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Reject elliptic curve lists of odd lengths.
[thirdparty/openssl.git] / ssl / t1_lib.c
CommitLineData
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>
09599b52
DSH		 118#ifndef OPENSSL_NO_DH
119#include <openssl/dh.h>
120#include <openssl/bn.h>
121#endif
58964a49
RE		 122#include "ssl_locl.h"
123
42182852 124const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
58964a49 125
367eb1f1 126#ifndef OPENSSL_NO_TLSEXT
6434abbf
DSH		 127static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
128 const unsigned char *sess_id, int sesslen,
129 SSL_SESSION **psess);
2daceb03 130static int ssl_check_clienthello_tlsext_early(SSL *s);
09e4e4b9 131int ssl_check_serverhello_tlsext(SSL *s);
367eb1f1 132#endif
6434abbf 133
161e0a61 134SSL3_ENC_METHOD const TLSv1_enc_data={
58964a49
RE		 135 tls1_enc,
136 tls1_mac,
137 tls1_setup_key_block,
138 tls1_generate_master_secret,
139 tls1_change_cipher_state,
140 tls1_final_finish_mac,
141 TLS1_FINISH_MAC_LENGTH,
142 tls1_cert_verify_mac,
143 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
144 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
145 tls1_alert_code,
e0af0405 146 tls1_export_keying_material,
173e72e6
DSH		 147 0,
148 SSL3_HM_HEADER_LENGTH,
149 ssl3_set_handshake_header,
150 ssl3_handshake_write
151 };
152
161e0a61 153SSL3_ENC_METHOD const TLSv1_1_enc_data={
173e72e6
DSH		 154 tls1_enc,
155 tls1_mac,
156 tls1_setup_key_block,
157 tls1_generate_master_secret,
158 tls1_change_cipher_state,
159 tls1_final_finish_mac,
160 TLS1_FINISH_MAC_LENGTH,
161 tls1_cert_verify_mac,
162 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
163 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
164 tls1_alert_code,
165 tls1_export_keying_material,
166 SSL_ENC_FLAG_EXPLICIT_IV,
167 SSL3_HM_HEADER_LENGTH,
168 ssl3_set_handshake_header,
169 ssl3_handshake_write
170 };
171
161e0a61 172SSL3_ENC_METHOD const TLSv1_2_enc_data={
173e72e6
DSH		 173 tls1_enc,
174 tls1_mac,
175 tls1_setup_key_block,
176 tls1_generate_master_secret,
177 tls1_change_cipher_state,
178 tls1_final_finish_mac,
179 TLS1_FINISH_MAC_LENGTH,
180 tls1_cert_verify_mac,
181 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
182 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
183 tls1_alert_code,
184 tls1_export_keying_material,
4221c0dd
DSH		 185 SSL_ENC_FLAG_EXPLICIT_IV|SSL_ENC_FLAG_SIGALGS|SSL_ENC_FLAG_SHA256_PRF
186 |SSL_ENC_FLAG_TLS1_2_CIPHERS,
173e72e6
DSH		 187 SSL3_HM_HEADER_LENGTH,
188 ssl3_set_handshake_header,
189 ssl3_handshake_write
58964a49
RE		 190 };
191
f3b656b2 192long tls1_default_timeout(void)
58964a49
RE		 193 {
194 /* 2 hours, the 24 hours mentioned in the TLSv1 spec
195 * is way too long for http, the cache would over fill */
196 return(60*60*2);
197 }
198
6b691a5c 199int tls1_new(SSL *s)
58964a49
RE		 200 {
201 if (!ssl3_new(s)) return(0);
202 s->method->ssl_clear(s);
203 return(1);
204 }
205
6b691a5c 206void tls1_free(SSL *s)
58964a49 207 {
12bf56c0
DSH		 208#ifndef OPENSSL_NO_TLSEXT
209 if (s->tlsext_session_ticket)
210 {
211 OPENSSL_free(s->tlsext_session_ticket);
212 }
213#endif /* OPENSSL_NO_TLSEXT */
58964a49
RE		 214 ssl3_free(s);
215 }
216
6b691a5c 217void tls1_clear(SSL *s)
58964a49
RE		 218 {
219 ssl3_clear(s);
637f374a 220 s->version = s->method->version;
58964a49
RE		 221 }
222
525de5d3 223#ifndef OPENSSL_NO_EC
eda3766b 224
b362ccab
DSH		 225typedef struct
226 {
227 int nid; /* Curve NID */
228 int secbits; /* Bits of security (from SP800-57) */
229 unsigned int flags; /* Flags: currently just field type */
230 } tls_curve_info;
231
232#define TLS_CURVE_CHAR2 0x1
233#define TLS_CURVE_PRIME 0x0
234
f756fb43 235static const tls_curve_info nid_list[] =
525de5d3 236 {
b362ccab
DSH		 237 {NID_sect163k1, 80, TLS_CURVE_CHAR2},/* sect163k1 (1) */
238 {NID_sect163r1, 80, TLS_CURVE_CHAR2},/* sect163r1 (2) */
239 {NID_sect163r2, 80, TLS_CURVE_CHAR2},/* sect163r2 (3) */
240 {NID_sect193r1, 80, TLS_CURVE_CHAR2},/* sect193r1 (4) */
241 {NID_sect193r2, 80, TLS_CURVE_CHAR2},/* sect193r2 (5) */
242 {NID_sect233k1, 112, TLS_CURVE_CHAR2},/* sect233k1 (6) */
243 {NID_sect233r1, 112, TLS_CURVE_CHAR2},/* sect233r1 (7) */
244 {NID_sect239k1, 112, TLS_CURVE_CHAR2},/* sect239k1 (8) */
245 {NID_sect283k1, 128, TLS_CURVE_CHAR2},/* sect283k1 (9) */
246 {NID_sect283r1, 128, TLS_CURVE_CHAR2},/* sect283r1 (10) */
247 {NID_sect409k1, 192, TLS_CURVE_CHAR2},/* sect409k1 (11) */
248 {NID_sect409r1, 192, TLS_CURVE_CHAR2},/* sect409r1 (12) */
249 {NID_sect571k1, 256, TLS_CURVE_CHAR2},/* sect571k1 (13) */
250 {NID_sect571r1, 256, TLS_CURVE_CHAR2},/* sect571r1 (14) */
251 {NID_secp160k1, 80, TLS_CURVE_PRIME},/* secp160k1 (15) */
252 {NID_secp160r1, 80, TLS_CURVE_PRIME},/* secp160r1 (16) */
253 {NID_secp160r2, 80, TLS_CURVE_PRIME},/* secp160r2 (17) */
254 {NID_secp192k1, 80, TLS_CURVE_PRIME},/* secp192k1 (18) */
255 {NID_X9_62_prime192v1, 80, TLS_CURVE_PRIME},/* secp192r1 (19) */
256 {NID_secp224k1, 112, TLS_CURVE_PRIME},/* secp224k1 (20) */
257 {NID_secp224r1, 112, TLS_CURVE_PRIME},/* secp224r1 (21) */
258 {NID_secp256k1, 128, TLS_CURVE_PRIME},/* secp256k1 (22) */
259 {NID_X9_62_prime256v1, 128, TLS_CURVE_PRIME},/* secp256r1 (23) */
260 {NID_secp384r1, 192, TLS_CURVE_PRIME},/* secp384r1 (24) */
261 {NID_secp521r1, 256, TLS_CURVE_PRIME},/* secp521r1 (25) */
262 {NID_brainpoolP256r1, 128, TLS_CURVE_PRIME}, /* brainpoolP256r1 (26) */
263 {NID_brainpoolP384r1, 192, TLS_CURVE_PRIME}, /* brainpoolP384r1 (27) */
264 {NID_brainpoolP512r1, 256, TLS_CURVE_PRIME},/* brainpool512r1 (28) */
525de5d3 265 };
eda3766b 266
d0595f17
DSH		 267
268static const unsigned char ecformats_default[] =
eda3766b 269 {
d0595f17
DSH		 270 TLSEXT_ECPOINTFORMAT_uncompressed,
271 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime,
272 TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2
273 };
274
275static const unsigned char eccurves_default[] =
276 {
277 0,14, /* sect571r1 (14) */
278 0,13, /* sect571k1 (13) */
279 0,25, /* secp521r1 (25) */
c2c76a4d 280 0,28, /* brainpool512r1 (28) */
d0595f17
DSH		 281 0,11, /* sect409k1 (11) */
282 0,12, /* sect409r1 (12) */
c2c76a4d 283 0,27, /* brainpoolP384r1 (27) */
d0595f17
DSH		 284 0,24, /* secp384r1 (24) */
285 0,9, /* sect283k1 (9) */
286 0,10, /* sect283r1 (10) */
c2c76a4d 287 0,26, /* brainpoolP256r1 (26) */
d0595f17
DSH		 288 0,22, /* secp256k1 (22) */
289 0,23, /* secp256r1 (23) */
290 0,8, /* sect239k1 (8) */
291 0,6, /* sect233k1 (6) */
292 0,7, /* sect233r1 (7) */
293 0,20, /* secp224k1 (20) */
294 0,21, /* secp224r1 (21) */
295 0,4, /* sect193r1 (4) */
296 0,5, /* sect193r2 (5) */
297 0,18, /* secp192k1 (18) */
298 0,19, /* secp192r1 (19) */
299 0,1, /* sect163k1 (1) */
300 0,2, /* sect163r1 (2) */
301 0,3, /* sect163r2 (3) */
302 0,15, /* secp160k1 (15) */
303 0,16, /* secp160r1 (16) */
304 0,17, /* secp160r2 (17) */
eda3766b
DSH		 305 };
306
2ea80354
DSH		 307static const unsigned char suiteb_curves[] =
308 {
309 0, TLSEXT_curve_P_256,
310 0, TLSEXT_curve_P_384
311 };
312
525de5d3
DSH		 313int tls1_ec_curve_id2nid(int curve_id)
314 {
bcb245a7 315 /* ECC curves from RFC 4492 and RFC 7027 */
1e26a8ba
GT		 316 if ((curve_id < 1) || ((unsigned int)curve_id >
317 sizeof(nid_list)/sizeof(nid_list[0])))
318 return 0;
b362ccab 319 return nid_list[curve_id-1].nid;
525de5d3
DSH		 320 }
321
322int tls1_ec_nid2curve_id(int nid)
323 {
bcb245a7 324 /* ECC curves from RFC 4492 and RFC 7027 */
525de5d3
DSH		 325 switch (nid)
326 {
327 case NID_sect163k1: /* sect163k1 (1) */
328 return 1;
329 case NID_sect163r1: /* sect163r1 (2) */
330 return 2;
331 case NID_sect163r2: /* sect163r2 (3) */
332 return 3;
333 case NID_sect193r1: /* sect193r1 (4) */
334 return 4;
335 case NID_sect193r2: /* sect193r2 (5) */
336 return 5;
337 case NID_sect233k1: /* sect233k1 (6) */
338 return 6;
339 case NID_sect233r1: /* sect233r1 (7) */
340 return 7;
341 case NID_sect239k1: /* sect239k1 (8) */
342 return 8;
343 case NID_sect283k1: /* sect283k1 (9) */
344 return 9;
345 case NID_sect283r1: /* sect283r1 (10) */
346 return 10;
347 case NID_sect409k1: /* sect409k1 (11) */
348 return 11;
349 case NID_sect409r1: /* sect409r1 (12) */
350 return 12;
351 case NID_sect571k1: /* sect571k1 (13) */
352 return 13;
353 case NID_sect571r1: /* sect571r1 (14) */
354 return 14;
355 case NID_secp160k1: /* secp160k1 (15) */
356 return 15;
357 case NID_secp160r1: /* secp160r1 (16) */
358 return 16;
359 case NID_secp160r2: /* secp160r2 (17) */
360 return 17;
361 case NID_secp192k1: /* secp192k1 (18) */
362 return 18;
363 case NID_X9_62_prime192v1: /* secp192r1 (19) */
364 return 19;
365 case NID_secp224k1: /* secp224k1 (20) */
366 return 20;
367 case NID_secp224r1: /* secp224r1 (21) */
368 return 21;
369 case NID_secp256k1: /* secp256k1 (22) */
370 return 22;
371 case NID_X9_62_prime256v1: /* secp256r1 (23) */
372 return 23;
373 case NID_secp384r1: /* secp384r1 (24) */
374 return 24;
375 case NID_secp521r1: /* secp521r1 (25) */
376 return 25;
6699cb84
DSH		 377 case NID_brainpoolP256r1: /* brainpoolP256r1 (26) */
378 return 26;
379 case NID_brainpoolP384r1: /* brainpoolP384r1 (27) */
380 return 27;
381 case NID_brainpoolP512r1: /* brainpool512r1 (28) */
382 return 28;
525de5d3
DSH		 383 default:
384 return 0;
385 }
386 }
fd2b65ce
DSH		 387/* Get curves list, if "sess" is set return client curves otherwise
388 * preferred list
389 */
390static void tls1_get_curvelist(SSL *s, int sess,
391 const unsigned char **pcurves,
392 size_t *pcurveslen)
393 {
394 if (sess)
395 {
396 *pcurves = s->session->tlsext_ellipticcurvelist;
397 *pcurveslen = s->session->tlsext_ellipticcurvelist_length;
2ea80354 398 return;
fd2b65ce 399 }
2ea80354
DSH		 400 /* For Suite B mode only include P-256, P-384 */
401 switch (tls1_suiteb(s))
fd2b65ce 402 {
2ea80354 403 case SSL_CERT_FLAG_SUITEB_128_LOS:
2ea80354 404 *pcurves = suiteb_curves;
d372d365 405 *pcurveslen = sizeof(suiteb_curves);
2ea80354
DSH		 406 break;
407
b34aa49c
DSH		 408 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
409 *pcurves = suiteb_curves;
410 *pcurveslen = 2;
411 break;
412
2ea80354
DSH		 413 case SSL_CERT_FLAG_SUITEB_192_LOS:
414 *pcurves = suiteb_curves + 2;
415 *pcurveslen = 2;
416 break;
417 default:
fd2b65ce
DSH		 418 *pcurves = s->tlsext_ellipticcurvelist;
419 *pcurveslen = s->tlsext_ellipticcurvelist_length;
420 }
fd2b65ce
DSH		 421 if (!*pcurves)
422 {
423 *pcurves = eccurves_default;
424 *pcurveslen = sizeof(eccurves_default);
425 }
426 }
b362ccab
DSH		 427
428/* See if curve is allowed by security callback */
429static int tls_curve_allowed(SSL *s, const unsigned char *curve, int op)
430 {
f756fb43 431 const tls_curve_info *cinfo;
b362ccab
DSH		 432 if (curve[0])
433 return 1;
434 if ((curve[1] < 1) || ((size_t)curve[1] >
435 sizeof(nid_list)/sizeof(nid_list[0])))
436 return 0;
437 cinfo = &nid_list[curve[1]-1];
1a14b47e
DSH		 438#ifdef OPENSSL_NO_EC2M
439 if (cinfo->flags & TLS_CURVE_CHAR2)
440 return 0;
441#endif
b362ccab
DSH		 442 return ssl_security(s, op, cinfo->secbits, cinfo->nid, (void *)curve);
443 }
444
d18b716d
DSH		 445/* Check a curve is one of our preferences */
446int tls1_check_curve(SSL *s, const unsigned char *p, size_t len)
447 {
448 const unsigned char *curves;
449 size_t curveslen, i;
2ea80354 450 unsigned int suiteb_flags = tls1_suiteb(s);
d18b716d
DSH		 451 if (len != 3 || p[0] != NAMED_CURVE_TYPE)
452 return 0;
2ea80354
DSH		 453 /* Check curve matches Suite B preferences */
454 if (suiteb_flags)
455 {
456 unsigned long cid = s->s3->tmp.new_cipher->id;
457 if (p[1])
458 return 0;
459 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
460 {
461 if (p[2] != TLSEXT_curve_P_256)
462 return 0;
463 }
464 else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
465 {
466 if (p[2] != TLSEXT_curve_P_384)
467 return 0;
468 }
469 else /* Should never happen */
470 return 0;
471 }
d18b716d
DSH		 472 tls1_get_curvelist(s, 0, &curves, &curveslen);
473 for (i = 0; i < curveslen; i += 2, curves += 2)
474 {
475 if (p[1] == curves[0] && p[2] == curves[1])
b362ccab 476 return tls_curve_allowed(s, p + 1, SSL_SECOP_CURVE_CHECK);
d18b716d
DSH		 477 }
478 return 0;
479 }
d0595f17 480
a4352630 481/* Return nth shared curve. If nmatch == -1 return number of
2ea80354
DSH		 482 * matches. For nmatch == -2 return the NID of the curve to use for
483 * an EC tmp key.
d0595f17 484 */
a4352630
DSH		 485
486int tls1_shared_curve(SSL *s, int nmatch)
d0595f17
DSH		 487 {
488 const unsigned char *pref, *supp;
489 size_t preflen, supplen, i, j;
490 int k;
a4352630
DSH		 491 /* Can't do anything on client side */
492 if (s->server == 0)
493 return -1;
2ea80354
DSH		 494 if (nmatch == -2)
495 {
496 if (tls1_suiteb(s))
497 {
498 /* For Suite B ciphersuite determines curve: we
499 * already know these are acceptable due to previous
500 * checks.
501 */
502 unsigned long cid = s->s3->tmp.new_cipher->id;
503 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
504 return NID_X9_62_prime256v1; /* P-256 */
505 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
506 return NID_secp384r1; /* P-384 */
507 /* Should never happen */
508 return NID_undef;
509 }
510 /* If not Suite B just return first preference shared curve */
511 nmatch = 0;
512 }
a4352630
DSH		 513 tls1_get_curvelist(s, !!(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
514 &supp, &supplen);
515 tls1_get_curvelist(s, !(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE),
516 &pref, &preflen);
517 preflen /= 2;
518 supplen /= 2;
d0595f17
DSH		 519 k = 0;
520 for (i = 0; i < preflen; i++, pref+=2)
521 {
522 const unsigned char *tsupp = supp;
523 for (j = 0; j < supplen; j++, tsupp+=2)
524 {
525 if (pref[0] == tsupp[0] && pref[1] == tsupp[1])
526 {
b362ccab
DSH		 527 if (!tls_curve_allowed(s, pref, SSL_SECOP_CURVE_SHARED))
528 continue;
d0595f17 529 if (nmatch == k)
a4352630
DSH		 530 {
531 int id = (pref[0] << 8) | pref[1];
532 return tls1_ec_curve_id2nid(id);
533 }
d0595f17
DSH		 534 k++;
535 }
536 }
537 }
d0595f17 538 if (nmatch == -1)
a4352630
DSH		 539 return k;
540 return 0;
d0595f17
DSH		 541 }
542
543int tls1_set_curves(unsigned char **pext, size_t *pextlen,
544 int *curves, size_t ncurves)
545 {
546 unsigned char *clist, *p;
547 size_t i;
548 /* Bitmap of curves included to detect duplicates: only works
549 * while curve ids < 32
550 */
551 unsigned long dup_list = 0;
552 clist = OPENSSL_malloc(ncurves * 2);
553 if (!clist)
554 return 0;
555 for (i = 0, p = clist; i < ncurves; i++)
556 {
557 unsigned long idmask;
558 int id;
559 id = tls1_ec_nid2curve_id(curves[i]);
560 idmask = 1L << id;
561 if (!id || (dup_list & idmask))
562 {
563 OPENSSL_free(clist);
564 return 0;
565 }
566 dup_list |= idmask;
567 s2n(id, p);
568 }
569 if (*pext)
570 OPENSSL_free(*pext);
571 *pext = clist;
572 *pextlen = ncurves * 2;
573 return 1;
574 }
575
f6dfbeed 576#define MAX_CURVELIST 28
d0595f17
DSH		 577
578typedef struct
579 {
580 size_t nidcnt;
581 int nid_arr[MAX_CURVELIST];
582 } nid_cb_st;
583
584static int nid_cb(const char *elem, int len, void *arg)
585 {
586 nid_cb_st *narg = arg;
587 size_t i;
588 int nid;
589 char etmp[20];
590 if (narg->nidcnt == MAX_CURVELIST)
591 return 0;
592 if (len > (int)(sizeof(etmp) - 1))
593 return 0;
594 memcpy(etmp, elem, len);
595 etmp[len] = 0;
596 nid = EC_curve_nist2nid(etmp);
597 if (nid == NID_undef)
598 nid = OBJ_sn2nid(etmp);
599 if (nid == NID_undef)
600 nid = OBJ_ln2nid(etmp);
601 if (nid == NID_undef)
602 return 0;
603 for (i = 0; i < narg->nidcnt; i++)
604 if (narg->nid_arr[i] == nid)
605 return 0;
606 narg->nid_arr[narg->nidcnt++] = nid;
607 return 1;
608 }
609/* Set curves based on a colon separate list */
610int tls1_set_curves_list(unsigned char **pext, size_t *pextlen,
611 const char *str)
612 {
613 nid_cb_st ncb;
614 ncb.nidcnt = 0;
615 if (!CONF_parse_list(str, ':', 1, nid_cb, &ncb))
616 return 0;
8bb870df
DSH		 617 if (pext == NULL)
618 return 1;
d0595f17
DSH		 619 return tls1_set_curves(pext, pextlen, ncb.nid_arr, ncb.nidcnt);
620 }
fd2b65ce
DSH		 621/* For an EC key set TLS id and required compression based on parameters */
622static int tls1_set_ec_id(unsigned char *curve_id, unsigned char *comp_id,
623 EC_KEY *ec)
624 {
625 int is_prime, id;
626 const EC_GROUP *grp;
fd2b65ce
DSH		 627 const EC_METHOD *meth;
628 if (!ec)
629 return 0;
630 /* Determine if it is a prime field */
631 grp = EC_KEY_get0_group(ec);
29b490a4 632 if (!grp)
fd2b65ce
DSH		 633 return 0;
634 meth = EC_GROUP_method_of(grp);
635 if (!meth)
636 return 0;
637 if (EC_METHOD_get_field_type(meth) == NID_X9_62_prime_field)
638 is_prime = 1;
639 else
640 is_prime = 0;
641 /* Determine curve ID */
642 id = EC_GROUP_get_curve_name(grp);
643 id = tls1_ec_nid2curve_id(id);
644 /* If we have an ID set it, otherwise set arbitrary explicit curve */
645 if (id)
646 {
647 curve_id[0] = 0;
648 curve_id[1] = (unsigned char)id;
649 }
650 else
651 {
652 curve_id[0] = 0xff;
653 if (is_prime)
654 curve_id[1] = 0x01;
655 else
656 curve_id[1] = 0x02;
657 }
658 if (comp_id)
659 {
29b490a4
PS		 660 if (EC_KEY_get0_public_key(ec) == NULL)
661 return 0;
fd2b65ce
DSH		 662 if (EC_KEY_get_conv_form(ec) == POINT_CONVERSION_COMPRESSED)
663 {
664 if (is_prime)
665 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
666 else
667 *comp_id = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
668 }
669 else
670 *comp_id = TLSEXT_ECPOINTFORMAT_uncompressed;
671 }
672 return 1;
673 }
674/* Check an EC key is compatible with extensions */
675static int tls1_check_ec_key(SSL *s,
676 unsigned char *curve_id, unsigned char *comp_id)
677 {
678 const unsigned char *p;
679 size_t plen, i;
a4352630 680 int j;
fd2b65ce
DSH		 681 /* If point formats extension present check it, otherwise everything
682 * is supported (see RFC4492).
