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Fix SRTP s_client/s_server options
[thirdparty/openssl.git] / ssl / s3_srvr.c
CommitLineData
cbb92dfa 1/* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
58964a49 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
d02b48c6
RE		 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.
0f113f3e 8 *
d02b48c6
RE		 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).
0f113f3e 15 *
d02b48c6
RE		 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.
0f113f3e 22 *
d02b48c6
RE		 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 :-).
0f113f3e 37 * 4. If you include any Windows specific code (or a derivative thereof) from
d02b48c6
RE		 38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
0f113f3e 40 *
d02b48c6
RE		 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.
0f113f3e 52 *
d02b48c6
RE		 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 */
8e2f6b79 58/* ====================================================================
52b8dad8 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
8e2f6b79
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
0f113f3e 66 * notice, this list of conditions and the following disclaimer.
8e2f6b79
BM		 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 */
ea262260
BM		 111/* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
0f113f3e 114 * Portions of the attached software ("Contribution") are developed by
ea262260
BM		 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116 *
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
119 *
ea262260
BM		 120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
ddac1974
NL		 124/* ====================================================================
125 * Copyright 2005 Nokia. All rights reserved.
126 *
127 * The portions of the attached software ("Contribution") is developed by
128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129 * license.
130 *
131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133 * support (see RFC 4279) to OpenSSL.
134 *
135 * No patent licenses or other rights except those expressly stated in
136 * the OpenSSL open source license shall be deemed granted or received
137 * expressly, by implication, estoppel, or otherwise.
138 *
139 * No assurances are provided by Nokia that the Contribution does not
140 * infringe the patent or other intellectual property rights of any third
141 * party or that the license provides you with all the necessary rights
142 * to make use of the Contribution.
143 *
144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148 * OTHERWISE.
149 */
d02b48c6 150
de469ef2 151
d02b48c6 152#include <stdio.h>
7b63c0fa 153#include "ssl_locl.h"
68570797 154#include "internal/constant_time_locl.h"
ec577822
BM		 155#include <openssl/buffer.h>
156#include <openssl/rand.h>
157#include <openssl/objects.h>
158#include <openssl/evp.h>
6434abbf 159#include <openssl/hmac.h>
ec577822 160#include <openssl/x509.h>
3eeaab4b 161#ifndef OPENSSL_NO_DH
0f113f3e 162# include <openssl/dh.h>
3eeaab4b 163#endif
d095b68d 164#include <openssl/bn.h>
dbad1690 165#include <openssl/md5.h>
f9b3bff6 166
d45ba43d
MC		 167static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, unsigned char *p,
168 int num, STACK_OF(SSL_CIPHER) **skp, int sslv2format);
169
d02b48c6 170
edc032b5 171#ifndef OPENSSL_NO_SRP
71fa4513 172static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
0f113f3e
MC		 173{
174 int ret = SSL_ERROR_NONE;
175
176 *al = SSL_AD_UNRECOGNIZED_NAME;
177
178 if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
179 (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) {
180 if (s->srp_ctx.login == NULL) {
181 /*
182 * RFC 5054 says SHOULD reject, we do so if There is no srp
183 * login name
184 */
185 ret = SSL3_AL_FATAL;
186 *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
187 } else {
188 ret = SSL_srp_server_param_with_username(s, al);
189 }
190 }
191 return ret;
192}
edc032b5
BL		 193#endif
194
6b691a5c 195int ssl3_accept(SSL *s)
0f113f3e
MC		 196{
197 BUF_MEM *buf;
198 unsigned long alg_k, Time = (unsigned long)time(NULL);
199 void (*cb) (const SSL *ssl, int type, int val) = NULL;
200 int ret = -1;
201 int new_state, state, skip = 0;
202
203 RAND_add(&Time, sizeof(Time), 0);
204 ERR_clear_error();
205 clear_sys_error();
206
207 if (s->info_callback != NULL)
208 cb = s->info_callback;
209 else if (s->ctx->info_callback != NULL)
210 cb = s->ctx->info_callback;
211
212 /* init things to blank */
213 s->in_handshake++;
69f68237 214 if (!SSL_in_init(s) || SSL_in_before(s)) {
61986d32 215 if (!SSL_clear(s))
69f68237
MC		 216 return -1;
217 }
0f113f3e 218
4817504d 219#ifndef OPENSSL_NO_HEARTBEATS
0f113f3e
MC		 220 /*
221 * If we're awaiting a HeartbeatResponse, pretend we already got and
222 * don't await it anymore, because Heartbeats don't make sense during
223 * handshakes anyway.
224 */
225 if (s->tlsext_hb_pending) {
226 s->tlsext_hb_pending = 0;
227 s->tlsext_hb_seq++;
228 }
4817504d
DSH		 229#endif
230
0f113f3e
MC		 231 for (;;) {
232 state = s->state;
233
234 switch (s->state) {
235 case SSL_ST_RENEGOTIATE:
236 s->renegotiate = 1;
237 /* s->state=SSL_ST_ACCEPT; */
238
239 case SSL_ST_BEFORE:
240 case SSL_ST_ACCEPT:
241 case SSL_ST_BEFORE | SSL_ST_ACCEPT:
242 case SSL_ST_OK | SSL_ST_ACCEPT:
243
244 s->server = 1;
245 if (cb != NULL)
246 cb(s, SSL_CB_HANDSHAKE_START, 1);
247
32ec4153 248 if ((s->version >> 8 != 3) && s->version != TLS_ANY_VERSION) {
0f113f3e 249 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
cf9b0b6f 250 s->state = SSL_ST_ERR;
0f113f3e
MC		 251 return -1;
252 }
253
254 if (!ssl_security(s, SSL_SECOP_VERSION, 0, s->version, NULL)) {
255 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_VERSION_TOO_LOW);
256 return -1;
257 }
258
259 s->type = SSL_ST_ACCEPT;
260
261 if (s->init_buf == NULL) {
262 if ((buf = BUF_MEM_new()) == NULL) {
263 ret = -1;
cf9b0b6f 264 s->state = SSL_ST_ERR;
0f113f3e
MC		 265 goto end;
266 }
267 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
268 BUF_MEM_free(buf);
269 ret = -1;
cf9b0b6f 270 s->state = SSL_ST_ERR;
0f113f3e
MC		 271 goto end;
272 }
273 s->init_buf = buf;
274 }
275
276 if (!ssl3_setup_buffers(s)) {
277 ret = -1;
cf9b0b6f 278 s->state = SSL_ST_ERR;
0f113f3e
MC		 279 goto end;
280 }
281
282 s->init_num = 0;
283 s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
0f113f3e
MC		 284 /*
285 * Should have been reset by ssl3_get_finished, too.
