diff options
Diffstat (limited to 'thirdparty/openssl/ssl/s3_pkt.c')
| -rw-r--r-- | thirdparty/openssl/ssl/s3_pkt.c | 1748 |
1 files changed, 1748 insertions, 0 deletions
diff --git a/thirdparty/openssl/ssl/s3_pkt.c b/thirdparty/openssl/ssl/s3_pkt.c new file mode 100644 index 0000000000..379890237e --- /dev/null +++ b/thirdparty/openssl/ssl/s3_pkt.c @@ -0,0 +1,1748 @@ +/* ssl/s3_pkt.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) 1998-2002 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). + * + */ + +#include <stdio.h> +#include <limits.h> +#include <errno.h> +#define USE_SOCKETS +#include "ssl_locl.h" +#include <openssl/evp.h> +#include <openssl/buffer.h> +#include <openssl/rand.h> + +#ifndef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK +# define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0 +#endif + +#if defined(OPENSSL_SMALL_FOOTPRINT) || \ + !( defined(AES_ASM) && ( \ + defined(__x86_64) || defined(__x86_64__) || \ + defined(_M_AMD64) || defined(_M_X64) || \ + defined(__INTEL__) ) \ + ) +# undef EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK +# define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0 +#endif + +static int do_ssl3_write(SSL *s, int type, const unsigned char *buf, + unsigned int len, int create_empty_fragment); +static int ssl3_get_record(SSL *s); + +int ssl3_read_n(SSL *s, int n, int max, int extend) +{ + /* + * If extend == 0, obtain new n-byte packet; if extend == 1, increase + * packet by another n bytes. The packet will be in the sub-array of + * s->s3->rbuf.buf specified by s->packet and s->packet_length. (If + * s->read_ahead is set, 'max' bytes may be stored in rbuf [plus + * s->packet_length bytes if extend == 1].) + */ + int i, len, left; + long align = 0; + unsigned char *pkt; + SSL3_BUFFER *rb; + + if (n <= 0) + return n; + + rb = &(s->s3->rbuf); + if (rb->buf == NULL) + if (!ssl3_setup_read_buffer(s)) + return -1; + + left = rb->left; +#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 + align = (long)rb->buf + SSL3_RT_HEADER_LENGTH; + align = (-align) & (SSL3_ALIGN_PAYLOAD - 1); +#endif + + if (!extend) { + /* start with empty packet ... */ + if (left == 0) + rb->offset = align; + else if (align != 0 && left >= SSL3_RT_HEADER_LENGTH) { + /* + * check if next packet length is large enough to justify payload + * alignment... + */ + pkt = rb->buf + rb->offset; + if (pkt[0] == SSL3_RT_APPLICATION_DATA + && (pkt[3] << 8 | pkt[4]) >= 128) { + /* + * Note that even if packet is corrupted and its length field + * is insane, we can only be led to wrong decision about + * whether memmove will occur or not. Header values has no + * effect on memmove arguments and therefore no buffer + * overrun can be triggered. + */ + memmove(rb->buf + align, pkt, left); + rb->offset = align; + } + } + s->packet = rb->buf + rb->offset; + s->packet_length = 0; + /* ... now we can act as if 'extend' was set */ + } + + /* + * For DTLS/UDP reads should not span multiple packets because the read + * operation returns the whole packet at once (as long as it fits into + * the buffer). + */ + if (SSL_IS_DTLS(s)) { + if (left == 0 && extend) + return 0; + if (left > 0 && n > left) + n = left; + } + + /* if there is enough in the buffer from a previous read, take some */ + if (left >= n) { + s->packet_length += n; + rb->left = left - n; + rb->offset += n; + return (n); + } + + /* else we need to read more data */ + + len = s->packet_length; + pkt = rb->buf + align; + /* + * Move any available bytes to front of buffer: 'len' bytes already + * pointed to by 'packet', 'left' extra ones at the end + */ + if (s->packet != pkt) { /* len > 0 */ + memmove(pkt, s->packet, len + left); + s->packet = pkt; + rb->offset = len + align; + } + + if (n > (int)(rb->len - rb->offset)) { /* does not happen */ + SSLerr(SSL_F_SSL3_READ_N, ERR_R_INTERNAL_ERROR); + return -1; + } + + /* We always act like read_ahead is set for DTLS */ + if (!s->read_ahead && !SSL_IS_DTLS(s)) + /* ignore max parameter */ + max = n; + else { + if (max < n) + max = n; + if (max > (int)(rb->len - rb->offset)) + max = rb->len - rb->offset; + } + + while (left < n) { + /* + * Now we have len+left bytes at the front of s->s3->rbuf.buf and + * need to read in more until we have len+n (up to len+max if + * possible) + */ + + clear_sys_error(); + if (s->rbio != NULL) { + s->rwstate = SSL_READING; + i = BIO_read(s->rbio, pkt + len + left, max - left); + } else { + SSLerr(SSL_F_SSL3_READ_N, SSL_R_READ_BIO_NOT_SET); + i = -1; + } + + if (i <= 0) { + rb->left = left; + if (s->mode & SSL_MODE_RELEASE_BUFFERS && !SSL_IS_DTLS(s)) + if (len + left == 0) + ssl3_release_read_buffer(s); + return (i); + } + left += i; + /* + * reads should *never* span multiple packets for DTLS because the + * underlying transport protocol is message oriented as opposed to + * byte oriented as in the TLS case. + */ + if (SSL_IS_DTLS(s)) { + if (n > left) + n = left; /* makes the while condition false */ + } + } + + /* done reading, now the book-keeping */ + rb->offset += n; + rb->left = left - n; + s->packet_length += n; + s->rwstate = SSL_NOTHING; + return (n); +} + +/* + * MAX_EMPTY_RECORDS defines the number of consecutive, empty records that + * will be processed per call to ssl3_get_record. Without this limit an + * attacker could send empty records at a faster rate than we can process and + * cause ssl3_get_record to loop forever. + */ +#define MAX_EMPTY_RECORDS 32 + +/*- + * Call this to get a new input record. + * It will return <= 0 if more data is needed, normally due to an error + * or non-blocking