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[thirdparty/openssl.git] / ssl / t1_lib.c
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58964a49
RE		 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 */
f1fd4544 58/* ====================================================================
52b8dad8 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
f1fd4544
BM		 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 */
58964a49
RE		 111
112#include <stdio.h>
ec577822 113#include <openssl/objects.h>
6434abbf
DSH		 114#include <openssl/evp.h>
115#include <openssl/hmac.h>
67c8e7f4 116#include <openssl/ocsp.h>
4817504d 117#include <openssl/rand.h>
58964a49
RE		 118#include "ssl_locl.h"
119
42182852 120const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
58964a49 121
367eb1f1 122#ifndef OPENSSL_NO_TLSEXT
6434abbf
DSH		 123static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
124 const unsigned char *sess_id, int sesslen,
125 SSL_SESSION **psess);
09e4e4b9
DSH		 126static int ssl_check_clienthello_tlsext(SSL *s);
127int ssl_check_serverhello_tlsext(SSL *s);
367eb1f1 128#endif
6434abbf 129
f3b656b2 130SSL3_ENC_METHOD TLSv1_enc_data={
58964a49
RE		 131 tls1_enc,
132 tls1_mac,
133 tls1_setup_key_block,
134 tls1_generate_master_secret,
135 tls1_change_cipher_state,
136 tls1_final_finish_mac,
137 TLS1_FINISH_MAC_LENGTH,
138 tls1_cert_verify_mac,
139 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
140 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
141 tls1_alert_code,
e0af0405 142 tls1_export_keying_material,
58964a49
RE		 143 };
144
f3b656b2 145long tls1_default_timeout(void)
58964a49
RE		 146 {
147 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
148 * is way too long for http, the cache would over fill */
149 return(60*60*2);
150 }
151
6b691a5c 152int tls1_new(SSL *s)
58964a49
RE		 153 {
154 if (!ssl3_new(s)) return(0);
155 s->method->ssl_clear(s);
156 return(1);
157 }
158
6b691a5c 159void tls1_free(SSL *s)
58964a49 160 {
12bf56c0
DSH		 161#ifndef OPENSSL_NO_TLSEXT
162 if (s->tlsext_session_ticket)
163 {
164 OPENSSL_free(s->tlsext_session_ticket);
165 }
166#endif /* OPENSSL_NO_TLSEXT */
58964a49
RE		 167 ssl3_free(s);
168 }
169
6b691a5c 170void tls1_clear(SSL *s)
58964a49
RE		 171 {
172 ssl3_clear(s);
637f374a 173 s->version = s->method->version;
58964a49
RE		 174 }
175
525de5d3 176#ifndef OPENSSL_NO_EC
eda3766b 177
525de5d3
DSH		 178static int nid_list[] =
179 {
180 NID_sect163k1, /* sect163k1 (1) */
181 NID_sect163r1, /* sect163r1 (2) */
182 NID_sect163r2, /* sect163r2 (3) */
183 NID_sect193r1, /* sect193r1 (4) */
184 NID_sect193r2, /* sect193r2 (5) */
185 NID_sect233k1, /* sect233k1 (6) */
186 NID_sect233r1, /* sect233r1 (7) */
187 NID_sect239k1, /* sect239k1 (8) */
188 NID_sect283k1, /* sect283k1 (9) */
189 NID_sect283r1, /* sect283r1 (10) */
190 NID_sect409k1, /* sect409k1 (11) */
191 NID_sect409r1, /* sect409r1 (12) */
192 NID_sect571k1, /* sect571k1 (13) */
193 NID_sect571r1, /* sect571r1 (14) */
194 NID_secp160k1, /* secp160k1 (15) */
195 NID_secp160r1, /* secp160r1 (16) */
196 NID_secp160r2, /* secp160r2 (17) */
197 NID_secp192k1, /* secp192k1 (18) */
198 NID_X9_62_prime192v1, /* secp192r1 (19) */
199 NID_secp224k1, /* secp224k1 (20) */
200 NID_secp224r1, /* secp224r1 (21) */
201 NID_secp256k1, /* secp256k1 (22) */
202 NID_X9_62_prime256v1, /* secp256r1 (23) */
203 NID_secp384r1, /* secp384r1 (24) */
204 NID_secp521r1 /* secp521r1 (25) */
205 };
eda3766b 206
d0595f17
DSH		 207
208static const unsigned char ecformats_default[] =
eda3766b 209 {
d0595f17
DSH		 210 TLSEXT_ECPOINTFORMAT_uncompressed,
211 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
212 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
213 };
214
215static const unsigned char eccurves_default[] =
216 {
217 0,14, /* sect571r1 (14) */
218 0,13, /* sect571k1 (13) */
219 0,25, /* secp521r1 (25) */
220 0,11, /* sect409k1 (11) */
221 0,12, /* sect409r1 (12) */
222 0,24, /* secp384r1 (24) */
223 0,9, /* sect283k1 (9) */
224 0,10, /* sect283r1 (10) */
225 0,22, /* secp256k1 (22) */
226 0,23, /* secp256r1 (23) */
227 0,8, /* sect239k1 (8) */
228 0,6, /* sect233k1 (6) */
229 0,7, /* sect233r1 (7) */
230 0,20, /* secp224k1 (20) */
231 0,21, /* secp224r1 (21) */
232 0,4, /* sect193r1 (4) */
233 0,5, /* sect193r2 (5) */
234 0,18, /* secp192k1 (18) */
235 0,19, /* secp192r1 (19) */
236 0,1, /* sect163k1 (1) */
237 0,2, /* sect163r1 (2) */
238 0,3, /* sect163r2 (3) */
239 0,15, /* secp160k1 (15) */
240 0,16, /* secp160r1 (16) */
241 0,17, /* secp160r2 (17) */
eda3766b
DSH		 242 };
243
525de5d3
DSH		 244int tls1_ec_curve_id2nid(int curve_id)
245 {
246 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
1e26a8ba
GT		 247 if ((curve_id < 1) || ((unsigned int)curve_id >
248 sizeof(nid_list)/sizeof(nid_list[0])))
249 return 0;
525de5d3
DSH		 250 return nid_list[curve_id-1];
251 }
252
253int tls1_ec_nid2curve_id(int nid)
254 {
255 /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
256 switch (nid)
257 {
258 case NID_sect163k1: /* sect163k1 (1) */
259 return 1;
260 case NID_sect163r1: /* sect163r1 (2) */
261 return 2;
262 case NID_sect163r2: /* sect163r2 (3) */
263 return 3;
264 case NID_sect193r1: /* sect193r1 (4) */
265 return 4;
266 case NID_sect193r2: /* sect193r2 (5) */
267 return 5;
268 case NID_sect233k1: /* sect233k1 (6) */
269 return 6;
270 case NID_sect233r1: /* sect233r1 (7) */
271 return 7;
272 case NID_sect239k1: /* sect239k1 (8) */
273 return 8;
274 case NID_sect283k1: /* sect283k1 (9) */
275 return 9;
276 case NID_sect283r1: /* sect283r1 (10) */
277 return 10;
278 case NID_sect409k1: /* sect409k1 (11) */
279 return 11;
280 case NID_sect409r1: /* sect409r1 (12) */
281 return 12;
282 case NID_sect571k1: /* sect571k1 (13) */
283 return 13;
284 case NID_sect571r1: /* sect571r1 (14) */
285 return 14;
286 case NID_secp160k1: /* secp160k1 (15) */
287 return 15;
288 case NID_secp160r1: /* secp160r1 (16) */
289 return 16;
290 case NID_secp160r2: /* secp160r2 (17) */
291 return 17;
292 case NID_secp192k1: /* secp192k1 (18) */
293 return 18;
294 case NID_X9_62_prime192v1: /* secp192r1 (19) */
295 return 19;
296 case NID_secp224k1: /* secp224k1 (20) */
297 return 20;
298 case NID_secp224r1: /* secp224r1 (21) */
299 return 21;
300 case NID_secp256k1: /* secp256k1 (22) */
301 return 22;
302 case NID_X9_62_prime256v1: /* secp256r1 (23) */
303 return 23;
304 case NID_secp384r1: /* secp384r1 (24) */
305 return 24;
306 case NID_secp521r1: /* secp521r1 (25) */
307 return 25;
308 default:
309 return 0;
310 }
311 }
fd2b65ce
DSH		 312/* Get curves list, if "sess" is set return client curves otherwise
313 * preferred list
314 */
315static void tls1_get_curvelist(SSL *s, int sess,
316 const unsigned char **pcurves,
317 size_t *pcurveslen)
318 {
319 if (sess)
320 {
321 *pcurves = s->session->tlsext_ellipticcurvelist;
322 *pcurveslen = s->session->tlsext_ellipticcurvelist_length;
323 }
324 else
325 {
326 *pcurves = s->tlsext_ellipticcurvelist;
327 *pcurveslen = s->tlsext_ellipticcurvelist_length;
328 }
329 /* If not set use default: for now static structure */
330 if (!*pcurves)
331 {
332 *pcurves = eccurves_default;
333 *pcurveslen = sizeof(eccurves_default);
334 }
335 }
d0595f17 336
a4352630
DSH		 337/* Return nth shared curve. If nmatch == -1 return number of
338 * matches.
d0595f17 339 */
a4352630
DSH		 340
341int tls1_shared_curve(SSL *s, int nmatch)
d0595f17
DSH		 342 {
343 const unsigned char *pref, *supp;
344 size_t preflen, supplen, i, j;
345 int k;
a4352630
DSH		 346 /* Can't do anything on client side */
347 if (s->server == 0)
348 return -1;
349 tls1_get_curvelist(s, !!(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
350 &supp, &supplen);
351 tls1_get_curvelist(s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
352 &pref, &preflen);
353 preflen /= 2;
354 supplen /= 2;
d0595f17
DSH		 355 k = 0;
356 for (i = 0; i < preflen; i++, pref+=2)
357 {
358 const unsigned char *tsupp = supp;
359 for (j = 0; j < supplen; j++, tsupp+=2)
360 {
361 if (pref[0] == tsupp[0] && pref[1] == tsupp[1])
362 {
363 if (nmatch == k)
a4352630
DSH		 364 {
365 int id = (pref[0] << 8) | pref[1];
366 return tls1_ec_curve_id2nid(id);
367 }
d0595f17
DSH		 368 k++;
369 }
370 }
371 }
d0595f17 372 if (nmatch == -1)
a4352630
DSH		 373 return k;
374 return 0;
d0595f17
DSH		 375 }
376
377int tls1_set_curves(unsigned char **pext, size_t *pextlen,
378 int *curves, size_t ncurves)
379 {
380 unsigned char *clist, *p;
381 size_t i;
382 /* Bitmap of curves included to detect duplicates: only works
383 * while curve ids < 32
384 */
385 unsigned long dup_list = 0;
386 clist = OPENSSL_malloc(ncurves * 2);
387 if (!clist)
388 return 0;
389 for (i = 0, p = clist; i < ncurves; i++)
390 {
391 unsigned long idmask;
392 int id;
393 id = tls1_ec_nid2curve_id(curves[i]);
394 idmask = 1L << id;
395 if (!id || (dup_list & idmask))
396 {
397 OPENSSL_free(clist);
398 return 0;
399 }
400 dup_list |= idmask;
401 s2n(id, p);
402 }
403 if (*pext)
404 OPENSSL_free(*pext);
405 *pext = clist;
406 *pextlen = ncurves * 2;
407 return 1;
408 }
409
410#define MAX_CURVELIST 25
411
412typedef struct
413 {
414 size_t nidcnt;
415 int nid_arr[MAX_CURVELIST];
416 } nid_cb_st;
417
418static int nid_cb(const char *elem, int len, void *arg)
419 {
420 nid_cb_st *narg = arg;
421 size_t i;
422 int nid;
423 char etmp[20];
424 if (narg->nidcnt == MAX_CURVELIST)
425 return 0;
426 if (len > (int)(sizeof(etmp) - 1))
427 return 0;
428 memcpy(etmp, elem, len);
429 etmp[len] = 0;
430 nid = EC_curve_nist2nid(etmp);
431 if (nid == NID_undef)
432 nid = OBJ_sn2nid(etmp);
433 if (nid == NID_undef)
434 nid = OBJ_ln2nid(etmp);
435 if (nid == NID_undef)
436 return 0;
437 for (i = 0; i < narg->nidcnt; i++)
438 if (narg->nid_arr[i] == nid)
439 return 0;
440 narg->nid_arr[narg->nidcnt++] = nid;
441 return 1;
442 }
443/* Set curves based on a colon separate list */
444int tls1_set_curves_list(unsigned char **pext, size_t *pextlen,
445 const char *str)
446 {
447 nid_cb_st ncb;
448 ncb.nidcnt = 0;
449 if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
450 return 0;
451 return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
452 }
fd2b65ce
DSH		 453/* For an EC key set TLS id and required compression based on parameters */
454static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
455 EC_KEY *ec)
456 {
457 int is_prime, id;
458 const EC_GROUP *grp;
459 const EC_POINT *pt;
460 const EC_METHOD *meth;
461 if (!ec)
462 return 0;
463 /* Determine if it is a prime field */
464 grp = EC_KEY_get0_group(ec);
465 pt = EC_KEY_get0_public_key(ec);
466 if (!grp || !pt)
467 return 0;
468 meth = EC_GROUP_method_of(grp);
469 if (!meth)
470 return 0;
471 if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
472 is_prime = 1;
473 else
474 is_prime = 0;
475 /* Determine curve ID */
476 id = EC_GROUP_get_curve_name(grp);
477 id = tls1_ec_nid2curve_id(id);
478 /* If we have an ID set it, otherwise set arbitrary explicit curve */
479 if (id)
480 {
481 curve_id[0] = 0;
482 curve_id[1] = (unsigned char)id;
483 }
484 else
485 {
486 curve_id[0] = 0xff;
487 if (is_prime)
488 curve_id[1] = 0x01;
489 else
490 curve_id[1] = 0x02;
491 }
492 if (comp_id)
493 {
494 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED)
495 {
496 if (is_prime)
497 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
498 else
499 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
500 }
501 else
502 *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
503 }
504 return 1;
505 }
506/* Check an EC key is compatible with extensions */
507static int tls1_check_ec_key(SSL *s,
508 unsigned char *curve_id, unsigned char *comp_id)
509 {
510 const unsigned char *p;
511 size_t plen, i;
a4352630 512 int j;
fd2b65ce
DSH		 513 /* If point formats extension present check it, otherwise everything
514 * is supported (see RFC4492).
