diff options
Diffstat (limited to 'thirdparty/openssl/ssl/s3_enc.c')
| -rw-r--r-- | thirdparty/openssl/ssl/s3_enc.c | 970 |
1 files changed, 970 insertions, 0 deletions
diff --git a/thirdparty/openssl/ssl/s3_enc.c b/thirdparty/openssl/ssl/s3_enc.c new file mode 100644 index 0000000000..47a0ec9fe0 --- /dev/null +++ b/thirdparty/openssl/ssl/s3_enc.c @@ -0,0 +1,970 @@ +/* ssl/s3_enc.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ +/* ==================================================================== + * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@openssl.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.openssl.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). + * + */ +/* ==================================================================== + * Copyright 2005 Nokia. All rights reserved. + * + * The portions of the attached software ("Contribution") is developed by + * Nokia Corporation and is licensed pursuant to the OpenSSL open source + * license. + * + * The Contribution, originally written by Mika Kousa and Pasi Eronen of + * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites + * support (see RFC 4279) to OpenSSL. + * + * No patent licenses or other rights except those expressly stated in + * the OpenSSL open source license shall be deemed granted or received + * expressly, by implication, estoppel, or otherwise. + * + * No assurances are provided by Nokia that the Contribution does not + * infringe the patent or other intellectual property rights of any third + * party or that the license provides you with all the necessary rights + * to make use of the Contribution. + * + * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN + * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA + * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY + * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR + * OTHERWISE. + */ + +#include <stdio.h> +#include "ssl_locl.h" +#include <openssl/evp.h> +#include <openssl/md5.h> + +static unsigned char ssl3_pad_1[48] = { + 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, + 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, + 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, + 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, + 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, + 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36 +}; + +static unsigned char ssl3_pad_2[48] = { + 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, + 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, + 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, + 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, + 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, + 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c +}; + +static int ssl3_handshake_mac(SSL *s, int md_nid, + const char *sender, int len, unsigned char *p); +static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num) +{ + EVP_MD_CTX m5; + EVP_MD_CTX s1; + unsigned char buf[16], smd[SHA_DIGEST_LENGTH]; + unsigned char c = 'A'; + unsigned int i, j, k; + +#ifdef CHARSET_EBCDIC + c = os_toascii[c]; /* 'A' in ASCII */ +#endif + k = 0; + EVP_MD_CTX_init(&m5); + EVP_MD_CTX_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); + EVP_MD_CTX_init(&s1); + for (i = 0; (int)i < num; i += MD5_DIGEST_LENGTH) { + k++; + if (k > sizeof buf) { + /* bug: 'buf' is too small for this ciphersuite */ + SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR); + return 0; + } + + for (j = 0; j < k; j++) + buf[j] = c; + c++; + EVP_DigestInit_ex(&s1, EVP_sha1(), NULL); + EVP_DigestUpdate(&s1, buf, k); + EVP_DigestUpdate(&s1, s->session->master_key, + s->session->master_key_length); + EVP_DigestUpdate(&s1, s->s3->server_random, SSL3_RANDOM_SIZE); + EVP_DigestUpdate(&s1, s->s3->client_random, SSL3_RANDOM_SIZE); + EVP_DigestFinal_ex(&s1, smd, NULL); + + EVP_DigestInit_ex(&m5, EVP_md5(), NULL); + EVP_DigestUpdate(&m5, s->session->master_key, + s->session->master_key_length); + EVP_DigestUpdate(&m5, smd, SHA_DIGEST_LENGTH); + if ((int)(i + MD5_DIGEST_LENGTH) > num) { + EVP_DigestFinal_ex(&m5, smd, NULL); + memcpy(km, smd, (num - i)); + } else + EVP_DigestFinal_ex(&m5, km, NULL); + + km += MD5_DIGEST_LENGTH; + } + OPENSSL_cleanse(smd, SHA_DIGEST_LENGTH); + EVP_MD_CTX_cleanup(&m5); + EVP_MD_CTX_cleanup(&s1); + return 1; +} + +int ssl3_change_cipher_state(SSL *s, int which) +{ + unsigned char *p, *mac_secret; + unsigned char exp_key[EVP_MAX_KEY_LENGTH]; + unsigned char exp_iv[EVP_MAX_IV_LENGTH]; + unsigned char *ms, *key, *iv, *er1, *er2; + EVP_CIPHER_CTX *dd; + const EVP_CIPHER *c; +#ifndef OPENSSL_NO_COMP + COMP_METHOD *comp; +#endif + const EVP_MD *m; + EVP_MD_CTX md; + int is_exp, n, i, j, k, cl; + int reuse_dd = 0; + + is_exp = SSL_C_IS_EXPORT(s->s3->tmp.new_cipher); + c = s->s3->tmp.new_sym_enc; + m = s->s3->tmp.new_hash; + /* m == NULL will lead to a crash later */ + OPENSSL_assert(m); +#ifndef OPENSSL_NO_COMP + if (s->s3->tmp.new_compression == NULL) + comp = NULL; + else + comp = s->s3->tmp.new_compression->method; +#endif + + if (which & SSL3_CC_READ) { + if (s->enc_read_ctx != NULL) + reuse_dd = 1; + else if ((s->enc_read_ctx = + OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) + goto err; + else + /* + * make sure it's intialized in case we exit later with an error + */ + EVP_CIPHER_CTX_init(s->enc_read_ctx); + dd = s->enc_read_ctx; + + if (ssl_replace_hash(&s->read_hash, m) == NULL) { + SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); + goto err2; + } +#ifndef OPENSSL_NO_COMP + /* COMPRESS */ + if (s->expand != NULL) { + COMP_CTX_free(s->expand); + s->expand = NULL; + } + if (comp != NULL) { + s->expand = COMP_CTX_new(comp); + if (s->expand == NULL) { + SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, + SSL_R_COMPRESSION_LIBRARY_ERROR); + goto err2; + } + if (s->s3->rrec.comp == NULL) + s->s3->rrec.comp = (unsigned char *) + OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH); + if (s->s3->rrec.comp == NULL) + goto err; + } +#endif + memset(&(s->s3->read_sequence[0]), 0, 8); + mac_secret = &(s->s3->read_mac_secret[0]); + } else { + if (s->enc_write_ctx != NULL) + reuse_dd = 1; + else if ((s->enc_write_ctx = + OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL) + goto err; + else + /* + * make sure it's intialized in case we exit later with an error + */ + EVP_CIPHER_CTX_init(s->enc_write_ctx); + dd = s->enc_write_ctx; + if (ssl_replace_hash(&s->write_hash, m) == NULL) { + SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); + goto err2; + } +#ifndef OPENSSL_NO_COMP + /* COMPRESS */ + if (s->compress != NULL) { + COMP_CTX_free(s->compress); + s->compress = NULL; + } + if (comp != NULL) { + s->compress = COMP_CTX_new(comp); + if (s->compress == NULL) { + SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, + SSL_R_COMPRESSION_LIBRARY_ERROR); + goto err2; + } + } +#endif + memset(&(s->s3->write_sequence[0]), 0, 8); + mac_secret = &(s->s3->write_mac_secret[0]); + } + + if (reuse_dd) + EVP_CIPHER_CTX_cleanup(dd); + + p = s->s3->tmp.key_block; + i = EVP_MD_size(m); + if (i < 0) + goto err2; + cl = EVP_CIPHER_key_length(c); + j = is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ? + cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl; + /* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */ + k = EVP_CIPHER_iv_length(c); + if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) || + (which == SSL3_CHANGE_CIPHER_SERVER_READ)) { + ms = &(p[0]); + n = i + i; + key = &(p[n]); + n += j + j; + iv = &(p[n]); + n += k + k; + er1 = &(s->s3->client_random[0]); + er2 = &(s->s3->server_random[0]); + } else { + n = i; + ms = &(p[n]); + n += i + j; + key = &(p[n]); + n += j + k; + iv = &(p[n]); + n += k; + er1 = &(s->s3->server_random[0]); + er2 = &(s->s3->client_random[0]); + } + + if (n > s->s3->tmp.key_block_length) { + SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR); + goto err2; + } + + EVP_MD_CTX_init(&md); + memcpy(mac_secret, ms, i); + if (is_exp) { + /* + * In here I set both the read and write key/iv to the same value + * since only the correct one will be used :-). + */ + EVP_DigestInit_ex(&md, EVP_md5(), NULL); + EVP_DigestUpdate(&md, key, j); + EVP_DigestUpdate(&md, er1, SSL3_RANDOM_SIZE); + EVP_DigestUpdate(&md, er2, SSL3_RANDOM_SIZE); + EVP_DigestFinal_ex(&md, &(exp_key[0]), NULL); + key = &(exp_key[0]); + + if (k > 0) { + EVP_DigestInit_ex(&md, EVP_md5(), NULL); + EVP_DigestUpdate(&md, er1, SSL3_RANDOM_SIZE); + EVP_DigestUpdate(&md, er2, SSL3_RANDOM_SIZE); + EVP_DigestFinal_ex(&md, &(exp_iv[0]), NULL); + iv = &(exp_iv[0]); + } + } + + s->session->key_arg_length = 0; + + EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE)); + +#ifdef OPENSSL_SSL_TRACE_CRYPTO + if (s->msg_callback) { + + int wh = which & SSL3_CC_WRITE ? + TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ; + s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC, + mac_secret, EVP_MD_size(m), s, s->msg_callback_arg); + if (c->key_len) + s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY, + key, c->key_len, s, s->msg_callback_arg); + if (k) { + s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_IV, + iv, k, s, s->msg_callback_arg); + } + } +#endif + + OPENSSL_cleanse(&(exp_key[0]), sizeof(exp_key)); + OPENSSL_cleanse(&(exp_iv[0]), sizeof(exp_iv)); + EVP_MD_CTX_cleanup(&md); + return (1); + err: + SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE); + err2: + return (0); +} + +int ssl3_setup_key_block(SSL *s) +{ + unsigned char *p; + const EVP_CIPHER *c; + const EVP_MD *hash; + int num; + int ret = 0; + SSL_COMP *comp; + + if (s->s3->tmp.key_block_length != 0) + return (1); + + if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, &comp)) { + SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); + return (0); + } + + s->s3->tmp.new_sym_enc = c; + s->s3->tmp.new_hash = hash; +#ifdef OPENSSL_NO_COMP + s->s3->tmp.new_compression = NULL; +#else + s->s3->tmp.new_compression = comp; +#endif + + num = EVP_MD_size(hash); + if (num < 0) + return 0; + + num = EVP_CIPHER_key_length(c) + num + EVP_CIPHER_iv_length(c); + num *= 2; + + ssl3_cleanup_key_block(s); + + if ((p = OPENSSL_malloc(num)) == NULL) + goto err; + + s->s3->tmp.key_block_length = num; + s->s3->tmp.key_block = p; + + ret = ssl3_generate_key_block(s, p, num); + + if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS)) { + /* + * enable vulnerability countermeasure for CBC ciphers with known-IV + * problem (http://www.openssl.org/~bodo/tls-cbc.txt) + */ + s->s3->need_empty_fragments = 1; + + if (s->session->cipher != NULL) { + if (s->session->cipher->algorithm_enc == SSL_eNULL) + s->s3->need_empty_fragments = 0; + +#ifndef OPENSSL_NO_RC4 + if (s->session->cipher->algorithm_enc == SSL_RC4) + s->s3->need_empty_fragments = 0; +#endif + } + } + + return ret; + + err: + SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, ERR_R_MALLOC_FAILURE); + return (0); +} + +void ssl3_cleanup_key_block(SSL *s) +{ + if (s->s3->tmp.key_block != NULL) { + OPENSSL_cleanse(s->s3->tmp.key_block, s->s3->tmp.key_block_length); + OPENSSL_free(s->s3->tmp.key_block); + s->s3->tmp.key_block = NULL; + } + s->s3->tmp.key_block_length = 0; +} + +/*- + * ssl3_enc encrypts/decrypts the record in |s->wrec| / |s->rrec|, respectively. + * + * Returns: + * 0: (in non-constant time) if the record is publically invalid (i.e. too + * short etc). + * 1: if the record's padding is valid / the encryption was successful. + * -1: if the record's padding is invalid or, if sending, an internal error + * occured. + */ +int ssl3_enc(SSL *s, int send) +{ + SSL3_RECORD *rec; + EVP_CIPHER_CTX *ds; + unsigned long l; + int bs, i, mac_size = 0; + const EVP_CIPHER *enc; + + if (send) { + ds = s->enc_write_ctx; + rec = &(s->s3->wrec); + if (s->enc_write_ctx == NULL) + enc = NULL; + else + enc = EVP_CIPHER_CTX_cipher(s->enc_write_ctx); + } else { + ds = s->enc_read_ctx; + rec = &(s->s3->rrec); + if (s->enc_read_ctx == NULL) + enc = NULL; + else + enc = EVP_CIPHER_CTX_cipher(s->enc_read_ctx); + } + + if ((s->session == NULL) || (ds == NULL) || (enc == NULL)) { + memmove(rec->data, rec->input, rec->length); + rec->input = rec->data; + } else { + l = rec->length; + bs = EVP_CIPHER_block_size(ds->cipher); + + /* COMPRESS */ + + if ((bs != 1) && send) { + i = bs - ((int)l % bs); + + /* we need to add 'i-1' padding bytes */ + l += i; + /* + * the last of these zero bytes will be overwritten with the + * padding length. + */ + memset(&rec->input[rec->length], 0, i); + rec->length += i; + rec->input[l - 1] = (i - 1); + } + + if (!send) { + if (l == 0 || l % bs != 0) + return 0; + /* otherwise, rec->length >= bs */ + } + + if (EVP_Cipher(ds, rec->data, rec->input, l) < 1) + return -1; + + if (EVP_MD_CTX_md(s->read_hash) != NULL) + mac_size = EVP_MD_CTX_size(s->read_hash); + if ((bs != 1) && !send) + return ssl3_cbc_remove_padding(s, rec, bs, mac_size); + } + return (1); +} + +void ssl3_init_finished_mac(SSL *s) +{ + if (s->s3->handshake_buffer) + BIO_free(s->s3->handshake_buffer); + if (s->s3->handshake_dgst) + ssl3_free_digest_list(s); + s->s3->handshake_buffer = BIO_new(BIO_s_mem()); + (void)BIO_set_close(s->s3->handshake_buffer, BIO_CLOSE); +} + +void ssl3_free_digest_list(SSL *s) +{ + int i; + if (!s->s3->handshake_dgst) + return; + for (i = 0; i < SSL_MAX_DIGEST; i++) { + if (s->s3->handshake_dgst[i]) + EVP_MD_CTX_destroy(s->s3->handshake_dgst[i]); + } + OPENSSL_free(s->s3->handshake_dgst); + s->s3->handshake_dgst = NULL; +} + +void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len) +{ + if (s->s3->handshake_buffer + && !