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333f926d BL |
1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
2 | * All rights reserved. | |
3 | * | |
4 | * This package is an SSL implementation written | |
5 | * by Eric Young (eay@cryptsoft.com). | |
6 | * The implementation was written so as to conform with Netscapes SSL. | |
0f113f3e | 7 | * |
333f926d BL |
8 | * This library is free for commercial and non-commercial use as long as |
9 | * the following conditions are aheared to. The following conditions | |
10 | * apply to all code found in this distribution, be it the RC4, RSA, | |
11 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
12 | * included with this distribution is covered by the same copyright terms | |
13 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
0f113f3e | 14 | * |
333f926d BL |
15 | * Copyright remains Eric Young's, and as such any Copyright notices in |
16 | * the code are not to be removed. | |
17 | * If this package is used in a product, Eric Young should be given attribution | |
18 | * as the author of the parts of the library used. | |
19 | * This can be in the form of a textual message at program startup or | |
20 | * in documentation (online or textual) provided with the package. | |
0f113f3e | 21 | * |
333f926d BL |
22 | * Redistribution and use in source and binary forms, with or without |
23 | * modification, are permitted provided that the following conditions | |
24 | * are met: | |
25 | * 1. Redistributions of source code must retain the copyright | |
26 | * notice, this list of conditions and the following disclaimer. | |
27 | * 2. Redistributions in binary form must reproduce the above copyright | |
28 | * notice, this list of conditions and the following disclaimer in the | |
29 | * documentation and/or other materials provided with the distribution. | |
30 | * 3. All advertising materials mentioning features or use of this software | |
31 | * must display the following acknowledgement: | |
32 | * "This product includes cryptographic software written by | |
33 | * Eric Young (eay@cryptsoft.com)" | |
34 | * The word 'cryptographic' can be left out if the rouines from the library | |
35 | * being used are not cryptographic related :-). | |
0f113f3e | 36 | * 4. If you include any Windows specific code (or a derivative thereof) from |
333f926d BL |
37 | * the apps directory (application code) you must include an acknowledgement: |
38 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 39 | * |
333f926d BL |
40 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
41 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
42 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
43 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
44 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
45 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
46 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
48 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
49 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
50 | * SUCH DAMAGE. | |
0f113f3e | 51 | * |
333f926d BL |
52 | * The licence and distribution terms for any publically available version or |
53 | * derivative of this code cannot be changed. i.e. this code cannot simply be | |
54 | * copied and put under another distribution licence | |
55 | * [including the GNU Public Licence.] | |
56 | */ | |
57 | /* ==================================================================== | |
58 | * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. | |
59 | * | |
60 | * Redistribution and use in source and binary forms, with or without | |
61 | * modification, are permitted provided that the following conditions | |
62 | * are met: | |
63 | * | |
64 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 65 | * notice, this list of conditions and the following disclaimer. |
333f926d BL |
66 | * |
67 | * 2. Redistributions in binary form must reproduce the above copyright | |
68 | * notice, this list of conditions and the following disclaimer in | |
69 | * the documentation and/or other materials provided with the | |
70 | * distribution. | |
