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. 115 Copyright (C) 2011, RTFM, Inc. 116*/ 117 118#include <stdio.h> 119#include <openssl/objects.h> 120#include "ssl_locl.h" 121 122#ifndef OPENSSL_NO_SRTP 123 124#include "srtp.h" 125 126 127static SRTP_PROTECTION_PROFILE srtp_known_profiles[]= 128 { 129 { 130 "SRTP_AES128_CM_SHA1_80", 131 SRTP_AES128_CM_SHA1_80, 132 }, 133 { 134 "SRTP_AES128_CM_SHA1_32", 135 SRTP_AES128_CM_SHA1_32, 136 }, 137#if 0 138 { 139 "SRTP_NULL_SHA1_80", 140 SRTP_NULL_SHA1_80, 141 }, 142 { 143 "SRTP_NULL_SHA1_32", 144 SRTP_NULL_SHA1_32, 145 }, 146#endif 147 {0} 148 }; 149 150static int find_profile_by_name(char *profile_name, 151 SRTP_PROTECTION_PROFILE **pptr,unsigned len) 152 { 153 SRTP_PROTECTION_PROFILE *p; 154 155 p=srtp_known_profiles; 156 while(p->name) 157 { 158 if((len == strlen(p->name)) && !strncmp(p->name,profile_name, 159 len)) 160 { 161 *pptr=p; 162 return 0; 163 } 164 165 p++; 166 } 167 168 return 1; 169 } 170 171static int ssl_ctx_make_profiles(const char *profiles_string,STACK_OF(SRTP_PROTECTION_PROFILE) **out) 172 { 173 STACK_OF(SRTP_PROTECTION_PROFILE) *profiles; 174 175 char *col; 176 char *ptr=(char *)profiles_string; 177 178 SRTP_PROTECTION_PROFILE *p; 179 180 if(!(profiles=sk_SRTP_PROTECTION_PROFILE_new_null())) 181 { 182 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES); 183 return 1; 184 } 185 186 do 187 { 188 col=strchr(ptr,':'); 189 190 if(!find_profile_by_name(ptr,&p, 191 col ? col-ptr : (int)strlen(ptr))) 192 { 193 if (sk_SRTP_PROTECTION_PROFILE_find(profiles,p) >= 0) 194 { 195 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 196 sk_SRTP_PROTECTION_PROFILE_free(profiles); 197 return 1; 198 } 199 200 sk_SRTP_PROTECTION_PROFILE_push(profiles,p); 201 } 202 else 203 { 204 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE); 205 sk_SRTP_PROTECTION_PROFILE_free(profiles); 206 return 1; 207 } 208 209 if(col) ptr=col+1; 210 } while (col); 211 212 *out=profiles; 213 214 return 0; 215 } 216 217int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx,const char *profiles) 218 { 219 return ssl_ctx_make_profiles(profiles,&ctx->srtp_profiles); 220 } 221 222int SSL_set_tlsext_use_srtp(SSL *s,const char *profiles) 223 { 224 return ssl_ctx_make_profiles(profiles,&s->srtp_profiles); 225 } 226 227 228STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s) 229 { 230 if(s != NULL) 231 { 232 if(s->srtp_profiles != NULL) 233 { 234 return s->srtp_profiles; 235 } 236 else if((s->ctx != NULL) && 237 (s->ctx->srtp_profiles != NULL)) 238 { 239 return s->ctx->srtp_profiles; 240 } 241 } 242 243 return NULL; 244 } 245 246SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s) 247 { 248 return s->srtp_profile; 249 } 250 251/* Note: this function returns 0 length if there are no 252 profiles specified */ 253int ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len, int maxlen) 254 { 255 int ct=0; 256 int i; 257 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt=0; 258 SRTP_PROTECTION_PROFILE *prof; 259 260 clnt=SSL_get_srtp_profiles(s); 261 ct=sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */ 262 263 if(p) 264 { 265 if(ct==0) 266 { 267 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST); 268 return 1; 269 } 270 271 if((2 + ct*2 + 1) > maxlen) 272 { 273 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); 274 return 1; 275 } 276 277 /* Add the length */ 278 s2n(ct * 2, p); 279 for(i=0;i<ct;i++) 280 { 281 prof=sk_SRTP_PROTECTION_PROFILE_value(clnt,i); 282 s2n(prof->id,p); 283 } 284 285 /* Add an empty use_mki value */ 286 *p++ = 0; 287 } 288 289 *len=2 + ct*2 + 1; 290 291 return 0; 292 } 293 294 295int