(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) { + BIO_write(s->s3->handshake_buffer, (void *)buf, len); + } else { + int i; + for (i = 0; i < SSL_MAX_DIGEST; i++) { + if (s->s3->handshake_dgst[i] != NULL) + EVP_DigestUpdate(s->s3->handshake_dgst[i], buf, len); + } + } +} + +int ssl3_digest_cached_records(SSL *s) +{ + int i; + long mask; + const EVP_MD *md; + long hdatalen; + void *hdata; + + /* Allocate handshake_dgst array */ + ssl3_free_digest_list(s); + s->s3->handshake_dgst = + OPENSSL_malloc(SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *)); + memset(s->s3->handshake_dgst, 0, SSL_MAX_DIGEST * sizeof(EVP_MD_CTX *)); + hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); + if (hdatalen <= 0) { + SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, SSL_R_BAD_HANDSHAKE_LENGTH); + return 0; + } + + /* Loop through bitso of algorithm2 field and create MD_CTX-es */ + for (i = 0; ssl_get_handshake_digest(i, &mask, &md); i++) { + if ((mask & ssl_get_algorithm2(s)) && md) { + s->s3->handshake_dgst[i] = EVP_MD_CTX_create(); +#ifdef OPENSSL_FIPS + if (EVP_MD_nid(md) == NID_md5) { + EVP_MD_CTX_set_flags(s->s3->handshake_dgst[i], + EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); + } +#endif + EVP_DigestInit_ex(s->s3->handshake_dgst[i], md, NULL); + EVP_DigestUpdate(s->s3->handshake_dgst[i], hdata, hdatalen); + } else { + s->s3->handshake_dgst[i] = NULL; + } + } + if (!(s->s3->flags & TLS1_FLAGS_KEEP_HANDSHAKE)) { + /* Free handshake_buffer BIO */ + BIO_free(s->s3->handshake_buffer); + s->s3->handshake_buffer = NULL; + } + + return 1; +} + +int ssl3_cert_verify_mac(SSL *s, int md_nid, unsigned char *p) +{ + return (ssl3_handshake_mac(s, md_nid, NULL, 0, p)); +} + +int ssl3_final_finish_mac(SSL *s, + const char *sender, int len, unsigned char *p) +{ + int ret, sha1len; + ret = ssl3_handshake_mac(s, NID_md5, sender, len, p); + if (ret == 0) + return 0; + + p += ret; + + sha1len = ssl3_handshake_mac(s, NID_sha1, sender, len, p); + if (sha1len == 0) + return 0; + + ret += sha1len; + return (ret); +} + +static int ssl3_handshake_mac(SSL *s, int md_nid, + const char *sender, int len, unsigned char *p) +{ + unsigned int ret; + int npad, n; + unsigned int i; + unsigned char md_buf[EVP_MAX_MD_SIZE]; + EVP_MD_CTX ctx, *d = NULL; + + if (s->s3->handshake_buffer) + if (!ssl3_digest_cached_records(s)) + return 0; + + /* + * Search for digest of specified type in the handshake_dgst array + */ + for (i = 0; i < SSL_MAX_DIGEST; i++) { + if (s->s3->handshake_dgst[i] + && EVP_MD_CTX_type(s->s3->handshake_dgst[i]) == md_nid) { + d = s->s3->handshake_dgst[i]; + break; + } + } + if (!d) { + SSLerr(SSL_F_SSL3_HANDSHAKE_MAC, SSL_R_NO_REQUIRED_DIGEST); + return 0; + } + EVP_MD_CTX_init(&ctx); + EVP_MD_CTX_set_flags(&ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); + EVP_MD_CTX_copy_ex(&ctx, d); + n = EVP_MD_CTX_size(&ctx); + if (n < 0) + return 0; + + npad = (48 / n) * n; + if ((sender != NULL && EVP_DigestUpdate(&ctx, sender, len) <= 0) + || EVP_DigestUpdate(&ctx, s->session->master_key, + s->session->master_key_length) <= 0 + || EVP_DigestUpdate(&ctx, ssl3_pad_1, npad) <= 0 + || EVP_DigestFinal_ex(&ctx, md_buf, &i) <= 0 + + || EVP_DigestInit_ex(&ctx, EVP_MD_CTX_md(&ctx), NULL) <= 0 + || EVP_DigestUpdate(&ctx, s->session->master_key, + s->session->master_key_length) <= 0 + || EVP_DigestUpdate(&ctx, ssl3_pad_2, npad) <= 0 + || EVP_DigestUpdate(&ctx, md_buf, i) <= 0 + || EVP_DigestFinal_ex(&ctx, p, &ret) <= 0) { + SSLerr(SSL_F_SSL3_HANDSHAKE_MAC, ERR_R_INTERNAL_ERROR); + ret = 0; + } + + EVP_MD_CTX_cleanup(&ctx); + + return ((int)ret); +} + +int n_ssl3_mac(SSL *ssl, unsigned char *md, int send) +{ + SSL3_RECORD *rec; + unsigned char *mac_sec, *seq; + EVP_MD_CTX md_ctx; + const EVP_MD_CTX *hash; + unsigned char *p, rec_char; + size_t md_size, orig_len; + int