286 */
287 s->s3->change_cipher_spec = 0;
288
289 if (s->state != SSL_ST_RENEGOTIATE) {
290 /*
291 * Ok, we now need to push on a buffering BIO so that the
292 * output is sent in a way that TCP likes :-)
293 */
294 if (!ssl_init_wbio_buffer(s, 1)) {
295 ret = -1;
cf9b0b6f 296 s->state = SSL_ST_ERR;
0f113f3e
MC		 297 goto end;
298 }
299
300 ssl3_init_finished_mac(s);
301 s->state = SSL3_ST_SR_CLNT_HELLO_A;
302 s->ctx->stats.sess_accept++;
303 } else if (!s->s3->send_connection_binding &&
304 !(s->options &
305 SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) {
306 /*
307 * Server attempting to renegotiate with client that doesn't
308 * support secure renegotiation.
309 */
310 SSLerr(SSL_F_SSL3_ACCEPT,
311 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
312 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
313 ret = -1;
cf9b0b6f 314 s->state = SSL_ST_ERR;
0f113f3e
MC		 315 goto end;
316 } else {
317 /*
318 * s->state == SSL_ST_RENEGOTIATE, we will just send a
319 * HelloRequest
320 */
321 s->ctx->stats.sess_accept_renegotiate++;
322 s->state = SSL3_ST_SW_HELLO_REQ_A;
323 }
324 break;
325
326 case SSL3_ST_SW_HELLO_REQ_A:
327 case SSL3_ST_SW_HELLO_REQ_B:
328
329 s->shutdown = 0;
330 ret = ssl3_send_hello_request(s);
331 if (ret <= 0)
332 goto end;
333 s->s3->tmp.next_state = SSL3_ST_SW_HELLO_REQ_C;
334 s->state = SSL3_ST_SW_FLUSH;
335 s->init_num = 0;
336
337 ssl3_init_finished_mac(s);
338 break;
339
340 case SSL3_ST_SW_HELLO_REQ_C:
341 s->state = SSL_ST_OK;
342 break;
343
344 case SSL3_ST_SR_CLNT_HELLO_A:
345 case SSL3_ST_SR_CLNT_HELLO_B:
346 case SSL3_ST_SR_CLNT_HELLO_C:
347
348 ret = ssl3_get_client_hello(s);
349 if (ret <= 0)
350 goto end;
edc032b5 351#ifndef OPENSSL_NO_SRP
0f113f3e
MC		 352 s->state = SSL3_ST_SR_CLNT_HELLO_D;
353 case SSL3_ST_SR_CLNT_HELLO_D:
354 {
355 int al;
356 if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) {
357 /*
358 * callback indicates firther work to be done
359 */
360 s->rwstate = SSL_X509_LOOKUP;
361 goto end;
362 }
363 if (ret != SSL_ERROR_NONE) {
364 ssl3_send_alert(s, SSL3_AL_FATAL, al);
365 /*
366 * This is not really an error but the only means to for
367 * a client to detect whether srp is supported.
368 */
369 if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
370 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_CLIENTHELLO_TLSEXT);
371 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
372 ret = -1;
cf9b0b6f 373 s->state = SSL_ST_ERR;
0f113f3e
MC		 374 goto end;
375 }
376 }
377#endif
378
379 s->renegotiate = 2;
380 s->state = SSL3_ST_SW_SRVR_HELLO_A;
381 s->init_num = 0;
382 break;
383
384 case SSL3_ST_SW_SRVR_HELLO_A:
385 case SSL3_ST_SW_SRVR_HELLO_B:
386 ret = ssl3_send_server_hello(s);
387 if (ret <= 0)
388 goto end;
e481f9b9 389
0f113f3e
MC		 390 if (s->hit) {
391 if (s->tlsext_ticket_expected)
392 s->state = SSL3_ST_SW_SESSION_TICKET_A;
393 else
394 s->state = SSL3_ST_SW_CHANGE_A;
e481f9b9 395 } else {
0f113f3e 396 s->state = SSL3_ST_SW_CERT_A;
e481f9b9 397 }
0f113f3e
MC		 398 s->init_num = 0;
399 break;
400
401 case SSL3_ST_SW_CERT_A:
402 case SSL3_ST_SW_CERT_B:
403 /* Check if it is anon DH or anon ECDH, */
55a9a16f 404 /* normal PSK or SRP */
85269210
DSH		 405 if (!(s->s3->tmp.new_cipher->algorithm_auth &
406 (SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
0f113f3e
MC		 407 ret = ssl3_send_server_certificate(s);
408 if (ret <= 0)
409 goto end;
e481f9b9 410
0f113f3e
MC		 411 if (s->tlsext_status_expected)
412 s->state = SSL3_ST_SW_CERT_STATUS_A;
413 else
414 s->state = SSL3_ST_SW_KEY_EXCH_A;
415 } else {
416 skip = 1;
417 s->state = SSL3_ST_SW_KEY_EXCH_A;
418 }
0f113f3e
MC		 419 s->init_num = 0;
420 break;
421
422 case SSL3_ST_SW_KEY_EXCH_A:
423 case SSL3_ST_SW_KEY_EXCH_B:
424 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
425
426 /*
427 * clear this, it may get reset by
428 * send_server_key_exchange
429 */
430 s->s3->tmp.use_rsa_tmp = 0;
431
432 /*
433 * only send if a DH key exchange, fortezza or RSA but we have a
434 * sign only certificate PSK: may send PSK identity hints For
435 * ECC ciphersuites, we send a serverKeyExchange message only if
436 * the cipher suite is either ECDH-anon or ECDHE. In other cases,
437 * the server certificate contains the server's public key for
438 * key exchange.