71 | * | |
72 | * 3. All advertising materials mentioning features or use of this | |
73 | * software must display the following acknowledgment: | |
74 | * "This product includes software developed by the OpenSSL Project | |
75 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
76 | * | |
77 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
78 | * endorse or promote products derived from this software without | |
79 | * prior written permission. For written permission, please contact | |
80 | * openssl-core@openssl.org. | |
81 | * | |
82 | * 5. Products derived from this software may not be called "OpenSSL" | |
83 | * nor may "OpenSSL" appear in their names without prior written | |
84 | * permission of the OpenSSL Project. | |
85 | * | |
86 | * 6. Redistributions of any form whatsoever must retain the following | |
87 | * acknowledgment: | |
88 | * "This product includes software developed by the OpenSSL Project | |
89 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
90 | * | |
91 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
92 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
93 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
94 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
95 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
96 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
97 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
98 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
99 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
100 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
101 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
102 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
103 | * ==================================================================== | |
104 | * | |
105 | * This product includes cryptographic software written by Eric Young | |
106 | * (eay@cryptsoft.com). This product includes software written by Tim | |
107 | * Hudson (tjh@cryptsoft.com). | |
108 | * | |
109 | */ | |
110 | /* | |
0f113f3e MC |
111 | * DTLS code by Eric Rescorla <ekr@rtfm.com> |
112 | * | |
113 | * Copyright (C) 2006, Network Resonance, Inc. Copyright (C) 2011, RTFM, Inc. | |
114 | */ | |
333f926d BL |
115 | |
116 | #include <stdio.h> | |
117 | #include <openssl/objects.h> | |
118 | #include "ssl_locl.h" | |
333f926d | 119 | |
32b07f5a | 120 | #ifndef OPENSSL_NO_SRTP |
333f926d | 121 | |
0f113f3e | 122 | static SRTP_PROTECTION_PROFILE srtp_known_profiles[] = { |
333f926d | 123 | { |
0f113f3e MC |
124 | "SRTP_AES128_CM_SHA1_80", |
125 | SRTP_AES128_CM_SHA1_80, | |
126 | }, | |
333f926d | 127 | { |
0f113f3e MC |
128 | "SRTP_AES128_CM_SHA1_32", |
129 | SRTP_AES128_CM_SHA1_32, | |
130 | }, | |
43e5faa2 DS |
131 | { |
132 | "SRTP_AEAD_AES_128_GCM", | |
133 | SRTP_AEAD_AES_128_GCM | |
134 | }, | |
135 | { | |
136 | "SRTP_AEAD_AES_256_GCM", | |
137 | SRTP_AEAD_AES_256_GCM | |
138 | }, | |
333f926d | 139 | {0} |
0f113f3e | 140 | }; |
333f926d BL |
141 | |
142 | static int find_profile_by_name(char *profile_name, | |
0f113f3e MC |
143 | SRTP_PROTECTION_PROFILE **pptr, unsigned len) |
144 | { | |
145 | SRTP_PROTECTION_PROFILE *p; | |
146 | ||
147 | p = srtp_known_profiles; | |
148 | while (p->name) { | |
86885c28 RS |
149 | if ((len == strlen(p->name)) |
150 | && strncmp(p->name, profile_name, len) == 0) { | |
0f113f3e MC |
151 | *pptr = p; |
152 | return 0; | |
153 | } | |
154 | ||
155 | p++; | |
156 | } | |
157 | ||
158 | return 1; | |
159 | } | |
160 | ||
161 | static int ssl_ctx_make_profiles(const char *profiles_string, | |
162 | STACK_OF(SRTP_PROTECTION_PROFILE) **out) | |
163 | { | |
164 | STACK_OF(SRTP_PROTECTION_PROFILE) *profiles; | |
165 | ||
166 | char *col; | |
167 | char *ptr = (char *)profiles_string; | |
0f113f3e MC |
168 | SRTP_PROTECTION_PROFILE *p; |
169 | ||
75ebbd9a | 170 | if ((profiles = sk_SRTP_PROTECTION_PROFILE_new_null()) == NULL) { |
0f113f3e MC |
171 | SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, |
172 | SSL_R_SRTP_COULD_NOT_ALLOCATE_PROFILES); | |
173 | return 1; | |
174 | } | |
175 | ||
176 | do { | |
177 | col = strchr(ptr, ':'); | |