683 */
684 if (comp_id && s->session->tlsext_ecpointformatlist)
685 {
686 p = s->session->tlsext_ecpointformatlist;
687 plen = s->session->tlsext_ecpointformatlist_length;
688 for (i = 0; i < plen; i++, p++)
689 {
690 if (*comp_id == *p)
691 break;
692 }
693 if (i == plen)
694 return 0;
695 }
2ea80354
DSH		 696 if (!curve_id)
697 return 1;
a4352630
DSH		 698 /* Check curve is consistent with client and server preferences */
699 for (j = 0; j <= 1; j++)
fd2b65ce 700 {
a4352630 701 tls1_get_curvelist(s, j, &p, &plen);
fd2b65ce
DSH		 702 for (i = 0; i < plen; i+=2, p+=2)
703 {
704 if (p[0] == curve_id[0] && p[1] == curve_id[1])
a4352630 705 break;
fd2b65ce 706 }
a4352630
DSH		 707 if (i == plen)
708 return 0;
2ea80354
DSH		 709 /* For clients can only check sent curve list */
710 if (!s->server)
b362ccab 711 break;
fd2b65ce
DSH		 712 }
713 return 1;
714 }
d61ff83b 715
5087afa1
DSH		 716static void tls1_get_formatlist(SSL *s, const unsigned char **pformats,
717 size_t *pformatslen)
718 {
719 /* If we have a custom point format list use it otherwise
720 * use default */
721 if (s->tlsext_ecpointformatlist)
722 {
723 *pformats = s->tlsext_ecpointformatlist;
724 *pformatslen = s->tlsext_ecpointformatlist_length;
725 }
726 else
727 {
728 *pformats = ecformats_default;
729 /* For Suite B we don't support char2 fields */
730 if (tls1_suiteb(s))
731 *pformatslen = sizeof(ecformats_default) - 1;
732 else
733 *pformatslen = sizeof(ecformats_default);
734 }
735 }
736
d61ff83b
DSH		 737/* Check cert parameters compatible with extensions: currently just checks
738 * EC certificates have compatible curves and compression.
739 */
2ea80354 740static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
fd2b65ce 741 {
fd2b65ce 742 unsigned char comp_id, curve_id[2];
d61ff83b
DSH		 743 EVP_PKEY *pkey;
744 int rv;
745 pkey = X509_get_pubkey(x);
fd2b65ce
DSH		 746 if (!pkey)
747 return 0;
d61ff83b
DSH		 748 /* If not EC nothing to do */
749 if (pkey->type != EVP_PKEY_EC)
750 {
751 EVP_PKEY_free(pkey);
752 return 1;
753 }
fd2b65ce
DSH		 754 rv = tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec);
755 EVP_PKEY_free(pkey);
756 if (!rv)
757 return 0;
2ea80354
DSH		 758 /* Can't check curve_id for client certs as we don't have a
759 * supported curves extension.
760 */
761 rv = tls1_check_ec_key(s, s->server ? curve_id : NULL, &comp_id);
762 if (!rv)
763 return 0;
764 /* Special case for suite B. We *MUST* sign using SHA256+P-256 or
765 * SHA384+P-384, adjust digest if necessary.
766 */
767 if (set_ee_md && tls1_suiteb(s))
768 {
769 int check_md;
770 size_t i;
771 CERT *c = s->cert;
772 if (curve_id[0])
773 return 0;
774 /* Check to see we have necessary signing algorithm */
775 if (curve_id[1] == TLSEXT_curve_P_256)
776 check_md = NID_ecdsa_with_SHA256;
777 else if (curve_id[1] == TLSEXT_curve_P_384)
778 check_md = NID_ecdsa_with_SHA384;
779 else
780 return 0; /* Should never happen */
781 for (i = 0; i < c->shared_sigalgslen; i++)
782 if (check_md == c->shared_sigalgs[i].signandhash_nid)
783 break;
784 if (i == c->shared_sigalgslen)
785 return 0;
786 if (set_ee_md == 2)
787 {
788 if (check_md == NID_ecdsa_with_SHA256)
789 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha256();
790 else
791 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha384();
792 }
793 }
794 return rv;
fd2b65ce
DSH		 795 }
796/* Check EC temporary key is compatible with client extensions */
2ea80354 797int tls1_check_ec_tmp_key(SSL *s, unsigned long cid)
fd2b65ce
DSH		 798 {
799 unsigned char curve_id[2];
800 EC_KEY *ec = s->cert->ecdh_tmp;
ed83ba53
DSH		 801#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
802 /* Allow any curve: not just those peer supports */
ddd13d67 803 if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
ed83ba53
DSH		 804 return 1;
805#endif
2ea80354
DSH		 806 /* If Suite B, AES128 MUST use P-256 and AES256 MUST use P-384,
807 * no other curves permitted.
808 */
809 if (tls1_suiteb(s))
810 {
811 /* Curve to check determined by ciphersuite */
812 if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256)
813 curve_id[1] = TLSEXT_curve_P_256;
814 else if (cid == TLS1_CK_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384)
815 curve_id[1] = TLSEXT_curve_P_384;
816 else
817 return 0;
818 curve_id[0] = 0;
819 /* Check this curve is acceptable */
820 if (!tls1_check_ec_key(s, curve_id, NULL))
821 return 0;
822 /* If auto or setting curve from callback assume OK */
823 if (s->cert->ecdh_tmp_auto || s->cert->ecdh_tmp_cb)
824 return 1;
825 /* Otherwise check curve is acceptable */
826 else
827 {
828 unsigned char curve_tmp[2];
829 if (!ec)
830 return 0;
831 if (!tls1_set_ec_id(curve_tmp, NULL, ec))
832 return 0;
833 if (!curve_tmp[0] || curve_tmp[1] == curve_id[1])
834 return 1;
835 return 0;
836 }
837
838 }
a4352630
DSH		 839 if (s->cert->ecdh_tmp_auto)
840 {
841 /* Need a shared curve */
842 if (tls1_shared_curve(s, 0))
843 return 1;
844 else return 0;
845 }
fd2b65ce
DSH		 846 if (!ec)
847 {
848 if (s->cert->ecdh_tmp_cb)
849 return 1;
850 else
851 return 0;
852 }
853 if (!tls1_set_ec_id(curve_id, NULL, ec))
1e4cb467 854 return 0;
d18b716d
DSH		 855/* Set this to allow use of invalid curves for testing */
856#if 0
857 return 1;
858#else
fd2b65ce 859 return tls1_check_ec_key(s, curve_id, NULL);
d18b716d 860#endif
fd2b65ce 861 }
d0595f17 862
14536c8c
DSH		 863#else
864
865static int tls1_check_cert_param(SSL *s, X509 *x, int set_ee_md)
866 {
867 return 1;
868 }
869
525de5d3 870#endif /* OPENSSL_NO_EC */
f1fd4544 871
ed3883d2 872#ifndef OPENSSL_NO_TLSEXT
fc101f88
DSH		 873
874/* List of supported signature algorithms and hashes. Should make this
875 * customisable at some point, for now include everything we support.
876 */
877
878#ifdef OPENSSL_NO_RSA
879#define tlsext_sigalg_rsa(md) /* */
880#else
881#define tlsext_sigalg_rsa(md) md, TLSEXT_signature_rsa,
882#endif
883
884#ifdef OPENSSL_NO_DSA
885#define tlsext_sigalg_dsa(md) /* */
886#else
887#define tlsext_sigalg_dsa(md) md, TLSEXT_signature_dsa,
888#endif
889
890#ifdef OPENSSL_NO_ECDSA
891#define tlsext_sigalg_ecdsa(md) /* */
892#else
654ac273 893#define tlsext_sigalg_ecdsa(md) md, TLSEXT_signature_ecdsa,
fc101f88
DSH		 894#endif
895
896#define tlsext_sigalg(md) \
897 tlsext_sigalg_rsa(md) \
898 tlsext_sigalg_dsa(md) \
899 tlsext_sigalg_ecdsa(md)
900
901static unsigned char tls12_sigalgs[] = {
902#ifndef OPENSSL_NO_SHA512
903 tlsext_sigalg(TLSEXT_hash_sha512)
904 tlsext_sigalg(TLSEXT_hash_sha384)
905#endif
906#ifndef OPENSSL_NO_SHA256
907 tlsext_sigalg(TLSEXT_hash_sha256)
908 tlsext_sigalg(TLSEXT_hash_sha224)
909#endif
910#ifndef OPENSSL_NO_SHA
911 tlsext_sigalg(TLSEXT_hash_sha1)
912#endif
fc101f88 913};
14536c8c 914#ifndef OPENSSL_NO_ECDSA
2ea80354
DSH		 915static unsigned char suiteb_sigalgs[] = {
916 tlsext_sigalg_ecdsa(TLSEXT_hash_sha256)
917 tlsext_sigalg_ecdsa(TLSEXT_hash_sha384)
918};
14536c8c 919#endif
b7bfe69b 920size_t tls12_get_psigalgs(SSL *s, const unsigned char **psigs)
f37f20ff 921 {
2ea80354
DSH		 922 /* If Suite B mode use Suite B sigalgs only, ignore any other
923 * preferences.
924 */
14536c8c 925#ifndef OPENSSL_NO_EC
2ea80354
DSH		 926 switch (tls1_suiteb(s))
927 {
928 case SSL_CERT_FLAG_SUITEB_128_LOS:
929 *psigs = suiteb_sigalgs;
930 return sizeof(suiteb_sigalgs);
931
932 case SSL_CERT_FLAG_SUITEB_128_LOS_ONLY:
933 *psigs = suiteb_sigalgs;
934 return 2;
935
936 case SSL_CERT_FLAG_SUITEB_192_LOS:
937 *psigs = suiteb_sigalgs + 2;
938 return 2;
939 }
14536c8c 940#endif
3dbc46df
DSH		 941 /* If server use client authentication sigalgs if not NULL */
942 if (s->server && s->cert->client_sigalgs)
943 {
b7bfe69b
DSH		 944 *psigs = s->cert->client_sigalgs;
945 return s->cert->client_sigalgslen;
3dbc46df
DSH		 946 }
947 else if (s->cert->conf_sigalgs)
948 {
b7bfe69b
DSH		 949 *psigs = s->cert->conf_sigalgs;
950 return s->cert->conf_sigalgslen;
3dbc46df 951 }
4453cd8c 952 else
0f229cce 953 {
b7bfe69b 954 *psigs = tls12_sigalgs;
45473632 955 return sizeof(tls12_sigalgs);
4453cd8c 956 }
b7bfe69b 957 }
ec4a50b3
DSH		 958/* Check signature algorithm is consistent with sent supported signature
959 * algorithms and if so return relevant digest.
960 */
961int tls12_check_peer_sigalg(const EVP_MD **pmd, SSL *s,
962 const unsigned char *sig, EVP_PKEY *pkey)
963 {
964 const unsigned char *sent_sigs;
965 size_t sent_sigslen, i;
966 int sigalg = tls12_get_sigid(pkey);
967 /* Should never happen */
968 if (sigalg == -1)
969 return -1;
970 /* Check key type is consistent with signature */
971 if (sigalg != (int)sig[1])
972 {
973 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
974 return 0;
975 }
14536c8c 976#ifndef OPENSSL_NO_EC
2ea80354
DSH		 977 if (pkey->type == EVP_PKEY_EC)
978 {
979 unsigned char curve_id[2], comp_id;
980 /* Check compression and curve matches extensions */
981 if (!tls1_set_ec_id(curve_id, &comp_id, pkey->pkey.ec))
982 return 0;
983 if (!s->server && !tls1_check_ec_key(s, curve_id, &comp_id))
ed83ba53
DSH		 984 {
985 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_CURVE);
2ea80354 986 return 0;
ed83ba53 987 }
2ea80354
DSH		 988 /* If Suite B only P-384+SHA384 or P-256+SHA-256 allowed */
989 if (tls1_suiteb(s))
990 {
991 if (curve_id[0])
992 return 0;
993 if (curve_id[1] == TLSEXT_curve_P_256)
994 {
995 if (sig[0] != TLSEXT_hash_sha256)
996 {
997 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
998 SSL_R_ILLEGAL_SUITEB_DIGEST);
999 return 0;
1000 }
1001 }
1002 else if (curve_id[1] == TLSEXT_curve_P_384)
1003 {
1004 if (sig[0] != TLSEXT_hash_sha384)
1005 {
1006 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,
1007 SSL_R_ILLEGAL_SUITEB_DIGEST);
1008 return 0;
1009 }
1010 }
1011 else
1012 return 0;
1013 }
1014 }
1015 else if (tls1_suiteb(s))
1016 return 0;
14536c8c 1017#endif
2ea80354 1018
ec4a50b3
DSH		 1019 /* Check signature matches a type we sent */
1020 sent_sigslen = tls12_get_psigalgs(s, &sent_sigs);
1021 for (i = 0; i < sent_sigslen; i+=2, sent_sigs+=2)
1022 {
1023 if (sig[0] == sent_sigs[0] && sig[1] == sent_sigs[1])
1024 break;
1025 }
1026 /* Allow fallback to SHA1 if not strict mode */
2ea80354 1027 if (i == sent_sigslen && (sig[0] != TLSEXT_hash_sha1 || s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
ec4a50b3
DSH		 1028 {
1029 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
1030 return 0;
1031 }
1032 *pmd = tls12_get_hash(sig[0]);
1033 if (*pmd == NULL)
1034 {
1035 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_UNKNOWN_DIGEST);
1036 return 0;
1037 }
b362ccab
DSH		 1038 /* Make sure security callback allows algorithm */
1039 if (!ssl_security(s, SSL_SECOP_SIGALG_CHECK,
1040 EVP_MD_size(*pmd) * 4, EVP_MD_type(*pmd),
1041 (void *)sig))
1042 {
1043 SSLerr(SSL_F_TLS12_CHECK_PEER_SIGALG,SSL_R_WRONG_SIGNATURE_TYPE);
1044 return 0;
1045 }
319354eb
DSH		 1046 /* Store the digest used so applications can retrieve it if they
1047 * wish.
1048 */
1049 if (s->session && s->session->sess_cert)
1050 s->session->sess_cert->peer_key->digest = *pmd;
ec4a50b3
DSH		 1051 return 1;
1052 }
b362ccab 1053
b7bfe69b
DSH		 1054/* Get a mask of disabled algorithms: an algorithm is disabled
1055 * if it isn't supported or doesn't appear in supported signature
1056 * algorithms. Unlike ssl_cipher_get_disabled this applies to a specific
1057 * session and not global settings.
1058 *
1059 */
1060void ssl_set_client_disabled(SSL *s)
1061 {
1062 CERT *c = s->cert;
b7bfe69b
DSH		 1063 c->mask_a = 0;
1064 c->mask_k = 0;
4221c0dd 1065 /* Don't allow TLS 1.2 only ciphers if we don't suppport them */
1e2d4cb0 1066 if (!SSL_CLIENT_USE_TLS1_2_CIPHERS(s))
b7bfe69b
DSH		 1067 c->mask_ssl = SSL_TLSV1_2;
1068 else
1069 c->mask_ssl = 0;
b362ccab
DSH		 1070 ssl_set_sig_mask(&c->mask_a, s, SSL_SECOP_SIGALG_MASK);
1071 /* Disable static DH if we don't include any appropriate
b7bfe69b
DSH		 1072 * signature algorithms.
1073 */
b362ccab 1074 if (c->mask_a & SSL_aRSA)
b7bfe69b 1075 c->mask_k |= SSL_kDHr|SSL_kECDHr;
b362ccab 1076 if (c->mask_a & SSL_aDSS)
b7bfe69b 1077 c->mask_k |= SSL_kDHd;
b362ccab 1078 if (c->mask_a & SSL_aECDSA)
b7bfe69b 1079 c->mask_k |= SSL_kECDHe;
b7bfe69b
DSH		 1080#ifndef OPENSSL_NO_KRB5
1081 if (!kssl_tgt_is_available(s->kssl_ctx))
1082 {
1083 c->mask_a |= SSL_aKRB5;
1084 c->mask_k |= SSL_kKRB5;
1085 }
1086#endif
1087#ifndef OPENSSL_NO_PSK
1088 /* with PSK there must be client callback set */
1089 if (!s->psk_client_callback)
1090 {
1091 c->mask_a |= SSL_aPSK;
1092 c->mask_k |= SSL_kPSK;
1093 }
1094#endif /* OPENSSL_NO_PSK */
80bd7b41
DSH		 1095#ifndef OPENSSL_NO_SRP
1096 if (!(s->srp_ctx.srp_Mask & SSL_kSRP))
1097 {
1098 c->mask_a |= SSL_aSRP;
1099 c->mask_k |= SSL_kSRP;
1100 }
1101#endif
b7bfe69b 1102 c->valid = 1;
f37f20ff 1103 }
fc101f88 1104
b362ccab 1105int ssl_cipher_disabled(SSL *s, const SSL_CIPHER *c, int op)
8b8e5bed
DSH		 1106 {
1107 CERT *ct = s->cert;
1108 if (c->algorithm_ssl & ct->mask_ssl || c->algorithm_mkey & ct->mask_k || c->algorithm_auth & ct->mask_a)
1109 return 1;
b362ccab
DSH		 1110 return !ssl_security(s, op, c->strength_bits, 0, (void *)c);
1111 }
1112
1113static int tls_use_ticket(SSL *s)
1114 {
1115 if (s->options & SSL_OP_NO_TICKET)
1116 return 0;
1117 return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
8b8e5bed
DSH		 1118 }
1119
22a10c89 1120unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *buf, unsigned char *limit, int *al)
f1fd4544 1121 {
ed3883d2 1122 int extdatalen=0;
22a10c89
BL		 1123 unsigned char *orig = buf;
1124 unsigned char *ret = buf;
d0595f17
DSH		 1125#ifndef OPENSSL_NO_EC
1126 /* See if we support any ECC ciphersuites */
1127 int using_ecc = 0;
874a18cf 1128 if (s->version >= TLS1_VERSION || SSL_IS_DTLS(s))
d0595f17
DSH		 1129 {
1130 int i;
1131 unsigned long alg_k, alg_a;
1132 STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1133
1134 for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
1135 {
1136 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1137
1138 alg_k = c->algorithm_mkey;
1139 alg_a = c->algorithm_auth;
4082fea8 1140 if ((alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe)
d0595f17
DSH		 1141 || (alg_a & SSL_aECDSA)))
1142 {
1143 using_ecc = 1;
1144 break;
1145 }
1146 }
1147 }
1148#endif
ed3883d2
BM		 1149
1150 ret+=2;
1151
1152 if (ret>=limit) return NULL; /* this really never occurs, but ... */
6434abbf 1153
5a3d8eeb
DSH		 1154 /* Add RI if renegotiating */
1155 if (s->renegotiate)
1156 {
1157 int el;
1158
1159 if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
1160 {
1161 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1162 return NULL;
1163 }
1164
1165 if((limit - ret - 4 - el) < 0) return NULL;
1166
1167 s2n(TLSEXT_TYPE_renegotiate,ret);
1168 s2n(el,ret);
1169
1170 if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
1171 {
1172 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1173 return NULL;
1174 }
1175
1176 ret += el;
1177 }
1178 /* Only add RI for SSLv3 */
1179 if (s->client_version == SSL3_VERSION)
1180 goto done;
1181
a70183bc 1182 if (s->tlsext_hostname != NULL)
f1fd4544 1183 {
ed3883d2
BM		 1184 /* Add TLS extension servername to the Client Hello message */
1185 unsigned long size_str;
1186 long lenmax;
1187
a70183bc 1188 /* check for enough space.
52b8dad8
BM		 1189 4 for the servername type and entension length
1190 2 for servernamelist length
1191 1 for the hostname type
1192 2 for hostname length
1193 + hostname length
a70183bc 1194 */
52b8dad8 1195
761772d7
BM		 1196 if ((lenmax = limit - ret - 9) < 0
1197 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
a70183bc
BM		 1198 return NULL;
1199
1200 /* extension type and length */
1201 s2n(TLSEXT_TYPE_server_name,ret);
1202 s2n(size_str+5,ret);
f1fd4544 1203
a70183bc 1204 /* length of servername list */
ed3883d2 1205 s2n(size_str+3,ret);
a70183bc
BM		 1206
1207 /* hostname type, length and hostname */
f1fd4544 1208 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
ed3883d2 1209 s2n(size_str,ret);
ed3883d2
BM		 1210 memcpy(ret, s->tlsext_hostname, size_str);
1211 ret+=size_str;
f1fd4544 1212 }
761772d7 1213
edc032b5 1214#ifndef OPENSSL_NO_SRP
1df80b65 1215 /* Add SRP username if there is one */
edc032b5 1216 if (s->srp_ctx.login != NULL)
1df80b65 1217 { /* Add TLS extension SRP username to the Client Hello message */
edc032b5 1218
1df80b65
DSH		 1219 int login_len = strlen(s->srp_ctx.login);
1220 if (login_len > 255 || login_len == 0)
edc032b5
BL		 1221 {
1222 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1223 return NULL;
1df80b65
DSH		 1224 }
1225
1226 /* check for enough space.