515 */
516 if (comp_id && s->session->tlsext_ecpointformatlist)
517 {
518 p = s->session->tlsext_ecpointformatlist;
519 plen = s->session->tlsext_ecpointformatlist_length;
520 for (i = 0; i < plen; i++, p++)
521 {
522 if (*comp_id == *p)
523 break;
524 }
525 if (i == plen)
526 return 0;
527 }
a4352630
DSH		 528 /* Check curve is consistent with client and server preferences */
529 for (j = 0; j <= 1; j++)
fd2b65ce 530 {
a4352630 531 tls1_get_curvelist(s, j, &p, &plen);
fd2b65ce
DSH		 532 for (i = 0; i < plen; i+=2, p+=2)
533 {
534 if (p[0] == curve_id[0] && p[1] == curve_id[1])
a4352630 535 break;
fd2b65ce 536 }
a4352630
DSH		 537 if (i == plen)
538 return 0;
fd2b65ce
DSH		 539 }
540 return 1;
541 }
542/* Check EC server key is compatible with client extensions */
543int tls1_check_ec_server_key(SSL *s)
544 {
545 int rv;
546 CERT_PKEY *cpk = s->cert->pkeys + SSL_PKEY_ECC;
547 EVP_PKEY *pkey;
548 unsigned char comp_id, curve_id[2];
549 if (!cpk->x509 || !cpk->privatekey)
550 return 0;
551 pkey = X509_get_pubkey(cpk->x509);
552 if (!pkey)
553 return 0;
554 rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
555 EVP_PKEY_free(pkey);
556 if (!rv)
557 return 0;
558 return tls1_check_ec_key(s, curve_id, &comp_id);
559 }
560/* Check EC temporary key is compatible with client extensions */
561int tls1_check_ec_tmp_key(SSL *s)
562 {
563 unsigned char curve_id[2];
564 EC_KEY *ec = s->cert->ecdh_tmp;
a4352630
DSH		 565 if (s->cert->ecdh_tmp_auto)
566 {
567 /* Need a shared curve */
568 if (tls1_shared_curve(s, 0))
569 return 1;
570 else return 0;
571 }
fd2b65ce
DSH		 572 if (!ec)
573 {
574 if (s->cert->ecdh_tmp_cb)
575 return 1;
576 else
577 return 0;
578 }
579 if (!tls1_set_ec_id(curve_id, NULL, ec))
580 return 1;
581 return tls1_check_ec_key(s, curve_id, NULL);
582 }
d0595f17 583
525de5d3 584#endif /* OPENSSL_NO_EC */
f1fd4544 585
ed3883d2 586#ifndef OPENSSL_NO_TLSEXT
fc101f88
DSH		 587
588/* List of supported signature algorithms and hashes. Should make this
589 * customisable at some point, for now include everything we support.
590 */
591
592#ifdef OPENSSL_NO_RSA
593#define tlsext_sigalg_rsa(md) /* */
594#else
595#define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
596#endif
597
598#ifdef OPENSSL_NO_DSA
599#define tlsext_sigalg_dsa(md) /* */
600#else
601#define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
602#endif
603
604#ifdef OPENSSL_NO_ECDSA
605#define tlsext_sigalg_ecdsa(md) /* */
606#else
654ac273 607#define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
fc101f88
DSH		 608#endif
609
610#define tlsext_sigalg(md) \
611 tlsext_sigalg_rsa(md) \
612 tlsext_sigalg_dsa(md) \
613 tlsext_sigalg_ecdsa(md)
614
615static unsigned char tls12_sigalgs[] = {
616#ifndef OPENSSL_NO_SHA512
617 tlsext_sigalg(TLSEXT_hash_sha512)
618 tlsext_sigalg(TLSEXT_hash_sha384)
619#endif
620#ifndef OPENSSL_NO_SHA256
621 tlsext_sigalg(TLSEXT_hash_sha256)
622 tlsext_sigalg(TLSEXT_hash_sha224)
623#endif
624#ifndef OPENSSL_NO_SHA
625 tlsext_sigalg(TLSEXT_hash_sha1)
626#endif
627#ifndef OPENSSL_NO_MD5
628 tlsext_sigalg_rsa(TLSEXT_hash_md5)
629#endif
630};
631
0f229cce 632size_t tls12_get_sig_algs(SSL *s, unsigned char *p)
f37f20ff 633 {
0f229cce
DSH		 634 TLS_SIGALGS *sptr = s->cert->conf_sigalgs;
635 size_t slen;
636
637 /* Use custom signature algorithms if any are set */
638
639 if (sptr)
640 {
641 slen = s->cert->conf_sigalgslen;
642 if (p)
643 {
644 size_t i;
645 for (i = 0; i < slen; i++, sptr++)
646 {
647 *p++ = sptr->rhash;
648 *p++ = sptr->rsign;
649 }
650 }
651 return slen * 2;
652 }
653
654 slen = sizeof(tls12_sigalgs);
ebc5e72f
DSH		 655#ifdef OPENSSL_FIPS
656 /* If FIPS mode don't include MD5 which is last */
657 if (FIPS_mode())
658 slen -= 2;
659#endif
f37f20ff 660 if (p)
ebc5e72f 661 memcpy(p, tls12_sigalgs, slen);
0f229cce 662 return slen;
f37f20ff 663 }
fc101f88 664
a9e1c50b
BL		 665/* byte_compare is a compare function for qsort(3) that compares bytes. */
666static int byte_compare(const void *in_a, const void *in_b)
667 {
668 unsigned char a = *((const unsigned char*) in_a);
669 unsigned char b = *((const unsigned char*) in_b);
670
671 if (a > b)
672 return 1;
673 else if (a < b)
674 return -1;
675 return 0;
676}
677
f1fd4544
BM		 678unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
679 {
ed3883d2
BM		 680 int extdatalen=0;
681 unsigned char *ret = p;
d0595f17
DSH		 682#ifndef OPENSSL_NO_EC
683 /* See if we support any ECC ciphersuites */
684 int using_ecc = 0;
685 if (s->version != DTLS1_VERSION && s->version >= TLS1_VERSION)
686 {
687 int i;
688 unsigned long alg_k, alg_a;
689 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
690
691 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
692 {
693 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
694
695 alg_k = c->algorithm_mkey;
696 alg_a = c->algorithm_auth;
697 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)
698 || (alg_a & SSL_aECDSA)))
699 {
700 using_ecc = 1;
701 break;
702 }
703 }
704 }
705#endif
ed3883d2 706
13f6d57b
DSH		 707 /* don't add extensions for SSLv3 unless doing secure renegotiation */
708 if (s->client_version == SSL3_VERSION
709 && !s->s3->send_connection_binding)
5f8f94a6
DSH		 710 return p;
711
ed3883d2
BM		 712 ret+=2;
713
714 if (ret>=limit) return NULL; /* this really never occurs, but ... */
6434abbf 715
a70183bc 716 if (s->tlsext_hostname != NULL)
f1fd4544 717 {
ed3883d2
BM		 718 /* Add TLS extension servername to the Client Hello message */
719 unsigned long size_str;
720 long lenmax;
721
a70183bc 722 /* check for enough space.
52b8dad8
BM		 723 4 for the servername type and entension length
724 2 for servernamelist length
725 1 for the hostname type
726 2 for hostname length
727 + hostname length
a70183bc 728 */
52b8dad8 729
761772d7
BM		 730 if ((lenmax = limit - ret - 9) < 0
731 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
a70183bc
BM		 732 return NULL;
733
734 /* extension type and length */
735 s2n(TLSEXT_TYPE_server_name,ret);
736 s2n(size_str+5,ret);
f1fd4544 737
a70183bc 738 /* length of servername list */
ed3883d2 739 s2n(size_str+3,ret);
a70183bc
BM		 740
741 /* hostname type, length and hostname */
f1fd4544 742 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
ed3883d2 743 s2n(size_str,ret);
ed3883d2
BM		 744 memcpy(ret, s->tlsext_hostname, size_str);
745 ret+=size_str;
f1fd4544 746 }
761772d7 747
423c66f1 748 /* Add RI if renegotiating */
bdd53508 749 if (s->renegotiate)
423c66f1 750 {
860c3dd1
DSH		 751 int el;
752
753 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
754 {
755 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
756 return NULL;
757 }
758
759 if((limit - p - 4 - el) < 0) return NULL;
760
761 s2n(TLSEXT_TYPE_renegotiate,ret);
762 s2n(el,ret);
763
764 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
765 {
766 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
767 return NULL;
768 }
769
770 ret += el;
771 }
772
edc032b5 773#ifndef OPENSSL_NO_SRP
1df80b65 774 /* Add SRP username if there is one */
edc032b5 775 if (s->srp_ctx.login != NULL)
1df80b65 776 { /* Add TLS extension SRP username to the Client Hello message */
edc032b5 777
1df80b65
DSH		 778 int login_len = strlen(s->srp_ctx.login);
779 if (login_len > 255 || login_len == 0)
edc032b5
BL		 780 {
781 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
782 return NULL;
1df80b65
DSH		 783 }
784
785 /* check for enough space.
786 4 for the srp type type and entension length
787 1 for the srp user identity
788 + srp user identity length
789 */
790 if ((limit - ret - 5 - login_len) < 0) return NULL;
791
792 /* fill in the extension */
edc032b5
BL		 793 s2n(TLSEXT_TYPE_srp,ret);
794 s2n(login_len+1,ret);
1df80b65
DSH		 795 (*ret++) = (unsigned char) login_len;
796 memcpy(ret, s->srp_ctx.login, login_len);
edc032b5
BL		 797 ret+=login_len;
798 }
799#endif
800
36ca4ba6 801#ifndef OPENSSL_NO_EC
d0595f17 802 if (using_ecc)
36ca4ba6
BM		 803 {
804 /* Add TLS extension ECPointFormats to the ClientHello message */
805 long lenmax;
d0595f17
DSH		 806 const unsigned char *plist;
807 size_t plistlen;
808 /* If we have a custom point format list use it otherwise
809 * use default */
810 plist = s->tlsext_ecpointformatlist;
811 if (plist)
812 plistlen = s->tlsext_ecpointformatlist_length;
813 else
814 {
815 plist = ecformats_default;
816 plistlen = sizeof(ecformats_default);
817 }
36ca4ba6 818
761772d7 819 if ((lenmax = limit - ret - 5) < 0) return NULL;
d0595f17
DSH		 820 if (plistlen > (size_t)lenmax) return NULL;
821 if (plistlen > 255)
019fdc78
BM		 822 {
823 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
824 return NULL;
825 }
36ca4ba6
BM		 826
827 s2n(TLSEXT_TYPE_ec_point_formats,ret);
d0595f17
DSH		 828 s2n(plistlen + 1,ret);
829 *(ret++) = (unsigned char)plistlen ;
830 memcpy(ret, plist, plistlen);
831 ret+=plistlen;
832
33273721 833 /* Add TLS extension EllipticCurves to the ClientHello message */
d0595f17 834 plist = s->tlsext_ellipticcurvelist;
fd2b65ce 835 tls1_get_curvelist(s, 0, &plist, &plistlen);
33273721 836
761772d7 837 if ((lenmax = limit - ret - 6) < 0) return NULL;
d0595f17
DSH		 838 if (plistlen > (size_t)lenmax) return NULL;
839 if (plistlen > 65532)
33273721
BM		 840 {
841 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
842 return NULL;
843 }
844
845 s2n(TLSEXT_TYPE_elliptic_curves,ret);
d0595f17 846 s2n(plistlen + 2, ret);
a4974de9
BM		 847
848 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
849 * elliptic_curve_list, but the examples use two bytes.
850 * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
851 * resolves this to two bytes.