439 */
440 if (0
441 /*
442 * PSK: send ServerKeyExchange if PSK identity hint if
443 * provided
444 */
ddac1974 445#ifndef OPENSSL_NO_PSK
85269210
DSH		 446 /* Only send SKE if we have identity hint for plain PSK */
447 || ((alg_k & (SSL_kPSK | SSL_kRSAPSK)) && s->ctx->psk_identity_hint)
448 /* For other PSK always send SKE */
449 || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK)))
edc032b5
BL		 450#endif
451#ifndef OPENSSL_NO_SRP
0f113f3e
MC		 452 /* SRP: send ServerKeyExchange */
453 || (alg_k & SSL_kSRP)
ddac1974 454#endif
0f113f3e
MC		 455 || (alg_k & SSL_kDHE)
456 || (alg_k & SSL_kECDHE)
457 || ((alg_k & SSL_kRSA)
458 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
459 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
739a5eee 460 && EVP_PKEY_size(s->cert->pkeys
0f113f3e
MC		 461 [SSL_PKEY_RSA_ENC].privatekey) *
462 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
463 )
464 )
465 )
466 ) {
467 ret = ssl3_send_server_key_exchange(s);
468 if (ret <= 0)
469 goto end;
470 } else
471 skip = 1;
472
473 s->state = SSL3_ST_SW_CERT_REQ_A;
474 s->init_num = 0;
475 break;
476
477 case SSL3_ST_SW_CERT_REQ_A:
478 case SSL3_ST_SW_CERT_REQ_B:
479 if ( /* don't request cert unless asked for it: */
480 !(s->verify_mode & SSL_VERIFY_PEER) ||
481 /*
482 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
483 * during re-negotiation:
484 */
485 ((s->session->peer != NULL) &&
486 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
487 /*
488 * never request cert in anonymous ciphersuites (see
489 * section "Certificate request" in SSL 3 drafts and in
490 * RFC 2246):
491 */
492 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
0f113f3e 493 /*
55a9a16f
MC		 494 * ... except when the application insists on
495 * verification (against the specs, but s3_clnt.c accepts
496 * this for SSL 3)
0f113f3e 497 */
55a9a16f 498 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
0f113f3e
MC		 499 /* don't request certificate for SRP auth */
500 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
501 /*
502 * With normal PSK Certificates and Certificate Requests
503 * are omitted
504 */
a3f7ff2b 505 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) {
0f113f3e
MC		 506 /* no cert request */
507 skip = 1;
508 s->s3->tmp.cert_request = 0;
509 s->state = SSL3_ST_SW_SRVR_DONE_A;
124037fd
DSH		 510 if (!ssl3_digest_cached_records(s, 0)) {
511 s->state = SSL_ST_ERR;
512 return -1;
cf9b0b6f 513 }
0f113f3e
MC		 514 } else {
515 s->s3->tmp.cert_request = 1;
516 ret = ssl3_send_certificate_request(s);
517 if (ret <= 0)
518 goto end;
0f113f3e 519 s->state = SSL3_ST_SW_SRVR_DONE_A;
0f113f3e
MC		 520 s->init_num = 0;
521 }
522 break;
523
524 case SSL3_ST_SW_SRVR_DONE_A:
525 case SSL3_ST_SW_SRVR_DONE_B:
526 ret = ssl3_send_server_done(s);
527 if (ret <= 0)
528 goto end;
529 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
530 s->state = SSL3_ST_SW_FLUSH;
531 s->init_num = 0;
532 break;
533
534 case SSL3_ST_SW_FLUSH:
535
536 /*
537 * This code originally checked to see if any data was pending
538 * using BIO_CTRL_INFO and then flushed. This caused problems as
539 * documented in PR#1939. The proposed fix doesn't completely
540 * resolve this issue as buggy implementations of
541 * BIO_CTRL_PENDING still exist. So instead we just flush
542 * unconditionally.
543 */
544
545 s->rwstate = SSL_WRITING;
546 if (BIO_flush(s->wbio) <= 0) {
547 ret = -1;
548 goto end;
549 }
550 s->rwstate = SSL_NOTHING;
551
552 s->state = s->s3->tmp.next_state;
553 break;
554
555 case SSL3_ST_SR_CERT_A:
556 case SSL3_ST_SR_CERT_B:
557 if (s->s3->tmp.cert_request) {
558 ret = ssl3_get_client_certificate(s);
559 if (ret <= 0)
560 goto end;
561 }
562 s->init_num = 0;
563 s->state = SSL3_ST_SR_KEY_EXCH_A;
564 break;
565
566 case SSL3_ST_SR_KEY_EXCH_A:
567 case SSL3_ST_SR_KEY_EXCH_B:
568 ret = ssl3_get_client_key_exchange(s);
569 if (ret <= 0)
570 goto end;
571 if (ret == 2) {
572 /*
573 * For the ECDH ciphersuites when the client sends its ECDH
574 * pub key in a certificate, the CertificateVerify message is
575 * not sent. Also for GOST ciphersuites when the client uses
576 * its key from the certificate for key exchange.
