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) 1998-2007 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 #include <stdio.h>
113 #include <openssl/objects.h>
114 #include <openssl/evp.h>
115 #include <openssl/hmac.h>
116 #include <openssl/ocsp.h>
117 #include <openssl/rand.h>
118 #include "ssl_locl.h"
119
120 const char tls1_version_str[] = "TLSv1" OPENSSL_VERSION_PTEXT;
121
122 #ifndef OPENSSL_NO_TLSEXT
123 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
124 const unsigned char *sess_id, int sesslen,
125 SSL_SESSION **psess);
126 #endif
127
128 SSL3_ENC_METHOD TLSv1_enc_data = {
129 tls1_enc,
130 tls1_mac,
131 tls1_setup_key_block,
132 tls1_generate_master_secret,
133 tls1_change_cipher_state,
134 tls1_final_finish_mac,
135 TLS1_FINISH_MAC_LENGTH,
136 tls1_cert_verify_mac,
137 TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
138 TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
139 tls1_alert_code,
140 tls1_export_keying_material,
141 };
142
tls1_default_timeout(void)143 long tls1_default_timeout(void)
144 {
145 /*
146 * 2 hours, the 24 hours mentioned in the TLSv1 spec is way too long for
147 * http, the cache would over fill
148 */
149 return (60 * 60 * 2);
150 }
151
tls1_new(SSL * s)152 int tls1_new(SSL *s)
153 {
154 if (!ssl3_new(s))
155 return (0);
156 s->method->ssl_clear(s);
157 return (1);
158 }
159
tls1_free(SSL * s)160 void tls1_free(SSL *s)
161 {
162 #ifndef OPENSSL_NO_TLSEXT
163 if (s->tlsext_session_ticket) {
164 OPENSSL_free(s->tlsext_session_ticket);
165 }
166 #endif /* OPENSSL_NO_TLSEXT */
167 ssl3_free(s);
168 }
169
tls1_clear(SSL * s)170 void tls1_clear(SSL *s)
171 {
172 ssl3_clear(s);
173 s->version = s->method->version;
174 }
175
176 #ifndef OPENSSL_NO_EC
177
178 static int nid_list[] = {
179 NID_sect163k1, /* sect163k1 (1) */
180 NID_sect163r1, /* sect163r1 (2) */
181 NID_sect163r2, /* sect163r2 (3) */
182 NID_sect193r1, /* sect193r1 (4) */
183 NID_sect193r2, /* sect193r2 (5) */
184 NID_sect233k1, /* sect233k1 (6) */
185 NID_sect233r1, /* sect233r1 (7) */
186 NID_sect239k1, /* sect239k1 (8) */
187 NID_sect283k1, /* sect283k1 (9) */
188 NID_sect283r1, /* sect283r1 (10) */
189 NID_sect409k1, /* sect409k1 (11) */
190 NID_sect409r1, /* sect409r1 (12) */
191 NID_sect571k1, /* sect571k1 (13) */
192 NID_sect571r1, /* sect571r1 (14) */
193 NID_secp160k1, /* secp160k1 (15) */
194 NID_secp160r1, /* secp160r1 (16) */
195 NID_secp160r2, /* secp160r2 (17) */
196 NID_secp192k1, /* secp192k1 (18) */
197 NID_X9_62_prime192v1, /* secp192r1 (19) */
198 NID_secp224k1, /* secp224k1 (20) */
199 NID_secp224r1, /* secp224r1 (21) */
200 NID_secp256k1, /* secp256k1 (22) */
201 NID_X9_62_prime256v1, /* secp256r1 (23) */
202 NID_secp384r1, /* secp384r1 (24) */
203 NID_secp521r1 /* secp521r1 (25) */
204 };
205
206 static int pref_list[] = {
207 # ifndef OPENSSL_NO_EC2M
208 NID_sect571r1, /* sect571r1 (14) */
209 NID_sect571k1, /* sect571k1 (13) */
210 # endif
211 NID_secp521r1, /* secp521r1 (25) */
212 # ifndef OPENSSL_NO_EC2M
213 NID_sect409k1, /* sect409k1 (11) */
214 NID_sect409r1, /* sect409r1 (12) */
215 # endif
216 NID_secp384r1, /* secp384r1 (24) */
217 # ifndef OPENSSL_NO_EC2M
218 NID_sect283k1, /* sect283k1 (9) */
219 NID_sect283r1, /* sect283r1 (10) */
220 # endif
221 NID_secp256k1, /* secp256k1 (22) */
222 NID_X9_62_prime256v1, /* secp256r1 (23) */
223 # ifndef OPENSSL_NO_EC2M
224 NID_sect239k1, /* sect239k1 (8) */
225 NID_sect233k1, /* sect233k1 (6) */
226 NID_sect233r1, /* sect233r1 (7) */
227 # endif
228 NID_secp224k1, /* secp224k1 (20) */
229 NID_secp224r1, /* secp224r1 (21) */
230 # ifndef OPENSSL_NO_EC2M
231 NID_sect193r1, /* sect193r1 (4) */
232 NID_sect193r2, /* sect193r2 (5) */
233 # endif
234 NID_secp192k1, /* secp192k1 (18) */
235 NID_X9_62_prime192v1, /* secp192r1 (19) */
236 # ifndef OPENSSL_NO_EC2M
237 NID_sect163k1, /* sect163k1 (1) */
238 NID_sect163r1, /* sect163r1 (2) */
239 NID_sect163r2, /* sect163r2 (3) */
240 # endif
241 NID_secp160k1, /* secp160k1 (15) */
242 NID_secp160r1, /* secp160r1 (16) */
243 NID_secp160r2, /* secp160r2 (17) */
244 };
245
tls1_ec_curve_id2nid(int curve_id)246 int tls1_ec_curve_id2nid(int curve_id)
247 {
248 /* ECC curves from RFC 4492 */
249 if ((curve_id < 1) || ((unsigned int)curve_id >
250 sizeof(nid_list) / sizeof(nid_list[0])))
251 return 0;
252 return nid_list[curve_id - 1];
253 }
254
tls1_ec_nid2curve_id(int nid)255 int tls1_ec_nid2curve_id(int nid)
256 {
257 /* ECC curves from RFC 4492 */
258 switch (nid) {
259 case NID_sect163k1: /* sect163k1 (1) */
260 return 1;
261 case NID_sect163r1: /* sect163r1 (2) */
262 return 2;
263 case NID_sect163r2: /* sect163r2 (3) */
264 return 3;
265 case NID_sect193r1: /* sect193r1 (4) */
266 return 4;
267 case NID_sect193r2: /* sect193r2 (5) */
268 return 5;
269 case NID_sect233k1: /* sect233k1 (6) */
270 return 6;
271 case NID_sect233r1: /* sect233r1 (7) */
272 return 7;
273 case NID_sect239k1: /* sect239k1 (8) */
274 return 8;
275 case NID_sect283k1: /* sect283k1 (9) */
276 return 9;
277 case NID_sect283r1: /* sect283r1 (10) */
278 return 10;
279 case NID_sect409k1: /* sect409k1 (11) */
280 return 11;
281 case NID_sect409r1: /* sect409r1 (12) */
282 return 12;
283 case NID_sect571k1: /* sect571k1 (13) */
284 return 13;
285 case NID_sect571r1: /* sect571r1 (14) */
286 return 14;
287 case NID_secp160k1: /* secp160k1 (15) */
288 return 15;
289 case NID_secp160r1: /* secp160r1 (16) */
290 return 16;
291 case NID_secp160r2: /* secp160r2 (17) */
292 return 17;
293 case NID_secp192k1: /* secp192k1 (18) */
294 return 18;
295 case NID_X9_62_prime192v1: /* secp192r1 (19) */
296 return 19;
297 case NID_secp224k1: /* secp224k1 (20) */
298 return 20;
299 case NID_secp224r1: /* secp224r1 (21) */
300 return 21;
301 case NID_secp256k1: /* secp256k1 (22) */
302 return 22;
303 case NID_X9_62_prime256v1: /* secp256r1 (23) */
304 return 23;
305 case NID_secp384r1: /* secp384r1 (24) */
306 return 24;
307 case NID_secp521r1: /* secp521r1 (25) */
308 return 25;
309 default:
310 return 0;
311 }
312 }
313 #endif /* OPENSSL_NO_EC */
314
315 #ifndef OPENSSL_NO_TLSEXT
316
317 /*
318 * List of supported signature algorithms and hashes. Should make this
319 * customisable at some point, for now include everything we support.
320 */
321
322 # ifdef OPENSSL_NO_RSA
323 # define tlsext_sigalg_rsa(md) /* */
324 # else
325 # define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
326 # endif
327
328 # ifdef OPENSSL_NO_DSA
329 # define tlsext_sigalg_dsa(md) /* */
330 # else
331 # define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
332 # endif
333
334 # ifdef OPENSSL_NO_ECDSA
335 # define tlsext_sigalg_ecdsa(md)
336 /* */
337 # else
338 # define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
339 # endif
340
341 # define tlsext_sigalg(md) \
342 tlsext_sigalg_rsa(md) \
343 tlsext_sigalg_dsa(md) \
344 tlsext_sigalg_ecdsa(md)
345
346 static unsigned char tls12_sigalgs[] = {
347 # ifndef OPENSSL_NO_SHA512
348 tlsext_sigalg(TLSEXT_hash_sha512)
349 tlsext_sigalg(TLSEXT_hash_sha384)
350 # endif
351 # ifndef OPENSSL_NO_SHA256
352 tlsext_sigalg(TLSEXT_hash_sha256)
353 tlsext_sigalg(TLSEXT_hash_sha224)
354 # endif
355 # ifndef OPENSSL_NO_SHA
356 tlsext_sigalg(TLSEXT_hash_sha1)
357 # endif
358 };
359
tls12_get_req_sig_algs(SSL * s,unsigned char * p)360 int tls12_get_req_sig_algs(SSL *s, unsigned char *p)
361 {
362 size_t slen = sizeof(tls12_sigalgs);
363 if (p)
364 memcpy(p, tls12_sigalgs, slen);
365 return (int)slen;
366 }
367
ssl_add_clienthello_tlsext(SSL * s,unsigned char * buf,unsigned char * limit)368 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *buf,
369 unsigned char *limit)
370 {
371 int extdatalen = 0;
372 unsigned char *orig = buf;
373 unsigned char *ret = buf;
374
375 /* don't add extensions for SSLv3 unless doing secure renegotiation */
376 if (s->client_version == SSL3_VERSION && !s->s3->send_connection_binding)
377 return orig;
378
379 ret += 2;
380
381 if (ret >= limit)
382 return NULL; /* this really never occurs, but ... */
383
384 if (s->tlsext_hostname != NULL) {
385 /* Add TLS extension servername to the Client Hello message */
386 unsigned long size_str;
387 long lenmax;
388
389 /*-
390 * check for enough space.
