970 lines
33 KiB
C
970 lines
33 KiB
C
/* ssl/s3_enc.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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/* ====================================================================
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* Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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/* ====================================================================
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* Copyright 2005 Nokia. All rights reserved.
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*
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* The portions of the attached software ("Contribution") is developed by
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* Nokia Corporation and is licensed pursuant to the OpenSSL open source
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* license.
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*
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* The Contribution, originally written by Mika Kousa and Pasi Eronen of
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* Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
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* support (see RFC 4279) to OpenSSL.
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*
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* No patent licenses or other rights except those expressly stated in
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* the OpenSSL open source license shall be deemed granted or received
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* expressly, by implication, estoppel, or otherwise.
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*
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* No assurances are provided by Nokia that the Contribution does not
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* infringe the patent or other intellectual property rights of any third
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* party or that the license provides you with all the necessary rights
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* to make use of the Contribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
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* ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
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* SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
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* OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
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* OTHERWISE.
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*/
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#include <stdio.h>
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#include "ssl_locl.h"
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#include <openssl/evp.h>
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#include <openssl/md5.h>
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static unsigned char ssl3_pad_1[48] = {
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0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
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0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
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0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
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0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
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0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36,
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0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36, 0x36
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};
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static unsigned char ssl3_pad_2[48] = {
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0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
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0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
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0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
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0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
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0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c,
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0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c, 0x5c
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};
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static int ssl3_handshake_mac(SSL *s, int md_nid,
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const char *sender, int len, unsigned char *p);
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static int ssl3_generate_key_block(SSL *s, unsigned char *km, int num)
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{
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EVP_MD_CTX m5;
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EVP_MD_CTX s1;
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unsigned char buf[16], smd[SHA_DIGEST_LENGTH];
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unsigned char c = 'A';
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unsigned int i, j, k;
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#ifdef CHARSET_EBCDIC
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c = os_toascii[c]; /* 'A' in ASCII */
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#endif
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k = 0;
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EVP_MD_CTX_init(&m5);
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EVP_MD_CTX_set_flags(&m5, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
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EVP_MD_CTX_init(&s1);
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for (i = 0; (int)i < num; i += MD5_DIGEST_LENGTH) {
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k++;
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if (k > sizeof buf) {
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/* bug: 'buf' is too small for this ciphersuite */
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SSLerr(SSL_F_SSL3_GENERATE_KEY_BLOCK, ERR_R_INTERNAL_ERROR);
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return 0;
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}
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for (j = 0; j < k; j++)
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buf[j] = c;
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c++;
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EVP_DigestInit_ex(&s1, EVP_sha1(), NULL);
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EVP_DigestUpdate(&s1, buf, k);
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EVP_DigestUpdate(&s1, s->session->master_key,
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s->session->master_key_length);
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EVP_DigestUpdate(&s1, s->s3->server_random, SSL3_RANDOM_SIZE);
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EVP_DigestUpdate(&s1, s->s3->client_random, SSL3_RANDOM_SIZE);
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EVP_DigestFinal_ex(&s1, smd, NULL);
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EVP_DigestInit_ex(&m5, EVP_md5(), NULL);
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EVP_DigestUpdate(&m5, s->session->master_key,
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s->session->master_key_length);
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EVP_DigestUpdate(&m5, smd, SHA_DIGEST_LENGTH);
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if ((int)(i + MD5_DIGEST_LENGTH) > num) {
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EVP_DigestFinal_ex(&m5, smd, NULL);
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memcpy(km, smd, (num - i));
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} else
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EVP_DigestFinal_ex(&m5, km, NULL);
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km += MD5_DIGEST_LENGTH;
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}
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OPENSSL_cleanse(smd, SHA_DIGEST_LENGTH);
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EVP_MD_CTX_cleanup(&m5);
