotiation process or, + * if already in progress, continue the handshake + */ + if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS ) + { + if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret ); + return( ret ); + } + } + else + { + if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); + return( ret ); + } + } +#endif /* MBEDTLS_SSL_CLI_C */ + + return( ret ); +} + +/* + * Check record counters and renegotiate if they're above the limit. + */ +static int ssl_check_ctr_renegotiate( mbedtls_ssl_context *ssl ) +{ + size_t ep_len = ssl_ep_len( ssl ); + int in_ctr_cmp; + int out_ctr_cmp; + + if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER || + ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING || + ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED ) + { + return( 0 ); + } + + in_ctr_cmp = memcmp( ssl->in_ctr + ep_len, + ssl->conf->renego_period + ep_len, 8 - ep_len ); + out_ctr_cmp = memcmp( ssl->out_ctr + ep_len, + ssl->conf->renego_period + ep_len, 8 - ep_len ); + + if( in_ctr_cmp <= 0 && out_ctr_cmp <= 0 ) + { + return( 0 ); + } + + MBEDTLS_SSL_DEBUG_MSG( 1, ( "record counter limit reached: renegotiate" ) ); + return( mbedtls_ssl_renegotiate( ssl ) ); +} +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + +/* + * Receive application data decrypted from the SSL layer + */ +int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len ) +{ + int ret; + size_t n; + + if( ssl == NULL || ssl->conf == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read" ) ); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) + return( ret ); + + if( ssl->handshake != NULL && + ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING ) + { + if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 ) + return( ret ); + } + } +#endif + + /* + * Check if renegotiation is necessary and/or handshake is + * in process. If yes, perform/continue, and fall through + * if an unexpected packet is received while the client + * is waiting for the ServerHello. + * + * (There is no equivalent to the last condition on + * the server-side as it is not treated as within + * a handshake while waiting for the ClientHello + * after a renegotiation request.) + */ + +#if defined(MBEDTLS_SSL_RENEGOTIATION) + ret = ssl_check_ctr_renegotiate( ssl ); + if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO && + ret != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret ); + return( ret ); + } +#endif + + if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) + { + ret = mbedtls_ssl_handshake( ssl ); + if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO && + ret != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); + return( ret ); + } + } + + /* + * TODO + * + * The logic should be streamlined here: + * + * Instead of + * + * - Manually checking whether ssl->in_offt is NULL + * - Fetching a new record if yes + * - Setting ssl->in_offt if one finds an application record + * - Resetting keep_current_message after handling the application data + * + * one should + * + * - Adapt read_record to set ssl->in_offt automatically + * when a new application data record is processed. + * - Always call mbedtls_ssl_read_record here. + * + * This way, the logic of ssl_read would be much clearer: + * + * (1) Always call record layer and see what kind of record is on + * and have it ready for consumption (in particular, in_offt + * properly set for application data records). + * (2) If it's application data (either freshly fetched + * or something already being partially processed), + * serve the read request from it. + * (3) If it's something different from application data, + * handle it accordingly, e.g. potentially start a + * renegotiation. + * + * This will also remove the need to manually reset + * ssl->keep_current_message = 0 below. + * + */ + + if( ssl->in_offt == NULL ) + { + /* Start timer if not already running */ + if( ssl->f_get_timer != NULL && + ssl->f_get_timer( ssl->p_timer ) == -1 ) + { + ssl_set_timer( ssl, ssl->conf->read_timeout ); + } + + if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 ) + { + if( ret == MBEDTLS_ERR_SSL_CONN_EOF ) + return( 0 ); + + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); + return( ret ); + } + + if( ssl->in_msglen == 0 && + ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA ) + { + /* + * OpenSSL sends empty messages to randomize the IV + */ + if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 ) + { + if( ret == MBEDTLS_ERR_SSL_CONN_EOF ) + return( 0 ); + + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret ); + return( ret ); + } + } + + if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "received handshake message" ) ); + + /* + * - For client-side, expect SERVER_HELLO_REQUEST. + * - For