391 * 4 for the servername type and entension length
392 * 2 for servernamelist length
393 * 1 for the hostname type
394 * 2 for hostname length
395 * + hostname length
396 */
397
398 if ((lenmax = limit - ret - 9) < 0
399 || (size_str =
400 strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
401 return NULL;
402
403 /* extension type and length */
404 s2n(TLSEXT_TYPE_server_name, ret);
405 s2n(size_str + 5, ret);
406
407 /* length of servername list */
408 s2n(size_str + 3, ret);
409
410 /* hostname type, length and hostname */
411 *(ret++) = (unsigned char)TLSEXT_NAMETYPE_host_name;
412 s2n(size_str, ret);
413 memcpy(ret, s->tlsext_hostname, size_str);
414 ret += size_str;
415 }
416
417 /* Add RI if renegotiating */
418 if (s->renegotiate) {
419 int el;
420
421 if (!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0)) {
422 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
423 return NULL;
424 }
425
426 if ((limit - ret - 4 - el) < 0)
427 return NULL;
428
429 s2n(TLSEXT_TYPE_renegotiate, ret);
430 s2n(el, ret);
431
432 if (!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el)) {
433 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
434 return NULL;
435 }
436
437 ret += el;
438 }
439 # ifndef OPENSSL_NO_SRP
440 /* Add SRP username if there is one */
441 if (s->srp_ctx.login != NULL) { /* Add TLS extension SRP username to the
442 * Client Hello message */
443
444 int login_len = strlen(s->srp_ctx.login);
445 if (login_len > 255 || login_len == 0) {
446 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
447 return NULL;
448 }
449
450 /*-
451 * check for enough space.
452 * 4 for the srp type type and entension length
453 * 1 for the srp user identity
454 * + srp user identity length
455 */
456 if ((limit - ret - 5 - login_len) < 0)
457 return NULL;
458
459 /* fill in the extension */
460 s2n(TLSEXT_TYPE_srp, ret);
461 s2n(login_len + 1, ret);
462 (*ret++) = (unsigned char)login_len;
463 memcpy(ret, s->srp_ctx.login, login_len);
464 ret += login_len;
465 }
466 # endif
467
468 # ifndef OPENSSL_NO_EC
469 if (s->tlsext_ecpointformatlist != NULL) {
470 /*
471 * Add TLS extension ECPointFormats to the ClientHello message
472 */
473 long lenmax;
474
475 if ((lenmax = limit - ret - 5) < 0)
476 return NULL;
477 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax)
478 return NULL;
479 if (s->tlsext_ecpointformatlist_length > 255) {
480 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
481 return NULL;
482 }
483
484 s2n(TLSEXT_TYPE_ec_point_formats, ret);
485 s2n(s->tlsext_ecpointformatlist_length + 1, ret);
486 *(ret++) = (unsigned char)s->tlsext_ecpointformatlist_length;
487 memcpy(ret, s->tlsext_ecpointformatlist,
488 s->tlsext_ecpointformatlist_length);
489 ret += s->tlsext_ecpointformatlist_length;
490 }
491 if (s->tlsext_ellipticcurvelist != NULL) {
492 /*
493 * Add TLS extension EllipticCurves to the ClientHello message
494 */
495 long lenmax;
496
497 if ((lenmax = limit - ret - 6) < 0)
498 return NULL;
499 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax)
500 return NULL;
501 if (s->tlsext_ellipticcurvelist_length > 65532) {
502 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
503 return NULL;
504 }
505
506 s2n(TLSEXT_TYPE_elliptic_curves, ret);
507 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
508
509 s2n(s->tlsext_ellipticcurvelist_length, ret);
510 memcpy(ret, s->tlsext_ellipticcurvelist,
511 s->tlsext_ellipticcurvelist_length);
512 ret += s->tlsext_ellipticcurvelist_length;
513 }
514 # endif /* OPENSSL_NO_EC */
515
516 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET)) {
517 int ticklen;
518 if (!s->new_session && s->session && s->session->tlsext_tick)
519 ticklen = s->session->tlsext_ticklen;
520 else if (s->session && s->tlsext_session_ticket &&
521 s->tlsext_session_ticket->data) {
522 ticklen = s->tlsext_session_ticket->length;
523 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
524 if (!s->session->tlsext_tick)
525 return NULL;
526 memcpy(s->session->tlsext_tick,
527 s->tlsext_session_ticket->data, ticklen);
528 s->session->tlsext_ticklen = ticklen;
529 } else
530 ticklen = 0;
531 if (ticklen == 0 && s->tlsext_session_ticket &&
532 s->tlsext_session_ticket->data == NULL)
533 goto skip_ext;
534 /*
535 * Check for enough room 2 for extension type, 2 for len rest for
536 * ticket
537 */
538 if ((long)(limit - ret - 4 - ticklen) < 0)
539 return NULL;
540 s2n(TLSEXT_TYPE_session_ticket, ret);
541 s2n(ticklen, ret);
542 if (ticklen) {
543 memcpy(ret, s->session->tlsext_tick, ticklen);
544 ret += ticklen;
545 }
546 }
547 skip_ext:
548
549 if (TLS1_get_client_version(s) >= TLS1_2_VERSION) {
550 if ((size_t)(limit - ret) < sizeof(tls12_sigalgs) + 6)
551 return NULL;
552 s2n(TLSEXT_TYPE_signature_algorithms, ret);
553 s2n(sizeof(tls12_sigalgs) + 2, ret);
554 s2n(sizeof(tls12_sigalgs), ret);
555 memcpy(ret, tls12_sigalgs, sizeof(tls12_sigalgs));
556 ret += sizeof(tls12_sigalgs);
557 }
558 # ifdef TLSEXT_TYPE_opaque_prf_input
559 if (s->s3->client_opaque_prf_input != NULL && s->version != DTLS1_VERSION) {
560 size_t col = s->s3->client_opaque_prf_input_len;
561
562 if ((long)(limit - ret - 6 - col < 0))
563 return NULL;
564 if (col > 0xFFFD) /* can't happen */
565 return NULL;
566
567 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
568 s2n(col + 2, ret);
569 s2n(col, ret);
570 memcpy(ret, s->s3->client_opaque_prf_input, col);
571 ret += col;
572 }
573 # endif
574
575 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
576 s->version != DTLS1_VERSION) {
577 int i;
578 long extlen, idlen, itmp;
579 OCSP_RESPID *id;
580
581 idlen = 0;
582 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) {
583 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
584 itmp = i2d_OCSP_RESPID(id, NULL);
585 if (itmp <= 0)
586 return NULL;
587 idlen += itmp + 2;
588 }
589
590 if (s->tlsext_ocsp_exts) {
591 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
592 if (extlen < 0)
593 return NULL;
594 } else
595 extlen = 0;
596
597 if ((long)(limit - ret - 7 - extlen - idlen) < 0)
598 return NULL;
599 s2n(TLSEXT_TYPE_status_request, ret);
600 if (extlen + idlen > 0xFFF0)
601 return NULL;
602 s2n(extlen + idlen + 5, ret);
603 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
604 s2n(idlen, ret);
605 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++) {
606 /* save position of id len */
607 unsigned char *q = ret;
608 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
609 /* skip over id len */
610 ret += 2;
611 itmp = i2d_OCSP_RESPID(id, &ret);
612 /* write id len */
613 s2n(itmp, q);
614 }
615 s2n(extlen, ret);
616 if (extlen > 0)
617 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
618 }
619 # ifndef OPENSSL_NO_HEARTBEATS
620 /* Add Heartbeat extension */
621 if ((limit - ret - 4 - 1) < 0)
622 return NULL;
623 s2n(TLSEXT_TYPE_heartbeat, ret);
624 s2n(1, ret);
625 /*-
626 * Set mode:
627 * 1: peer may send requests
628 * 2: peer not allowed to send requests
629 */
630 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
631 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
632 else
633 *(ret++) = SSL_TLSEXT_HB_ENABLED;
634 # endif
635
636 # ifndef OPENSSL_NO_NEXTPROTONEG
637 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len) {
638 /*
639 * The client advertises an emtpy extension to indicate its support
640 * for Next Protocol Negotiation
641 */
642 if (limit - ret - 4 < 0)
643 return NULL;
644 s2n(TLSEXT_TYPE_next_proto_neg, ret);
645 s2n(0, ret);
646 }
647 # endif
648
649 # ifndef OPENSSL_NO_SRTP
650 if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)) {
651 int el;
652
653 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
654
655 if ((limit - ret - 4 - el) < 0)
656 return NULL;
657
658 s2n(TLSEXT_TYPE_use_srtp, ret);
659 s2n(el, ret);
660
661 if (ssl_add_clienthello_use_srtp_ext(s, ret, &el, el)) {
662 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
663 return NULL;
664 }
665 ret += el;
666 }
667 # endif
668 /*
669 * Add padding to workaround bugs in F5 terminators. See
670 * https://tools.ietf.org/html/draft-agl-tls-padding-03 NB: because this
671 * code works out the length of all existing extensions it MUST always
672 * appear last.
673 */
674 if (s->options & SSL_OP_TLSEXT_PADDING) {
675 int hlen = ret - (unsigned char *)s->init_buf->data;
676 /*
677 * The code in s23_clnt.c to build ClientHello messages includes the
678 * 5-byte record header in the buffer, while the code in s3_clnt.c
679 * does not.