IO. + * When it finishes, one packet has been decoded and can be found in + * ssl->s3->rrec.type - is the type of record + * ssl->s3->rrec.data, - data + * ssl->s3->rrec.length, - number of bytes + */ +/* used only by ssl3_read_bytes */ +static int ssl3_get_record(SSL *s) +{ + int ssl_major, ssl_minor, al; + int enc_err, n, i, ret = -1; + SSL3_RECORD *rr; + SSL_SESSION *sess; + unsigned char *p; + unsigned char md[EVP_MAX_MD_SIZE]; + short version; + unsigned mac_size, orig_len; + size_t extra; + unsigned empty_record_count = 0; + + rr = &(s->s3->rrec); + sess = s->session; + + if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER) + extra = SSL3_RT_MAX_EXTRA; + else + extra = 0; + if (extra && !s->s3->init_extra) { + /* + * An application error: SLS_OP_MICROSOFT_BIG_SSLV3_BUFFER set after + * ssl3_setup_buffers() was done + */ + SSLerr(SSL_F_SSL3_GET_RECORD, ERR_R_INTERNAL_ERROR); + return -1; + } + + again: + /* check if we have the header */ + if ((s->rstate != SSL_ST_READ_BODY) || + (s->packet_length < SSL3_RT_HEADER_LENGTH)) { + n = ssl3_read_n(s, SSL3_RT_HEADER_LENGTH, s->s3->rbuf.len, 0); + if (n <= 0) + return (n); /* error or non-blocking */ + s->rstate = SSL_ST_READ_BODY; + + p = s->packet; + if (s->msg_callback) + s->msg_callback(0, 0, SSL3_RT_HEADER, p, 5, s, + s->msg_callback_arg); + + /* Pull apart the header into the SSL3_RECORD */ + rr->type = *(p++); + ssl_major = *(p++); + ssl_minor = *(p++); + version = (ssl_major << 8) | ssl_minor; + n2s(p, rr->length); +#if 0 + fprintf(stderr, "Record type=%d, Length=%d\n", rr->type, rr->length); +#endif + + /* Lets check version */ + if (!s->first_packet) { + if (version != s->version) { + SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER); + if ((s->version & 0xFF00) == (version & 0xFF00) + && !s->enc_write_ctx && !s->write_hash) { + if (rr->type == SSL3_RT_ALERT) { + /* + * The record is using an incorrect version number, but + * what we've got appears to be an alert. We haven't + * read the body yet to check whether its a fatal or + * not - but chances are it is. We probably shouldn't + * send a fatal alert back. We'll just end. + */ + goto err; + } + /* + * Send back error using their minor version number :-) + */ + s->version = (unsigned short)version; + } + al = SSL_AD_PROTOCOL_VERSION; + goto f_err; + } + } + + if ((version >> 8) != SSL3_VERSION_MAJOR) { + SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_WRONG_VERSION_NUMBER); + goto err; + } + + if (rr->length > s->s3->rbuf.len - SSL3_RT_HEADER_LENGTH) { + al = SSL_AD_RECORD_OVERFLOW; + SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_PACKET_LENGTH_TOO_LONG); + goto f_err; + } + + /* now s->rstate == SSL_ST_READ_BODY */ + } + + /* s->rstate == SSL_ST_READ_BODY, get and decode the data */ + + if (rr->length > s->packet_length - SSL3_RT_HEADER_LENGTH) { + /* now s->packet_length == SSL3_RT_HEADER_LENGTH */ + i = rr->length; + n = ssl3_read_n(s, i, i, 1); + if (n <= 0) + return (n); /* error or non-blocking io */ + /* + * now n == rr->length, and s->packet_length == SSL3_RT_HEADER_LENGTH + * + rr->length + */ + } + + s->rstate = SSL_ST_READ_HEADER; /* set state for later operations */ + + /* + * At this point, s->packet_length == SSL3_RT_HEADER_LNGTH + rr->length, + * and we have that many bytes in s->packet + */ + rr->input = &(s->packet[SSL3_RT_HEADER_LENGTH]); + + /* + * ok, we can now read from 's->packet' data into 'rr' rr->input points + * at rr->length bytes, which need to be copied into rr->data by either + * the decryption or by the decompression When the data is 'copied' into + * the rr->data buffer, rr->input will be pointed at the new buffer + */ + + /* + * We now have - encrypted [ MAC [ compressed [ plain ] ] ] rr->length + * bytes of encrypted compressed stuff. + */ + + /* check is not needed I believe */ + if (rr->length > SSL3_RT_MAX_ENCRYPTED_LENGTH + extra) { + al = SSL_AD_RECORD_OVERFLOW; + SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_ENCRYPTED_LENGTH_TOO_LONG); + goto f_err; + } + + /* decrypt in place in 'rr->input' */ + rr->data = rr->input; + + enc_err = s->method->ssl3_enc->enc(s, 0); + /*- + * enc_err is: + * 0: (in non-constant time) if the record is publically invalid. + * 1: if the padding is valid + * -1: if the padding is invalid + */ + if (enc_err == 0) { + al = SSL_AD_DECRYPTION_FAILED; + SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BLOCK_CIPHER_PAD_IS_WRONG); + goto f_err; + } +#ifdef TLS_DEBUG + printf("dec %d\n", rr->length); + { + unsigned int z; + for (z = 0; z < rr->length; z++) + printf("%02X%c", rr->data[z], ((z + 1) % 16) ? ' ' : '\n'); + } + printf("\n"); +#endif + + /* r->length is now the compressed data plus mac */ + if ((sess != NULL) && + (s->enc_read_ctx != NULL) && (EVP_MD_CTX_md(s->read_hash) != NULL)) { + /* s->read_hash != NULL => mac_size != -1 */ + unsigned char *mac = NULL; + unsigned char mac_tmp[EVP_MAX_MD_SIZE]; + mac_size = EVP_MD_CTX_size(s->read_hash); + OPENSSL_assert(mac_size <= EVP_MAX_MD_SIZE); + + /* + * kludge: *_cbc_remove_padding passes padding length in rr->type + */ + orig_len = rr->length + ((unsigned int)rr->type >> 8); + + /* + * orig_len is the length of the record before any padding was + * removed. This is public information, as is the MAC in use, + * therefore we can safely process the record in a different amount + * of time if it's too short to possibly contain a MAC. + */ + if (orig_len < mac_size || + /* CBC records must have a padding length byte too. */ + (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE && + orig_len < mac_size + 