npad; + int t; + + if (send) { + rec = &(ssl->s3->wrec); + mac_sec = &(ssl->s3->write_mac_secret[0]); + seq = &(ssl->s3->write_sequence[0]); + hash = ssl->write_hash; + } else { + rec = &(ssl->s3->rrec); + mac_sec = &(ssl->s3->read_mac_secret[0]); + seq = &(ssl->s3->read_sequence[0]); + hash = ssl->read_hash; + } + + t = EVP_MD_CTX_size(hash); + if (t < 0) + return -1; + md_size = t; + npad = (48 / md_size) * md_size; + + /* + * kludge: ssl3_cbc_remove_padding passes padding length in rec->type + */ + orig_len = rec->length + md_size + ((unsigned int)rec->type >> 8); + rec->type &= 0xff; + + if (!send && + EVP_CIPHER_CTX_mode(ssl->enc_read_ctx) == EVP_CIPH_CBC_MODE && + ssl3_cbc_record_digest_supported(hash)) { + /* + * This is a CBC-encrypted record. We must avoid leaking any + * timing-side channel information about how many blocks of data we + * are hashing because that gives an attacker a timing-oracle. + */ + + /*- + * npad is, at most, 48 bytes and that's with MD5: + * 16 + 48 + 8 (sequence bytes) + 1 + 2 = 75. + * + * With SHA-1 (the largest hash speced for SSLv3) the hash size + * goes up 4, but npad goes down by 8, resulting in a smaller + * total size. + */ + unsigned char header[75]; + unsigned j = 0; + memcpy(header + j, mac_sec, md_size); + j += md_size; + memcpy(header + j, ssl3_pad_1, npad); + j += npad; + memcpy(header + j, seq, 8); + j += 8; + header[j++] = rec->type; + header[j++] = rec->length >> 8; + header[j++] = rec->length & 0xff; + + /* Final param == is SSLv3 */ + if (ssl3_cbc_digest_record(hash, + md, &md_size, + header, rec->input, + rec->length + md_size, orig_len, + mac_sec, md_size, 1) <= 0) + return -1; + } else { + unsigned int md_size_u; + /* Chop the digest off the end :-) */ + EVP_MD_CTX_init(&md_ctx); + + rec_char = rec->type; + p = md; + s2n(rec->length, p); + if (EVP_MD_CTX_copy_ex(&md_ctx, hash) <= 0 + || EVP_DigestUpdate(&md_ctx, mac_sec, md_size) <= 0 + || EVP_DigestUpdate(&md_ctx, ssl3_pad_1, npad) <= 0 + || EVP_DigestUpdate(&md_ctx, seq, 8) <= 0 + || EVP_DigestUpdate(&md_ctx, &rec_char, 1) <= 0 + || EVP_DigestUpdate(&md_ctx, md, 2) <= 0 + || EVP_DigestUpdate(&md_ctx, rec->input, rec->length) <= 0 + || EVP_DigestFinal_ex(&md_ctx, md, NULL) <= 0 + || EVP_MD_CTX_copy_ex(&md_ctx, hash) <= 0 + || EVP_DigestUpdate(&md_ctx, mac_sec, md_size) <= 0 + || EVP_DigestUpdate(&md_ctx, ssl3_pad_2, npad) <= 0 + || EVP_DigestUpdate(&md_ctx, md, md_size) <= 0 + || EVP_DigestFinal_ex(&md_ctx, md, &md_size_u) <= 0) { + EVP_MD_CTX_cleanup(&md_ctx); + return -1; + } + md_size = md_size_u; + + EVP_MD_CTX_cleanup(&md_ctx); + } + + ssl3_record_sequence_update(seq); + return (md_size); +} + +void ssl3_record_sequence_update(unsigned char *seq) +{ + int i; + + for (i = 7; i >= 0; i--) { + ++seq[i]; + if (seq[i] != 0) + break; + } +} + +int ssl3_generate_master_secret(SSL *s, unsigned char *out, unsigned char *p, + int len) +{ + static const unsigned char *salt[3] = { +#ifndef CHARSET_EBCDIC + (const unsigned char *)"A", + (const unsigned char *)"BB", + (const unsigned char *)"CCC", +#else + (const unsigned char *)"\x41", + (const unsigned char *)"\x42\x42", + (const unsigned char *)"\x43\x43\x43", +#endif + }; + unsigned char buf[EVP_MAX_MD_SIZE]; + EVP_MD_CTX ctx; + int i, ret = 0; + unsigned int n; +#ifdef OPENSSL_SSL_TRACE_CRYPTO + unsigned char *tmpout = out; +#endif + + EVP_MD_CTX_init(&ctx); + for (i = 0; i < 3; i++) { + if (EVP_DigestInit_ex(&ctx, s->ctx->sha1, NULL) <= 0 + || EVP_DigestUpdate(&ctx, salt[i], + strlen((const