680 */
681 if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
682 hlen -= 5;
683 if (hlen > 0xff && hlen < 0x200) {
684 hlen = 0x200 - hlen;
685 if (hlen >= 4)
686 hlen -= 4;
687 else
688 hlen = 0;
689
690 s2n(TLSEXT_TYPE_padding, ret);
691 s2n(hlen, ret);
692 memset(ret, 0, hlen);
693 ret += hlen;
694 }
695 }
696
697 if ((extdatalen = ret - orig - 2) == 0)
698 return orig;
699
700 s2n(extdatalen, orig);
701 return ret;
702 }
703
ssl_add_serverhello_tlsext(SSL * s,unsigned char * buf,unsigned char * limit)704 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *buf,
705 unsigned char *limit)
706 {
707 int extdatalen = 0;
708 unsigned char *orig = buf;
709 unsigned char *ret = buf;
710 # ifndef OPENSSL_NO_NEXTPROTONEG
711 int next_proto_neg_seen;
712 # endif
713
714 /*
715 * don't add extensions for SSLv3, unless doing secure renegotiation
716 */
717 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
718 return orig;
719
720 ret += 2;
721 if (ret >= limit)
722 return NULL; /* this really never occurs, but ... */
723
724 if (!s->hit && s->servername_done == 1
725 && s->session->tlsext_hostname != NULL) {
726 if ((long)(limit - ret - 4) < 0)
727 return NULL;
728
729 s2n(TLSEXT_TYPE_server_name, ret);
730 s2n(0, ret);
731 }
732
733 if (s->s3->send_connection_binding) {
734 int el;
735
736 if (!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0)) {
737 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
738 return NULL;
739 }
740
741 if ((limit - ret - 4 - el) < 0)
742 return NULL;
743
744 s2n(TLSEXT_TYPE_renegotiate, ret);
745 s2n(el, ret);
746
747 if (!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el)) {
748 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
749 return NULL;
750 }
751
752 ret += el;
753 }
754 # ifndef OPENSSL_NO_EC
755 if (s->tlsext_ecpointformatlist != NULL) {
756 /*
757 * Add TLS extension ECPointFormats to the ServerHello message
758 */
759 long lenmax;
760
761 if ((lenmax = limit - ret - 5) < 0)
762 return NULL;
763 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax)
764 return NULL;
765 if (s->tlsext_ecpointformatlist_length > 255) {
766 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
767 return NULL;
768 }
769
770 s2n(TLSEXT_TYPE_ec_point_formats, ret);
771 s2n(s->tlsext_ecpointformatlist_length + 1, ret);
772 *(ret++) = (unsigned char)s->tlsext_ecpointformatlist_length;
773 memcpy(ret, s->tlsext_ecpointformatlist,
774 s->tlsext_ecpointformatlist_length);
775 ret += s->tlsext_ecpointformatlist_length;
776
777 }
778 /*
779 * Currently the server should not respond with a SupportedCurves
780 * extension
781 */
782 # endif /* OPENSSL_NO_EC */
783
784 if (s->tlsext_ticket_expected && !(SSL_get_options(s) & SSL_OP_NO_TICKET)) {
785 if ((long)(limit - ret - 4) < 0)
786 return NULL;
787 s2n(TLSEXT_TYPE_session_ticket, ret);
788 s2n(0, ret);
789 }
790
791 if (s->tlsext_status_expected) {
792 if ((long)(limit - ret - 4) < 0)
793 return NULL;
794 s2n(TLSEXT_TYPE_status_request, ret);
795 s2n(0, ret);
796 }
797 # ifdef TLSEXT_TYPE_opaque_prf_input
798 if (s->s3->server_opaque_prf_input != NULL && s->version != DTLS1_VERSION) {
799 size_t sol = s->s3->server_opaque_prf_input_len;
800
801 if ((long)(limit - ret - 6 - sol) < 0)
802 return NULL;
803 if (sol > 0xFFFD) /* can't happen */
804 return NULL;
805
806 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
807 s2n(sol + 2, ret);
808 s2n(sol, ret);
809 memcpy(ret, s->s3->server_opaque_prf_input, sol);
810 ret += sol;
811 }
812 # endif
813
814 # ifndef OPENSSL_NO_SRTP
815 if (SSL_IS_DTLS(s) && s->srtp_profile) {
816 int el;
817
818 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
819
820 if ((limit - ret - 4 - el) < 0)
821 return NULL;
822
823 s2n(TLSEXT_TYPE_use_srtp, ret);
824 s2n(el, ret);
825
826 if (ssl_add_serverhello_use_srtp_ext(s, ret, &el, el)) {
827 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
828 return NULL;
829 }
830 ret += el;
831 }
832 # endif
833
834 if (((s->s3->tmp.new_cipher->id & 0xFFFF) == 0x80
835 || (s->s3->tmp.new_cipher->id & 0xFFFF) == 0x81)
836 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG)) {
837 const unsigned char cryptopro_ext[36] = {
838 0xfd, 0xe8, /* 65000 */
839 0x00, 0x20, /* 32 bytes length */
840 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
841 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
842 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
843 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17
844 };
845 if (limit - ret < 36)
846 return NULL;
847 memcpy(ret, cryptopro_ext, 36);
848 ret += 36;
849
850 }
851 # ifndef OPENSSL_NO_HEARTBEATS
852 /* Add Heartbeat extension if we've received one */
853 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) {
854 if ((limit - ret - 4 - 1) < 0)
855 return NULL;
856 s2n(TLSEXT_TYPE_heartbeat, ret);
857 s2n(1, ret);
858 /*-
859 * Set mode:
860 * 1: peer may send requests
861 * 2: peer not allowed to send requests
862 */
863 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
864 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
865 else
866 *(ret++) = SSL_TLSEXT_HB_ENABLED;
867
868 }
869 # endif
870
871 # ifndef OPENSSL_NO_NEXTPROTONEG
872 next_proto_neg_seen = s->s3->next_proto_neg_seen;
873 s->s3->next_proto_neg_seen = 0;
874 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb) {
875 const unsigned char *npa;
876 unsigned int npalen;
877 int r;
878
879 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen,
880 s->
881 ctx->next_protos_advertised_cb_arg);
882 if (r == SSL_TLSEXT_ERR_OK) {
883 if ((long)(limit - ret - 4 - npalen) < 0)
884 return NULL;
885 s2n(TLSEXT_TYPE_next_proto_neg, ret);
886 s2n(npalen, ret);
887 memcpy(ret, npa, npalen);
888 ret += npalen;
889 s->s3->next_proto_neg_seen = 1;
890 }
891 }
892 # endif
893
894 if ((extdatalen = ret - orig - 2) == 0)
895 return orig;
896
897 s2n(extdatalen, orig);
898 return ret;
899 }
900
901 # ifndef OPENSSL_NO_EC
902 /*-
903 * ssl_check_for_safari attempts to fingerprint Safari using OS X
904 * SecureTransport using the TLS extension block in |d|, of length |n|.
905 * Safari, since 10.6, sends exactly these extensions, in this order:
906 * SNI,
907 * elliptic_curves
908 * ec_point_formats
909 *
910 * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
911 * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
912 * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
913 * 10.8..10.8.3 (which don't work).
914 */
ssl_check_for_safari(SSL * s,const unsigned char * data,const unsigned char * limit)915 static void ssl_check_for_safari(SSL *s, const unsigned char *data,
916 const unsigned char *limit)
917 {
918 unsigned short type, size;
919 static const unsigned char kSafariExtensionsBlock[] = {
920 0x00, 0x0a, /* elliptic_curves extension */
921 0x00, 0x08, /* 8 bytes */
922 0x00, 0x06, /* 6 bytes of curve ids */
923 0x00, 0x17, /* P-256 */
924 0x00, 0x18, /* P-384 */
925 0x00, 0x19, /* P-521 */
926
927 0x00, 0x0b, /* ec_point_formats */
928 0x00, 0x02, /* 2 bytes */
929 0x01, /* 1 point format */
930 0x00, /* uncompressed */
931 };
932
933 /* The following is only present in TLS 1.2 */
934 static const unsigned char kSafariTLS12ExtensionsBlock[] = {
935 0x00, 0x0d, /* signature_algorithms */
936 0x00, 0x0c, /* 12 bytes */
937 0x00, 0x0a, /* 10 bytes */
938 0x05, 0x01, /* SHA-384/RSA */
939 0x04, 0x01, /* SHA-256/RSA */
940 0x02, 0x01, /* SHA-1/RSA */
941 0x04, 0x03, /* SHA-256/ECDSA */
942 0x02, 0x03, /* SHA-1/ECDSA */
943 };
944
945 if (limit - data <= 2)
946 return;
947 data += 2;
948
949 if (limit - data < 4)
950 return;
951 n2s(data, type);
952 n2s(data, size);
953
954 if (type != TLSEXT_TYPE_server_name)
955 return;
956
957 if (limit - data < size)
958 return;
959 data += size;
960
961 if (TLS1_get_client_version(s) >= TLS1_2_VERSION) {
962 const size_t len1 = sizeof(kSafariExtensionsBlock);
963 const size_t len2 = sizeof(kSafariTLS12ExtensionsBlock);
964
965 if (limit - data != (int)(len1 + len2))
966 return;
967 if (memcmp(data, kSafariExtensionsBlock, len1) != 0)
968 return;
969 if (memcmp(data + len1, kSafariTLS12ExtensionsBlock, len2) != 0)
970 return;
971 } else {
972 const size_t len = sizeof(kSafariExtensionsBlock);
973
974 if (limit - data != (int)(len))
975 return;
976 if (memcmp(data, kSafariExtensionsBlock, len) != 0)
977 return;
978 }
979
980 s->s3->is_probably_safari = 1;
981 }
982 # endif /* !OPENSSL_NO_EC */
983
ssl_parse_clienthello_tlsext(SSL * s,unsigned char ** p,unsigned char * limit,int * al)984 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p,
985 unsigned char *limit, int *al)
986 {
987 unsigned short type;
988 unsigned short size;
989 unsigned short len;
990 unsigned char *data = *p;
991 int renegotiate_seen = 0;
992 int sigalg_seen = 0;
993
994 s->servername_done = 0;
995 s->tlsext_status_type = -1;
996 # ifndef OPENSSL_NO_NEXTPROTONEG
997 s->s3->next_proto_neg_seen = 0;
998 # endif
999
1000 # ifndef OPENSSL_NO_HEARTBEATS
1001 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1002 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1003 # endif
1004
1005 # ifndef OPENSSL_NO_EC
1006 if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
1007 ssl_check_for_safari(s, data, limit);
1008 # endif /* !OPENSSL_NO_EC */
1009
1010 # ifndef OPENSSL_NO_SRP
1011 if (s->srp_ctx.login != NULL) {
1012 OPENSSL_free(s->srp_ctx.login);
1013 s->srp_ctx.login = NULL;
1014 }
1015 # endif
1016
1017 s->srtp_profile = NULL;
1018
1019 if (data == limit)
1020 goto ri_check;
1021
1022 if (limit - data < 2)
1023 goto err;
1024
1025 n2s(data, len);
1026
1027 if (limit - data != len)
1028 goto err;
1029
1030 while (limit - data >= 4) {
1031 n2s(data, type);
1032 n2s(data, size);
1033
1034 if (limit - data < size)
1035 goto err;
1036 # if 0
1037 fprintf(stderr, "Received extension type %d size %d\n", type, size);
1038 # endif
1039 if (s->tlsext_debug_cb)
1040 s->tlsext_debug_cb(s, 0, type, data, size, s->tlsext_debug_arg);
1041 /*-
1042 * The servername extension is treated as follows:
1043 *
1044 * - Only the hostname type is supported with a maximum length of 255.
1045 * - The servername is rejected if too long or if it contains zeros,
1046 * in which case an fatal alert is generated.
1047 * - The servername field is maintained together with the session cache.
1048 * - When a session is resumed, the servername call back invoked in order
1049 * to allow the application to position itself to the right context.
1050 * - The servername is acknowledged if it is new for a session or when
1051 * it is identical to a previously used for the same session.
1052 * Applications can control the behaviour. They can at any time
1053 * set a 'desirable' servername for a new SSL object. This can be the
1054 * case for example with HTTPS when a Host: header field is received and
1055 * a renegotiation is requested. In this case, a possible servername
1056 * presented in the new client hello is only acknowledged if it matches
1057 * the value of the Host: field.
1058 * - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1059 * if they provide for changing an explicit servername context for the
1060 * session, i.e. when the session has been established with a servername
1061 * extension.
1062 * - On session reconnect, the servername extension may be absent.
