ssl/d1_srtp.c

   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 < 3)
 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
 421                 s2n(s->srtp_profile->id,p);
 422                 *p++ = 0;
 423                 }
 424         *len=3;
 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         STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
 435         SRTP_PROTECTION_PROFILE *prof;
 436
 437         if(len!=3)
 438                 {
 439                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
 440                 *al=SSL_AD_DECODE_ERROR;
 441                 return 1;
 442                 }
 443
 444         n2s(d,id);
 445         if (*d)  /* Must be no MKI, since we never offer one */
 446                 {
 447                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_MKI_VALUE);
 448                 *al=SSL_AD_ILLEGAL_PARAMETER;
 449                 return 1;
 450                 }
 451
 452         clnt=SSL_get_srtp_profiles(s);
 453
 454         /* Throw an error if the server gave us an unsolicited extension */
 455         if (clnt == NULL)
 456                 {
 457                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_NO_SRTP_PROFILES);
 458                 *al=SSL_AD_DECODE_ERROR;
 459                 return 1;
 460                 }
 461
 462         /* Check to see if the server gave us something we support
 463            (and presumably offered)
 464         */
 465         for(i=0;i<sk_SRTP_PROTECTION_PROFILE_num(clnt);i++)
 466                 {
 467                 prof=sk_SRTP_PROTECTION_PROFILE_value(clnt,i);
 468
 469                 if(prof->id == id)
 470                         {
 471                         s->srtp_profile=prof;
 472                         *al=0;
 473                         return 0;
 474                         }
 475                 }
 476
 477         SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
 478         *al=SSL_AD_DECODE_ERROR;
 479         return 1;
 480         }
 481
 482
 483 #endif