1)) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } + + if (EVP_CIPHER_CTX_mode(s->enc_read_ctx) == EVP_CIPH_CBC_MODE) { + /* + * We update the length so that the TLS header bytes can be + * constructed correctly but we need to extract the MAC in + * constant time from within the record, without leaking the + * contents of the padding bytes. + */ + mac = mac_tmp; + ssl3_cbc_copy_mac(mac_tmp, rr, mac_size, orig_len); + rr->length -= mac_size; + } else { + /* + * In this case there's no padding, so |orig_len| equals + * |rec->length| and we checked that there's enough bytes for + * |mac_size| above. + */ + rr->length -= mac_size; + mac = &rr->data[rr->length]; + } + + i = s->method->ssl3_enc->mac(s, md, 0 /* not send */ ); + if (i < 0 || mac == NULL + || CRYPTO_memcmp(md, mac, (size_t)mac_size) != 0) + enc_err = -1; + if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + extra + mac_size) + enc_err = -1; + } + + if (enc_err < 0) { + /* + * A separate 'decryption_failed' alert was introduced with TLS 1.0, + * SSL 3.0 only has 'bad_record_mac'. But unless a decryption + * failure is directly visible from the ciphertext anyway, we should + * not reveal which kind of error occured -- this might become + * visible to an attacker (e.g. via a logfile) + */ + al = SSL_AD_BAD_RECORD_MAC; + SSLerr(SSL_F_SSL3_GET_RECORD, + SSL_R_DECRYPTION_FAILED_OR_BAD_RECORD_MAC); + goto f_err; + } + + /* r->length is now just compressed */ + if (s->expand != NULL) { + if (rr->length > SSL3_RT_MAX_COMPRESSED_LENGTH + extra) { + al = SSL_AD_RECORD_OVERFLOW; + SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_COMPRESSED_LENGTH_TOO_LONG); + goto f_err; + } + if (!ssl3_do_uncompress(s)) { + al = SSL_AD_DECOMPRESSION_FAILURE; + SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_BAD_DECOMPRESSION); + goto f_err; + } + } + + if (rr->length > SSL3_RT_MAX_PLAIN_LENGTH + extra) { + al = SSL_AD_RECORD_OVERFLOW; + SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_DATA_LENGTH_TOO_LONG); + goto f_err; + } + + rr->off = 0; + /*- + * So at this point the following is true + * ssl->s3->rrec.type is the type of record + * ssl->s3->rrec.length == number of bytes in record + * ssl->s3->rrec.off == offset to first valid byte + * ssl->s3->rrec.data == where to take bytes from, increment + * after use :-). + */ + + /* we have pulled in a full packet so zero things */ + s->packet_length = 0; + + /* just read a 0 length packet */ + if (rr->length == 0) { + empty_record_count++; + if (empty_record_count > MAX_EMPTY_RECORDS) { + al = SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_GET_RECORD, SSL_R_RECORD_TOO_SMALL); + goto f_err; + } + goto again; + } +#if 0 + fprintf(stderr, "Ultimate Record type=%d, Length=%d\n", rr->type, + rr->length); +#endif + + return (1); + + f_err: + ssl3_send_alert(s, SSL3_AL_FATAL, al); + err: + return (ret); +} + +int ssl3_do_uncompress(SSL *ssl) +{ +#ifndef OPENSSL_NO_COMP + int i; + SSL3_RECORD *rr; + + rr = &(ssl->s3->rrec); + i = COMP_expand_block(ssl->expand, rr->comp, + SSL3_RT_MAX_PLAIN_LENGTH, rr->data, + (int)rr->length); + if (i < 0) + return (0); + else + rr->length = i; + rr->data = rr->comp; +#endif + return (1); +} + +int ssl3_do_compress(SSL *ssl) +{ +#ifndef OPENSSL_NO_COMP + int i; + SSL3_RECORD *wr; + + wr = &(ssl->s3->wrec); + i = COMP_compress_block(ssl->compress, wr->data, + SSL3_RT_MAX_COMPRESSED_LENGTH, + wr->input, (int)wr->length); + if (i < 0) + return (0); + else + wr->length = i; + + wr->input = wr->data; +#endif + return (1); +} + +/* + * Call this to write data in records of type 'type' It will return <= 0 if + * not all data has been sent or non-blocking IO. + */ +int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len) +{ + const unsigned char *buf = buf_; + int tot; + unsigned int n, nw; +#if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK + unsigned int max_send_fragment; +#endif + SSL3_BUFFER *wb = &(s->s3->wbuf); + int i; + + s->rwstate = SSL_NOTHING; + OPENSSL_assert(s->s3->wnum <= INT_MAX); + tot = s->s3->wnum; + s->s3->wnum = 0; + + if (SSL_in_init(s) && !s->in_handshake) { + i = s->handshake_func(s); + if (i < 0) + return (i); + if (i == 0) { + SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); + return -1; + } + } + + /* + * ensure that if we end up with a smaller value of data to write out + * than the the original len from a write which didn't complete for + * non-blocking I/O and also somehow ended up avoiding the check for + * this in ssl3_write_pending/SSL_R_BAD_WRITE_RETRY as it must never be + * possible to end up with (len-tot) as a large number that will then + * promptly send beyond the end of the users buffer ... so we trap and + * report the error in a way the user will notice + */ + if (len < tot) { + SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_BAD_LENGTH); + return (-1); + } + + /* + * first check if there is a SSL3_BUFFER still being written out. This + * will happen with non blocking IO + */ + if (wb->left != 0) { + i = ssl3_write_pending(s, type, &buf[tot], s->s3->wpend_tot); + if (i <= 0) { + /* XXX should we ssl3_release_write_buffer if i<0? */ + s->s3->wnum = tot; + return i; + } + tot += i; /* this might be last fragment */ + } +#if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK + /* + * Depending on platform multi-block can deliver several *times* + * better performance. Downside is that it has to allocate + * jumbo buffer to accomodate up to 8 records, but the + * compromise is considered worthy. + */ + if (type == SSL3_RT_APPLICATION_DATA && + len >= 4 * (int)(max_send_fragment = s->max_send_fragment) && + s->compress == NULL && s->msg_callback == NULL && + SSL_USE_EXPLICIT_IV(s) && + EVP_CIPHER_flags(s->enc_write_ctx->cipher) & + EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK) { + unsigned char aad[13]; + EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param; + int packlen; + + /* minimize address aliasing conflicts */ + if ((max_send_fragment & 0xfff) == 0) + max_send_fragment -= 512; + + if (tot == 0 || wb->buf == NULL) { /* allocate jumbo buffer */ + ssl3_release_write_buffer(s); + + packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx, + EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE, + max_send_fragment, NULL); + + if (len >= 8 * (int)max_send_fragment) + packlen *= 8; + else + packlen *= 4; + + wb->buf = OPENSSL_malloc(packlen); + if (!wb->buf) { + SSLerr(SSL_F_SSL3_WRITE_BYTES, ERR_R_MALLOC_FAILURE); + return -1; + } + wb->len = packlen; + } else if (tot == len) { /* done? */ + OPENSSL_free(wb->buf); /* free jumbo buffer */ + wb->buf = NULL; + return tot; + } + + n = (len - tot); + for (;;) { + if (n < 4 * max_send_fragment) { + OPENSSL_free(wb->buf); /* free jumbo buffer */ + wb->buf = NULL; + break; + } + + if (s->s3->alert_dispatch) { + i = s->method->ssl_dispatch_alert(s); + if (i <= 0) { + s->s3->wnum = tot; + return i; + } + } + + if (n >= 8 * max_send_fragment) + nw = max_send_fragment * (mb_param.interleave = 8); + else + nw = max_send_fragment * (mb_param.interleave = 4); + + memcpy(aad, s->s3->write_sequence, 8); + aad[8] = type; + aad[9] = (unsigned char)(s->version >> 8); + aad[10] = (unsigned char)(s->version); + aad[11] = 0; + aad[12] = 0; + mb_param.out = NULL; + mb_param.inp = aad; + mb_param.len = nw; + + packlen = EVP_CIPHER_CTX_ctrl(s->enc_write_ctx, + EVP_CTRL_TLS1_1_MULTIBLOCK_AAD, + sizeof(mb_param), &mb_param); + + if (packlen <= 0 || packlen > (int)wb->len) { /* never happens */ + OPENSSL_free(wb->buf); /* free jumbo buffer */ + wb->buf = NULL; + break; + } + + mb_param.out = wb->buf; + mb_param.inp = &buf[tot]; + mb_param.len = nw; + + if (EVP_CIPHER_CTX_ctrl(s->enc_write_ctx, + EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT, + sizeof(mb_param), &mb_param) <= 0) + return -1; + + s->s3->write_sequence[7] += mb_param.interleave; + if (s->s3->write_sequence[7] < mb_param.interleave) { + int j = 6; + while (j >= 0 && (++s->s3->write_sequence[j--]) == 0) ; + } + + wb->offset = 0; + wb->left = packlen; + + s->s3->wpend_tot = nw; + s->s3->wpend_buf = &buf[tot]; + s->s3->wpend_type = type; + s->s3->wpend_ret = nw; + + i = ssl3_write_pending(s, type, &buf[tot], nw); + if (i <= 0) { + if (i < 0 && (!s->wbio || !BIO_should_retry(s->wbio))) { + OPENSSL_free(wb->buf); + wb->buf = NULL; + } + s->s3->wnum = tot; + return i; + } + if (i == (int)n) { + OPENSSL_free(wb->buf); /* free jumbo buffer */ + wb->buf = NULL; + return tot + i; + } + n -= i; + tot += i; + } + } else +#endif + if (tot == len) { /* done? */ + if (s->mode & SSL_MODE_RELEASE_BUFFERS && !SSL_IS_DTLS(s)) + ssl3_release_write_buffer(s); + + return tot; + } + + n = (len - tot); + for (;;) { + if (n > s->max_send_fragment) + nw = s->max_send_fragment; + else + nw = n; + + i = do_ssl3_write(s, type, &(buf[tot]), nw, 0); + if (i <= 0) { + /* XXX should we ssl3_release_write_buffer if i<0? */ + s->s3->wnum = tot; + return i; + } + + if ((i == (int)n) || + (type == SSL3_RT_APPLICATION_DATA && + (s->mode & SSL_MODE_ENABLE_PARTIAL_WRITE))) { + /* + * next chunk of data should get another prepended empty fragment + * in ciphersuites with known-IV weakness: + */ + s->s3->empty_fragment_done = 0; + + if ((i == (int)n) && s->mode & SSL_MODE_RELEASE_BUFFERS && + !SSL_IS_DTLS(s)) + ssl3_release_write_buffer(s); + + return tot + i; + } + + n -= i; + tot += i; + } +} + +static int do_ssl3_write(SSL *s, int type, const unsigned char *buf, + unsigned int len, int create_empty_fragment) +{ + unsigned char *p, *plen; + int i, mac_size, clear = 0; + int prefix_len = 0; + int eivlen; + long align = 0; + SSL3_RECORD *wr; + SSL3_BUFFER *wb = &(s->s3->wbuf); + SSL_SESSION *sess; + + /* + * first check if there is a SSL3_BUFFER still being written out. This + * will happen with non blocking IO + */ + if (wb->left != 0) + return (ssl3_write_pending(s, type, buf, len)); + + /* If we have an alert to send, lets send it */ + if (s->s3->alert_dispatch) { + i = s->method->ssl_dispatch_alert(s); + if (i <= 0) + return (i); + /* if it went, fall through and send more stuff */ + } + + if (wb->buf == NULL) + if (!ssl3_setup_write_buffer(s)) + return -1; + + if (len == 0 && !create_empty_fragment) + return 0; + + wr = &(s->s3->wrec); + sess = s->session; + + if ((sess == NULL) || + (s->enc_write_ctx == NULL) || + (EVP_MD_CTX_md(s->write_hash) == NULL)) { +#if 1 + clear = s->enc_write_ctx ? 