1063 *
1064 */
1065
1066 if (type == TLSEXT_TYPE_server_name) {
1067 unsigned char *sdata;
1068 int servname_type;
1069 int dsize;
1070
1071 if (size < 2)
1072 goto err;
1073 n2s(data, dsize);
1074 size -= 2;
1075 if (dsize > size)
1076 goto err;
1077
1078 sdata = data;
1079 while (dsize > 3) {
1080 servname_type = *(sdata++);
1081 n2s(sdata, len);
1082 dsize -= 3;
1083
1084 if (len > dsize)
1085 goto err;
1086
1087 if (s->servername_done == 0)
1088 switch (servname_type) {
1089 case TLSEXT_NAMETYPE_host_name:
1090 if (!s->hit) {
1091 if (s->session->tlsext_hostname)
1092 goto err;
1093
1094 if (len > TLSEXT_MAXLEN_host_name) {
1095 *al = TLS1_AD_UNRECOGNIZED_NAME;
1096 return 0;
1097 }
1098 if ((s->session->tlsext_hostname =
1099 OPENSSL_malloc(len + 1)) == NULL) {
1100 *al = TLS1_AD_INTERNAL_ERROR;
1101 return 0;
1102 }
1103 memcpy(s->session->tlsext_hostname, sdata, len);
1104 s->session->tlsext_hostname[len] = '\0';
1105 if (strlen(s->session->tlsext_hostname) != len) {
1106 OPENSSL_free(s->session->tlsext_hostname);
1107 s->session->tlsext_hostname = NULL;
1108 *al = TLS1_AD_UNRECOGNIZED_NAME;
1109 return 0;
1110 }
1111 s->servername_done = 1;
1112
1113 } else
1114 s->servername_done = s->session->tlsext_hostname
1115 && strlen(s->session->tlsext_hostname) == len
1116 && strncmp(s->session->tlsext_hostname,
1117 (char *)sdata, len) == 0;
1118
1119 break;
1120
1121 default:
1122 break;
1123 }
1124
1125 dsize -= len;
1126 }
1127 if (dsize != 0)
1128 goto err;
1129
1130 }
1131 # ifndef OPENSSL_NO_SRP
1132 else if (type == TLSEXT_TYPE_srp) {
1133 if (size == 0 || ((len = data[0])) != (size - 1))
1134 goto err;
1135 if (s->srp_ctx.login != NULL)
1136 goto err;
1137 if ((s->srp_ctx.login = OPENSSL_malloc(len + 1)) == NULL)
1138 return -1;
1139 memcpy(s->srp_ctx.login, &data[1], len);
1140 s->srp_ctx.login[len] = '\0';
1141
1142 if (strlen(s->srp_ctx.login) != len)
1143 goto err;
1144 }
1145 # endif
1146
1147 # ifndef OPENSSL_NO_EC
1148 else if (type == TLSEXT_TYPE_ec_point_formats) {
1149 unsigned char *sdata = data;
1150 int ecpointformatlist_length = *(sdata++);
1151
1152 if (ecpointformatlist_length != size - 1)
1153 goto err;
1154 if (!s->hit) {
1155 if (s->session->tlsext_ecpointformatlist) {
1156 OPENSSL_free(s->session->tlsext_ecpointformatlist);
1157 s->session->tlsext_ecpointformatlist = NULL;
1158 }
1159 s->session->tlsext_ecpointformatlist_length = 0;
1160 if ((s->session->tlsext_ecpointformatlist =
1161 OPENSSL_malloc(ecpointformatlist_length)) == NULL) {
1162 *al = TLS1_AD_INTERNAL_ERROR;
1163 return 0;
1164 }
1165 s->session->tlsext_ecpointformatlist_length =
1166 ecpointformatlist_length;
1167 memcpy(s->session->tlsext_ecpointformatlist, sdata,
1168 ecpointformatlist_length);
1169 }
1170 # if 0
1171 fprintf(stderr,
1172 "ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ",
1173 s->session->tlsext_ecpointformatlist_length);
1174 sdata = s->session->tlsext_ecpointformatlist;
1175 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1176 fprintf(stderr, "%i ", *(sdata++));
1177 fprintf(stderr, "\n");
1178 # endif
1179 } else if (type == TLSEXT_TYPE_elliptic_curves) {
1180 unsigned char *sdata = data;
1181 int ellipticcurvelist_length = (*(sdata++) << 8);
1182 ellipticcurvelist_length += (*(sdata++));
1183
1184 if (ellipticcurvelist_length != size - 2 ||
1185 ellipticcurvelist_length < 1 ||
1186 /* Each NamedCurve is 2 bytes. */
1187 ellipticcurvelist_length & 1)
1188 goto err;
1189
1190 if (!s->hit) {
1191 if (s->session->tlsext_ellipticcurvelist)
1192 goto err;
1193
1194 s->session->tlsext_ellipticcurvelist_length = 0;
1195 if ((s->session->tlsext_ellipticcurvelist =
1196 OPENSSL_malloc(ellipticcurvelist_length)) == NULL) {
1197 *al = TLS1_AD_INTERNAL_ERROR;
1198 return 0;
1199 }
1200 s->session->tlsext_ellipticcurvelist_length =
1201 ellipticcurvelist_length;
1202 memcpy(s->session->tlsext_ellipticcurvelist, sdata,
1203 ellipticcurvelist_length);
1204 }
1205 # if 0
1206 fprintf(stderr,
1207 "ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ",
1208 s->session->tlsext_ellipticcurvelist_length);
1209 sdata = s->session->tlsext_ellipticcurvelist;
1210 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
1211 fprintf(stderr, "%i ", *(sdata++));
1212 fprintf(stderr, "\n");
1213 # endif
1214 }
1215 # endif /* OPENSSL_NO_EC */
1216 # ifdef TLSEXT_TYPE_opaque_prf_input
1217 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1218 s->version != DTLS1_VERSION) {
1219 unsigned char *sdata = data;
1220
1221 if (size < 2) {
1222 *al = SSL_AD_DECODE_ERROR;
1223 return 0;
1224 }
1225 n2s(sdata, s->s3->client_opaque_prf_input_len);
1226 if (s->s3->client_opaque_prf_input_len != size - 2) {
1227 *al = SSL_AD_DECODE_ERROR;
1228 return 0;
1229 }
1230
1231 if (s->s3->client_opaque_prf_input != NULL) {
1232 /* shouldn't really happen */
1233 OPENSSL_free(s->s3->client_opaque_prf_input);
1234 }
1235
1236 /* dummy byte just to get non-NULL */
1237 if (s->s3->client_opaque_prf_input_len == 0)
1238 s->s3->client_opaque_prf_input = OPENSSL_malloc(1);
1239 else
1240 s->s3->client_opaque_prf_input =
1241 BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
1242 if (s->s3->client_opaque_prf_input == NULL) {
1243 *al = TLS1_AD_INTERNAL_ERROR;
1244 return 0;
1245 }
1246 }
1247 # endif
1248 else if (type == TLSEXT_TYPE_session_ticket) {
1249 if (s->tls_session_ticket_ext_cb &&
1250 !s->tls_session_ticket_ext_cb(s, data, size,
1251 s->tls_session_ticket_ext_cb_arg))
1252 {
1253 *al = TLS1_AD_INTERNAL_ERROR;
1254 return 0;
1255 }
1256 } else if (type == TLSEXT_TYPE_renegotiate) {
1257 if (!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
1258 return 0;
1259 renegotiate_seen = 1;
1260 } else if (type == TLSEXT_TYPE_signature_algorithms) {
1261 int dsize;
1262 if (sigalg_seen || size < 2)
1263 goto err;
1264 sigalg_seen = 1;
1265 n2s(data, dsize);
1266 size -= 2;
1267 if (dsize != size || dsize & 1)
1268 goto err;
1269 if (!tls1_process_sigalgs(s, data, dsize))
1270 goto err;
1271 } else if (type == TLSEXT_TYPE_status_request &&
1272 s->version != DTLS1_VERSION) {
1273
1274 if (size < 5)
1275 goto err;
1276
1277 s->tlsext_status_type = *data++;
1278 size--;
1279 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp) {
1280 const unsigned char *sdata;
1281 int dsize;
1282 /* Read in responder_id_list */
1283 n2s(data, dsize);
1284 size -= 2;
1285 if (dsize > size)
1286 goto err;
1287
1288 /*
1289 * We remove any OCSP_RESPIDs from a previous handshake
1290 * to prevent unbounded memory growth - CVE-2016-6304
1291 */
1292 sk_OCSP_RESPID_pop_free(s->tlsext_ocsp_ids,
1293 OCSP_RESPID_free);
1294 if (dsize > 0) {
1295 s->tlsext_ocsp_ids = sk_OCSP_RESPID_new_null();
1296 if (s->tlsext_ocsp_ids == NULL) {
1297 *al = SSL_AD_INTERNAL_ERROR;
1298 return 0;
1299 }
1300 } else {
1301 s->tlsext_ocsp_ids = NULL;
1302 }
1303
1304 while (dsize > 0) {
1305 OCSP_RESPID *id;
1306 int idsize;
1307 if (dsize < 4)
1308 goto err;
1309 n2s(data, idsize);
1310 dsize -= 2 + idsize;
1311 size -= 2 + idsize;
1312 if (dsize < 0)
1313 goto err;
1314 sdata = data;
1315 data += idsize;
1316 id = d2i_OCSP_RESPID(NULL, &sdata, idsize);
1317 if (!id)
1318 goto err;
1319 if (data != sdata) {
1320 OCSP_RESPID_free(id);
1321 goto err;
1322 }
1323 if (!sk_OCSP_RESPID_push(s->tlsext_ocsp_ids, id)) {
1324 OCSP_RESPID_free(id);
1325 *al = SSL_AD_INTERNAL_ERROR;
1326 return 0;
1327 }
1328 }
1329
1330 /* Read in request_extensions */
1331 if (size < 2)
1332 goto err;
1333 n2s(data, dsize);
1334 size -= 2;
1335 if (dsize != size)
1336 goto err;
1337 sdata = data;
1338 if (dsize > 0) {
1339 if (s->tlsext_ocsp_exts) {
1340 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
1341 X509_EXTENSION_free);
1342 }
1343
1344 s->tlsext_ocsp_exts =
1345 d2i_X509_EXTENSIONS(NULL, &sdata, dsize);
1346 if (!s->tlsext_ocsp_exts || (data + dsize != sdata))
1347 goto err;
1348 }
1349 }
1350 /*
1351 * We don't know what to do with any other type * so ignore it.
1352 */
1353 else
1354 s->tlsext_status_type = -1;
1355 }
1356 # ifndef OPENSSL_NO_HEARTBEATS
1357 else if (type == TLSEXT_TYPE_heartbeat) {
1358 switch (data[0]) {
1359 case 0x01: /* Client allows us to send HB requests */
1360 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1361 break;
1362 case 0x02: /* Client doesn't accept HB requests */
1363 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1364 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1365 break;
1366 default:
1367 *al = SSL_AD_ILLEGAL_PARAMETER;
1368 return 0;
1369 }
1370 }
1371 # endif
1372 # ifndef OPENSSL_NO_NEXTPROTONEG
1373 else if (type == TLSEXT_TYPE_next_proto_neg &&
1374 s->s3->tmp.finish_md_len == 0) {
1375 /*-
1376 * We shouldn't accept this extension on a
1377 * renegotiation.
1378 *
1379 * s->new_session will be set on renegotiation, but we
1380 * probably shouldn't rely that it couldn't be set on
1381 * the initial renegotation too in certain cases (when
1382 * there's some other reason to disallow resuming an
1383 * earlier session -- the current code won't be doing
1384 * anything like that, but this might change).
1385 *
1386 * A valid sign that there's been a previous handshake
1387 * in this connection is if s->s3->tmp.finish_md_len >
1388 * 0. (We are talking about a check that will happen
1389 * in the Hello protocol round, well before a new
1390 * Finished message could have been computed.)
