479 lines
11 KiB
C
479 lines
11 KiB
C
/* ssl/s2_lib.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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#include "ssl_locl.h"
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#ifndef OPENSSL_NO_SSL2
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#include <stdio.h>
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#include <openssl/objects.h>
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#include <openssl/evp.h>
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#include <openssl/md5.h>
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const char ssl2_version_str[]="SSLv2" OPENSSL_VERSION_PTEXT;
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#define SSL2_NUM_CIPHERS (sizeof(ssl2_ciphers)/sizeof(SSL_CIPHER))
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/* list of available SSLv2 ciphers (sorted by id) */
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OPENSSL_GLOBAL SSL_CIPHER ssl2_ciphers[]={
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/* NULL_WITH_MD5 v3 */
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#if 0
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{
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1,
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SSL2_TXT_NULL_WITH_MD5,
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SSL2_CK_NULL_WITH_MD5,
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SSL_kRSA|SSL_aRSA|SSL_eNULL|SSL_MD5|SSL_SSLV2,
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SSL_EXPORT|SSL_EXP40|SSL_STRONG_NONE,
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0,
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0,
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0,
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SSL_ALL_CIPHERS,
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SSL_ALL_STRENGTHS,
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},
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#endif
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/* RC4_128_WITH_MD5 */
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{
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1,
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SSL2_TXT_RC4_128_WITH_MD5,
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SSL2_CK_RC4_128_WITH_MD5,
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SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
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SSL_NOT_EXP|SSL_MEDIUM,
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0,
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128,
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128,
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SSL_ALL_CIPHERS,
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SSL_ALL_STRENGTHS,
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},
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/* RC4_128_EXPORT40_WITH_MD5 */
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{
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1,
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SSL2_TXT_RC4_128_EXPORT40_WITH_MD5,
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SSL2_CK_RC4_128_EXPORT40_WITH_MD5,
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SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
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SSL_EXPORT|SSL_EXP40,
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SSL2_CF_5_BYTE_ENC,
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40,
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128,
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SSL_ALL_CIPHERS,
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SSL_ALL_STRENGTHS,
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},
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/* RC2_128_CBC_WITH_MD5 */
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{
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1,
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SSL2_TXT_RC2_128_CBC_WITH_MD5,
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SSL2_CK_RC2_128_CBC_WITH_MD5,
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SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
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SSL_NOT_EXP|SSL_MEDIUM,
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0,
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128,
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128,
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SSL_ALL_CIPHERS,
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SSL_ALL_STRENGTHS,
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},
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/* RC2_128_CBC_EXPORT40_WITH_MD5 */
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{
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1,
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SSL2_TXT_RC2_128_CBC_EXPORT40_WITH_MD5,
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SSL2_CK_RC2_128_CBC_EXPORT40_WITH_MD5,
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SSL_kRSA|SSL_aRSA|SSL_RC2|SSL_MD5|SSL_SSLV2,
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SSL_EXPORT|SSL_EXP40,
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SSL2_CF_5_BYTE_ENC,
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40,
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128,
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SSL_ALL_CIPHERS,
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SSL_ALL_STRENGTHS,
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},
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/* IDEA_128_CBC_WITH_MD5 */
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#ifndef OPENSSL_NO_IDEA
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{
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1,
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SSL2_TXT_IDEA_128_CBC_WITH_MD5,
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SSL2_CK_IDEA_128_CBC_WITH_MD5,
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SSL_kRSA|SSL_aRSA|SSL_IDEA|SSL_MD5|SSL_SSLV2,
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SSL_NOT_EXP|SSL_MEDIUM,
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0,
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128,
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128,
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SSL_ALL_CIPHERS,
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SSL_ALL_STRENGTHS,
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},
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#endif
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/* DES_64_CBC_WITH_MD5 */
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{
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1,
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SSL2_TXT_DES_64_CBC_WITH_MD5,
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SSL2_CK_DES_64_CBC_WITH_MD5,
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SSL_kRSA|SSL_aRSA|SSL_DES|SSL_MD5|SSL_SSLV2,
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SSL_NOT_EXP|SSL_LOW,
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0,
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56,
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56,
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SSL_ALL_CIPHERS,
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SSL_ALL_STRENGTHS,
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},
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/* DES_192_EDE3_CBC_WITH_MD5 */
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{
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1,
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SSL2_TXT_DES_192_EDE3_CBC_WITH_MD5,
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SSL2_CK_DES_192_EDE3_CBC_WITH_MD5,
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SSL_kRSA|SSL_aRSA|SSL_3DES|SSL_MD5|SSL_SSLV2,
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SSL_NOT_EXP|SSL_HIGH,
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0,
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168,
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168,
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SSL_ALL_CIPHERS,
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SSL_ALL_STRENGTHS,
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},
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/* RC4_64_WITH_MD5 */
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#if 0
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{
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1,
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SSL2_TXT_RC4_64_WITH_MD5,
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SSL2_CK_RC4_64_WITH_MD5,
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SSL_kRSA|SSL_aRSA|SSL_RC4|SSL_MD5|SSL_SSLV2,
