Import OpenSSL-1.0.0b.
[dragonfly.git] / crypto / openssl / ssl / t1_lib.c
CommitLineData
56276539
SS
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 */
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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 */
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111
112#include <stdio.h>
113#include <openssl/objects.h>
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114#include <openssl/evp.h>
115#include <openssl/hmac.h>
2e6ca3d0 116#include <openssl/ocsp.h>
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117#include "ssl_locl.h"
118
e40c9513 119const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
56276539 120
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PA
121#ifndef OPENSSL_NO_TLSEXT
122static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
123 const unsigned char *sess_id, int sesslen,
124 SSL_SESSION **psess);
125#endif
126
5bd86ce5 127SSL3_ENC_METHOD TLSv1_enc_data={
56276539
SS
128 tls1_enc,
129 tls1_mac,
130 tls1_setup_key_block,
131 tls1_generate_master_secret,
132 tls1_change_cipher_state,
133 tls1_final_finish_mac,
134 TLS1_FINISH_MAC_LENGTH,
135 tls1_cert_verify_mac,
136 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
137 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
138 tls1_alert_code,
139 };
140
5bd86ce5 141long tls1_default_timeout(void)
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SS
142 {
143 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
144 * is way too long for http, the cache would over fill */
145 return(60*60*2);
146 }
147
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148int tls1_new(SSL *s)
149 {
150 if (!ssl3_new(s)) return(0);
151 s->method->ssl_clear(s);
152 return(1);
153 }
154
155void tls1_free(SSL *s)
156 {
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PA
157#ifndef OPENSSL_NO_TLSEXT
158 if (s->tlsext_session_ticket)
159 {
160 OPENSSL_free(s->tlsext_session_ticket);
161 }
162#endif /* OPENSSL_NO_TLSEXT */
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163 ssl3_free(s);
164 }
165
166void tls1_clear(SSL *s)
167 {
168 ssl3_clear(s);
169 s->version=TLS1_VERSION;
170 }
171
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PA
172#ifndef OPENSSL_NO_EC
173static int nid_list[] =
174 {
175 NID_sect163k1, /* sect163k1 (1) */
176 NID_sect163r1, /* sect163r1 (2) */
177 NID_sect163r2, /* sect163r2 (3) */
178 NID_sect193r1, /* sect193r1 (4) */
179 NID_sect193r2, /* sect193r2 (5) */
180 NID_sect233k1, /* sect233k1 (6) */
181 NID_sect233r1, /* sect233r1 (7) */
182 NID_sect239k1, /* sect239k1 (8) */
183 NID_sect283k1, /* sect283k1 (9) */
184 NID_sect283r1, /* sect283r1 (10) */
185 NID_sect409k1, /* sect409k1 (11) */
186 NID_sect409r1, /* sect409r1 (12) */
187 NID_sect571k1, /* sect571k1 (13) */
188 NID_sect571r1, /* sect571r1 (14) */
189 NID_secp160k1, /* secp160k1 (15) */
190 NID_secp160r1, /* secp160r1 (16) */
191 NID_secp160r2, /* secp160r2 (17) */
192 NID_secp192k1, /* secp192k1 (18) */
193 NID_X9_62_prime192v1, /* secp192r1 (19) */
194 NID_secp224k1, /* secp224k1 (20) */
195 NID_secp224r1, /* secp224r1 (21) */
196 NID_secp256k1, /* secp256k1 (22) */
197 NID_X9_62_prime256v1, /* secp256r1 (23) */
198 NID_secp384r1, /* secp384r1 (24) */
199 NID_secp521r1 /* secp521r1 (25) */
200 };
201
202int tls1_ec_curve_id2nid(int curve_id)
56276539 203 {
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PA
204 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
205 if ((curve_id < 1) || ((unsigned int)curve_id >
206 sizeof(nid_list)/sizeof(nid_list[0])))
207 return 0;
208 return nid_list[curve_id-1];
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SS
209 }
210
919b01cc 211int tls1_ec_nid2curve_id(int nid)
56276539 212 {
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213 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
214 switch (nid)
215 {
216 case NID_sect163k1: /* sect163k1 (1) */
217 return 1;
218 case NID_sect163r1: /* sect163r1 (2) */
219 return 2;
220 case NID_sect163r2: /* sect163r2 (3) */
221 return 3;
222 case NID_sect193r1: /* sect193r1 (4) */
223 return 4;
224 case NID_sect193r2: /* sect193r2 (5) */
225 return 5;
226 case NID_sect233k1: /* sect233k1 (6) */
227 return 6;
228 case NID_sect233r1: /* sect233r1 (7) */
229 return 7;
230 case NID_sect239k1: /* sect239k1 (8) */
231 return 8;
232 case NID_sect283k1: /* sect283k1 (9) */
233 return 9;
234 case NID_sect283r1: /* sect283r1 (10) */
235 return 10;
236 case NID_sect409k1: /* sect409k1 (11) */
237 return 11;
238 case NID_sect409r1: /* sect409r1 (12) */
239 return 12;
240 case NID_sect571k1: /* sect571k1 (13) */
241 return 13;
242 case NID_sect571r1: /* sect571r1 (14) */
243 return 14;
244 case NID_secp160k1: /* secp160k1 (15) */
245 return 15;
246 case NID_secp160r1: /* secp160r1 (16) */
247 return 16;
248 case NID_secp160r2: /* secp160r2 (17) */
249 return 17;
250 case NID_secp192k1: /* secp192k1 (18) */
251 return 18;
252 case NID_X9_62_prime192v1: /* secp192r1 (19) */
253 return 19;
254 case NID_secp224k1: /* secp224k1 (20) */
255 return 20;
256 case NID_secp224r1: /* secp224r1 (21) */
257 return 21;
258 case NID_secp256k1: /* secp256k1 (22) */
259 return 22;
260 case NID_X9_62_prime256v1: /* secp256r1 (23) */
261 return 23;
262 case NID_secp384r1: /* secp384r1 (24) */
263 return 24;
264 case NID_secp521r1: /* secp521r1 (25) */
265 return 25;
266 default:
267 return 0;
268 }
56276539 269 }
919b01cc 270#endif /* OPENSSL_NO_EC */
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271
272#ifndef OPENSSL_NO_TLSEXT
273unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
274 {
275 int extdatalen=0;
276 unsigned char *ret = p;
277
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PA
278 /* don't add extensions for SSLv3 unless doing secure renegotiation */
279 if (s->client_version == SSL3_VERSION
280 && !s->s3->send_connection_binding)
281 return p;
282
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283 ret+=2;
284
285 if (ret>=limit) return NULL; /* this really never occurs, but ... */
286
287 if (s->tlsext_hostname != NULL)
288 {
289 /* Add TLS extension servername to the Client Hello message */
290 unsigned long size_str;
291 long lenmax;
292
293 /* check for enough space.