577 */
657da85e 578 s->state = SSL3_ST_SR_CHANGE_A;
0f113f3e
MC		 579 s->init_num = 0;
580 } else if (SSL_USE_SIGALGS(s)) {
581 s->state = SSL3_ST_SR_CERT_VRFY_A;
582 s->init_num = 0;
583 if (!s->session->peer)
584 break;
0f113f3e
MC		 585 if (!s->s3->handshake_buffer) {
586 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
cf9b0b6f 587 s->state = SSL_ST_ERR;
0f113f3e
MC		 588 return -1;
589 }
0cfb0e75
DSH		 590 /*
591 * For sigalgs freeze the handshake buffer. If we support
124037fd 592 * extms we've done this already so this is a no-op
0cfb0e75 593 */
124037fd
DSH		 594 if (!ssl3_digest_cached_records(s, 1)) {
595 s->state = SSL_ST_ERR;
596 return -1;
0cfb0e75 597 }
0f113f3e
MC		 598 } else {
599 int offset = 0;
600 int dgst_num;
601
602 s->state = SSL3_ST_SR_CERT_VRFY_A;
603 s->init_num = 0;
604
605 /*
606 * We need to get hashes here so if there is a client cert,
607 * it can be verified FIXME - digest processing for
608 * CertificateVerify should be generalized. But it is next
609 * step
610 */
124037fd
DSH		 611 if (!ssl3_digest_cached_records(s, 0)) {
612 s->state = SSL_ST_ERR;
613 return -1;
cf9b0b6f 614 }
0f113f3e
MC		 615 for (dgst_num = 0; dgst_num < SSL_MAX_DIGEST; dgst_num++)
616 if (s->s3->handshake_dgst[dgst_num]) {
617 int dgst_size;
618
619 s->method->ssl3_enc->cert_verify_mac(s,
620 EVP_MD_CTX_type
621 (s->
622 s3->handshake_dgst
623 [dgst_num]),
624 &(s->s3->
625 tmp.cert_verify_md
626 [offset]));
627 dgst_size =
628 EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
629 if (dgst_size < 0) {
cf9b0b6f 630 s->state = SSL_ST_ERR;
0f113f3e
MC		 631 ret = -1;
632 goto end;
633 }
634 offset += dgst_size;
635 }
636 }
637 break;
638
639 case SSL3_ST_SR_CERT_VRFY_A:
640 case SSL3_ST_SR_CERT_VRFY_B:
0f113f3e
MC		 641 ret = ssl3_get_cert_verify(s);
642 if (ret <= 0)
643 goto end;
d02b48c6 644
657da85e 645 s->state = SSL3_ST_SR_CHANGE_A;
0f113f3e
MC		 646 s->init_num = 0;
647 break;
d02b48c6 648
e481f9b9 649#if !defined(OPENSSL_NO_NEXTPROTONEG)
0f113f3e
MC		 650 case SSL3_ST_SR_NEXT_PROTO_A:
651 case SSL3_ST_SR_NEXT_PROTO_B:
0f113f3e
MC		 652 ret = ssl3_get_next_proto(s);
653 if (ret <= 0)
654 goto end;
655 s->init_num = 0;
656 s->state = SSL3_ST_SR_FINISHED_A;
657 break;
ee2ffc27
BL		 658#endif
659
657da85e
MC		 660
661 case SSL3_ST_SR_CHANGE_A:
662 case SSL3_ST_SR_CHANGE_B:
663 ret = ssl3_get_change_cipher_spec(s, SSL3_ST_SR_CHANGE_A,
664 SSL3_ST_SR_CHANGE_B);
665 if (ret <= 0)
666 goto end;
667
668#if defined(OPENSSL_NO_NEXTPROTONEG)
669 s->state = SSL3_ST_SR_FINISHED_A;
670#else
671 if (s->s3->next_proto_neg_seen)
672 s->state = SSL3_ST_SR_NEXT_PROTO_A;
673 else
674 s->state = SSL3_ST_SR_FINISHED_A;
675#endif
676 s->init_num = 0;
677 break;
678
0f113f3e
MC		 679 case SSL3_ST_SR_FINISHED_A:
680 case SSL3_ST_SR_FINISHED_B:
0f113f3e
MC		 681 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
682 SSL3_ST_SR_FINISHED_B);
683 if (ret <= 0)
684 goto end;
685 if (s->hit)
686 s->state = SSL_ST_OK;
0f113f3e
MC		 687 else if (s->tlsext_ticket_expected)
688 s->state = SSL3_ST_SW_SESSION_TICKET_A;
0f113f3e
MC		 689 else
690 s->state = SSL3_ST_SW_CHANGE_A;
691 s->init_num = 0;
692 break;
d02b48c6 693
0f113f3e
MC		 694 case SSL3_ST_SW_SESSION_TICKET_A:
695 case SSL3_ST_SW_SESSION_TICKET_B:
696 ret = ssl3_send_newsession_ticket(s);
697 if (ret <= 0)
698 goto end;
699 s->state = SSL3_ST_SW_CHANGE_A;
700 s->init_num = 0;
701 break;
702
703 case SSL3_ST_SW_CERT_STATUS_A:
704 case SSL3_ST_SW_CERT_STATUS_B:
705 ret = ssl3_send_cert_status(s);
706 if (ret <= 0)
707 goto end;
708 s->state = SSL3_ST_SW_KEY_EXCH_A;
709 s->init_num = 0;
710 break;
67c8e7f4 711
0f113f3e
MC		 712 case SSL3_ST_SW_CHANGE_A:
713 case SSL3_ST_SW_CHANGE_B:
714
715 s->session->cipher = s->s3->tmp.new_cipher;
