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
127 static 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
150 static 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
171 static 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
190 static 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
228 int 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
233 int SSL_set_tlsext_use_srtp(SSL *s,const char *profiles)
234 {
235 return ssl_ctx_make_profiles(profiles,&s->srtp_profiles);
236 }
237
238
239 STACK_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
257 SRTP_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 */
264 int 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
306 int 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
400 done:
401 if(clnt) sk_SRTP_PROTECTION_PROFILE_free(clnt);
402
403 return ret;
404 }
405
406 int 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
431 int 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