852 */
d0595f17
DSH		 853 s2n(plistlen, ret);
854 memcpy(ret, plist, plistlen);
855 ret+=plistlen;
33273721 856 }
36ca4ba6 857#endif /* OPENSSL_NO_EC */
d3442bc7 858
6434abbf
DSH		 859 if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
860 {
861 int ticklen;
7ba3838a 862 if (!s->new_session && s->session && s->session->tlsext_tick)
6434abbf 863 ticklen = s->session->tlsext_ticklen;
12bf56c0
DSH		 864 else if (s->session && s->tlsext_session_ticket &&
865 s->tlsext_session_ticket->data)
866 {
867 ticklen = s->tlsext_session_ticket->length;
868 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
869 if (!s->session->tlsext_tick)
870 return NULL;
871 memcpy(s->session->tlsext_tick,
872 s->tlsext_session_ticket->data,
873 ticklen);
874 s->session->tlsext_ticklen = ticklen;
875 }
6434abbf
DSH		 876 else
877 ticklen = 0;
12bf56c0
DSH		 878 if (ticklen == 0 && s->tlsext_session_ticket &&
879 s->tlsext_session_ticket->data == NULL)
880 goto skip_ext;
6434abbf
DSH		 881 /* Check for enough room 2 for extension type, 2 for len
882 * rest for ticket
883 */
761772d7 884 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
6434abbf
DSH		 885 s2n(TLSEXT_TYPE_session_ticket,ret);
886 s2n(ticklen,ret);
887 if (ticklen)
888 {
889 memcpy(ret, s->session->tlsext_tick, ticklen);
890 ret += ticklen;
891 }
892 }
12bf56c0 893 skip_ext:
6434abbf 894
7744ef1a 895 if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
a2f9200f 896 {
0f229cce
DSH		 897 size_t salglen;
898 salglen = tls12_get_sig_algs(s, NULL);
899 if ((size_t)(limit - ret) < salglen + 6)
a2f9200f
DSH		 900 return NULL;
901 s2n(TLSEXT_TYPE_signature_algorithms,ret);
0f229cce
DSH		 902 s2n(salglen + 2, ret);
903 s2n(salglen, ret);
904 tls12_get_sig_algs(s, ret);
905 ret += salglen;
a2f9200f
DSH		 906 }
907
761772d7 908#ifdef TLSEXT_TYPE_opaque_prf_input
8025e251
DSH		 909 if (s->s3->client_opaque_prf_input != NULL &&
910 s->version != DTLS1_VERSION)
761772d7
BM		 911 {
912 size_t col = s->s3->client_opaque_prf_input_len;
913
914 if ((long)(limit - ret - 6 - col < 0))
915 return NULL;
916 if (col > 0xFFFD) /* can't happen */
917 return NULL;
918
919 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
920 s2n(col + 2, ret);
921 s2n(col, ret);
922 memcpy(ret, s->s3->client_opaque_prf_input, col);
923 ret += col;
924 }
925#endif
926
8025e251
DSH		 927 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
928 s->version != DTLS1_VERSION)
67c8e7f4
DSH		 929 {
930 int i;
931 long extlen, idlen, itmp;
932 OCSP_RESPID *id;
933
934 idlen = 0;
935 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
936 {
937 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
938 itmp = i2d_OCSP_RESPID(id, NULL);
939 if (itmp <= 0)
940 return NULL;
941 idlen += itmp + 2;
942 }
943
944 if (s->tlsext_ocsp_exts)
945 {
946 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
947 if (extlen < 0)
948 return NULL;
949 }
950 else
951 extlen = 0;
952
953 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
954 s2n(TLSEXT_TYPE_status_request, ret);
955 if (extlen + idlen > 0xFFF0)
956 return NULL;
957 s2n(extlen + idlen + 5, ret);
958 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
959 s2n(idlen, ret);
960 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
961 {
962 /* save position of id len */
963 unsigned char *q = ret;
964 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
965 /* skip over id len */
966 ret += 2;
967 itmp = i2d_OCSP_RESPID(id, &ret);
968 /* write id len */
969 s2n(itmp, q);
970 }
971 s2n(extlen, ret);
972 if (extlen > 0)
973 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
974 }
975
4817504d
DSH		 976#ifndef OPENSSL_NO_HEARTBEATS
977 /* Add Heartbeat extension */
978 s2n(TLSEXT_TYPE_heartbeat,ret);
979 s2n(1,ret);
980 /* Set mode:
981 * 1: peer may send requests
982 * 2: peer not allowed to send requests
983 */
984 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
985 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
986 else
987 *(ret++) = SSL_TLSEXT_HB_ENABLED;
988#endif
989
bf48836c 990#ifndef OPENSSL_NO_NEXTPROTONEG
ee2ffc27
BL		 991 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
992 {
993 /* The client advertises an emtpy extension to indicate its
994 * support for Next Protocol Negotiation */
995 if (limit - ret - 4 < 0)
996 return NULL;
997 s2n(TLSEXT_TYPE_next_proto_neg,ret);
998 s2n(0,ret);
999 }
1000#endif
1001
333f926d
BL		 1002 if(SSL_get_srtp_profiles(s))
1003 {
1004 int el;
1005
1006 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
1007
1008 if((limit - p - 4 - el) < 0) return NULL;
1009
1010 s2n(TLSEXT_TYPE_use_srtp,ret);
1011 s2n(el,ret);
1012
1013 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
1014 {
1015 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1016 return NULL;
1017 }
1018 ret += el;
1019 }
1020
a9e1c50b
BL		 1021 /* Add TLS extension Server_Authz_DataFormats to the ClientHello */
1022 /* 2 bytes for extension type */
1023 /* 2 bytes for extension length */
1024 /* 1 byte for the list length */
1025 /* 1 byte for the list (we only support audit proofs) */
1026 if (s->ctx->tlsext_authz_server_audit_proof_cb != NULL)
1027 {
1028 size_t lenmax;
1029 const unsigned short ext_len = 2;
1030 const unsigned char list_len = 1;
1031
1032 if ((lenmax = limit - ret - 6) < 0) return NULL;
1033
1034 s2n(TLSEXT_TYPE_server_authz, ret);
1035 /* Extension length: 2 bytes */
1036 s2n(ext_len, ret);
1037 *(ret++) = list_len;
1038 *(ret++) = TLSEXT_AUTHZDATAFORMAT_audit_proof;
1039 }
1040
1041 if ((extdatalen = ret-p-2) == 0)
ed3883d2
BM		 1042 return p;
1043
1044 s2n(extdatalen,p);
1045 return ret;
52b8dad8 1046 }
ed3883d2 1047
f1fd4544
BM		 1048unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
1049 {
ed3883d2
BM		 1050 int extdatalen=0;
1051 unsigned char *ret = p;
bf48836c
BL		 1052#ifndef OPENSSL_NO_NEXTPROTONEG
1053 int next_proto_neg_seen;
ee2ffc27 1054#endif
ed3883d2 1055
13f6d57b
DSH		 1056 /* don't add extensions for SSLv3, unless doing secure renegotiation */
1057 if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
5f8f94a6
DSH		 1058 return p;
1059
a13c20f6 1060 ret+=2;
ed3883d2
BM		 1061 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1062
a13c20f6 1063 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
f1fd4544 1064 {
761772d7 1065 if ((long)(limit - ret - 4) < 0) return NULL;
ed3883d2
BM		 1066
1067 s2n(TLSEXT_TYPE_server_name,ret);
1068 s2n(0,ret);
f1fd4544 1069 }
860c3dd1 1070
8025e251 1071 if(s->s3->send_connection_binding)
860c3dd1
DSH		 1072 {
1073 int el;
1074
1075 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1076 {
1077 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1078 return NULL;
1079 }
1080
1081 if((limit - p - 4 - el) < 0) return NULL;
1082
1083 s2n(TLSEXT_TYPE_renegotiate,ret);
1084 s2n(el,ret);
1085
1086 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1087 {
1088 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1089 return NULL;
1090 }
1091
1092 ret += el;
1093 }
1094
36ca4ba6 1095#ifndef OPENSSL_NO_EC
8025e251
DSH		 1096 if (s->tlsext_ecpointformatlist != NULL &&
1097 s->version != DTLS1_VERSION)
36ca4ba6
BM		 1098 {
1099 /* Add TLS extension ECPointFormats to the ServerHello message */
1100 long lenmax;
1101
761772d7 1102 if ((lenmax = limit - ret - 5) < 0) return NULL;
36ca4ba6 1103 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
019fdc78
BM		 1104 if (s->tlsext_ecpointformatlist_length > 255)
1105 {
1106 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1107 return NULL;
1108 }
36ca4ba6
BM		 1109
1110 s2n(TLSEXT_TYPE_ec_point_formats,ret);
1111 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
1112 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
1113 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
1114 ret+=s->tlsext_ecpointformatlist_length;
a70183bc 1115
36ca4ba6 1116 }
33273721 1117 /* Currently the server should not respond with a SupportedCurves extension */
36ca4ba6 1118#endif /* OPENSSL_NO_EC */
67c8e7f4 1119
6434abbf
DSH		 1120 if (s->tlsext_ticket_expected
1121 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
1122 {
761772d7 1123 if ((long)(limit - ret - 4) < 0) return NULL;
6434abbf
DSH		 1124 s2n(TLSEXT_TYPE_session_ticket,ret);
1125 s2n(0,ret);
1126 }
761772d7 1127
67c8e7f4
DSH		 1128 if (s->tlsext_status_expected)
1129 {
1130 if ((long)(limit - ret - 4) < 0) return NULL;
1131 s2n(TLSEXT_TYPE_status_request,ret);
1132 s2n(0,ret);
1133 }
1134
761772d7 1135#ifdef TLSEXT_TYPE_opaque_prf_input
8025e251
DSH		 1136 if (s->s3->server_opaque_prf_input != NULL &&
1137 s->version != DTLS1_VERSION)
761772d7
BM		 1138 {
1139 size_t sol = s->s3->server_opaque_prf_input_len;
6434abbf 1140
761772d7
BM		 1141 if ((long)(limit - ret - 6 - sol) < 0)
1142 return NULL;
1143 if (sol > 0xFFFD) /* can't happen */
1144 return NULL;
1145
1146 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1147 s2n(sol + 2, ret);
1148 s2n(sol, ret);
1149 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1150 ret += sol;
1151 }
1152#endif
333f926d
BL		 1153
1154 if(s->srtp_profile)
1155 {
1156 int el;
1157
1158 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1159
1160 if((limit - p - 4 - el) < 0) return NULL;
1161
1162 s2n(TLSEXT_TYPE_use_srtp,ret);
1163 s2n(el,ret);
1164
1165 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1166 {
7a236261 1167 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
333f926d
BL		 1168 return NULL;
1169 }
1170 ret+=el;
1171 }
1172
0e1dba93
DSH		 1173 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1174 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1175 { const unsigned char cryptopro_ext[36] = {
1176 0xfd, 0xe8, /*65000*/
1177 0x00, 0x20, /*32 bytes length*/
1178 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1179 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1180 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1181 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1182 if (limit-ret<36) return NULL;
1183 memcpy(ret,cryptopro_ext,36);
1184 ret+=36;
1185
1186 }
761772d7 1187
4817504d 1188#ifndef OPENSSL_NO_HEARTBEATS
5733919d
DSH		 1189 /* Add Heartbeat extension if we've received one */
1190 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1191 {
1192 s2n(TLSEXT_TYPE_heartbeat,ret);
1193 s2n(1,ret);
1194 /* Set mode:
1195 * 1: peer may send requests
1196 * 2: peer not allowed to send requests
1197 */
1198 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1199 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1200 else
1201 *(ret++) = SSL_TLSEXT_HB_ENABLED;
192540b5 1202
5733919d 1203 }
4817504d
DSH		 1204#endif
1205
bf48836c 1206#ifndef OPENSSL_NO_NEXTPROTONEG
ee2ffc27
BL		 1207 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1208 s->s3->next_proto_neg_seen = 0;
1209 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1210 {
1211 const unsigned char *npa;
1212 unsigned int npalen;
1213 int r;
1214
1215 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1216 if (r == SSL_TLSEXT_ERR_OK)
1217 {
1218 if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1219 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1220 s2n(npalen,ret);
1221 memcpy(ret, npa, npalen);
1222 ret += npalen;
1223 s->s3->next_proto_neg_seen = 1;
1224 }
1225 }
1226#endif
1227
a9e1c50b
BL		 1228 /* If the client supports authz then see whether we have any to offer
1229 * to it. */
1230 if (s->s3->tlsext_authz_client_types_len)
1231 {
1232 size_t authz_length;
1233 /* By now we already know the new cipher, so we can look ahead
1234 * to see whether the cert we are going to send
1235 * has any authz data attached to it. */
1236 const unsigned char* authz = ssl_get_authz_data(s, &authz_length);
1237 const unsigned char* const orig_authz = authz;
1238 size_t i;
1239 unsigned authz_count = 0;
1240
1241 /* The authz data contains a number of the following structures:
1242 * uint8_t authz_type
1243 * uint16_t length
1244 * uint8_t data[length]
1245 *
1246 * First we walk over it to find the number of authz elements. */
1247 for (i = 0; i < authz_length; i++)
1248 {
1249 unsigned short length;
1250 unsigned char type;
1251
1252 type = *(authz++);
1253 if (memchr(s->s3->tlsext_authz_client_types,
1254 type,
1255 s->s3->tlsext_authz_client_types_len) != NULL)
1256 authz_count++;
1257
1258 n2s(authz, length);
aeda172a
BL		 1259 /* n2s increments authz by 2 */
1260 i += 2;
a9e1c50b
BL		 1261 authz += length;
1262 i += length;
1263 }
1264
1265 if (authz_count)
1266 {
1267 /* Add TLS extension server_authz to the ServerHello message
1268 * 2 bytes for extension type
1269 * 2 bytes for extension length
1270 * 1 byte for the list length
1271 * n bytes for the list */
1272 const unsigned short ext_len = 1 + authz_count;
1273
1274 if ((long)(limit - ret - 4 - ext_len) < 0) return NULL;
1275 s2n(TLSEXT_TYPE_server_authz, ret);
1276 s2n(ext_len, ret);
1277 *(ret++) = authz_count;
1278 s->s3->tlsext_authz_promised_to_client = 1;
1279 }
1280
1281 authz = orig_authz;
1282 for (i = 0; i < authz_length; i++)
1283 {
1284 unsigned short length;
1285 unsigned char type;
1286
1287 authz_count++;
1288 type = *(authz++);
1289 if (memchr(s->s3->tlsext_authz_client_types,
1290 type,
1291 s->s3->tlsext_authz_client_types_len) != NULL)
1292 *(ret++) = type;
1293 n2s(authz, length);
aeda172a
BL		 1294 /* n2s increments authz by 2 */
1295 i += 2;
a9e1c50b
BL		 1296 authz += length;
1297 i += length;
1298 }
1299 }
1300
ed3883d2
BM		 1301 if ((extdatalen = ret-p-2)== 0)
1302 return p;
1303
1304 s2n(extdatalen,p);
1305 return ret;
52b8dad8 1306 }
ed3883d2 1307
b2284ed3
DSH		 1308static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1309 {
ed3883d2
BM		 1310 unsigned short type;
1311 unsigned short size;
1312 unsigned short len;
f1fd4544 1313 unsigned char *data = *p;
860c3dd1 1314 int renegotiate_seen = 0;
6b7be581 1315 int sigalg_seen = 0;
860c3dd1 1316
a13c20f6 1317 s->servername_done = 0;
67c8e7f4 1318 s->tlsext_status_type = -1;
6f31dd72
BM		 1319#ifndef OPENSSL_NO_NEXTPROTONEG
1320 s->s3->next_proto_neg_seen = 0;
1321#endif
ed3883d2 1322
4817504d
DSH		 1323#ifndef OPENSSL_NO_HEARTBEATS
1324 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1325 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1326#endif
1327
ed3883d2 1328 if (data >= (d+n-2))
c27c9cb4 1329 goto ri_check;
ed3883d2
BM		 1330 n2s(data,len);
1331
52b8dad8 1332 if (data > (d+n-len))
c27c9cb4 1333 goto ri_check;
ed3883d2 1334
f1fd4544
BM		 1335 while (data <= (d+n-4))
1336 {
ed3883d2
BM		 1337 n2s(data,type);
1338 n2s(data,size);
1339
1340 if (data+size > (d+n))
c27c9cb4 1341 goto ri_check;
8e3b2dbb 1342#if 0
0e1dba93 1343 fprintf(stderr,"Received extension type %d size %d\n",type,size);
8e3b2dbb 1344#endif
6434abbf
DSH		 1345 if (s->tlsext_debug_cb)
1346 s->tlsext_debug_cb(s, 0, type, data, size,
1347 s->tlsext_debug_arg);
a13c20f6
BM		 1348/* The servername extension is treated as follows:
1349
1350 - Only the hostname type is supported with a maximum length of 255.