char *)salt[i])) <= 0 + || EVP_DigestUpdate(&ctx, p, len) <= 0 + || EVP_DigestUpdate(&ctx, &(s->s3->client_random[0]), + SSL3_RANDOM_SIZE) <= 0 + || EVP_DigestUpdate(&ctx, &(s->s3->server_random[0]), + SSL3_RANDOM_SIZE) <= 0 + || EVP_DigestFinal_ex(&ctx, buf, &n) <= 0 + + || EVP_DigestInit_ex(&ctx, s->ctx->md5, NULL) <= 0 + || EVP_DigestUpdate(&ctx, p, len) <= 0 + || EVP_DigestUpdate(&ctx, buf, n) <= 0 + || EVP_DigestFinal_ex(&ctx, out, &n) <= 0) { + SSLerr(SSL_F_SSL3_GENERATE_MASTER_SECRET, ERR_R_INTERNAL_ERROR); + ret = 0; + break; + } + out += n; + ret += n; + } + EVP_MD_CTX_cleanup(&ctx); + +#ifdef OPENSSL_SSL_TRACE_CRYPTO + if (ret > 0 && s->msg_callback) { + s->msg_callback(2, s->version, TLS1_RT_CRYPTO_PREMASTER, + p, len, s, s->msg_callback_arg); + s->msg_callback(2, s->version, TLS1_RT_CRYPTO_CLIENT_RANDOM, + s->s3->client_random, SSL3_RANDOM_SIZE, + s, s->msg_callback_arg); + s->msg_callback(2, s->version, TLS1_RT_CRYPTO_SERVER_RANDOM, + s->s3->server_random, SSL3_RANDOM_SIZE, + s, s->msg_callback_arg); + s->msg_callback(2, s->version, TLS1_RT_CRYPTO_MASTER, + tmpout, SSL3_MASTER_SECRET_SIZE, + s, s->msg_callback_arg); + } +#endif + OPENSSL_cleanse(buf, sizeof buf); + return (ret); +} + +int ssl3_alert_code(int code) +{ + switch (code) { + case SSL_AD_CLOSE_NOTIFY: + return (SSL3_AD_CLOSE_NOTIFY); + case SSL_AD_UNEXPECTED_MESSAGE: + return (SSL3_AD_UNEXPECTED_MESSAGE); + case SSL_AD_BAD_RECORD_MAC: + return (SSL3_AD_BAD_RECORD_MAC); + case SSL_AD_DECRYPTION_FAILED: + return (SSL3_AD_BAD_RECORD_MAC); + case SSL_AD_RECORD_OVERFLOW: + return (SSL3_AD_BAD_RECORD_MAC); + case SSL_AD_DECOMPRESSION_FAILURE: + return (SSL3_AD_DECOMPRESSION_FAILURE); + case SSL_AD_HANDSHAKE_FAILURE: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_NO_CERTIFICATE: + return (SSL3_AD_NO_CERTIFICATE); + case SSL_AD_BAD_CERTIFICATE: + return (SSL3_AD_BAD_CERTIFICATE); + case SSL_AD_UNSUPPORTED_CERTIFICATE: + return (SSL3_AD_UNSUPPORTED_CERTIFICATE); + case SSL_AD_CERTIFICATE_REVOKED: + return (SSL3_AD_CERTIFICATE_REVOKED); + case SSL_AD_CERTIFICATE_EXPIRED: + return (SSL3_AD_CERTIFICATE_EXPIRED); + case SSL_AD_CERTIFICATE_UNKNOWN: + return (SSL3_AD_CERTIFICATE_UNKNOWN); + case SSL_AD_ILLEGAL_PARAMETER: + return (SSL3_AD_ILLEGAL_PARAMETER); + case SSL_AD_UNKNOWN_CA: + return (SSL3_AD_BAD_CERTIFICATE); + case SSL_AD_ACCESS_DENIED: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_DECODE_ERROR: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_DECRYPT_ERROR: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_EXPORT_RESTRICTION: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_PROTOCOL_VERSION: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_INSUFFICIENT_SECURITY: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_INTERNAL_ERROR: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_USER_CANCELLED: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_NO_RENEGOTIATION: + return (-1); /* Don't send it :-) */ + case SSL_AD_UNSUPPORTED_EXTENSION: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_CERTIFICATE_UNOBTAINABLE: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_UNRECOGNIZED_NAME: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_BAD_CERTIFICATE_HASH_VALUE: + return (SSL3_AD_HANDSHAKE_FAILURE); + case SSL_AD_UNKNOWN_PSK_IDENTITY: + return (TLS1_AD_UNKNOWN_PSK_IDENTITY); + case SSL_AD_INAPPROPRIATE_FALLBACK: + return (TLS1_AD_INAPPROPRIATE_FALLBACK); + default: + return (-1); + } +} |