0 : 1; /* must be AEAD cipher */ +#else + clear = 1; +#endif + mac_size = 0; + } else { + mac_size = EVP_MD_CTX_size(s->write_hash); + if (mac_size < 0) + goto err; + } + + /* + * 'create_empty_fragment' is true only when this function calls itself + */ + if (!clear && !create_empty_fragment && !s->s3->empty_fragment_done) { + /* + * countermeasure against known-IV weakness in CBC ciphersuites (see + * http://www.openssl.org/~bodo/tls-cbc.txt) + */ + + if (s->s3->need_empty_fragments && type == SSL3_RT_APPLICATION_DATA) { + /* + * recursive function call with 'create_empty_fragment' set; this + * prepares and buffers the data for an empty fragment (these + * 'prefix_len' bytes are sent out later together with the actual + * payload) + */ + prefix_len = do_ssl3_write(s, type, buf, 0, 1); + if (prefix_len <= 0) + goto err; + + if (prefix_len > + (SSL3_RT_HEADER_LENGTH + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD)) + { + /* insufficient space */ + SSLerr(SSL_F_DO_SSL3_WRITE, ERR_R_INTERNAL_ERROR); + goto err; + } + } + + s->s3->empty_fragment_done = 1; + } + + if (create_empty_fragment) { +#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 + /* + * extra fragment would be couple of cipher blocks, which would be + * multiple of SSL3_ALIGN_PAYLOAD, so if we want to align the real + * payload, then we can just pretent we simply have two headers. + */ + align = (long)wb->buf + 2 * SSL3_RT_HEADER_LENGTH; + align = (-align) & (SSL3_ALIGN_PAYLOAD - 1); +#endif + p = wb->buf + align; + wb->offset = align; + } else if (prefix_len) { + p = wb->buf + wb->offset + prefix_len; + } else { +#if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0 + align = (long)wb->buf + SSL3_RT_HEADER_LENGTH; + align = (-align) & (SSL3_ALIGN_PAYLOAD - 1); +#endif + p = wb->buf + align; + wb->offset = align; + } + + /* write the header */ + + *(p++) = type & 0xff; + wr->type = type; + + *(p++) = (s->version >> 8); + /* + * Some servers hang if iniatial client hello is larger than 256 bytes + * and record version number > TLS 1.0 + */ + if (s->state == SSL3_ST_CW_CLNT_HELLO_B + && !s->renegotiate && TLS1_get_version(s) > TLS1_VERSION) + *(p++) = 0x1; + else + *(p++) = s->version & 0xff; + + /* field where we are to write out packet length */ + plen = p; + p += 2; + /* Explicit IV length, block ciphers appropriate version flag */ + if (s->enc_write_ctx && SSL_USE_EXPLICIT_IV(s)) { + int mode = EVP_CIPHER_CTX_mode(s->enc_write_ctx); + if (mode == EVP_CIPH_CBC_MODE) { + eivlen = EVP_CIPHER_CTX_iv_length(s->enc_write_ctx); + if (eivlen <= 1) + eivlen = 0; + } + /* Need explicit part of IV for GCM mode */ + else if (mode == EVP_CIPH_GCM_MODE) + eivlen = EVP_GCM_TLS_EXPLICIT_IV_LEN; + else + eivlen = 0; + } else + eivlen = 0; + + /* lets setup the record stuff. */ + wr->data = p + eivlen; + wr->length = (int)len; + wr->input = (unsigned char *)buf; + + /* + * we now 'read' from wr->input, wr->length bytes into wr->data + */ + + /* first we compress */ + if (s->compress != NULL) { + if (!ssl3_do_compress(s)) { + SSLerr(SSL_F_DO_SSL3_WRITE, SSL_R_COMPRESSION_FAILURE); + goto err; + } + } else { + memcpy(wr->data, wr->input, wr->length); + wr->input = wr->data; + } + + /* + * we should still have the output to wr->data and the input from + * wr->input. Length should be wr->length. wr->data still points in the + * wb->buf + */ + + if (mac_size != 0) { + if (s->method->ssl3_enc->mac(s, &(p[wr->length + eivlen]), 1) < 0) + goto err; + wr->length += mac_size; + } + + wr->input = p; + wr->data = p; + + if (eivlen) { + /* + * if (RAND_pseudo_bytes(p, eivlen) <= 0) goto err; + */ + wr->length += eivlen; + } + + if (s->method->ssl3_enc->enc(s, 1) < 1) + goto err; + + /* record length after mac and block padding */ + s2n(wr->length, plen); + + if (s->msg_callback) + s->msg_callback(1, 0, SSL3_RT_HEADER, plen - 5, 5, s, + s->msg_callback_arg); + + /* + * we should now have wr->data pointing to the encrypted data, which is + * wr->length long + */ + wr->type = type; /* not needed but helps for debugging */ + wr->length += SSL3_RT_HEADER_LENGTH; + + if (create_empty_fragment) { + /* + * we are in a recursive call; just return the length, don't write + * out anything here + */ + return wr->length; + } + + /* now let's set up wb */ + wb->left = prefix_len + wr->length; + + /* + * memorize arguments so that ssl3_write_pending can detect bad write + * retries later + */ + s->s3->wpend_tot = len; + s->s3->wpend_buf = buf; + s->s3->wpend_type = type; + s->s3->wpend_ret = len; + + /* we now just need to write the buffer */ + return ssl3_write_pending(s, type, buf, len); + err: + return -1; +} + +/* if s->s3->wbuf.left != 0, we need to call this */ +int ssl3_write_pending(SSL *s, int type, const unsigned char *buf, + unsigned int len) +{ + int i; + SSL3_BUFFER *wb = &(s->s3->wbuf); + +/* XXXX */ + if ((s->s3->wpend_tot > (int)len) + || ((s->s3->wpend_buf != buf) && + !(s->mode & SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER)) + || (s->s3->wpend_type != type)) { + SSLerr(SSL_F_SSL3_WRITE_PENDING, SSL_R_BAD_WRITE_RETRY); + return (-1); + } + + for (;;) { + clear_sys_error(); + if (s->wbio != NULL) { + s->rwstate = SSL_WRITING; + i = BIO_write(s->wbio, + (char *)&(wb->buf[wb->offset]), + (unsigned int)wb->left); + } else { + SSLerr(SSL_F_SSL3_WRITE_PENDING, SSL_R_BIO_NOT_SET); + i = -1; + } + if (i == wb->left) { + wb->left = 0; + wb->offset += i; + s->rwstate = SSL_NOTHING; + return (s->s3->wpend_ret); + } else if (i <= 0) { + if (SSL_IS_DTLS(s)) { + /* + * For DTLS, just drop it. That's kind of the whole point in + * using a datagram service + */ + wb->left = 0; + } + return (i); + } + wb->offset += i; + wb->left -= i; + } +} + +/*- + * Return up to 'len' payload bytes received in 'type' records. + * 'type' is one of the following: + * + * - SSL3_RT_HANDSHAKE (when ssl3_get_message calls us) + * - SSL3_RT_APPLICATION_DATA (when ssl3_read calls us) + * - 0 (during a shutdown, no data has to be returned) + * + * If we don't have stored data to work from, read a SSL/TLS record first + * (possibly multiple records if we still don't have anything to return). + * + * This function must handle any surprises the peer may have for us, such as + * Alert records (e.g. close_notify), ChangeCipherSpec records (not really + * a surprise, but handled as if it were), or renegotiation requests. + * Also if record