server-side, expect CLIENT_HELLO. + * - Fail (TLS) or silently drop record (DTLS) in other cases. + */ + +#if defined(MBEDTLS_SSL_CLI_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT && + ( ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST || + ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) ) ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not HelloRequest)" ) ); + + /* With DTLS, drop the packet (probably from last handshake) */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + return( MBEDTLS_ERR_SSL_WANT_READ ); +#endif + return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); + } +#endif /* MBEDTLS_SSL_CLI_C */ + +#if defined(MBEDTLS_SSL_SRV_C) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && + ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not ClientHello)" ) ); + + /* With DTLS, drop the packet (probably from last handshake) */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + return( MBEDTLS_ERR_SSL_WANT_READ ); +#endif + return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); + } +#endif /* MBEDTLS_SSL_SRV_C */ + +#if defined(MBEDTLS_SSL_RENEGOTIATION) + /* Determine whether renegotiation attempt should be accepted */ + if( ! ( ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED || + ( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION && + ssl->conf->allow_legacy_renegotiation == + MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) ) ) + { + /* + * Accept renegotiation request + */ + + /* DTLS clients need to know renego is server-initiated */ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM && + ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT ) + { + ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING; + } +#endif + ret = ssl_start_renegotiation( ssl ); + if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO && + ret != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret ); + return( ret ); + } + } + else +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + { + /* + * Refuse renegotiation + */ + + MBEDTLS_SSL_DEBUG_MSG( 3, ( "refusing renegotiation, sending alert" ) ); + +#if defined(MBEDTLS_SSL_PROTO_SSL3) + if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) + { + /* SSLv3 does not have a "no_renegotiation" warning, so + we send a fatal alert and abort the connection. */ + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ); + return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); + } + else +#endif /* MBEDTLS_SSL_PROTO_SSL3 */ +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_2) + if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 ) + { + if( ( ret = mbedtls_ssl_send_alert_message( ssl, + MBEDTLS_SSL_ALERT_LEVEL_WARNING, + MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) ) != 0 ) + { + return( ret ); + } + } + else +#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || + MBEDTLS_SSL_PROTO_TLS1_2 */ + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) ); + return( MBEDTLS_ERR_SSL_INTERNAL_ERROR ); + } + } + + return( MBEDTLS_ERR_SSL_WANT_READ ); + } +#if defined(MBEDTLS_SSL_RENEGOTIATION) + else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) + { + if( ssl->conf->renego_max_records >= 0 ) + { + if( ++ssl->renego_records_seen > ssl->conf->renego_max_records ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, " + "but not honored by client" ) ); + return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); + } + } + } +#endif /* MBEDTLS_SSL_RENEGOTIATION */ + + /* Fatal and closure alerts handled by mbedtls_ssl_read_record() */ + if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "ignoring non-fatal non-closure alert" ) ); + return( MBEDTLS_ERR_SSL_WANT_READ ); + } + + if( ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad application data message" ) ); + return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE ); + } + + ssl->in_offt = ssl->in_msg; + + /* We're going to return something now, cancel timer, + * except if handshake (renegotiation) is in progress */ + if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) + ssl_set_timer( ssl, 0 ); + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + /* If we requested renego but received AppData, resend HelloRequest. + * Do it now, after setting in_offt, to avoid taking this branch + * again if ssl_write_hello_request() returns WANT_WRITE */ +#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION) + if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER && + ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ) + { + if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret ); + return( ret ); + } + } +#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */ +#endif /* MBEDTLS_SSL_PROTO_DTLS */ + } + + n = ( len < ssl->in_msglen ) + ? len : ssl->in_msglen; + + memcpy( buf, ssl->in_offt, n ); + ssl->in_msglen -= n; + + if( ssl->in_msglen == 0 ) + { + /* all bytes consumed */ + ssl->in_offt = NULL; + ssl->keep_current_message = 0; + } + else + { + /* more data available */ + ssl->in_offt += n; + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read" ) ); + + return( (int) n ); +} + +/* + * Send application data to be encrypted by the SSL layer, + * taking care of max fragment length and buffer size + */ +static int ssl_write_real( mbedtls_ssl_context *ssl, + const unsigned char *buf, size_t len ) +{ + int ret; +#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH) + size_t max_len = mbedtls_ssl_get_max_frag_len( ssl ); +#else + size_t max_len = MBEDTLS_SSL_MAX_CONTENT_LEN; +#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */ + if( len > max_len ) + { +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment larger than the (negotiated) " + "maximum fragment length: %d > %d", + len, max_len ) ); + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + } + else +#endif + len = max_len; + } + + if( ssl->out_left != 0 ) + { + if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret ); + return( ret ); + } + } + else + { + ssl->out_msglen = len; + ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA; + memcpy( ssl->out_msg, buf, len ); + + if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret ); + return( ret ); + } + } + + return( (int) len ); +} + +/* + * Write application data, doing 1/n-1 splitting if necessary. + * + * With non-blocking I/O, ssl_write_real() may return WANT_WRITE, + * then the caller will call us again with the same arguments, so + * remember whether we already did the split or not. + */ +#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) +static int ssl_write_split( mbedtls_ssl_context *ssl, + const unsigned char *buf, size_t len ) +{ + int ret; + + if( ssl->conf->cbc_record_splitting == + MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED || + len <= 1 || + ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_1 || + mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc ) + != MBEDTLS_MODE_CBC ) + { + return( ssl_write_real( ssl, buf, len ) ); + } + + if( ssl->split_done == 0 ) + { + if( ( ret = ssl_write_real( ssl, buf, 1 ) ) <= 0 ) + return( ret ); + ssl->split_done = 1; + } + + if( ( ret = ssl_write_real( ssl, buf + 1, len - 1 ) ) <= 0 ) + return( ret ); + ssl->split_done = 0; + + return( ret + 1 ); +} +#endif /* MBEDTLS_SSL_CBC_RECORD_SPLITTING */ + +/* + * Write application data (public-facing wrapper) + */ +int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len ) +{ + int ret; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write" ) ); + + if( ssl == NULL || ssl->conf == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + +#if defined(MBEDTLS_SSL_RENEGOTIATION) + if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret ); + return( ret ); + } +#endif + + if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ) + { + if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret ); + return( ret ); + } + } + +#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) + ret = ssl_write_split( ssl, buf, len ); +#else + ret = ssl_write_real( ssl, buf, len ); +#endif + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write" ) ); + + return( ret ); +} + +/* + * Notify the peer that the connection is being closed + */ +int mbedtls_ssl_close_notify( mbedtls_ssl_context *ssl ) +{ + int ret; + + if( ssl == NULL || ssl->conf == NULL ) + return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write close notify" ) ); + + if( ssl->out_left != 0 ) + return( mbedtls_ssl_flush_output( ssl ) ); + + if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER ) + { + if( ( ret = mbedtls_ssl_send_alert_message( ssl, + MBEDTLS_SSL_ALERT_LEVEL_WARNING, + MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_send_alert_message", ret ); + return( ret ); + } + } + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write close notify" ) ); + + return( 0 ); +} + +void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform ) +{ + if( transform == NULL ) + return; + +#if defined(MBEDTLS_ZLIB_SUPPORT) + deflateEnd( &transform->ctx_deflate ); + inflateEnd( &transform->ctx_inflate ); +#endif + + mbedtls_cipher_free( &transform->cipher_ctx_enc ); + mbedtls_cipher_free( &transform->cipher_ctx_dec ); + + mbedtls_md_free( &transform->md_ctx_enc ); + mbedtls_md_free( &transform->md_ctx_dec ); + + mbedtls_zeroize( transform, sizeof( mbedtls_ssl_transform ) ); +} + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert ) +{ + mbedtls_ssl_key_cert *cur = key_cert, *next; + + while( cur != NULL ) + { + next = cur->next; + mbedtls_free( cur ); + cur = next; + } +} +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +void mbedtls_ssl_handshake_free( mbedtls_ssl_handshake_params *handshake ) +{ + if( handshake == NULL ) + return; + +#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_1) + mbedtls_md5_free( &handshake->fin_md5 ); + mbedtls_sha1_free( &handshake->fin_sha1 ); +#endif +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) +#if defined(MBEDTLS_SHA256_C) + mbedtls_sha256_free( &handshake->fin_sha256 ); +#endif +#if defined(MBEDTLS_SHA512_C) + mbedtls_sha512_free( &handshake->fin_sha512 ); +#endif +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ + +#if defined(MBEDTLS_DHM_C) + mbedtls_dhm_free( &handshake->dhm_ctx ); +#endif +#if defined(MBEDTLS_ECDH_C) + mbedtls_ecdh_free( &handshake->ecdh_ctx ); +#endif +#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) + mbedtls_ecjpake_free( &handshake->ecjpake_ctx ); +#if defined(MBEDTLS_SSL_CLI_C) + mbedtls_free( handshake->ecjpake_cache ); + handshake->ecjpake_cache = NULL; + handshake->ecjpake_cache_len = 0; +#endif +#endif + +#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \ + defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED) + /* explicit void pointer cast for buggy MS compiler */ + mbedtls_free( (void *) handshake->curves ); +#endif + +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) + if( handshake->psk != NULL ) + { + mbedtls_zeroize( handshake->psk, handshake->psk_len ); + mbedtls_free( handshake->psk ); + } +#endif + +#if defined(MBEDTLS_X509_CRT_PARSE_C) && \ + defined(MBEDTLS_SSL_SERVER_NAME_INDICATION) + /* + * Free only the linked list wrapper, not the keys themselves + * since the belong to the SNI callback + */ + if( handshake->sni_key_cert != NULL ) + { + mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next; + + while( cur != NULL ) + { + next = cur->next; + mbedtls_free( cur ); + cur = next; + } + } +#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */ + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + mbedtls_free( handshake->verify_cookie ); + mbedtls_free( handshake->hs_msg ); + ssl_flight_free( handshake->flight ); +#endif + + mbedtls_zeroize( handshake, sizeof( mbedtls_ssl_handshake_params ) ); +} + +void mbedtls_ssl_session_free( mbedtls_ssl_session *session ) +{ + if( session == NULL ) + return; + +#if defined(MBEDTLS_X509_CRT_PARSE_C) + if( session->peer_cert != NULL ) + { + mbedtls_x509_crt_free( session->peer_cert ); + mbedtls_free( session->peer_cert ); + } +#endif + +#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C) + mbedtls_free( session->ticket ); +#endif + + mbedtls_zeroize( session, sizeof( mbedtls_ssl_session ) ); +} + +/* + * Free an SSL context + */ +void mbedtls_ssl_free( mbedtls_ssl_context *ssl ) +{ + if( ssl == NULL ) + return; + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> free" ) ); + + if( ssl->out_buf != NULL ) + { + mbedtls_zeroize( ssl->out_buf, MBEDTLS_SSL_BUFFER_LEN ); + mbedtls_free( ssl->out_buf ); + } + + if( ssl->in_buf != NULL ) + { + mbedtls_zeroize( ssl->in_buf, MBEDTLS_SSL_BUFFER_LEN ); + mbedtls_free( ssl->in_buf ); + } + +#if defined(MBEDTLS_ZLIB_SUPPORT) + if( ssl->compress_buf != NULL ) + { + mbedtls_zeroize( ssl->compress_buf, MBEDTLS_SSL_BUFFER_LEN ); + mbedtls_free( ssl->compress_buf ); + } +#endif + + if( ssl->transform ) + { + mbedtls_ssl_transform_free( ssl->transform ); + mbedtls_free( ssl->transform ); + } + + if( ssl->handshake ) + { + mbedtls_ssl_handshake_free( ssl->handshake ); + mbedtls_ssl_transform_free( ssl->transform_negotiate ); + mbedtls_ssl_session_free( ssl->session_negotiate ); + + mbedtls_free( ssl->handshake ); + mbedtls_free( ssl->transform_negotiate ); + mbedtls_free( ssl->session_negotiate ); + } + + if( ssl->session ) + { + mbedtls_ssl_session_free( ssl->session ); + mbedtls_free( ssl->session ); + } + +#if defined(MBEDTLS_X509_CRT_PARSE_C) + if( ssl->hostname != NULL ) + { + mbedtls_zeroize( ssl->hostname, strlen( ssl->hostname ) ); + mbedtls_free( ssl->hostname ); + } +#endif + +#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL) + if( mbedtls_ssl_hw_record_finish != NULL ) + { + MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_finish()" ) ); + mbedtls_ssl_hw_record_finish( ssl ); + } +#endif + +#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) + mbedtls_free( ssl->cli_id ); +#endif + + MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) ); + + /* Actually clear after last debug message */ + mbedtls_zeroize( ssl, sizeof( mbedtls_ssl_context ) ); +} + +/* + * Initialze mbedtls_ssl_config + */ +void mbedtls_ssl_config_init( mbedtls_ssl_config *conf ) +{ + memset( conf, 0, sizeof( mbedtls_ssl_config ) ); +} + +#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) +static int ssl_preset_default_hashes[] = { +#if