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" 120 121 #ifndef OPENSSL_NO_SRTP 122 123 # include "srtp.h" 124 125 static SRTP_PROTECTION_PROFILE srtp_known_profiles[] = { 126 { 127 "SRTP_AES128_CM_SHA1_80", 128 SRTP_AES128_CM_SHA1_80, 129 }, 130 { 131 "SRTP_AES128_CM_SHA1_32", 132 SRTP_AES128_CM_SHA1_32, 133 }, 134 # if 0 135 { 136 "SRTP_NULL_SHA1_80", 137 SRTP_NULL_SHA1_80, 138 }, 139 { 140 "SRTP_NULL_SHA1_32", 141 SRTP_NULL_SHA1_32, 142 }, 143 # endif 144 {0} 145 }; 146 147 static int find_profile_by_name(char *profile_name, 148 SRTP_PROTECTION_PROFILE **pptr, unsigned len) 149 { 150 SRTP_PROTECTION_PROFILE *p; 151 152 p = srtp_known_profiles; 153 while (p->name) { 154 if ((len == strlen(p->name)) && !strncmp(p->name, profile_name, len)) { 155 *pptr = p; 156 return 0; 157 } 158 159 p++; 160 } 161 162 return 1; 163 } 164 165 static int ssl_ctx_make_profiles(const char *profiles_string, 166 STACK_OF(SRTP_PROTECTION_PROFILE) **out) 167 { 168 STACK_OF(SRTP_PROTECTION_PROFILE) *profiles; 169 170 char *col; 171 char *ptr = (char *)profiles_string; 172 173 SRTP_PROTECTION_PROFILE *p; 174 175 if (!(profiles = sk_SRTP_PROTECTION_PROFILE_new_null())) { 176 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, 177 SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES); 178 return 1; 179 } 180 181 do { 182 col = strchr(ptr, ':'); 183 184 if (!find_profile_by_name(ptr, &p, 185 col ? col - ptr : (int)strlen(ptr))) { 186 if (sk_SRTP_PROTECTION_PROFILE_find(profiles, p) >= 0) { 187 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, 188 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 189 sk_SRTP_PROTECTION_PROFILE_free(profiles); 190 return 1; 191 } 192 193 sk_SRTP_PROTECTION_PROFILE_push(profiles, p); 194 } else { 195 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, 196 SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE); 197 sk_SRTP_PROTECTION_PROFILE_free(profiles); 198 return 1; 199 } 200 201 if (col) 202 ptr = col + 1; 203 } while (col); 204 205 *out = profiles; 206 207 return 0; 208 } 209 210 int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles) 211 { 212 return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles); 213 } 214 215 int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles) 216 { 217 return ssl_ctx_make_profiles(profiles, &s->srtp_profiles); 218 } 219 220 STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s) 221 { 222 if (s != NULL) { 223 if (s->srtp_profiles != NULL) { 224 return s->srtp_profiles; 225 } else if ((s->ctx != NULL) && (s->ctx->srtp_profiles != NULL)) { 226 return s->ctx->srtp_profiles; 227 } 228 } 229 230 return NULL; 231 } 232 233 SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s) 234 { 235 return s->srtp_profile; 236 } 237 238 /* 239 * Note: this function returns 0 length if there are no profiles specified 240 */ 241 int ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len, 242 int maxlen) 243 { 244 int ct = 0; 245 int i; 246 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0; 247 SRTP_PROTECTION_PROFILE *prof; 248 249 clnt = SSL_get_srtp_profiles(s); 250 ct = sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */ 251 252 if (p) { 253 if (ct == 0) { 254 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT, 255 SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST); 256 return 1; 257 } 258 259 if ((2 + ct * 2 + 1) > maxlen) { 260 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT, 261 SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); 262 return 1; 263 } 264 265 /* Add the length */ 266 s2n(ct * 2, p); 267 for (i = 0; i < ct; i++) { 268 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i); 269 s2n(prof->id, p); 270 } 271 272 /* Add an empty use_mki value */ 273 *p++ = 0; 274 } 275 276 *len = 2 + ct * 2 + 1; 277 278 return 0; 279 } 280 281 int ssl_parse_clienthello_use_srtp_ext(SSL *s, unsigned char *d, int len, 282 int *al) 283 { 284 SRTP_PROTECTION_PROFILE *sprof; 285 STACK_OF(SRTP_PROTECTION_PROFILE) *srvr; 286 