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 #ifndef OPENSSL_NO_SRTP 119 120 #include <stdio.h> 121 #include <openssl/objects.h> 122 #include "ssl_locl.h" 123 #include "srtp.h" 124 125 126 static SRTP_PROTECTION_PROFILE srtp_known_profiles[]= 127 { 128 { 129 "SRTP_AES128_CM_SHA1_80", 130 SRTP_AES128_CM_SHA1_80, 131 }, 132 { 133 "SRTP_AES128_CM_SHA1_32", 134 SRTP_AES128_CM_SHA1_32, 135 }, 136 #if 0 137 { 138 "SRTP_NULL_SHA1_80", 139 SRTP_NULL_SHA1_80, 140 }, 141 { 142 "SRTP_NULL_SHA1_32", 143 SRTP_NULL_SHA1_32, 144 }, 145 #endif 146 {0} 147 }; 148 149 static int find_profile_by_name(char *profile_name, 150 SRTP_PROTECTION_PROFILE **pptr,unsigned len) 151 { 152 SRTP_PROTECTION_PROFILE *p; 153 154 p=srtp_known_profiles; 155 while(p->name) 156 { 157 if((len == strlen(p->name)) && !strncmp(p->name,profile_name, 158 len)) 159 { 160 *pptr=p; 161 return 0; 162 } 163 164 p++; 165 } 166 167 return 1; 168 } 169 170 static int find_profile_by_num(unsigned profile_num, 171 SRTP_PROTECTION_PROFILE **pptr) 172 { 173 SRTP_PROTECTION_PROFILE *p; 174 175 p=srtp_known_profiles; 176 while(p->name) 177 { 178 if(p->id == profile_num) 179 { 180 *pptr=p; 181 return 0; 182 } 183 p++; 184 } 185 186 return 1; 187 } 188 189 static int ssl_ctx_make_profiles(const char *profiles_string,STACK_OF(SRTP_PROTECTION_PROFILE) **out) 190 { 191 STACK_OF(SRTP_PROTECTION_PROFILE) *profiles; 192 193 char *col; 194 char *ptr=(char *)profiles_string; 195 196 SRTP_PROTECTION_PROFILE *p; 197 198 if(!(profiles=sk_SRTP_PROTECTION_PROFILE_new_null())) 199 { 200 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES); 201 return 1; 202 } 203 204 do 205 { 206 col=strchr(ptr,':'); 207 208 if(!find_profile_by_name(ptr,&p, 209 col ? col-ptr : (int)strlen(ptr))) 210 { 211 sk_SRTP_PROTECTION_PROFILE_push(profiles,p); 212 } 213 else 214 { 215 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE); 216 return 1; 217 } 218 219 if(col) ptr=col+1; 220 } while (col); 221 222 *out=profiles; 223 224 return 0; 225 } 226 227 int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx,const char *profiles) 228 { 229 return ssl_ctx_make_profiles(profiles,&ctx->srtp_profiles); 230 } 231 232 int SSL_set_tlsext_use_srtp(SSL *s,const char *profiles) 233 { 234 return ssl_ctx_make_profiles(profiles,&s->srtp_profiles); 235 } 236 237 238 STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s) 239 { 240 if(s != NULL) 241 { 242 if(s->srtp_profiles != NULL) 243 { 244 return s->srtp_profiles; 245 } 246 else if((s->ctx != NULL) && 247 (s->ctx->srtp_profiles != NULL)) 248 { 249 return s->ctx->srtp_profiles; 250 } 251 } 252 253 return NULL; 254 } 255 256 SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s) 257 { 258 return s->srtp_profile; 259 } 260 261 /* Note: this function returns 0 length if there are no 262 profiles specified */ 263 int ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len, int maxlen) 264 { 265 int ct=0; 266 int i; 267 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt=0; 268 SRTP_PROTECTION_PROFILE *prof; 269 270 clnt=SSL_get_srtp_profiles(s); 271 ct=sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */ 272 273 if(p) 274 { 275 if(ct==0) 276 { 277 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST); 278 return 1; 279 } 280 281 if((2 + ct*2 + 1) > maxlen) 282 { 283 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); 284 return 1; 285 } 286 287 /* Add the length */ 288 s2n(ct * 2, p); 289 for(i=0;i<ct;i++) 290 { 291 prof=sk_SRTP_PROTECTION_PROFILE_value(clnt,i); 292 s2n(prof->id,p); 293 } 294 295 /* Add an empty use_mki value */ 296 *p++ = 0; 297 } 298 299 *len=2 + ct*2 + 1; 300 301 return 0; 302 } 303 304 305 int ssl_parse_clienthello_use_srtp_ext(SSL *s, unsigned char *d, int len,int *al) 306 { 307 SRTP_PROTECTION_PROFILE *cprof,*sprof; 308 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt=0,*srvr; 