defined(MBEDTLS_SHA512_C) + MBEDTLS_MD_SHA512, + MBEDTLS_MD_SHA384, +#endif +#if defined(MBEDTLS_SHA256_C) + MBEDTLS_MD_SHA256, + MBEDTLS_MD_SHA224, +#endif +#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE) + MBEDTLS_MD_SHA1, +#endif + MBEDTLS_MD_NONE +}; +#endif + +static int ssl_preset_suiteb_ciphersuites[] = { + MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, + MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, + 0 +}; + +#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) +static int ssl_preset_suiteb_hashes[] = { + MBEDTLS_MD_SHA256, + MBEDTLS_MD_SHA384, + MBEDTLS_MD_NONE +}; +#endif + +#if defined(MBEDTLS_ECP_C) +static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = { + MBEDTLS_ECP_DP_SECP256R1, + MBEDTLS_ECP_DP_SECP384R1, + MBEDTLS_ECP_DP_NONE +}; +#endif + +/* + * Load default in mbedtls_ssl_config + */ +int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf, + int endpoint, int transport, int preset ) +{ +#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) + int ret; +#endif + + /* Use the functions here so that they are covered in tests, + * but otherwise access member directly for efficiency */ + mbedtls_ssl_conf_endpoint( conf, endpoint ); + mbedtls_ssl_conf_transport( conf, transport ); + + /* + * Things that are common to all presets + */ +#if defined(MBEDTLS_SSL_CLI_C) + if( endpoint == MBEDTLS_SSL_IS_CLIENT ) + { + conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED; +#if defined(MBEDTLS_SSL_SESSION_TICKETS) + conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED; +#endif + } +#endif + +#if defined(MBEDTLS_ARC4_C) + conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED; +#endif + +#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC) + conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED; +#endif + +#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) + conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED; +#endif + +#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING) + conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED; +#endif + +#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C) + conf->f_cookie_write = ssl_cookie_write_dummy; + conf->f_cookie_check = ssl_cookie_check_dummy; +#endif + +#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY) + conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED; +#endif + +#if defined(MBEDTLS_SSL_SRV_C) + conf->cert_req_ca_list = MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED; +#endif + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN; + conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX; +#endif + +#if defined(MBEDTLS_SSL_RENEGOTIATION) + conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT; + memset( conf->renego_period, 0x00, 2 ); + memset( conf->renego_period + 2, 0xFF, 6 ); +#endif + +#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C) + if( endpoint == MBEDTLS_SSL_IS_SERVER ) + { + const unsigned char dhm_p[] = + MBEDTLS_DHM_RFC3526_MODP_2048_P_BIN; + const unsigned char dhm_g[] = + MBEDTLS_DHM_RFC3526_MODP_2048_G_BIN; + + if ( ( ret = mbedtls_ssl_conf_dh_param_bin( conf, + dhm_p, sizeof( dhm_p ), + dhm_g, sizeof( dhm_g ) ) ) != 0 ) + { + return( ret ); + } + } +#endif + + /* + * Preset-specific defaults + */ + switch( preset ) + { + /* + * NSA Suite B + */ + case MBEDTLS_SSL_PRESET_SUITEB: + conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; + conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */ + conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; + conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; + + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = + ssl_preset_suiteb_ciphersuites; + +#if defined(MBEDTLS_X509_CRT_PARSE_C) + conf->cert_profile = &mbedtls_x509_crt_profile_suiteb; +#endif + +#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) + conf->sig_hashes = ssl_preset_suiteb_hashes; +#endif + +#if defined(MBEDTLS_ECP_C) + conf->curve_list = ssl_preset_suiteb_curves; +#endif + break; + + /* + * Default + */ + default: + conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3; + conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_1; /* TLS 1.0 */ + conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION; + conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION; + +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2; +#endif + + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = + conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = + mbedtls_ssl_list_ciphersuites(); + +#if defined(MBEDTLS_X509_CRT_PARSE_C) + conf->cert_profile = &mbedtls_x509_crt_profile_default; +#endif + +#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) + conf->sig_hashes = ssl_preset_default_hashes; +#endif + +#if defined(MBEDTLS_ECP_C) + conf->curve_list = mbedtls_ecp_grp_id_list(); +#endif + +#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C) + conf->dhm_min_bitlen = 1024; +#endif + } + + return( 0 ); +} + +/* + * Free mbedtls_ssl_config + */ +void mbedtls_ssl_config_free( mbedtls_ssl_config *conf ) +{ +#if defined(MBEDTLS_DHM_C) + mbedtls_mpi_free( &conf->dhm_P ); + mbedtls_mpi_free( &conf->dhm_G ); +#endif + +#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED) + if( conf->psk != NULL ) + { + mbedtls_zeroize( conf->psk, conf->psk_len ); + mbedtls_zeroize( conf->psk_identity, conf->psk_identity_len ); + mbedtls_free( conf->psk ); + mbedtls_free( conf->psk_identity ); + conf->psk_len = 0; + conf->psk_identity_len = 0; + } +#endif + +#if defined(MBEDTLS_X509_CRT_PARSE_C) + ssl_key_cert_free( conf->key_cert ); +#endif + + mbedtls_zeroize( conf, sizeof( mbedtls_ssl_config ) ); +} + +#if defined(MBEDTLS_PK_C) && \ + ( defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) ) +/* + * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX + */ +unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk ) +{ +#if defined(MBEDTLS_RSA_C) + if( mbedtls_pk_can_do( pk, MBEDTLS_PK_RSA ) ) + return( MBEDTLS_SSL_SIG_RSA ); +#endif +#if defined(MBEDTLS_ECDSA_C) + if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECDSA ) ) + return( MBEDTLS_SSL_SIG_ECDSA ); +#endif + return( MBEDTLS_SSL_SIG_ANON ); +} + +unsigned char mbedtls_ssl_sig_from_pk_alg( mbedtls_pk_type_t type ) +{ + switch( type ) { + case MBEDTLS_PK_RSA: + return( MBEDTLS_SSL_SIG_RSA ); + case MBEDTLS_PK_ECDSA: + case MBEDTLS_PK_ECKEY: + return( MBEDTLS_SSL_SIG_ECDSA ); + default: + return( MBEDTLS_SSL_SIG_ANON ); + } +} + +mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig ) +{ + switch( sig ) + { +#if defined(MBEDTLS_RSA_C) + case MBEDTLS_SSL_SIG_RSA: + return( MBEDTLS_PK_RSA ); +#endif +#if defined(MBEDTLS_ECDSA_C) + case MBEDTLS_SSL_SIG_ECDSA: + return( MBEDTLS_PK_ECDSA ); +#endif + default: + return( MBEDTLS_PK_NONE ); + } +} +#endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \ + defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) + +/* Find an entry in a signature-hash set matching a given hash algorithm. */ +mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find( mbedtls_ssl_sig_hash_set_t *set, + mbedtls_pk_type_t sig_alg ) +{ + switch( sig_alg ) + { + case MBEDTLS_PK_RSA: + return( set->rsa ); + case MBEDTLS_PK_ECDSA: + return( set->ecdsa ); + default: + return( MBEDTLS_MD_NONE ); + } +} + +/* Add a signature-hash-pair to a signature-hash set */ +void mbedtls_ssl_sig_hash_set_add( mbedtls_ssl_sig_hash_set_t *set, + mbedtls_pk_type_t sig_alg, + mbedtls_md_type_t md_alg ) +{ + switch( sig_alg ) + { + case MBEDTLS_PK_RSA: + if( set->rsa == MBEDTLS_MD_NONE ) + set->rsa = md_alg; + break; + + case MBEDTLS_PK_ECDSA: + if( set->ecdsa == MBEDTLS_MD_NONE ) + set->ecdsa = md_alg; + break; + + default: + break; + } +} + +/* Allow exactly one hash algorithm for each signature. */ +void mbedtls_ssl_sig_hash_set_const_hash( mbedtls_ssl_sig_hash_set_t *set, + mbedtls_md_type_t md_alg ) +{ + set->rsa = md_alg; + set->ecdsa = md_alg; +} + +#endif /* MBEDTLS_SSL_PROTO_TLS1_2) && + MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ + +/* + * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX + */ +mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash ) +{ + switch( hash ) + { +#if defined(MBEDTLS_MD5_C) + case MBEDTLS_SSL_HASH_MD5: + return( MBEDTLS_MD_MD5 ); +#endif +#if defined(MBEDTLS_SHA1_C) + case MBEDTLS_SSL_HASH_SHA1: + return( MBEDTLS_MD_SHA1 ); +#endif +#if defined(MBEDTLS_SHA256_C) + case MBEDTLS_SSL_HASH_SHA224: + return( MBEDTLS_MD_SHA224 ); + case MBEDTLS_SSL_HASH_SHA256: + return( MBEDTLS_MD_SHA256 ); +#endif +#if defined(MBEDTLS_SHA512_C) + case MBEDTLS_SSL_HASH_SHA384: + return( MBEDTLS_MD_SHA384 ); + case MBEDTLS_SSL_HASH_SHA512: + return( MBEDTLS_MD_SHA512 ); +#endif + default: + return( MBEDTLS_MD_NONE ); + } +} + +/* + * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX + */ +unsigned char mbedtls_ssl_hash_from_md_alg( int md ) +{ + switch( md ) + { +#if defined(MBEDTLS_MD5_C) + case MBEDTLS_MD_MD5: + return( MBEDTLS_SSL_HASH_MD5 ); +#endif +#if defined(MBEDTLS_SHA1_C) + case MBEDTLS_MD_SHA1: + return( MBEDTLS_SSL_HASH_SHA1 ); +#endif +#if defined(MBEDTLS_SHA256_C) + case MBEDTLS_MD_SHA224: + return( MBEDTLS_SSL_HASH_SHA224 ); + case MBEDTLS_MD_SHA256: + return( MBEDTLS_SSL_HASH_SHA256 ); +#endif +#if defined(MBEDTLS_SHA512_C) + case MBEDTLS_MD_SHA384: + return( MBEDTLS_SSL_HASH_SHA384 ); + case MBEDTLS_MD_SHA512: + return( MBEDTLS_SSL_HASH_SHA512 ); +#endif + default: + return( MBEDTLS_SSL_HASH_NONE ); + } +} + +#if defined(MBEDTLS_ECP_C) +/* + * Check if a curve proposed by the peer is in our list. + * Return 