crypto/libressl/ssl/t1_reneg.c

   1 /* $OpenBSD: t1_reneg.c,v 1.10 2015/06/20 04:04:36 doug 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 ((s->s3->previous_client_finished_len + 1) > maxlen) {
 126                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_RENEGOTIATE_EXT,
 127                             SSL_R_RENEGOTIATE_EXT_TOO_LONG);
 128                         return 0;
 129                 }
 130
 131                 /* Length byte */
 132                 *p = s->s3->previous_client_finished_len;
 133                 p++;
 134
 135                 memcpy(p, s->s3->previous_client_finished,
 136                     s->s3->previous_client_finished_len);
 137
 138         }
 139
 140         *len = s->s3->previous_client_finished_len + 1;
 141
 142         return 1;
 143 }
 144
 145 /* Parse the client's renegotiation binding and abort if it's not
 146    right */
 147 int
 148 ssl_parse_clienthello_renegotiate_ext(SSL *s, const unsigned char *d, int len,
 149     int *al)
 150 {
 151         CBS cbs, reneg;
 152
 153         if (len < 0) {
 154                 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
 155                     SSL_R_RENEGOTIATION_ENCODING_ERR);
 156                 *al = SSL_AD_ILLEGAL_PARAMETER;
 157                 return 0;
 158         }
 159
 160         CBS_init(&cbs, d, len);
 161         if (!CBS_get_u8_length_prefixed(&cbs, &reneg) ||
 162             /* Consistency check */
 163             CBS_len(&cbs) != 0) {
 164                 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
 165                     SSL_R_RENEGOTIATION_ENCODING_ERR);
 166                 *al = SSL_AD_ILLEGAL_PARAMETER;
 167                 return 0;
 168         }
 169
 170         /* Check that the extension matches */
 171         if (CBS_len(&reneg) != s->s3->previous_client_finished_len) {
 172                 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
 173                     SSL_R_RENEGOTIATION_MISMATCH);
 174                 *al = SSL_AD_HANDSHAKE_FAILURE;
 175                 return 0;
 176         }
 177
 178         if (!CBS_mem_equal(&reneg, s->s3->previous_client_finished,
 179             s->s3->previous_client_finished_len)) {
 180                 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
 181                     SSL_R_RENEGOTIATION_MISMATCH);
 182                 *al = SSL_AD_HANDSHAKE_FAILURE;
 183                 return 0;
 184         }
 185
 186         s->s3->send_connection_binding = 1;
 187
 188         return 1;
 189 }
 190
 191 /* Add the server's renegotiation binding */
 192 int
 193 ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
 194     int maxlen)
 195 {
 196         if (p) {
 197                 if ((s->s3->previous_client_finished_len +
 198                     s->s3->previous_server_finished_len + 1) > maxlen) {
 199                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_RENEGOTIATE_EXT,
 200                             SSL_R_RENEGOTIATE_EXT_TOO_LONG);
 201                         return 0;
 202                 }
 203
 204                 /* Length byte */
 205                 *p = s->s3->previous_client_finished_len +
 206                     s->s3->previous_server_finished_len;
 207                 p++;
 208
 209                 memcpy(p, s->s3->previous_client_finished,
 210                     s->s3->previous_client_finished_len);
 211                 p += s->s3->previous_client_finished_len;
 212
 213                 memcpy(p, s->s3->previous_server_finished,
 214                     s->s3->previous_server_finished_len);
 215
 216         }
 217
 218         *len = s->s3->previous_client_finished_len +
 219             s->s3->previous_server_finished_len + 1;
 220
 221         return 1;
 222 }
 223
 224 /* Parse the server's renegotiation binding and abort if it's not
 225    right */
 226 int
 227 ssl_parse_serverhello_renegotiate_ext(SSL *s, const unsigned char *d, int len, int *al)
 228 {
 229         CBS cbs, reneg, previous_client, previous_server;
 230         int expected_len = s->s3->previous_client_finished_len +
 231             s->s3->previous_server_finished_len;
 232
 233         /* Check for logic errors */
 234         OPENSSL_assert(!expected_len || s->s3->previous_client_finished_len);
 235         OPENSSL_assert(!expected_len || s->s3->previous_server_finished_len);
 236
 237         if (len < 0) {
 238                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
 239                     SSL_R_RENEGOTIATION_ENCODING_ERR);
 240                 *al = SSL_AD_ILLEGAL_PARAMETER;
 241                 return 0;
 242         }
 243
 244         CBS_init(&cbs, d, len);
 245
 246         if (!CBS_get_u8_length_prefixed(&cbs, &reneg) ||
 247             /* Consistency check */
 248             CBS_len(&cbs) != 0) {
 249                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
 250                     SSL_R_RENEGOTIATION_ENCODING_ERR);
 251                 *al = SSL_AD_ILLEGAL_PARAMETER;
 252                 return 0;
 253         }
 254
 255         /* Check that the extension matches */
 256         if (CBS_len(&reneg) != expected_len ||
 257             !CBS_get_bytes(&reneg, &previous_client,
 258             s->s3->previous_client_finished_len) ||
 259             !CBS_get_bytes(&reneg, &previous_server,
 260             s->s3->previous_server_finished_len) ||
 261             CBS_len(&reneg) != 0) {
 262                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
 263                     SSL_R_RENEGOTIATION_MISMATCH);
 264                 *al = SSL_AD_HANDSHAKE_FAILURE;
 265                 return 0;
 266         }
 267
 268         if (!CBS_mem_equal(&previous_client, s->s3->previous_client_finished,
 269             CBS_len(&previous_client))) {
 270                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
 271                     SSL_R_RENEGOTIATION_MISMATCH);
 272                 *al = SSL_AD_HANDSHAKE_FAILURE;
 273                 return 0;
 274         }
 275         if (!CBS_mem_equal(&previous_server, s->s3->previous_server_finished,
 276             CBS_len(&previous_server))) {
 277                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
 278                     SSL_R_RENEGOTIATION_MISMATCH);
 279                 *al = SSL_AD_ILLEGAL_PARAMETER;
 280                 return 0;
 281         }
 282
 283         s->s3->send_connection_binding = 1;
 284
 285         return 1;
 286 }