716 if (!s->method->ssl3_enc->setup_key_block(s)) {
717 ret = -1;
cf9b0b6f 718 s->state = SSL_ST_ERR;
0f113f3e
MC		 719 goto end;
720 }
721
722 ret = ssl3_send_change_cipher_spec(s,
723 SSL3_ST_SW_CHANGE_A,
724 SSL3_ST_SW_CHANGE_B);
725
726 if (ret <= 0)
727 goto end;
728 s->state = SSL3_ST_SW_FINISHED_A;
729 s->init_num = 0;
730
731 if (!s->method->ssl3_enc->change_cipher_state(s,
732 SSL3_CHANGE_CIPHER_SERVER_WRITE))
733 {
734 ret = -1;
cf9b0b6f 735 s->state = SSL_ST_ERR;
0f113f3e
MC		 736 goto end;
737 }
738
739 break;
740
741 case SSL3_ST_SW_FINISHED_A:
742 case SSL3_ST_SW_FINISHED_B:
743 ret = ssl3_send_finished(s,
744 SSL3_ST_SW_FINISHED_A,
745 SSL3_ST_SW_FINISHED_B,
746 s->method->
747 ssl3_enc->server_finished_label,
748 s->method->
749 ssl3_enc->server_finished_label_len);
750 if (ret <= 0)
751 goto end;
752 s->state = SSL3_ST_SW_FLUSH;
753 if (s->hit) {
657da85e 754 s->s3->tmp.next_state = SSL3_ST_SR_CHANGE_A;
0f113f3e
MC		 755 } else
756 s->s3->tmp.next_state = SSL_ST_OK;
757 s->init_num = 0;
758 break;
759
760 case SSL_ST_OK:
761 /* clean a few things up */
762 ssl3_cleanup_key_block(s);
763
764 BUF_MEM_free(s->init_buf);
765 s->init_buf = NULL;
766
767 /* remove buffering on output */
768 ssl_free_wbio_buffer(s);
769
770 s->init_num = 0;
771
772 if (s->renegotiate == 2) { /* skipped if we just sent a
773 * HelloRequest */
774 s->renegotiate = 0;
775 s->new_session = 0;
776
777 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
778
779 s->ctx->stats.sess_accept_good++;
780 /* s->server=1; */
781 s->handshake_func = ssl3_accept;
782
783 if (cb != NULL)
784 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
785 }
786
787 ret = 1;
788 goto end;
789 /* break; */
790
a89db885 791 case SSL_ST_ERR:
0f113f3e
MC		 792 default:
793 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNKNOWN_STATE);
794 ret = -1;
795 goto end;
796 /* break; */
797 }
798
799 if (!s->s3->tmp.reuse_message && !skip) {
800 if (s->debug) {
801 if ((ret = BIO_flush(s->wbio)) <= 0)
802 goto end;
803 }
804
805 if ((cb != NULL) && (s->state != state)) {
806 new_state = s->state;
807 s->state = state;
808 cb(s, SSL_CB_ACCEPT_LOOP, 1);
809 s->state = new_state;
810 }
811 }
812 skip = 0;
813 }
814 end:
815 /* BIO_flush(s->wbio); */
816
817 s->in_handshake--;
818 if (cb != NULL)
819 cb(s, SSL_CB_ACCEPT_EXIT, ret);
820 return (ret);
821}
d02b48c6 822
36d16f8e 823int ssl3_send_hello_request(SSL *s)
0f113f3e 824{
d02b48c6 825
0f113f3e 826 if (s->state == SSL3_ST_SW_HELLO_REQ_A) {
61986d32 827 if (!ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0)) {
77d514c5
MC		 828 SSLerr(SSL_F_SSL3_SEND_HELLO_REQUEST, ERR_R_INTERNAL_ERROR);
829 return -1;
830 }
0f113f3e
MC		 831 s->state = SSL3_ST_SW_HELLO_REQ_B;
832 }
d02b48c6 833
0f113f3e
MC		 834 /* SSL3_ST_SW_HELLO_REQ_B */
835 return ssl_do_write(s);
836}
d02b48c6 837
36d16f8e 838int ssl3_get_client_hello(SSL *s)
0f113f3e 839{
9ceb2426
MC		 840 int i, ok, al = SSL_AD_INTERNAL_ERROR, ret = -1;
841 unsigned int j, cipherlen, complen;
842 unsigned int cookie_len = 0;
0f113f3e
MC		 843 long n;
844 unsigned long id;
0f113f3e 845 SSL_CIPHER *c;
09b6c2ef 846#ifndef OPENSSL_NO_COMP
d45ba43d 847 unsigned char *q = NULL;
0f113f3e 848 SSL_COMP *comp = NULL;
09b6c2ef 849#endif
0f113f3e 850 STACK_OF(SSL_CIPHER) *ciphers = NULL;
32ec4153 851 int protverr = 1;
9ceb2426
MC		 852 PACKET pkt;
853 unsigned char *sess, *cdata;
0f113f3e
MC		 854
855 if (s->state == SSL3_ST_SR_CLNT_HELLO_C && !s->first_packet)
856 goto retry_cert;
857
858 /*
859 * We do this so that we will respond with our native type. If we are
860 * TLSv1 and we get SSLv3, we will respond with TLSv1, This down
861 * switching should be handled by a different method. If we are SSLv3, we
862 * will respond with SSLv3, even if prompted with TLSv1.