1227 4 for the srp type type and entension length
1228 1 for the srp user identity
1229 + srp user identity length
1230 */
1231 if ((limit - ret - 5 - login_len) < 0) return NULL;
1232
1233 /* fill in the extension */
edc032b5
BL		 1234 s2n(TLSEXT_TYPE_srp,ret);
1235 s2n(login_len+1,ret);
1df80b65
DSH		 1236 (*ret++) = (unsigned char) login_len;
1237 memcpy(ret, s->srp_ctx.login, login_len);
edc032b5
BL		 1238 ret+=login_len;
1239 }
1240#endif
1241
36ca4ba6 1242#ifndef OPENSSL_NO_EC
d0595f17 1243 if (using_ecc)
36ca4ba6
BM		 1244 {
1245 /* Add TLS extension ECPointFormats to the ClientHello message */
1246 long lenmax;
d0595f17
DSH		 1247 const unsigned char *plist;
1248 size_t plistlen;
b362ccab
DSH		 1249 size_t i;
1250 unsigned char *etmp;
5087afa1
DSH		 1251
1252 tls1_get_formatlist(s, &plist, &plistlen);
36ca4ba6 1253
761772d7 1254 if ((lenmax = limit - ret - 5) < 0) return NULL;
d0595f17
DSH		 1255 if (plistlen > (size_t)lenmax) return NULL;
1256 if (plistlen > 255)
019fdc78
BM		 1257 {
1258 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1259 return NULL;
1260 }
36ca4ba6
BM		 1261
1262 s2n(TLSEXT_TYPE_ec_point_formats,ret);
d0595f17
DSH		 1263 s2n(plistlen + 1,ret);
1264 *(ret++) = (unsigned char)plistlen ;
1265 memcpy(ret, plist, plistlen);
1266 ret+=plistlen;
1267
33273721 1268 /* Add TLS extension EllipticCurves to the ClientHello message */
d0595f17 1269 plist = s->tlsext_ellipticcurvelist;
fd2b65ce 1270 tls1_get_curvelist(s, 0, &plist, &plistlen);
33273721 1271
761772d7 1272 if ((lenmax = limit - ret - 6) < 0) return NULL;
d0595f17
DSH		 1273 if (plistlen > (size_t)lenmax) return NULL;
1274 if (plistlen > 65532)
33273721
BM		 1275 {
1276 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1277 return NULL;
1278 }
b362ccab 1279
33273721
BM		 1280
1281 s2n(TLSEXT_TYPE_elliptic_curves,ret);
b362ccab
DSH		 1282 etmp = ret + 4;
1283 /* Copy curve ID if supported */
1284 for (i = 0; i < plistlen; i += 2, plist += 2)
1285 {
1286 if (tls_curve_allowed(s, plist, SSL_SECOP_CURVE_SUPPORTED))
1287 {
1288 *etmp++ = plist[0];
1289 *etmp++ = plist[1];
1290 }
1291 }
1292
1293 plistlen = etmp - ret - 4;
a4974de9 1294
b362ccab 1295 s2n(plistlen + 2, ret);
d0595f17 1296 s2n(plistlen, ret);
d0595f17 1297 ret+=plistlen;
33273721 1298 }
36ca4ba6 1299#endif /* OPENSSL_NO_EC */
d3442bc7 1300
b362ccab 1301 if (tls_use_ticket(s))
6434abbf
DSH		 1302 {
1303 int ticklen;
7ba3838a 1304 if (!s->new_session && s->session && s->session->tlsext_tick)
6434abbf 1305 ticklen = s->session->tlsext_ticklen;
12bf56c0
DSH		 1306 else if (s->session && s->tlsext_session_ticket &&
1307 s->tlsext_session_ticket->data)
1308 {
1309 ticklen = s->tlsext_session_ticket->length;
1310 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1311 if (!s->session->tlsext_tick)
1312 return NULL;
1313 memcpy(s->session->tlsext_tick,
1314 s->tlsext_session_ticket->data,
1315 ticklen);
1316 s->session->tlsext_ticklen = ticklen;
1317 }
6434abbf
DSH		 1318 else
1319 ticklen = 0;
12bf56c0
DSH		 1320 if (ticklen == 0 && s->tlsext_session_ticket &&
1321 s->tlsext_session_ticket->data == NULL)
1322 goto skip_ext;
6434abbf
DSH		 1323 /* Check for enough room 2 for extension type, 2 for len
1324 * rest for ticket
1325 */
761772d7 1326 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
6434abbf
DSH		 1327 s2n(TLSEXT_TYPE_session_ticket,ret);
1328 s2n(ticklen,ret);
1329 if (ticklen)
1330 {
1331 memcpy(ret, s->session->tlsext_tick, ticklen);
1332 ret += ticklen;
1333 }
1334 }
12bf56c0 1335 skip_ext:
6434abbf 1336
cbd64894 1337 if (SSL_USE_SIGALGS(s))
a2f9200f 1338 {
0f229cce 1339 size_t salglen;
b7bfe69b 1340 const unsigned char *salg;
b362ccab 1341 unsigned char *etmp;
b7bfe69b 1342 salglen = tls12_get_psigalgs(s, &salg);
0f229cce 1343 if ((size_t)(limit - ret) < salglen + 6)
a2f9200f
DSH		 1344 return NULL;
1345 s2n(TLSEXT_TYPE_signature_algorithms,ret);
b362ccab
DSH		 1346 etmp = ret;
1347 /* Skip over lengths for now */
1348 ret += 4;
deffd89a 1349 salglen = tls12_copy_sigalgs(s, ret, salg, salglen);
b362ccab
DSH		 1350 /* Fill in lengths */
1351 s2n(salglen + 2, etmp);
1352 s2n(salglen, etmp);
0f229cce 1353 ret += salglen;
a2f9200f
DSH		 1354 }
1355
761772d7 1356#ifdef TLSEXT_TYPE_opaque_prf_input
874a18cf 1357 if (s->s3->client_opaque_prf_input != NULL)
761772d7
BM		 1358 {
1359 size_t col = s->s3->client_opaque_prf_input_len;
1360
487dac87 1361 if ((long)(limit - ret - 6 - col) < 0)
761772d7
BM		 1362 return NULL;
1363 if (col > 0xFFFD) /* can't happen */
1364 return NULL;
1365
1366 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1367 s2n(col + 2, ret);
1368 s2n(col, ret);
1369 memcpy(ret, s->s3->client_opaque_prf_input, col);
1370 ret += col;
1371 }
1372#endif
1373
874a18cf 1374 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
67c8e7f4
DSH		 1375 {
1376 int i;
1377 long extlen, idlen, itmp;
1378 OCSP_RESPID *id;
1379
1380 idlen = 0;
1381 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1382 {
1383 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1384 itmp = i2d_OCSP_RESPID(id, NULL);
1385 if (itmp <= 0)
1386 return NULL;
1387 idlen += itmp + 2;
1388 }
1389
1390 if (s->tlsext_ocsp_exts)
1391 {
1392 extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
1393 if (extlen < 0)
1394 return NULL;
1395 }
1396 else
1397 extlen = 0;
1398
1399 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
1400 s2n(TLSEXT_TYPE_status_request, ret);
1401 if (extlen + idlen > 0xFFF0)
1402 return NULL;
1403 s2n(extlen + idlen + 5, ret);
1404 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
1405 s2n(idlen, ret);
1406 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
1407 {
1408 /* save position of id len */
1409 unsigned char *q = ret;
1410 id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
1411 /* skip over id len */
1412 ret += 2;
1413 itmp = i2d_OCSP_RESPID(id, &ret);
1414 /* write id len */
1415 s2n(itmp, q);
1416 }
1417 s2n(extlen, ret);
1418 if (extlen > 0)
1419 i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
1420 }
1421
4817504d
DSH		 1422#ifndef OPENSSL_NO_HEARTBEATS
1423 /* Add Heartbeat extension */
c7f26739
DB		 1424 if ((limit - ret - 4 - 1) < 0)
1425 return NULL;
4817504d
DSH		 1426 s2n(TLSEXT_TYPE_heartbeat,ret);
1427 s2n(1,ret);
1428 /* Set mode:
1429 * 1: peer may send requests
1430 * 2: peer not allowed to send requests
1431 */
1432 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1433 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1434 else
1435 *(ret++) = SSL_TLSEXT_HB_ENABLED;
1436#endif
1437
bf48836c 1438#ifndef OPENSSL_NO_NEXTPROTONEG
ee2ffc27
BL		 1439 if (s->ctx->next_proto_select_cb && !s->s3->tmp.finish_md_len)
1440 {
1441 /* The client advertises an emtpy extension to indicate its
1442 * support for Next Protocol Negotiation */
1443 if (limit - ret - 4 < 0)
1444 return NULL;
1445 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1446 s2n(0,ret);
1447 }
1448#endif
1449
6f017a8f
AL		 1450 if (s->alpn_client_proto_list && !s->s3->tmp.finish_md_len)
1451 {
1452 if ((size_t)(limit - ret) < 6 + s->alpn_client_proto_list_len)
1453 return NULL;
1454 s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
1455 s2n(2 + s->alpn_client_proto_list_len,ret);
1456 s2n(s->alpn_client_proto_list_len,ret);
1457 memcpy(ret, s->alpn_client_proto_list,
1458 s->alpn_client_proto_list_len);
1459 ret += s->alpn_client_proto_list_len;
1460 }
1461
e659eff2 1462 if(SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s))
333f926d
BL		 1463 {
1464 int el;
1465
1466 ssl_add_clienthello_use_srtp_ext(s, 0, &el, 0);
1467
22a10c89 1468 if((limit - ret - 4 - el) < 0) return NULL;
333f926d
BL		 1469
1470 s2n(TLSEXT_TYPE_use_srtp,ret);
1471 s2n(el,ret);
1472
1473 if(ssl_add_clienthello_use_srtp_ext(s, ret, &el, el))
1474 {
1475 SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1476 return NULL;
1477 }
1478 ret += el;
1479 }
28ea0a0c 1480 custom_ext_init(&s->cert->cli_ext);
a398f821 1481 /* Add custom TLS Extensions to ClientHello */
ecf4d660
DSH		 1482 if (!custom_ext_add(s, 0, &ret, limit, al))
1483 return NULL;
5e3ff62c 1484#ifdef TLSEXT_TYPE_encrypt_then_mac
5a3d8eeb
DSH		 1485 s2n(TLSEXT_TYPE_encrypt_then_mac,ret);
1486 s2n(0,ret);
5e3ff62c 1487#endif
01f2f18f 1488
4fcdd66f 1489 /* Add padding to workaround bugs in F5 terminators.
cd6bd5ff 1490 * See https://tools.ietf.org/html/draft-agl-tls-padding-03
4fcdd66f
DSH		 1491 *
1492 * NB: because this code works out the length of all existing
1493 * extensions it MUST always appear last.
0467ea68 1494 */
01f2f18f 1495 if (s->options & SSL_OP_TLSEXT_PADDING)
0467ea68 1496 {
01f2f18f
DSH		 1497 int hlen = ret - (unsigned char *)s->init_buf->data;
1498 /* The code in s23_clnt.c to build ClientHello messages
1499 * includes the 5-byte record header in the buffer, while
1500 * the code in s3_clnt.c does not.
1501 */
1502 if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
1503 hlen -= 5;
1504 if (hlen > 0xff && hlen < 0x200)
1505 {
1506 hlen = 0x200 - hlen;
1507 if (hlen >= 4)
1508 hlen -= 4;
1509 else
1510 hlen = 0;
4fcdd66f 1511
01f2f18f
DSH		 1512 s2n(TLSEXT_TYPE_padding, ret);
1513 s2n(hlen, ret);
1514 memset(ret, 0, hlen);
1515 ret += hlen;
1516 }
0467ea68 1517 }
a398f821 1518
5a3d8eeb
DSH		 1519 done:
1520
22a10c89
BL		 1521 if ((extdatalen = ret-orig-2)== 0)
1522 return orig;
ed3883d2 1523
22a10c89 1524 s2n(extdatalen, orig);
ed3883d2 1525 return ret;
52b8dad8 1526 }
ed3883d2 1527
22a10c89 1528unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *buf, unsigned char *limit, int *al)
f1fd4544 1529 {
ed3883d2 1530 int extdatalen=0;
22a10c89
BL		 1531 unsigned char *orig = buf;
1532 unsigned char *ret = buf;
bf48836c
BL		 1533#ifndef OPENSSL_NO_NEXTPROTONEG
1534 int next_proto_neg_seen;
ee2ffc27 1535#endif
14536c8c 1536#ifndef OPENSSL_NO_EC
5087afa1
DSH		 1537 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1538 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
4082fea8 1539 int using_ecc = (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
5087afa1 1540 using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
14536c8c 1541#endif
5f8f94a6 1542
a13c20f6 1543 ret+=2;
ed3883d2
BM		 1544 if (ret>=limit) return NULL; /* this really never occurs, but ... */
1545
8025e251 1546 if(s->s3->send_connection_binding)
860c3dd1
DSH		 1547 {
1548 int el;
1549
1550 if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
1551 {
1552 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1553 return NULL;
1554 }
1555
22a10c89 1556 if((limit - ret - 4 - el) < 0) return NULL;
860c3dd1
DSH		 1557
1558 s2n(TLSEXT_TYPE_renegotiate,ret);
1559 s2n(el,ret);
1560
1561 if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
1562 {
1563 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1564 return NULL;
1565 }
1566
1567 ret += el;
1568 }
1569
5a3d8eeb
DSH		 1570 /* Only add RI for SSLv3 */
1571 if (s->version == SSL3_VERSION)
1572 goto done;
1573
1574 if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
1575 {
1576 if ((long)(limit - ret - 4) < 0) return NULL;
1577
1578 s2n(TLSEXT_TYPE_server_name,ret);
1579 s2n(0,ret);
1580 }
1581
36ca4ba6 1582#ifndef OPENSSL_NO_EC
874a18cf 1583 if (using_ecc)
36ca4ba6 1584 {
5087afa1
DSH		 1585 const unsigned char *plist;
1586 size_t plistlen;
36ca4ba6
BM		 1587 /* Add TLS extension ECPointFormats to the ServerHello message */
1588 long lenmax;
1589
5087afa1
DSH		 1590 tls1_get_formatlist(s, &plist, &plistlen);
1591
761772d7 1592 if ((lenmax = limit - ret - 5) < 0) return NULL;
5087afa1
DSH		 1593 if (plistlen > (size_t)lenmax) return NULL;
1594 if (plistlen > 255)
019fdc78
BM		 1595 {
1596 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
1597 return NULL;
1598 }
36ca4ba6
BM		 1599
1600 s2n(TLSEXT_TYPE_ec_point_formats,ret);
5087afa1
DSH		 1601 s2n(plistlen + 1,ret);
1602 *(ret++) = (unsigned char) plistlen;
1603 memcpy(ret, plist, plistlen);
1604 ret+=plistlen;
a70183bc 1605
36ca4ba6 1606 }
33273721 1607 /* Currently the server should not respond with a SupportedCurves extension */
36ca4ba6 1608#endif /* OPENSSL_NO_EC */
67c8e7f4 1609
b362ccab 1610 if (s->tlsext_ticket_expected && tls_use_ticket(s))
6434abbf 1611 {
761772d7 1612 if ((long)(limit - ret - 4) < 0) return NULL;
6434abbf
DSH		 1613 s2n(TLSEXT_TYPE_session_ticket,ret);
1614 s2n(0,ret);
1615 }
761772d7 1616
67c8e7f4
DSH		 1617 if (s->tlsext_status_expected)
1618 {
1619 if ((long)(limit - ret - 4) < 0) return NULL;
1620 s2n(TLSEXT_TYPE_status_request,ret);
1621 s2n(0,ret);
1622 }
1623
761772d7 1624#ifdef TLSEXT_TYPE_opaque_prf_input
874a18cf 1625 if (s->s3->server_opaque_prf_input != NULL)
761772d7
BM		 1626 {
1627 size_t sol = s->s3->server_opaque_prf_input_len;
6434abbf 1628
761772d7
BM		 1629 if ((long)(limit - ret - 6 - sol) < 0)
1630 return NULL;
1631 if (sol > 0xFFFD) /* can't happen */
1632 return NULL;
1633
1634 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
1635 s2n(sol + 2, ret);
1636 s2n(sol, ret);
1637 memcpy(ret, s->s3->server_opaque_prf_input, sol);
1638 ret += sol;
1639 }
1640#endif
333f926d 1641
e659eff2 1642 if(SSL_IS_DTLS(s) && s->srtp_profile)
333f926d
BL		 1643 {
1644 int el;
1645
1646 ssl_add_serverhello_use_srtp_ext(s, 0, &el, 0);
1647
22a10c89 1648 if((limit - ret - 4 - el) < 0) return NULL;
333f926d
BL		 1649
1650 s2n(TLSEXT_TYPE_use_srtp,ret);
1651 s2n(el,ret);
1652
1653 if(ssl_add_serverhello_use_srtp_ext(s, ret, &el, el))
1654 {
7a236261 1655 SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
333f926d
BL		 1656 return NULL;
1657 }
1658 ret+=el;
1659 }
1660
0e1dba93
DSH		 1661 if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
1662 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
1663 { const unsigned char cryptopro_ext[36] = {
1664 0xfd, 0xe8, /*65000*/
1665 0x00, 0x20, /*32 bytes length*/
1666 0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
1667 0x03, 0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
1668 0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
1669 0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
1670 if (limit-ret<36) return NULL;
1671 memcpy(ret,cryptopro_ext,36);
1672 ret+=36;
1673
1674 }
761772d7 1675
4817504d 1676#ifndef OPENSSL_NO_HEARTBEATS
5733919d
DSH		 1677 /* Add Heartbeat extension if we've received one */
1678 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED)
1679 {
c7f26739
DB		 1680 if ((limit - ret - 4 - 1) < 0)
1681 return NULL;
5733919d
DSH		 1682 s2n(TLSEXT_TYPE_heartbeat,ret);
1683 s2n(1,ret);
1684 /* Set mode:
1685 * 1: peer may send requests
1686 * 2: peer not allowed to send requests
1687 */
1688 if (s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_RECV_REQUESTS)
1689 *(ret++) = SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
1690 else
1691 *(ret++) = SSL_TLSEXT_HB_ENABLED;
192540b5 1692
5733919d 1693 }
4817504d
DSH		 1694#endif
1695
bf48836c 1696#ifndef OPENSSL_NO_NEXTPROTONEG
ee2ffc27
BL		 1697 next_proto_neg_seen = s->s3->next_proto_neg_seen;
1698 s->s3->next_proto_neg_seen = 0;
1699 if (next_proto_neg_seen && s->ctx->next_protos_advertised_cb)
1700 {
1701 const unsigned char *npa;
1702 unsigned int npalen;
1703 int r;
1704
1705 r = s->ctx->next_protos_advertised_cb(s, &npa, &npalen, s->ctx->next_protos_advertised_cb_arg);
1706 if (r == SSL_TLSEXT_ERR_OK)
1707 {
1708 if ((long)(limit - ret - 4 - npalen) < 0) return NULL;
1709 s2n(TLSEXT_TYPE_next_proto_neg,ret);
1710 s2n(npalen,ret);
1711 memcpy(ret, npa, npalen);
1712 ret += npalen;
1713 s->s3->next_proto_neg_seen = 1;
1714 }
1715 }
1716#endif
ecf4d660
DSH		 1717 if (!custom_ext_add(s, 1, &ret, limit, al))
1718 return NULL;
5e3ff62c
DSH		 1719#ifdef TLSEXT_TYPE_encrypt_then_mac
1720 if (s->s3->flags & TLS1_FLAGS_ENCRYPT_THEN_MAC)
1721 {
5a3d8eeb 1722 /* Don't use encrypt_then_mac if AEAD or RC4
f3014206 1723 * might want to disable for other cases too.
5e3ff62c 1724 */
f3014206 1725 if (s->s3->tmp.new_cipher->algorithm_mac == SSL_AEAD
5a3d8eeb 1726 || s->s3->tmp.new_cipher->algorithm_enc == SSL_RC4)
5e3ff62c
DSH		 1727 s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
1728 else
1729 {
1730 s2n(TLSEXT_TYPE_encrypt_then_mac,ret);
1731 s2n(0,ret);
1732 }
1733 }
1734#endif
a398f821 1735
6f017a8f
AL		 1736 if (s->s3->alpn_selected)
1737 {
1738 const unsigned char *selected = s->s3->alpn_selected;
1739 unsigned len = s->s3->alpn_selected_len;
1740
1741 if ((long)(limit - ret - 4 - 2 - 1 - len) < 0)
1742 return NULL;
1743 s2n(TLSEXT_TYPE_application_layer_protocol_negotiation,ret);
1744 s2n(3 + len,ret);
1745 s2n(1 + len,ret);
1746 *ret++ = len;
1747 memcpy(ret, selected, len);
1748 ret += len;
1749 }
1750
5a3d8eeb
DSH		 1751 done:
1752
22a10c89
BL		 1753 if ((extdatalen = ret-orig-2)== 0)
1754 return orig;
ed3883d2 1755
22a10c89 1756 s2n(extdatalen, orig);
ed3883d2 1757 return ret;
52b8dad8 1758 }
ed3883d2 1759
6f017a8f
AL		 1760/* tls1_alpn_handle_client_hello is called to process the ALPN extension in a
1761 * ClientHello.
1762 * data: the contents of the extension, not including the type and length.
1763 * data_len: the number of bytes in |data|
1764 * al: a pointer to the alert value to send in the event of a non-zero
1765 * return.