ssl_parse_clienthello_use_srtp_ext(SSL *s, unsigned char *d, int len,int *al) 296 { 297 SRTP_PROTECTION_PROFILE *sprof; 298 STACK_OF(SRTP_PROTECTION_PROFILE) *srvr; 299 int ct; 300 int mki_len; 301 int i, srtp_pref; 302 unsigned int id; 303 304 /* Length value + the MKI length */ 305 if(len < 3) 306 { 307 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 308 *al=SSL_AD_DECODE_ERROR; 309 return 1; 310 } 311 312 /* Pull off the length of the cipher suite list */ 313 n2s(d, ct); 314 len -= 2; 315 316 /* Check that it is even */ 317 if(ct%2) 318 { 319 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 320 *al=SSL_AD_DECODE_ERROR; 321 return 1; 322 } 323 324 /* Check that lengths are consistent */ 325 if(len < (ct + 1)) 326 { 327 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 328 *al=SSL_AD_DECODE_ERROR; 329 return 1; 330 } 331 332 srvr=SSL_get_srtp_profiles(s); 333 s->srtp_profile = NULL; 334 /* Search all profiles for a match initially */ 335 srtp_pref = sk_SRTP_PROTECTION_PROFILE_num(srvr); 336 337 while(ct) 338 { 339 n2s(d,id); 340 ct-=2; 341 len-=2; 342 343 /* 344 * Only look for match in profiles of higher preference than 345 * current match. 346 * If no profiles have been have been configured then this 347 * does nothing. 348 */ 349 for (i = 0; i < srtp_pref; i++) 350 { 351 sprof = sk_SRTP_PROTECTION_PROFILE_value(srvr, i); 352 if (sprof->id == id) 353 { 354 s->srtp_profile = sprof; 355 srtp_pref = i; 356 break; 357 } 358 } 359 } 360 361 /* Now extract the MKI value as a sanity check, but discard it for now */ 362 mki_len = *d; 363 d++; len--; 364 365 if (mki_len != len) 366 { 367 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_MKI_VALUE); 368 *al=SSL_AD_DECODE_ERROR; 369 return 1; 370 } 371 372 return 0; 373 } 374 375int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len, int maxlen) 376 { 377 if(p) 378 { 379 if(maxlen < 5) 380 { 381 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); 382 return 1; 383 } 384 385 if(s->srtp_profile==0) 386 { 387 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,SSL_R_USE_SRTP_NOT_NEGOTIATED); 388 return 1; 389 } 390 s2n(2, p); 391 s2n(s->srtp_profile->id,p); 392 *p++ = 0; 393 } 394 *len=5; 395 396 return 0; 397 } 398 399 400int ssl_parse_serverhello_use_srtp_ext(SSL *s, unsigned char *d, int len,int *al) 401 { 402 unsigned id; 403 int i; 404 int ct; 405 406 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt; 407 SRTP_PROTECTION_PROFILE *prof; 408 409 if(len!=5) 410 { 411 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 412 *al=SSL_AD_DECODE_ERROR; 413 return 1; 414 } 415 416 n2s(d, ct); 417 if(ct!=2) 418 { 419 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 420 *al=SSL_AD_DECODE_ERROR; 421 return 1; 422 } 423 424 n2s(d,id); 425 if (*d) /* Must be no MKI, since we never offer one */ 426 { 427 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_MKI_VALUE); 428 *al=SSL_AD_ILLEGAL_PARAMETER; 429 return 1; 430 } 431 432 clnt=SSL_get_srtp_profiles(s); 433 434 /* Throw an error if the server gave us an unsolicited extension */ 435 if (clnt == NULL) 436 { 437 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_NO_SRTP_PROFILES); 438 *al=SSL_AD_DECODE_ERROR; 439 return 1; 440 } 441 442 /* Check to see if the server gave us something we support 443 (and presumably offered) 444 */ 445 for(i=0;i<sk_SRTP_PROTECTION_PROFILE_num(clnt);i++) 446 { 447 prof=sk_SRTP_PROTECTION_PROFILE_value(clnt,i); 448 449 if(prof->id == id) 450 { 451 s->srtp_profile=prof; 452 *al=0; 453 return 0; 454 } 455 } 456 457 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 458 *al=SSL_AD_DECODE_ERROR; 459 return 1; 460 } 461 462 463#endif 464