863 */
864 if (s->state == SSL3_ST_SR_CLNT_HELLO_A) {
865 s->state = SSL3_ST_SR_CLNT_HELLO_B;
866 }
867 s->first_packet = 1;
868 n = s->method->ssl_get_message(s,
869 SSL3_ST_SR_CLNT_HELLO_B,
870 SSL3_ST_SR_CLNT_HELLO_C,
871 SSL3_MT_CLIENT_HELLO,
872 SSL3_RT_MAX_PLAIN_LENGTH, &ok);
873
874 if (!ok)
875 return ((int)n);
876 s->first_packet = 0;
9ceb2426 877 PACKET_buf_init(&pkt, s->init_msg, n);
0f113f3e 878
32ec4153 879 /* First lets get s->client_version set correctly */
b2ce0337 880 if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) {
9ceb2426
MC		 881 unsigned int version;
882 unsigned int mt;
32ec4153
MC		 883 /*-
884 * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
885 * header is sent directly on the wire, not wrapped as a TLS
886 * record. Our record layer just processes the message length and passes
887 * the rest right through. Its format is:
888 * Byte Content
889 * 0-1 msg_length - decoded by the record layer
890 * 2 msg_type - s->init_msg points here
891 * 3-4 version
892 * 5-6 cipher_spec_length
893 * 7-8 session_id_length
894 * 9-10 challenge_length
895 * ... ...
896 */
897
9ceb2426
MC		 898 if (!PACKET_get_1(&pkt, &mt)
899 || mt != SSL2_MT_CLIENT_HELLO) {
32ec4153
MC		 900 /*
901 * Should never happen. We should have tested this in the record
902 * layer in order to have determined that this is a SSLv2 record
903 * in the first place
904 */
32ec4153 905 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
d45ba43d 906 goto err;
32ec4153
MC		 907 }
908
9ceb2426
MC		 909 if (!PACKET_get_net_2(&pkt, &version)) {
910 /* No protocol version supplied! */
911 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
912 goto err;
913 }
914 if (version == 0x0002) {
32ec4153
MC		 915 /* This is real SSLv2. We don't support it. */
916 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
917 goto err;
9ceb2426 918 } else if ((version & 0xff00) == (SSL3_VERSION_MAJOR << 8)) {
32ec4153 919 /* SSLv3/TLS */
9ceb2426 920 s->client_version = version;
32ec4153
MC		 921 } else {
922 /* No idea what protocol this is */
923 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
924 goto err;
925 }
926 } else {
927 /*
9ceb2426
MC		 928 * use version from inside client hello, not from record header (may
929 * differ: see RFC 2246, Appendix E, second paragraph)
32ec4153 930 */
9ceb2426 931 if(!PACKET_get_net_2(&pkt, (unsigned int *)&s->client_version)) {
32ec4153
MC		 932 al = SSL_AD_DECODE_ERROR;
933 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
934 goto f_err;
935 }
5e9f0eeb
MC		 936 }
937
32ec4153
MC		 938 /* Do SSL/TLS version negotiation if applicable */
939 if (!SSL_IS_DTLS(s)) {
940 if (s->version != TLS_ANY_VERSION) {
b2ce0337 941 if (s->client_version >= s->version) {
32ec4153
MC		 942 protverr = 0;
943 }
b2ce0337 944 } else if (s->client_version >= SSL3_VERSION) {
32ec4153
MC		 945 switch(s->client_version) {
946 default:
947 case TLS1_2_VERSION:
948 if(!(s->options & SSL_OP_NO_TLSv1_2)) {
949 s->version = TLS1_2_VERSION;
950 s->method = TLSv1_2_server_method();
951 protverr = 0;
952 break;
953 }
954 /* Deliberately fall through */
955 case TLS1_1_VERSION:
956 if(!(s->options & SSL_OP_NO_TLSv1_1)) {
957 s->version = TLS1_1_VERSION;
958 s->method = TLSv1_1_server_method();
959 protverr = 0;
960 break;
961 }
962 /* Deliberately fall through */
963 case TLS1_VERSION:
964 if(!(s->options & SSL_OP_NO_TLSv1)) {
965 s->version = TLS1_VERSION;
966 s->method = TLSv1_server_method();
967 protverr = 0;
968 break;
969 }
970 /* Deliberately fall through */
971 case SSL3_VERSION:
b2ce0337 972#ifndef OPENSSL_NO_SSL3
32ec4153
MC		 973 if(!(s->options & SSL_OP_NO_SSLv3)) {
974 s->version = SSL3_VERSION;
975 s->method = SSLv3_server_method();
976 protverr = 0;
977 break;
978 }
b2ce0337
MC		 979#else
980 break;
981#endif
32ec4153
MC		 982 }
983 }
b2ce0337
MC		 984 } else if (s->client_version <= s->version
985 || s->method->version == DTLS_ANY_VERSION) {
32ec4153
MC		 986 /*
987 * For DTLS we just check versions are potentially compatible. Version
988 * negotiation comes later.
989 */
990 protverr = 0;
991 }
992
993 if (protverr) {
994 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
995 if ((!s->enc_write_ctx && !s->write_hash)) {
0f113f3e
MC		 996 /*
997 * similar to ssl3_get_record, send alert using remote version
998 * number
999 */
1000 s->version = s->client_version;
1001 }
1002 al = SSL_AD_PROTOCOL_VERSION;
1003 goto f_err;
1004 }
1005
32ec4153
MC		 1006 if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) {
1007 /*
1008 * Handle an SSLv2 backwards compatible ClientHello
1009 * Note, this is only for SSLv3+ using the backward compatible format.
1010 * Real SSLv2 is not supported, and is rejected above.