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SSL_NOT_EXP|SSL_LOW,
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SSL2_CF_8_BYTE_ENC,
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64,
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64,
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SSL_ALL_CIPHERS,
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SSL_ALL_STRENGTHS,
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},
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#endif
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/* NULL SSLeay (testing) */
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#if 0
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{
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0,
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SSL2_TXT_NULL,
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SSL2_CK_NULL,
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0,
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SSL_STRONG_NONE,
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0,
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0,
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0,
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SSL_ALL_CIPHERS,
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SSL_ALL_STRENGTHS,
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},
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#endif
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/* end of list :-) */
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};
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long ssl2_default_timeout(void)
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{
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return(300);
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}
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IMPLEMENT_ssl2_meth_func(sslv2_base_method,
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ssl_undefined_function,
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ssl_undefined_function,
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ssl_bad_method)
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int ssl2_num_ciphers(void)
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{
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return(SSL2_NUM_CIPHERS);
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}
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SSL_CIPHER *ssl2_get_cipher(unsigned int u)
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{
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if (u < SSL2_NUM_CIPHERS)
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return(&(ssl2_ciphers[SSL2_NUM_CIPHERS-1-u]));
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else
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return(NULL);
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}
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int ssl2_pending(const SSL *s)
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{
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return SSL_in_init(s) ? 0 : s->s2->ract_data_length;
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}
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int ssl2_new(SSL *s)
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{
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SSL2_STATE *s2;
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if ((s2=OPENSSL_malloc(sizeof *s2)) == NULL) goto err;
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memset(s2,0,sizeof *s2);
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#if SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER + 3 > SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER + 2
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# error "assertion failed"
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#endif
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if ((s2->rbuf=OPENSSL_malloc(
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SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+2)) == NULL) goto err;
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/* wbuf needs one byte more because when using two-byte headers,
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* we leave the first byte unused in do_ssl_write (s2_pkt.c) */
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if ((s2->wbuf=OPENSSL_malloc(
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SSL2_MAX_RECORD_LENGTH_2_BYTE_HEADER+3)) == NULL) goto err;
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s->s2=s2;
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ssl2_clear(s);
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return(1);
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err:
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if (s2 != NULL)
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{
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if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
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if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
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OPENSSL_free(s2);
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}
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return(0);
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}
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void ssl2_free(SSL *s)
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{
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SSL2_STATE *s2;
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if(s == NULL)
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return;
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s2=s->s2;
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if (s2->rbuf != NULL) OPENSSL_free(s2->rbuf);
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if (s2->wbuf != NULL) OPENSSL_free(s2->wbuf);
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OPENSSL_cleanse(s2,sizeof *s2);
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OPENSSL_free(s2);
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s->s2=NULL;
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}
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void ssl2_clear(SSL *s)
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{
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SSL2_STATE *s2;
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unsigned char *rbuf,*wbuf;
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s2=s->s2;
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rbuf=s2->rbuf;
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wbuf=s2->wbuf;
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memset(s2,0,sizeof *s2);
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s2->rbuf=rbuf;
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s2->wbuf=wbuf;
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s2->clear_text=1;
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s->packet=s2->rbuf;
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s->version=SSL2_VERSION;
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s->packet_length=0;
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}
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long ssl2_ctrl(SSL *s, int cmd, long larg, void *parg)
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{
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int ret=0;
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switch(cmd)
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{
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case SSL_CTRL_GET_SESSION_REUSED:
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ret=s->hit;
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break;
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default:
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break;
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}
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return(ret);
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}
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long ssl2_callback_ctrl(SSL *s, int cmd, void (*fp)(void))
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{
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return(0);
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}
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long ssl2_ctx_ctrl(SSL_CTX *ctx, int cmd, long larg, void *parg)
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{
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return(0);
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}
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long ssl2_ctx_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)(void))
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{
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return(0);
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}