0 if we're willing to use it, -1 otherwise. + */ +int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id ) +{ + const mbedtls_ecp_group_id *gid; + + if( ssl->conf->curve_list == NULL ) + return( -1 ); + + for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ ) + if( *gid == grp_id ) + return( 0 ); + + return( -1 ); +} +#endif /* MBEDTLS_ECP_C */ + +#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED) +/* + * Check if a hash proposed by the peer is in our list. + * Return 0 if we're willing to use it, -1 otherwise. + */ +int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl, + mbedtls_md_type_t md ) +{ + const int *cur; + + if( ssl->conf->sig_hashes == NULL ) + return( -1 ); + + for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ ) + if( *cur == (int) md ) + return( 0 ); + + return( -1 ); +} +#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */ + +#if defined(MBEDTLS_X509_CRT_PARSE_C) +int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert, + const mbedtls_ssl_ciphersuite_t *ciphersuite, + int cert_endpoint, + uint32_t *flags ) +{ + int ret = 0; +#if defined(MBEDTLS_X509_CHECK_KEY_USAGE) + int usage = 0; +#endif +#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) + const char *ext_oid; + size_t ext_len; +#endif + +#if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \ + !defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) + ((void) cert); + ((void) cert_endpoint); + ((void) flags); +#endif + +#if defined(MBEDTLS_X509_CHECK_KEY_USAGE) + if( cert_endpoint == MBEDTLS_SSL_IS_SERVER ) + { + /* Server part of the key exchange */ + switch( ciphersuite->key_exchange ) + { + case MBEDTLS_KEY_EXCHANGE_RSA: + case MBEDTLS_KEY_EXCHANGE_RSA_PSK: + usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT; + break; + + case MBEDTLS_KEY_EXCHANGE_DHE_RSA: + case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA: + case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA: + usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; + break; + + case MBEDTLS_KEY_EXCHANGE_ECDH_RSA: + case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA: + usage = MBEDTLS_X509_KU_KEY_AGREEMENT; + break; + + /* Don't use default: we want warnings when adding new values */ + case MBEDTLS_KEY_EXCHANGE_NONE: + case MBEDTLS_KEY_EXCHANGE_PSK: + case MBEDTLS_KEY_EXCHANGE_DHE_PSK: + case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK: + case MBEDTLS_KEY_EXCHANGE_ECJPAKE: + usage = 0; + } + } + else + { + /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */ + usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE; + } + + if( mbedtls_x509_crt_check_key_usage( cert, usage ) != 0 ) + { + *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE; + ret = -1; + } +#else + ((void) ciphersuite); +#endif /* MBEDTLS_X509_CHECK_KEY_USAGE */ + +#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) + if( cert_endpoint == MBEDTLS_SSL_IS_SERVER ) + { + ext_oid = MBEDTLS_OID_SERVER_AUTH; + ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH ); + } + else + { + ext_oid = MBEDTLS_OID_CLIENT_AUTH; + ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_CLIENT_AUTH ); + } + + if( mbedtls_x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 ) + { + *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE; + ret = -1; + } +#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */ + + return( ret ); +} +#endif /* MBEDTLS_X509_CRT_PARSE_C */ + +/* + * Convert version numbers to/from wire format + * and, for DTLS, to/from TLS equivalent. + * + * For TLS this is the identity. + * For DTLS, use 1's complement (v -> 255 - v, and then map as follows: + * 1.0 <-> 3.2 (DTLS 1.0 is based on TLS 1.1) + * 1.x <-> 3.x+1 for x != 0 (DTLS 1.2 based on TLS 1.2) + */ +void mbedtls_ssl_write_version( int major, int minor, int transport, + unsigned char ver[2] ) +{ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + if( minor == MBEDTLS_SSL_MINOR_VERSION_2 ) + --minor; /* DTLS 1.0 stored as TLS 1.1 internally */ + + ver[0] = (unsigned char)( 255 - ( major - 2 ) ); + ver[1] = (unsigned char)( 255 - ( minor - 1 ) ); + } + else +#else + ((void) transport); +#endif + { + ver[0] = (unsigned char) major; + ver[1] = (unsigned char) minor; + } +} + +void mbedtls_ssl_read_version( int *major, int *minor, int transport, + const unsigned char ver[2] ) +{ +#if defined(MBEDTLS_SSL_PROTO_DTLS) + if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM ) + { + *major = 255 - ver[0] + 2; + *minor = 255 - ver[1] + 1; + + if( *minor == MBEDTLS_SSL_MINOR_VERSION_1 ) + ++*minor; /* DTLS 1.0 stored as TLS 1.1 internally */ + } + else +#else + ((void) transport); +#endif + { + *major = ver[0]; + *minor = ver[1]; + } +} + +int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md ) +{ +#if