178 | ||
179 | if (!find_profile_by_name(ptr, &p, | |
180 | col ? col - ptr : (int)strlen(ptr))) { | |
181 | if (sk_SRTP_PROTECTION_PROFILE_find(profiles, p) >= 0) { | |
182 | SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, | |
183 | SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); | |
184 | sk_SRTP_PROTECTION_PROFILE_free(profiles); | |
185 | return 1; | |
186 | } | |
187 | ||
188 | sk_SRTP_PROTECTION_PROFILE_push(profiles, p); | |
189 | } else { | |
190 | SSLerr(SSL_F_SSL_CTX_MAKE_PROFILES, | |
191 | SSL_R_SRTP_UNKNOWN_PROTECTION_PROFILE); | |
192 | sk_SRTP_PROTECTION_PROFILE_free(profiles); | |
193 | return 1; | |
194 | } | |
195 | ||
196 | if (col) | |
197 | ptr = col + 1; | |
198 | } while (col); | |
199 | ||
200 | *out = profiles; | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | int SSL_CTX_set_tlsext_use_srtp(SSL_CTX *ctx, const char *profiles) | |
206 | { | |
207 | return ssl_ctx_make_profiles(profiles, &ctx->srtp_profiles); | |
208 | } | |
209 | ||
210 | int SSL_set_tlsext_use_srtp(SSL *s, const char *profiles) | |
211 | { | |
212 | return ssl_ctx_make_profiles(profiles, &s->srtp_profiles); | |
213 | } | |
333f926d BL |
214 | |
215 | STACK_OF(SRTP_PROTECTION_PROFILE) *SSL_get_srtp_profiles(SSL *s) | |
0f113f3e MC |
216 | { |
217 | if (s != NULL) { | |
218 | if (s->srtp_profiles != NULL) { | |
219 | return s->srtp_profiles; | |
220 | } else if ((s->ctx != NULL) && (s->ctx->srtp_profiles != NULL)) { | |
221 | return s->ctx->srtp_profiles; | |
222 | } | |
223 | } | |
224 | ||
225 | return NULL; | |
226 | } | |
333f926d BL |
227 | |
228 | SRTP_PROTECTION_PROFILE *SSL_get_selected_srtp_profile(SSL *s) | |
0f113f3e MC |
229 | { |
230 | return s->srtp_profile; | |
231 | } | |
232 | ||
233 | /* | |
234 | * Note: this function returns 0 length if there are no profiles specified | |
235 | */ | |
236 | int ssl_add_clienthello_use_srtp_ext(SSL *s, unsigned char *p, int *len, | |
237 | int maxlen) | |
238 | { | |
239 | int ct = 0; | |
240 | int i; | |
241 | STACK_OF(SRTP_PROTECTION_PROFILE) *clnt = 0; | |
242 | SRTP_PROTECTION_PROFILE *prof; | |
243 | ||
244 | clnt = SSL_get_srtp_profiles(s); | |
245 | ct = sk_SRTP_PROTECTION_PROFILE_num(clnt); /* -1 if clnt == 0 */ | |
246 | ||
247 | if (p) { | |
248 | if (ct == 0) { | |
249 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT, | |
250 | SSL_R_EMPTY_SRTP_PROTECTION_PROFILE_LIST); | |
251 | return 1; | |
252 | } | |
253 | ||
254 | if ((2 + ct * 2 + 1) > maxlen) { | |
255 | SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_USE_SRTP_EXT, | |
256 | SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); | |
257 | return 1; | |
258 | } | |
259 | ||
260 | /* Add the length */ | |
261 | s2n(ct * 2, p); | |
262 | for (i = 0; i < ct; i++) { | |
263 | prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i); | |
264 | s2n(prof->id, p); | |
265 | } | |
266 | ||
267 | /* Add an empty use_mki value */ | |
268 | *p++ = 0; | |
269 | } | |
270 | ||
271 | *len = 2 + ct * 2 + 1; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
9ceb2426 | 276 | int ssl_parse_clienthello_use_srtp_ext(SSL *s, PACKET *pkt, int *al) |
0f113f3e MC |
277 | { |
278 | SRTP_PROTECTION_PROFILE *sprof; | |
279 | STACK_OF(SRTP_PROTECTION_PROFILE) *srvr; | |
9ceb2426 | 280 | unsigned int ct, mki_len, id; |
0f113f3e | 281 | int i, srtp_pref; |
9ceb2426 | 282 | PACKET subpkt; |
0f113f3e | 283 | |
9ceb2426 MC |
284 | /* Pull off the length of the cipher suite list and check it is even */ |
285 | if (!PACKET_get_net_2(pkt, &ct) | |
286 | || (ct & 1) != 0 | |
287 | || !PACKET_get_sub_packet(pkt, &subpkt, ct)) { | |
0f113f3e MC |
288 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, |
289 | SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); | |
290 | *al = SSL_AD_DECODE_ERROR; | |
291 | return 1; | |
292 | } | |
293 | ||
294 | srvr = SSL_get_srtp_profiles(s); | |
295 | s->srtp_profile = NULL; | |
296 | /* Search all profiles for a match initially */ | |
297 | srtp_pref = sk_SRTP_PROTECTION_PROFILE_num(srvr); | |
298 | ||
9ceb2426 MC |
299 | while (PACKET_remaining(&subpkt)) { |