309 int ct; 310 int mki_len; 311 int i,j; 312 int id; 313 int ret; 314 315 /* Length value + the MKI length */ 316 if(len < 3) 317 { 318 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 319 *al=SSL_AD_DECODE_ERROR; 320 return 1; 321 } 322 323 /* Pull off the length of the cipher suite list */ 324 n2s(d, ct); 325 len -= 2; 326 327 /* Check that it is even */ 328 if(ct%2) 329 { 330 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 331 *al=SSL_AD_DECODE_ERROR; 332 return 1; 333 } 334 335 /* Check that lengths are consistent */ 336 if(len < (ct + 1)) 337 { 338 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 339 *al=SSL_AD_DECODE_ERROR; 340 return 1; 341 } 342 343 344 clnt=sk_SRTP_PROTECTION_PROFILE_new_null(); 345 346 while(ct) 347 { 348 n2s(d,id); 349 ct-=2; 350 len-=2; 351 352 if(!find_profile_by_num(id,&cprof)) 353 { 354 sk_SRTP_PROTECTION_PROFILE_push(clnt,cprof); 355 } 356 else 357 { 358 ; /* Ignore */ 359 } 360 } 361 362 /* Now extract the MKI value as a sanity check, but discard it for now */ 363 mki_len = *d; 364 d++; len--; 365 366 if (mki_len != len) 367 { 368 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_MKI_VALUE); 369 *al=SSL_AD_DECODE_ERROR; 370 return 1; 371 } 372 373 srvr=SSL_get_srtp_profiles(s); 374 375 /* Pick our most preferred profile. If no profiles have been 376 configured then the outer loop doesn't run 377 (sk_SRTP_PROTECTION_PROFILE_num() = -1) 378 and so we just return without doing anything */ 379 for(i=0;i<sk_SRTP_PROTECTION_PROFILE_num(srvr);i++) 380 { 381 sprof=sk_SRTP_PROTECTION_PROFILE_value(srvr,i); 382 383 for(j=0;j<sk_SRTP_PROTECTION_PROFILE_num(clnt);j++) 384 { 385 cprof=sk_SRTP_PROTECTION_PROFILE_value(clnt,j); 386 387 if(cprof->id==sprof->id) 388 { 389 s->srtp_profile=sprof; 390 *al=0; 391 ret=0; 392 goto done; 393 } 394 } 395 } 396 397 ret=0; 398 399 done: 400 if(clnt) sk_SRTP_PROTECTION_PROFILE_free(clnt); 401 402 return ret; 403 } 404 405 int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len, int maxlen) 406 { 407 if(p) 408 { 409 if(maxlen < 5) 410 { 411 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); 412 return 1; 413 } 414 415 if(s->srtp_profile==0) 416 { 417 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,SSL_R_USE_SRTP_NOT_NEGOTIATED); 418 return 1; 419 } 420 s2n(2, p); 421 s2n(s->srtp_profile->id,p); 422 *p++ = 0; 423 } 424 *len=5; 425 426 return 0; 427 } 428 429 430 int ssl_parse_serverhello_use_srtp_ext(SSL *s, unsigned char *d, int len,int *al) 431 { 432 unsigned id; 433 int i; 434 int ct; 435 436 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt; 437 SRTP_PROTECTION_PROFILE *prof; 438 439 if(len!=5) 440 { 441 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 442 *al=SSL_AD_DECODE_ERROR; 443 return 1; 444 } 445 446 n2s(d, ct); 447 if(ct!=2) 448 { 449 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 450 *al=SSL_AD_DECODE_ERROR; 451 return 1; 452 } 453 454 n2s(d,id); 455 if (*d) /* Must be no MKI, since we never offer one */ 456 { 457 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_MKI_VALUE); 458 *al=SSL_AD_ILLEGAL_PARAMETER; 459 return 1; 460 } 461 462 clnt=SSL_get_srtp_profiles(s); 463 464 /* Throw an error if the server gave us an unsolicited extension */ 465 if (clnt == NULL) 466 { 467 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_NO_SRTP_PROFILES); 468 *al=SSL_AD_DECODE_ERROR; 469 return 1; 470 } 471 472 /* Check to see if the server gave us something we support 473 (and presumably offered) 474 */ 475 for(i=0;i<sk_SRTP_PROTECTION_PROFILE_num(clnt);i++) 476 { 477 prof=sk_SRTP_PROTECTION_PROFILE_value(clnt,i); 478 479 if(prof->id == id) 480 { 481 s->srtp_profile=prof; 482 *al=0; 483 return 0; 484 } 485 } 486 487 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); 488 *al=SSL_AD_DECODE_ERROR; 489 return 1; 490 } 491 492 493 #endif 494