1766 *
1767 * returns: 0 on success. */
1768static int tls1_alpn_handle_client_hello(SSL *s, const unsigned char *data,
1769 unsigned data_len, int *al)
1770 {
1771 unsigned i;
1772 unsigned proto_len;
1773 const unsigned char *selected;
1774 unsigned char selected_len;
1775 int r;
1776
1777 if (s->ctx->alpn_select_cb == NULL)
1778 return 0;
1779
1780 if (data_len < 2)
1781 goto parse_error;
1782
1783 /* data should contain a uint16 length followed by a series of 8-bit,
1784 * length-prefixed strings. */
1785 i = ((unsigned) data[0]) << 8 |
1786 ((unsigned) data[1]);
1787 data_len -= 2;
1788 data += 2;
1789 if (data_len != i)
1790 goto parse_error;
1791
1792 if (data_len < 2)
1793 goto parse_error;
1794
1795 for (i = 0; i < data_len;)
1796 {
1797 proto_len = data[i];
1798 i++;
1799
1800 if (proto_len == 0)
1801 goto parse_error;
1802
1803 if (i + proto_len < i || i + proto_len > data_len)
1804 goto parse_error;
1805
1806 i += proto_len;
1807 }
1808
1809 r = s->ctx->alpn_select_cb(s, &selected, &selected_len, data, data_len,
1810 s->ctx->alpn_select_cb_arg);
1811 if (r == SSL_TLSEXT_ERR_OK) {
1812 if (s->s3->alpn_selected)
1813 OPENSSL_free(s->s3->alpn_selected);
1814 s->s3->alpn_selected = OPENSSL_malloc(selected_len);
1815 if (!s->s3->alpn_selected)
1816 {
1817 *al = SSL_AD_INTERNAL_ERROR;
1818 return -1;
1819 }
1820 memcpy(s->s3->alpn_selected, selected, selected_len);
1821 s->s3->alpn_selected_len = selected_len;
1822 }
1823 return 0;
1824
1825parse_error:
1826 *al = SSL_AD_DECODE_ERROR;
1827 return -1;
1828 }
1829
dece3209
RS		 1830#ifndef OPENSSL_NO_EC
1831/* ssl_check_for_safari attempts to fingerprint Safari using OS X
1832 * SecureTransport using the TLS extension block in |d|, of length |n|.
1833 * Safari, since 10.6, sends exactly these extensions, in this order:
1834 * SNI,
1835 * elliptic_curves
1836 * ec_point_formats
1837 *
1838 * We wish to fingerprint Safari because they broke ECDHE-ECDSA support in 10.8,
1839 * but they advertise support. So enabling ECDHE-ECDSA ciphers breaks them.
1840 * Sadly we cannot differentiate 10.6, 10.7 and 10.8.4 (which work), from
1841 * 10.8..10.8.3 (which don't work).
1842 */
1843static void ssl_check_for_safari(SSL *s, const unsigned char *data, const unsigned char *d, int n) {
1844 unsigned short type, size;
1845 static const unsigned char kSafariExtensionsBlock[] = {
1846 0x00, 0x0a, /* elliptic_curves extension */
1847 0x00, 0x08, /* 8 bytes */
1848 0x00, 0x06, /* 6 bytes of curve ids */
1849 0x00, 0x17, /* P-256 */
1850 0x00, 0x18, /* P-384 */
1851 0x00, 0x19, /* P-521 */
1852
1853 0x00, 0x0b, /* ec_point_formats */
1854 0x00, 0x02, /* 2 bytes */
1855 0x01, /* 1 point format */
1856 0x00, /* uncompressed */
1857 };
1858
1859 /* The following is only present in TLS 1.2 */
1860 static const unsigned char kSafariTLS12ExtensionsBlock[] = {
1861 0x00, 0x0d, /* signature_algorithms */
1862 0x00, 0x0c, /* 12 bytes */
1863 0x00, 0x0a, /* 10 bytes */
1864 0x05, 0x01, /* SHA-384/RSA */
1865 0x04, 0x01, /* SHA-256/RSA */
1866 0x02, 0x01, /* SHA-1/RSA */
1867 0x04, 0x03, /* SHA-256/ECDSA */
1868 0x02, 0x03, /* SHA-1/ECDSA */
1869 };
1870
1871 if (data >= (d+n-2))
1872 return;
1873 data += 2;
1874
1875 if (data > (d+n-4))
1876 return;
1877 n2s(data,type);
1878 n2s(data,size);
1879
1880 if (type != TLSEXT_TYPE_server_name)
1881 return;
1882
1883 if (data+size > d+n)
1884 return;
1885 data += size;
1886
378341e1 1887 if (TLS1_get_client_version(s) >= TLS1_2_VERSION)
dece3209
RS		 1888 {
1889 const size_t len1 = sizeof(kSafariExtensionsBlock);
1890 const size_t len2 = sizeof(kSafariTLS12ExtensionsBlock);
1891
1892 if (data + len1 + len2 != d+n)
1893 return;
1894 if (memcmp(data, kSafariExtensionsBlock, len1) != 0)
1895 return;
1896 if (memcmp(data + len1, kSafariTLS12ExtensionsBlock, len2) != 0)
1897 return;
1898 }
1899 else
1900 {
1901 const size_t len = sizeof(kSafariExtensionsBlock);
1902
1903 if (data + len != d+n)
1904 return;
1905 if (memcmp(data, kSafariExtensionsBlock, len) != 0)
1906 return;
1907 }
1908
1909 s->s3->is_probably_safari = 1;
1910}
cbf81235 1911#endif /* !OPENSSL_NO_EC */
dece3209 1912
ecf4d660 1913
b2284ed3
DSH		 1914static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1915 {
ed3883d2
BM		 1916 unsigned short type;
1917 unsigned short size;
1918 unsigned short len;
f1fd4544 1919 unsigned char *data = *p;
860c3dd1
DSH		 1920 int renegotiate_seen = 0;
1921
a13c20f6 1922 s->servername_done = 0;
67c8e7f4 1923 s->tlsext_status_type = -1;
6f31dd72
BM		 1924#ifndef OPENSSL_NO_NEXTPROTONEG
1925 s->s3->next_proto_neg_seen = 0;
1926#endif
ed3883d2 1927
6f017a8f
AL		 1928 if (s->s3->alpn_selected)
1929 {
1930 OPENSSL_free(s->s3->alpn_selected);
1931 s->s3->alpn_selected = NULL;
1932 }
1933
4817504d
DSH		 1934#ifndef OPENSSL_NO_HEARTBEATS
1935 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
1936 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
1937#endif
dece3209
RS		 1938
1939#ifndef OPENSSL_NO_EC
1940 if (s->options & SSL_OP_SAFARI_ECDHE_ECDSA_BUG)
1941 ssl_check_for_safari(s, data, d, n);
cbf81235 1942#endif /* !OPENSSL_NO_EC */
dece3209 1943
4453cd8c
DSH		 1944 /* Clear any signature algorithms extension received */
1945 if (s->cert->peer_sigalgs)
1946 {
1947 OPENSSL_free(s->cert->peer_sigalgs);
1948 s->cert->peer_sigalgs = NULL;
1949 }
4817504d 1950
5e3ff62c
DSH		 1951#ifdef TLSEXT_TYPE_encrypt_then_mac
1952 s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
1953#endif
1954
ed3883d2 1955 if (data >= (d+n-2))
c27c9cb4 1956 goto ri_check;
ed3883d2
BM		 1957 n2s(data,len);
1958
52b8dad8 1959 if (data > (d+n-len))
c27c9cb4 1960 goto ri_check;
ed3883d2 1961
f1fd4544
BM		 1962 while (data <= (d+n-4))
1963 {
ed3883d2
BM		 1964 n2s(data,type);
1965 n2s(data,size);
1966
1967 if (data+size > (d+n))
c27c9cb4 1968 goto ri_check;
8e3b2dbb 1969#if 0
0e1dba93 1970 fprintf(stderr,"Received extension type %d size %d\n",type,size);
8e3b2dbb 1971#endif
6434abbf
DSH		 1972 if (s->tlsext_debug_cb)
1973 s->tlsext_debug_cb(s, 0, type, data, size,
1974 s->tlsext_debug_arg);
5a3d8eeb
DSH		 1975 if (type == TLSEXT_TYPE_renegotiate)
1976 {
1977 if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
1978 return 0;
1979 renegotiate_seen = 1;
1980 }
1981 else if (s->version == SSL3_VERSION)
1982 {}
a13c20f6
BM		 1983/* The servername extension is treated as follows:
1984
1985 - Only the hostname type is supported with a maximum length of 255.
1986 - The servername is rejected if too long or if it contains zeros,
1987 in which case an fatal alert is generated.
1988 - The servername field is maintained together with the session cache.
1989 - When a session is resumed, the servername call back invoked in order
1990 to allow the application to position itself to the right context.
1991 - The servername is acknowledged if it is new for a session or when
1992 it is identical to a previously used for the same session.
1993 Applications can control the behaviour. They can at any time
1994 set a 'desirable' servername for a new SSL object. This can be the
1995 case for example with HTTPS when a Host: header field is received and
1996 a renegotiation is requested. In this case, a possible servername
1997 presented in the new client hello is only acknowledged if it matches
1998 the value of the Host: field.
1999 - Applications must use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
2000 if they provide for changing an explicit servername context for the session,
2001 i.e. when the session has been established with a servername extension.
2002 - On session reconnect, the servername extension may be absent.
2003
2004*/
2005
5a3d8eeb 2006 else if (type == TLSEXT_TYPE_server_name)
f1fd4544 2007 {
a70183bc 2008 unsigned char *sdata;
ed3883d2 2009 int servname_type;
a70183bc
BM		 2010 int dsize;
2011
2012 if (size < 2)
2013 {
2014 *al = SSL_AD_DECODE_ERROR;
2015 return 0;
2016 }
2017 n2s(data,dsize);
52b8dad8 2018 size -= 2;
a70183bc 2019 if (dsize > size )
f1fd4544 2020 {
a70183bc
BM		 2021 *al = SSL_AD_DECODE_ERROR;
2022 return 0;
2023 }
2024
2025 sdata = data;
2026 while (dsize > 3)
2027 {
2028 servname_type = *(sdata++);
ed3883d2 2029 n2s(sdata,len);
a70183bc
BM		 2030 dsize -= 3;
2031
2032 if (len > dsize)
f1fd4544
BM		 2033 {
2034 *al = SSL_AD_DECODE_ERROR;
2035 return 0;
2036 }
a70183bc 2037 if (s->servername_done == 0)
f1fd4544
BM		 2038 switch (servname_type)
2039 {
2040 case TLSEXT_NAMETYPE_host_name:
732d31be 2041 if (!s->hit)
f1fd4544 2042 {
732d31be
DSH		 2043 if(s->session->tlsext_hostname)
2044 {
2045 *al = SSL_AD_DECODE_ERROR;
2046 return 0;
2047 }
2048 if (len > TLSEXT_MAXLEN_host_name)
f1fd4544
BM		 2049 {
2050 *al = TLS1_AD_UNRECOGNIZED_NAME;
2051 return 0;
2052 }
732d31be
DSH		 2053 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
2054 {
2055 *al = TLS1_AD_INTERNAL_ERROR;
2056 return 0;
2057 }
ed3883d2 2058 memcpy(s->session->tlsext_hostname, sdata, len);
a13c20f6
BM		 2059 s->session->tlsext_hostname[len]='\0';
2060 if (strlen(s->session->tlsext_hostname) != len) {
2061 OPENSSL_free(s->session->tlsext_hostname);
40a70628 2062 s->session->tlsext_hostname = NULL;
a13c20f6
BM		 2063 *al = TLS1_AD_UNRECOGNIZED_NAME;
2064 return 0;
f1fd4544 2065 }
a13c20f6
BM		 2066 s->servername_done = 1;
2067
a13c20f6
BM		 2068 }
2069 else
732d31be
DSH		 2070 s->servername_done = s->session->tlsext_hostname
2071 && strlen(s->session->tlsext_hostname) == len
6b9e941e 2072 && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
a13c20f6 2073
ed3883d2 2074 break;
f1fd4544 2075
ed3883d2
BM		 2076 default:
2077 break;
f1fd4544 2078 }
52b8dad8 2079
a70183bc 2080 dsize -= len;
f1fd4544 2081 }
a70183bc
BM		 2082 if (dsize != 0)
2083 {
2084 *al = SSL_AD_DECODE_ERROR;
2085 return 0;
2086 }
2087
ed3883d2 2088 }
edc032b5
BL		 2089#ifndef OPENSSL_NO_SRP
2090 else if (type == TLSEXT_TYPE_srp)
2091 {
1df80b65
DSH		 2092 if (size <= 0 || ((len = data[0])) != (size -1))
2093 {
2094 *al = SSL_AD_DECODE_ERROR;
2095 return 0;
2096 }
2097 if (s->srp_ctx.login != NULL)
edc032b5 2098 {
1df80b65
DSH		 2099 *al = SSL_AD_DECODE_ERROR;
2100 return 0;
2101 }
2102 if ((s->srp_ctx.login = OPENSSL_malloc(len+1)) == NULL)
2103 return -1;
2104 memcpy(s->srp_ctx.login, &data[1], len);
2105 s->srp_ctx.login[len]='\0';
2106
2107 if (strlen(s->srp_ctx.login) != len)
2108 {
2109 *al = SSL_AD_DECODE_ERROR;
2110 return 0;
edc032b5
BL		 2111 }
2112 }
2113#endif
ed3883d2 2114
36ca4ba6 2115#ifndef OPENSSL_NO_EC
874a18cf 2116 else if (type == TLSEXT_TYPE_ec_point_formats)
36ca4ba6
BM		 2117 {
2118 unsigned char *sdata = data;
2119 int ecpointformatlist_length = *(sdata++);
36ca4ba6 2120
e83aefb3
DSH		 2121 if (ecpointformatlist_length != size - 1 ||
2122 ecpointformatlist_length < 1)
36ca4ba6
BM		 2123 {
2124 *al = TLS1_AD_DECODE_ERROR;
2125 return 0;
2126 }
732d31be 2127 if (!s->hit)
36ca4ba6 2128 {
732d31be
DSH		 2129 if(s->session->tlsext_ecpointformatlist)
2130 {
7d5686d3
DSH		 2131 OPENSSL_free(s->session->tlsext_ecpointformatlist);
2132 s->session->tlsext_ecpointformatlist = NULL;
732d31be
DSH		 2133 }
2134 s->session->tlsext_ecpointformatlist_length = 0;
2135 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2136 {
2137 *al = TLS1_AD_INTERNAL_ERROR;
2138 return 0;
2139 }
2140 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2141 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
36ca4ba6 2142 }
36ca4ba6
BM		 2143#if 0
2144 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
2145 sdata = s->session->tlsext_ecpointformatlist;
2146 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2147 fprintf(stderr,"%i ",*(sdata++));
2148 fprintf(stderr,"\n");
33273721
BM		 2149#endif
2150 }
874a18cf 2151 else if (type == TLSEXT_TYPE_elliptic_curves)
33273721
BM		 2152 {
2153 unsigned char *sdata = data;
2154 int ellipticcurvelist_length = (*(sdata++) << 8);
2155 ellipticcurvelist_length += (*(sdata++));
2156
e83aefb3 2157 if (ellipticcurvelist_length != size - 2 ||
33d5ba86
EK		 2158 ellipticcurvelist_length < 1 ||
2159 /* Each NamedCurve is 2 bytes. */
2160 ellipticcurvelist_length & 1)
33273721
BM		 2161 {
2162 *al = TLS1_AD_DECODE_ERROR;
2163 return 0;
2164 }
732d31be 2165 if (!s->hit)
33273721 2166 {
732d31be
DSH		 2167 if(s->session->tlsext_ellipticcurvelist)
2168 {
2169 *al = TLS1_AD_DECODE_ERROR;
2170 return 0;
2171 }
2172 s->session->tlsext_ellipticcurvelist_length = 0;
2173 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
2174 {
2175 *al = TLS1_AD_INTERNAL_ERROR;
2176 return 0;
2177 }
2178 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
2179 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
33273721 2180 }
33273721
BM		 2181#if 0
2182 fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
2183 sdata = s->session->tlsext_ellipticcurvelist;
2184 for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
2185 fprintf(stderr,"%i ",*(sdata++));
2186 fprintf(stderr,"\n");
36ca4ba6
BM		 2187#endif
2188 }
c6a27f01 2189#endif /* OPENSSL_NO_EC */
761772d7 2190#ifdef TLSEXT_TYPE_opaque_prf_input
874a18cf 2191 else if (type == TLSEXT_TYPE_opaque_prf_input)
761772d7
BM		 2192 {
2193 unsigned char *sdata = data;
2194
2195 if (size < 2)
2196 {
2197 *al = SSL_AD_DECODE_ERROR;
2198 return 0;
2199 }
2200 n2s(sdata, s->s3->client_opaque_prf_input_len);
2201 if (s->s3->client_opaque_prf_input_len != size - 2)
2202 {
2203 *al = SSL_AD_DECODE_ERROR;
2204 return 0;
2205 }
2206
2207 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2208 OPENSSL_free(s->s3->client_opaque_prf_input);
02c27b11
BM		 2209 if (s->s3->client_opaque_prf_input_len == 0)
2210 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2211 else
2212 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
761772d7
BM		 2213 if (s->s3->client_opaque_prf_input == NULL)
2214 {
2215 *al = TLS1_AD_INTERNAL_ERROR;
2216 return 0;
2217 }
2218 }
2219#endif
12bf56c0
DSH		 2220 else if (type == TLSEXT_TYPE_session_ticket)
2221 {
2222 if (s->tls_session_ticket_ext_cb &&
2223 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2224 {
2225 *al = TLS1_AD_INTERNAL_ERROR;
2226 return 0;
2227 }
2228 }
6b7be581
DSH		 2229 else if (type == TLSEXT_TYPE_signature_algorithms)
2230 {
2231 int dsize;
4453cd8c 2232 if (s->cert->peer_sigalgs || size < 2)
6b7be581
DSH		 2233 {
2234 *al = SSL_AD_DECODE_ERROR;
2235 return 0;
2236 }
6b7be581
DSH		 2237 n2s(data,dsize);
2238 size -= 2;
4453cd8c 2239 if (dsize != size || dsize & 1 || !dsize)
6b7be581
DSH		 2240 {
2241 *al = SSL_AD_DECODE_ERROR;
2242 return 0;
2243 }
c800c27a 2244 if (!tls1_save_sigalgs(s, data, dsize))
6b7be581
DSH		 2245 {
2246 *al = SSL_AD_DECODE_ERROR;
2247 return 0;
2248 }
2249 }
d0b039d4 2250 else if (type == TLSEXT_TYPE_status_request)
67c8e7f4
DSH		 2251 {
2252
2253 if (size < 5)
2254 {
2255 *al = SSL_AD_DECODE_ERROR;
2256 return 0;
2257 }
2258
2259 s->tlsext_status_type = *data++;
2260 size--;
2261 if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
2262 {
2263 const unsigned char *sdata;
2264 int dsize;
2265 /* Read in responder_id_list */
2266 n2s(data,dsize);
2267 size -= 2;
2268 if (dsize > size )
2269 {
2270 *al = SSL_AD_DECODE_ERROR;
2271 return 0;
2272 }
2273 while (dsize > 0)
2274 {
2275 OCSP_RESPID *id;
2276 int idsize;
2277 if (dsize < 4)
2278 {
2279 *al = SSL_AD_DECODE_ERROR;
2280 return 0;
2281 }
2282 n2s(data, idsize);
2283 dsize -= 2 + idsize;
9770924f 2284 size -= 2 + idsize;
67c8e7f4
DSH		 2285 if (dsize < 0)
2286 {
2287 *al = SSL_AD_DECODE_ERROR;
2288 return 0;
2289 }
2290 sdata = data;
2291 data += idsize;
2292 id = d2i_OCSP_RESPID(NULL,
2293 &sdata, idsize);
2294 if (!id)
2295 {
2296 *al = SSL_AD_DECODE_ERROR;
2297 return 0;
2298 }
2299 if (data != sdata)
2300 {
2301 OCSP_RESPID_free(id);
2302 *al = SSL_AD_DECODE_ERROR;
2303 return 0;
2304 }
2305 if (!s->tlsext_ocsp_ids
2306 && !(s->tlsext_ocsp_ids =
2307 sk_OCSP_RESPID_new_null()))
2308 {
2309 OCSP_RESPID_free(id);
2310 *al = SSL_AD_INTERNAL_ERROR;
2311 return 0;
2312 }
2313 if (!sk_OCSP_RESPID_push(
2314 s->tlsext_ocsp_ids, id))
2315 {
2316 OCSP_RESPID_free(id);
2317 *al = SSL_AD_INTERNAL_ERROR;
2318 return 0;
2319 }
2320 }
2321
2322 /* Read in request_extensions */
9770924f
BM		 2323 if (size < 2)
2324 {
2325 *al = SSL_AD_DECODE_ERROR;
2326 return 0;
2327 }
67c8e7f4
DSH		 2328 n2s(data,dsize);
2329 size -= 2;
9770924f 2330 if (dsize != size)
67c8e7f4
DSH		 2331 {
2332 *al = SSL_AD_DECODE_ERROR;
2333 return 0;
2334 }
2335 sdata = data;
2336 if (dsize > 0)
2337 {
25536ea6
DSH		 2338 if (s->tlsext_ocsp_exts)
2339 {
2340 sk_X509_EXTENSION_pop_free(s->tlsext_ocsp_exts,
2341 X509_EXTENSION_free);
2342 }
2343
67c8e7f4
DSH		 2344 s->tlsext_ocsp_exts =
2345 d2i_X509_EXTENSIONS(NULL,
2346 &sdata, dsize);
2347 if (!s->tlsext_ocsp_exts
2348 || (data + dsize != sdata))
2349 {
2350 *al = SSL_AD_DECODE_ERROR;
2351 return 0;
2352 }
2353 }
2354 }
2355 /* We don't know what to do with any other type
2356 * so ignore it.
2357 */
2358 else
2359 s->tlsext_status_type = -1;
2360 }
4817504d
DSH		 2361#ifndef OPENSSL_NO_HEARTBEATS
2362 else if (type == TLSEXT_TYPE_heartbeat)
2363 {
2364 switch(data[0])
2365 {
2366 case 0x01: /* Client allows us to send HB requests */
2367 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2368 break;
2369 case 0x02: /* Client doesn't accept HB requests */
2370 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2371 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2372 break;
192540b5
DSH		 2373 default: *al = SSL_AD_ILLEGAL_PARAMETER;
2374 return 0;
4817504d
DSH		 2375 }
2376 }
2377#endif
bf48836c 2378#ifndef OPENSSL_NO_NEXTPROTONEG
ee2ffc27 2379 else if (type == TLSEXT_TYPE_next_proto_neg &&
6f017a8f
AL		 2380 s->s3->tmp.finish_md_len == 0 &&
2381 s->s3->alpn_selected == NULL)
ee2ffc27
BL		 2382 {
2383 /* We shouldn't accept this extension on a
2384 * renegotiation.