294 4 for the servername type and entension length
295 2 for servernamelist length
296 1 for the hostname type
297 2 for hostname length
298 + hostname length
299 */
300
301 if ((lenmax = limit - ret - 9) < 0
919b01cc 302 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
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PA
303 return NULL;
304
305 /* extension type and length */
306 s2n(TLSEXT_TYPE_server_name,ret);
307 s2n(size_str+5,ret);
308
309 /* length of servername list */
310 s2n(size_str+3,ret);
311
312 /* hostname type, length and hostname */
313 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
314 s2n(size_str,ret);
315 memcpy(ret, s->tlsext_hostname, size_str);
316 ret+=size_str;
e6bc27f5 317 }
919b01cc 318
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PA
319 /* Add RI if renegotiating */
320 if (s->new_session)
321 {
322 int el;
323
324 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
325 {
326 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
327 return NULL;
328 }
329
330 if((limit - p - 4 - el) < 0) return NULL;
331
332 s2n(TLSEXT_TYPE_renegotiate,ret);
333 s2n(el,ret);
334
335 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
336 {
337 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
338 return NULL;
339 }
340
341 ret += el;
342 }
343
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PA
344#ifndef OPENSSL_NO_EC
345 if (s->tlsext_ecpointformatlist != NULL &&
346 s->version != DTLS1_VERSION)
347 {
348 /* Add TLS extension ECPointFormats to the ClientHello message */
349 long lenmax;
350
351 if ((lenmax = limit - ret - 5) < 0) return NULL;
352 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
353 if (s->tlsext_ecpointformatlist_length > 255)
354 {
355 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
356 return NULL;
357 }
358
359 s2n(TLSEXT_TYPE_ec_point_formats,ret);
360 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
361 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
362 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
363 ret+=s->tlsext_ecpointformatlist_length;
364 }
365 if (s->tlsext_ellipticcurvelist != NULL &&
366 s->version != DTLS1_VERSION)
367 {
368 /* Add TLS extension EllipticCurves to the ClientHello message */
369 long lenmax;
370
371 if ((lenmax = limit - ret - 6) < 0) return NULL;
372 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
373 if (s->tlsext_ellipticcurvelist_length > 65532)
374 {
375 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
376 return NULL;
377 }
378
379 s2n(TLSEXT_TYPE_elliptic_curves,ret);
380 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
381
382 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
383 * elliptic_curve_list, but the examples use two bytes.
384 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
385 * resolves this to two bytes.
386 */
387 s2n(s->tlsext_ellipticcurvelist_length, ret);
388 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
389 ret+=s->tlsext_ellipticcurvelist_length;
390 }
391#endif /* OPENSSL_NO_EC */
392
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PA
393 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
394 {
395 int ticklen;
5f042374 396 if (!s->new_session && s->session && s->session->tlsext_tick)
e6bc27f5 397 ticklen = s->session->tlsext_ticklen;
919b01cc
PA
398 else if (s->session && s->tlsext_session_ticket &&
399 s->tlsext_session_ticket->data)
400 {
401 ticklen = s->tlsext_session_ticket->length;
402 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
403 if (!s->session->tlsext_tick)
404 return NULL;
405 memcpy(s->session->tlsext_tick,
406 s->tlsext_session_ticket->data,
407 ticklen);
408 s->session->tlsext_ticklen = ticklen;
409 }
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PA
410 else
411 ticklen = 0;
919b01cc
PA
412 if (ticklen == 0 && s->tlsext_session_ticket &&
413 s->tlsext_session_ticket->data == NULL)
414 goto skip_ext;
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415 /* Check for enough room 2 for extension type, 2 for len
416 * rest for ticket
417 */
919b01cc 418 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
e6bc27f5
PA
419 s2n(TLSEXT_TYPE_session_ticket,ret);
420 s2n(ticklen,ret);
421 if (ticklen)
422 {
423 memcpy(ret, s->session->tlsext_tick, ticklen);
424 ret += ticklen;
425 }
426 }
919b01cc
PA
427 skip_ext:
428
429#ifdef TLSEXT_TYPE_opaque_prf_input
430 if (s->s3->client_opaque_prf_input != NULL &&
431 s->version != DTLS1_VERSION)
432 {
433 size_t col = s->s3->client_opaque_prf_input_len;
434
435 if ((long)(limit - ret - 6 - col < 0))
436 return NULL;
437 if (col > 0xFFFD) /* can't happen */
438 return NULL;
439
440 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
441 s2n(col + 2, ret);
442 s2n(col, ret);
443 memcpy(ret, s->s3->client_opaque_prf_input, col);
444 ret += col;
445 }
446#endif
e6bc27f5 447
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448 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
449 s->version != DTLS1_VERSION)
2e6ca3d0
PA
450 {
451 int i;
452 long extlen, idlen, itmp;
453 OCSP_RESPID *id;
454
455 idlen = 0;
456 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
457 {
458 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
459 itmp = i2d_OCSP_RESPID(id, NULL);
460 if (itmp <= 0)
461 return NULL;
462 idlen += itmp + 2;
463 }
464
465 if (s->tlsext_ocsp_exts)
466 {
467 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
468 if (extlen < 0)
469 return NULL;
470 }
471 else
472 extlen = 0;
473
474 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
475 s2n(TLSEXT_TYPE_status_request, ret);
476 if (extlen + idlen > 0xFFF0)
477 return NULL;
478 s2n(extlen + idlen + 5, ret);
479 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
480 s2n(idlen, ret);
481 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
482 {
483 /* save position of id len */
484 unsigned char *q = ret;
485 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
486 /* skip over id len */
487 ret += 2;
