1 /* ssl/t1_reneg.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh (at) 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 { 121 if((s->s3->previous_client_finished_len+1) > maxlen) 122 { 123 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATE_EXT_TOO_LONG); 124 return 0; 125 } 126 127 /* Length byte */ 128 *p = s->s3->previous_client_finished_len; 129 p++; 130 131 memcpy(p, s->s3->previous_client_finished, 132 s->s3->previous_client_finished_len); 133 #ifdef OPENSSL_RI_DEBUG 134 fprintf(stderr, "%s RI extension sent by client\n", 135 s->s3->previous_client_finished_len ? "Non-empty" : "Empty"); 136 #endif 137 } 138 139 *len=s->s3->previous_client_finished_len + 1; 140 141 142 return 1; 143 } 144 145 /* Parse the client's renegotiation binding and abort if it's not 146 right */ 147 int ssl_parse_clienthello_renegotiate_ext(SSL *s, unsigned char *d, int len, 148 int *al) 149 { 150 int ilen; 151 152 /* Parse the length byte */ 153 if(len < 1) 154 { 155 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATION_ENCODING_ERR); 156 *al=SSL_AD_ILLEGAL_PARAMETER; 157 return 0; 158 } 159 ilen = *d; 160 d++; 161 162 /* Consistency check */ 163 if((ilen+1) != len) 164 { 165 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATION_ENCODING_ERR); 166 *al=SSL_AD_ILLEGAL_PARAMETER; 167 return 0; 168 } 169 170 /* Check that the extension matches */ 171 if(ilen != s->s3->previous_client_finished_len) 172 { 173 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATION_MISMATCH); 174 *al=SSL_AD_HANDSHAKE_FAILURE; 175 return 0; 176 } 177 178 if(memcmp(d, s->s3->previous_client_finished, 179 s->s3->previous_client_finished_len)) 180 { 181 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATION_MISMATCH); 182 *al=SSL_AD_HANDSHAKE_FAILURE; 183 return 0; 184 } 185 #ifdef OPENSSL_RI_DEBUG 186 fprintf(stderr, "%s RI extension received by server\n", 187 ilen ? "Non-empty" : "Empty"); 188 #endif 189 190 s->s3->send_connection_binding=1; 191 192 return 1; 193 } 194 195 /* Add the server's renegotiation binding */ 196 int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len, 197 int maxlen) 198 { 199 if(p) 200 { 201 if((s->s3->previous_client_finished_len + 202 s->s3->previous_server_finished_len + 1) > maxlen) 203 { 204 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_RENEGOTIATE_EXT,SSL_R_RENEGOTIATE_EXT_TOO_LONG); 205 return 0; 206 } 207 208 /* Length byte */ 209 *p = s->s3->previous_client_finished_len + s->s3->previous_server_finished_len; 210 p++; 211 212 memcpy(p, s->s3->previous_client_finished, 213 s->s3->previous_client_finished_len); 214 p += s->s3->previous_client_finished_len; 215 216 memcpy(p, s->s3->previous_server_finished, 217 s->s3->previous_server_finished_len); 218 #ifdef OPENSSL_RI_DEBUG 219 fprintf(stderr, "%s RI extension sent by server\n", 220 s->s3->previous_client_finished_len ? "Non-empty" : "Empty"); 221 #endif 222 } 223 224 *len=s->s3->previous_client_finished_len 225 + s->s3->previous_server_finished_len + 1; 226 227 return 1; 228 } 229 230 /* Parse the server's renegotiation binding and abort if it's not 231 right */ 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 { 246 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,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 { 256 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,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 { 264 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,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 { 272 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,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 { 281 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_RENEGOTIATE_EXT,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