2385 *
2386 * s->new_session will be set on renegotiation, but we
2387 * probably shouldn't rely that it couldn't be set on
2388 * the initial renegotation too in certain cases (when
2389 * there's some other reason to disallow resuming an
2390 * earlier session -- the current code won't be doing
2391 * anything like that, but this might change).
2392
2393 * A valid sign that there's been a previous handshake
2394 * in this connection is if s->s3->tmp.finish_md_len >
2395 * 0. (We are talking about a check that will happen
2396 * in the Hello protocol round, well before a new
2397 * Finished message could have been computed.) */
2398 s->s3->next_proto_neg_seen = 1;
2399 }
2400#endif
761772d7 2401
6f017a8f
AL		 2402 else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation &&
2403 s->ctx->alpn_select_cb &&
2404 s->s3->tmp.finish_md_len == 0)
2405 {
2406 if (tls1_alpn_handle_client_hello(s, data, size, al) != 0)
2407 return 0;
2911575c 2408#ifndef OPENSSL_NO_NEXTPROTONEG
6f017a8f
AL		 2409 /* ALPN takes precedence over NPN. */
2410 s->s3->next_proto_neg_seen = 0;
2911575c 2411#endif
6f017a8f
AL		 2412 }
2413
6434abbf 2414 /* session ticket processed earlier */
e659eff2
MC		 2415 else if (SSL_IS_DTLS(s) && SSL_get_srtp_profiles(s)
2416 && type == TLSEXT_TYPE_use_srtp)
333f926d
BL		 2417 {
2418 if(ssl_parse_clienthello_use_srtp_ext(s, data, size,
2419 al))
2420 return 0;
2421 }
4b6dee2b
DSH		 2422#ifdef TLSEXT_TYPE_encrypt_then_mac
2423 else if (type == TLSEXT_TYPE_encrypt_then_mac)
5a3d8eeb 2424 s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
4b6dee2b 2425#endif
a398f821
T		 2426 /* If this ClientHello extension was unhandled and this is
2427 * a nonresumed connection, check whether the extension is a
2428 * custom TLS Extension (has a custom_srv_ext_record), and if
2429 * so call the callback and record the extension number so that
2430 * an appropriate ServerHello may be later returned.
2431 */
ecf4d660 2432 else if (!s->hit)
a398f821 2433 {
33f653ad 2434 if (custom_ext_parse(s, 1, type, data, size, al) <= 0)
ecf4d660 2435 return 0;
a398f821
T		 2436 }
2437
6434abbf 2438 data+=size;
f1fd4544 2439 }
a9e1c50b 2440
f1fd4544 2441 *p = data;
c27c9cb4
DSH		 2442
2443 ri_check:
2444
2445 /* Need RI if renegotiating */
2446
bdd53508 2447 if (!renegotiate_seen && s->renegotiate &&
c27c9cb4
DSH		 2448 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
2449 {
fbed9f81 2450 *al = SSL_AD_HANDSHAKE_FAILURE;
aa09c2c6 2451 SSLerr(SSL_F_SSL_SCAN_CLIENTHELLO_TLSEXT,
c27c9cb4
DSH		 2452 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2453 return 0;
2454 }
2455
f1fd4544 2456 return 1;
52b8dad8 2457 }
f1fd4544 2458
b2284ed3
DSH		 2459int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
2460 {
2461 int al = -1;
28ea0a0c 2462 custom_ext_init(&s->cert->srv_ext);
b2284ed3
DSH		 2463 if (ssl_scan_clienthello_tlsext(s, p, d, n, &al) <= 0)
2464 {
2465 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2466 return 0;
2467 }
2468
2daceb03 2469 if (ssl_check_clienthello_tlsext_early(s) <= 0)
b2284ed3 2470 {
aa09c2c6 2471 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,SSL_R_CLIENTHELLO_TLSEXT);
b2284ed3
DSH		 2472 return 0;
2473 }
2474 return 1;
2475}
2476
bf48836c 2477#ifndef OPENSSL_NO_NEXTPROTONEG
ee2ffc27
BL		 2478/* ssl_next_proto_validate validates a Next Protocol Negotiation block. No
2479 * elements of zero length are allowed and the set of elements must exactly fill
2480 * the length of the block. */
71fa4513 2481static char ssl_next_proto_validate(unsigned char *d, unsigned len)
ee2ffc27
BL		 2482 {
2483 unsigned int off = 0;
2484
2485 while (off < len)
2486 {
2487 if (d[off] == 0)
2488 return 0;
2489 off += d[off];
2490 off++;
2491 }
2492
2493 return off == len;
2494 }
2495#endif
2496
09e4e4b9 2497static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
f1fd4544 2498 {
c8bbd98a 2499 unsigned short length;
ed3883d2
BM		 2500 unsigned short type;
2501 unsigned short size;
ed3883d2 2502 unsigned char *data = *p;
ed3883d2 2503 int tlsext_servername = 0;
860c3dd1 2504 int renegotiate_seen = 0;
ed3883d2 2505
6f31dd72
BM		 2506#ifndef OPENSSL_NO_NEXTPROTONEG
2507 s->s3->next_proto_neg_seen = 0;
2508#endif
e94a6c0e 2509 s->tlsext_ticket_expected = 0;
6f31dd72 2510
6f017a8f
AL		 2511 if (s->s3->alpn_selected)
2512 {
2513 OPENSSL_free(s->s3->alpn_selected);
2514 s->s3->alpn_selected = NULL;
2515 }
2516
4817504d
DSH		 2517#ifndef OPENSSL_NO_HEARTBEATS
2518 s->tlsext_heartbeat &= ~(SSL_TLSEXT_HB_ENABLED |
2519 SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
2520#endif
2521
5e3ff62c
DSH		 2522#ifdef TLSEXT_TYPE_encrypt_then_mac
2523 s->s3->flags &= ~TLS1_FLAGS_ENCRYPT_THEN_MAC;
2524#endif
2525
ed3883d2 2526 if (data >= (d+n-2))
c27c9cb4 2527 goto ri_check;
ed3883d2 2528
c8bbd98a
BL		 2529 n2s(data,length);
2530 if (data+length != d+n)
2531 {
2532 *al = SSL_AD_DECODE_ERROR;
2533 return 0;
2534 }
ed3883d2 2535
f1fd4544
BM		 2536 while(data <= (d+n-4))
2537 {
ed3883d2
BM		 2538 n2s(data,type);
2539 n2s(data,size);
2540
2541 if (data+size > (d+n))
c27c9cb4 2542 goto ri_check;
f1fd4544 2543
6434abbf
DSH		 2544 if (s->tlsext_debug_cb)
2545 s->tlsext_debug_cb(s, 1, type, data, size,
2546 s->tlsext_debug_arg);
2547
5a3d8eeb
DSH		 2548
2549 if (type == TLSEXT_TYPE_renegotiate)
2550 {
2551 if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
2552 return 0;
2553 renegotiate_seen = 1;
2554 }
2555 else if (s->version == SSL3_VERSION)
2556 {}
2557 else if (type == TLSEXT_TYPE_server_name)
f1fd4544
BM		 2558 {
2559 if (s->tlsext_hostname == NULL || size > 0)
2560 {
2561 *al = TLS1_AD_UNRECOGNIZED_NAME;
2562 return 0;
2563 }
ed3883d2 2564 tlsext_servername = 1;
f1fd4544 2565 }
ed3883d2 2566
36ca4ba6 2567#ifndef OPENSSL_NO_EC
874a18cf 2568 else if (type == TLSEXT_TYPE_ec_point_formats)
36ca4ba6
BM		 2569 {
2570 unsigned char *sdata = data;
2571 int ecpointformatlist_length = *(sdata++);
36ca4ba6
BM		 2572
2573 if (ecpointformatlist_length != size - 1)
2574 {
2575 *al = TLS1_AD_DECODE_ERROR;
2576 return 0;
2577 }
fb0bc2b2 2578 if (!s->hit)
36ca4ba6 2579 {
fb0bc2b2
GT		 2580 s->session->tlsext_ecpointformatlist_length = 0;
2581 if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
2582 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
2583 {
2584 *al = TLS1_AD_INTERNAL_ERROR;
2585 return 0;
2586 }
2587 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
2588 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
36ca4ba6 2589 }
36ca4ba6
BM		 2590#if 0
2591 fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
2592 sdata = s->session->tlsext_ecpointformatlist;
2593 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
2594 fprintf(stderr,"%i ",*(sdata++));
2595 fprintf(stderr,"\n");
2596#endif
2597 }
c6a27f01 2598#endif /* OPENSSL_NO_EC */
6434abbf
DSH		 2599
2600 else if (type == TLSEXT_TYPE_session_ticket)
2601 {
12bf56c0
DSH		 2602 if (s->tls_session_ticket_ext_cb &&
2603 !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
2604 {
2605 *al = TLS1_AD_INTERNAL_ERROR;
2606 return 0;
2607 }
b362ccab 2608 if (!tls_use_ticket(s) || (size > 0))
6434abbf
DSH		 2609 {
2610 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2611 return 0;
2612 }
2613 s->tlsext_ticket_expected = 1;
2614 }
761772d7 2615#ifdef TLSEXT_TYPE_opaque_prf_input
874a18cf 2616 else if (type == TLSEXT_TYPE_opaque_prf_input)
761772d7
BM		 2617 {
2618 unsigned char *sdata = data;
2619
2620 if (size < 2)
2621 {
2622 *al = SSL_AD_DECODE_ERROR;
2623 return 0;
2624 }
2625 n2s(sdata, s->s3->server_opaque_prf_input_len);
2626 if (s->s3->server_opaque_prf_input_len != size - 2)
2627 {
2628 *al = SSL_AD_DECODE_ERROR;
2629 return 0;
2630 }
2631
2632 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2633 OPENSSL_free(s->s3->server_opaque_prf_input);
02c27b11
BM		 2634 if (s->s3->server_opaque_prf_input_len == 0)
2635 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2636 else
2637 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
761772d7
BM		 2638
2639 if (s->s3->server_opaque_prf_input == NULL)
2640 {
2641 *al = TLS1_AD_INTERNAL_ERROR;
2642 return 0;
2643 }
2644 }
2645#endif
874a18cf 2646 else if (type == TLSEXT_TYPE_status_request)
67c8e7f4
DSH		 2647 {
2648 /* MUST be empty and only sent if we've requested
2649 * a status request message.
2650 */
2651 if ((s->tlsext_status_type == -1) || (size > 0))
2652 {
2653 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2654 return 0;
2655 }
2656 /* Set flag to expect CertificateStatus message */
2657 s->tlsext_status_expected = 1;
2658 }
bf48836c 2659#ifndef OPENSSL_NO_NEXTPROTONEG
6f31dd72
BM		 2660 else if (type == TLSEXT_TYPE_next_proto_neg &&
2661 s->s3->tmp.finish_md_len == 0)
ee2ffc27
BL		 2662 {
2663 unsigned char *selected;
2664 unsigned char selected_len;
2665
2666 /* We must have requested it. */
eef69354 2667 if (s->ctx->next_proto_select_cb == NULL)
ee2ffc27
BL		 2668 {
2669 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2670 return 0;
2671 }
2672 /* The data must be valid */
2673 if (!ssl_next_proto_validate(data, size))
2674 {
2675 *al = TLS1_AD_DECODE_ERROR;
2676 return 0;
2677 }
2678 if (s->ctx->next_proto_select_cb(s, &selected, &selected_len, data, size, s->ctx->next_proto_select_cb_arg) != SSL_TLSEXT_ERR_OK)
2679 {
2680 *al = TLS1_AD_INTERNAL_ERROR;
2681 return 0;
2682 }
2683 s->next_proto_negotiated = OPENSSL_malloc(selected_len);
2684 if (!s->next_proto_negotiated)
2685 {
2686 *al = TLS1_AD_INTERNAL_ERROR;
2687 return 0;
2688 }
2689 memcpy(s->next_proto_negotiated, selected, selected_len);
2690 s->next_proto_negotiated_len = selected_len;
6f31dd72 2691 s->s3->next_proto_neg_seen = 1;
ee2ffc27
BL		 2692 }
2693#endif
6f017a8f
AL		 2694
2695 else if (type == TLSEXT_TYPE_application_layer_protocol_negotiation)
2696 {
2697 unsigned len;
2698
2699 /* We must have requested it. */
2700 if (s->alpn_client_proto_list == NULL)
2701 {
2702 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
2703 return 0;
2704 }
2705 if (size < 4)
2706 {
2707 *al = TLS1_AD_DECODE_ERROR;
2708 return 0;
2709 }
2710 /* The extension data consists of:
2711 * uint16 list_length
2712 * uint8 proto_length;
2713 * uint8 proto[proto_length]; */
2714 len = data[0];
2715 len <<= 8;
2716 len |= data[1];
2717 if (len != (unsigned) size - 2)
2718 {
2719 *al = TLS1_AD_DECODE_ERROR;
2720 return 0;
2721 }
2722 len = data[2];
2723 if (len != (unsigned) size - 3)
2724 {
2725 *al = TLS1_AD_DECODE_ERROR;
2726 return 0;
2727 }
2728 if (s->s3->alpn_selected)
2729 OPENSSL_free(s->s3->alpn_selected);
2730 s->s3->alpn_selected = OPENSSL_malloc(len);
2731 if (!s->s3->alpn_selected)
2732 {
2733 *al = TLS1_AD_INTERNAL_ERROR;
2734 return 0;
2735 }
2736 memcpy(s->s3->alpn_selected, data + 3, len);
2737 s->s3->alpn_selected_len = len;
2738 }
4817504d
DSH		 2739#ifndef OPENSSL_NO_HEARTBEATS
2740 else if (type == TLSEXT_TYPE_heartbeat)
2741 {
2742 switch(data[0])
2743 {
2744 case 0x01: /* Server allows us to send HB requests */
2745 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2746 break;
2747 case 0x02: /* Server doesn't accept HB requests */
2748 s->tlsext_heartbeat |= SSL_TLSEXT_HB_ENABLED;
2749 s->tlsext_heartbeat |= SSL_TLSEXT_HB_DONT_SEND_REQUESTS;
2750 break;
192540b5
DSH		 2751 default: *al = SSL_AD_ILLEGAL_PARAMETER;
2752 return 0;
4817504d
DSH		 2753 }
2754 }
2755#endif
e659eff2 2756 else if (SSL_IS_DTLS(s) && type == TLSEXT_TYPE_use_srtp)
333f926d
BL		 2757 {
2758 if(ssl_parse_serverhello_use_srtp_ext(s, data, size,
2759 al))
2760 return 0;
2761 }
5e3ff62c
DSH		 2762#ifdef TLSEXT_TYPE_encrypt_then_mac
2763 else if (type == TLSEXT_TYPE_encrypt_then_mac)
2764 {
5a3d8eeb 2765 /* Ignore if inappropriate ciphersuite */
f3014206 2766 if (s->s3->tmp.new_cipher->algorithm_mac != SSL_AEAD
5a3d8eeb 2767 && s->s3->tmp.new_cipher->algorithm_enc != SSL_RC4)
5e3ff62c
DSH		 2768 s->s3->flags |= TLS1_FLAGS_ENCRYPT_THEN_MAC;
2769 }
2770#endif
4b6dee2b
DSH		 2771 /* If this extension type was not otherwise handled, but
2772 * matches a custom_cli_ext_record, then send it to the c
2773 * callback */
2774 else if (custom_ext_parse(s, 0, type, data, size, al) <= 0)
2775 return 0;
a9e1c50b
BL		 2776
2777 data += size;
f1fd4544 2778 }
ed3883d2
BM		 2779
2780 if (data != d+n)
f1fd4544
BM		 2781 {
2782 *al = SSL_AD_DECODE_ERROR;
2783 return 0;
2784 }
ed3883d2 2785
f1fd4544
BM		 2786 if (!s->hit && tlsext_servername == 1)
2787 {
2788 if (s->tlsext_hostname)
2789 {
2790 if (s->session->tlsext_hostname == NULL)
2791 {
ed3883d2
BM		 2792 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
2793 if (!s->session->tlsext_hostname)
f1fd4544
BM		 2794 {
2795 *al = SSL_AD_UNRECOGNIZED_NAME;
2796 return 0;
2797 }
2798 }
2799 else
2800 {
2801 *al = SSL_AD_DECODE_ERROR;
2802 return 0;
2803 }
ed3883d2 2804 }
f1fd4544 2805 }
ed3883d2 2806
f1fd4544 2807 *p = data;
c27c9cb4
DSH		 2808
2809 ri_check:
2810
2811 /* Determine if we need to see RI. Strictly speaking if we want to
2812 * avoid an attack we should *always* see RI even on initial server
2813 * hello because the client doesn't see any renegotiation during an
2814 * attack. However this would mean we could not connect to any server
2815 * which doesn't support RI so for the immediate future tolerate RI
2816 * absence on initial connect only.
2817 */
c2c49969
DSH		 2818 if (!renegotiate_seen
2819 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
ef51b4b9 2820 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
c27c9cb4 2821 {
fbed9f81 2822 *al = SSL_AD_HANDSHAKE_FAILURE;
09e4e4b9 2823 SSLerr(SSL_F_SSL_SCAN_SERVERHELLO_TLSEXT,
c27c9cb4
DSH		 2824 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
2825 return 0;
2826 }
2827
f1fd4544 2828 return 1;
52b8dad8 2829 }
ed3883d2 2830
b2172f4f 2831
36ca4ba6
BM		 2832int ssl_prepare_clienthello_tlsext(SSL *s)
2833 {
761772d7
BM		 2834
2835#ifdef TLSEXT_TYPE_opaque_prf_input
2836 {
2837 int r = 1;
2838
2839 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2840 {
2841 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2842 if (!r)
2843 return -1;
2844 }
2845
2846 if (s->tlsext_opaque_prf_input != NULL)
2847 {
2848 if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
2849 OPENSSL_free(s->s3->client_opaque_prf_input);
2850
02c27b11
BM		 2851 if (s->tlsext_opaque_prf_input_len == 0)
2852 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2853 else
2854 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
761772d7
BM		 2855 if (s->s3->client_opaque_prf_input == NULL)
2856 {
2857 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
2858 return -1;
2859 }
2860 s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2861 }
2862
2863 if (r == 2)
2864 /* at callback's request, insist on receiving an appropriate server opaque PRF input */
2865 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2866 }
2867#endif
2868
36ca4ba6 2869 return 1;
52b8dad8 2870 }
36ca4ba6
BM		 2871
2872int ssl_prepare_serverhello_tlsext(SSL *s)
2873 {
36ca4ba6 2874 return 1;
52b8dad8 2875 }
36ca4ba6 2876
2daceb03 2877static int ssl_check_clienthello_tlsext_early(SSL *s)
f1fd4544 2878 {
241520e6 2879 int ret=SSL_TLSEXT_ERR_NOACK;
36ca4ba6
BM		 2880 int al = SSL_AD_UNRECOGNIZED_NAME;
2881
2882#ifndef OPENSSL_NO_EC
33273721
BM		 2883 /* The handling of the ECPointFormats extension is done elsewhere, namely in
2884 * ssl3_choose_cipher in s3_lib.c.
2885 */
2886 /* The handling of the EllipticCurves extension is done elsewhere, namely in
2887 * ssl3_choose_cipher in s3_lib.c.
36ca4ba6
BM		 2888 */
2889#endif
2890
2891 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
2892 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
2893 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
2894 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
2895
761772d7
BM		 2896#ifdef TLSEXT_TYPE_opaque_prf_input
2897 {
2898 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
2899 * but we might be sending an alert in response to the client hello,
2daceb03
BL		 2900 * so this has to happen here in
2901 * ssl_check_clienthello_tlsext_early(). */
761772d7
BM		 2902
2903 int r = 1;
2904
2905 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
2906 {
2907 r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
2908 if (!r)
2909 {
2910 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2911 al = SSL_AD_INTERNAL_ERROR;
2912 goto err;
2913 }
2914 }
2915
2916 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
2917 OPENSSL_free(s->s3->server_opaque_prf_input);
2918 s->s3->server_opaque_prf_input = NULL;
2919
2920 if (s->tlsext_opaque_prf_input != NULL)
2921 {
2922 if (s->s3->client_opaque_prf_input != NULL &&
2923 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
2924 {
2925 /* can only use this extension if we have a server opaque PRF input
2926 * of the same length as the client opaque PRF input! */
2927
02c27b11
BM		 2928 if (s->tlsext_opaque_prf_input_len == 0)
2929 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
2930 else
2931 s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
761772d7
BM		 2932 if (s->s3->server_opaque_prf_input == NULL)
2933 {
2934 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2935 al = SSL_AD_INTERNAL_ERROR;
2936 goto err;
2937 }
2938 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
2939 }
2940 }
2941
2942 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
2943 {
2944 /* The callback wants to enforce use of the extension,
2945 * but we can't do that with the client opaque PRF input;
2946 * abort the handshake.
2947 */
2948 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
2949 al = SSL_AD_HANDSHAKE_FAILURE;
2950 }
2951 }
761772d7
BM		 2952
2953 err:
2daceb03 2954#endif
52b8dad8
BM		 2955 switch (ret)
2956 {
36ca4ba6
BM		 2957 case SSL_TLSEXT_ERR_ALERT_FATAL:
2958 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2959 return -1;
2960
2961 case SSL_TLSEXT_ERR_ALERT_WARNING:
2962 ssl3_send_alert(s,SSL3_AL_WARNING,al);
2963 return 1;
2964
2965 case SSL_TLSEXT_ERR_NOACK:
2966 s->servername_done=0;
2967 default:
2968 return 1;
52b8dad8 2969 }
36ca4ba6 2970 }
f1fd4544 2971
e469af8d
DSH		 2972int tls1_set_server_sigalgs(SSL *s)
2973 {
2974 int al;
2975 size_t i;
2976 /* Clear any shared sigtnature algorithms */
2977 if (s->cert->shared_sigalgs)
2978 {
2979 OPENSSL_free(s->cert->shared_sigalgs);
2980 s->cert->shared_sigalgs = NULL;
2981 }
2982 /* Clear certificate digests and validity flags */
2983 for (i = 0; i < SSL_PKEY_NUM; i++)
2984 {
2985 s->cert->pkeys[i].digest = NULL;
2986 s->cert->pkeys[i].valid_flags = 0;
2987 }
2988
2989 /* If sigalgs received process it. */
2990 if (s->cert->peer_sigalgs)
2991 {
2992 if (!tls1_process_sigalgs(s))
2993 {
2994 SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS,
2995 ERR_R_MALLOC_FAILURE);
2996 al = SSL_AD_INTERNAL_ERROR;
2997 goto err;
2998 }
2999 /* Fatal error is no shared signature algorithms */
3000 if (!s->cert->shared_sigalgs)
3001 {
3002 SSLerr(SSL_F_TLS1_SET_SERVER_SIGALGS,
3003 SSL_R_NO_SHARED_SIGATURE_ALGORITHMS);
3004 al = SSL_AD_ILLEGAL_PARAMETER;
3005 goto err;
3006 }
3007 }
3008 else
3009 ssl_cert_set_default_md(s->cert);
3010 return 1;
3011 err:
3012 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3013 return 0;
3014 }
3015
2daceb03
BL		 3016int ssl_check_clienthello_tlsext_late(SSL *s)
3017 {
3018 int ret = SSL_TLSEXT_ERR_OK;
3019 int al;
3020
3021 /* If status request then ask callback what to do.