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/* This function needs to check if the ciphers required are actually
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* available */
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SSL_CIPHER *ssl2_get_cipher_by_char(const unsigned char *p)
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{
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SSL_CIPHER c,*cp;
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unsigned long id;
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id=0x02000000L|((unsigned long)p[0]<<16L)|
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((unsigned long)p[1]<<8L)|(unsigned long)p[2];
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c.id=id;
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cp = (SSL_CIPHER *)OBJ_bsearch((char *)&c,
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(char *)ssl2_ciphers,
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SSL2_NUM_CIPHERS,sizeof(SSL_CIPHER),
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FP_ICC ssl_cipher_id_cmp);
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if ((cp == NULL) || (cp->valid == 0))
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return NULL;
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else
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return cp;
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}
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int ssl2_put_cipher_by_char(const SSL_CIPHER *c, unsigned char *p)
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{
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long l;
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if (p != NULL)
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{
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l=c->id;
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if ((l & 0xff000000) != 0x02000000) return(0);
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p[0]=((unsigned char)(l>>16L))&0xFF;
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p[1]=((unsigned char)(l>> 8L))&0xFF;
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p[2]=((unsigned char)(l ))&0xFF;
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}
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return(3);
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}
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int ssl2_generate_key_material(SSL *s)
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{
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unsigned int i;
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EVP_MD_CTX ctx;
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unsigned char *km;
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unsigned char c='0';
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const EVP_MD *md5;
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md5 = EVP_md5();
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#ifdef CHARSET_EBCDIC
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c = os_toascii['0']; /* Must be an ASCII '0', not EBCDIC '0',
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see SSLv2 docu */
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#endif
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EVP_MD_CTX_init(&ctx);
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km=s->s2->key_material;
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if (s->session->master_key_length < 0 ||
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s->session->master_key_length > (int)sizeof(s->session->master_key))
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{
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SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
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return 0;
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}
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for (i=0; i<s->s2->key_material_length; i += EVP_MD_size(md5))
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{
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if (((km - s->s2->key_material) + EVP_MD_size(md5)) >
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(int)sizeof(s->s2->key_material))
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{
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/* EVP_DigestFinal_ex() below would write beyond buffer */
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SSLerr(SSL_F_SSL2_GENERATE_KEY_MATERIAL, ERR_R_INTERNAL_ERROR);
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return 0;
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}
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EVP_DigestInit_ex(&ctx, md5, NULL);
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OPENSSL_assert(s->session->master_key_length >= 0
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&& s->session->master_key_length
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< (int)sizeof(s->session->master_key));
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EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length);
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EVP_DigestUpdate(&ctx,&c,1);
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c++;
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EVP_DigestUpdate(&ctx,s->s2->challenge,s->s2->challenge_length);
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EVP_DigestUpdate(&ctx,s->s2->conn_id,s->s2->conn_id_length);
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EVP_DigestFinal_ex(&ctx,km,NULL);
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km += EVP_MD_size(md5);
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}
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EVP_MD_CTX_cleanup(&ctx);
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return 1;
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}
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void ssl2_return_error(SSL *s, int err)
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{
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if (!s->error)
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{
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s->error=3;
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s->error_code=err;
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ssl2_write_error(s);
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}
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}
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void ssl2_write_error(SSL *s)
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{
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unsigned char buf[3];
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int i,error;
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buf[0]=SSL2_MT_ERROR;
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buf[1]=(s->error_code>>8)&0xff;
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buf[2]=(s->error_code)&0xff;
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/* state=s->rwstate;*/
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error=s->error; /* number of bytes left to write */
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s->error=0;
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OPENSSL_assert(error >= 0 && error <= (int)sizeof(buf));
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i=ssl2_write(s,&(buf[3-error]),error);
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/* if (i == error) s->rwstate=state; */
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if (i < 0)
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s->error=error;
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else
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{
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s->error=error-i;
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if (s->error == 0)
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if (s->msg_callback)
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s->msg_callback(1, s->version, 0, buf, 3, s, s->msg_callback_arg); /* ERROR */
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}
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}
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int ssl2_shutdown(SSL *s)
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{
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s->shutdown=(SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN);
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return(1);
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}
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#else /* !OPENSSL_NO_SSL2 */
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# if PEDANTIC
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static void *dummy=&dummy;
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# endif
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#endif
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