1351 - The servername is rejected if too long or if it contains zeros,
1352 in which case an fatal alert is generated.
1353 - The servername field is maintained together with the session cache.
1354 - When a session is resumed, the servername call back invoked in order
1355 to allow the application to position itself to the right context.
1356 - The servername is acknowledged if it is new for a session or when
1357 it is identical to a previously used for the same session.
1358 Applications can control the behaviour. They can at any time
1359 set a 'desirable' servername for a new SSL object. This can be the
1360 case for example with HTTPS when a Host: header field is received and
1361 a renegotiation is requested. In this case, a possible servername
1362 presented in the new client hello is only acknowledged if it matches
1363 the value of the Host: field.
1364 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1365 if they provide for changing an explicit servername context for the session,
1366 i.e. when the session has been established with a servername extension.
1367 - On session reconnect, the servername extension may be absent.
1368
1369*/
1370
f1fd4544
BM		 1371 if (type == TLSEXT_TYPE_server_name)
1372 {
a70183bc 1373 unsigned char *sdata;
ed3883d2 1374 int servname_type;
a70183bc
BM		 1375 int dsize;
1376
1377 if (size < 2)
1378 {
1379 *al = SSL_AD_DECODE_ERROR;
1380 return 0;
1381 }
1382 n2s(data,dsize);
52b8dad8 1383 size -= 2;
a70183bc 1384 if (dsize > size )
f1fd4544 1385 {
a70183bc
BM		 1386 *al = SSL_AD_DECODE_ERROR;
1387 return 0;
1388 }
1389
1390 sdata = data;
1391 while (dsize > 3)
1392 {
1393 servname_type = *(sdata++);
ed3883d2 1394 n2s(sdata,len);
a70183bc
BM		 1395 dsize -= 3;
1396
1397 if (len > dsize)
f1fd4544
BM		 1398 {
1399 *al = SSL_AD_DECODE_ERROR;
1400 return 0;
1401 }
a70183bc 1402 if (s->servername_done == 0)
f1fd4544
BM		 1403 switch (servname_type)
1404 {
1405 case TLSEXT_NAMETYPE_host_name:
732d31be 1406 if (!s->hit)
f1fd4544 1407 {
732d31be
DSH		 1408 if(s->session->tlsext_hostname)
1409 {
1410 *al = SSL_AD_DECODE_ERROR;
1411 return 0;
1412 }
1413 if (len > TLSEXT_MAXLEN_host_name)
f1fd4544
BM		 1414 {
1415 *al = TLS1_AD_UNRECOGNIZED_NAME;
1416 return 0;
1417 }
732d31be
DSH		 1418 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
1419 {
1420 *al = TLS1_AD_INTERNAL_ERROR;
1421 return 0;
1422 }
ed3883d2 1423 memcpy(s->session->tlsext_hostname, sdata, len);
a13c20f6
BM		 1424 s->session->tlsext_hostname[len]='\0';
1425 if (strlen(s->session->tlsext_hostname) != len) {
1426 OPENSSL_free(s->session->tlsext_hostname);
40a70628 1427 s->session->tlsext_hostname = NULL;
a13c20f6
BM		 1428 *al = TLS1_AD_UNRECOGNIZED_NAME;
1429 return 0;
f1fd4544 1430 }
a13c20f6
BM		 1431 s->servername_done = 1;
1432
a13c20f6
BM		 1433 }
1434 else
732d31be
DSH		 1435 s->servername_done = s->session->tlsext_hostname
1436 && strlen(s->session->tlsext_hostname) == len
6b9e941e 1437 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
a13c20f6 1438
ed3883d2 1439 break;
f1fd4544 1440
ed3883d2
BM		 1441 default:
1442 break;
f1fd4544 1443 }
52b8dad8 1444
a70183bc 1445 dsize -= len;
f1fd4544 1446 }
a70183bc
BM		 1447 if (dsize != 0)
1448 {
1449 *al = SSL_AD_DECODE_ERROR;
1450 return 0;
1451 }
1452
ed3883d2 1453 }
edc032b5
BL		 1454#ifndef OPENSSL_NO_SRP
1455 else if (type == TLSEXT_TYPE_srp)
1456 {
1df80b65
DSH		 1457 if (size <= 0 || ((len = data[0])) != (size -1))
1458 {
1459 *al = SSL_AD_DECODE_ERROR;
1460 return 0;
1461 }
1462 if (s->srp_ctx.login != NULL)
edc032b5 1463 {
1df80b65
DSH		 1464 *al = SSL_AD_DECODE_ERROR;
1465 return 0;
1466 }
1467 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
1468 return -1;
1469 memcpy(s->srp_ctx.login, &data[1], len);
1470 s->srp_ctx.login[len]='\0';
1471
1472 if (strlen(s->srp_ctx.login) != len)
1473 {
1474 *al = SSL_AD_DECODE_ERROR;
1475 return 0;
edc032b5
BL		 1476 }
1477 }
1478#endif
ed3883d2 1479
36ca4ba6 1480#ifndef OPENSSL_NO_EC
8025e251
DSH		 1481 else if (type == TLSEXT_TYPE_ec_point_formats &&
1482 s->version != DTLS1_VERSION)
36ca4ba6
BM		 1483 {
1484 unsigned char *sdata = data;
1485 int ecpointformatlist_length = *(sdata++);
36ca4ba6
BM		 1486
1487 if (ecpointformatlist_length != size - 1)
1488 {
1489 *al = TLS1_AD_DECODE_ERROR;
1490 return 0;
1491 }
732d31be 1492 if (!s->hit)
36ca4ba6 1493 {
732d31be
DSH		 1494 if(s->session->tlsext_ecpointformatlist)
1495 {
7d5686d3
DSH		 1496 OPENSSL_free(s->session->tlsext_ecpointformatlist);
1497 s->session->tlsext_ecpointformatlist = NULL;
732d31be
DSH		 1498 }
1499 s->session->tlsext_ecpointformatlist_length = 0;
1500 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1501 {
1502 *al = TLS1_AD_INTERNAL_ERROR;
1503 return 0;
1504 }
1505 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1506 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
36ca4ba6 1507 }
36ca4ba6
BM		 1508#if 0
1509 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
1510 sdata = s->session->tlsext_ecpointformatlist;
1511 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1512 fprintf(stderr,"%i ",*(sdata++));
1513 fprintf(stderr,"\n");
33273721
BM		 1514#endif
1515 }
8025e251
DSH		 1516 else if (type == TLSEXT_TYPE_elliptic_curves &&
1517 s->version != DTLS1_VERSION)
33273721
BM		 1518 {
1519 unsigned char *sdata = data;
1520 int ellipticcurvelist_length = (*(sdata++) << 8);
1521 ellipticcurvelist_length += (*(sdata++));
1522
1523 if (ellipticcurvelist_length != size - 2)
1524 {
1525 *al = TLS1_AD_DECODE_ERROR;
1526 return 0;
1527 }
732d31be 1528 if (!s->hit)
33273721 1529 {
732d31be
DSH		 1530 if(s->session->tlsext_ellipticcurvelist)
1531 {
1532 *al = TLS1_AD_DECODE_ERROR;
1533 return 0;
1534 }
1535 s->session->tlsext_ellipticcurvelist_length = 0;
1536 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
1537 {
1538 *al = TLS1_AD_INTERNAL_ERROR;
1539 return 0;
1540 }
1541 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
1542 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
33273721 1543 }
33273721
BM		 1544#if 0
1545 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
1546 sdata = s->session->tlsext_ellipticcurvelist;
1547 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
1548 fprintf(stderr,"%i ",*(sdata++));
1549 fprintf(stderr,"\n");
36ca4ba6
BM		 1550#endif
1551 }
c6a27f01 1552#endif /* OPENSSL_NO_EC */
761772d7 1553#ifdef TLSEXT_TYPE_opaque_prf_input
8025e251
DSH		 1554 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1555 s->version != DTLS1_VERSION)
761772d7
BM		 1556 {
1557 unsigned char *sdata = data;
1558
1559 if (size < 2)
1560 {
1561 *al = SSL_AD_DECODE_ERROR;
1562 return 0;
1563 }
1564 n2s(sdata, s->s3->client_opaque_prf_input_len);
1565 if (s->s3->client_opaque_prf_input_len != size - 2)
1566 {
1567 *al = SSL_AD_DECODE_ERROR;
1568 return 0;
1569 }
1570
1571 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1572 OPENSSL_free(s->s3->client_opaque_prf_input);
02c27b11
BM		 1573 if (s->s3->client_opaque_prf_input_len == 0)
1574 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1575 else
1576 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
761772d7
BM		 1577 if (s->s3->client_opaque_prf_input == NULL)
1578 {
1579 *al = TLS1_AD_INTERNAL_ERROR;
1580 return 0;
1581 }
1582 }
1583#endif
12bf56c0
DSH		 1584 else if (type == TLSEXT_TYPE_session_ticket)
1585 {
1586 if (s->tls_session_ticket_ext_cb &&
1587 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1588 {
1589 *al = TLS1_AD_INTERNAL_ERROR;
1590 return 0;
1591 }
1592 }
860c3dd1
DSH		 1593 else if (type == TLSEXT_TYPE_renegotiate)
1594 {
1595 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
1596 return 0;
1597 renegotiate_seen = 1;
1598 }
6b7be581
DSH		 1599 else if (type == TLSEXT_TYPE_signature_algorithms)
1600 {
1601 int dsize;
1602 if (sigalg_seen || size < 2)
1603 {
1604 *al = SSL_AD_DECODE_ERROR;
1605 return 0;
1606 }
1607 sigalg_seen = 1;
1608 n2s(data,dsize);
1609 size -= 2;
1610 if (dsize != size || dsize & 1)
1611 {
1612 *al = SSL_AD_DECODE_ERROR;
1613 return 0;
1614 }
1615 if (!tls1_process_sigalgs(s, data, dsize))
1616 {
1617 *al = SSL_AD_DECODE_ERROR;
1618 return 0;
1619 }
1620 }
8025e251
DSH		 1621 else if (type == TLSEXT_TYPE_status_request &&
1622 s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
67c8e7f4
DSH		 1623 {
1624
1625 if (size < 5)
1626 {
1627 *al = SSL_AD_DECODE_ERROR;
1628 return 0;
1629 }
1630
1631 s->tlsext_status_type = *data++;
1632 size--;
1633 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
1634 {
1635 const unsigned char *sdata;
1636 int dsize;
1637 /* Read in responder_id_list */
1638 n2s(data,dsize);
1639 size -= 2;
1640 if (dsize > size )
1641 {
1642 *al = SSL_AD_DECODE_ERROR;
1643 return 0;
1644 }
1645 while (dsize > 0)
1646 {
1647 OCSP_RESPID *id;
1648 int idsize;
1649 if (dsize < 4)
1650 {
1651 *al = SSL_AD_DECODE_ERROR;
1652 return 0;
1653 }
1654 n2s(data, idsize);
1655 dsize -= 2 + idsize;
9770924f 1656 size -= 2 + idsize;
67c8e7f4
DSH		 1657 if (dsize < 0)
1658 {
1659 *al = SSL_AD_DECODE_ERROR;
1660 return 0;
1661 }
1662 sdata = data;
1663 data += idsize;
1664 id = d2i_OCSP_RESPID(NULL,
1665 &sdata, idsize);
1666 if (!id)
1667 {
1668 *al = SSL_AD_DECODE_ERROR;
1669 return 0;
1670 }
1671 if (data != sdata)
1672 {
1673 OCSP_RESPID_free(id);
1674 *al = SSL_AD_DECODE_ERROR;
1675 return 0;
1676 }
1677 if (!s->tlsext_ocsp_ids
1678 && !(s->tlsext_ocsp_ids =
1679 sk_OCSP_RESPID_new_null()))
1680 {
1681 OCSP_RESPID_free(id);
1682 *al = SSL_AD_INTERNAL_ERROR;
1683 return 0;
1684 }
1685 if (!sk_OCSP_RESPID_push(
1686 s->tlsext_ocsp_ids, id))
1687 {
1688 OCSP_RESPID_free(id);
1689 *al = SSL_AD_INTERNAL_ERROR;
1690 return 0;
1691 }
1692 }
1693
1694 /* Read in request_extensions */
9770924f
BM		 1695 if (size < 2)
1696 {
1697 *al = SSL_AD_DECODE_ERROR;
1698 return 0;
1699 }
67c8e7f4
DSH		 1700 n2s(data,dsize);
1701 size -= 2;
9770924f 1702 if (dsize != size)
67c8e7f4
DSH		 1703 {
1704 *al = SSL_AD_DECODE_ERROR;
1705 return 0;
1706 }
1707 sdata = data;
1708 if (dsize > 0)
1709 {
25536ea6
DSH		 1710 if (s->tlsext_ocsp_exts)
1711 {
1712 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
1713 X509_EXTENSION_free);
1714 }
1715
67c8e7f4
DSH		 1716 s->tlsext_ocsp_exts =
1717 d2i_X509_EXTENSIONS(NULL,
1718 &sdata, dsize);
1719 if (!s->tlsext_ocsp_exts
1720 || (data + dsize != sdata))
1721 {
1722 *al = SSL_AD_DECODE_ERROR;
1723 return 0;
1724 }
1725 }
1726 }
1727 /* We don't know what to do with any other type
1728 * so ignore it.
