1/* ssl/t1_lib.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) 1998-2006 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 * DTLS code by Eric Rescorla <ekr@rtfm.com> 113 * 114 * Copyright (C) 2006, Network Resonance, Inc. Copyright (C) 2011, RTFM, Inc. 115 */ 116 117#include <stdio.h> 118#include <openssl/objects.h> 119#include "ssl_locl.h" 120#include "srtp.h" 121 122#ifndef OPENSSL_NO_SRTP 123 124static SRTP_PROTECTION_PROFILE srtp_known_profiles[] = { 125 { 126 "SRTP_AES128_CM_SHA1_80", 127 SRTP_AES128_CM_SHA1_80, 128 }, 129 { 130 "SRTP_AES128_CM_SHA1_32", 131 SRTP_AES128_CM_SHA1_32, 132 }, 133# if 0 134 { 135 "SRTP_NULL_SHA1_80", 136 SRTP_NULL_SHA1_80, 137 }, 138 { 139 "SRTP_NULL_SHA1_32", 140 SRTP_NULL_SHA1_32, 141 }, 142# endif 143 {0} 144}; 145 146static int find_profile_by_name(char *profile_name, 147 SRTP_PROTECTION_PROFILE **pptr, unsigned len) 148{ 149 SRTP_PROTECTION_PROFILE *p; 150 151 p = srtp_known_profiles; 152 while (p->name) { 153 if ((len == strlen(p->name)) && !strncmp(p->name, profile_name, len)) { 154 *pptr = p; 155 return 0; 156 } 157 158 p++; 159 } 160 161 return 1; 162} 163 164static int ssl_ctx_make_profiles(const char *profiles_string, 165 STACK_OF(SRTP_PROTECTION_PROFILE) **out) 166{ 167 STACK_OF(SRTP_PROTECTION_PROFILE) *profiles; 168 169 char *col; 170 char *ptr = (char *)profiles_string; 171 172 SRTP_PROTECTION_PROFILE *p; 173 174 if (!(profiles = sk_SRTP_PROTECTION_PROFILE_new_null())) { 175 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, 176 SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES); 177 return 1; 178 } 179 180 do { 181 col = strchr(ptr, ':'); 182 183 if (!find_profile_by_name(ptr, &p, 184 col ? col - ptr : (int)strlen(ptr))) { 185 if (sk_SRTP_PROTECTION_PROFILE_find(profiles, p) >= 0) { 186 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, 187 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 188 sk_SRTP_PROTECTION_PROFILE_free(profiles); 189 return 1; 190 } 191 192 sk_SRTP_PROTECTION_PROFILE_push(profiles, p); 193 } else { 194 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, 195 SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE); 196 sk_SRTP_PROTECTION_PROFILE_free(profiles); 197 return 1; 198 } 199 200 if (col) 201 ptr = col + 1; 202 } while (col); 203 204 *out = profiles; 205 206 return 0; 207} 208 209int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles) 210{ 211 return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles); 212} 213 214int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles) 215{ 216 return ssl_ctx_make_profiles(profiles, &s->srtp_profiles); 217} 218 219STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s) 220{ 221 if (s != NULL) { 222 if (s->srtp_profiles != NULL) { 223 return s->srtp_profiles; 224 } else if ((s->ctx != NULL) && (s->ctx->srtp_profiles != NULL)) { 225 return s->ctx->srtp_profiles; 226 } 227 } 228 229 return NULL; 230} 231 232SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s) 233{ 234 return s->srtp_profile; 235} 236 237/* 238 * Note: this function returns 0 length if there are no profiles specified 239 */ 240int ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len, 241 int maxlen) 242{ 243 int ct = 0; 244 int i; 245 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0; 246 SRTP_PROTECTION_PROFILE *prof; 247 248 clnt = SSL_get_srtp_profiles(s); 249 ct = sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */ 250 251 if (p) { 252 if (ct == 0) { 253 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT, 254 SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST); 255 return 1; 256 } 257 258 if ((2 + ct * 2 + 1) > maxlen) { 259 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT, 260 SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); 261 return 1; 262 } 263 264 /* Add the length */ 265 s2n(ct * 2, p); 266 for (i = 0; i < ct; i++) { 267 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i); 268 s2n(prof->id, p); 269 } 270 271 /* Add an empty use_mki value */ 272 *p++ = 0; 273 } 274 275 *len = 2 + ct * 2 + 1; 276 277 return 0; 278} 279 280int ssl_parse_clienthello_use_srtp_ext(SSL *s, unsigned char *d, int len, 281 int *al) 282{ 283 SRTP_PROTECTION_PROFILE *sprof; 284 STACK_OF(SRTP_PROTECTION_PROFILE) *srvr; 285 int ct; 286 int mki_len; 287 int i, srtp_pref; 288 unsigned int id; 289 290 /* Length value + the MKI length */ 291 if (len < 3) { 292 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, 293 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 294 *al = SSL_AD_DECODE_ERROR; 295 return 1; 296 } 297 298 /* Pull off the length of the cipher suite list */ 299 n2s(d, ct); 300 len -= 2; 301 302 /* Check that it is even */ 303 if (ct % 2) { 304 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, 305 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 306 *al = SSL_AD_DECODE_ERROR; 307 return 1; 308 } 309 310 /* Check that lengths are consistent */ 311 if (len < (ct + 1)) { 312 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, 313 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 314 *al = SSL_AD_DECODE_ERROR; 315 return 1; 316 } 317 318 srvr = SSL_get_srtp_profiles(s); 319 s->srtp_profile = NULL; 320 /* Search all profiles for a match initially */ 321 srtp_pref = sk_SRTP_PROTECTION_PROFILE_num(srvr); 322 323 while (ct) { 324 n2s(d, id); 325 ct -= 2; 326 len -= 2; 327 328 /* 329 * Only look for match in profiles of higher preference than 330 * current match. 331 * If no profiles have been have been configured then this 332 * does nothing. 333 */ 334 for (i = 0; i < srtp_pref; i++) { 335 sprof = sk_SRTP_PROTECTION_PROFILE_value(srvr, i); 336 if (sprof->id == id) { 337 s->srtp_profile = sprof; 338 srtp_pref = i; 339 break; 340 } 341 } 342 } 343 344 /* 345 * Now extract the MKI value as a sanity check, but discard it for now 346 */ 347 mki_len = *d; 348 d++; 349 len--; 350 351 if (mki_len != len) { 352 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, 353 SSL_R_BAD_SRTP_MKI_VALUE); 354 *al = SSL_AD_DECODE_ERROR; 355 return 1; 356 } 357 358 return 0; 359} 360 361int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len, 362 int maxlen) 363{ 364 if (p) { 365 if (maxlen < 5) { 366 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT, 367 SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); 368 return 1; 369 } 370 371 if (s->srtp_profile == 0) { 372 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT, 373 SSL_R_USE_SRTP_NOT_NEGOTIATED); 374 return 1; 375 } 376 s2n(2, p); 377 s2n(s->srtp_profile->id, p); 378 *p++ = 0; 379 } 380 *len = 5; 381 382 return 0; 383} 384 385int ssl_parse_serverhello_use_srtp_ext(SSL *s, unsigned char *d, int len, 386 int *al) 387{ 388 unsigned id; 389 int i; 390 int ct; 391 392 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt; 393 SRTP_PROTECTION_PROFILE *prof; 394 395 if (len != 5) { 396 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, 397 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 398 *al = SSL_AD_DECODE_ERROR; 399 return 1; 400 } 401 402 n2s(d, ct); 403 if (ct != 2) { 404 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, 405 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 406 *al = SSL_AD_DECODE_ERROR; 407 return 1; 408 } 409 410 n2s(d, id); 411 if (*d) { /* Must be no MKI, since we never offer one */ 412 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, 413 SSL_R_BAD_SRTP_MKI_VALUE); 414 *al = SSL_AD_ILLEGAL_PARAMETER; 415 return 1; 416 } 417 418 clnt = SSL_get_srtp_profiles(s); 419 420 /* Throw an error if the server gave us an unsolicited extension */ 421 if (clnt == NULL) { 422 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, 423 SSL_R_NO_SRTP_PROFILES); 424 *al = SSL_AD_DECODE_ERROR; 425 return 1; 426 } 427 428 /* 429 * Check to see if the server gave us something we support (and 430 * presumably offered) 431 */ 432 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) { 433 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i); 434 435 if (prof->id == id) { 436 s->srtp_profile = prof; 437 *al = 0; 438 return 0; 439 } 440 } 441 442 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, 443 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 444 *al = SSL_AD_DECODE_ERROR; 445 return 1; 446} 447 448#endif 449