488 itmp = i2d_OCSP_RESPID(id, &ret);
489 /* write id len */
490 s2n(itmp, q);
491 }
492 s2n(extlen, ret);
493 if (extlen > 0)
494 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
495 }
496
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PA
497 if ((extdatalen = ret-p-2)== 0)
498 return p;
499
500 s2n(extdatalen,p);
501 return ret;
502 }
503
504unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
505 {
506 int extdatalen=0;
507 unsigned char *ret = p;
508
5f042374
PA
509 /* don't add extensions for SSLv3, unless doing secure renegotiation */
510 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
511 return p;
512
e6bc27f5
PA
513 ret+=2;
514 if (ret>=limit) return NULL; /* this really never occurs, but ... */
515
516 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
517 {
919b01cc 518 if ((long)(limit - ret - 4) < 0) return NULL;
e6bc27f5
PA
519
520 s2n(TLSEXT_TYPE_server_name,ret);
521 s2n(0,ret);
522 }
5f042374
PA
523
524 if(s->s3->send_connection_binding)
525 {
526 int el;
527
528 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
529 {
530 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
531 return NULL;
532 }
533
534 if((limit - p - 4 - el) < 0) return NULL;
535
536 s2n(TLSEXT_TYPE_renegotiate,ret);
537 s2n(el,ret);
538
539 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
540 {
541 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
542 return NULL;
543 }
544
545 ret += el;
546 }
919b01cc
PA
547
548#ifndef OPENSSL_NO_EC
549 if (s->tlsext_ecpointformatlist != NULL &&
550 s->version != DTLS1_VERSION)
551 {
552 /* Add TLS extension ECPointFormats to the ServerHello message */
553 long lenmax;
554
555 if ((lenmax = limit - ret - 5) < 0) return NULL;
556 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
557 if (s->tlsext_ecpointformatlist_length > 255)
558 {
559 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
560 return NULL;
561 }
562
563 s2n(TLSEXT_TYPE_ec_point_formats,ret);
564 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
565 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
566 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
567 ret+=s->tlsext_ecpointformatlist_length;
568
569 }
570 /* Currently the server should not respond with a SupportedCurves extension */
571#endif /* OPENSSL_NO_EC */
572
e6bc27f5
PA
573 if (s->tlsext_ticket_expected
574 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
575 {
919b01cc 576 if ((long)(limit - ret - 4) < 0) return NULL;
e6bc27f5
PA
577 s2n(TLSEXT_TYPE_session_ticket,ret);
578 s2n(0,ret);
579 }
2e6ca3d0
PA
580
581 if (s->tlsext_status_expected)
582 {
583 if ((long)(limit - ret - 4) < 0) return NULL;
584 s2n(TLSEXT_TYPE_status_request,ret);
585 s2n(0,ret);
586 }
587
919b01cc
PA
588#ifdef TLSEXT_TYPE_opaque_prf_input
589 if (s->s3->server_opaque_prf_input != NULL &&
590 s->version != DTLS1_VERSION)
591 {
592 size_t sol = s->s3->server_opaque_prf_input_len;
593
594 if ((long)(limit - ret - 6 - sol) < 0)
595 return NULL;
596 if (sol > 0xFFFD) /* can't happen */
597 return NULL;
598
599 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
600 s2n(sol + 2, ret);
601 s2n(sol, ret);
602 memcpy(ret, s->s3->server_opaque_prf_input, sol);
603 ret += sol;
604 }
605#endif
606 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
607 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
608 { const unsigned char cryptopro_ext[36] = {
609 0xfd, 0xe8, /*65000*/
610 0x00, 0x20, /*32 bytes length*/
611 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
612 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
613 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
614 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
615 if (limit-ret<36) return NULL;
616 memcpy(ret,cryptopro_ext,36);
617 ret+=36;
618
619 }
620
e6bc27f5
PA
621 if ((extdatalen = ret-p-2)== 0)
622 return p;
623
624 s2n(extdatalen,p);
625 return ret;
626 }
627
628int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
629 {
630 unsigned short type;
631 unsigned short size;
632 unsigned short len;
633 unsigned char *data = *p;
5f042374
PA
634 int renegotiate_seen = 0;
635
e6bc27f5 636 s->servername_done = 0;
2e6ca3d0 637 s->tlsext_status_type = -1;
e6bc27f5
PA
638
639 if (data >= (d+n-2))
5f042374 640 goto ri_check;
e6bc27f5
PA
641 n2s(data,len);
642
643 if (data > (d+n-len))
5f042374 644 goto ri_check;
e6bc27f5
PA
645
646 while (data <= (d+n-4))
647 {
648 n2s(data,type);
649 n2s(data,size);
650
651 if (data+size > (d+n))
5f042374 652 goto ri_check;
919b01cc
PA
653#if 0
654 fprintf(stderr,"Received extension type %d size %d\n",type,size);
655#endif
e6bc27f5
PA
656 if (s->tlsext_debug_cb)
657 s->tlsext_debug_cb(s, 0, type, data, size,
658 s->tlsext_debug_arg);
659/* The servername extension is treated as follows:
660
661 - Only the hostname type is supported with a maximum length of 255.
662 - The servername is rejected if too long or if it contains zeros,
663 in which case an fatal alert is generated.
664 - The servername field is maintained together with the session cache.
665 - When a session is resumed, the servername call back invoked in order
666 to allow the application to position itself to the right context.
667 - The servername is acknowledged if it is new for a session or when
668 it is identical to a previously used for the same session.
669 Applications can control the behaviour. They can at any time
670 set a 'desirable' servername for a new SSL object. This can be the
671 case for example with HTTPS when a Host: header field is received and
672 a renegotiation is requested. In this case, a possible servername
673 presented in the new client hello is only acknowledged if it matches
674 the value of the Host: field.
675 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
676 if they provide for changing an explicit servername context for the session,
677 i.e. when the session has been established with a servername extension.
678 - On session reconnect, the servername extension may be absent.
