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diff --git a/src/lib/libssl/d1_srtp.c b/src/lib/libssl/d1_srtp.c
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1/* $OpenBSD: d1_srtp.c,v 1.11 2014/12/14 15:30:50 jsing Exp $ */
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
120#include <openssl/objects.h>
121
122#include "ssl_locl.h"
123
124#ifndef OPENSSL_NO_SRTP
125
126#include "srtp.h"
127
128
129static SRTP_PROTECTION_PROFILE srtp_known_profiles[] = {
130 {
131 "SRTP_AES128_CM_SHA1_80",
132 SRTP_AES128_CM_SHA1_80,
133 },
134 {
135 "SRTP_AES128_CM_SHA1_32",
136 SRTP_AES128_CM_SHA1_32,
137 },
138 {0}
139};
140
141static int
142find_profile_by_name(char *profile_name, SRTP_PROTECTION_PROFILE **pptr,
143 unsigned len)
144{
145 SRTP_PROTECTION_PROFILE *p;
146
147 p = srtp_known_profiles;
148 while (p->name) {
149 if ((len == strlen(p->name)) &&
150 !strncmp(p->name, profile_name, len)) {
151 *pptr = p;
152 return 0;
153 }
154
155 p++;
156 }
157
158 return 1;
159}
160
161static int
162find_profile_by_num(unsigned profile_num, SRTP_PROTECTION_PROFILE **pptr)
163{
164 SRTP_PROTECTION_PROFILE *p;
165
166 p = srtp_known_profiles;
167 while (p->name) {
168 if (p->id == profile_num) {
169 *pptr = p;
170 return 0;
171 }
172 p++;
173 }
174
175 return 1;
176}
177
178static int
179ssl_ctx_make_profiles(const char *profiles_string,
180 STACK_OF(SRTP_PROTECTION_PROFILE) **out)
181{
182 STACK_OF(SRTP_PROTECTION_PROFILE) *profiles;
183
184 char *col;
185 char *ptr = (char *)profiles_string;
186
187 SRTP_PROTECTION_PROFILE *p;
188
189 if (!(profiles = sk_SRTP_PROTECTION_PROFILE_new_null())) {
190 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
191 SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES);
192 return 1;
193 }
194
195 do {
196 col = strchr(ptr, ':');
197
198 if (!find_profile_by_name(ptr, &p,
199 col ? col - ptr : (int)strlen(ptr))) {
200 sk_SRTP_PROTECTION_PROFILE_push(profiles, p);
201 } else {
202 SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES,
203 SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE);
204 sk_SRTP_PROTECTION_PROFILE_free(profiles);
205 return 1;
206 }
207
208 if (col)
209 ptr = col + 1;
210 } while (col);
211
212 *out = profiles;
213
214 return 0;
215}
216
217int
218SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles)
219{
220 return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles);
221}
222
223int
224SSL_set_tlsext_use_srtp(SSL *s, const char *profiles)
225{
226 return ssl_ctx_make_profiles(profiles, &s->srtp_profiles);
227}
228
229
230STACK_OF(SRTP_PROTECTION_PROFILE) *
231SSL_get_srtp_profiles(SSL *s)
232{
233 if (s != NULL) {
234 if (s->srtp_profiles != NULL) {
235 return s->srtp_profiles;
236 } else if ((s->ctx != NULL) &&
237 (s->ctx->srtp_profiles != NULL)) {
238 return s->ctx->srtp_profiles;
239 }
240 }
241
242 return NULL;
243}
244
245SRTP_PROTECTION_PROFILE *
246SSL_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
254ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len, int maxlen)
255{
256 int ct = 0;
257 int i;
258 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0;
259 SRTP_PROTECTION_PROFILE *prof;
260
261 clnt = SSL_get_srtp_profiles(s);
262
263 ct = sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */
264
265 if (p) {
266 if (ct == 0) {
267 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,
268 SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST);
269 return 1;
270 }
271
272 if ((2 + ct * 2 + 1) > maxlen) {
273 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT,
274 SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG);
275 return 1;
276 }
277
278 /* Add the length */
279 s2n(ct * 2, p);
280 for (i = 0; i < ct; i++) {
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
296ssl_parse_clienthello_use_srtp_ext(SSL *s, unsigned char *d, int len, int *al)
297{
298 SRTP_PROTECTION_PROFILE *cprof, *sprof;
299 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0, *srvr;
300 int ct;
301 int mki_len;
302 int i, j;
303 int id;
304 int ret = 1;
305
306 /* Length value + the MKI length */
307 if (len < 3) {