1729 */
1730 else
1731 s->tlsext_status_type = -1;
1732 }
4817504d
DSH		 1733#ifndef OPENSSL_NO_HEARTBEATS
1734 else if (type == TLSEXT_TYPE_heartbeat)
1735 {
1736 switch(data[0])
1737 {
1738 case 0x01: /* Client allows us to send HB requests */
1739 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1740 break;
1741 case 0x02: /* Client doesn't accept HB requests */
1742 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
1743 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1744 break;
192540b5
DSH		 1745 default: *al = SSL_AD_ILLEGAL_PARAMETER;
1746 return 0;
4817504d
DSH		 1747 }
1748 }
1749#endif
bf48836c 1750#ifndef OPENSSL_NO_NEXTPROTONEG
ee2ffc27 1751 else if (type == TLSEXT_TYPE_next_proto_neg &&
71fa4513 1752 s->s3->tmp.finish_md_len == 0)
ee2ffc27
BL		 1753 {
1754 /* We shouldn't accept this extension on a
1755 * renegotiation.
1756 *
1757 * s->new_session will be set on renegotiation, but we
1758 * probably shouldn't rely that it couldn't be set on
1759 * the initial renegotation too in certain cases (when
1760 * there's some other reason to disallow resuming an
1761 * earlier session -- the current code won't be doing
1762 * anything like that, but this might change).
1763
1764 * A valid sign that there's been a previous handshake
1765 * in this connection is if s->s3->tmp.finish_md_len >
1766 * 0. (We are talking about a check that will happen
1767 * in the Hello protocol round, well before a new
1768 * Finished message could have been computed.) */
1769 s->s3->next_proto_neg_seen = 1;
1770 }
1771#endif
761772d7 1772
6434abbf 1773 /* session ticket processed earlier */
333f926d
BL		 1774 else if (type == TLSEXT_TYPE_use_srtp)
1775 {
1776 if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
1777 al))
1778 return 0;
1779 }
1780
a9e1c50b
BL		 1781 else if (type == TLSEXT_TYPE_server_authz)
1782 {
1783 unsigned char *sdata = data;
1784 unsigned char server_authz_dataformatlist_length;
1785
1786 if (size == 0)
1787 {
1788 *al = TLS1_AD_DECODE_ERROR;
1789 return 0;
1790 }
1791
1792 server_authz_dataformatlist_length = *(sdata++);
1793
1794 if (server_authz_dataformatlist_length != size - 1)
1795 {
1796 *al = TLS1_AD_DECODE_ERROR;
1797 return 0;
1798 }
1799
1800 /* Successful session resumption uses the same authz
1801 * information as the original session so we ignore this
1802 * in the case of a session resumption. */
1803 if (!s->hit)
1804 {
1805 size_t i;
195b9eee
BL		 1806 if (s->s3->tlsext_authz_client_types != NULL)
1807 OPENSSL_free(s->s3->tlsext_authz_client_types);
a9e1c50b
BL		 1808 s->s3->tlsext_authz_client_types =
1809 OPENSSL_malloc(server_authz_dataformatlist_length);
1810 if (!s->s3->tlsext_authz_client_types)
1811 {
1812 *al = TLS1_AD_INTERNAL_ERROR;
1813 return 0;
1814 }
1815
1816 s->s3->tlsext_authz_client_types_len =
1817 server_authz_dataformatlist_length;
1818 memcpy(s->s3->tlsext_authz_client_types,
1819 sdata,
1820 server_authz_dataformatlist_length);
1821
1822 /* Sort the types in order to check for duplicates. */
1823 qsort(s->s3->tlsext_authz_client_types,
1824 server_authz_dataformatlist_length,
1825 1 /* element size */,
1826 byte_compare);
1827
1828 for (i = 0; i < server_authz_dataformatlist_length; i++)
1829 {
1830 if (i > 0 &&
1831 s->s3->tlsext_authz_client_types[i] ==
1832 s->s3->tlsext_authz_client_types[i-1])
1833 {
1834 *al = TLS1_AD_DECODE_ERROR;
1835 return 0;
1836 }
1837 }
1838 }
1839 }
1840
6434abbf 1841 data+=size;
f1fd4544 1842 }
a9e1c50b 1843
f1fd4544 1844 *p = data;
c27c9cb4
DSH		 1845
1846 ri_check:
1847
1848 /* Need RI if renegotiating */
1849
bdd53508 1850 if (!renegotiate_seen && s->renegotiate &&
c27c9cb4
DSH		 1851 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1852 {
fbed9f81 1853 *al = SSL_AD_HANDSHAKE_FAILURE;
aa09c2c6 1854 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
c27c9cb4
DSH		 1855 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1856 return 0;
1857 }
1858
f1fd4544 1859 return 1;
52b8dad8 1860 }
f1fd4544 1861
b2284ed3
DSH		 1862int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
1863 {
1864 int al = -1;
1865 if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
1866 {
1867 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1868 return 0;
1869 }
1870
1871 if (ssl_check_clienthello_tlsext(s) <= 0)
1872 {
aa09c2c6 1873 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
b2284ed3
DSH		 1874 return 0;
1875 }
1876 return 1;
1877}
1878
bf48836c 1879#ifndef OPENSSL_NO_NEXTPROTONEG
ee2ffc27
BL		 1880/* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
1881 * elements of zero length are allowed and the set of elements must exactly fill
1882 * the length of the block. */
71fa4513 1883static char ssl_next_proto_validate(unsigned char *d, unsigned len)
ee2ffc27
BL		 1884 {
1885 unsigned int off = 0;
1886
1887 while (off < len)
1888 {
1889 if (d[off] == 0)
1890 return 0;
1891 off += d[off];
1892 off++;
1893 }
1894
1895 return off == len;
1896 }
1897#endif
1898
09e4e4b9 1899static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
f1fd4544 1900 {
c8bbd98a 1901 unsigned short length;
ed3883d2
BM		 1902 unsigned short type;
1903 unsigned short size;
ed3883d2 1904 unsigned char *data = *p;
ed3883d2 1905 int tlsext_servername = 0;
860c3dd1 1906 int renegotiate_seen = 0;
ed3883d2 1907
6f31dd72
BM		 1908#ifndef OPENSSL_NO_NEXTPROTONEG
1909 s->s3->next_proto_neg_seen = 0;
1910#endif
1911
4817504d
DSH		 1912#ifndef OPENSSL_NO_HEARTBEATS
1913 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1914 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1915#endif
1916
ed3883d2 1917 if (data >= (d+n-2))
c27c9cb4 1918 goto ri_check;
ed3883d2 1919
c8bbd98a
BL		 1920 n2s(data,length);
1921 if (data+length != d+n)
1922 {
1923 *al = SSL_AD_DECODE_ERROR;
1924 return 0;
1925 }
ed3883d2 1926
f1fd4544
BM		 1927 while(data <= (d+n-4))
1928 {
ed3883d2
BM		 1929 n2s(data,type);
1930 n2s(data,size);
1931
1932 if (data+size > (d+n))
c27c9cb4 1933 goto ri_check;
f1fd4544 1934
6434abbf
DSH		 1935 if (s->tlsext_debug_cb)
1936 s->tlsext_debug_cb(s, 1, type, data, size,
1937 s->tlsext_debug_arg);
1938
f1fd4544
BM		 1939 if (type == TLSEXT_TYPE_server_name)
1940 {
1941 if (s->tlsext_hostname == NULL || size > 0)
1942 {
1943 *al = TLS1_AD_UNRECOGNIZED_NAME;
1944 return 0;
1945 }
ed3883d2 1946 tlsext_servername = 1;
f1fd4544 1947 }
ed3883d2 1948
36ca4ba6 1949#ifndef OPENSSL_NO_EC
8025e251
DSH		 1950 else if (type == TLSEXT_TYPE_ec_point_formats &&
1951 s->version != DTLS1_VERSION)
36ca4ba6
BM		 1952 {
1953 unsigned char *sdata = data;
1954 int ecpointformatlist_length = *(sdata++);
36ca4ba6
BM		 1955
1956 if (ecpointformatlist_length != size - 1)
1957 {
1958 *al = TLS1_AD_DECODE_ERROR;
1959 return 0;
1960 }
1961 s->session->tlsext_ecpointformatlist_length = 0;
b6acb8d0 1962 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
36ca4ba6
BM		 1963 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1964 {
1965 *al = TLS1_AD_INTERNAL_ERROR;
1966 return 0;
1967 }
1968 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1969 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1970#if 0
1971 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1972 sdata = s->session->tlsext_ecpointformatlist;
1973 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1974 fprintf(stderr,"%i ",*(sdata++));
1975 fprintf(stderr,"\n");
1976#endif
1977 }
c6a27f01 1978#endif /* OPENSSL_NO_EC */
6434abbf
DSH		 1979
1980 else if (type == TLSEXT_TYPE_session_ticket)
1981 {
12bf56c0
DSH		 1982 if (s->tls_session_ticket_ext_cb &&
1983 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1984 {
1985 *al = TLS1_AD_INTERNAL_ERROR;
1986 return 0;
1987 }
6434abbf
DSH		 1988 if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1989 || (size > 0))
1990 {
1991 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1992 return 0;
1993 }
1994 s->tlsext_ticket_expected = 1;
1995 }
761772d7 1996#ifdef TLSEXT_TYPE_opaque_prf_input
8025e251
DSH		 1997 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1998 s->version != DTLS1_VERSION)
761772d7
BM		 1999 {
2000 unsigned char *sdata = data;
2001
2002 if (size < 2)
2003 {
2004 *al = SSL_AD_DECODE_ERROR;
2005 return 0;
2006 }
2007 n2s(sdata, s->s3->server_opaque_prf_input_len);
2008 if (s->s3->server_opaque_prf_input_len != size - 2)
2009 {
2010 *al = SSL_AD_DECODE_ERROR;
2011 return 0;
2012 }
2013
2014 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2015 OPENSSL_free(s->s3->server_opaque_prf_input);
02c27b11
BM		 2016 if (s->s3->server_opaque_prf_input_len == 0)
2017 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2018 else
2019 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
761772d7
BM		 2020
2021 if (s->s3->server_opaque_prf_input == NULL)
2022 {
2023 *al = TLS1_AD_INTERNAL_ERROR;
2024 return 0;
2025 }
2026 }
2027#endif
8025e251
DSH		 2028 else if (type == TLSEXT_TYPE_status_request &&
2029 s->version != DTLS1_VERSION)
67c8e7f4
DSH		 2030 {
2031 /* MUST be empty and only sent if we've requested
2032 * a status request message.