679
680*/
681
682 if (type == TLSEXT_TYPE_server_name)
683 {
684 unsigned char *sdata;
685 int servname_type;
686 int dsize;
687
688 if (size < 2)
689 {
690 *al = SSL_AD_DECODE_ERROR;
691 return 0;
692 }
693 n2s(data,dsize);
694 size -= 2;
695 if (dsize > size )
696 {
697 *al = SSL_AD_DECODE_ERROR;
698 return 0;
699 }
700
701 sdata = data;
702 while (dsize > 3)
703 {
704 servname_type = *(sdata++);
705 n2s(sdata,len);
706 dsize -= 3;
707
708 if (len > dsize)
709 {
710 *al = SSL_AD_DECODE_ERROR;
711 return 0;
712 }
713 if (s->servername_done == 0)
714 switch (servname_type)
715 {
716 case TLSEXT_NAMETYPE_host_name:
9f1859dd 717 if (!s->hit)
e6bc27f5 718 {
9f1859dd
PA
719 if(s->session->tlsext_hostname)
720 {
721 *al = SSL_AD_DECODE_ERROR;
722 return 0;
723 }
724 if (len > TLSEXT_MAXLEN_host_name)
e6bc27f5
PA
725 {
726 *al = TLS1_AD_UNRECOGNIZED_NAME;
727 return 0;
728 }
9f1859dd
PA
729 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
730 {
731 *al = TLS1_AD_INTERNAL_ERROR;
732 return 0;
733 }
e6bc27f5
PA
734 memcpy(s->session->tlsext_hostname, sdata, len);
735 s->session->tlsext_hostname[len]='\0';
736 if (strlen(s->session->tlsext_hostname) != len) {
737 OPENSSL_free(s->session->tlsext_hostname);
2e6ca3d0 738 s->session->tlsext_hostname = NULL;
e6bc27f5
PA
739 *al = TLS1_AD_UNRECOGNIZED_NAME;
740 return 0;
741 }
742 s->servername_done = 1;
743
744 }
745 else
9f1859dd
PA
746 s->servername_done = s->session->tlsext_hostname
747 && strlen(s->session->tlsext_hostname) == len
e6bc27f5
PA
748 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
749
750 break;
751
752 default:
753 break;
754 }
755
756 dsize -= len;
757 }
758 if (dsize != 0)
759 {
760 *al = SSL_AD_DECODE_ERROR;
761 return 0;
762 }
763
764 }
919b01cc
PA
765
766#ifndef OPENSSL_NO_EC
767 else if (type == TLSEXT_TYPE_ec_point_formats &&
768 s->version != DTLS1_VERSION)
769 {
770 unsigned char *sdata = data;
771 int ecpointformatlist_length = *(sdata++);
772
773 if (ecpointformatlist_length != size - 1)
774 {
775 *al = TLS1_AD_DECODE_ERROR;
776 return 0;
777 }
9f1859dd 778 if (!s->hit)
919b01cc 779 {
9f1859dd
PA
780 if(s->session->tlsext_ecpointformatlist)
781 {
782 *al = TLS1_AD_DECODE_ERROR;
783 return 0;
784 }
785 s->session->tlsext_ecpointformatlist_length = 0;
786 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
787 {
788 *al = TLS1_AD_INTERNAL_ERROR;
789 return 0;
790 }
791 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
792 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
919b01cc 793 }
919b01cc
PA
794#if 0
795 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
796 sdata = s->session->tlsext_ecpointformatlist;
797 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
798 fprintf(stderr,"%i ",*(sdata++));
799 fprintf(stderr,"\n");
800#endif
801 }
802 else if (type == TLSEXT_TYPE_elliptic_curves &&
803 s->version != DTLS1_VERSION)
804 {
805 unsigned char *sdata = data;
806 int ellipticcurvelist_length = (*(sdata++) << 8);
807 ellipticcurvelist_length += (*(sdata++));
808
809 if (ellipticcurvelist_length != size - 2)
810 {
811 *al = TLS1_AD_DECODE_ERROR;
812 return 0;
813 }
9f1859dd 814 if (!s->hit)
919b01cc 815 {
9f1859dd
PA
816 if(s->session->tlsext_ellipticcurvelist)
817 {
818 *al = TLS1_AD_DECODE_ERROR;
819 return 0;
820 }
821 s->session->tlsext_ellipticcurvelist_length = 0;
822 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
823 {
824 *al = TLS1_AD_INTERNAL_ERROR;
825 return 0;
826 }
827 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
828 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
919b01cc 829 }
919b01cc
PA
830#if 0
831 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
832 sdata = s->session->tlsext_ellipticcurvelist;
833 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
834 fprintf(stderr,"%i ",*(sdata++));
835 fprintf(stderr,"\n");
836#endif
837 }
838#endif /* OPENSSL_NO_EC */
839#ifdef TLSEXT_TYPE_opaque_prf_input
840 else if (type == TLSEXT_TYPE_opaque_prf_input &&
841 s->version != DTLS1_VERSION)
842 {
843 unsigned char *sdata = data;
844
845 if (size < 2)
846 {
847 *al = SSL_AD_DECODE_ERROR;
848 return 0;
849 }
850 n2s(sdata, s->s3->client_opaque_prf_input_len);
851 if (s->s3->client_opaque_prf_input_len != size - 2)
852 {
853 *al = SSL_AD_DECODE_ERROR;
854 return 0;
855 }
856
857 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
858 OPENSSL_free(s->s3->client_opaque_prf_input);
859 if (s->s3->client_opaque_prf_input_len == 0)
860 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
861 else
862 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
863 if (s->s3->client_opaque_prf_input == NULL)
864 {
865 *al = TLS1_AD_INTERNAL_ERROR;
866 return 0;
867 }
868 }
869#endif
870 else if (type == TLSEXT_TYPE_session_ticket)
871 {
872 if (s->tls_session_ticket_ext_cb &&
873 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
874 {
875 *al = TLS1_AD_INTERNAL_ERROR;
876 return 0;
877 }
878 }
5f042374
PA
879 else if (type == TLSEXT_TYPE_renegotiate)
880 {
881 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
882 return 0;
883 renegotiate_seen = 1;
884 }
885 else if (type == TLSEXT_TYPE_status_request &&
886 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
2e6ca3d0
PA
887 {
888
889 if (size < 5)
890 {
891 *al = SSL_AD_DECODE_ERROR;
892 return 0;
893 }
894
895 s->tlsext_status_type = *data++;
896 size--;
897 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
898 {
899 const unsigned char *sdata;
900 int dsize;
901 /* Read in responder_id_list */
902 n2s(data,dsize);
903 size -= 2;