1391 */
1392 s->s3->next_proto_neg_seen = 1;
1393 }
1394 # endif
1395
1396 /* session ticket processed earlier */
1397 # ifndef OPENSSL_NO_SRTP
1398 else if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)
1399 && type == TLSEXT_TYPE_use_srtp) {
1400 if (ssl_parse_clienthello_use_srtp_ext(s, data, size, al))
1401 return 0;
1402 }
1403 # endif
1404
1405 data += size;
1406 }
1407
1408 /* Spurious data on the end */
1409 if (data != limit)
1410 goto err;
1411
1412 *p = data;
1413
1414 ri_check:
1415
1416 /* Need RI if renegotiating */
1417
1418 if (!renegotiate_seen && s->renegotiate &&
1419 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
1420 *al = SSL_AD_HANDSHAKE_FAILURE;
1421 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,
1422 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1423 return 0;
1424 }
1425
1426 return 1;
1427 err:
1428 *al = SSL_AD_DECODE_ERROR;
1429 return 0;
1430 }
1431
1432 # ifndef OPENSSL_NO_NEXTPROTONEG
1433 /*
1434 * ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1435 * elements of zero length are allowed and the set of elements must exactly
1436 * fill the length of the block.
1437 */
ssl_next_proto_validate(unsigned char * d,unsigned len)1438 static char ssl_next_proto_validate(unsigned char *d, unsigned len)
1439 {
1440 unsigned int off = 0;
1441
1442 while (off < len) {
1443 if (d[off] == 0)
1444 return 0;
1445 off += d[off];
1446 off++;
1447 }
1448
1449 return off == len;
1450 }
1451 # endif
1452
ssl_parse_serverhello_tlsext(SSL * s,unsigned char ** p,unsigned char * d,int n,int * al)1453 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d,
1454 int n, int *al)
1455 {
1456 unsigned short length;
1457 unsigned short type;
1458 unsigned short size;
1459 unsigned char *data = *p;
1460 int tlsext_servername = 0;
1461 int renegotiate_seen = 0;
1462
1463 # ifndef OPENSSL_NO_NEXTPROTONEG
1464 s->s3->next_proto_neg_seen = 0;
1465 # endif
1466 s->tlsext_ticket_expected = 0;
1467
1468 # ifndef OPENSSL_NO_HEARTBEATS
1469 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1470 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1471 # endif
1472
1473 if ((d + n) - data <= 2)
1474 goto ri_check;
1475
1476 n2s(data, length);
1477 if ((d + n) - data != length) {
1478 *al = SSL_AD_DECODE_ERROR;
1479 return 0;
1480 }
1481
1482 while ((d + n) - data >= 4) {
1483 n2s(data, type);
1484 n2s(data, size);
1485
1486 if ((d + n) - data < size)
1487 goto ri_check;
1488
1489 if (s->tlsext_debug_cb)
1490 s->tlsext_debug_cb(s, 1, type, data, size, s->tlsext_debug_arg);
1491
1492 if (type == TLSEXT_TYPE_server_name) {
1493 if (s->tlsext_hostname == NULL || size > 0) {
1494 *al = TLS1_AD_UNRECOGNIZED_NAME;
1495 return 0;
1496 }
1497 tlsext_servername = 1;
1498 }
1499 # ifndef OPENSSL_NO_EC
1500 else if (type == TLSEXT_TYPE_ec_point_formats) {
1501 unsigned char *sdata = data;
1502 int ecpointformatlist_length = *(sdata++);
1503
1504 if (ecpointformatlist_length != size - 1 ||
1505 ecpointformatlist_length < 1) {
1506 *al = TLS1_AD_DECODE_ERROR;
1507 return 0;
1508 }
1509 if (!s->hit) {
1510 s->session->tlsext_ecpointformatlist_length = 0;
1511 if (s->session->tlsext_ecpointformatlist != NULL)
1512 OPENSSL_free(s->session->tlsext_ecpointformatlist);
1513 if ((s->session->tlsext_ecpointformatlist =
1514 OPENSSL_malloc(ecpointformatlist_length)) == NULL) {
1515 *al = TLS1_AD_INTERNAL_ERROR;
1516 return 0;
1517 }
1518 s->session->tlsext_ecpointformatlist_length =
1519 ecpointformatlist_length;
1520 memcpy(s->session->tlsext_ecpointformatlist, sdata,
1521 ecpointformatlist_length);
1522 }
1523 # if 0
1524 fprintf(stderr,
1525 "ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1526 sdata = s->session->tlsext_ecpointformatlist;
1527 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1528 fprintf(stderr, "%i ", *(sdata++));
1529 fprintf(stderr, "\n");
1530 # endif
1531 }
1532 # endif /* OPENSSL_NO_EC */
1533
1534 else if (type == TLSEXT_TYPE_session_ticket) {
1535 if (s->tls_session_ticket_ext_cb &&
1536 !s->tls_session_ticket_ext_cb(s, data, size,
1537 s->tls_session_ticket_ext_cb_arg))
1538 {
1539 *al = TLS1_AD_INTERNAL_ERROR;
1540 return 0;
1541 }
1542 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1543 || (size > 0)) {
1544 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1545 return 0;
1546 }
1547 s->tlsext_ticket_expected = 1;
1548 }
1549 # ifdef TLSEXT_TYPE_opaque_prf_input
1550 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1551 s->version != DTLS1_VERSION) {
1552 unsigned char *sdata = data;
1553
1554 if (size < 2) {
1555 *al = SSL_AD_DECODE_ERROR;
1556 return 0;
1557 }
1558 n2s(sdata, s->s3->server_opaque_prf_input_len);
1559 if (s->s3->server_opaque_prf_input_len != size - 2) {
1560 *al = SSL_AD_DECODE_ERROR;
1561 return 0;
1562 }
1563
1564 if (s->s3->server_opaque_prf_input != NULL) {
1565 /* shouldn't really happen */
1566 OPENSSL_free(s->s3->server_opaque_prf_input);
1567 }
1568 if (s->s3->server_opaque_prf_input_len == 0) {
1569 /* dummy byte just to get non-NULL */
1570 s->s3->server_opaque_prf_input = OPENSSL_malloc(1);
1571 } else {
1572 s->s3->server_opaque_prf_input =
1573 BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
1574 }
1575
1576 if (s->s3->server_opaque_prf_input == NULL) {
1577 *al = TLS1_AD_INTERNAL_ERROR;
1578 return 0;
1579 }
1580 }
1581 # endif
1582 else if (type == TLSEXT_TYPE_status_request &&
1583 s->version != DTLS1_VERSION) {
1584 /*
1585 * MUST be empty and only sent if we've requested a status
1586 * request message.
1587 */
1588 if ((s->tlsext_status_type == -1) || (size > 0)) {
1589 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1590 return 0;
1591 }
1592 /* Set flag to expect CertificateStatus message */
1593 s->tlsext_status_expected = 1;
1594 }
1595 # ifndef OPENSSL_NO_NEXTPROTONEG
1596 else if (type == TLSEXT_TYPE_next_proto_neg &&
1597 s->s3->tmp.finish_md_len == 0) {
1598 unsigned char *selected;
1599 unsigned char selected_len;
1600
1601 /* We must have requested it. */
1602 if (s->ctx->next_proto_select_cb == NULL) {
1603 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1604 return 0;
1605 }
1606 /* The data must be valid */
1607 if (!ssl_next_proto_validate(data, size)) {
1608 *al = TLS1_AD_DECODE_ERROR;
1609 return 0;
1610 }
1611 if (s->
1612 ctx->next_proto_select_cb(s, &selected, &selected_len, data,
1613 size,
1614 s->ctx->next_proto_select_cb_arg) !=
1615 SSL_TLSEXT_ERR_OK) {
1616 *al = TLS1_AD_INTERNAL_ERROR;
1617 return 0;
1618 }
1619 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
1620 if (!s->next_proto_negotiated) {
1621 *al = TLS1_AD_INTERNAL_ERROR;
1622 return 0;
1623 }
1624 memcpy(s->next_proto_negotiated, selected, selected_len);
1625 s->next_proto_negotiated_len = selected_len;
1626 s->s3->next_proto_neg_seen = 1;
1627 }
1628 # endif
1629 else if (type == TLSEXT_TYPE_renegotiate) {
1630 if (!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
1631 return 0;
1632 renegotiate_seen = 1;
1633 }
1634 # ifndef OPENSSL_NO_HEARTBEATS
1635 else if (type == TLSEXT_TYPE_heartbeat) {
1636 switch (data[0]) {
1637 case 0x01: /* Server allows us to send HB requests */
1638 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1639 break;
1640 case 0x02: /* Server doesn't accept HB requests */
1641 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1642 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1643 break;
1644 default:
1645 *al = SSL_AD_ILLEGAL_PARAMETER;
1646 return 0;
1647 }
1648 }
1649 # endif
1650 # ifndef OPENSSL_NO_SRTP
1651 else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_use_srtp) {
1652 if (ssl_parse_serverhello_use_srtp_ext(s, data, size, al))
1653 return 0;
1654 }
1655 # endif
1656
1657 data += size;
1658 }
1659
1660 if (data != d + n) {
1661 *al = SSL_AD_DECODE_ERROR;
1662 return 0;
1663 }
1664
1665 if (!s->hit && tlsext_servername == 1) {
1666 if (s->tlsext_hostname) {
1667 if (s->session->tlsext_hostname == NULL) {
1668 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
1669 if (!s->session->tlsext_hostname) {
1670 *al = SSL_AD_UNRECOGNIZED_NAME;
1671 return 0;
1672 }
1673 } else {
1674 *al = SSL_AD_DECODE_ERROR;
1675 return 0;
1676 }
1677 }
1678 }
1679
1680 *p = data;
1681
1682 ri_check:
1683
1684 /*
1685 * Determine if we need to see RI. Strictly speaking if we want to avoid
1686 * an attack we should *always* see RI even on initial server hello
1687 * because the client doesn't see any renegotiation during an attack.
1688 * However this would mean we could not connect to any server which
1689 * doesn't support RI so for the immediate future tolerate RI absence on
1690 * initial connect only.
1691 */
1692 if (!renegotiate_seen && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
1693 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
1694 *al = SSL_AD_HANDSHAKE_FAILURE;
1695 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,
1696 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1697 return 0;
1698 }
1699
1700 return 1;
1701 }
1702
ssl_prepare_clienthello_tlsext(SSL * s)1703 int ssl_prepare_clienthello_tlsext(SSL *s)
1704 {
1705 # ifndef OPENSSL_NO_EC
1706 /*
1707 * If we are client and using an elliptic curve cryptography cipher
1708 * suite, send the point formats and elliptic curves we support.
