| /* 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 <openssl/opensslconf.h> |
| #if !defined(OPENSSL_SYS_STARBOARD) |
| #include <stdio.h> |
| #endif // !defined(OPENSSL_SYS_STARBOARD) |
| #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); |
| OPENSSL_port_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; |
| |
| ssl_replace_hash(&s->read_hash, m); |
| #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 |
| OPENSSL_port_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; |
| ssl_replace_hash(&s->write_hash, m); |
| #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 |
| OPENSSL_port_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); |
| OPENSSL_port_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)); |
| |
| 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)) { |
| OPENSSL_port_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. |
| */ |
| OPENSSL_port_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 *)); |
| OPENSSL_port_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); |
| EVP_DigestUpdate(&ctx, s->session->master_key, |
| s->session->master_key_length); |
| EVP_DigestUpdate(&ctx, ssl3_pad_1, npad); |
| EVP_DigestFinal_ex(&ctx, md_buf, &i); |
| |
| EVP_DigestInit_ex(&ctx, EVP_MD_CTX_md(&ctx), NULL); |
| EVP_DigestUpdate(&ctx, s->session->master_key, |
| s->session->master_key_length); |
| EVP_DigestUpdate(&ctx, ssl3_pad_2, npad); |
| EVP_DigestUpdate(&ctx, md_buf, i); |
| EVP_DigestFinal_ex(&ctx, p, &ret); |
| |
| 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; |
| OPENSSL_port_memcpy(header + j, mac_sec, md_size); |
| j += md_size; |
| OPENSSL_port_memcpy(header + j, ssl3_pad_1, npad); |
| j += npad; |
| OPENSSL_port_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 */ |
| ssl3_cbc_digest_record(hash, |
| md, &md_size, |
| header, rec->input, |
| rec->length + md_size, orig_len, |
| mac_sec, md_size, 1); |
| } else { |
| unsigned int md_size_u; |
| /* Chop the digest off the end :-) */ |
| EVP_MD_CTX_init(&md_ctx); |
| |
| EVP_MD_CTX_copy_ex(&md_ctx, hash); |
| EVP_DigestUpdate(&md_ctx, mac_sec, md_size); |
| EVP_DigestUpdate(&md_ctx, ssl3_pad_1, npad); |
| EVP_DigestUpdate(&md_ctx, seq, 8); |
| rec_char = rec->type; |
| EVP_DigestUpdate(&md_ctx, &rec_char, 1); |
| p = md; |
| s2n(rec->length, p); |
| EVP_DigestUpdate(&md_ctx, md, 2); |
| EVP_DigestUpdate(&md_ctx, rec->input, rec->length); |
| EVP_DigestFinal_ex(&md_ctx, md, NULL); |
| |
| EVP_MD_CTX_copy_ex(&md_ctx, hash); |
| EVP_DigestUpdate(&md_ctx, mac_sec, md_size); |
| EVP_DigestUpdate(&md_ctx, ssl3_pad_2, npad); |
| EVP_DigestUpdate(&md_ctx, md, md_size); |
| EVP_DigestFinal_ex(&md_ctx, md, &md_size_u); |
| 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; |
| |
| EVP_MD_CTX_init(&ctx); |
| for (i = 0; i < 3; i++) { |
| EVP_DigestInit_ex(&ctx, s->ctx->sha1, NULL); |
| EVP_DigestUpdate(&ctx, salt[i], OPENSSL_port_strlen((const char *)salt[i])); |
| EVP_DigestUpdate(&ctx, p, len); |
| EVP_DigestUpdate(&ctx, &(s->s3->client_random[0]), SSL3_RANDOM_SIZE); |
| EVP_DigestUpdate(&ctx, &(s->s3->server_random[0]), SSL3_RANDOM_SIZE); |
| EVP_DigestFinal_ex(&ctx, buf, &n); |
| |
| EVP_DigestInit_ex(&ctx, s->ctx->md5, NULL); |
| EVP_DigestUpdate(&ctx, p, len); |
| EVP_DigestUpdate(&ctx, buf, n); |
| EVP_DigestFinal_ex(&ctx, out, &n); |
| out += n; |
| ret += n; |
| } |
| EVP_MD_CTX_cleanup(&ctx); |
| 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); |
| } |
| } |