904 if (dsize > size )
905 {
906 *al = SSL_AD_DECODE_ERROR;
907 return 0;
908 }
909 while (dsize > 0)
910 {
911 OCSP_RESPID *id;
912 int idsize;
913 if (dsize < 4)
914 {
915 *al = SSL_AD_DECODE_ERROR;
916 return 0;
917 }
918 n2s(data, idsize);
919 dsize -= 2 + idsize;
920 if (dsize < 0)
921 {
922 *al = SSL_AD_DECODE_ERROR;
923 return 0;
924 }
925 sdata = data;
926 data += idsize;
927 id = d2i_OCSP_RESPID(NULL,
928 &sdata, idsize);
929 if (!id)
930 {
931 *al = SSL_AD_DECODE_ERROR;
932 return 0;
933 }
934 if (data != sdata)
935 {
936 OCSP_RESPID_free(id);
937 *al = SSL_AD_DECODE_ERROR;
938 return 0;
939 }
940 if (!s->tlsext_ocsp_ids
941 && !(s->tlsext_ocsp_ids =
942 sk_OCSP_RESPID_new_null()))
943 {
944 OCSP_RESPID_free(id);
945 *al = SSL_AD_INTERNAL_ERROR;
946 return 0;
947 }
948 if (!sk_OCSP_RESPID_push(
949 s->tlsext_ocsp_ids, id))
950 {
951 OCSP_RESPID_free(id);
952 *al = SSL_AD_INTERNAL_ERROR;
953 return 0;
954 }
955 }
956
957 /* Read in request_extensions */
958 n2s(data,dsize);
959 size -= 2;
960 if (dsize > size)
961 {
962 *al = SSL_AD_DECODE_ERROR;
963 return 0;
964 }
965 sdata = data;
966 if (dsize > 0)
967 {
968 s->tlsext_ocsp_exts =
969 d2i_X509_EXTENSIONS(NULL,
970 &sdata, dsize);
971 if (!s->tlsext_ocsp_exts
972 || (data + dsize != sdata))
973 {
974 *al = SSL_AD_DECODE_ERROR;
975 return 0;
976 }
977 }
978 }
979 /* We don't know what to do with any other type
980 * so ignore it.
981 */
982 else
983 s->tlsext_status_type = -1;
984 }
5f042374 985
e6bc27f5 986 /* session ticket processed earlier */
919b01cc 987 data+=size;
e6bc27f5 988 }
919b01cc 989
e6bc27f5 990 *p = data;
5f042374
PA
991
992 ri_check:
993
994 /* Need RI if renegotiating */
995
996 if (!renegotiate_seen && s->new_session &&
997 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
998 {
999 *al = SSL_AD_HANDSHAKE_FAILURE;
1000 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,
1001 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1002 return 0;
1003 }
1004
e6bc27f5
PA
1005 return 1;
1006 }
1007
1008int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1009 {
9f1859dd 1010 unsigned short length;
e6bc27f5
PA
1011 unsigned short type;
1012 unsigned short size;
e6bc27f5 1013 unsigned char *data = *p;
e6bc27f5 1014 int tlsext_servername = 0;
5f042374 1015 int renegotiate_seen = 0;
e6bc27f5
PA
1016
1017 if (data >= (d+n-2))
5f042374 1018 goto ri_check;
e6bc27f5 1019
9f1859dd
PA
1020 n2s(data,length);
1021 if (data+length != d+n)
1022 {
1023 *al = SSL_AD_DECODE_ERROR;
1024 return 0;
1025 }
e6bc27f5
PA
1026
1027 while(data <= (d+n-4))
1028 {
1029 n2s(data,type);
1030 n2s(data,size);
1031
1032 if (data+size > (d+n))
5f042374 1033 goto ri_check;
e6bc27f5
PA
1034
1035 if (s->tlsext_debug_cb)
1036 s->tlsext_debug_cb(s, 1, type, data, size,
1037 s->tlsext_debug_arg);
1038
1039 if (type == TLSEXT_TYPE_server_name)
1040 {
1041 if (s->tlsext_hostname == NULL || size > 0)
1042 {
1043 *al = TLS1_AD_UNRECOGNIZED_NAME;
1044 return 0;
1045 }
1046 tlsext_servername = 1;
1047 }
919b01cc
PA
1048
1049#ifndef OPENSSL_NO_EC
1050 else if (type == TLSEXT_TYPE_ec_point_formats &&
1051 s->version != DTLS1_VERSION)
1052 {
1053 unsigned char *sdata = data;
1054 int ecpointformatlist_length = *(sdata++);
1055
1056 if (ecpointformatlist_length != size - 1)
1057 {
1058 *al = TLS1_AD_DECODE_ERROR;
1059 return 0;
1060 }
1061 s->session->tlsext_ecpointformatlist_length = 0;
1062 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1063 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1064 {
1065 *al = TLS1_AD_INTERNAL_ERROR;
1066 return 0;
1067 }
1068 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1069 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1070#if 0
1071 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1072 sdata = s->session->tlsext_ecpointformatlist;
1073 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1074 fprintf(stderr,"%i ",*(sdata++));
1075 fprintf(stderr,"\n");
1076#endif
1077 }
1078#endif /* OPENSSL_NO_EC */
1079
e6bc27f5
PA
1080 else if (type == TLSEXT_TYPE_session_ticket)
1081 {
919b01cc
PA
1082 if (s->tls_session_ticket_ext_cb &&
1083 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1084 {
1085 *al = TLS1_AD_INTERNAL_ERROR;
1086 return 0;
1087 }
e6bc27f5
PA
1088 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1089 || (size > 0))
1090 {
1091 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1092 return 0;
1093 }
1094 s->tlsext_ticket_expected = 1;
1095 }
919b01cc
PA
1096#ifdef TLSEXT_TYPE_opaque_prf_input
1097 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1098 s->version != DTLS1_VERSION)
1099 {
1100 unsigned char *sdata = data;
1101
1102 if (size < 2)
1103 {
1104 *al = SSL_AD_DECODE_ERROR;
1105 return 0;
1106 }
1107 n2s(sdata, s->s3->server_opaque_prf_input_len);
1108 if (s->s3->server_opaque_prf_input_len != size - 2)
1109 {
1110 *al = SSL_AD_DECODE_ERROR;
1111 return 0;
1112 }
1113
1114 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1115 OPENSSL_free(s->s3->server_opaque_prf_input);
1116 if (s->s3->server_opaque_prf_input_len == 0)
1117 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1118 else
1119 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
1120
1121 if (s->s3->server_opaque_prf_input == NULL)
1122 {
1123 *al = TLS1_AD_INTERNAL_ERROR;
1124 return 0;
1125 }
1126 }
1127#endif
5f042374
PA
1128 else if (type == TLSEXT_TYPE_status_request &&
1129 s->version != DTLS1_VERSION)
2e6ca3d0
PA
1130 {
1131 /* MUST be empty and only sent if we've requested
1132 * a status request message.