2033 */
2034 if ((s->tlsext_status_type == -1) || (size > 0))
2035 {
2036 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2037 return 0;
2038 }
2039 /* Set flag to expect CertificateStatus message */
2040 s->tlsext_status_expected = 1;
2041 }
bf48836c 2042#ifndef OPENSSL_NO_NEXTPROTONEG
6f31dd72
BM		 2043 else if (type == TLSEXT_TYPE_next_proto_neg &&
2044 s->s3->tmp.finish_md_len == 0)
ee2ffc27
BL		 2045 {
2046 unsigned char *selected;
2047 unsigned char selected_len;
2048
2049 /* We must have requested it. */
2050 if ((s->ctx->next_proto_select_cb == NULL))
2051 {
2052 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2053 return 0;
2054 }
2055 /* The data must be valid */
2056 if (!ssl_next_proto_validate(data, size))
2057 {
2058 *al = TLS1_AD_DECODE_ERROR;
2059 return 0;
2060 }
2061 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2062 {
2063 *al = TLS1_AD_INTERNAL_ERROR;
2064 return 0;
2065 }
2066 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2067 if (!s->next_proto_negotiated)
2068 {
2069 *al = TLS1_AD_INTERNAL_ERROR;
2070 return 0;
2071 }
2072 memcpy(s->next_proto_negotiated, selected, selected_len);
2073 s->next_proto_negotiated_len = selected_len;
6f31dd72 2074 s->s3->next_proto_neg_seen = 1;
ee2ffc27
BL		 2075 }
2076#endif
860c3dd1
DSH		 2077 else if (type == TLSEXT_TYPE_renegotiate)
2078 {
2079 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2080 return 0;
2081 renegotiate_seen = 1;
2082 }
4817504d
DSH		 2083#ifndef OPENSSL_NO_HEARTBEATS
2084 else if (type == TLSEXT_TYPE_heartbeat)
2085 {
2086 switch(data[0])
2087 {
2088 case 0x01: /* Server allows us to send HB requests */
2089 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2090 break;
2091 case 0x02: /* Server doesn't accept HB requests */
2092 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2093 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2094 break;
192540b5
DSH		 2095 default: *al = SSL_AD_ILLEGAL_PARAMETER;
2096 return 0;
4817504d
DSH		 2097 }
2098 }
2099#endif
333f926d
BL		 2100 else if (type == TLSEXT_TYPE_use_srtp)
2101 {
2102 if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2103 al))
2104 return 0;
2105 }
2106
a9e1c50b
BL		 2107 else if (type == TLSEXT_TYPE_server_authz)
2108 {
2109 /* We only support audit proofs. It's an error to send
2110 * an authz hello extension if the client
2111 * didn't request a proof. */
2112 unsigned char *sdata = data;
2113 unsigned char server_authz_dataformatlist_length;
2114
2115 if (!s->ctx->tlsext_authz_server_audit_proof_cb)
2116 {
2117 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2118 return 0;
2119 }
2120
2121 if (!size)
2122 {
2123 *al = TLS1_AD_DECODE_ERROR;
2124 return 0;
2125 }
2126
2127 server_authz_dataformatlist_length = *(sdata++);
2128 if (server_authz_dataformatlist_length != size - 1)
2129 {
2130 *al = TLS1_AD_DECODE_ERROR;
2131 return 0;
2132 }
2133
2134 /* We only support audit proofs, so a legal ServerHello
2135 * authz list contains exactly one entry. */
2136 if (server_authz_dataformatlist_length != 1 ||
2137 sdata[0] != TLSEXT_AUTHZDATAFORMAT_audit_proof)
2138 {
2139 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2140 return 0;
2141 }
2142
2143 s->s3->tlsext_authz_server_promised = 1;
2144 }
2145
2146 data += size;
f1fd4544 2147 }
ed3883d2
BM		 2148
2149 if (data != d+n)
f1fd4544
BM		 2150 {
2151 *al = SSL_AD_DECODE_ERROR;
2152 return 0;
2153 }
ed3883d2 2154
f1fd4544
BM		 2155 if (!s->hit && tlsext_servername == 1)
2156 {
2157 if (s->tlsext_hostname)
2158 {
2159 if (s->session->tlsext_hostname == NULL)
2160 {
ed3883d2
BM		 2161 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2162 if (!s->session->tlsext_hostname)
f1fd4544
BM		 2163 {
2164 *al = SSL_AD_UNRECOGNIZED_NAME;
2165 return 0;
2166 }
2167 }
2168 else
2169 {
2170 *al = SSL_AD_DECODE_ERROR;
2171 return 0;
2172 }
ed3883d2 2173 }
f1fd4544 2174 }
ed3883d2 2175
f1fd4544 2176 *p = data;
c27c9cb4
DSH		 2177
2178 ri_check:
2179
2180 /* Determine if we need to see RI. Strictly speaking if we want to
2181 * avoid an attack we should *always* see RI even on initial server
2182 * hello because the client doesn't see any renegotiation during an
2183 * attack. However this would mean we could not connect to any server
2184 * which doesn't support RI so for the immediate future tolerate RI
2185 * absence on initial connect only.
2186 */
c2c49969
DSH		 2187 if (!renegotiate_seen
2188 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
ef51b4b9 2189 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
c27c9cb4 2190 {
fbed9f81 2191 *al = SSL_AD_HANDSHAKE_FAILURE;
09e4e4b9 2192 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
c27c9cb4
DSH		 2193 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2194 return 0;
2195 }
2196
f1fd4544 2197 return 1;
52b8dad8 2198 }
ed3883d2 2199
b2172f4f 2200
36ca4ba6
BM		 2201int ssl_prepare_clienthello_tlsext(SSL *s)
2202 {
761772d7
BM		 2203
2204#ifdef TLSEXT_TYPE_opaque_prf_input
2205 {
2206 int r = 1;
2207
2208 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2209 {
2210 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2211 if (!r)
2212 return -1;
2213 }
2214
2215 if (s->tlsext_opaque_prf_input != NULL)
2216 {
2217 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2218 OPENSSL_free(s->s3->client_opaque_prf_input);
2219
02c27b11
BM		 2220 if (s->tlsext_opaque_prf_input_len == 0)
2221 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2222 else
2223 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
761772d7
BM		 2224 if (s->s3->client_opaque_prf_input == NULL)
2225 {
2226 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2227 return -1;
2228 }
2229 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2230 }
2231
2232 if (r == 2)
2233 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2234 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2235 }
2236#endif
2237
36ca4ba6 2238 return 1;
52b8dad8 2239 }
36ca4ba6
BM		 2240
2241int ssl_prepare_serverhello_tlsext(SSL *s)
2242 {
2243#ifndef OPENSSL_NO_EC
b6acb8d0 2244 /* If we are server and using an ECC cipher suite, send the point formats we support
33273721
BM		 2245 * if the client sent us an ECPointsFormat extension. Note that the server is not
2246 * supposed to send an EllipticCurves extension.
36ca4ba6 2247 */
36ca4ba6 2248
52b8dad8
BM		 2249 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2250 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2251 int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
2252 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
2253
36ca4ba6
BM		 2254 if (using_ecc)
2255 {
b6acb8d0
BM		 2256 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
2257 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
36ca4ba6 2258 {
a291745e 2259 SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
36ca4ba6
BM		 2260 return -1;
2261 }
b6acb8d0
BM		 2262 s->tlsext_ecpointformatlist_length = 3;
2263 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
2264 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
2265 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
36ca4ba6
BM		 2266 }
2267#endif /* OPENSSL_NO_EC */
761772d7 2268
36ca4ba6 2269 return 1;
52b8dad8 2270 }
36ca4ba6 2271
09e4e4b9 2272static int ssl_check_clienthello_tlsext(SSL *s)
f1fd4544 2273 {
241520e6 2274 int ret=SSL_TLSEXT_ERR_NOACK;
36ca4ba6
BM		 2275 int al = SSL_AD_UNRECOGNIZED_NAME;
2276
2277#ifndef OPENSSL_NO_EC
33273721
BM		 2278 /* The handling of the ECPointFormats extension is done elsewhere, namely in
2279 * ssl3_choose_cipher in s3_lib.c.
2280 */
2281 /* The handling of the EllipticCurves extension is done elsewhere, namely in
2282 * ssl3_choose_cipher in s3_lib.c.
36ca4ba6
BM		 2283 */
2284#endif
2285
2286 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2287 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2288 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2289 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2290
67c8e7f4
DSH		 2291 /* If status request then ask callback what to do.
2292 * Note: this must be called after servername callbacks in case
2293 * the certificate has changed.
2294 */
2bd45dc9 2295 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
67c8e7f4
DSH		 2296 {
2297 int r;
2298 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2299 switch (r)
2300 {
2301 /* We don't want to send a status request response */
2302 case SSL_TLSEXT_ERR_NOACK:
2303 s->tlsext_status_expected = 0;
2304 break;
2305 /* status request response should be sent */
2306 case SSL_TLSEXT_ERR_OK:
2307 if (s->tlsext_ocsp_resp)
2308 s->tlsext_status_expected = 1;
2309 else
2310 s->tlsext_status_expected = 0;
2311 break;
2312 /* something bad happened */
2313 case SSL_TLSEXT_ERR_ALERT_FATAL:
2314 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2315 al = SSL_AD_INTERNAL_ERROR;
2316 goto err;
2317 }
2318 }
2319 else
2320 s->tlsext_status_expected = 0;
761772d7
BM		 2321
2322#ifdef TLSEXT_TYPE_opaque_prf_input
2323 {
2324 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2325 * but we might be sending an alert in response to the client hello,
2326 * so this has to happen here in ssl_check_clienthello_tlsext(). */
2327
2328 int r = 1;
2329
2330 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2331 {
2332 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2333 if (!r)
2334 {
2335 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2336 al = SSL_AD_INTERNAL_ERROR;
2337 goto err;
2338 }
2339 }
2340
2341 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2342 OPENSSL_free(s->s3->server_opaque_prf_input);
2343 s->s3->server_opaque_prf_input = NULL;
2344
2345 if (s->tlsext_opaque_prf_input != NULL)
2346 {
2347 if (s->s3->client_opaque_prf_input != NULL &&
2348 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2349 {
2350 /* can only use this extension if we have a server opaque PRF input
2351 * of the same length as the client opaque PRF input! */
2352
02c27b11
BM		 2353 if (s->tlsext_opaque_prf_input_len == 0)
2354 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2355 else
2356 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
761772d7
BM		 2357 if (s->s3->server_opaque_prf_input == NULL)
2358 {
2359 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2360 al = SSL_AD_INTERNAL_ERROR;
2361 goto err;
2362 }
2363 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2364 }
2365 }
2366
2367 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2368 {
2369 /* The callback wants to enforce use of the extension,
2370 * but we can't do that with the client opaque PRF input;
2371 * abort the handshake.
2372 */
2373 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2374 al = SSL_AD_HANDSHAKE_FAILURE;
2375 }
2376 }
761772d7 2377
67c8e7f4 2378#endif
761772d7 2379 err:
52b8dad8
BM		 2380 switch (ret)
2381 {
36ca4ba6
BM		 2382 case SSL_TLSEXT_ERR_ALERT_FATAL:
2383 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2384 return -1;
2385
2386 case SSL_TLSEXT_ERR_ALERT_WARNING:
2387 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2388 return 1;
2389
2390 case SSL_TLSEXT_ERR_NOACK:
2391 s->servername_done=0;
2392 default:
2393 return 1;
52b8dad8 2394 }
36ca4ba6 2395 }
f1fd4544 2396
36ca4ba6
BM		 2397int ssl_check_serverhello_tlsext(SSL *s)
2398 {
2399 int ret=SSL_TLSEXT_ERR_NOACK;
58ece833 2400 int al = SSL_AD_UNRECOGNIZED_NAME;
241520e6 2401
36ca4ba6 2402#ifndef OPENSSL_NO_EC
d0205686
DSH		 2403 /* If we are client and using an elliptic curve cryptography cipher
2404 * suite, then if server returns an EC point formats lists extension
2405 * it must contain uncompressed.
36ca4ba6 2406 */
52b8dad8
BM		 2407 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2408 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
36ca4ba6 2409 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
d0205686 2410 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
52b8dad8 2411 ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
36ca4ba6
BM		 2412 {
2413 /* we are using an ECC cipher */
90bdfd97 2414 size_t i;
36ca4ba6
BM		 2415 unsigned char *list;
2416 int found_uncompressed = 0;
b9865f11 2417 list = s->session->tlsext_ecpointformatlist;
36ca4ba6
BM		 2418 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2419 {
2420 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
2421 {
2422 found_uncompressed = 1;
2423 break;
2424 }
2425 }
2426 if (!found_uncompressed)
2427 {
a291745e 2428 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
36ca4ba6
BM		 2429 return -1;
2430 }
2431 }
2432 ret = SSL_TLSEXT_ERR_OK;
2433#endif /* OPENSSL_NO_EC */
2434
241520e6 2435 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
58ece833 2436 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
241520e6 2437 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
58ece833 2438 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
241520e6 2439
761772d7
BM		 2440#ifdef TLSEXT_TYPE_opaque_prf_input
2441 if (s->s3->server_opaque_prf_input_len > 0)
2442 {
2443 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
2444 * So first verify that we really have a value from the server too. */
2445
2446 if (s->s3->server_opaque_prf_input == NULL)
2447 {
2448 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2449 al = SSL_AD_HANDSHAKE_FAILURE;
2450 }
2451
2452 /* Anytime the server *has* sent an opaque PRF input, we need to check
2453 * that we have a client opaque PRF input of the same size. */
2454 if (s->s3->client_opaque_prf_input == NULL ||
2455 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
2456 {
2457 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2458 al = SSL_AD_ILLEGAL_PARAMETER;
2459 }
2460 }
2461#endif
2462
04e2ab2c
DSH		 2463 /* If we've requested certificate status and we wont get one
2464 * tell the callback
2465 */
2466 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
121f9e74 2467 && s->ctx && s->ctx->tlsext_status_cb)
04e2ab2c
DSH		 2468 {
2469 int r;
2470 /* Set resp to NULL, resplen to -1 so callback knows
2471 * there is no response.
