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 find_profile_by_num(unsigned profile_num, 172 SRTP_PROTECTION_PROFILE **pptr) 173 { 174 SRTP_PROTECTION_PROFILE *p; 175 176 p=srtp_known_profiles; 177 while(p->name) 178 { 179 if(p->id == profile_num) 180 { 181 *pptr=p; 182 return 0; 183 } 184 p++; 185 } 186 187 return 1; 188 } 189 190static int ssl_ctx_make_profiles(const char *profiles_string,STACK_OF(SRTP_PROTECTION_PROFILE) **out) 191 { 192 STACK_OF(SRTP_PROTECTION_PROFILE) *profiles; 193 194 char *col; 195 char *ptr=(char *)profiles_string; 196 197 SRTP_PROTECTION_PROFILE *p; 198 199 if(!(profiles=sk_SRTP_PROTECTION_PROFILE_new_null())) 200 { 201 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES); 202 return 1; 203 } 204 205 do 206 { 207 col=strchr(ptr,':'); 208 209 if(!find_profile_by_name(ptr,&p, 210 col ? col-ptr : (int)strlen(ptr))) 211 { 212 sk_SRTP_PROTECTION_PROFILE_push(profiles,p); 213 } 214 else 215 { 216 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE); 217 return 1; 218 } 219 220 if(col) ptr=col+1; 221 } while (col); 222 223 *out=profiles; 224 225 return 0; 226 } 227 228int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx,const char *profiles) 229 { 230 return ssl_ctx_make_profiles(profiles,&ctx->srtp_profiles); 231 } 232 233int SSL_set_tlsext_use_srtp(SSL *s,const char *profiles) 234 { 235 return ssl_ctx_make_profiles(profiles,&s->srtp_profiles); 236 } 237 238 239STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s) 240 { 241 if(s != NULL) 242 { 243 if(s->srtp_profiles != NULL) 244 { 245 return s->srtp_profiles; 246 } 247 else if((s->ctx != NULL) && 248 (s->ctx->srtp_profiles != NULL)) 249 { 250 return s->ctx->srtp_profiles; 251 } 252 } 253 254 return NULL; 255 } 256 257SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s) 258 { 259 return s->srtp_profile; 260 } 261 262/* Note: this function returns 0 length if there are no 263 profiles specified */ 264int ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len, int maxlen) 265 { 266 int ct=0; 267 int i; 268 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt=0; 269 SRTP_PROTECTION_PROFILE *prof; 270 271 clnt=SSL_get_srtp_profiles(s); 272 ct=sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */ 273 274 if(p) 275 { 276 if(ct==0) 277 { 278 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST); 279 return 1; 280 } 281 282 if((2 + ct*2 + 1) > maxlen) 283 { 284 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); 285 return 1; 286 } 287 288 /* Add the length */ 289 s2n(ct * 2, p); 290 for(i=0;i<ct;i++) 291 { 292 prof=sk_SRTP_PROTECTION_PROFILE_value(clnt,i); 293 s2n(prof->id,p); 294 } 295 296 /* Add an empty use_mki value */ 297 *p++ = 0; 298 } 299 300 *len=2 + ct*2 + 1; 301 302 return 0; 303 } 304 305 306int ssl_parse_clienthello_use_srtp_ext(SSL *s, unsigned char *d, int len,int *al) 307 { 308 SRTP_PROTECTION_PROFILE *cprof,*sprof; 309 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt=0,*srvr; 310 int ct; 311 int mki_len; 312 int i,j; 313 int id; 314 int ret; 315 316 /* Length value + the MKI length */ 317 if(len < 3) 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 /* Pull off the length of the cipher suite list */ 325 n2s(d, ct); 326 len -= 2; 327 328 /* Check that it is even */ 329 if(ct%2) 330 { 331 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 332 *al=SSL_AD_DECODE_ERROR; 