3022 * Note: this must be called after servername callbacks in case
3023 * the certificate has changed, and must be called after the cipher
3024 * has been chosen because this may influence which certificate is sent
3025 */
3026 if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
3027 {
3028 int r;
e5db9c3b
DSH		 3029 CERT_PKEY *certpkey;
3030 certpkey = ssl_get_server_send_pkey(s);
3031 /* If no certificate can't return certificate status */
3032 if (certpkey == NULL)
3033 {
3034 s->tlsext_status_expected = 0;
3035 return 1;
3036 }
3037 /* Set current certificate to one we will use so
3038 * SSL_get_certificate et al can pick it up.
3039 */
3040 s->cert->key = certpkey;
2daceb03
BL		 3041 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
3042 switch (r)
3043 {
3044 /* We don't want to send a status request response */
3045 case SSL_TLSEXT_ERR_NOACK:
3046 s->tlsext_status_expected = 0;
3047 break;
3048 /* status request response should be sent */
3049 case SSL_TLSEXT_ERR_OK:
3050 if (s->tlsext_ocsp_resp)
3051 s->tlsext_status_expected = 1;
3052 else
3053 s->tlsext_status_expected = 0;
3054 break;
3055 /* something bad happened */
3056 case SSL_TLSEXT_ERR_ALERT_FATAL:
3057 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3058 al = SSL_AD_INTERNAL_ERROR;
3059 goto err;
3060 }
3061 }
3062 else
3063 s->tlsext_status_expected = 0;
3064
3065 err:
3066 switch (ret)
3067 {
3068 case SSL_TLSEXT_ERR_ALERT_FATAL:
3069 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3070 return -1;
3071
3072 case SSL_TLSEXT_ERR_ALERT_WARNING:
3073 ssl3_send_alert(s, SSL3_AL_WARNING, al);
3074 return 1;
3075
3076 default:
3077 return 1;
3078 }
3079 }
3080
36ca4ba6
BM		 3081int ssl_check_serverhello_tlsext(SSL *s)
3082 {
3083 int ret=SSL_TLSEXT_ERR_NOACK;
58ece833 3084 int al = SSL_AD_UNRECOGNIZED_NAME;
241520e6 3085
36ca4ba6 3086#ifndef OPENSSL_NO_EC
d0205686
DSH		 3087 /* If we are client and using an elliptic curve cryptography cipher
3088 * suite, then if server returns an EC point formats lists extension
3089 * it must contain uncompressed.
36ca4ba6 3090 */
52b8dad8
BM		 3091 unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3092 unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
36ca4ba6 3093 if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
d0205686 3094 (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
4082fea8 3095 ((alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
36ca4ba6
BM		 3096 {
3097 /* we are using an ECC cipher */
90bdfd97 3098 size_t i;
36ca4ba6
BM		 3099 unsigned char *list;
3100 int found_uncompressed = 0;
b9865f11 3101 list = s->session->tlsext_ecpointformatlist;
36ca4ba6
BM		 3102 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
3103 {
3104 if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
3105 {
3106 found_uncompressed = 1;
3107 break;
3108 }
3109 }
3110 if (!found_uncompressed)
3111 {
a291745e 3112 SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
36ca4ba6
BM		 3113 return -1;
3114 }
3115 }
3116 ret = SSL_TLSEXT_ERR_OK;
3117#endif /* OPENSSL_NO_EC */
3118
241520e6 3119 if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
58ece833 3120 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
241520e6 3121 else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
58ece833 3122 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
241520e6 3123
761772d7
BM		 3124#ifdef TLSEXT_TYPE_opaque_prf_input
3125 if (s->s3->server_opaque_prf_input_len > 0)
3126 {
3127 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
3128 * So first verify that we really have a value from the server too. */
3129
3130 if (s->s3->server_opaque_prf_input == NULL)
3131 {
3132 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3133 al = SSL_AD_HANDSHAKE_FAILURE;
3134 }
3135
3136 /* Anytime the server *has* sent an opaque PRF input, we need to check
3137 * that we have a client opaque PRF input of the same size. */
3138 if (s->s3->client_opaque_prf_input == NULL ||
3139 s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
3140 {
3141 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3142 al = SSL_AD_ILLEGAL_PARAMETER;
3143 }
3144 }
3145#endif
3146
04e2ab2c
DSH		 3147 /* If we've requested certificate status and we wont get one
3148 * tell the callback
3149 */
3150 if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
121f9e74 3151 && s->ctx && s->ctx->tlsext_status_cb)
04e2ab2c
DSH		 3152 {
3153 int r;
3154 /* Set resp to NULL, resplen to -1 so callback knows
3155 * there is no response.
3156 */
3157 if (s->tlsext_ocsp_resp)
3158 {
3159 OPENSSL_free(s->tlsext_ocsp_resp);
3160 s->tlsext_ocsp_resp = NULL;
3161 }
3162 s->tlsext_ocsp_resplen = -1;
3163 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
3164 if (r == 0)
3165 {
3166 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
3167 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3168 }
3169 if (r < 0)
3170 {
3171 al = SSL_AD_INTERNAL_ERROR;
3172 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
3173 }
3174 }
3175
52b8dad8
BM		 3176 switch (ret)
3177 {
58ece833
BM		 3178 case SSL_TLSEXT_ERR_ALERT_FATAL:
3179 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3180 return -1;
3181
3182 case SSL_TLSEXT_ERR_ALERT_WARNING:
3183 ssl3_send_alert(s,SSL3_AL_WARNING,al);
3184 return 1;
3185
3186 case SSL_TLSEXT_ERR_NOACK:
3187 s->servername_done=0;
3188 default:
3189 return 1;
52b8dad8 3190 }
f1fd4544 3191 }
33273721 3192
09e4e4b9
DSH		 3193int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n)
3194 {
3195 int al = -1;
3196 if (s->version < SSL3_VERSION)
3197 return 1;
3198 if (ssl_scan_serverhello_tlsext(s, p, d, n, &al) <= 0)
3199 {
3200 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3201 return 0;
3202 }
3203
3204 if (ssl_check_serverhello_tlsext(s) <= 0)
3205 {
3206 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,SSL_R_SERVERHELLO_TLSEXT);
3207 return 0;
3208 }
3209 return 1;
3210}
3211
c519e89f
BM		 3212/* Since the server cache lookup is done early on in the processing of the
3213 * ClientHello, and other operations depend on the result, we need to handle
3214 * any TLS session ticket extension at the same time.
3215 *
3216 * session_id: points at the session ID in the ClientHello. This code will
3217 * read past the end of this in order to parse out the session ticket
3218 * extension, if any.
3219 * len: the length of the session ID.
3220 * limit: a pointer to the first byte after the ClientHello.
3221 * ret: (output) on return, if a ticket was decrypted, then this is set to
3222 * point to the resulting session.
3223 *
3224 * If s->tls_session_secret_cb is set then we are expecting a pre-shared key
3225 * ciphersuite, in which case we have no use for session tickets and one will
3226 * never be decrypted, nor will s->tlsext_ticket_expected be set to 1.
3227 *
3228 * Returns:
3229 * -1: fatal error, either from parsing or decrypting the ticket.
3230 * 0: no ticket was found (or was ignored, based on settings).
3231 * 1: a zero length extension was found, indicating that the client supports
3232 * session tickets but doesn't currently have one to offer.
3233 * 2: either s->tls_session_secret_cb was set, or a ticket was offered but
3234 * couldn't be decrypted because of a non-fatal error.
3235 * 3: a ticket was successfully decrypted and *ret was set.
3236 *
3237 * Side effects:
3238 * Sets s->tlsext_ticket_expected to 1 if the server will have to issue
3239 * a new session ticket to the client because the client indicated support
3240 * (and s->tls_session_secret_cb is NULL) but the client either doesn't have
3241 * a session ticket or we couldn't use the one it gave us, or if
3242 * s->ctx->tlsext_ticket_key_cb asked to renew the client's ticket.
3243 * Otherwise, s->tlsext_ticket_expected is set to 0.
6434abbf 3244 */
6434abbf 3245int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
c519e89f 3246 const unsigned char *limit, SSL_SESSION **ret)
6434abbf
DSH		 3247 {
3248 /* Point after session ID in client hello */
3249 const unsigned char *p = session_id + len;
3250 unsigned short i;
e8da6a1d 3251
c519e89f
BM		 3252 *ret = NULL;
3253 s->tlsext_ticket_expected = 0;
3254
e8da6a1d 3255 /* If tickets disabled behave as if no ticket present
c519e89f
BM		 3256 * to permit stateful resumption.
3257 */
b362ccab 3258 if (!tls_use_ticket(s))
c519e89f 3259 return 0;
6434abbf 3260 if ((s->version <= SSL3_VERSION) || !limit)
c519e89f 3261 return 0;
6434abbf
DSH		 3262 if (p >= limit)
3263 return -1;
07a9d1a2 3264 /* Skip past DTLS cookie */
cbd64894 3265 if (SSL_IS_DTLS(s))
07a9d1a2
DSH		 3266 {
3267 i = *(p++);
3268 p+= i;
3269 if (p >= limit)
3270 return -1;
3271 }
6434abbf
DSH		 3272 /* Skip past cipher list */
3273 n2s(p, i);
3274 p+= i;
3275 if (p >= limit)
3276 return -1;
3277 /* Skip past compression algorithm list */
3278 i = *(p++);
3279 p += i;
3280 if (p > limit)
3281 return -1;
3282 /* Now at start of extensions */
3283 if ((p + 2) >= limit)
c519e89f 3284 return 0;
6434abbf
DSH		 3285 n2s(p, i);
3286 while ((p + 4) <= limit)
3287 {
3288 unsigned short type, size;
3289 n2s(p, type);
3290 n2s(p, size);
3291 if (p + size > limit)
c519e89f 3292 return 0;
6434abbf
DSH		 3293 if (type == TLSEXT_TYPE_session_ticket)
3294 {
c519e89f 3295 int r;
6434abbf
DSH		 3296 if (size == 0)
3297 {
c519e89f
BM		 3298 /* The client will accept a ticket but doesn't
3299 * currently have one. */
6434abbf 3300 s->tlsext_ticket_expected = 1;
c519e89f 3301 return 1;
6434abbf 3302 }
12bf56c0
DSH		 3303 if (s->tls_session_secret_cb)
3304 {
c519e89f
BM		 3305 /* Indicate that the ticket couldn't be
3306 * decrypted rather than generating the session
3307 * from ticket now, trigger abbreviated
3308 * handshake based on external mechanism to
3309 * calculate the master secret later. */
3310 return 2;
3311 }
3312 r = tls_decrypt_ticket(s, p, size, session_id, len, ret);
3313 switch (r)
3314 {
3315 case 2: /* ticket couldn't be decrypted */
3316 s->tlsext_ticket_expected = 1;
3317 return 2;
3318 case 3: /* ticket was decrypted */
3319 return r;
3320 case 4: /* ticket decrypted but need to renew */
3321 s->tlsext_ticket_expected = 1;
3322 return 3;
3323 default: /* fatal error */
3324 return -1;
12bf56c0 3325 }
6434abbf
DSH		 3326 }
3327 p += size;
3328 }
c519e89f 3329 return 0;
6434abbf
DSH		 3330 }
3331
c519e89f
BM		 3332/* tls_decrypt_ticket attempts to decrypt a session ticket.
3333 *
3334 * etick: points to the body of the session ticket extension.
3335 * eticklen: the length of the session tickets extenion.
3336 * sess_id: points at the session ID.
3337 * sesslen: the length of the session ID.
3338 * psess: (output) on return, if a ticket was decrypted, then this is set to
3339 * point to the resulting session.
3340 *
3341 * Returns:
3342 * -1: fatal error, either from parsing or decrypting the ticket.
3343 * 2: the ticket couldn't be decrypted.
3344 * 3: a ticket was successfully decrypted and *psess was set.
3345 * 4: same as 3, but the ticket needs to be renewed.
3346 */
6434abbf
DSH		 3347static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
3348 const unsigned char *sess_id, int sesslen,
3349 SSL_SESSION **psess)
3350 {
3351 SSL_SESSION *sess;
3352 unsigned char *sdec;
3353 const unsigned char *p;
8a2062fe 3354 int slen, mlen, renew_ticket = 0;
6434abbf
DSH		 3355 unsigned char tick_hmac[EVP_MAX_MD_SIZE];
3356 HMAC_CTX hctx;
3357 EVP_CIPHER_CTX ctx;
661dc143 3358 SSL_CTX *tctx = s->initial_ctx;
8a2062fe
DSH		 3359 /* Need at least keyname + iv + some encrypted data */
3360 if (eticklen < 48)
c519e89f 3361 return 2;
8a2062fe
DSH		 3362 /* Initialize session ticket encryption and HMAC contexts */
3363 HMAC_CTX_init(&hctx);
3364 EVP_CIPHER_CTX_init(&ctx);
661dc143 3365 if (tctx->tlsext_ticket_key_cb)
8a2062fe
DSH		 3366 {
3367 unsigned char *nctick = (unsigned char *)etick;
661dc143 3368 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
8a2062fe
DSH		 3369 &ctx, &hctx, 0);
3370 if (rv < 0)
3371 return -1;
3372 if (rv == 0)
c519e89f 3373 return 2;
8a2062fe
DSH		 3374 if (rv == 2)
3375 renew_ticket = 1;
3376 }
3377 else
3378 {
3379 /* Check key name matches */
661dc143 3380 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
c519e89f 3381 return 2;
661dc143 3382 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
8a2062fe
DSH		 3383 tlsext_tick_md(), NULL);
3384 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
661dc143 3385 tctx->tlsext_tick_aes_key, etick + 16);
8a2062fe 3386 }
6434abbf 3387 /* Attempt to process session ticket, first conduct sanity and
c519e89f
BM		 3388 * integrity checks on ticket.
3389 */
8a2062fe 3390 mlen = HMAC_size(&hctx);
0eab41fb
BL		 3391 if (mlen < 0)
3392 {
3393 EVP_CIPHER_CTX_cleanup(&ctx);
3394 return -1;
3395 }
6434abbf 3396 eticklen -= mlen;
6434abbf 3397 /* Check HMAC of encrypted ticket */
6434abbf
DSH		 3398 HMAC_Update(&hctx, etick, eticklen);
3399 HMAC_Final(&hctx, tick_hmac, NULL);
3400 HMAC_CTX_cleanup(&hctx);
7c770d57 3401 if (CRYPTO_memcmp(tick_hmac, etick + eticklen, mlen))
74827055
DSH		 3402 {
3403 EVP_CIPHER_CTX_cleanup(&ctx);
c519e89f 3404 return 2;
74827055 3405 }
6434abbf 3406 /* Attempt to decrypt session data */
6434abbf 3407 /* Move p after IV to start of encrypted ticket, update length */
8a2062fe
DSH		 3408 p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
3409 eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
6434abbf
DSH		 3410 sdec = OPENSSL_malloc(eticklen);
3411 if (!sdec)
3412 {
3413 EVP_CIPHER_CTX_cleanup(&ctx);
3414 return -1;
3415 }
3416 EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
3417 if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
44724bee
DSH		 3418 {
3419 EVP_CIPHER_CTX_cleanup(&ctx);
3420 OPENSSL_free(sdec);
c519e89f 3421 return 2;
44724bee 3422 }
6434abbf
DSH		 3423 slen += mlen;
3424 EVP_CIPHER_CTX_cleanup(&ctx);
3425 p = sdec;
c519e89f 3426
6434abbf
DSH		 3427 sess = d2i_SSL_SESSION(NULL, &p, slen);
3428 OPENSSL_free(sdec);
3429 if (sess)
3430 {
c519e89f
BM		 3431 /* The session ID, if non-empty, is used by some clients to
3432 * detect that the ticket has been accepted. So we copy it to
3433 * the session structure. If it is empty set length to zero
3434 * as required by standard.
3435 */
6434abbf
DSH		 3436 if (sesslen)
3437 memcpy(sess->session_id, sess_id, sesslen);
3438 sess->session_id_length = sesslen;
3439 *psess = sess;
c519e89f
BM		 3440 if (renew_ticket)
3441 return 4;
3442 else
3443 return 3;
6434abbf 3444 }
c519e89f
BM		 3445 ERR_clear_error();
3446 /* For session parse failure, indicate that we need to send a new
3447 * ticket. */
3448 return 2;
6434abbf 3449 }
6434abbf 3450
6b7be581
DSH		 3451/* Tables to translate from NIDs to TLS v1.2 ids */
3452
3453typedef struct
3454 {
3455 int nid;
3456 int id;
3457 } tls12_lookup;
3458
3459static tls12_lookup tls12_md[] = {
6b7be581 3460 {NID_md5, TLSEXT_hash_md5},
6b7be581 3461 {NID_sha1, TLSEXT_hash_sha1},
6b7be581
DSH		 3462 {NID_sha224, TLSEXT_hash_sha224},
3463 {NID_sha256, TLSEXT_hash_sha256},
6b7be581
DSH		 3464 {NID_sha384, TLSEXT_hash_sha384},
3465 {NID_sha512, TLSEXT_hash_sha512}
6b7be581
DSH		 3466};
3467
3468static tls12_lookup tls12_sig[] = {
6b7be581 3469 {EVP_PKEY_RSA, TLSEXT_signature_rsa},
6b7be581 3470 {EVP_PKEY_DSA, TLSEXT_signature_dsa},
6b7be581 3471 {EVP_PKEY_EC, TLSEXT_signature_ecdsa}
6b7be581
DSH		 3472};
3473
3474static int tls12_find_id(int nid, tls12_lookup *table, size_t tlen)
3475 {
3476 size_t i;
3477 for (i = 0; i < tlen; i++)
3478 {
3479 if (table[i].nid == nid)
3480 return table[i].id;
3481 }
3482 return -1;
3483 }
e7f8ff43 3484
6b7be581
DSH		 3485static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
3486 {
3487 size_t i;
3488 for (i = 0; i < tlen; i++)
3489 {
e7f8ff43 3490 if ((table[i].id) == id)
6b7be581
DSH		 3491 return table[i].nid;
3492 }
e7f8ff43 3493 return NID_undef;
6b7be581 3494 }
a2f9200f
DSH		 3495
3496int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
6b7be581
DSH		 3497 {
3498 int sig_id, md_id;
1db5f356
DSH		 3499 if (!md)
3500 return 0;
6b7be581
DSH		 3501 md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
3502 sizeof(tls12_md)/sizeof(tls12_lookup));
3503 if (md_id == -1)
3504 return 0;
a2f9200f 3505 sig_id = tls12_get_sigid(pk);
6b7be581
DSH		 3506 if (sig_id == -1)
3507 return 0;
3508 p[0] = (unsigned char)md_id;
3509 p[1] = (unsigned char)sig_id;
3510 return 1;
3511 }
3512
a2f9200f
DSH		 3513int tls12_get_sigid(const EVP_PKEY *pk)
3514 {
3515 return tls12_find_id(pk->type, tls12_sig,
3516 sizeof(tls12_sig)/sizeof(tls12_lookup));
3517 }
3518
b362ccab 3519typedef struct
a2f9200f 3520 {
b362ccab
DSH		 3521 int nid;
3522 int secbits;
3523 const EVP_MD *(*mfunc)(void);
3524 } tls12_hash_info;
3525
3526static const tls12_hash_info tls12_md_info[] = {
3527#ifdef OPENSSL_NO_MD5
3528 {NID_md5, 64, 0},
3529#else
3530 {NID_md5, 64, EVP_md5},
ebc5e72f 3531#endif
b362ccab
DSH		 3532#ifdef OPENSSL_NO_SHA
3533 {NID_sha1, 80, 0},
3534#else
3535 {NID_sha1, 80, EVP_sha1},
a2f9200f 3536#endif
b362ccab
DSH		 3537#ifdef OPENSSL_NO_SHA256
3538 {NID_sha224, 112, 0},
3539 {NID_sha256, 128, 0},
3540#else
3541 {NID_sha224, 112, EVP_sha224},
3542 {NID_sha256, 128, EVP_sha256},
a2f9200f 3543#endif
b362ccab
DSH		 3544#ifdef OPENSSL_NO_SHA512
3545 {NID_sha384, 192, 0},
3546 {NID_sha512, 256, 0}
3547#else
3548 {NID_sha384, 192, EVP_sha384},
3549 {NID_sha512, 256, EVP_sha512}
a2f9200f 3550#endif
b362ccab 3551};
a2f9200f 3552
b362ccab
DSH		 3553static const tls12_hash_info *tls12_get_hash_info(unsigned char hash_alg)
3554 {
3555 if (hash_alg == 0)
3556 return NULL;
3557 if (hash_alg > sizeof(tls12_md_info)/sizeof(tls12_md_info[0]))
a2f9200f 3558 return NULL;
b362ccab
DSH		 3559 return tls12_md_info + hash_alg - 1;
3560 }
a2f9200f 3561
b362ccab
DSH		 3562const EVP_MD *tls12_get_hash(unsigned char hash_alg)
3563 {
3564 const tls12_hash_info *inf;
3565#ifndef OPENSSL_FIPS
3566 if (hash_alg == TLSEXT_hash_md5 && FIPS_mode())
3567 return NULL;
3568#endif
3569 inf = tls12_get_hash_info(hash_alg);
3570 if (!inf || !inf->mfunc)
3571 return NULL;
3572 return inf->mfunc();
a2f9200f
DSH		 3573 }
3574
4453cd8c
DSH		 3575static int tls12_get_pkey_idx(unsigned char sig_alg)
3576 {
3577 switch(sig_alg)
3578 {
3579#ifndef OPENSSL_NO_RSA
3580 case TLSEXT_signature_rsa:
3581 return SSL_PKEY_RSA_SIGN;
3582#endif
3583#ifndef OPENSSL_NO_DSA
3584 case TLSEXT_signature_dsa:
3585 return SSL_PKEY_DSA_SIGN;
3586#endif
3587#ifndef OPENSSL_NO_ECDSA
3588 case TLSEXT_signature_ecdsa:
3589 return SSL_PKEY_ECC;
3590#endif
3591 }
3592 return -1;
3593 }
3594
3595/* Convert TLS 1.2 signature algorithm extension values into NIDs */
3596static void tls1_lookup_sigalg(int *phash_nid, int *psign_nid,
3597 int *psignhash_nid, const unsigned char *data)
3598 {
8e2a06bf 3599 int sign_nid = 0, hash_nid = 0;
4453cd8c
DSH		 3600 if (!phash_nid && !psign_nid && !psignhash_nid)
3601 return;
3602 if (phash_nid || psignhash_nid)
3603 {
3604 hash_nid = tls12_find_nid(data[0], tls12_md,
3605 sizeof(tls12_md)/sizeof(tls12_lookup));
3606 if (phash_nid)
3607 *phash_nid = hash_nid;
3608 }
3609 if (psign_nid || psignhash_nid)
3610 {
3611 sign_nid = tls12_find_nid(data[1], tls12_sig,
3612 sizeof(tls12_sig)/sizeof(tls12_lookup));
3613 if (psign_nid)
3614 *psign_nid = sign_nid;
3615 }
3616 if (psignhash_nid)
3617 {
3618 if (sign_nid && hash_nid)
3619 OBJ_find_sigid_by_algs(psignhash_nid,
3620 hash_nid, sign_nid);
3621 else
3622 *psignhash_nid = NID_undef;
3623 }
3624 }
b362ccab
DSH		 3625/* Check to see if a signature algorithm is allowed */
3626static int tls12_sigalg_allowed(SSL *s, int op, const unsigned char *ptmp)
3627 {
3628 /* See if we have an entry in the hash table and it is enabled */
3629 const tls12_hash_info *hinf = tls12_get_hash_info(ptmp[0]);
3630 if (!hinf || !hinf->mfunc)
3631 return 0;
3632 /* See if public key algorithm allowed */
3633 if (tls12_get_pkey_idx(ptmp[1]) == -1)
3634 return 0;
3635 /* Finally see if security callback allows it */
3636 return ssl_security(s, op, hinf->secbits, hinf->nid, (void *)ptmp);
3637 }
3638
3639/* Get a mask of disabled public key algorithms based on supported
3640 * signature algorithms. For example if no signature algorithm supports RSA
3641 * then RSA is disabled.