1133 */
1134 if ((s->tlsext_status_type == -1) || (size > 0))
1135 {
1136 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1137 return 0;
1138 }
1139 /* Set flag to expect CertificateStatus message */
1140 s->tlsext_status_expected = 1;
1141 }
5f042374
PA
1142 else if (type == TLSEXT_TYPE_renegotiate)
1143 {
1144 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
1145 return 0;
1146 renegotiate_seen = 1;
1147 }
e6bc27f5
PA
1148 data+=size;
1149 }
1150
1151 if (data != d+n)
1152 {
1153 *al = SSL_AD_DECODE_ERROR;
1154 return 0;
1155 }
1156
1157 if (!s->hit && tlsext_servername == 1)
1158 {
1159 if (s->tlsext_hostname)
1160 {
1161 if (s->session->tlsext_hostname == NULL)
1162 {
1163 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
1164 if (!s->session->tlsext_hostname)
1165 {
1166 *al = SSL_AD_UNRECOGNIZED_NAME;
1167 return 0;
1168 }
1169 }
1170 else
1171 {
1172 *al = SSL_AD_DECODE_ERROR;
1173 return 0;
1174 }
1175 }
1176 }
1177
1178 *p = data;
5f042374
PA
1179
1180 ri_check:
1181
1182 /* Determine if we need to see RI. Strictly speaking if we want to
1183 * avoid an attack we should *always* see RI even on initial server
1184 * hello because the client doesn't see any renegotiation during an
1185 * attack. However this would mean we could not connect to any server
1186 * which doesn't support RI so for the immediate future tolerate RI
1187 * absence on initial connect only.
1188 */
1189 if (!renegotiate_seen
1190 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
1191 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1192 {
1193 *al = SSL_AD_HANDSHAKE_FAILURE;
1194 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,
1195 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1196 return 0;
1197 }
1198
e6bc27f5
PA
1199 return 1;
1200 }
1201
919b01cc
PA
1202
1203int ssl_prepare_clienthello_tlsext(SSL *s)
1204 {
1205#ifndef OPENSSL_NO_EC
1206 /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
1207 * and elliptic curves we support.
1208 */
1209 int using_ecc = 0;
1210 int i;
1211 unsigned char *j;
1212 unsigned long alg_k, alg_a;
1213 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1214
1215 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
1216 {
1217 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1218
1219 alg_k = c->algorithm_mkey;
1220 alg_a = c->algorithm_auth;
1221 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
1222 {
1223 using_ecc = 1;
1224 break;
1225 }
1226 }
1227 using_ecc = using_ecc && (s->version == TLS1_VERSION);
1228 if (using_ecc)
1229 {
1230 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1231 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1232 {
1233 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1234 return -1;
1235 }
1236 s->tlsext_ecpointformatlist_length = 3;
1237 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1238 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1239 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1240
1241 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
1242 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
1243 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
1244 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
1245 {
1246 s->tlsext_ellipticcurvelist_length = 0;
1247 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1248 return -1;
1249 }
1250 for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <=
1251 sizeof(nid_list)/sizeof(nid_list[0]); i++)
1252 s2n(i,j);
1253 }
1254#endif /* OPENSSL_NO_EC */
1255
1256#ifdef TLSEXT_TYPE_opaque_prf_input
1257 {
1258 int r = 1;
1259
1260 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1261 {
1262 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1263 if (!r)
1264 return -1;
1265 }
1266
1267 if (s->tlsext_opaque_prf_input != NULL)
1268 {
1269 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1270 OPENSSL_free(s->s3->client_opaque_prf_input);
1271
1272 if (s->tlsext_opaque_prf_input_len == 0)
1273 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1274 else
1275 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1276 if (s->s3->client_opaque_prf_input == NULL)
1277 {
1278 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1279 return -1;
1280 }
1281 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1282 }
1283
1284 if (r == 2)
1285 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
1286 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1287 }
1288#endif
1289
1290 return 1;
1291 }
1292
1293int ssl_prepare_serverhello_tlsext(SSL *s)
1294 {
1295#ifndef OPENSSL_NO_EC
1296 /* If we are server and using an ECC cipher suite, send the point formats we support
1297 * if the client sent us an ECPointsFormat extension. Note that the server is not
1298 * supposed to send an EllipticCurves extension.
1299 */
1300
1301 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1302 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1303 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
1304 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1305
1306 if (using_ecc)
1307 {
1308 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1309 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1310 {
1311 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1312 return -1;
1313 }
1314 s->tlsext_ecpointformatlist_length = 3;
1315 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1316 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1317 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1318 }
1319#endif /* OPENSSL_NO_EC */
1320
1321 return 1;
1322 }
1323
e6bc27f5
PA
1324int ssl_check_clienthello_tlsext(SSL *s)
1325 {
1326 int ret=SSL_TLSEXT_ERR_NOACK;
1327 int al = SSL_AD_UNRECOGNIZED_NAME;
1328
919b01cc
PA
1329#ifndef OPENSSL_NO_EC
1330 /* The handling of the ECPointFormats extension is done elsewhere, namely in
1331 * ssl3_choose_cipher in s3_lib.c.
1332 */
1333 /* The handling of the EllipticCurves extension is done elsewhere, namely in
1334 * ssl3_choose_cipher in s3_lib.c.
1335 */
1336#endif
1337
e6bc27f5
PA
1338 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1339 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1340 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1341 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1342
2e6ca3d0
PA
1343 /* If status request then ask callback what to do.
1344 * Note: this must be called after servername callbacks in case
1345 * the certificate has changed.