300 | if (!PACKET_get_net_2(&subpkt, &id)) { | |
301 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, | |
302 | SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); | |
303 | *al = SSL_AD_DECODE_ERROR; | |
304 | return 1; | |
305 | } | |
333f926d | 306 | |
0f113f3e MC |
307 | /* |
308 | * Only look for match in profiles of higher preference than | |
309 | * current match. | |
310 | * If no profiles have been have been configured then this | |
311 | * does nothing. | |
312 | */ | |
313 | for (i = 0; i < srtp_pref; i++) { | |
314 | sprof = sk_SRTP_PROTECTION_PROFILE_value(srvr, i); | |
315 | if (sprof->id == id) { | |
316 | s->srtp_profile = sprof; | |
317 | srtp_pref = i; | |
318 | break; | |
319 | } | |
320 | } | |
321 | } | |
322 | ||
323 | /* | |
324 | * Now extract the MKI value as a sanity check, but discard it for now | |
325 | */ | |
9ceb2426 MC |
326 | if (!PACKET_get_1(pkt, &mki_len)) { |
327 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, | |
328 | SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); | |
329 | *al = SSL_AD_DECODE_ERROR; | |
330 | return 1; | |
331 | } | |
0f113f3e | 332 | |
9ceb2426 MC |
333 | if (!PACKET_forward(pkt, mki_len) |
334 | || PACKET_remaining(pkt)) { | |
0f113f3e MC |
335 | SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_USE_SRTP_EXT, |
336 | SSL_R_BAD_SRTP_MKI_VALUE); | |
337 | *al = SSL_AD_DECODE_ERROR; | |
338 | return 1; | |
339 | } | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
344 | int ssl_add_serverhello_use_srtp_ext(SSL *s, unsigned char *p, int *len, | |
345 | int maxlen) | |
346 | { | |
347 | if (p) { | |
348 | if (maxlen < 5) { | |
349 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT, | |
350 | SSL_R_SRTP_PROTECTION_PROFILE_LIST_TOO_LONG); | |
351 | return 1; | |
352 | } | |
353 | ||
354 | if (s->srtp_profile == 0) { | |
355 | SSLerr(SSL_F_SSL_ADD_SERVERHELLO_USE_SRTP_EXT, | |
356 | SSL_R_USE_SRTP_NOT_NEGOTIATED); | |
357 | return 1; | |
358 | } | |
359 | s2n(2, p); | |
360 | s2n(s->srtp_profile->id, p); | |
361 | *p++ = 0; | |
362 | } | |
363 | *len = 5; | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
50932c4a | 368 | int ssl_parse_serverhello_use_srtp_ext(SSL *s, PACKET *pkt, int *al) |
0f113f3e | 369 | { |
50932c4a | 370 | unsigned int id, ct, mki; |
0f113f3e | 371 | int i; |
0f113f3e MC |
372 | |
373 | STACK_OF(SRTP_PROTECTION_PROFILE) *clnt; | |
374 | SRTP_PROTECTION_PROFILE *prof; | |
375 | ||
50932c4a MC |
376 | if (!PACKET_get_net_2(pkt, &ct) |
377 | || ct != 2 | |
378 | || !PACKET_get_net_2(pkt, &id) | |
379 | || !PACKET_get_1(pkt, &mki) | |
380 | || PACKET_remaining(pkt) != 0) { | |
0f113f3e MC |
381 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, |
382 | SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); | |
383 | *al = SSL_AD_DECODE_ERROR; | |
384 | return 1; | |
385 | } | |
386 | ||
50932c4a MC |
387 | if (mki != 0) { |
388 | /* Must be no MKI, since we never offer one */ | |
0f113f3e MC |
389 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, |
390 | SSL_R_BAD_SRTP_MKI_VALUE); | |
391 | *al = SSL_AD_ILLEGAL_PARAMETER; | |
392 | return 1; | |
393 | } | |
394 | ||
395 | clnt = SSL_get_srtp_profiles(s); | |
396 | ||
397 | /* Throw an error if the server gave us an unsolicited extension */ | |
398 | if (clnt == NULL) { | |
399 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, | |
400 | SSL_R_NO_SRTP_PROFILES); | |
401 | *al = SSL_AD_DECODE_ERROR; | |
402 | return 1; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Check to see if the server gave us something we support (and | |
407 | * presumably offered) | |
408 | */ | |
409 | for (i = 0; i < sk_SRTP_PROTECTION_PROFILE_num(clnt); i++) { | |
410 | prof = sk_SRTP_PROTECTION_PROFILE_value(clnt, i); | |
411 | ||
412 | if (prof->id == id) { | |
413 | s->srtp_profile = prof; | |
414 | *al = 0; | |
415 | return 0; | |
416 | } | |
417 | } | |
418 | ||
419 | SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_USE_SRTP_EXT, | |
420 | SSL_R_BAD_SRTP_PROTECTION_PROFILE_LIST); | |
421 | *al = SSL_AD_DECODE_ERROR; | |
422 | return 1; | |
423 | } | |
333f926d BL |
424 | |
425 | #endif |