defined(MBEDTLS_SSL_PROTO_TLS1_2) + if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 ) + return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; + + switch( md ) + { +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) +#if defined(MBEDTLS_MD5_C) + case MBEDTLS_SSL_HASH_MD5: + return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; +#endif +#if defined(MBEDTLS_SHA1_C) + case MBEDTLS_SSL_HASH_SHA1: + ssl->handshake->calc_verify = ssl_calc_verify_tls; + break; +#endif +#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */ +#if defined(MBEDTLS_SHA512_C) + case MBEDTLS_SSL_HASH_SHA384: + ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384; + break; +#endif +#if defined(MBEDTLS_SHA256_C) + case MBEDTLS_SSL_HASH_SHA256: + ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256; + break; +#endif + default: + return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; + } + + return 0; +#else /* !MBEDTLS_SSL_PROTO_TLS1_2 */ + (void) ssl; + (void) md; + + return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH; +#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ +} + +#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_1) +int mbedtls_ssl_get_key_exchange_md_ssl_tls( mbedtls_ssl_context *ssl, + unsigned char *output, + unsigned char *data, size_t data_len ) +{ + int ret = 0; + mbedtls_md5_context mbedtls_md5; + mbedtls_sha1_context mbedtls_sha1; + + mbedtls_md5_init( &mbedtls_md5 ); + mbedtls_sha1_init( &mbedtls_sha1 ); + + /* + * digitally-signed struct { + * opaque md5_hash[16]; + * opaque sha_hash[20]; + * }; + * + * md5_hash + * MD5(ClientHello.random + ServerHello.random + * + ServerParams); + * sha_hash + * SHA(ClientHello.random + ServerHello.random + * + ServerParams); + */ + if( ( ret = mbedtls_md5_starts_ret( &mbedtls_md5 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_starts_ret", ret ); + goto exit; + } + if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5, + ssl->handshake->randbytes, 64 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret ); + goto exit; + } + if( ( ret = mbedtls_md5_update_ret( &mbedtls_md5, data, data_len ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_update_ret", ret ); + goto exit; + } + if( ( ret = mbedtls_md5_finish_ret( &mbedtls_md5, output ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md5_finish_ret", ret ); + goto exit; + } + + if( ( ret = mbedtls_sha1_starts_ret( &mbedtls_sha1 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_starts_ret", ret ); + goto exit; + } + if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1, + ssl->handshake->randbytes, 64 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret ); + goto exit; + } + if( ( ret = mbedtls_sha1_update_ret( &mbedtls_sha1, data, + data_len ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_update_ret", ret ); + goto exit; + } + if( ( ret = mbedtls_sha1_finish_ret( &mbedtls_sha1, + output + 16 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_sha1_finish_ret", ret ); + goto exit; + } + +exit: + mbedtls_md5_free( &mbedtls_md5 ); + mbedtls_sha1_free( &mbedtls_sha1 ); + + if( ret != 0 ) + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); + + return( ret ); + +} +#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \ + MBEDTLS_SSL_PROTO_TLS1_1 */ + +#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \ + defined(MBEDTLS_SSL_PROTO_TLS1_2) +int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl, + unsigned char *output, + unsigned char *data, size_t data_len, + mbedtls_md_type_t md_alg ) +{ + int ret = 0; + mbedtls_md_context_t ctx; + const mbedtls_md_info_t *md_info = mbedtls_md_info_from_type( md_alg ); + + mbedtls_md_init( &ctx ); + + /* + * digitally-signed struct { + * opaque client_random[32]; + * opaque server_random[32]; + * ServerDHParams params; + * }; + */ + if( ( ret = mbedtls_md_setup( &ctx, md_info, 0 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret ); + goto exit; + } + if( ( ret = mbedtls_md_starts( &ctx ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_starts", ret ); + goto exit; + } + if( ( ret = mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret ); + goto exit; + } + if( ( ret = mbedtls_md_update( &ctx, data, data_len ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_update", ret ); + goto exit; + } + if( ( ret = mbedtls_md_finish( &ctx, output ) ) != 0 ) + { + MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_finish", ret ); + goto exit; + } + +exit: + mbedtls_md_free( &ctx ); + + if( ret != 0 ) + mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL, + MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR ); + + return( ret ); +} +#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \ + MBEDTLS_SSL_PROTO_TLS1_2 */ + +#endif /* MBEDTLS_SSL_TLS_C */ |