int ct; 287 int mki_len; 288 int i, srtp_pref; 289 unsigned int id; 290 291 /* Length value + the MKI length */ 292 if (len < 3) { 293 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, 294 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 295 *al = SSL_AD_DECODE_ERROR; 296 return 1; 297 } 298 299 /* Pull off the length of the cipher suite list */ 300 n2s(d, ct); 301 len -= 2; 302 303 /* Check that it is even */ 304 if (ct % 2) { 305 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, 306 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 307 *al = SSL_AD_DECODE_ERROR; 308 return 1; 309 } 310 311 /* Check that lengths are consistent */ 312 if (len < (ct + 1)) { 313 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, 314 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 315 *al = SSL_AD_DECODE_ERROR; 316 return 1; 317 } 318 319 srvr = SSL_get_srtp_profiles(s); 320 s->srtp_profile = NULL; 321 /* Search all profiles for a match initially */ 322 srtp_pref = sk_SRTP_PROTECTION_PROFILE_num(srvr); 323 324 while (ct) { 325 n2s(d, id); 326 ct -= 2; 327 len -= 2; 328 329 /* 330 * Only look for match in profiles of higher preference than 331 * current match. 332 * If no profiles have been have been configured then this 333 * does nothing. 334 */ 335 for (i = 0; i < srtp_pref; i++) { 336 sprof = sk_SRTP_PROTECTION_PROFILE_value(srvr, i); 337 if (sprof->id == id) { 338 s->srtp_profile = sprof; 339 srtp_pref = i; 340 break; 341 } 342 } 343 } 344 345 /* 346 * Now extract the MKI value as a sanity check, but discard it for now 347 */ 348 mki_len = *d; 349 d++; 350 len--; 351 352 if (mki_len != len) { 353 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, 354 SSL_R_BAD_SRTP_MKI_VALUE); 355 *al = SSL_AD_DECODE_ERROR; 356 return 1; 357 } 358 359 return 0; 360 } 361 362 int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len, 363 int maxlen) 364 { 365 if (p) { 366 if (maxlen < 5) { 367 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT, 368 SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); 369 return 1; 370 } 371 372 if (s->srtp_profile == 0) { 373 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT, 374 SSL_R_USE_SRTP_NOT_NEGOTIATED); 375 return 1; 376 } 377 s2n(2, p); 378 s2n(s->srtp_profile->id, p); 379 *p++ = 0; 380 } 381 *len = 5; 382 383 return 0; 384 } 385 386 int ssl_parse_serverhello_use_srtp_ext(SSL *s, unsigned char *d, int len, 387 int *al) 388 { 389 unsigned id; 390 int i; 391 int ct; 392 393 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt; 394 SRTP_PROTECTION_PROFILE *prof; 395 396 if (len != 5) { 397 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, 398 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 399 *al = SSL_AD_DECODE_ERROR; 400 return 1; 401 } 402 403 n2s(d, ct); 404 if (ct != 2) { 405 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, 406 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 407 *al = SSL_AD_DECODE_ERROR; 408 return 1; 409 } 410 411 n2s(d, id); 412 if (*d) { /* Must be no MKI, since we never offer one */ 413 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, 414 SSL_R_BAD_SRTP_MKI_VALUE); 415 *al = SSL_AD_ILLEGAL_PARAMETER; 416 return 1; 417 } 418 419 clnt = SSL_get_srtp_profiles(s); 420 421 /* Throw an error if the server gave us an unsolicited extension */ 422 if (clnt == NULL) { 423 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, 424 SSL_R_NO_SRTP_PROFILES); 425 *al = SSL_AD_DECODE_ERROR; 426 return 1; 427 } 428 429 /* 430 * Check to see if the server gave us something we support (and 431 * presumably offered) 432 */ 433 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) { 434 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i); 435 436 if (prof->id == id) { 437 s->srtp_profile = prof; 438 *al = 0; 439 return 0; 440 } 441 } 442 443 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, 444 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 445 *al = SSL_AD_DECODE_ERROR; 446 return 1; 447 } 448 449 #endif 450