lib/libssl/t1_reneg.c

   1 /* $OpenBSD: t1_reneg.c,v 1.15 2017/02/07 02:08:38 beck Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2009 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111
 112 #include <stdio.h>
 113
 114 #include <openssl/objects.h>
 115
 116 #include "ssl_locl.h"
 117 #include "bytestring.h"
 118
 119 /* Add the client's renegotiation binding */
 120 int
 121 ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
 122     int maxlen)
 123 {
 124         if (p) {
 125                 if ((S3I(s)->previous_client_finished_len + 1) > maxlen) {
 126                         SSLerror(s, SSL_R_RENEGOTIATE_EXT_TOO_LONG);
 127                         return 0;
 128                 }
 129
 130                 /* Length byte */
 131                 *p = S3I(s)->previous_client_finished_len;
 132                 p++;
 133
 134                 memcpy(p, S3I(s)->previous_client_finished,
 135                     S3I(s)->previous_client_finished_len);
 136
 137         }
 138
 139         *len = S3I(s)->previous_client_finished_len + 1;
 140
 141         return 1;
 142 }
 143
 144 /* Parse the client's renegotiation binding and abort if it's not
 145    right */
 146 int
 147 ssl_parse_clienthello_renegotiate_ext(SSL *s, const unsigned char *d, int len,
 148     int *al)
 149 {
 150         CBS cbs, reneg;
 151
 152         if (len < 0) {
 153                 SSLerror(s, SSL_R_RENEGOTIATION_ENCODING_ERR);
 154                 *al = SSL_AD_ILLEGAL_PARAMETER;
 155                 return 0;
 156         }
 157
 158         CBS_init(&cbs, d, len);
 159         if (!CBS_get_u8_length_prefixed(&cbs, &reneg) ||
 160             /* Consistency check */
 161             CBS_len(&cbs) != 0) {
 162                 SSLerror(s, SSL_R_RENEGOTIATION_ENCODING_ERR);
 163                 *al = SSL_AD_ILLEGAL_PARAMETER;
 164                 return 0;
 165         }
 166
 167         /* Check that the extension matches */
 168         if (CBS_len(&reneg) != S3I(s)->previous_client_finished_len) {
 169                 SSLerror(s, SSL_R_RENEGOTIATION_MISMATCH);
 170                 *al = SSL_AD_HANDSHAKE_FAILURE;
 171                 return 0;
 172         }
 173
 174         if (!CBS_mem_equal(&reneg, S3I(s)->previous_client_finished,
 175             S3I(s)->previous_client_finished_len)) {
 176                 SSLerror(s, SSL_R_RENEGOTIATION_MISMATCH);
 177                 *al = SSL_AD_HANDSHAKE_FAILURE;
 178                 return 0;
 179         }
 180
 181         S3I(s)->send_connection_binding = 1;
 182
 183         return 1;
 184 }
 185
 186 /* Add the server's renegotiation binding */
 187 int
 188 ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
 189     int maxlen)
 190 {
 191         if (p) {
 192                 if ((S3I(s)->previous_client_finished_len +
 193                     S3I(s)->previous_server_finished_len + 1) > maxlen) {
 194                         SSLerror(s, SSL_R_RENEGOTIATE_EXT_TOO_LONG);
 195                         return 0;
 196                 }
 197
 198                 /* Length byte */
 199                 *p = S3I(s)->previous_client_finished_len +
 200                     S3I(s)->previous_server_finished_len;
 201                 p++;
 202
 203                 memcpy(p, S3I(s)->previous_client_finished,
 204                     S3I(s)->previous_client_finished_len);
 205                 p += S3I(s)->previous_client_finished_len;
 206
 207                 memcpy(p, S3I(s)->previous_server_finished,
 208                     S3I(s)->previous_server_finished_len);
 209
 210         }
 211
 212         *len = S3I(s)->previous_client_finished_len +
 213             S3I(s)->previous_server_finished_len + 1;
 214
 215         return 1;
 216 }
 217
 218 /* Parse the server's renegotiation binding and abort if it's not
 219    right */
 220 int
 221 ssl_parse_serverhello_renegotiate_ext(SSL *s, const unsigned char *d, int len, int *al)
 222 {
 223         CBS cbs, reneg, previous_client, previous_server;
 224         int expected_len = S3I(s)->previous_client_finished_len +
 225             S3I(s)->previous_server_finished_len;
 226
 227         /* Check for logic errors */
 228         OPENSSL_assert(!expected_len || S3I(s)->previous_client_finished_len);
 229         OPENSSL_assert(!expected_len || S3I(s)->previous_server_finished_len);
 230
 231         if (len < 0) {
 232                 SSLerror(s, SSL_R_RENEGOTIATION_ENCODING_ERR);
 233                 *al = SSL_AD_ILLEGAL_PARAMETER;
 234                 return 0;
 235         }
 236
 237         CBS_init(&cbs, d, len);
 238
 239         if (!CBS_get_u8_length_prefixed(&cbs, &reneg) ||
 240             /* Consistency check */
 241             CBS_len(&cbs) != 0) {
 242                 SSLerror(s, SSL_R_RENEGOTIATION_ENCODING_ERR);
 243                 *al = SSL_AD_ILLEGAL_PARAMETER;
 244                 return 0;
 245         }
 246
 247         /* Check that the extension matches */
 248         if (CBS_len(&reneg) != expected_len ||
 249             !CBS_get_bytes(&reneg, &previous_client,
 250             S3I(s)->previous_client_finished_len) ||
 251             !CBS_get_bytes(&reneg, &previous_server,
 252             S3I(s)->previous_server_finished_len) ||
 253             CBS_len(&reneg) != 0) {
 254                 SSLerror(s, SSL_R_RENEGOTIATION_MISMATCH);
 255                 *al = SSL_AD_HANDSHAKE_FAILURE;
 256                 return 0;
 257         }
 258
 259         if (!CBS_mem_equal(&previous_client, S3I(s)->previous_client_finished,
 260             CBS_len(&previous_client))) {
 261                 SSLerror(s, SSL_R_RENEGOTIATION_MISMATCH);
 262                 *al = SSL_AD_HANDSHAKE_FAILURE;
 263                 return 0;
 264         }
 265         if (!CBS_mem_equal(&previous_server, S3I(s)->previous_server_finished,
 266             CBS_len(&previous_server))) {
 267                 SSLerror(s, SSL_R_RENEGOTIATION_MISMATCH);
 268                 *al = SSL_AD_ILLEGAL_PARAMETER;
 269                 return 0;
 270         }
 271
 272         S3I(s)->send_connection_binding = 1;
 273
 274         return 1;
 275 }