1011 */
1012 unsigned int csl, sil, cl;
0f113f3e 1013
9ceb2426
MC		 1014 if (!PACKET_get_net_2(&pkt, &csl)
1015 || !PACKET_get_net_2(&pkt, &sil)
1016 || !PACKET_get_net_2(&pkt, &cl)) {
5e9f0eeb 1017 }
0f113f3e 1018
32ec4153
MC		 1019 if (csl == 0) {
1020 /* we need at least one cipher */
1021 al = SSL_AD_ILLEGAL_PARAMETER;
1022 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_CIPHERS_SPECIFIED);
1023 goto f_err;
1024 }
0f113f3e 1025
9ceb2426
MC		 1026 if (!PACKET_get_bytes(&pkt, &cdata, csl)) {
1027 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_RECORD_LENGTH_MISMATCH);
1028 al = SSL_AD_DECODE_ERROR;
1029 goto f_err;
1030 }
1031
1032 if (ssl_bytes_to_cipher_list(s, cdata, csl, &(ciphers), 1) == NULL) {
32ec4153
MC		 1033 goto err;
1034 }
0f113f3e 1035
32ec4153
MC		 1036 /*
1037 * Ignore any session id. We don't allow resumption in a backwards
1038 * compatible ClientHello
1039 */
9ceb2426
MC		 1040 if (!PACKET_forward(&pkt, sil)) {
1041 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_RECORD_LENGTH_MISMATCH);
1042 al = SSL_AD_DECODE_ERROR;
1043 goto f_err;
1044 }
32ec4153 1045 s->hit = 0;
5e9f0eeb 1046
0f113f3e
MC		 1047 if (!ssl_get_new_session(s, 1))
1048 goto err;
32ec4153
MC		 1049
1050 /* Load the client random */
1051 i = (cl > SSL3_RANDOM_SIZE) ? SSL3_RANDOM_SIZE : cl;
1052 memset(s->s3->client_random, 0, SSL3_RANDOM_SIZE);
9ceb2426
MC		 1053 if (!PACKET_peek_copy_bytes(&pkt, s->s3->client_random, i)
1054 || !PACKET_forward(&pkt, cl)
1055 || !PACKET_remaining(&pkt) == 0) {
1056 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_RECORD_LENGTH_MISMATCH);
1057 al = SSL_AD_DECODE_ERROR;
1058 goto f_err;
1059 }
32ec4153 1060
b2ce0337
MC		 1061 /* No compression, so set complen to 0 */
1062 complen = 0;
0f113f3e 1063 } else {
32ec4153
MC		 1064 /* If we get here we've got SSLv3+ in an SSLv3+ record */
1065
9ceb2426
MC		 1066 /* load the client random and get the session-id */
1067 if (!PACKET_copy_bytes(&pkt, s->s3->client_random, SSL3_RANDOM_SIZE)
1068 || !PACKET_get_1(&pkt, &j)
1069 || !PACKET_get_bytes(&pkt, &sess, j)) {
1070 al = SSL_AD_DECODE_ERROR;
1071 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
1072 goto f_err;
1073 }
32ec4153 1074
0f113f3e 1075 /*
32ec4153
MC		 1076 * If we require cookies and this ClientHello doesn't contain one, just
1077 * return since we do not want to allocate any memory yet. So check
1078 * cookie length...
0f113f3e 1079 */
32ec4153 1080 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
0f113f3e 1081
9ceb2426 1082 if (!PACKET_peek_1(&pkt, &cookie_len)) {
32ec4153
MC		 1083 al = SSL_AD_DECODE_ERROR;
1084 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
1085 goto f_err;
1086 }
0f113f3e 1087
9ceb2426 1088 if (cookie_len == 0)
32ec4153 1089 return 1;
5e9f0eeb 1090 }
0f113f3e 1091
32ec4153 1092 s->hit = 0;
0f113f3e 1093 /*
32ec4153
MC		 1094 * Versions before 0.9.7 always allow clients to resume sessions in
1095 * renegotiation. 0.9.7 and later allow this by default, but optionally
1096 * ignore resumption requests with flag
1097 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1098 * than a change to default behavior so that applications relying on
1099 * this for security won't even compile against older library versions).
1100 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to
1101 * request renegotiation but not a new session (s->new_session remains
1102 * unset): for servers, this essentially just means that the
1103 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
1104 * ignored.
0f113f3e 1105 */
32ec4153
MC		 1106 if ((s->new_session
1107 && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
1108 if (!ssl_get_new_session(s, 1))
1109 goto err;
1110 } else {
9ceb2426 1111 i = ssl_get_prev_session(s, &pkt, sess, j);
32ec4153
MC		 1112 /*
1113 * Only resume if the session's version matches the negotiated
1114 * version.
1115 * RFC 5246 does not provide much useful advice on resumption
1116 * with a different protocol version. It doesn't forbid it but
1117 * the sanity of such behaviour would be questionable.
1118 * In practice, clients do not accept a version mismatch and
1119 * will abort the handshake with an error.
1120 */
1121 if (i == 1 && s->version == s->session->ssl_version) {
1122 /* previous session */
1123 s->hit = 1;
1124 } else if (i == -1)
1125 goto err;
1126 else {
1127 /* i == 0 */
1128 if (!ssl_get_new_session(s, 1))
1129 goto err;
1130 }
0f113f3e
MC		 1131 }
1132
32ec4153 1133 if (SSL_IS_DTLS(s)) {
9ceb2426 1134 if (!PACKET_get_1(&pkt, &cookie_len)) {
32ec4153
MC		 1135 al = SSL_AD_DECODE_ERROR;
1136 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
0f113f3e
MC		 1137 goto f_err;
1138 }
32ec4153
MC		 1139 /*
1140 * The ClientHello may contain a cookie even if the
1141 * HelloVerify message has not been sent--make sure that it
1142 * does not cause an overflow.
