1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay@cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay@cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] 56 */ 57/* ==================================================================== 58 * Copyright (c) 1998-2009 The OpenSSL Project. All rights reserved. 59 * 60 * Redistribution and use in source and binary forms, with or without 61 * modification, are permitted provided that the following conditions 62 * are met: 63 * 64 * 1. Redistributions of source code must retain the above copyright 65 * notice, this list of conditions and the following disclaimer. 66 * 67 * 2. Redistributions in binary form must reproduce the above copyright 68 * notice, this list of conditions and the following disclaimer in 69 * the documentation and/or other materials provided with the 70 * distribution. 71 * 72 * 3. All advertising materials mentioning features or use of this 73 * software must display the following acknowledgment: 74 * "This product includes software developed by the OpenSSL Project 75 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 76 * 77 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 78 * endorse or promote products derived from this software without 79 * prior written permission. For written permission, please contact 80 * openssl-core@openssl.org. 81 * 82 * 5. Products derived from this software may not be called "OpenSSL" 83 * nor may "OpenSSL" appear in their names without prior written 84 * permission of the OpenSSL Project. 85 * 86 * 6. Redistributions of any form whatsoever must retain the following 87 * acknowledgment: 88 * "This product includes software developed by the OpenSSL Project 89 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 90 * 91 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 92 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 93 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 94 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 95 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 96 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 97 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 98 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 99 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 100 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 101 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 102 * OF THE POSSIBILITY OF SUCH DAMAGE. 103 * ==================================================================== 104 * 105 * This product includes cryptographic software written by Eric Young 106 * (eay@cryptsoft.com). This product includes software written by Tim 107 * Hudson (tjh@cryptsoft.com). */ 108 109#include <stdio.h> 110#include <assert.h> 111 112#include <openssl/bytestring.h> 113#include <openssl/obj.h> 114#include <openssl/err.h> 115 116#include "ssl_locl.h" 117 118/* Add the client's renegotiation binding */ 119int ssl_add_clienthello_renegotiate_ext(SSL *s, unsigned char *p, int *len, 120 int maxlen) 121 { 122 if(p) 123 { 124 if((s->s3->previous_client_finished_len+1) > maxlen) 125 { 126 OPENSSL_PUT_ERROR(SSL, ssl_add_clienthello_renegotiate_ext, SSL_R_RENEGOTIATE_EXT_TOO_LONG); 127 return 0; 128 } 129 130 /* Length byte */ 131 *p = s->s3->previous_client_finished_len; 132 p++; 133 134 memcpy(p, s->s3->previous_client_finished, 135 s->s3->previous_client_finished_len); 136#ifdef OPENSSL_RI_DEBUG 137 fprintf(stderr, "%s RI extension sent by client\n", 138 s->s3->previous_client_finished_len ? "Non-empty" : "Empty"); 139#endif 140 } 141 142 *len=s->s3->previous_client_finished_len + 1; 143 144 145 return 1; 146 } 147 148/* Parse the client's renegotiation binding and abort if it's not 149 right */ 150int ssl_parse_clienthello_renegotiate_ext(SSL *s, CBS *cbs, int *out_alert) 151 { 152 CBS renegotiated_connection; 153 154 if (!CBS_get_u8_length_prefixed(cbs, &renegotiated_connection) || 155 CBS_len(cbs) != 0) 156 { 157 OPENSSL_PUT_ERROR(SSL, ssl_parse_clienthello_renegotiate_ext, SSL_R_RENEGOTIATION_ENCODING_ERR); 158 *out_alert = SSL_AD_DECODE_ERROR; 159 return 0; 160 } 161 162 /* Check that the extension matches */ 163 if (!CBS_mem_equal(&renegotiated_connection, 164 s->s3->previous_client_finished, 165 s->s3->previous_client_finished_len)) 166 { 167 OPENSSL_PUT_ERROR(SSL, ssl_parse_clienthello_renegotiate_ext, SSL_R_RENEGOTIATION_MISMATCH); 168 *out_alert = SSL_AD_HANDSHAKE_FAILURE; 169 return 0; 170 } 171 172 s->s3->send_connection_binding = 1; 173 174 return 1; 175 } 176 177/* Add the server's renegotiation binding */ 178int ssl_add_serverhello_renegotiate_ext(SSL *s, unsigned char *p, int *len, 179 int maxlen) 180 { 181 if(p) 182 { 183 if((s->s3->previous_client_finished_len + 184 s->s3->previous_server_finished_len + 1) > maxlen) 185 { 186 OPENSSL_PUT_ERROR(SSL, ssl_add_serverhello_renegotiate_ext, SSL_R_RENEGOTIATE_EXT_TOO_LONG); 187 return 0; 188 } 189 190 /* Length byte */ 191 *p = s->s3->previous_client_finished_len + s->s3->previous_server_finished_len; 192 p++; 193 194 memcpy(p, s->s3->previous_client_finished, 195 s->s3->previous_client_finished_len); 196 p += s->s3->previous_client_finished_len; 197 198 memcpy(p, s->s3->previous_server_finished, 199 s->s3->previous_server_finished_len); 200#ifdef OPENSSL_RI_DEBUG 201 fprintf(stderr, "%s RI extension sent by server\n", 202 s->s3->previous_client_finished_len ? "Non-empty" : "Empty"); 203#endif 204 } 205 206 *len=s->s3->previous_client_finished_len 207 + s->s3->previous_server_finished_len + 1; 208 209 return 1; 210 } 211 212/* Parse the server's renegotiation binding and abort if it's not 213 right */ 214int ssl_parse_serverhello_renegotiate_ext(SSL *s, CBS *cbs, int *out_alert) 215 { 216 int expected_len=s->s3->previous_client_finished_len 217 + s->s3->previous_server_finished_len; 218 CBS renegotiated_connection; 219 const uint8_t *d; 220 221 /* Check for logic errors */ 222 assert(!expected_len || s->s3->previous_client_finished_len); 223 assert(!expected_len || s->s3->previous_server_finished_len); 224 225 /* Parse out the extension contents. */ 226 if (!CBS_get_u8_length_prefixed(cbs, &renegotiated_connection) || 227 CBS_len(cbs) != 0) 228 { 229 OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_renegotiate_ext, SSL_R_RENEGOTIATION_ENCODING_ERR); 230 *out_alert = SSL_AD_ILLEGAL_PARAMETER; 231 return 0; 232 } 233 234 /* Check that the extension matches. */ 235 if(CBS_len(&renegotiated_connection) != expected_len) 236 { 237 OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_renegotiate_ext, SSL_R_RENEGOTIATION_MISMATCH); 238 *out_alert = SSL_AD_HANDSHAKE_FAILURE; 239 return 0; 240 } 241 242 d = CBS_data(&renegotiated_connection); 243 if(memcmp(d, s->s3->previous_client_finished, 244 s->s3->previous_client_finished_len)) 245 { 246 OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_renegotiate_ext, SSL_R_RENEGOTIATION_MISMATCH); 247 *out_alert = SSL_AD_HANDSHAKE_FAILURE; 248 return 0; 249 } 250 d += s->s3->previous_client_finished_len; 251 252 if(memcmp(d, s->s3->previous_server_finished, 253 s->s3->previous_server_finished_len)) 254 { 255 OPENSSL_PUT_ERROR(SSL, ssl_parse_serverhello_renegotiate_ext, SSL_R_RENEGOTIATION_MISMATCH); 256 *out_alert = SSL_AD_ILLEGAL_PARAMETER; 257 return 0; 258 } 259 s->s3->send_connection_binding = 1; 260 261 return 1; 262 } 263