1709 */
1710 int using_ecc = 0;
1711 int i;
1712 unsigned char *j;
1713 unsigned long alg_k, alg_a;
1714 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1715
1716 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++) {
1717 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1718
1719 alg_k = c->algorithm_mkey;
1720 alg_a = c->algorithm_auth;
1721 if ((alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)
1722 || (alg_a & SSL_aECDSA))) {
1723 using_ecc = 1;
1724 break;
1725 }
1726 }
1727 using_ecc = using_ecc && (s->version >= TLS1_VERSION);
1728 if (using_ecc) {
1729 if (s->tlsext_ecpointformatlist != NULL)
1730 OPENSSL_free(s->tlsext_ecpointformatlist);
1731 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) {
1732 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,
1733 ERR_R_MALLOC_FAILURE);
1734 return -1;
1735 }
1736 s->tlsext_ecpointformatlist_length = 3;
1737 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1738 s->tlsext_ecpointformatlist[1] =
1739 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1740 s->tlsext_ecpointformatlist[2] =
1741 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1742
1743 /* we support all named elliptic curves in RFC 4492 */
1744 if (s->tlsext_ellipticcurvelist != NULL)
1745 OPENSSL_free(s->tlsext_ellipticcurvelist);
1746 s->tlsext_ellipticcurvelist_length =
1747 sizeof(pref_list) / sizeof(pref_list[0]) * 2;
1748 if ((s->tlsext_ellipticcurvelist =
1749 OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL) {
1750 s->tlsext_ellipticcurvelist_length = 0;
1751 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,
1752 ERR_R_MALLOC_FAILURE);
1753 return -1;
1754 }
1755 for (i = 0, j = s->tlsext_ellipticcurvelist; (unsigned int)i <
1756 sizeof(pref_list) / sizeof(pref_list[0]); i++) {
1757 int id = tls1_ec_nid2curve_id(pref_list[i]);
1758 s2n(id, j);
1759 }
1760 }
1761 # endif /* OPENSSL_NO_EC */
1762
1763 # ifdef TLSEXT_TYPE_opaque_prf_input
1764 {
1765 int r = 1;
1766
1767 if (s->ctx->tlsext_opaque_prf_input_callback != 0) {
1768 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0,
1769 s->
1770 ctx->tlsext_opaque_prf_input_callback_arg);
1771 if (!r)
1772 return -1;
1773 }
1774
1775 if (s->tlsext_opaque_prf_input != NULL) {
1776 if (s->s3->client_opaque_prf_input != NULL) {
1777 /* shouldn't really happen */
1778 OPENSSL_free(s->s3->client_opaque_prf_input);
1779 }
1780
1781 if (s->tlsext_opaque_prf_input_len == 0) {
1782 /* dummy byte just to get non-NULL */
1783 s->s3->client_opaque_prf_input = OPENSSL_malloc(1);
1784 } else {
1785 s->s3->client_opaque_prf_input =
1786 BUF_memdup(s->tlsext_opaque_prf_input,
1787 s->tlsext_opaque_prf_input_len);
1788 }
1789 if (s->s3->client_opaque_prf_input == NULL) {
1790 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,
1791 ERR_R_MALLOC_FAILURE);
1792 return -1;
1793 }
1794 s->s3->client_opaque_prf_input_len =
1795 s->tlsext_opaque_prf_input_len;
1796 }
1797
1798 if (r == 2)
1799 /*
1800 * at callback's request, insist on receiving an appropriate
1801 * server opaque PRF input
1802 */
1803 s->s3->server_opaque_prf_input_len =
1804 s->tlsext_opaque_prf_input_len;
1805 }
1806 # endif
1807
1808 return 1;
1809 }
1810
ssl_prepare_serverhello_tlsext(SSL * s)1811 int ssl_prepare_serverhello_tlsext(SSL *s)
1812 {
1813 # ifndef OPENSSL_NO_EC
1814 /*
1815 * If we are server and using an ECC cipher suite, send the point formats
1816 * we support if the client sent us an ECPointsFormat extension. Note
1817 * that the server is not supposed to send an EllipticCurves extension.
1818 */
1819
1820 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1821 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1822 int using_ecc = (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe))
1823 || (alg_a & SSL_aECDSA);
1824 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1825
1826 if (using_ecc) {
1827 if (s->tlsext_ecpointformatlist != NULL)
1828 OPENSSL_free(s->tlsext_ecpointformatlist);
1829 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL) {
1830 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,
1831 ERR_R_MALLOC_FAILURE);
1832 return -1;
1833 }
1834 s->tlsext_ecpointformatlist_length = 3;
1835 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1836 s->tlsext_ecpointformatlist[1] =
1837 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1838 s->tlsext_ecpointformatlist[2] =
1839 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1840 }
1841 # endif /* OPENSSL_NO_EC */
1842
1843 return 1;
1844 }
1845
ssl_check_clienthello_tlsext_early(SSL * s)1846 int ssl_check_clienthello_tlsext_early(SSL *s)
1847 {
1848 int ret = SSL_TLSEXT_ERR_NOACK;
1849 int al = SSL_AD_UNRECOGNIZED_NAME;
1850
1851 # ifndef OPENSSL_NO_EC
1852 /*
1853 * The handling of the ECPointFormats extension is done elsewhere, namely
1854 * in ssl3_choose_cipher in s3_lib.c.
1855 */
1856 /*
1857 * The handling of the EllipticCurves extension is done elsewhere, namely
1858 * in ssl3_choose_cipher in s3_lib.c.
1859 */
1860 # endif
1861
1862 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1863 ret =
1864 s->ctx->tlsext_servername_callback(s, &al,
1865 s->ctx->tlsext_servername_arg);
1866 else if (s->initial_ctx != NULL
1867 && s->initial_ctx->tlsext_servername_callback != 0)
1868 ret =
1869 s->initial_ctx->tlsext_servername_callback(s, &al,
1870 s->
1871 initial_ctx->tlsext_servername_arg);
1872
1873 # ifdef TLSEXT_TYPE_opaque_prf_input
1874 {
1875 /*
1876 * This sort of belongs into ssl_prepare_serverhello_tlsext(), but we
1877 * might be sending an alert in response to the client hello, so this
1878 * has to happen here in ssl_check_clienthello_tlsext_early().
1879 */
1880
1881 int r = 1;
1882
1883 if (s->ctx->tlsext_opaque_prf_input_callback != 0) {
1884 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0,
1885 s->
1886 ctx->tlsext_opaque_prf_input_callback_arg);
1887 if (!r) {
1888 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1889 al = SSL_AD_INTERNAL_ERROR;
1890 goto err;
1891 }
1892 }
1893
1894 if (s->s3->server_opaque_prf_input != NULL) {
1895 /* shouldn't really happen */
1896 OPENSSL_free(s->s3->server_opaque_prf_input);
1897 }
1898 s->s3->server_opaque_prf_input = NULL;
1899
1900 if (s->tlsext_opaque_prf_input != NULL) {
1901 if (s->s3->client_opaque_prf_input != NULL &&
1902 s->s3->client_opaque_prf_input_len ==
1903 s->tlsext_opaque_prf_input_len) {
1904 /*
1905 * can only use this extension if we have a server opaque PRF
1906 * input of the same length as the client opaque PRF input!
1907 */
1908
1909 if (s->tlsext_opaque_prf_input_len == 0) {
1910 /* dummy byte just to get non-NULL */
1911 s->s3->server_opaque_prf_input = OPENSSL_malloc(1);
1912 } else {
1913 s->s3->server_opaque_prf_input =
1914 BUF_memdup(s->tlsext_opaque_prf_input,
1915 s->tlsext_opaque_prf_input_len);
1916 }
1917 if (s->s3->server_opaque_prf_input == NULL) {
1918 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1919 al = SSL_AD_INTERNAL_ERROR;
1920 goto err;
1921 }
1922 s->s3->server_opaque_prf_input_len =
1923 s->tlsext_opaque_prf_input_len;
1924 }
1925 }
1926
1927 if (r == 2 && s->s3->server_opaque_prf_input == NULL) {
1928 /*
1929 * The callback wants to enforce use of the extension, but we
1930 * can't do that with the client opaque PRF input; abort the
1931 * handshake.
1932 */
1933 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1934 al = SSL_AD_HANDSHAKE_FAILURE;
1935 }
1936 }
1937
1938 err:
1939 # endif
1940 switch (ret) {
1941 case SSL_TLSEXT_ERR_ALERT_FATAL:
1942 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1943 return -1;
1944
1945 case SSL_TLSEXT_ERR_ALERT_WARNING:
1946 ssl3_send_alert(s, SSL3_AL_WARNING, al);
1947 return 1;
1948
1949 case SSL_TLSEXT_ERR_NOACK:
1950 s->servername_done = 0;
1951 default:
1952 return 1;
1953 }
1954 }
1955
ssl_check_clienthello_tlsext_late(SSL * s)1956 int ssl_check_clienthello_tlsext_late(SSL *s)
1957 {
1958 int ret = SSL_TLSEXT_ERR_OK;
1959 int al;
1960
1961 /*
1962 * If status request then ask callback what to do. Note: this must be
1963 * called after servername callbacks in case the certificate has
1964 * changed, and must be called after the cipher has been chosen because
1965 * this may influence which certificate is sent
1966 */
1967 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb) {
1968 int r;
1969 CERT_PKEY *certpkey;
1970 certpkey = ssl_get_server_send_pkey(s);
1971 /* If no certificate can't return certificate status */
1972 if (certpkey == NULL) {
1973 s->tlsext_status_expected = 0;
1974 return 1;
1975 }
1976 /*
1977 * Set current certificate to one we will use so SSL_get_certificate
1978 * et al can pick it up.
1979 */
1980 s->cert->key = certpkey;
1981 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1982 switch (r) {
1983 /* We don't want to send a status request response */
1984 case SSL_TLSEXT_ERR_NOACK:
1985 s->tlsext_status_expected = 0;
1986 break;
1987 /* status request response should be sent */
1988 case SSL_TLSEXT_ERR_OK:
1989 if (s->tlsext_ocsp_resp)
1990 s->tlsext_status_expected = 1;
1991 else
1992 s->tlsext_status_expected = 0;
1993 break;
1994 /* something bad happened */
1995 case SSL_TLSEXT_ERR_ALERT_FATAL:
1996 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1997 al = SSL_AD_INTERNAL_ERROR;
1998 goto err;
1999 }
2000 } else
2001 s->tlsext_status_expected = 0;
2002
2003 err:
2004 switch (ret) {
2005 case SSL_TLSEXT_ERR_ALERT_FATAL:
2006 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2007 return -1;
2008
2009 case SSL_TLSEXT_ERR_ALERT_WARNING:
2010 ssl3_send_alert(s, SSL3_AL_WARNING, al);
2011 return 1;
2012
2013 default:
2014 return 1;
2015 }
2016 }
2017
ssl_check_serverhello_tlsext(SSL * s)2018 int ssl_check_serverhello_tlsext(SSL *s)
2019 {
2020 int ret = SSL_TLSEXT_ERR_NOACK;
2021 int al = SSL_AD_UNRECOGNIZED_NAME;
2022
2023 # ifndef OPENSSL_NO_EC
2024 /*
2025 * If we are client and using an elliptic curve cryptography cipher
2026 * suite, then if server returns an EC point formats lists extension it
2027 * must contain uncompressed.
2028 */
2029 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2030 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2031 if ((s->tlsext_ecpointformatlist != NULL)
2032 && (s->tlsext_ecpointformatlist_length > 0)
2033 && (s->session->tlsext_ecpointformatlist != NULL)
2034 && (s->session->tlsext_ecpointformatlist_length > 0)
2035 && ((alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe))
2036 || (alg_a & SSL_aECDSA))) {
2037 /* we are using an ECC cipher */
2038 size_t i;
2039 unsigned char *list;
2040 int found_uncompressed = 0;
2041 list = s->session->tlsext_ecpointformatlist;
2042 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++) {
2043 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed) {
2044 found_uncompressed = 1;
2045 break;
2046 }
2047 }
2048 if (!found_uncompressed) {
2049 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,
2050 SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
2051 return -1;
2052 }
2053 }
2054 ret = SSL_TLSEXT_ERR_OK;
2055 # endif /* OPENSSL_NO_EC */
2056
2057 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2058 ret =
2059 s->ctx->tlsext_servername_callback(s, &al,
2060 s->ctx->tlsext_servername_arg);
2061 else if (s->initial_ctx != NULL
2062 && s->initial_ctx->tlsext_servername_callback != 0)
2063 ret =
2064 s->initial_ctx->tlsext_servername_callback(s, &al,
2065 s->
2066 initial_ctx->tlsext_servername_arg);
2067
2068 # ifdef TLSEXT_TYPE_opaque_prf_input
2069 if (s->s3->server_opaque_prf_input_len > 0) {
2070 /*
2071 * This case may indicate that we, as a client, want to insist on
2072 * using opaque PRF inputs. So first verify that we really have a
2073 * value from the server too.