payloads contain fragments too small to process, we store + * them until there is enough for the respective protocol (the record protocol + * may use arbitrary fragmentation and even interleaving): + * Change cipher spec protocol + * just 1 byte needed, no need for keeping anything stored + * Alert protocol + * 2 bytes needed (AlertLevel, AlertDescription) + * Handshake protocol + * 4 bytes needed (HandshakeType, uint24 length) -- we just have + * to detect unexpected Client Hello and Hello Request messages + * here, anything else is handled by higher layers + * Application data protocol + * none of our business + */ +int ssl3_read_bytes(SSL *s, int type, unsigned char *buf, int len, int peek) +{ + int al, i, j, ret; + unsigned int n; + SSL3_RECORD *rr; + void (*cb) (const SSL *ssl, int type2, int val) = NULL; + + if (s->s3->rbuf.buf == NULL) /* Not initialized yet */ + if (!ssl3_setup_read_buffer(s)) + return (-1); + + if ((type && (type != SSL3_RT_APPLICATION_DATA) + && (type != SSL3_RT_HANDSHAKE)) || (peek + && (type != + SSL3_RT_APPLICATION_DATA))) { + SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR); + return -1; + } + + if ((type == SSL3_RT_HANDSHAKE) && (s->s3->handshake_fragment_len > 0)) + /* (partially) satisfy request from storage */ + { + unsigned char *src = s->s3->handshake_fragment; + unsigned char *dst = buf; + unsigned int k; + + /* peek == 0 */ + n = 0; + while ((len > 0) && (s->s3->handshake_fragment_len > 0)) { + *dst++ = *src++; + len--; + s->s3->handshake_fragment_len--; + n++; + } + /* move any remaining fragment bytes: */ + for (k = 0; k < s->s3->handshake_fragment_len; k++) + s->s3->handshake_fragment[k] = *src++; + return n; + } + + /* + * Now s->s3->handshake_fragment_len == 0 if type == SSL3_RT_HANDSHAKE. + */ + + if (!s->in_handshake && SSL_in_init(s)) { + /* type == SSL3_RT_APPLICATION_DATA */ + i = s->handshake_func(s); + if (i < 0) + return (i); + if (i == 0) { + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); + return (-1); + } + } + start: + s->rwstate = SSL_NOTHING; + + /*- + * s->s3->rrec.type - is the type of record + * s->s3->rrec.data, - data + * s->s3->rrec.off, - offset into 'data' for next read + * s->s3->rrec.length, - number of bytes. + */ + rr = &(s->s3->rrec); + + /* get new packet if necessary */ + if ((rr->length == 0) || (s->rstate == SSL_ST_READ_BODY)) { + ret = ssl3_get_record(s); + if (ret <= 0) + return (ret); + } + + /* we now have a packet which can be read and processed */ + + if (s->s3->change_cipher_spec /* set when we receive ChangeCipherSpec, + * reset by ssl3_get_finished */ + && (rr->type != SSL3_RT_HANDSHAKE)) { + al = SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_DATA_BETWEEN_CCS_AND_FINISHED); + goto f_err; + } + + /* + * If the other end has shut down, throw anything we read away (even in + * 'peek' mode) + */ + if (s->shutdown & SSL_RECEIVED_SHUTDOWN) { + rr->length = 0; + s->rwstate = SSL_NOTHING; + return (0); + } + + if (type == rr->type) { /* SSL3_RT_APPLICATION_DATA or + * SSL3_RT_HANDSHAKE */ + /* + * make sure that we are not getting application data when we are + * doing a handshake for the first time + */ + if (SSL_in_init(s) && (type == SSL3_RT_APPLICATION_DATA) && + (s->enc_read_ctx == NULL)) { + al = SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_APP_DATA_IN_HANDSHAKE); + goto f_err; + } + + if (len <= 0) + return (len); + + if ((unsigned int)len > rr->length) + n = rr->length; + else + n = (unsigned int)len; + + memcpy(buf, &(rr->data[rr->off]), n); + if (!peek) { + rr->length -= n; + rr->off += n; + if (rr->length == 0) { + s->rstate = SSL_ST_READ_HEADER; + rr->off = 0; + if (s->mode & SSL_MODE_RELEASE_BUFFERS + && s->s3->rbuf.left == 0) + ssl3_release_read_buffer(s); + } + } + return (n); + } + + /* + * If we get here, then type != rr->type; if we have a handshake message, + * then it was unexpected (Hello Request or Client Hello). + */ + + /* + * In case of record types for which we have 'fragment' storage, fill + * that so that we can process the data at a fixed place. + */ + { + unsigned int dest_maxlen = 0; + unsigned char *dest = NULL; + unsigned int *dest_len = NULL; + + if (rr->type == SSL3_RT_HANDSHAKE) { + dest_maxlen = sizeof s->s3->handshake_fragment; + dest = s->s3->handshake_fragment; + dest_len = &s->s3->handshake_fragment_len; + } else if (rr->type == SSL3_RT_ALERT) { + dest_maxlen = sizeof s->s3->alert_fragment; + dest = s->s3->alert_fragment; + dest_len = &s->s3->alert_fragment_len; + } +#ifndef OPENSSL_NO_HEARTBEATS + else if (rr->type == TLS1_RT_HEARTBEAT) { + tls1_process_heartbeat(s); + + /* Exit and notify application to read again */ + rr->length = 0; + s->rwstate = SSL_READING; + BIO_clear_retry_flags(SSL_get_rbio(s)); + BIO_set_retry_read(SSL_get_rbio(s)); + return (-1); + } +#endif + + if (dest_maxlen > 0) { + n = dest_maxlen - *dest_len; /* available space in 'dest' */ + if (rr->length < n) + n = rr->length; /* available bytes */ + + /* now move 'n' bytes: */ + while (n-- > 0) { + dest[(*dest_len)++] = rr->data[rr->off++]; + rr->length--; + } + + if (*dest_len < dest_maxlen) + goto start; /* fragment was too small */ + } + } + + /*- + * s->s3->handshake_fragment_len == 4 iff rr->type == SSL3_RT_HANDSHAKE; + * s->s3->alert_fragment_len == 2 iff rr->type == SSL3_RT_ALERT. + * (Possibly rr is 'empty' now, i.e. rr->length may be 0.) + */ + + /* If we are a client, check for an incoming 'Hello Request': */ + if ((!s->server) && + (s->s3->handshake_fragment_len >= 4) && + (s->s3->handshake_fragment[0] == SSL3_MT_HELLO_REQUEST) && + (s->session != NULL) && (s->session->cipher != NULL)) { + s->s3->handshake_fragment_len = 0; + + if ((s->s3->handshake_fragment[1] != 0) || + (s->s3->handshake_fragment[2] != 0) || + (s->s3->handshake_fragment[3] != 0)) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_BAD_HELLO_REQUEST); + goto f_err; + } + + if (s->msg_callback) + s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, + s->s3->handshake_fragment, 4, s, + s->msg_callback_arg); + + if (SSL_is_init_finished(s) && + !