2472 */
2473 if (s->tlsext_ocsp_resp)
2474 {
2475 OPENSSL_free(s->tlsext_ocsp_resp);
2476 s->tlsext_ocsp_resp = NULL;
2477 }
2478 s->tlsext_ocsp_resplen = -1;
2479 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2480 if (r == 0)
2481 {
2482 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2483 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2484 }
2485 if (r < 0)
2486 {
2487 al = SSL_AD_INTERNAL_ERROR;
2488 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2489 }
2490 }
2491
52b8dad8
BM		 2492 switch (ret)
2493 {
58ece833
BM		 2494 case SSL_TLSEXT_ERR_ALERT_FATAL:
2495 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2496 return -1;
2497
2498 case SSL_TLSEXT_ERR_ALERT_WARNING:
2499 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2500 return 1;
2501
2502 case SSL_TLSEXT_ERR_NOACK:
2503 s->servername_done=0;
2504 default:
2505 return 1;
52b8dad8 2506 }
f1fd4544 2507 }
33273721 2508
09e4e4b9
DSH		 2509int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2510 {
2511 int al = -1;
2512 if (s->version < SSL3_VERSION)
2513 return 1;
2514 if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
2515 {
2516 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2517 return 0;
2518 }
2519
2520 if (ssl_check_serverhello_tlsext(s) <= 0)
2521 {
2522 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
2523 return 0;
2524 }
2525 return 1;
2526}
2527
c519e89f
BM		 2528/* Since the server cache lookup is done early on in the processing of the
2529 * ClientHello, and other operations depend on the result, we need to handle
2530 * any TLS session ticket extension at the same time.
2531 *
2532 * session_id: points at the session ID in the ClientHello. This code will
2533 * read past the end of this in order to parse out the session ticket
2534 * extension, if any.
2535 * len: the length of the session ID.
2536 * limit: a pointer to the first byte after the ClientHello.
2537 * ret: (output) on return, if a ticket was decrypted, then this is set to
2538 * point to the resulting session.
2539 *
2540 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
2541 * ciphersuite, in which case we have no use for session tickets and one will
2542 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
2543 *
2544 * Returns:
2545 * -1: fatal error, either from parsing or decrypting the ticket.
2546 * 0: no ticket was found (or was ignored, based on settings).
2547 * 1: a zero length extension was found, indicating that the client supports
2548 * session tickets but doesn't currently have one to offer.
2549 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
2550 * couldn't be decrypted because of a non-fatal error.
2551 * 3: a ticket was successfully decrypted and *ret was set.
2552 *
2553 * Side effects:
2554 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
2555 * a new session ticket to the client because the client indicated support
2556 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
2557 * a session ticket or we couldn't use the one it gave us, or if
2558 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
2559 * Otherwise, s->tlsext_ticket_expected is set to 0.
6434abbf 2560 */
6434abbf 2561int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
c519e89f 2562 const unsigned char *limit, SSL_SESSION **ret)
6434abbf
DSH		 2563 {
2564 /* Point after session ID in client hello */
2565 const unsigned char *p = session_id + len;
2566 unsigned short i;
e8da6a1d 2567
c519e89f
BM		 2568 *ret = NULL;
2569 s->tlsext_ticket_expected = 0;
2570
e8da6a1d 2571 /* If tickets disabled behave as if no ticket present
c519e89f
BM		 2572 * to permit stateful resumption.
2573 */
e8da6a1d 2574 if (SSL_get_options(s) & SSL_OP_NO_TICKET)
c519e89f 2575 return 0;
6434abbf 2576 if ((s->version <= SSL3_VERSION) || !limit)
c519e89f 2577 return 0;
6434abbf
DSH		 2578 if (p >= limit)
2579 return -1;
07a9d1a2
DSH		 2580 /* Skip past DTLS cookie */
2581 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
2582 {
2583 i = *(p++);
2584 p+= i;
2585 if (p >= limit)
2586 return -1;
2587 }
6434abbf
DSH		 2588 /* Skip past cipher list */
2589 n2s(p, i);
2590 p+= i;
2591 if (p >= limit)
2592 return -1;
2593 /* Skip past compression algorithm list */
2594 i = *(p++);
2595 p += i;
2596 if (p > limit)
2597 return -1;
2598 /* Now at start of extensions */
2599 if ((p + 2) >= limit)
c519e89f 2600 return 0;
6434abbf
DSH		 2601 n2s(p, i);
2602 while ((p + 4) <= limit)
2603 {
2604 unsigned short type, size;
2605 n2s(p, type);
2606 n2s(p, size);
2607 if (p + size > limit)
c519e89f 2608 return 0;
6434abbf
DSH		 2609 if (type == TLSEXT_TYPE_session_ticket)
2610 {
c519e89f 2611 int r;
6434abbf
DSH		 2612 if (size == 0)
2613 {
c519e89f
BM		 2614 /* The client will accept a ticket but doesn't
2615 * currently have one. */
6434abbf 2616 s->tlsext_ticket_expected = 1;
c519e89f 2617 return 1;
6434abbf 2618 }
12bf56c0
DSH		 2619 if (s->tls_session_secret_cb)
2620 {
c519e89f
BM		 2621 /* Indicate that the ticket couldn't be
2622 * decrypted rather than generating the session
2623 * from ticket now, trigger abbreviated
2624 * handshake based on external mechanism to
2625 * calculate the master secret later. */
2626 return 2;
2627 }
2628 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
2629 switch (r)
2630 {
2631 case 2: /* ticket couldn't be decrypted */
2632 s->tlsext_ticket_expected = 1;
2633 return 2;
2634 case 3: /* ticket was decrypted */
2635 return r;
2636 case 4: /* ticket decrypted but need to renew */
2637 s->tlsext_ticket_expected = 1;
2638 return 3;
2639 default: /* fatal error */
2640 return -1;
12bf56c0 2641 }
6434abbf
DSH		 2642 }
2643 p += size;
2644 }
c519e89f 2645 return 0;
6434abbf
DSH		 2646 }
2647
c519e89f
BM		 2648/* tls_decrypt_ticket attempts to decrypt a session ticket.
2649 *
2650 * etick: points to the body of the session ticket extension.
2651 * eticklen: the length of the session tickets extenion.
2652 * sess_id: points at the session ID.
2653 * sesslen: the length of the session ID.
2654 * psess: (output) on return, if a ticket was decrypted, then this is set to
2655 * point to the resulting session.
2656 *
2657 * Returns:
2658 * -1: fatal error, either from parsing or decrypting the ticket.
2659 * 2: the ticket couldn't be decrypted.
2660 * 3: a ticket was successfully decrypted and *psess was set.
2661 * 4: same as 3, but the ticket needs to be renewed.
2662 */
6434abbf
DSH		 2663static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
2664 const unsigned char *sess_id, int sesslen,
2665 SSL_SESSION **psess)
2666 {
2667 SSL_SESSION *sess;
2668 unsigned char *sdec;
2669 const unsigned char *p;
8a2062fe 2670 int slen, mlen, renew_ticket = 0;
6434abbf
DSH		 2671 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
2672 HMAC_CTX hctx;
2673 EVP_CIPHER_CTX ctx;
661dc143 2674 SSL_CTX *tctx = s->initial_ctx;
8a2062fe
DSH		 2675 /* Need at least keyname + iv + some encrypted data */
2676 if (eticklen < 48)
c519e89f 2677 return 2;
8a2062fe
DSH		 2678 /* Initialize session ticket encryption and HMAC contexts */
2679 HMAC_CTX_init(&hctx);
2680 EVP_CIPHER_CTX_init(&ctx);
661dc143 2681 if (tctx->tlsext_ticket_key_cb)
8a2062fe
DSH		 2682 {
2683 unsigned char *nctick = (unsigned char *)etick;
661dc143 2684 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
8a2062fe
DSH		 2685 &ctx, &hctx, 0);
2686 if (rv < 0)
2687 return -1;
2688 if (rv == 0)
c519e89f 2689 return 2;
8a2062fe
DSH		 2690 if (rv == 2)
2691 renew_ticket = 1;
2692 }
2693 else
2694 {
2695 /* Check key name matches */
661dc143 2696 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
c519e89f 2697 return 2;
661dc143 2698 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
8a2062fe
DSH		 2699 tlsext_tick_md(), NULL);
2700 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
661dc143 2701 tctx->tlsext_tick_aes_key, etick + 16);
8a2062fe 2702 }
6434abbf 2703 /* Attempt to process session ticket, first conduct sanity and
c519e89f
BM		 2704 * integrity checks on ticket.
2705 */
8a2062fe 2706 mlen = HMAC_size(&hctx);
0eab41fb
BL		 2707 if (mlen < 0)
2708 {
2709 EVP_CIPHER_CTX_cleanup(&ctx);
2710 return -1;
2711 }
6434abbf 2712 eticklen -= mlen;
6434abbf 2713 /* Check HMAC of encrypted ticket */
6434abbf
DSH		 2714 HMAC_Update(&hctx, etick, eticklen);
2715 HMAC_Final(&hctx, tick_hmac, NULL);
2716 HMAC_CTX_cleanup(&hctx);
2717 if (memcmp(tick_hmac, etick + eticklen, mlen))
c519e89f 2718 return 2;
6434abbf 2719 /* Attempt to decrypt session data */
6434abbf 2720 /* Move p after IV to start of encrypted ticket, update length */
8a2062fe
DSH		 2721 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
2722 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
6434abbf
DSH		 2723 sdec = OPENSSL_malloc(eticklen);
2724 if (!sdec)
2725 {
2726 EVP_CIPHER_CTX_cleanup(&ctx);
2727 return -1;
2728 }
2729 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
2730 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
c519e89f 2731 return 2;
6434abbf
DSH		 2732 slen += mlen;
2733 EVP_CIPHER_CTX_cleanup(&ctx);
2734 p = sdec;
c519e89f 2735
6434abbf
DSH		 2736 sess = d2i_SSL_SESSION(NULL, &p, slen);
2737 OPENSSL_free(sdec);
2738 if (sess)
2739 {
c519e89f
BM		 2740 /* The session ID, if non-empty, is used by some clients to
2741 * detect that the ticket has been accepted. So we copy it to
2742 * the session structure. If it is empty set length to zero
2743 * as required by standard.
2744 */
6434abbf
DSH		 2745 if (sesslen)
2746 memcpy(sess->session_id, sess_id, sesslen);
2747 sess->session_id_length = sesslen;
2748 *psess = sess;
c519e89f
BM		 2749 if (renew_ticket)
2750 return 4;
2751 else
2752 return 3;
6434abbf 2753 }
c519e89f
BM		 2754 ERR_clear_error();
2755 /* For session parse failure, indicate that we need to send a new
2756 * ticket. */
2757 return 2;
6434abbf 2758 }
6434abbf 2759
6b7be581
DSH		 2760/* Tables to translate from NIDs to TLS v1.2 ids */
2761
2762typedef struct
2763 {
2764 int nid;
2765 int id;
2766 } tls12_lookup;
2767
2768static tls12_lookup tls12_md[] = {
6b7be581 2769 {NID_md5, TLSEXT_hash_md5},
6b7be581 2770 {NID_sha1, TLSEXT_hash_sha1},
6b7be581
DSH		 2771 {NID_sha224, TLSEXT_hash_sha224},
2772 {NID_sha256, TLSEXT_hash_sha256},
6b7be581
DSH		 2773 {NID_sha384, TLSEXT_hash_sha384},
2774 {NID_sha512, TLSEXT_hash_sha512}
6b7be581
DSH		 2775};
2776
2777static tls12_lookup tls12_sig[] = {
6b7be581 2778 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
6b7be581 2779 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
6b7be581 2780 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
6b7be581
DSH		 2781};
2782
2783static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
2784 {
2785 size_t i;
2786 for (i = 0; i < tlen; i++)
2787 {
2788 if (table[i].nid == nid)
2789 return table[i].id;
2790 }
2791 return -1;
2792 }
e7f8ff43 2793
6b7be581
DSH		 2794static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
2795 {
2796 size_t i;
2797 for (i = 0; i < tlen; i++)
2798 {
e7f8ff43 2799 if ((table[i].id) == id)
6b7be581
DSH		 2800 return table[i].nid;
2801 }
e7f8ff43 2802 return NID_undef;
6b7be581 2803 }
a2f9200f
DSH		 2804
2805int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
6b7be581
DSH		 2806 {
2807 int sig_id, md_id;
1db5f356
DSH		 2808 if (!md)
2809 return 0;
6b7be581
DSH		 2810 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
2811 sizeof(tls12_md)/sizeof(tls12_lookup));
2812 if (md_id == -1)
2813 return 0;
a2f9200f 2814 sig_id = tls12_get_sigid(pk);
6b7be581
DSH		 2815 if (sig_id == -1)
2816 return 0;
2817 p[0] = (unsigned char)md_id;
2818 p[1] = (unsigned char)sig_id;
2819 return 1;
2820 }
2821
a2f9200f
DSH		 2822int tls12_get_sigid(const EVP_PKEY *pk)
2823 {
2824 return tls12_find_id(pk->type, tls12_sig,
2825 sizeof(tls12_sig)/sizeof(tls12_lookup));
2826 }
2827
2828const EVP_MD *tls12_get_hash(unsigned char hash_alg)
2829 {
2830 switch(hash_alg)
2831 {
2832#ifndef OPENSSL_NO_MD5
2833 case TLSEXT_hash_md5:
ebc5e72f
DSH		 2834#ifdef OPENSSL_FIPS
2835 if (FIPS_mode())
2836 return NULL;
2837#endif
a2f9200f
DSH		 2838 return EVP_md5();
2839#endif
2840#ifndef OPENSSL_NO_SHA
2841 case TLSEXT_hash_sha1:
2842 return EVP_sha1();
2843#endif
2844#ifndef OPENSSL_NO_SHA256
2845 case TLSEXT_hash_sha224:
2846 return EVP_sha224();
2847
2848 case TLSEXT_hash_sha256:
2849 return EVP_sha256();
2850#endif
2851#ifndef OPENSSL_NO_SHA512
2852 case TLSEXT_hash_sha384:
2853 return EVP_sha384();
2854
2855 case TLSEXT_hash_sha512:
2856 return EVP_sha512();
2857#endif
2858 default:
2859 return NULL;
2860
2861 }
2862 }
2863
6b7be581
DSH		 2864/* Set preferred digest for each key type */
2865
8f829124 2866int tls1_process_sigalgs(SSL *s, const unsigned char *data, int dsize)
6b7be581
DSH		 2867 {
2868 int i, idx;
2869 const EVP_MD *md;
2870 CERT *c = s->cert;
e7f8ff43 2871 TLS_SIGALGS *sigptr;
6b7be581 2872 /* Extension ignored for TLS versions below 1.2 */
238b6361 2873 if (TLS1_get_version(s) < TLS1_2_VERSION)
6b7be581 2874 return 1;
8f829124
DSH		 2875 /* Should never happen */
2876 if (!c)
2877 return 0;
6b7be581
DSH		 2878
2879 c->pkeys[SSL_PKEY_DSA_SIGN].digest = NULL;
2880 c->pkeys[SSL_PKEY_RSA_SIGN].digest = NULL;
2881 c->pkeys[SSL_PKEY_RSA_ENC].digest = NULL;
2882 c->pkeys[SSL_PKEY_ECC].digest = NULL;
2883
0f229cce
DSH		 2884 if (c->peer_sigalgs)
2885 OPENSSL_free(c->peer_sigalgs);
2886 c->peer_sigalgs = OPENSSL_malloc((dsize/2) * sizeof(TLS_SIGALGS));
2887 if (!c->peer_sigalgs)
e7f8ff43 2888 return 0;
0f229cce 2889 c->peer_sigalgslen = dsize/2;
6b7be581 2890
0f229cce 2891 for (i = 0, sigptr = c->peer_sigalgs; i < dsize; i += 2, sigptr++)
e7f8ff43
DSH		 2892 {
2893 sigptr->rhash = data[i];
2894 sigptr->rsign = data[i + 1];
2895 sigptr->hash_nid = tls12_find_nid(sigptr->rhash, tls12_md,
2896 sizeof(tls12_md)/sizeof(tls12_lookup));
2897 sigptr->sign_nid = tls12_find_nid(sigptr->rsign, tls12_sig,
2898 sizeof(tls12_sig)/sizeof(tls12_lookup));
2899 if (!OBJ_find_sigid_by_algs(&sigptr->signandhash_nid,
2900 sigptr->hash_nid,
2901 sigptr->sign_nid))
2902 sigptr->signandhash_nid = NID_undef;
2903 switch(sigptr->rsign)
6b7be581
DSH		 2904 {
2905#ifndef OPENSSL_NO_RSA
2906 case TLSEXT_signature_rsa:
2907 idx = SSL_PKEY_RSA_SIGN;
2908 break;
2909#endif
2910#ifndef OPENSSL_NO_DSA
2911 case TLSEXT_signature_dsa:
2912 idx = SSL_PKEY_DSA_SIGN;
2913 break;
2914#endif
2915#ifndef OPENSSL_NO_ECDSA
2916 case TLSEXT_signature_ecdsa:
2917 idx = SSL_PKEY_ECC;
2918 break;
2919#endif
2920 default:
2921 continue;
2922 }
2923
a2f9200f 2924 if (c->pkeys[idx].digest == NULL)
6b7be581 2925 {
e7f8ff43 2926 md = tls12_get_hash(sigptr->rhash);
a2f9200f
DSH		 2927 if (md)
2928 {
2929 c->pkeys[idx].digest = md;
2930 if (idx == SSL_PKEY_RSA_SIGN)
2931 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
2932 }
6b7be581
DSH		 2933 }
2934
6b7be581
DSH		 2935 }
2936
8f829124 2937
6b7be581
DSH		 2938 /* Set any remaining keys to default values. NOTE: if alg is not
2939 * supported it stays as NULL.
