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 */ 116int 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 */ 146int 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 */ 195int 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 */ 232int 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} 293