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS) && + !s->s3->renegotiate) { + ssl3_renegotiate(s); + if (ssl3_renegotiate_check(s)) { + i = s->handshake_func(s); + if (i < 0) + return (i); + if (i == 0) { + SSLerr(SSL_F_SSL3_READ_BYTES, + SSL_R_SSL_HANDSHAKE_FAILURE); + return (-1); + } + + if (!(s->mode & SSL_MODE_AUTO_RETRY)) { + if (s->s3->rbuf.left == 0) { /* no read-ahead left? */ + BIO *bio; + /* + * In the case where we try to read application data, + * but we trigger an SSL handshake, we return -1 with + * the retry option set. Otherwise renegotiation may + * cause nasty problems in the blocking world + */ + s->rwstate = SSL_READING; + bio = SSL_get_rbio(s); + BIO_clear_retry_flags(bio); + BIO_set_retry_read(bio); + return (-1); + } + } + } + } + /* + * we either finished a handshake or ignored the request, now try + * again to obtain the (application) data we were asked for + */ + goto start; + } + /* + * If we are a server and get a client hello when renegotiation isn't + * allowed send back a no renegotiation alert and carry on. WARNING: + * experimental code, needs reviewing (steve) + */ + if (s->server && + SSL_is_init_finished(s) && + !s->s3->send_connection_binding && + (s->version > SSL3_VERSION) && + (s->s3->handshake_fragment_len >= 4) && + (s->s3->handshake_fragment[0] == SSL3_MT_CLIENT_HELLO) && + (s->session != NULL) && (s->session->cipher != NULL) && + !(s->ctx->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) { + /* + * s->s3->handshake_fragment_len = 0; + */ + rr->length = 0; + ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_RENEGOTIATION); + goto start; + } + if (s->s3->alert_fragment_len >= 2) { + int alert_level = s->s3->alert_fragment[0]; + int alert_descr = s->s3->alert_fragment[1]; + + s->s3->alert_fragment_len = 0; + + if (s->msg_callback) + s->msg_callback(0, s->version, SSL3_RT_ALERT, + s->s3->alert_fragment, 2, s, s->msg_callback_arg); + + if (s->info_callback != NULL) + cb = s->info_callback; + else if (s->ctx->info_callback != NULL) + cb = s->ctx->info_callback; + + if (cb != NULL) { + j = (alert_level << 8) | alert_descr; + cb(s, SSL_CB_READ_ALERT, j); + } + + if (alert_level == SSL3_AL_WARNING) { + s->s3->warn_alert = alert_descr; + if (alert_descr == SSL_AD_CLOSE_NOTIFY) { + s->shutdown |= SSL_RECEIVED_SHUTDOWN; + return (0); + } + /* + * This is a warning but we receive it if we requested + * renegotiation and the peer denied it. Terminate with a fatal + * alert because if application tried to renegotiatie it + * presumably had a good reason and expects it to succeed. In + * future we might have a renegotiation where we don't care if + * the peer refused it where we carry on. + */ + else if (alert_descr == SSL_AD_NO_RENEGOTIATION) { + al = SSL_AD_HANDSHAKE_FAILURE; + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_NO_RENEGOTIATION); + goto f_err; + } +#ifdef SSL_AD_MISSING_SRP_USERNAME + else if (alert_descr == SSL_AD_MISSING_SRP_USERNAME) + return (0); +#endif + } else if (alert_level == SSL3_AL_FATAL) { + char tmp[16]; + + s->rwstate = SSL_NOTHING; + s->s3->fatal_alert = alert_descr; + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_AD_REASON_OFFSET + alert_descr); + BIO_snprintf(tmp, sizeof tmp, "%d", alert_descr); + ERR_add_error_data(2, "SSL alert number ", tmp); + s->shutdown |= SSL_RECEIVED_SHUTDOWN; + SSL_CTX_remove_session(s->ctx, s->session); + return (0); + } else { + al = SSL_AD_ILLEGAL_PARAMETER; + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_UNKNOWN_ALERT_TYPE); + goto f_err; + } + + goto start; + } + + if (s->shutdown & SSL_SENT_SHUTDOWN) { /* but we have not received a + * shutdown */ + s->rwstate = SSL_NOTHING; + rr->length = 0; + return (0); + } + + if (rr->type == SSL3_RT_CHANGE_CIPHER_SPEC) { + /* + * 'Change Cipher Spec' is just a single byte, so we know exactly + * what the record payload has to look like + */ + if ((rr->length != 1) || (rr->off != 0) || + (rr->data[0] != SSL3_MT_CCS)) { + al = SSL_AD_ILLEGAL_PARAMETER; + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_BAD_CHANGE_CIPHER_SPEC); + goto f_err; + } + + /* Check we have a cipher to change to */ + if (s->s3->tmp.new_cipher == NULL) { + al = SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_CCS_RECEIVED_EARLY); + goto f_err; + } + + if (!(s->s3->flags & SSL3_FLAGS_CCS_OK)) { + al = SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_CCS_RECEIVED_EARLY); + goto f_err; + } + + s->s3->flags &= ~SSL3_FLAGS_CCS_OK; + + rr->length = 0; + + if (s->msg_callback) + s->msg_callback(0, s->version, SSL3_RT_CHANGE_CIPHER_SPEC, + rr->data, 1, s, s->msg_callback_arg); + + s->s3->change_cipher_spec = 1; + if (!ssl3_do_change_cipher_spec(s)) + goto err; + else + goto start; + } + + /* + * Unexpected handshake message (Client Hello, or protocol violation) + */ + if ((s->s3->handshake_fragment_len >= 4) && !s->in_handshake) { + if (((s->state & SSL_ST_MASK) == SSL_ST_OK) && + !