2940 */
2941#ifndef OPENSSL_NO_DSA
2942 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
2943 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_dss1();
2944#endif
2945#ifndef OPENSSL_NO_RSA
2946 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
2947 {
2948 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
2949 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
2950 }
2951#endif
2952#ifndef OPENSSL_NO_ECDSA
2953 if (!c->pkeys[SSL_PKEY_ECC].digest)
2954 c->pkeys[SSL_PKEY_ECC].digest = EVP_ecdsa();
2955#endif
2956 return 1;
2957 }
2958
6434abbf 2959#endif
4817504d 2960
e7f8ff43
DSH		 2961int SSL_get_sigalgs(SSL *s, int idx,
2962 int *psign, int *phash, int *psignandhash,
2963 unsigned char *rsig, unsigned char *rhash)
2964 {
0f229cce 2965 if (s->cert->peer_sigalgs == NULL)
e7f8ff43
DSH		 2966 return 0;
2967 if (idx >= 0)
2968 {
2969 TLS_SIGALGS *psig;
0f229cce 2970 if (idx >= (int)s->cert->peer_sigalgslen)
e7f8ff43 2971 return 0;
0f229cce 2972 psig = s->cert->peer_sigalgs + idx;
e7f8ff43
DSH		 2973 if (psign)
2974 *psign = psig->sign_nid;
2975 if (phash)
2976 *phash = psig->hash_nid;
2977 if (psignandhash)
2978 *psignandhash = psig->signandhash_nid;
2979 if (rsig)
2980 *rsig = psig->rsign;
2981 if (rhash)
2982 *rhash = psig->rhash;
2983 }
0f229cce 2984 return s->cert->peer_sigalgslen;
e7f8ff43
DSH		 2985 }
2986
2987
4817504d
DSH		 2988#ifndef OPENSSL_NO_HEARTBEATS
2989int
2990tls1_process_heartbeat(SSL *s)
2991 {
2992 unsigned char *p = &s->s3->rrec.data[0], *pl;
2993 unsigned short hbtype;
2994 unsigned int payload;
2995 unsigned int padding = 16; /* Use minimum padding */
2996
2997 /* Read type and payload length first */
2998 hbtype = *p++;
2999 n2s(p, payload);
3000 pl = p;
3001
3002 if (s->msg_callback)
3003 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
3004 &s->s3->rrec.data[0], s->s3->rrec.length,
3005 s, s->msg_callback_arg);
3006
3007 if (hbtype == TLS1_HB_REQUEST)
3008 {
3009 unsigned char *buffer, *bp;
3010 int r;
3011
3012 /* Allocate memory for the response, size is 1 bytes
3013 * message type, plus 2 bytes payload length, plus
3014 * payload, plus padding
3015 */
3016 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
3017 bp = buffer;
3018
3019 /* Enter response type, length and copy payload */
3020 *bp++ = TLS1_HB_RESPONSE;
3021 s2n(payload, bp);
3022 memcpy(bp, pl, payload);
57cb030c
DSH		 3023 bp += payload;
3024 /* Random padding */
3025 RAND_pseudo_bytes(bp, padding);
3026
4817504d
DSH		 3027 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
3028
3029 if (r >= 0 && s->msg_callback)
3030 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3031 buffer, 3 + payload + padding,
3032 s, s->msg_callback_arg);
3033
3034 OPENSSL_free(buffer);
3035
3036 if (r < 0)
3037 return r;
3038 }
3039 else if (hbtype == TLS1_HB_RESPONSE)
3040 {
3041 unsigned int seq;
3042
3043 /* We only send sequence numbers (2 bytes unsigned int),
3044 * and 16 random bytes, so we just try to read the
3045 * sequence number */
3046 n2s(pl, seq);
3047
3048 if (payload == 18 && seq == s->tlsext_hb_seq)
3049 {
3050 s->tlsext_hb_seq++;
3051 s->tlsext_hb_pending = 0;
3052 }
3053 }
3054
3055 return 0;
3056 }
3057
3058int
3059tls1_heartbeat(SSL *s)
3060 {
3061 unsigned char *buf, *p;
3062 int ret;
3063 unsigned int payload = 18; /* Sequence number + random bytes */
3064 unsigned int padding = 16; /* Use minimum padding */
3065
3066 /* Only send if peer supports and accepts HB requests... */
3067 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
3068 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
3069 {
3070 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
3071 return -1;
3072 }
3073
3074 /* ...and there is none in flight yet... */
3075 if (s->tlsext_hb_pending)
3076 {
3077 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
3078 return -1;
3079 }
3080
3081 /* ...and no handshake in progress. */
3082 if (SSL_in_init(s) || s->in_handshake)
3083 {
3084 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
3085 return -1;
3086 }
3087
3088 /* Check if padding is too long, payload and padding
3089 * must not exceed 2^14 - 3 = 16381 bytes in total.
3090 */
3091 OPENSSL_assert(payload + padding <= 16381);
3092
3093 /* Create HeartBeat message, we just use a sequence number
3094 * as payload to distuingish different messages and add
3095 * some random stuff.
3096 * - Message Type, 1 byte
3097 * - Payload Length, 2 bytes (unsigned int)
3098 * - Payload, the sequence number (2 bytes uint)
3099 * - Payload, random bytes (16 bytes uint)
3100 * - Padding
3101 */
3102 buf = OPENSSL_malloc(1 + 2 + payload + padding);
3103 p = buf;
3104 /* Message Type */
3105 *p++ = TLS1_HB_REQUEST;
3106 /* Payload length (18 bytes here) */
3107 s2n(payload, p);
3108 /* Sequence number */
3109 s2n(s->tlsext_hb_seq, p);
3110 /* 16 random bytes */
3111 RAND_pseudo_bytes(p, 16);
3112 p += 16;
3113 /* Random padding */
3114 RAND_pseudo_bytes(p, padding);
3115
3116 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
3117 if (ret >= 0)
3118 {
3119 if (s->msg_callback)
3120 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3121 buf, 3 + payload + padding,
3122 s, s->msg_callback_arg);
3123
3124 s->tlsext_hb_pending = 1;
3125 }
3126
3127 OPENSSL_free(buf);
3128
3129 return ret;
3130 }
3131#endif
0f229cce
DSH		 3132
3133#define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num *2)
3134
3135typedef struct
3136 {
3137 size_t sigalgcnt;
3138 int sigalgs[MAX_SIGALGLEN];
3139 } sig_cb_st;
3140
3141static int sig_cb(const char *elem, int len, void *arg)
3142 {
3143 sig_cb_st *sarg = arg;
3144 size_t i;
3145 char etmp[20], *p;
3146 int sig_alg, hash_alg;
3147 if (sarg->sigalgcnt == MAX_SIGALGLEN)
3148 return 0;
3149 if (len > (int)(sizeof(etmp) - 1))
3150 return 0;
3151 memcpy(etmp, elem, len);
3152 etmp[len] = 0;
3153 p = strchr(etmp, '+');
3154 if (!p)
3155 return 0;
3156 *p = 0;
3157 p++;
3158 if (!*p)
3159 return 0;
3160
3161 if (!strcmp(etmp, "RSA"))
3162 sig_alg = EVP_PKEY_RSA;
3163 else if (!strcmp(etmp, "DSA"))
3164 sig_alg = EVP_PKEY_DSA;
3165 else if (!strcmp(etmp, "ECDSA"))
3166 sig_alg = EVP_PKEY_EC;
3167 else return 0;
3168
3169 hash_alg = OBJ_sn2nid(p);
3170 if (hash_alg == NID_undef)
3171 hash_alg = OBJ_ln2nid(p);
3172 if (hash_alg == NID_undef)
3173 return 0;
3174
3175 for (i = 0; i < sarg->sigalgcnt; i+=2)
3176 {
3177 if (sarg->sigalgs[i] == sig_alg
3178 && sarg->sigalgs[i + 1] == hash_alg)
3179 return 0;
3180 }
3181 sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
3182 sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
3183 return 1;
3184 }
3185
3186/* Set suppored signature algorithms based on a colon separated list
3187 * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
3188int tls1_set_sigalgs_list(CERT *c, const char *str)
3189 {
3190 sig_cb_st sig;
3191 sig.sigalgcnt = 0;
3192 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
3193 return 0;
3194 return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt);
3195 }
3196
3197int tls1_set_sigalgs(CERT *c, const int *salg, size_t salglen)
3198 {
3199 TLS_SIGALGS *sigalgs, *sptr;
3200 int rhash, rsign;
3201 size_t i;
3202 if (salglen & 1)
3203 return 0;
3204 salglen /= 2;
3205 sigalgs = OPENSSL_malloc(sizeof(TLS_SIGALGS) * salglen);
3206 if (sigalgs == NULL)
3207 return 0;
3208 for (i = 0, sptr = sigalgs; i < salglen; i++, sptr++)
3209 {
3210 sptr->hash_nid = *salg++;
3211 sptr->sign_nid = *salg++;
3212 rhash = tls12_find_id(sptr->hash_nid, tls12_md,
3213 sizeof(tls12_md)/sizeof(tls12_lookup));
3214 rsign = tls12_find_id(sptr->sign_nid, tls12_sig,
3215 sizeof(tls12_sig)/sizeof(tls12_lookup));
3216
3217 if (rhash == -1 || rsign == -1)
3218 goto err;
3219
3220 if (!OBJ_find_sigid_by_algs(&sptr->signandhash_nid,
3221 sptr->hash_nid,
3222 sptr->sign_nid))
3223 sptr->signandhash_nid = NID_undef;
3224 sptr->rhash = rhash;
3225 sptr->rsign = rsign;
3226 }
3227
3228 if (c->conf_sigalgs)
3229 OPENSSL_free(c->conf_sigalgs);
3230
3231 c->conf_sigalgs = sigalgs;
3232 c->conf_sigalgslen = salglen;
3233 return 1;
3234
3235 err:
3236 OPENSSL_free(sigalgs);
3237 return 0;
3238 }
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