2074 */
2075
2076 if (s->s3->server_opaque_prf_input == NULL) {
2077 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2078 al = SSL_AD_HANDSHAKE_FAILURE;
2079 }
2080
2081 /*
2082 * Anytime the server *has* sent an opaque PRF input, we need to
2083 * check that we have a client opaque PRF input of the same size.
2084 */
2085 if (s->s3->client_opaque_prf_input == NULL ||
2086 s->s3->client_opaque_prf_input_len !=
2087 s->s3->server_opaque_prf_input_len) {
2088 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2089 al = SSL_AD_ILLEGAL_PARAMETER;
2090 }
2091 }
2092 # endif
2093
2094 OPENSSL_free(s->tlsext_ocsp_resp);
2095 s->tlsext_ocsp_resp = NULL;
2096 s->tlsext_ocsp_resplen = -1;
2097 /*
2098 * If we've requested certificate status and we wont get one tell the
2099 * callback
2100 */
2101 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
2102 && !(s->hit) && s->ctx && s->ctx->tlsext_status_cb) {
2103 int r;
2104 /*
2105 * Call callback with resp == NULL and resplen == -1 so callback
2106 * knows there is no response
2107 */
2108 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2109 if (r == 0) {
2110 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2111 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2112 }
2113 if (r < 0) {
2114 al = SSL_AD_INTERNAL_ERROR;
2115 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2116 }
2117 }
2118
2119 switch (ret) {
2120 case SSL_TLSEXT_ERR_ALERT_FATAL:
2121 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2122 return -1;
2123
2124 case SSL_TLSEXT_ERR_ALERT_WARNING:
2125 ssl3_send_alert(s, SSL3_AL_WARNING, al);
2126 return 1;
2127
2128 case SSL_TLSEXT_ERR_NOACK:
2129 s->servername_done = 0;
2130 default:
2131 return 1;
2132 }
2133 }
2134
2135 /*-
2136 * Since the server cache lookup is done early on in the processing of the
2137 * ClientHello, and other operations depend on the result, we need to handle
2138 * any TLS session ticket extension at the same time.
2139 *
2140 * session_id: points at the session ID in the ClientHello. This code will
2141 * read past the end of this in order to parse out the session ticket
2142 * extension, if any.
2143 * len: the length of the session ID.
2144 * limit: a pointer to the first byte after the ClientHello.
2145 * ret: (output) on return, if a ticket was decrypted, then this is set to
2146 * point to the resulting session.
2147 *
2148 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
2149 * ciphersuite, in which case we have no use for session tickets and one will
2150 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
2151 *
2152 * Returns:
2153 * -1: fatal error, either from parsing or decrypting the ticket.
2154 * 0: no ticket was found (or was ignored, based on settings).
2155 * 1: a zero length extension was found, indicating that the client supports
2156 * session tickets but doesn't currently have one to offer.
2157 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
2158 * couldn't be decrypted because of a non-fatal error.
2159 * 3: a ticket was successfully decrypted and *ret was set.
2160 *
2161 * Side effects:
2162 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
2163 * a new session ticket to the client because the client indicated support
2164 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
2165 * a session ticket or we couldn't use the one it gave us, or if
2166 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
2167 * Otherwise, s->tlsext_ticket_expected is set to 0.
2168 */
tls1_process_ticket(SSL * s,unsigned char * session_id,int len,const unsigned char * limit,SSL_SESSION ** ret)2169 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
2170 const unsigned char *limit, SSL_SESSION **ret)
2171 {
2172 /* Point after session ID in client hello */
2173 const unsigned char *p = session_id + len;
2174 unsigned short i;
2175
2176 *ret = NULL;
2177 s->tlsext_ticket_expected = 0;
2178
2179 /*
2180 * If tickets disabled behave as if no ticket present to permit stateful
2181 * resumption.
2182 */
2183 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
2184 return 0;
2185 if ((s->version <= SSL3_VERSION) || !limit)
2186 return 0;
2187 if (p >= limit)
2188 return -1;
2189 /* Skip past DTLS cookie */
2190 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER) {
2191 i = *(p++);
2192
2193 if (limit - p <= i)
2194 return -1;
2195
2196 p += i;
2197 }
2198 /* Skip past cipher list */
2199 n2s(p, i);
2200 if (limit - p <= i)
2201 return -1;
2202 p += i;
2203
2204 /* Skip past compression algorithm list */
2205 i = *(p++);
2206 if (limit - p < i)
2207 return -1;
2208 p += i;
2209
2210 /* Now at start of extensions */
2211 if (limit - p <= 2)
2212 return 0;
2213 n2s(p, i);
2214 while (limit - p >= 4) {
2215 unsigned short type, size;
2216 n2s(p, type);
2217 n2s(p, size);
2218 if (limit - p < size)
2219 return 0;
2220 if (type == TLSEXT_TYPE_session_ticket) {
2221 int r;
2222 if (size == 0) {
2223 /*
2224 * The client will accept a ticket but doesn't currently have
2225 * one.
2226 */
2227 s->tlsext_ticket_expected = 1;
2228 return 1;
2229 }
2230 if (s->tls_session_secret_cb) {
2231 /*
2232 * Indicate that the ticket couldn't be decrypted rather than
2233 * generating the session from ticket now, trigger
2234 * abbreviated handshake based on external mechanism to
2235 * calculate the master secret later.
2236 */
2237 return 2;
2238 }
2239 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
2240 switch (r) {
2241 case 2: /* ticket couldn't be decrypted */
2242 s->tlsext_ticket_expected = 1;
2243 return 2;
2244 case 3: /* ticket was decrypted */
2245 return r;
2246 case 4: /* ticket decrypted but need to renew */
2247 s->tlsext_ticket_expected = 1;
2248 return 3;
2249 default: /* fatal error */
2250 return -1;
2251 }
2252 }
2253 p += size;
2254 }
2255 return 0;
2256 }
2257
2258 /*-
2259 * tls_decrypt_ticket attempts to decrypt a session ticket.
2260 *
2261 * etick: points to the body of the session ticket extension.
2262 * eticklen: the length of the session tickets extenion.
2263 * sess_id: points at the session ID.
2264 * sesslen: the length of the session ID.
2265 * psess: (output) on return, if a ticket was decrypted, then this is set to
2266 * point to the resulting session.
2267 *
2268 * Returns:
2269 * -1: fatal error, either from parsing or decrypting the ticket.
2270 * 2: the ticket couldn't be decrypted.
2271 * 3: a ticket was successfully decrypted and *psess was set.
2272 * 4: same as 3, but the ticket needs to be renewed.
2273 */
tls_decrypt_ticket(SSL * s,const unsigned char * etick,int eticklen,const unsigned char * sess_id,int sesslen,SSL_SESSION ** psess)2274 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick,
2275 int eticklen, const unsigned char *sess_id,
2276 int sesslen, SSL_SESSION **psess)
2277 {
2278 SSL_SESSION *sess;
2279 unsigned char *sdec;
2280 const unsigned char *p;
2281 int slen, mlen, renew_ticket = 0;
2282 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
2283 HMAC_CTX hctx;
2284 EVP_CIPHER_CTX ctx;
2285 SSL_CTX *tctx = s->initial_ctx;
2286
2287 /* Initialize session ticket encryption and HMAC contexts */
2288 HMAC_CTX_init(&hctx);
2289 EVP_CIPHER_CTX_init(&ctx);
2290 if (tctx->tlsext_ticket_key_cb) {
2291 unsigned char *nctick = (unsigned char *)etick;
2292 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
2293 &ctx, &hctx, 0);
2294 if (rv < 0)
2295 return -1;
2296 if (rv == 0)
2297 return 2;
2298 if (rv == 2)
2299 renew_ticket = 1;
2300 } else {
2301 /* Check key name matches */
2302 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
2303 return 2;
2304 if (HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2305 tlsext_tick_md(), NULL) <= 0
2306 || EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2307 tctx->tlsext_tick_aes_key,
2308 etick + 16) <= 0) {
2309 goto err;
2310 }
2311 }
2312 /*
2313 * Attempt to process session ticket, first conduct sanity and integrity
2314 * checks on ticket.
2315 */
2316 mlen = HMAC_size(&hctx);
2317 if (mlen < 0) {
2318 goto err;
2319 }
2320 /* Sanity check ticket length: must exceed keyname + IV + HMAC */
2321 if (eticklen <= 16 + EVP_CIPHER_CTX_iv_length(&ctx) + mlen) {
2322 HMAC_CTX_cleanup(&hctx);
2323 EVP_CIPHER_CTX_cleanup(&ctx);
2324 return 2;
2325 }
2326
2327 eticklen -= mlen;
2328 /* Check HMAC of encrypted ticket */
2329 if (HMAC_Update(&hctx, etick, eticklen) <= 0
2330 || HMAC_Final(&hctx, tick_hmac, NULL) <= 0) {
2331 goto err;
2332 }
2333 HMAC_CTX_cleanup(&hctx);
2334 if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen)) {
2335 EVP_CIPHER_CTX_cleanup(&ctx);
2336 return 2;
2337 }
2338 /* Attempt to decrypt session data */
2339 /* Move p after IV to start of encrypted ticket, update length */
2340 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2341 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2342 sdec = OPENSSL_malloc(eticklen);
2343 if (sdec == NULL
2344 || EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen) <= 0) {
2345 EVP_CIPHER_CTX_cleanup(&ctx);
2346 OPENSSL_free(sdec);
2347 return -1;
2348 }
2349 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0) {
2350 EVP_CIPHER_CTX_cleanup(&ctx);
2351 OPENSSL_free(sdec);
2352 return 2;
2353 }
2354 slen += mlen;
2355 EVP_CIPHER_CTX_cleanup(&ctx);
2356 p = sdec;
2357
2358 sess = d2i_SSL_SESSION(NULL, &p, slen);
2359 OPENSSL_free(sdec);
2360 if (sess) {
2361 /*
2362 * The session ID, if non-empty, is used by some clients to detect
2363 * that the ticket has been accepted. So we copy it to the session
2364 * structure. If it is empty set length to zero as required by
2365 * standard.
2366 */
2367 if (sesslen)
2368 memcpy(sess->session_id, sess_id, sesslen);
2369 sess->session_id_length = sesslen;
2370 *psess = sess;
2371 if (renew_ticket)
2372 return 4;
2373 else
2374 return 3;
2375 }
2376 ERR_clear_error();
2377 /*
2378 * For session parse failure, indicate that we need to send a new ticket.