(s->s3->flags & SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS)) { +#if 0 /* worked only because C operator preferences + * are not as expected (and because this is + * not really needed for clients except for + * detecting protocol violations): */ + s->state = SSL_ST_BEFORE | (s->server) + ? SSL_ST_ACCEPT : SSL_ST_CONNECT; +#else + s->state = s->server ? SSL_ST_ACCEPT : SSL_ST_CONNECT; +#endif + s->renegotiate = 1; + s->new_session = 1; + } + i = s->handshake_func(s); + if (i < 0) + return (i); + if (i == 0) { + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_SSL_HANDSHAKE_FAILURE); + return (-1); + } + + if (!(s->mode & SSL_MODE_AUTO_RETRY)) { + if (s->s3->rbuf.left == 0) { /* no read-ahead left? */ + BIO *bio; + /* + * In the case where we try to read application data, but we + * trigger an SSL handshake, we return -1 with the retry + * option set. Otherwise renegotiation may cause nasty + * problems in the blocking world + */ + s->rwstate = SSL_READING; + bio = SSL_get_rbio(s); + BIO_clear_retry_flags(bio); + BIO_set_retry_read(bio); + return (-1); + } + } + goto start; + } + + switch (rr->type) { + default: +#ifndef OPENSSL_NO_TLS + /* + * TLS up to v1.1 just ignores unknown message types: TLS v1.2 give + * an unexpected message alert. + */ + if (s->version >= TLS1_VERSION && s->version <= TLS1_1_VERSION) { + rr->length = 0; + goto start; + } +#endif + al = SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_UNEXPECTED_RECORD); + goto f_err; + case SSL3_RT_CHANGE_CIPHER_SPEC: + case SSL3_RT_ALERT: + case SSL3_RT_HANDSHAKE: + /* + * we already handled all of these, with the possible exception of + * SSL3_RT_HANDSHAKE when s->in_handshake is set, but that should not + * happen when type != rr->type + */ + al = SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_READ_BYTES, ERR_R_INTERNAL_ERROR); + goto f_err; + case SSL3_RT_APPLICATION_DATA: + /* + * At this point, we were expecting handshake data, but have + * application data. If the library was running inside ssl3_read() + * (i.e. in_read_app_data is set) and it makes sense to read + * application data at this point (session renegotiation not yet + * started), we will indulge it. + */ + if (s->s3->in_read_app_data && + (s->s3->total_renegotiations != 0) && + (((s->state & SSL_ST_CONNECT) && + (s->state >= SSL3_ST_CW_CLNT_HELLO_A) && + (s->state <= SSL3_ST_CR_SRVR_HELLO_A) + ) || ((s->state & SSL_ST_ACCEPT) && + (s->state <= SSL3_ST_SW_HELLO_REQ_A) && + (s->state >= SSL3_ST_SR_CLNT_HELLO_A) + ) + )) { + s->s3->in_read_app_data = 2; + return (-1); + } else { + al = SSL_AD_UNEXPECTED_MESSAGE; + SSLerr(SSL_F_SSL3_READ_BYTES, SSL_R_UNEXPECTED_RECORD); + goto f_err; + } + } + /* not reached */ + + f_err: + ssl3_send_alert(s, SSL3_AL_FATAL, al); + err: + return (-1); +} + +int ssl3_do_change_cipher_spec(SSL *s) +{ + int i; + const char *sender; + int slen; + + if (s->state & SSL_ST_ACCEPT) + i = SSL3_CHANGE_CIPHER_SERVER_READ; + else + i = SSL3_CHANGE_CIPHER_CLIENT_READ; + + if (s->s3->tmp.key_block == NULL) { + if (s->session == NULL || s->session->master_key_length == 0) { + /* might happen if dtls1_read_bytes() calls this */ + SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, + SSL_R_CCS_RECEIVED_EARLY); + return (0); + } + + s->session->cipher = s->s3->tmp.new_cipher; + if (!s->method->ssl3_enc->setup_key_block(s)) + return (0); + } + + if (!s->method->ssl3_enc->change_cipher_state(s, i)) + return (0); + + /* + * we have to record the message digest at this point so we can get it + * before we read the finished message + */ + if (s->state & SSL_ST_CONNECT) { + sender = s->method->ssl3_enc->server_finished_label; + slen = s->method->ssl3_enc->server_finished_label_len; + } else { + sender = s->method->ssl3_enc->client_finished_label; + slen = s->method->ssl3_enc->client_finished_label_len; + } + + i = s->method->ssl3_enc->final_finish_mac(s, + sender, slen, + s->s3->tmp.peer_finish_md); + if (i == 0) { + SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, ERR_R_INTERNAL_ERROR); + return 0; + } + s->s3->tmp.peer_finish_md_len = i; + + return (1); +} + +int ssl3_send_alert(SSL *s, int level, int desc) +{ + /* Map tls/ssl alert value to correct one */ + desc = s->method->ssl3_enc->alert_value(desc); + if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION) + desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have + * protocol_version alerts */ + if (desc < 0) + return -1; + /* If a fatal one, remove from cache */ + if ((level == 2) && (s->session != NULL)) + SSL_CTX_remove_session(s->ctx, s->session); + + s->s3->alert_dispatch = 1; + s->s3->send_alert[0] = level; + s->s3->send_alert[1] = desc; + if (s->s3->wbuf.left == 0) /* data still being written out? */ + return s->method->ssl_dispatch_alert(s); + /* + * else data is still being written out, we will get written some time in + * the future + */ + return -1; +} + +int ssl3_dispatch_alert(SSL *s) +{ + int i, j; + void (*cb) (const SSL *ssl, int type, int val) = NULL; + + s->s3->alert_dispatch = 0; + i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], 2, 0); + if (i <= 0) { + s->s3->alert_dispatch = 1; + } else { + /* + * Alert sent to BIO. If it is important, flush it now. If the + * message does not get sent due to non-blocking IO, we will not + * worry too much. + */ + if (s->s3->send_alert[0] == SSL3_AL_FATAL) + (void)BIO_flush(s->wbio); + + if (s->msg_callback) + s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert, + 2, s, s->msg_callback_arg); + + if (s->info_callback != NULL) + cb = s->info_callback; + else if (s->ctx->info_callback != NULL) + cb = s->ctx->info_callback; + + if (cb != NULL) { + j = (s->s3->send_alert[0] << 8) | s->s3->send_alert[1]; + cb(s, SSL_CB_WRITE_ALERT, j); + } + } + return (i); +} |