3642 */
3643
3644void ssl_set_sig_mask(unsigned long *pmask_a, SSL *s, int op)
3645 {
3646 const unsigned char *sigalgs;
3647 size_t i, sigalgslen;
3648 int have_rsa = 0, have_dsa = 0, have_ecdsa = 0;
3649 /* Now go through all signature algorithms seeing if we support
3650 * any for RSA, DSA, ECDSA. Do this for all versions not just
3651 * TLS 1.2. To keep down calls to security callback only check
3652 * if we have to.
3653 */
3654 sigalgslen = tls12_get_psigalgs(s, &sigalgs);
3655 for (i = 0; i < sigalgslen; i += 2, sigalgs += 2)
3656 {
3657 switch(sigalgs[1])
3658 {
3659#ifndef OPENSSL_NO_RSA
3660 case TLSEXT_signature_rsa:
3661 if (!have_rsa && tls12_sigalg_allowed(s, op, sigalgs))
3662 have_rsa = 1;
3663 break;
3664#endif
3665#ifndef OPENSSL_NO_DSA
3666 case TLSEXT_signature_dsa:
3667 if (!have_dsa && tls12_sigalg_allowed(s, op, sigalgs))
3668 have_dsa = 1;
3669 break;
3670#endif
3671#ifndef OPENSSL_NO_ECDSA
3672 case TLSEXT_signature_ecdsa:
3673 if (!have_ecdsa && tls12_sigalg_allowed(s, op, sigalgs))
3674 have_ecdsa = 1;
3675 break;
3676#endif
3677 }
3678 }
3679 if (!have_rsa)
3680 *pmask_a |= SSL_aRSA;
3681 if (!have_dsa)
3682 *pmask_a |= SSL_aDSS;
3683 if (!have_ecdsa)
3684 *pmask_a |= SSL_aECDSA;
3685 }
3686
3687size_t tls12_copy_sigalgs(SSL *s, unsigned char *out,
3688 const unsigned char *psig, size_t psiglen)
3689 {
3690 unsigned char *tmpout = out;
3691 size_t i;
3692 for (i = 0; i < psiglen; i += 2, psig += 2)
3693 {
3694 if (tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SUPPORTED, psig))
3695 {
3696 *tmpout++ = psig[0];
3697 *tmpout++ = psig[1];
3698 }
3699 }
3700 return tmpout - out;
3701 }
3702
4453cd8c 3703/* Given preference and allowed sigalgs set shared sigalgs */
b362ccab 3704static int tls12_shared_sigalgs(SSL *s, TLS_SIGALGS *shsig,
4453cd8c
DSH		 3705 const unsigned char *pref, size_t preflen,
3706 const unsigned char *allow, size_t allowlen)
3707 {
3708 const unsigned char *ptmp, *atmp;
3709 size_t i, j, nmatch = 0;
3710 for (i = 0, ptmp = pref; i < preflen; i+=2, ptmp+=2)
3711 {
3712 /* Skip disabled hashes or signature algorithms */
b362ccab 3713 if (!tls12_sigalg_allowed(s, SSL_SECOP_SIGALG_SHARED, ptmp))
4453cd8c
DSH		 3714 continue;
3715 for (j = 0, atmp = allow; j < allowlen; j+=2, atmp+=2)
3716 {
3717 if (ptmp[0] == atmp[0] && ptmp[1] == atmp[1])
3718 {
3719 nmatch++;
3720 if (shsig)
3721 {
3722 shsig->rhash = ptmp[0];
3723 shsig->rsign = ptmp[1];
3724 tls1_lookup_sigalg(&shsig->hash_nid,
3725 &shsig->sign_nid,
3726 &shsig->signandhash_nid,
3727 ptmp);
3728 shsig++;
3729 }
3730 break;
3731 }
3732 }
3733 }
3734 return nmatch;
3735 }
3736
3737/* Set shared signature algorithms for SSL structures */
3738static int tls1_set_shared_sigalgs(SSL *s)
3739 {
3740 const unsigned char *pref, *allow, *conf;
3741 size_t preflen, allowlen, conflen;
3742 size_t nmatch;
3743 TLS_SIGALGS *salgs = NULL;
3744 CERT *c = s->cert;
2ea80354 3745 unsigned int is_suiteb = tls1_suiteb(s);
4563da1d
DSH		 3746 if (c->shared_sigalgs)
3747 {
3748 OPENSSL_free(c->shared_sigalgs);
3749 c->shared_sigalgs = NULL;
3750 }
3dbc46df 3751 /* If client use client signature algorithms if not NULL */
2ea80354 3752 if (!s->server && c->client_sigalgs && !is_suiteb)
3dbc46df
DSH		 3753 {
3754 conf = c->client_sigalgs;
3755 conflen = c->client_sigalgslen;
3756 }
2ea80354 3757 else if (c->conf_sigalgs && !is_suiteb)
3dbc46df
DSH		 3758 {
3759 conf = c->conf_sigalgs;
4453cd8c 3760 conflen = c->conf_sigalgslen;
3dbc46df 3761 }
4453cd8c 3762 else
2ea80354
DSH		 3763 conflen = tls12_get_psigalgs(s, &conf);
3764 if(s->options & SSL_OP_CIPHER_SERVER_PREFERENCE || is_suiteb)
4453cd8c
DSH		 3765 {
3766 pref = conf;
3767 preflen = conflen;
3768 allow = c->peer_sigalgs;
3769 allowlen = c->peer_sigalgslen;
3770 }
3771 else
3772 {
3773 allow = conf;
3774 allowlen = conflen;
3775 pref = c->peer_sigalgs;
3776 preflen = c->peer_sigalgslen;
3777 }
b362ccab 3778 nmatch = tls12_shared_sigalgs(s, NULL, pref, preflen, allow, allowlen);
4453cd8c
DSH		 3779 if (!nmatch)
3780 return 1;
3781 salgs = OPENSSL_malloc(nmatch * sizeof(TLS_SIGALGS));
3782 if (!salgs)
3783 return 0;
b362ccab 3784 nmatch = tls12_shared_sigalgs(s, salgs, pref, preflen, allow, allowlen);
4453cd8c
DSH		 3785 c->shared_sigalgs = salgs;
3786 c->shared_sigalgslen = nmatch;
3787 return 1;
3788 }
3789
3790
6b7be581
DSH		 3791/* Set preferred digest for each key type */
3792
c800c27a 3793int tls1_save_sigalgs(SSL *s, const unsigned char *data, int dsize)
6b7be581 3794 {
6b7be581 3795 CERT *c = s->cert;
cbd64894
DSH		 3796 /* Extension ignored for inappropriate versions */
3797 if (!SSL_USE_SIGALGS(s))
6b7be581 3798 return 1;
8f829124
DSH		 3799 /* Should never happen */
3800 if (!c)
3801 return 0;
6b7be581 3802
4563da1d
DSH		 3803 if (c->peer_sigalgs)
3804 OPENSSL_free(c->peer_sigalgs);
4453cd8c 3805 c->peer_sigalgs = OPENSSL_malloc(dsize);
0f229cce 3806 if (!c->peer_sigalgs)
e7f8ff43 3807 return 0;
4453cd8c
DSH		 3808 c->peer_sigalgslen = dsize;
3809 memcpy(c->peer_sigalgs, data, dsize);
c800c27a
DSH		 3810 return 1;
3811 }
6b7be581 3812
c800c27a
DSH		 3813int tls1_process_sigalgs(SSL *s)
3814 {
3815 int idx;
3816 size_t i;
3817 const EVP_MD *md;
3818 CERT *c = s->cert;
3819 TLS_SIGALGS *sigptr;
3820 if (!tls1_set_shared_sigalgs(s))
3821 return 0;
6b7be581 3822
ed83ba53 3823#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
ddd13d67 3824 if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
ed83ba53
DSH		 3825 {
3826 /* Use first set signature preference to force message
3827 * digest, ignoring any peer preferences.
3828 */
3829 const unsigned char *sigs = NULL;
3830 if (s->server)
3831 sigs = c->conf_sigalgs;
3832 else
3833 sigs = c->client_sigalgs;
3834 if (sigs)
3835 {
3836 idx = tls12_get_pkey_idx(sigs[1]);
3837 md = tls12_get_hash(sigs[0]);
3838 c->pkeys[idx].digest = md;
3839 c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3840 if (idx == SSL_PKEY_RSA_SIGN)
3841 {
3842 c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
3843 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
3844 }
3845 }
3846 }
3847#endif
3848
4453cd8c
DSH		 3849 for (i = 0, sigptr = c->shared_sigalgs;
3850 i < c->shared_sigalgslen; i++, sigptr++)
3851 {
3852 idx = tls12_get_pkey_idx(sigptr->rsign);
3853 if (idx > 0 && c->pkeys[idx].digest == NULL)
6b7be581 3854 {
e7f8ff43 3855 md = tls12_get_hash(sigptr->rhash);
4453cd8c 3856 c->pkeys[idx].digest = md;
6dbb6219 3857 c->pkeys[idx].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
4453cd8c 3858 if (idx == SSL_PKEY_RSA_SIGN)
6dbb6219
DSH		 3859 {
3860 c->pkeys[SSL_PKEY_RSA_ENC].valid_flags = CERT_PKEY_EXPLICIT_SIGN;
4453cd8c 3861 c->pkeys[SSL_PKEY_RSA_ENC].digest = md;
6dbb6219 3862 }
6b7be581
DSH		 3863 }
3864
6b7be581 3865 }
d61ff83b
DSH		 3866 /* In strict mode leave unset digests as NULL to indicate we can't
3867 * use the certificate for signing.
6b7be581 3868 */
2ea80354 3869 if (!(s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT))
d61ff83b
DSH		 3870 {
3871 /* Set any remaining keys to default values. NOTE: if alg is
3872 * not supported it stays as NULL.
3873 */
6b7be581 3874#ifndef OPENSSL_NO_DSA
d61ff83b
DSH		 3875 if (!c->pkeys[SSL_PKEY_DSA_SIGN].digest)
3876 c->pkeys[SSL_PKEY_DSA_SIGN].digest = EVP_sha1();
6b7be581
DSH		 3877#endif
3878#ifndef OPENSSL_NO_RSA
d61ff83b
DSH		 3879 if (!c->pkeys[SSL_PKEY_RSA_SIGN].digest)
3880 {
3881 c->pkeys[SSL_PKEY_RSA_SIGN].digest = EVP_sha1();
3882 c->pkeys[SSL_PKEY_RSA_ENC].digest = EVP_sha1();
3883 }
6b7be581
DSH		 3884#endif
3885#ifndef OPENSSL_NO_ECDSA
d61ff83b
DSH		 3886 if (!c->pkeys[SSL_PKEY_ECC].digest)
3887 c->pkeys[SSL_PKEY_ECC].digest = EVP_sha1();
6b7be581 3888#endif
d61ff83b 3889 }
6b7be581
DSH		 3890 return 1;
3891 }
3892
4817504d 3893
e7f8ff43 3894int SSL_get_sigalgs(SSL *s, int idx,
4453cd8c 3895 int *psign, int *phash, int *psignhash,
e7f8ff43
DSH		 3896 unsigned char *rsig, unsigned char *rhash)
3897 {
4453cd8c
DSH		 3898 const unsigned char *psig = s->cert->peer_sigalgs;
3899 if (psig == NULL)
e7f8ff43
DSH		 3900 return 0;
3901 if (idx >= 0)
3902 {
4453cd8c 3903 idx <<= 1;
0f229cce 3904 if (idx >= (int)s->cert->peer_sigalgslen)
e7f8ff43 3905 return 0;
4453cd8c 3906 psig += idx;
e7f8ff43 3907 if (rhash)
4453cd8c
DSH		 3908 *rhash = psig[0];
3909 if (rsig)
3910 *rsig = psig[1];
3911 tls1_lookup_sigalg(phash, psign, psignhash, psig);
e7f8ff43 3912 }
4453cd8c
DSH		 3913 return s->cert->peer_sigalgslen / 2;
3914 }
3915
3916int SSL_get_shared_sigalgs(SSL *s, int idx,
3917 int *psign, int *phash, int *psignhash,
3918 unsigned char *rsig, unsigned char *rhash)
3919 {
3920 TLS_SIGALGS *shsigalgs = s->cert->shared_sigalgs;
3921 if (!shsigalgs || idx >= (int)s->cert->shared_sigalgslen)
3922 return 0;
3923 shsigalgs += idx;
3924 if (phash)
3925 *phash = shsigalgs->hash_nid;
3926 if (psign)
3927 *psign = shsigalgs->sign_nid;
3928 if (psignhash)
3929 *psignhash = shsigalgs->signandhash_nid;
3930 if (rsig)
3931 *rsig = shsigalgs->rsign;
3932 if (rhash)
3933 *rhash = shsigalgs->rhash;
3934 return s->cert->shared_sigalgslen;
e7f8ff43
DSH		 3935 }
3936
3937
4817504d
DSH		 3938#ifndef OPENSSL_NO_HEARTBEATS
3939int
3940tls1_process_heartbeat(SSL *s)
3941 {
3942 unsigned char *p = &s->s3->rrec.data[0], *pl;
3943 unsigned short hbtype;
3944 unsigned int payload;
3945 unsigned int padding = 16; /* Use minimum padding */
3946
4817504d
DSH		 3947 if (s->msg_callback)
3948 s->msg_callback(0, s->version, TLS1_RT_HEARTBEAT,
3949 &s->s3->rrec.data[0], s->s3->rrec.length,
3950 s, s->msg_callback_arg);
3951
731f4314
DSH		 3952 /* Read type and payload length first */
3953 if (1 + 2 + 16 > s->s3->rrec.length)
3954 return 0; /* silently discard */
3955 hbtype = *p++;
3956 n2s(p, payload);
3957 if (1 + 2 + payload + 16 > s->s3->rrec.length)
3958 return 0; /* silently discard per RFC 6520 sec. 4 */
3959 pl = p;
3960
4817504d
DSH		 3961 if (hbtype == TLS1_HB_REQUEST)
3962 {
3963 unsigned char *buffer, *bp;
3964 int r;
3965
3966 /* Allocate memory for the response, size is 1 bytes
3967 * message type, plus 2 bytes payload length, plus
3968 * payload, plus padding
3969 */
3970 buffer = OPENSSL_malloc(1 + 2 + payload + padding);
3971 bp = buffer;
3972
3973 /* Enter response type, length and copy payload */
3974 *bp++ = TLS1_HB_RESPONSE;
3975 s2n(payload, bp);
3976 memcpy(bp, pl, payload);
57cb030c
DSH		 3977 bp += payload;
3978 /* Random padding */
3979 RAND_pseudo_bytes(bp, padding);
3980
4817504d
DSH		 3981 r = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buffer, 3 + payload + padding);
3982
3983 if (r >= 0 && s->msg_callback)
3984 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
3985 buffer, 3 + payload + padding,
3986 s, s->msg_callback_arg);
3987
3988 OPENSSL_free(buffer);
3989
3990 if (r < 0)
3991 return r;
3992 }
3993 else if (hbtype == TLS1_HB_RESPONSE)
3994 {
3995 unsigned int seq;
3996
3997 /* We only send sequence numbers (2 bytes unsigned int),
3998 * and 16 random bytes, so we just try to read the
3999 * sequence number */
4000 n2s(pl, seq);
4001
4002 if (payload == 18 && seq == s->tlsext_hb_seq)
4003 {
4004 s->tlsext_hb_seq++;
4005 s->tlsext_hb_pending = 0;
4006 }
4007 }
4008
4009 return 0;
4010 }
4011
4012int
4013tls1_heartbeat(SSL *s)
4014 {
4015 unsigned char *buf, *p;
4016 int ret;
4017 unsigned int payload = 18; /* Sequence number + random bytes */
4018 unsigned int padding = 16; /* Use minimum padding */
4019
4020 /* Only send if peer supports and accepts HB requests... */
4021 if (!(s->tlsext_heartbeat & SSL_TLSEXT_HB_ENABLED) ||
4022 s->tlsext_heartbeat & SSL_TLSEXT_HB_DONT_SEND_REQUESTS)
4023 {
4024 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PEER_DOESNT_ACCEPT);
4025 return -1;
4026 }
4027
4028 /* ...and there is none in flight yet... */
4029 if (s->tlsext_hb_pending)
4030 {
4031 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_TLS_HEARTBEAT_PENDING);
4032 return -1;
4033 }
4034
4035 /* ...and no handshake in progress. */
4036 if (SSL_in_init(s) || s->in_handshake)
4037 {
4038 SSLerr(SSL_F_TLS1_HEARTBEAT,SSL_R_UNEXPECTED_MESSAGE);
4039 return -1;
4040 }
4041
4042 /* Check if padding is too long, payload and padding
4043 * must not exceed 2^14 - 3 = 16381 bytes in total.
4044 */
4045 OPENSSL_assert(payload + padding <= 16381);
4046
4047 /* Create HeartBeat message, we just use a sequence number
4048 * as payload to distuingish different messages and add
4049 * some random stuff.