2379 */
2380 return 2;
2381 err:
2382 EVP_CIPHER_CTX_cleanup(&ctx);
2383 HMAC_CTX_cleanup(&hctx);
2384 return -1;
2385 }
2386
2387 /* Tables to translate from NIDs to TLS v1.2 ids */
2388
2389 typedef struct {
2390 int nid;
2391 int id;
2392 } tls12_lookup;
2393
2394 static tls12_lookup tls12_md[] = {
2395 # ifndef OPENSSL_NO_MD5
2396 {NID_md5, TLSEXT_hash_md5},
2397 # endif
2398 # ifndef OPENSSL_NO_SHA
2399 {NID_sha1, TLSEXT_hash_sha1},
2400 # endif
2401 # ifndef OPENSSL_NO_SHA256
2402 {NID_sha224, TLSEXT_hash_sha224},
2403 {NID_sha256, TLSEXT_hash_sha256},
2404 # endif
2405 # ifndef OPENSSL_NO_SHA512
2406 {NID_sha384, TLSEXT_hash_sha384},
2407 {NID_sha512, TLSEXT_hash_sha512}
2408 # endif
2409 };
2410
2411 static tls12_lookup tls12_sig[] = {
2412 # ifndef OPENSSL_NO_RSA
2413 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
2414 # endif
2415 # ifndef OPENSSL_NO_DSA
2416 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
2417 # endif
2418 # ifndef OPENSSL_NO_ECDSA
2419 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
2420 # endif
2421 };
2422
tls12_find_id(int nid,tls12_lookup * table,size_t tlen)2423 static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
2424 {
2425 size_t i;
2426 for (i = 0; i < tlen; i++) {
2427 if (table[i].nid == nid)
2428 return table[i].id;
2429 }
2430 return -1;
2431 }
2432
2433 # if 0
2434 static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
2435 {
2436 size_t i;
2437 for (i = 0; i < tlen; i++) {
2438 if (table[i].id == id)
2439 return table[i].nid;
2440 }
2441 return -1;
2442 }
2443 # endif
2444
tls12_get_sigandhash(unsigned char * p,const EVP_PKEY * pk,const EVP_MD * md)2445 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk,
2446 const EVP_MD *md)
2447 {
2448 int sig_id, md_id;
2449 if (!md)
2450 return 0;
2451 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
2452 sizeof(tls12_md) / sizeof(tls12_lookup));
2453 if (md_id == -1)
2454 return 0;
2455 sig_id = tls12_get_sigid(pk);
2456 if (sig_id == -1)
2457 return 0;
2458 p[0] = (unsigned char)md_id;
2459 p[1] = (unsigned char)sig_id;
2460 return 1;
2461 }
2462
tls12_get_sigid(const EVP_PKEY * pk)2463 int tls12_get_sigid(const EVP_PKEY *pk)
2464 {
2465 return tls12_find_id(pk->type, tls12_sig,
2466 sizeof(tls12_sig) / sizeof(tls12_lookup));
2467 }
2468
tls12_get_hash(unsigned char hash_alg)2469 const EVP_MD *tls12_get_hash(unsigned char hash_alg)
2470 {
2471 switch (hash_alg) {
2472 # ifndef OPENSSL_NO_SHA
2473 case TLSEXT_hash_sha1:
2474 return EVP_sha1();
2475 # endif
2476 # ifndef OPENSSL_NO_SHA256
2477 case TLSEXT_hash_sha224:
2478 return EVP_sha224();
2479
2480 case TLSEXT_hash_sha256:
2481 return EVP_sha256();
2482 # endif
2483 # ifndef OPENSSL_NO_SHA512
2484 case TLSEXT_hash_sha384:
2485 return EVP_sha384();
2486
2487 case TLSEXT_hash_sha512:
2488 return EVP_sha512();
2489 # endif
2490 default:
2491 return NULL;
2492
2493 }
2494 }
2495
2496 /* Set preferred digest for each key type */
2497
tls1_process_sigalgs(SSL * s,const unsigned char * data,int dsize)2498 int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
2499 {
2500 int i, idx;
2501 const EVP_MD *md;
2502 CERT *c = s->cert;
2503 /* Extension ignored for TLS versions below 1.2 */
2504 if (TLS1_get_version(s) < TLS1_2_VERSION)
2505 return 1;
2506 /* Should never happen */
2507 if (!c)
2508 return 0;
2509
2510 c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
2511 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
2512 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
2513 c->pkeys[SSL_PKEY_ECC].digest = NULL;
2514
2515 for (i = 0; i < dsize; i += 2) {
2516 unsigned char hash_alg = data[i], sig_alg = data[i + 1];
2517
2518 switch (sig_alg) {
2519 # ifndef OPENSSL_NO_RSA
2520 case TLSEXT_signature_rsa:
2521 idx = SSL_PKEY_RSA_SIGN;
2522 break;
2523 # endif
2524 # ifndef OPENSSL_NO_DSA
2525 case TLSEXT_signature_dsa:
2526 idx = SSL_PKEY_DSA_SIGN;
2527 break;
2528 # endif
2529 # ifndef OPENSSL_NO_ECDSA
2530 case TLSEXT_signature_ecdsa:
2531 idx = SSL_PKEY_ECC;
2532 break;
2533 # endif
2534 default:
2535 continue;
2536 }
2537
2538 if (c->pkeys[idx].digest == NULL) {
2539 md = tls12_get_hash(hash_alg);
2540 if (md) {
2541 c->pkeys[idx].digest = md;
2542 if (idx == SSL_PKEY_RSA_SIGN)
2543 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
2544 }
2545 }
2546
2547 }
2548
2549 /*
2550 * Set any remaining keys to default values. NOTE: if alg is not
2551 * supported it stays as NULL.
2552 */
2553 # ifndef OPENSSL_NO_DSA
2554 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
2555 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
2556 # endif
2557 # ifndef OPENSSL_NO_RSA
2558 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest) {
2559 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
2560 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
2561 }
2562 # endif
2563 # ifndef OPENSSL_NO_ECDSA
2564 if (!c->pkeys[SSL_PKEY_ECC].digest)
2565 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
2566 # endif
2567 return 1;
2568 }
2569
2570 #endif
2571
2572 #ifndef OPENSSL_NO_HEARTBEATS
tls1_process_heartbeat(SSL * s)2573 int tls1_process_heartbeat(SSL *s)
2574 {
2575 unsigned char *p = &s->s3->rrec.data[0], *pl;
2576 unsigned short hbtype;
2577 unsigned int payload;
2578 unsigned int padding = 16; /* Use minimum padding */
2579
2580 if (s->msg_callback)
2581 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
2582 &s->s3->rrec.data[0], s->s3->rrec.length,
2583 s, s->msg_callback_arg);
2584
2585 /* Read type and payload length first */
2586 if (1 + 2 + 16 > s->s3->rrec.length)
2587 return 0; /* silently discard */
2588 hbtype = *p++;
2589 n2s(p, payload);
2590 if (1 + 2 + payload + 16 > s->s3->rrec.length)
2591 return 0; /* silently discard per RFC 6520 sec. 4 */
2592 pl = p;
2593
2594 if (hbtype == TLS1_HB_REQUEST) {
2595 unsigned char *buffer, *bp;
2596 int r;
2597
2598 /*
2599 * Allocate memory for the response, size is 1 bytes message type,
2600 * plus 2 bytes payload length, plus payload, plus padding
2601 */
2602 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
2603 if (buffer == NULL)
2604 return -1;
2605 bp = buffer;
2606
2607 /* Enter response type, length and copy payload */
2608 *bp++ = TLS1_HB_RESPONSE;
2609 s2n(payload, bp);
2610 memcpy(bp, pl, payload);
2611 bp += payload;
2612 /* Random padding */
2613 if (RAND_bytes(bp, padding) <= 0) {
2614 OPENSSL_free(buffer);
2615 return -1;
2616 }
2617
2618 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer,
2619 3 + payload + padding);
2620
2621 if (r >= 0 && s->msg_callback)
2622 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
2623 buffer, 3 + payload + padding,
2624 s, s->msg_callback_arg);
2625
2626 OPENSSL_free(buffer);
2627
2628 if (r < 0)
2629 return r;
2630 } else if (hbtype == TLS1_HB_RESPONSE) {
2631 unsigned int seq;
2632
2633 /*
2634 * We only send sequence numbers (2 bytes unsigned int), and 16
2635 * random bytes, so we just try to read the sequence number
2636 */
2637 n2s(pl, seq);
2638
2639 if (payload == 18 && seq == s->tlsext_hb_seq) {
2640 s->tlsext_hb_seq++;
2641 s->tlsext_hb_pending = 0;
2642 }
2643 }
2644
2645 return 0;
2646 }
2647
tls1_heartbeat(SSL * s)2648 int tls1_heartbeat(SSL *s)
2649 {
2650 unsigned char *buf, *p;
2651 int ret = -1;
2652 unsigned int payload = 18; /* Sequence number + random bytes */
2653 unsigned int padding = 16; /* Use minimum padding */
2654
2655 /* Only send if peer supports and accepts HB requests... */
2656 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
2657 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS) {
2658 SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
2659 return -1;
2660 }
2661
2662 /* ...and there is none in flight yet... */
2663 if (s->tlsext_hb_pending) {
2664 SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_TLS_HEARTBEAT_PENDING);
2665 return -1;
2666 }
2667
2668 /* ...and no handshake in progress. */
2669 if (SSL_in_init(s) || s->in_handshake) {
2670 SSLerr(SSL_F_TLS1_HEARTBEAT, SSL_R_UNEXPECTED_MESSAGE);
2671 return -1;
2672 }
2673
2674 /*
2675 * Check if padding is too long, payload and padding must not exceed 2^14
2676 * - 3 = 16381 bytes in total.
2677 */
2678 OPENSSL_assert(payload + padding <= 16381);
2679
2680 /*-
2681 * Create HeartBeat message, we just use a sequence number
2682 * as payload to distuingish different messages and add
2683 * some random stuff.
2684 * - Message Type, 1 byte
2685 * - Payload Length, 2 bytes (unsigned int)
2686 * - Payload, the sequence number (2 bytes uint)
2687 * - Payload, random bytes (16 bytes uint)
2688 * - Padding
2689 */
2690 buf = OPENSSL_malloc(1 + 2 + payload + padding);
2691 p = buf;
2692 /* Message Type */
2693 *p++ = TLS1_HB_REQUEST;
2694 /* Payload length (18 bytes here) */
2695 s2n(payload, p);
2696 /* Sequence number */
2697 s2n(s->tlsext_hb_seq, p);
2698 /* 16 random bytes */
2699 if (RAND_bytes(p, 16) <= 0) {
2700 SSLerr(SSL_F_TLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR);
2701 goto err;
2702 }
2703 p += 16;
2704 /* Random padding */
2705 if (RAND_bytes(p, padding) <= 0) {
2706 SSLerr(SSL_F_TLS1_HEARTBEAT, ERR_R_INTERNAL_ERROR);
2707 goto err;
2708 }
2709
2710 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
2711 if (ret >= 0) {
2712 if (s->msg_callback)
2713 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
2714 buf, 3 + payload + padding,
2715 s, s->msg_callback_arg);
2716
2717 s->tlsext_hb_pending = 1;
2718 }
2719
2720 err:
2721 OPENSSL_free(buf);
2722
2723 return ret;
2724 }
2725 #endif
2726