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EVP_MD_CTX_cleanup(&s1);
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return 1;
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}
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int ssl3_change_cipher_state(SSL *s, int which)
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{
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unsigned char *p, *mac_secret;
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unsigned char exp_key[EVP_MAX_KEY_LENGTH];
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unsigned char exp_iv[EVP_MAX_IV_LENGTH];
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unsigned char *ms, *key, *iv, *er1, *er2;
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EVP_CIPHER_CTX *dd;
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const EVP_CIPHER *c;
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#ifndef OPENSSL_NO_COMP
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COMP_METHOD *comp;
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#endif
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const EVP_MD *m;
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EVP_MD_CTX md;
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int is_exp, n, i, j, k, cl;
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int reuse_dd = 0;
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is_exp = SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
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c = s->s3->tmp.new_sym_enc;
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m = s->s3->tmp.new_hash;
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/* m == NULL will lead to a crash later */
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OPENSSL_assert(m);
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#ifndef OPENSSL_NO_COMP
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if (s->s3->tmp.new_compression == NULL)
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comp = NULL;
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else
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comp = s->s3->tmp.new_compression->method;
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#endif
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if (which & SSL3_CC_READ) {
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if (s->enc_read_ctx != NULL)
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reuse_dd = 1;
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else if ((s->enc_read_ctx =
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OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
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goto err;
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else
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/*
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* make sure it's intialized in case we exit later with an error
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*/
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EVP_CIPHER_CTX_init(s->enc_read_ctx);
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dd = s->enc_read_ctx;
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if (ssl_replace_hash(&s->read_hash, m) == NULL) {
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SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
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goto err2;
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}
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#ifndef OPENSSL_NO_COMP
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/* COMPRESS */
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if (s->expand != NULL) {
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COMP_CTX_free(s->expand);
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s->expand = NULL;
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}
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if (comp != NULL) {
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s->expand = COMP_CTX_new(comp);
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if (s->expand == NULL) {
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SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
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SSL_R_COMPRESSION_LIBRARY_ERROR);
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goto err2;
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}
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if (s->s3->rrec.comp == NULL)
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s->s3->rrec.comp = (unsigned char *)
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OPENSSL_malloc(SSL3_RT_MAX_PLAIN_LENGTH);
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if (s->s3->rrec.comp == NULL)
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goto err;
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}
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#endif
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memset(&(s->s3->read_sequence[0]), 0, 8);
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mac_secret = &(s->s3->read_mac_secret[0]);
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} else {
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if (s->enc_write_ctx != NULL)
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reuse_dd = 1;
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else if ((s->enc_write_ctx =
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OPENSSL_malloc(sizeof(EVP_CIPHER_CTX))) == NULL)
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goto err;
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else
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/*
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* make sure it's intialized in case we exit later with an error
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*/
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EVP_CIPHER_CTX_init(s->enc_write_ctx);
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dd = s->enc_write_ctx;
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if (ssl_replace_hash(&s->write_hash, m) == NULL) {
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SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
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goto err2;
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}
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#ifndef OPENSSL_NO_COMP
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/* COMPRESS */
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if (s->compress != NULL) {
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COMP_CTX_free(s->compress);
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s->compress = NULL;
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}
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if (comp != NULL) {
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s->compress = COMP_CTX_new(comp);
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if (s->compress == NULL) {
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SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE,
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SSL_R_COMPRESSION_LIBRARY_ERROR);
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goto err2;
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}
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}
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#endif
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memset(&(s->s3->write_sequence[0]), 0, 8);
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mac_secret = &(s->s3->write_mac_secret[0]);
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}
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if (reuse_dd)
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EVP_CIPHER_CTX_cleanup(dd);
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p = s->s3->tmp.key_block;
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i = EVP_MD_size(m);
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if (i < 0)
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goto err2;
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cl = EVP_CIPHER_key_length(c);
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j = is_exp ? (cl < SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher) ?
