ssl/t1_reneg.c

   1 /* ssl/t1_reneg.c */
   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 #include <stdio.h>
 112 #include <openssl/objects.h>
 113 #include "ssl_locl.h"
 114
 115 /* Add the client's renegotiation binding */
 116 int ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
 117                                         int maxlen)
 118 {
 119     if (p) {
 120         if ((s->s3->previous_client_finished_len + 1) > maxlen) {
 121             SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_RENEGOTIATE_EXT,
 122                    SSL_R_RENEGOTIATE_EXT_TOO_LONG);
 123             return 0;
 124         }
 125
 126         /* Length byte */
 127         *p = s->s3->previous_client_finished_len;
 128         p++;
 129
 130         memcpy(p, s->s3->previous_client_finished,
 131                s->s3->previous_client_finished_len);
 132 #ifdef OPENSSL_RI_DEBUG
 133         fprintf(stderr, "%s RI extension sent by client\n",
 134                 s->s3->previous_client_finished_len ? "Non-empty" : "Empty");
 135 #endif
 136     }
 137
 138     *len = s->s3->previous_client_finished_len + 1;
 139
 140     return 1;
 141 }
 142
 143 /*
 144  * Parse the client's renegotiation binding and abort if it's not right
 145  */
 146 int ssl_parse_clienthello_renegotiate_ext(SSL *s, unsigned char *d, int len,
 147                                           int *al)
 148 {
 149     int ilen;
 150
 151     /* Parse the length byte */
 152     if (len < 1) {
 153         SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
 154                SSL_R_RENEGOTIATION_ENCODING_ERR);
 155         *al = SSL_AD_ILLEGAL_PARAMETER;
 156         return 0;
 157     }
 158     ilen = *d;
 159     d++;
 160
 161     /* Consistency check */
 162     if ((ilen + 1) != len) {
 163         SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
 164                SSL_R_RENEGOTIATION_ENCODING_ERR);
 165         *al = SSL_AD_ILLEGAL_PARAMETER;
 166         return 0;
 167     }
 168
 169     /* Check that the extension matches */
 170     if (ilen != s->s3->previous_client_finished_len) {
 171         SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
 172                SSL_R_RENEGOTIATION_MISMATCH);
 173         *al = SSL_AD_HANDSHAKE_FAILURE;
 174         return 0;
 175     }
 176
 177     if (memcmp(d, s->s3->previous_client_finished,
 178                s->s3->previous_client_finished_len)) {
 179         SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,
 180                SSL_R_RENEGOTIATION_MISMATCH);
 181         *al = SSL_AD_HANDSHAKE_FAILURE;
 182         return 0;
 183     }
 184 #ifdef OPENSSL_RI_DEBUG
 185     fprintf(stderr, "%s RI extension received by server\n",
 186             ilen ? "Non-empty" : "Empty");
 187 #endif
 188
 189     s->s3->send_connection_binding = 1;
 190
 191     return 1;
 192 }
 193
 194 /* Add the server's renegotiation binding */
 195 int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len,
 196                                         int maxlen)
 197 {
 198     if (p) {
 199         if ((s->s3->previous_client_finished_len +
 200              s->s3->previous_server_finished_len + 1) > maxlen) {
 201             SSLerr(SSL_F_SSL_ADD_SERVERHELLO_RENEGOTIATE_EXT,
 202                    SSL_R_RENEGOTIATE_EXT_TOO_LONG);
 203             return 0;
 204         }
 205
 206         /* Length byte */
 207         *p = s->s3->previous_client_finished_len +
 208             s->s3->previous_server_finished_len;
 209         p++;
 210
 211         memcpy(p, s->s3->previous_client_finished,
 212                s->s3->previous_client_finished_len);
 213         p += s->s3->previous_client_finished_len;
 214
 215         memcpy(p, s->s3->previous_server_finished,
 216                s->s3->previous_server_finished_len);
 217 #ifdef OPENSSL_RI_DEBUG
 218         fprintf(stderr, "%s RI extension sent by server\n",
 219                 s->s3->previous_client_finished_len ? "Non-empty" : "Empty");
 220 #endif
 221     }
 222
 223     *len = s->s3->previous_client_finished_len
 224         + s->s3->previous_server_finished_len + 1;
 225
 226     return 1;
 227 }
 228
 229 /*
 230  * Parse the server's renegotiation binding and abort if it's not right
 231  */
 232 int ssl_parse_serverhello_renegotiate_ext(SSL *s, unsigned char *d, int len,
 233                                           int *al)
 234 {
 235     int expected_len = s->s3->previous_client_finished_len
 236         + s->s3->previous_server_finished_len;
 237     int ilen;
 238
 239     /* Check for logic errors */
 240     OPENSSL_assert(!expected_len || s->s3->previous_client_finished_len);
 241     OPENSSL_assert(!expected_len || s->s3->previous_server_finished_len);
 242
 243     /* Parse the length byte */
 244     if (len < 1) {
 245         SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
 246                SSL_R_RENEGOTIATION_ENCODING_ERR);
 247         *al = SSL_AD_ILLEGAL_PARAMETER;
 248         return 0;
 249     }
 250     ilen = *d;
 251     d++;
 252
 253     /* Consistency check */
 254     if (ilen + 1 != len) {
 255         SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
 256                SSL_R_RENEGOTIATION_ENCODING_ERR);
 257         *al = SSL_AD_ILLEGAL_PARAMETER;
 258         return 0;
 259     }
 260
 261     /* Check that the extension matches */
 262     if (ilen != expected_len) {
 263         SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
 264                SSL_R_RENEGOTIATION_MISMATCH);
 265         *al = SSL_AD_HANDSHAKE_FAILURE;
 266         return 0;
 267     }
 268
 269     if (memcmp(d, s->s3->previous_client_finished,
 270                s->s3->previous_client_finished_len)) {
 271         SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
 272                SSL_R_RENEGOTIATION_MISMATCH);
 273         *al = SSL_AD_HANDSHAKE_FAILURE;
 274         return 0;
 275     }
 276     d += s->s3->previous_client_finished_len;
 277
 278     if (memcmp(d, s->s3->previous_server_finished,
 279                s->s3->previous_server_finished_len)) {
 280         SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,
 281                SSL_R_RENEGOTIATION_MISMATCH);
 282         *al = SSL_AD_ILLEGAL_PARAMETER;
 283         return 0;
 284     }
 285 #ifdef OPENSSL_RI_DEBUG
 286     fprintf(stderr, "%s RI extension received by client\n",
 287             ilen ? "Non-empty" : "Empty");
 288 #endif
 289     s->s3->send_connection_binding = 1;
 290
 291     return 1;
 292 }