1346 */
919b01cc 1347 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
2e6ca3d0
PA
1348 {
1349 int r;
1350 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1351 switch (r)
1352 {
1353 /* We don't want to send a status request response */
1354 case SSL_TLSEXT_ERR_NOACK:
1355 s->tlsext_status_expected = 0;
1356 break;
1357 /* status request response should be sent */
1358 case SSL_TLSEXT_ERR_OK:
1359 if (s->tlsext_ocsp_resp)
1360 s->tlsext_status_expected = 1;
1361 else
1362 s->tlsext_status_expected = 0;
1363 break;
1364 /* something bad happened */
1365 case SSL_TLSEXT_ERR_ALERT_FATAL:
1366 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1367 al = SSL_AD_INTERNAL_ERROR;
1368 goto err;
1369 }
1370 }
1371 else
1372 s->tlsext_status_expected = 0;
919b01cc
PA
1373
1374#ifdef TLSEXT_TYPE_opaque_prf_input
1375 {
1376 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
1377 * but we might be sending an alert in response to the client hello,
1378 * so this has to happen here in ssl_check_clienthello_tlsext(). */
1379
1380 int r = 1;
1381
1382 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1383 {
1384 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1385 if (!r)
1386 {
1387 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1388 al = SSL_AD_INTERNAL_ERROR;
1389 goto err;
1390 }
1391 }
1392
1393 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1394 OPENSSL_free(s->s3->server_opaque_prf_input);
1395 s->s3->server_opaque_prf_input = NULL;
1396
1397 if (s->tlsext_opaque_prf_input != NULL)
1398 {
1399 if (s->s3->client_opaque_prf_input != NULL &&
1400 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
1401 {
1402 /* can only use this extension if we have a server opaque PRF input
1403 * of the same length as the client opaque PRF input! */
1404
1405 if (s->tlsext_opaque_prf_input_len == 0)
1406 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1407 else
1408 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1409 if (s->s3->server_opaque_prf_input == NULL)
1410 {
1411 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1412 al = SSL_AD_INTERNAL_ERROR;
1413 goto err;
1414 }
1415 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1416 }
1417 }
1418
1419 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
1420 {
1421 /* The callback wants to enforce use of the extension,
1422 * but we can't do that with the client opaque PRF input;
1423 * abort the handshake.
1424 */
1425 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1426 al = SSL_AD_HANDSHAKE_FAILURE;
1427 }
1428 }
1429
1430#endif
1431 err:
e6bc27f5
PA
1432 switch (ret)
1433 {
1434 case SSL_TLSEXT_ERR_ALERT_FATAL:
1435 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1436 return -1;
1437
1438 case SSL_TLSEXT_ERR_ALERT_WARNING:
1439 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1440 return 1;
1441
1442 case SSL_TLSEXT_ERR_NOACK:
1443 s->servername_done=0;
1444 default:
1445 return 1;
1446 }
1447 }
1448
1449int ssl_check_serverhello_tlsext(SSL *s)
1450 {
1451 int ret=SSL_TLSEXT_ERR_NOACK;
1452 int al = SSL_AD_UNRECOGNIZED_NAME;
1453
919b01cc
PA
1454#ifndef OPENSSL_NO_EC
1455 /* If we are client and using an elliptic curve cryptography cipher suite, then server
1456 * must return a an EC point formats lists containing uncompressed.
1457 */
1458 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1459 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1460 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
1461 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
1462 {
1463 /* we are using an ECC cipher */
1464 size_t i;
1465 unsigned char *list;
1466 int found_uncompressed = 0;
1467 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
1468 {
1469 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1470 return -1;
1471 }
1472 list = s->session->tlsext_ecpointformatlist;
1473 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1474 {
1475 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
1476 {
1477 found_uncompressed = 1;
1478 break;
1479 }
1480 }
1481 if (!found_uncompressed)
1482 {
1483 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1484 return -1;
1485 }
1486 }
1487 ret = SSL_TLSEXT_ERR_OK;
1488#endif /* OPENSSL_NO_EC */
1489
e6bc27f5
PA
1490 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1491 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1492 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1493 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1494
919b01cc
PA
1495#ifdef TLSEXT_TYPE_opaque_prf_input
1496 if (s->s3->server_opaque_prf_input_len > 0)
1497 {
1498 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
1499 * So first verify that we really have a value from the server too. */
1500
1501 if (s->s3->server_opaque_prf_input == NULL)
1502 {
1503 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1504 al = SSL_AD_HANDSHAKE_FAILURE;
1505 }
1506
1507 /* Anytime the server *has* sent an opaque PRF input, we need to check
1508 * that we have a client opaque PRF input of the same size. */
1509 if (s->s3->client_opaque_prf_input == NULL ||
1510 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
1511 {
1512 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1513 al = SSL_AD_ILLEGAL_PARAMETER;
1514 }
1515 }
1516#endif
1517
2e6ca3d0
PA
1518 /* If we've requested certificate status and we wont get one
1519 * tell the callback
1520 */
1521 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
919b01cc 1522 && s->ctx && s->ctx->tlsext_status_cb)
2e6ca3d0
PA
1523 {
1524 int r;
1525 /* Set resp to NULL, resplen to -1 so callback knows
1526 * there is no response.
1527 */
1528 if (s->tlsext_ocsp_resp)
1529 {
1530 OPENSSL_free(s->tlsext_ocsp_resp);
1531 s->tlsext_ocsp_resp = NULL;
1532 }
1533 s->tlsext_ocsp_resplen = -1;
1534 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1535 if (r == 0)
1536 {
1537 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1538 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1539 }
1540 if (r < 0)
1541 {
1542 al = SSL_AD_INTERNAL_ERROR;
1543 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1544 }
1545 }
1546
e6bc27f5
PA
1547 switch (ret)
1548 {
1549 case SSL_TLSEXT_ERR_ALERT_FATAL:
1550 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1551 return -1;
1552
1553 case SSL_TLSEXT_ERR_ALERT_WARNING:
1554 ssl3_send_alert(s,SSL3_AL_WARNING,al);
1555 return 1;
1556
1557 case SSL_TLSEXT_ERR_NOACK:
1558 s->servername_done=0;
1559 default:
1560 return 1;
1561 }
1562 }
1563
1564/* Since the server cache lookup is done early on in the processing of client
1565 * hello and other operations depend on the result we need to handle any TLS
1566 * session ticket extension at the same time.