308 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
309 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
310 *al = SSL_AD_DECODE_ERROR;
311 goto done;
312 }
313
314 /* Pull off the length of the cipher suite list */
315 n2s(d, ct);
316 len -= 2;
317
318 /* Check that it is even */
319 if (ct % 2) {
320 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
321 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
322 *al = SSL_AD_DECODE_ERROR;
323 goto done;
324 }
325
326 /* Check that lengths are consistent */
327 if (len < (ct + 1)) {
328 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
329 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
330 *al = SSL_AD_DECODE_ERROR;
331 goto done;
332 }
333
334
335 clnt = sk_SRTP_PROTECTION_PROFILE_new_null();
336
337 while (ct) {
338 n2s(d, id);
339 ct -= 2;
340 len -= 2;
341
342 if (!find_profile_by_num(id, &cprof)) {
343 sk_SRTP_PROTECTION_PROFILE_push(clnt, cprof);
344 } else {
345 ; /* Ignore */
346 }
347 }
348
349 /* Extract the MKI value as a sanity check, but discard it for now. */
350 mki_len = *d;
351 d++;
352 len--;
353
354 if (mki_len != len) {
355 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT,
356 SSL_R_BAD_SRTP_MKI_VALUE);
357 *al = SSL_AD_DECODE_ERROR;
358 goto done;
359 }
360
361 srvr = SSL_get_srtp_profiles(s);
362
363 /*
364 * Pick our most preferred profile. If no profiles have been
365 * configured then the outer loop doesn't run
366 * (sk_SRTP_PROTECTION_PROFILE_num() = -1)
367 * and so we just return without doing anything.
368 */
369 for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(srvr); i++) {
370 sprof = sk_SRTP_PROTECTION_PROFILE_value(srvr, i);
371
372 for (j = 0; j < sk_SRTP_PROTECTION_PROFILE_num(clnt); j++) {
373 cprof = sk_SRTP_PROTECTION_PROFILE_value(clnt, j);
374
375 if (cprof->id == sprof->id) {
376 s->srtp_profile = sprof;
377 *al = 0;
378 ret = 0;
379 goto done;
380 }
381 }
382 }
383
384 ret = 0;
385
386done:
387 if (clnt)
388 sk_SRTP_PROTECTION_PROFILE_free(clnt);
389
390 return ret;
391}
392
393int
394ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len, int maxlen)
395{
396 if (p) {
397 if (maxlen < 5) {
398 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,
399 SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG);
400 return 1;
401 }
402
403 if (s->srtp_profile == 0) {
404 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT,
405 SSL_R_USE_SRTP_NOT_NEGOTIATED);
406 return 1;
407 }
408 s2n(2, p);
409 s2n(s->srtp_profile->id, p);
410 *p++ = 0;
411 }
412 *len = 5;
413
414 return 0;
415}
416
417
418int
419ssl_parse_serverhello_use_srtp_ext(SSL *s, unsigned char *d, int len, int *al)
420{
421 STACK_OF(SRTP_PROTECTION_PROFILE) *clnt;
422 SRTP_PROTECTION_PROFILE *prof;
423 unsigned id;
424 int i;
425 int ct;
426
427 if (len != 5) {
428 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
429 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
430 *al = SSL_AD_DECODE_ERROR;
431 return 1;
432 }
433
434 n2s(d, ct);
435 if (ct != 2) {
436 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
437 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
438 *al = SSL_AD_DECODE_ERROR;
439 return 1;
440 }
441
442 n2s(d, id);
443 if (*d) {
444 /* Must be no MKI, since we never offer one. */
445 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
446 SSL_R_BAD_SRTP_MKI_VALUE);
447 *al = SSL_AD_ILLEGAL_PARAMETER;
448 return 1;
449 }
450
451 clnt = SSL_get_srtp_profiles(s);
452
453 /* Throw an error if the server gave us an unsolicited extension. */
454 if (clnt == NULL) {
455 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
456 SSL_R_NO_SRTP_PROFILES);
457 *al = SSL_AD_DECODE_ERROR;
458 return 1;
459 }
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 prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i);
467
468 if (prof->id == id) {
469 s->srtp_profile = prof;
470 *al = 0;
471 return 0;
472 }
473 }
474
475 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT,
476 SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST);
477 *al = SSL_AD_DECODE_ERROR;
478 return 1;
479}
480
481#endif
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