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cl : SSL_C_EXPORT_KEYLENGTH(s->s3->tmp.new_cipher)) : cl;
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/* Was j=(is_exp)?5:EVP_CIPHER_key_length(c); */
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k = EVP_CIPHER_iv_length(c);
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if ((which == SSL3_CHANGE_CIPHER_CLIENT_WRITE) ||
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(which == SSL3_CHANGE_CIPHER_SERVER_READ)) {
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ms = &(p[0]);
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n = i + i;
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key = &(p[n]);
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n += j + j;
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iv = &(p[n]);
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n += k + k;
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er1 = &(s->s3->client_random[0]);
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er2 = &(s->s3->server_random[0]);
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} else {
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n = i;
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ms = &(p[n]);
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n += i + j;
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key = &(p[n]);
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n += j + k;
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iv = &(p[n]);
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n += k;
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er1 = &(s->s3->server_random[0]);
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er2 = &(s->s3->client_random[0]);
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}
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if (n > s->s3->tmp.key_block_length) {
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SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
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goto err2;
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}
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EVP_MD_CTX_init(&md);
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memcpy(mac_secret, ms, i);
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if (is_exp) {
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/*
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* In here I set both the read and write key/iv to the same value
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* since only the correct one will be used :-).
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*/
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EVP_DigestInit_ex(&md, EVP_md5(), NULL);
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EVP_DigestUpdate(&md, key, j);
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EVP_DigestUpdate(&md, er1, SSL3_RANDOM_SIZE);
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EVP_DigestUpdate(&md, er2, SSL3_RANDOM_SIZE);
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EVP_DigestFinal_ex(&md, &(exp_key[0]), NULL);
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key = &(exp_key[0]);
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if (k > 0) {
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EVP_DigestInit_ex(&md, EVP_md5(), NULL);
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EVP_DigestUpdate(&md, er1, SSL3_RANDOM_SIZE);
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EVP_DigestUpdate(&md, er2, SSL3_RANDOM_SIZE);
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EVP_DigestFinal_ex(&md, &(exp_iv[0]), NULL);
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iv = &(exp_iv[0]);
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}
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}
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s->session->key_arg_length = 0;
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EVP_CipherInit_ex(dd, c, NULL, key, iv, (which & SSL3_CC_WRITE));
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#ifdef OPENSSL_SSL_TRACE_CRYPTO
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if (s->msg_callback) {
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int wh = which & SSL3_CC_WRITE ?
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TLS1_RT_CRYPTO_WRITE : TLS1_RT_CRYPTO_READ;
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s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_MAC,
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mac_secret, EVP_MD_size(m), s, s->msg_callback_arg);
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if (c->key_len)
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s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
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key, c->key_len, s, s->msg_callback_arg);
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if (k) {
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s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_IV,
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iv, k, s, s->msg_callback_arg);
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}
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}
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#endif
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OPENSSL_cleanse(&(exp_key[0]), sizeof(exp_key));
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OPENSSL_cleanse(&(exp_iv[0]), sizeof(exp_iv));
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EVP_MD_CTX_cleanup(&md);
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return (1);
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err:
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SSLerr(SSL_F_SSL3_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
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err2:
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return (0);
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}
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int ssl3_setup_key_block(SSL *s)
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{
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unsigned char *p;
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const EVP_CIPHER *c;
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const EVP_MD *hash;
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int num;
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int ret = 0;
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SSL_COMP *comp;
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if (s->s3->tmp.key_block_length != 0)
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return (1);
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if (!ssl_cipher_get_evp(s->session, &c, &hash, NULL, NULL, &comp)) {
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SSLerr(SSL_F_SSL3_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
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return (0);
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}
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s->s3->tmp.new_sym_enc = c;
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s->s3->tmp.new_hash = hash;
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#ifdef OPENSSL_NO_COMP
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s->s3->tmp.new_compression = NULL;
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#else
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s->s3->tmp.new_compression = comp;
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#endif
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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);
|
|
}
|
|
}
|