1567 */
1568
1569int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
1570 const unsigned char *limit, SSL_SESSION **ret)
1571 {
1572 /* Point after session ID in client hello */
1573 const unsigned char *p = session_id + len;
1574 unsigned short i;
683caddb
PA
1575
1576 /* If tickets disabled behave as if no ticket present
1577 * to permit stateful resumption.
1578 */
1579 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1580 return 1;
1581
e6bc27f5
PA
1582 if ((s->version <= SSL3_VERSION) || !limit)
1583 return 1;
1584 if (p >= limit)
1585 return -1;
5f042374
PA
1586 /* Skip past DTLS cookie */
1587 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1588 {
1589 i = *(p++);
1590 p+= i;
1591 if (p >= limit)
1592 return -1;
1593 }
e6bc27f5
PA
1594 /* Skip past cipher list */
1595 n2s(p, i);
1596 p+= i;
1597 if (p >= limit)
1598 return -1;
1599 /* Skip past compression algorithm list */
1600 i = *(p++);
1601 p += i;
1602 if (p > limit)
1603 return -1;
1604 /* Now at start of extensions */
1605 if ((p + 2) >= limit)
1606 return 1;
1607 n2s(p, i);
1608 while ((p + 4) <= limit)
1609 {
1610 unsigned short type, size;
1611 n2s(p, type);
1612 n2s(p, size);
1613 if (p + size > limit)
1614 return 1;
1615 if (type == TLSEXT_TYPE_session_ticket)
1616 {
919b01cc
PA
1617 /* If tickets disabled indicate cache miss which will
1618 * trigger a full handshake
1619 */
1620 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1621 return 1;
683caddb 1622 /* If zero length note client will accept a ticket
e6bc27f5
PA
1623 * and indicate cache miss to trigger full handshake
1624 */
1625 if (size == 0)
1626 {
1627 s->tlsext_ticket_expected = 1;
1628 return 0; /* Cache miss */
1629 }
919b01cc
PA
1630 if (s->tls_session_secret_cb)
1631 {
1632 /* Indicate cache miss here and instead of
1633 * generating the session from ticket now,
1634 * trigger abbreviated handshake based on
1635 * external mechanism to calculate the master
1636 * secret later. */
1637 return 0;
1638 }
e6bc27f5
PA
1639 return tls_decrypt_ticket(s, p, size, session_id, len,
1640 ret);
1641 }
1642 p += size;
1643 }
1644 return 1;
1645 }
1646
1647static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
1648 const unsigned char *sess_id, int sesslen,
1649 SSL_SESSION **psess)
1650 {
1651 SSL_SESSION *sess;
1652 unsigned char *sdec;
1653 const unsigned char *p;
2e6ca3d0 1654 int slen, mlen, renew_ticket = 0;
e6bc27f5
PA
1655 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1656 HMAC_CTX hctx;
1657 EVP_CIPHER_CTX ctx;
5f042374 1658 SSL_CTX *tctx = s->initial_ctx;
2e6ca3d0
PA
1659 /* Need at least keyname + iv + some encrypted data */
1660 if (eticklen < 48)
1661 goto tickerr;
1662 /* Initialize session ticket encryption and HMAC contexts */
1663 HMAC_CTX_init(&hctx);
1664 EVP_CIPHER_CTX_init(&ctx);
5f042374 1665 if (tctx->tlsext_ticket_key_cb)
2e6ca3d0
PA
1666 {
1667 unsigned char *nctick = (unsigned char *)etick;
5f042374 1668 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
2e6ca3d0
PA
1669 &ctx, &hctx, 0);
1670 if (rv < 0)
1671 return -1;
1672 if (rv == 0)
1673 goto tickerr;
1674 if (rv == 2)
1675 renew_ticket = 1;
1676 }
1677 else
1678 {
1679 /* Check key name matches */
5f042374 1680 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
2e6ca3d0 1681 goto tickerr;
5f042374 1682 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2e6ca3d0
PA
1683 tlsext_tick_md(), NULL);
1684 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
5f042374 1685 tctx->tlsext_tick_aes_key, etick + 16);
2e6ca3d0 1686 }
e6bc27f5
PA
1687 /* Attempt to process session ticket, first conduct sanity and
1688 * integrity checks on ticket.
1689 */
2e6ca3d0 1690 mlen = HMAC_size(&hctx);
919b01cc
PA
1691 if (mlen < 0)
1692 {
1693 EVP_CIPHER_CTX_cleanup(&ctx);
1694 return -1;
1695 }
e6bc27f5 1696 eticklen -= mlen;
e6bc27f5 1697 /* Check HMAC of encrypted ticket */
e6bc27f5
PA
1698 HMAC_Update(&hctx, etick, eticklen);
1699 HMAC_Final(&hctx, tick_hmac, NULL);
1700 HMAC_CTX_cleanup(&hctx);
1701 if (memcmp(tick_hmac, etick + eticklen, mlen))
1702 goto tickerr;
e6bc27f5 1703 /* Attempt to decrypt session data */
e6bc27f5 1704 /* Move p after IV to start of encrypted ticket, update length */
2e6ca3d0
PA
1705 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1706 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
e6bc27f5
PA
1707 sdec = OPENSSL_malloc(eticklen);
1708 if (!sdec)
1709 {
1710 EVP_CIPHER_CTX_cleanup(&ctx);
1711 return -1;
1712 }
1713 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
1714 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
1715 goto tickerr;
1716 slen += mlen;
1717 EVP_CIPHER_CTX_cleanup(&ctx);
1718 p = sdec;
1719
1720 sess = d2i_SSL_SESSION(NULL, &p, slen);
1721 OPENSSL_free(sdec);
1722 if (sess)
1723 {
1724 /* The session ID if non-empty is used by some clients to
1725 * detect that the ticket has been accepted. So we copy it to
1726 * the session structure. If it is empty set length to zero
1727 * as required by standard.
1728 */
1729 if (sesslen)
1730 memcpy(sess->session_id, sess_id, sesslen);
1731 sess->session_id_length = sesslen;
1732 *psess = sess;
2e6ca3d0 1733 s->tlsext_ticket_expected = renew_ticket;
e6bc27f5
PA
1734 return 1;
1735 }
1736 /* If session decrypt failure indicate a cache miss and set state to
1737 * send a new ticket
1738 */
1739 tickerr:
1740 s->tlsext_ticket_expected = 1;
1741 return 0;
1742 }
1743
1744#endif