4050 * - Message Type, 1 byte
4051 * - Payload Length, 2 bytes (unsigned int)
4052 * - Payload, the sequence number (2 bytes uint)
4053 * - Payload, random bytes (16 bytes uint)
4054 * - Padding
4055 */
4056 buf = OPENSSL_malloc(1 + 2 + payload + padding);
4057 p = buf;
4058 /* Message Type */
4059 *p++ = TLS1_HB_REQUEST;
4060 /* Payload length (18 bytes here) */
4061 s2n(payload, p);
4062 /* Sequence number */
4063 s2n(s->tlsext_hb_seq, p);
4064 /* 16 random bytes */
4065 RAND_pseudo_bytes(p, 16);
4066 p += 16;
4067 /* Random padding */
4068 RAND_pseudo_bytes(p, padding);
4069
4070 ret = ssl3_write_bytes(s, TLS1_RT_HEARTBEAT, buf, 3 + payload + padding);
4071 if (ret >= 0)
4072 {
4073 if (s->msg_callback)
4074 s->msg_callback(1, s->version, TLS1_RT_HEARTBEAT,
4075 buf, 3 + payload + padding,
4076 s, s->msg_callback_arg);
4077
4078 s->tlsext_hb_pending = 1;
4079 }
4080
4081 OPENSSL_free(buf);
4082
4083 return ret;
4084 }
4085#endif
0f229cce 4086
4453cd8c 4087#define MAX_SIGALGLEN (TLSEXT_hash_num * TLSEXT_signature_num * 2)
0f229cce
DSH		 4088
4089typedef struct
4090 {
4091 size_t sigalgcnt;
4092 int sigalgs[MAX_SIGALGLEN];
4093 } sig_cb_st;
4094
4095static int sig_cb(const char *elem, int len, void *arg)
4096 {
4097 sig_cb_st *sarg = arg;
4098 size_t i;
4099 char etmp[20], *p;
4100 int sig_alg, hash_alg;
4101 if (sarg->sigalgcnt == MAX_SIGALGLEN)
4102 return 0;
4103 if (len > (int)(sizeof(etmp) - 1))
4104 return 0;
4105 memcpy(etmp, elem, len);
4106 etmp[len] = 0;
4107 p = strchr(etmp, '+');
4108 if (!p)
4109 return 0;
4110 *p = 0;
4111 p++;
4112 if (!*p)
4113 return 0;
4114
4115 if (!strcmp(etmp, "RSA"))
4116 sig_alg = EVP_PKEY_RSA;
4117 else if (!strcmp(etmp, "DSA"))
4118 sig_alg = EVP_PKEY_DSA;
4119 else if (!strcmp(etmp, "ECDSA"))
4120 sig_alg = EVP_PKEY_EC;
4121 else return 0;
4122
4123 hash_alg = OBJ_sn2nid(p);
4124 if (hash_alg == NID_undef)
4125 hash_alg = OBJ_ln2nid(p);
4126 if (hash_alg == NID_undef)
4127 return 0;
4128
4129 for (i = 0; i < sarg->sigalgcnt; i+=2)
4130 {
4131 if (sarg->sigalgs[i] == sig_alg
4132 && sarg->sigalgs[i + 1] == hash_alg)
4133 return 0;
4134 }
4135 sarg->sigalgs[sarg->sigalgcnt++] = hash_alg;
4136 sarg->sigalgs[sarg->sigalgcnt++] = sig_alg;
4137 return 1;
4138 }
4139
4140/* Set suppored signature algorithms based on a colon separated list
4141 * of the form sig+hash e.g. RSA+SHA512:DSA+SHA512 */
3dbc46df 4142int tls1_set_sigalgs_list(CERT *c, const char *str, int client)
0f229cce
DSH		 4143 {
4144 sig_cb_st sig;
4145 sig.sigalgcnt = 0;
4146 if (!CONF_parse_list(str, ':', 1, sig_cb, &sig))
4147 return 0;
8bb870df
DSH		 4148 if (c == NULL)
4149 return 1;
3dbc46df 4150 return tls1_set_sigalgs(c, sig.sigalgs, sig.sigalgcnt, client);
0f229cce
DSH		 4151 }
4152
3dbc46df 4153int tls1_set_sigalgs(CERT *c, const int *psig_nids, size_t salglen, int client)
0f229cce 4154 {
4453cd8c 4155 unsigned char *sigalgs, *sptr;
0f229cce
DSH		 4156 int rhash, rsign;
4157 size_t i;
4158 if (salglen & 1)
4159 return 0;
4453cd8c 4160 sigalgs = OPENSSL_malloc(salglen);
0f229cce
DSH		 4161 if (sigalgs == NULL)
4162 return 0;
4453cd8c 4163 for (i = 0, sptr = sigalgs; i < salglen; i+=2)
0f229cce 4164 {
4453cd8c 4165 rhash = tls12_find_id(*psig_nids++, tls12_md,
0f229cce 4166 sizeof(tls12_md)/sizeof(tls12_lookup));
4453cd8c 4167 rsign = tls12_find_id(*psig_nids++, tls12_sig,
0f229cce
DSH		 4168 sizeof(tls12_sig)/sizeof(tls12_lookup));
4169
4170 if (rhash == -1 || rsign == -1)
4171 goto err;
4453cd8c
DSH		 4172 *sptr++ = rhash;
4173 *sptr++ = rsign;
0f229cce
DSH		 4174 }
4175
3dbc46df
DSH		 4176 if (client)
4177 {
4178 if (c->client_sigalgs)
4179 OPENSSL_free(c->client_sigalgs);
4180 c->client_sigalgs = sigalgs;
4181 c->client_sigalgslen = salglen;
4182 }
4183 else
4184 {
4185 if (c->conf_sigalgs)
4186 OPENSSL_free(c->conf_sigalgs);
4187 c->conf_sigalgs = sigalgs;
4188 c->conf_sigalgslen = salglen;
4189 }
0f229cce 4190
0f229cce
DSH		 4191 return 1;
4192
4193 err:
4194 OPENSSL_free(sigalgs);
4195 return 0;
4196 }
4453cd8c 4197
d61ff83b
DSH		 4198static int tls1_check_sig_alg(CERT *c, X509 *x, int default_nid)
4199 {
4200 int sig_nid;
4201 size_t i;
4202 if (default_nid == -1)
4203 return 1;
4204 sig_nid = X509_get_signature_nid(x);
4205 if (default_nid)
4206 return sig_nid == default_nid ? 1 : 0;
4207 for (i = 0; i < c->shared_sigalgslen; i++)
4208 if (sig_nid == c->shared_sigalgs[i].signandhash_nid)
4209 return 1;
4210 return 0;
4211 }
6dbb6219
DSH		 4212/* Check to see if a certificate issuer name matches list of CA names */
4213static int ssl_check_ca_name(STACK_OF(X509_NAME) *names, X509 *x)
4214 {
4215 X509_NAME *nm;
4216 int i;
4217 nm = X509_get_issuer_name(x);
4218 for (i = 0; i < sk_X509_NAME_num(names); i++)
4219 {
4220 if(!X509_NAME_cmp(nm, sk_X509_NAME_value(names, i)))
4221 return 1;
4222 }
4223 return 0;
4224 }
d61ff83b
DSH		 4225
4226/* Check certificate chain is consistent with TLS extensions and is
6dbb6219
DSH		 4227 * usable by server. This servers two purposes: it allows users to
4228 * check chains before passing them to the server and it allows the
4229 * server to check chains before attempting to use them.
d61ff83b 4230 */
6dbb6219
DSH		 4231
4232/* Flags which need to be set for a certificate when stict mode not set */
4233
4234#define CERT_PKEY_VALID_FLAGS \
4235 (CERT_PKEY_EE_SIGNATURE|CERT_PKEY_EE_PARAM)
4236/* Strict mode flags */
4237#define CERT_PKEY_STRICT_FLAGS \
4238 (CERT_PKEY_VALID_FLAGS|CERT_PKEY_CA_SIGNATURE|CERT_PKEY_CA_PARAM \
4239 | CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE)
4240
d61ff83b
DSH		 4241int tls1_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain,
4242 int idx)
4243 {
4244 int i;
6dbb6219
DSH		 4245 int rv = 0;
4246 int check_flags = 0, strict_mode;
d61ff83b
DSH		 4247 CERT_PKEY *cpk = NULL;
4248 CERT *c = s->cert;
2ea80354
DSH		 4249 unsigned int suiteb_flags = tls1_suiteb(s);
4250 /* idx == -1 means checking server chains */
d61ff83b
DSH		 4251 if (idx != -1)
4252 {
2ea80354
DSH		 4253 /* idx == -2 means checking client certificate chains */
4254 if (idx == -2)
4255 {
4256 cpk = c->key;
4257 idx = cpk - c->pkeys;
4258 }
4259 else
4260 cpk = c->pkeys + idx;
d61ff83b
DSH		 4261 x = cpk->x509;
4262 pk = cpk->privatekey;
4263 chain = cpk->chain;
2ea80354 4264 strict_mode = c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT;
d61ff83b
DSH		 4265 /* If no cert or key, forget it */
4266 if (!x || !pk)
4267 goto end;
ed83ba53
DSH		 4268#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
4269 /* Allow any certificate to pass test */
ddd13d67 4270 if (s->cert->cert_flags & SSL_CERT_FLAG_BROKEN_PROTOCOL)
ed83ba53
DSH		 4271 {
4272 rv = CERT_PKEY_STRICT_FLAGS|CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_VALID|CERT_PKEY_SIGN;
4273 cpk->valid_flags = rv;
4274 return rv;
4275 }
4276#endif
d61ff83b
DSH		 4277 }
4278 else
4279 {
6dbb6219
DSH		 4280 if (!x || !pk)
4281 goto end;
d61ff83b
DSH		 4282 idx = ssl_cert_type(x, pk);
4283 if (idx == -1)
4284 goto end;
6dbb6219 4285 cpk = c->pkeys + idx;
2ea80354 4286 if (c->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT)
6dbb6219
DSH		 4287 check_flags = CERT_PKEY_STRICT_FLAGS;
4288 else
4289 check_flags = CERT_PKEY_VALID_FLAGS;
4290 strict_mode = 1;
d61ff83b
DSH		 4291 }
4292
2ea80354
DSH		 4293 if (suiteb_flags)
4294 {
4295 int ok;
4296 if (check_flags)
4297 check_flags |= CERT_PKEY_SUITEB;
4298 ok = X509_chain_check_suiteb(NULL, x, chain, suiteb_flags);
7255ca99
DSH		 4299 if (ok == X509_V_OK)
4300 rv |= CERT_PKEY_SUITEB;
4301 else if (!check_flags)
4302 goto end;
2ea80354 4303 }
6dbb6219 4304
d61ff83b
DSH		 4305 /* Check all signature algorithms are consistent with
4306 * signature algorithms extension if TLS 1.2 or later
4307 * and strict mode.
4308 */
6dbb6219 4309 if (TLS1_get_version(s) >= TLS1_2_VERSION && strict_mode)
d61ff83b
DSH		 4310 {
4311 int default_nid;
4312 unsigned char rsign = 0;
4313 if (c->peer_sigalgs)
4314 default_nid = 0;
4315 /* If no sigalgs extension use defaults from RFC5246 */
4316 else
4317 {
4318 switch(idx)
4319 {
4320 case SSL_PKEY_RSA_ENC:
4321 case SSL_PKEY_RSA_SIGN:
4322 case SSL_PKEY_DH_RSA:
4323 rsign = TLSEXT_signature_rsa;
4324 default_nid = NID_sha1WithRSAEncryption;
4325 break;
4326
4327 case SSL_PKEY_DSA_SIGN:
4328 case SSL_PKEY_DH_DSA:
4329 rsign = TLSEXT_signature_dsa;
4330 default_nid = NID_dsaWithSHA1;
4331 break;
4332
4333 case SSL_PKEY_ECC:
4334 rsign = TLSEXT_signature_ecdsa;
4335 default_nid = NID_ecdsa_with_SHA1;
4336 break;
4337
4338 default:
4339 default_nid = -1;
4340 break;
4341 }
4342 }
4343 /* If peer sent no signature algorithms extension and we
4344 * have set preferred signature algorithms check we support
4345 * sha1.
4346 */
15a70fe5 4347 if (default_nid > 0 && c->conf_sigalgs)
d61ff83b
DSH		 4348 {
4349 size_t j;
4350 const unsigned char *p = c->conf_sigalgs;
4351 for (j = 0; j < c->conf_sigalgslen; j += 2, p += 2)
4352 {
4353 if (p[0] == TLSEXT_hash_sha1 && p[1] == rsign)
4354 break;
4355 }
4356 if (j == c->conf_sigalgslen)
6dbb6219
DSH		 4357 {
4358 if (check_flags)
4359 goto skip_sigs;
4360 else
4361 goto end;
4362 }
d61ff83b
DSH		 4363 }
4364 /* Check signature algorithm of each cert in chain */
4365 if (!tls1_check_sig_alg(c, x, default_nid))
6dbb6219
DSH		 4366 {
4367 if (!check_flags) goto end;
4368 }
4369 else
4370 rv |= CERT_PKEY_EE_SIGNATURE;
4371 rv |= CERT_PKEY_CA_SIGNATURE;
d61ff83b
DSH		 4372 for (i = 0; i < sk_X509_num(chain); i++)
4373 {
4374 if (!tls1_check_sig_alg(c, sk_X509_value(chain, i),
4375 default_nid))
6dbb6219
DSH		 4376 {
4377 if (check_flags)
4378 {
4379 rv &= ~CERT_PKEY_CA_SIGNATURE;
4380 break;
4381 }
4382 else
4383 goto end;
4384 }
d61ff83b
DSH		 4385 }
4386 }
6dbb6219
DSH		 4387 /* Else not TLS 1.2, so mark EE and CA signing algorithms OK */
4388 else if(check_flags)
4389 rv |= CERT_PKEY_EE_SIGNATURE|CERT_PKEY_CA_SIGNATURE;
4390 skip_sigs:
2ea80354
DSH		 4391 /* Check cert parameters are consistent */
4392 if (tls1_check_cert_param(s, x, check_flags ? 1 : 2))
6dbb6219
DSH		 4393 rv |= CERT_PKEY_EE_PARAM;
4394 else if (!check_flags)
d61ff83b 4395 goto end;
6dbb6219
DSH		 4396 if (!s->server)
4397 rv |= CERT_PKEY_CA_PARAM;
d61ff83b 4398 /* In strict mode check rest of chain too */
6dbb6219 4399 else if (strict_mode)
d61ff83b 4400 {
6dbb6219 4401 rv |= CERT_PKEY_CA_PARAM;
d61ff83b
DSH		 4402 for (i = 0; i < sk_X509_num(chain); i++)
4403 {
2ea80354
DSH		 4404 X509 *ca = sk_X509_value(chain, i);
4405 if (!tls1_check_cert_param(s, ca, 0))
6dbb6219
DSH		 4406 {
4407 if (check_flags)
4408 {
4409 rv &= ~CERT_PKEY_CA_PARAM;
4410 break;
4411 }
4412 else
4413 goto end;
4414 }
4415 }
4416 }
4417 if (!s->server && strict_mode)
4418 {
4419 STACK_OF(X509_NAME) *ca_dn;
4420 int check_type = 0;
4421 switch (pk->type)
4422 {
4423 case EVP_PKEY_RSA:
4424 check_type = TLS_CT_RSA_SIGN;
4425 break;
4426 case EVP_PKEY_DSA:
4427 check_type = TLS_CT_DSS_SIGN;
4428 break;
4429 case EVP_PKEY_EC:
4430 check_type = TLS_CT_ECDSA_SIGN;
4431 break;
4432 case EVP_PKEY_DH:
4433 case EVP_PKEY_DHX:
4434 {
4435 int cert_type = X509_certificate_type(x, pk);
4436 if (cert_type & EVP_PKS_RSA)
4437 check_type = TLS_CT_RSA_FIXED_DH;
4438 if (cert_type & EVP_PKS_DSA)
4439 check_type = TLS_CT_DSS_FIXED_DH;
4440 }
4441 }
4442 if (check_type)
4443 {
4444 const unsigned char *ctypes;
4445 int ctypelen;
4446 if (c->ctypes)
4447 {
4448 ctypes = c->ctypes;
4449 ctypelen = (int)c->ctype_num;
4450 }
4451 else
4452 {
4453 ctypes = (unsigned char *)s->s3->tmp.ctype;
4454 ctypelen = s->s3->tmp.ctype_num;
4455 }
4456 for (i = 0; i < ctypelen; i++)
4457 {
4458 if (ctypes[i] == check_type)
4459 {
4460 rv |= CERT_PKEY_CERT_TYPE;
4461 break;
4462 }
4463 }
4464 if (!(rv & CERT_PKEY_CERT_TYPE) && !check_flags)
d61ff83b
DSH		 4465 goto end;
4466 }
6dbb6219
DSH		 4467 else
4468 rv |= CERT_PKEY_CERT_TYPE;
4469
4470
4471 ca_dn = s->s3->tmp.ca_names;
4472
4473 if (!sk_X509_NAME_num(ca_dn))
4474 rv |= CERT_PKEY_ISSUER_NAME;
4475
4476 if (!(rv & CERT_PKEY_ISSUER_NAME))
4477 {
4478 if (ssl_check_ca_name(ca_dn, x))
4479 rv |= CERT_PKEY_ISSUER_NAME;
4480 }
4481 if (!(rv & CERT_PKEY_ISSUER_NAME))
4482 {
4483 for (i = 0; i < sk_X509_num(chain); i++)
4484 {
4485 X509 *xtmp = sk_X509_value(chain, i);
4486 if (ssl_check_ca_name(ca_dn, xtmp))
4487 {
4488 rv |= CERT_PKEY_ISSUER_NAME;
4489 break;
4490 }
4491 }
4492 }
4493 if (!check_flags && !(rv & CERT_PKEY_ISSUER_NAME))
4494 goto end;
d61ff83b 4495 }
6dbb6219
DSH		 4496 else
4497 rv |= CERT_PKEY_ISSUER_NAME|CERT_PKEY_CERT_TYPE;
4498
4499 if (!check_flags || (rv & check_flags) == check_flags)
4500 rv |= CERT_PKEY_VALID;
d61ff83b
DSH		 4501
4502 end:
6dbb6219
DSH		 4503
4504 if (TLS1_get_version(s) >= TLS1_2_VERSION)
d61ff83b 4505 {
6dbb6219
DSH		 4506 if (cpk->valid_flags & CERT_PKEY_EXPLICIT_SIGN)
4507 rv |= CERT_PKEY_EXPLICIT_SIGN|CERT_PKEY_SIGN;
4508 else if (cpk->digest)
d61ff83b 4509 rv |= CERT_PKEY_SIGN;
6dbb6219
DSH		 4510 }
4511 else
4512 rv |= CERT_PKEY_SIGN|CERT_PKEY_EXPLICIT_SIGN;
4513
4514 /* When checking a CERT_PKEY structure all flags are irrelevant
4515 * if the chain is invalid.
4516 */
4517 if (!check_flags)
4518 {
4519 if (rv & CERT_PKEY_VALID)
4520 cpk->valid_flags = rv;
4521 else
2ea80354
DSH		 4522 {
4523 /* Preserve explicit sign flag, clear rest */
4524 cpk->valid_flags &= CERT_PKEY_EXPLICIT_SIGN;
4525 return 0;
4526 }
d61ff83b
DSH		 4527 }
4528 return rv;
4529 }
4530
4531/* Set validity of certificates in an SSL structure */
4532void tls1_set_cert_validity(SSL *s)
4533 {
4534 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_ENC);
4535 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_RSA_SIGN);
4536 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DSA_SIGN);
4537 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_RSA);
4538 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_DH_DSA);
4539 tls1_check_chain(s, NULL, NULL, NULL, SSL_PKEY_ECC);
4540 }
18d71588
DSH		 4541/* User level utiity function to check a chain is suitable */
4542int SSL_check_chain(SSL *s, X509 *x, EVP_PKEY *pk, STACK_OF(X509) *chain)
4543 {
4544 return tls1_check_chain(s, x, pk, chain, -1);
4545 }
d61ff83b 4546
4453cd8c 4547#endif
09599b52
DSH		 4548
4549#ifndef OPENSSL_NO_DH
4550DH *ssl_get_auto_dh(SSL *s)
4551 {
4552 int dh_secbits = 80;
4553 if (s->cert->dh_tmp_auto == 2)
4554 return DH_get_1024_160();
4555 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
4556 {
4557 if (s->s3->tmp.new_cipher->strength_bits == 256)
4558 dh_secbits = 128;
4559 else
4560 dh_secbits = 80;
4561 }
4562 else
4563 {
4564 CERT_PKEY *cpk = ssl_get_server_send_pkey(s);
4565 dh_secbits = EVP_PKEY_security_bits(cpk->privatekey);
4566 }
4567
4568 if (dh_secbits >= 128)
4569 {
4570 DH *dhp = DH_new();
4571 if (!dhp)
4572 return NULL;
4573 dhp->g = BN_new();
4574 if (dhp->g)
4575 BN_set_word(dhp->g, 2);
4576 if (dh_secbits >= 192)
4577 dhp->p = get_rfc3526_prime_8192(NULL);
4578 else
4579 dhp->p = get_rfc3526_prime_3072(NULL);
4580 if (!dhp->p || !dhp->g)
4581 {
4582 DH_free(dhp);
4583 return NULL;
4584 }
4585 return dhp;
4586 }
4587 if (dh_secbits >= 112)
4588 return DH_get_2048_224();
4589 return DH_get_1024_160();
4590 }
4591#endif
b362ccab
DSH		 4592
4593static int ssl_security_cert_key(SSL *s, SSL_CTX *ctx, X509 *x, int op)
4594 {
4595 int secbits;
4596 EVP_PKEY *pkey = X509_get_pubkey(x);
4597 if (pkey)
4598 {
4599 secbits = EVP_PKEY_security_bits(pkey);
4600 EVP_PKEY_free(pkey);
4601 }
4602 else
4603 secbits = -1;
4604 if (s)
4605 return ssl_security(s, op, secbits, 0, x);
4606 else
4607 return ssl_ctx_security(ctx, op, secbits, 0, x);
4608 }
4609
4610static int ssl_security_cert_sig(SSL *s, SSL_CTX *ctx, X509 *x, int op)
4611 {
4612 /* Lookup signature algorithm digest */
4613 int secbits = -1, md_nid = NID_undef, sig_nid;
4614 sig_nid = X509_get_signature_nid(x);
4615 if (sig_nid && OBJ_find_sigid_algs(sig_nid, &md_nid, NULL))
4616 {
4617 const EVP_MD *md;
4618 if (md_nid && (md = EVP_get_digestbynid(md_nid)))
4619 secbits = EVP_MD_size(md) * 4;
4620 }
4621 if (s)
4622 return ssl_security(s, op, secbits, md_nid, x);
4623 else
4624 return ssl_ctx_security(ctx, op, secbits, md_nid, x);
4625 }
4626
4627int ssl_security_cert(SSL *s, SSL_CTX *ctx, X509 *x, int vfy, int is_ee)
4628 {
4629 if (vfy)
4630 vfy = SSL_SECOP_PEER;
4631 if (is_ee)
4632 {
4633 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_EE_KEY | vfy))
4634 return SSL_R_EE_KEY_TOO_SMALL;
4635 }
4636 else
4637 {
4638 if (!ssl_security_cert_key(s, ctx, x, SSL_SECOP_CA_KEY | vfy))
4639 return SSL_R_CA_KEY_TOO_SMALL;
4640 }
4641 if (!ssl_security_cert_sig(s, ctx, x, SSL_SECOP_CA_MD | vfy))
4642 return SSL_R_CA_MD_TOO_WEAK;
4643 return 1;
4644 }
4645
4646/* Check security of a chain, if sk includes the end entity certificate
4647 * then x is NULL. If vfy is 1 then we are verifying a peer chain and
4648 * not sending one to the peer.
4649 * Return values: 1 if ok otherwise error code to use
4650 */
4651
4652int ssl_security_cert_chain(SSL *s, STACK_OF(X509) *sk, X509 *x, int vfy)
4653 {
4654 int rv, start_idx, i;
4655 if (x == NULL)
4656 {
4657 x = sk_X509_value(sk, 0);
4658 start_idx = 1;
4659 }
4660 else
4661 start_idx = 0;
4662
4663 rv = ssl_security_cert(s, NULL, x, vfy, 1);
4664 if (rv != 1)
4665 return rv;
4666
4667 for (i = start_idx; i < sk_X509_num(sk); i++)
4668 {
4669 x = sk_X509_value(sk, i);
4670 rv = ssl_security_cert(s, NULL, x, vfy, 0);
4671 if (rv != 1)
4672 return rv;
4673 }
4674 return 1;
4675 }
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