333 return 1; 334 } 335 336 /* Check that lengths are consistent */ 337 if(len < (ct + 1)) 338 { 339 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 340 *al=SSL_AD_DECODE_ERROR; 341 return 1; 342 } 343 344 345 clnt=sk_SRTP_PROTECTION_PROFILE_new_null(); 346 347 while(ct) 348 { 349 n2s(d,id); 350 ct-=2; 351 len-=2; 352 353 if(!find_profile_by_num(id,&cprof)) 354 { 355 sk_SRTP_PROTECTION_PROFILE_push(clnt,cprof); 356 } 357 else 358 { 359 ; /* Ignore */ 360 } 361 } 362 363 /* Now extract the MKI value as a sanity check, but discard it for now */ 364 mki_len = *d; 365 d++; len--; 366 367 if (mki_len != len) 368 { 369 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_MKI_VALUE); 370 *al=SSL_AD_DECODE_ERROR; 371 return 1; 372 } 373 374 srvr=SSL_get_srtp_profiles(s); 375 376 /* Pick our most preferred profile. If no profiles have been 377 configured then the outer loop doesn't run 378 (sk_SRTP_PROTECTION_PROFILE_num() = -1) 379 and so we just return without doing anything */ 380 for(i=0;i<sk_SRTP_PROTECTION_PROFILE_num(srvr);i++) 381 { 382 sprof=sk_SRTP_PROTECTION_PROFILE_value(srvr,i); 383 384 for(j=0;j<sk_SRTP_PROTECTION_PROFILE_num(clnt);j++) 385 { 386 cprof=sk_SRTP_PROTECTION_PROFILE_value(clnt,j); 387 388 if(cprof->id==sprof->id) 389 { 390 s->srtp_profile=sprof; 391 *al=0; 392 ret=0; 393 goto done; 394 } 395 } 396 } 397 398 ret=0; 399 400done: 401 if(clnt) sk_SRTP_PROTECTION_PROFILE_free(clnt); 402 403 return ret; 404 } 405 406int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len, int maxlen) 407 { 408 if(p) 409 { 410 if(maxlen < 5) 411 { 412 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); 413 return 1; 414 } 415 416 if(s->srtp_profile==0) 417 { 418 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,SSL_R_USE_SRTP_NOT_NEGOTIATED); 419 return 1; 420 } 421 s2n(2, p); 422 s2n(s->srtp_profile->id,p); 423 *p++ = 0; 424 } 425 *len=5; 426 427 return 0; 428 } 429 430 431int ssl_parse_serverhello_use_srtp_ext(SSL *s, unsigned char *d, int len,int *al) 432 { 433 unsigned id; 434 int i; 435 int ct; 436 437 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt; 438 SRTP_PROTECTION_PROFILE *prof; 439 440 if(len!=5) 441 { 442 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 443 *al=SSL_AD_DECODE_ERROR; 444 return 1; 445 } 446 447 n2s(d, ct); 448 if(ct!=2) 449 { 450 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 451 *al=SSL_AD_DECODE_ERROR; 452 return 1; 453 } 454 455 n2s(d,id); 456 if (*d) /* Must be no MKI, since we never offer one */ 457 { 458 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_MKI_VALUE); 459 *al=SSL_AD_ILLEGAL_PARAMETER; 460 return 1; 461 } 462 463 clnt=SSL_get_srtp_profiles(s); 464 465 /* Throw an error if the server gave us an unsolicited extension */ 466 if (clnt == NULL) 467 { 468 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_NO_SRTP_PROFILES); 469 *al=SSL_AD_DECODE_ERROR; 470 return 1; 471 } 472 473 /* Check to see if the server gave us something we support 474 (and presumably offered) 475 */ 476 for(i=0;i<sk_SRTP_PROTECTION_PROFILE_num(clnt);i++) 477 { 478 prof=sk_SRTP_PROTECTION_PROFILE_value(clnt,i); 479 480 if(prof->id == id) 481 { 482 s->srtp_profile=prof; 483 *al=0; 484 return 0; 485 } 486 } 487 488 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 489 *al=SSL_AD_DECODE_ERROR; 490 return 1; 491 } 492 493 494#endif 495