1143 */
1144 if (cookie_len > sizeof(s->d1->rcvd_cookie)) {
1145 /* too much data */
1146 al = SSL_AD_DECODE_ERROR;
1147 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
0f113f3e
MC		 1148 goto f_err;
1149 }
32ec4153
MC		 1150
1151 /* verify the cookie if appropriate option is set. */
1152 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
1153 && cookie_len > 0) {
9ceb2426
MC		 1154 /* Get cookie */
1155 if (!PACKET_copy_bytes(&pkt, s->d1->rcvd_cookie,
1156 cookie_len)) {
1157 al = SSL_AD_DECODE_ERROR;
1158 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
1159 goto f_err;
1160 }
32ec4153
MC		 1161
1162 if (s->ctx->app_verify_cookie_cb != NULL) {
1163 if (s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1164 cookie_len) == 0) {
1165 al = SSL_AD_HANDSHAKE_FAILURE;
1166 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1167 SSL_R_COOKIE_MISMATCH);
1168 goto f_err;
1169 }
1170 /* else cookie verification succeeded */
1171 }
1172 /* default verification */
1173 else if (memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1174 s->d1->cookie_len) != 0) {
1175 al = SSL_AD_HANDSHAKE_FAILURE;
1176 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1177 goto f_err;
1178 }
1179 /* Set to -2 so if successful we return 2 */
1180 ret = -2;
9ceb2426
MC		 1181 } else {
1182 /* Skip over cookie */
1183 if (!PACKET_forward(&pkt, cookie_len)) {
1184 al = SSL_AD_DECODE_ERROR;
1185 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
1186 goto f_err;
1187 }
32ec4153
MC		 1188 }
1189
32ec4153
MC		 1190 if (s->method->version == DTLS_ANY_VERSION) {
1191 /* Select version to use */
1192 if (s->client_version <= DTLS1_2_VERSION &&
1193 !(s->options & SSL_OP_NO_DTLSv1_2)) {
1194 s->version = DTLS1_2_VERSION;
1195 s->method = DTLSv1_2_server_method();
1196 } else if (tls1_suiteb(s)) {
1197 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1198 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1199 s->version = s->client_version;
1200 al = SSL_AD_PROTOCOL_VERSION;
1201 goto f_err;
1202 } else if (s->client_version <= DTLS1_VERSION &&
1203 !(s->options & SSL_OP_NO_DTLSv1)) {
1204 s->version = DTLS1_VERSION;
1205 s->method = DTLSv1_server_method();
1206 } else {
1207 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1208 SSL_R_WRONG_VERSION_NUMBER);
1209 s->version = s->client_version;
1210 al = SSL_AD_PROTOCOL_VERSION;
1211 goto f_err;
1212 }
1213 s->session->ssl_version = s->version;
1214 }
0f113f3e 1215 }
0f113f3e 1216
9ceb2426 1217 if (!PACKET_get_net_2(&pkt, &cipherlen)) {
32ec4153
MC		 1218 al = SSL_AD_DECODE_ERROR;
1219 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
1220 goto f_err;
1221 }
3ae91cfb 1222
9ceb2426 1223 if (cipherlen == 0) {
32ec4153
MC		 1224 al = SSL_AD_ILLEGAL_PARAMETER;
1225 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_CIPHERS_SPECIFIED);
1226 goto f_err;
1227 }
5e9f0eeb 1228
9ceb2426 1229 if (!PACKET_get_bytes(&pkt, &cdata, cipherlen)) {
32ec4153
MC		 1230 /* not enough data */
1231 al = SSL_AD_DECODE_ERROR;
1232 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1233 goto f_err;
1234 }
9ceb2426
MC		 1235
1236 if (ssl_bytes_to_cipher_list(s, cdata, cipherlen, &(ciphers), 0) == NULL) {
32ec4153
MC		 1237 goto err;
1238 }
0f113f3e 1239
32ec4153
MC		 1240 /* If it is a hit, check that the cipher is in the list */
1241 if (s->hit) {
1242 j = 0;
1243 id = s->session->cipher->id;
d02b48c6 1244
413c4f45 1245#ifdef CIPHER_DEBUG
32ec4153
MC		 1246 fprintf(stderr, "client sent %d ciphers\n",
1247 sk_SSL_CIPHER_num(ciphers));
413c4f45 1248#endif
32ec4153
MC		 1249 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
1250 c = sk_SSL_CIPHER_value(ciphers, i);
413c4f45 1251#ifdef CIPHER_DEBUG
32ec4153
MC		 1252 fprintf(stderr, "client [%2d of %2d]:%s\n",
1253 i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c));
413c4f45 1254#endif
32ec4153
MC		 1255 if (c->id == id) {
1256 j = 1;
1257 break;
1258 }
0f113f3e 1259 }
0f113f3e 1260 /*
32ec4153
MC		 1261 * Disabled because it can be used in a ciphersuite downgrade
1262 * attack:
1263 * CVE-2010-4180.
0f113f3e 1264 */
32ec4153
MC		 1265#if 0
1266 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG)
1267 && (sk_SSL_CIPHER_num(ciphers) == 1)) {
1268 /*
1269 * Special case as client bug workaround: the previously used
1270 * cipher may not be in the current list, the client instead
1271 * might be trying to continue using a cipher that before wasn't
1272 * chosen due to server preferences. We'll have to reject the
1273 * connection if the cipher is not enabled, though.
1274 */
1275 c = sk_SSL_CIPHER_value(ciphers, 0);
1276 if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0) {
1277 s->session->cipher = c;
1278 j = 1;
1279 }
0f113f3e 1280 }
88f2a4cf 1281#endif
32ec4153
MC		 1282 if (j == 0) {
1283 /*
1284 * we need to have the cipher in the cipher list if we are asked
1285 * to reuse it
1286 */
1287 al = SSL_AD_ILLEGAL_PARAMETER;
1288 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1289 SSL_R_REQUIRED_CIPHER_MISSING);
1290 goto f_err;
1291 }
0f113f3e 1292 }
0f113f3e 1293
32ec4153 1294 /* compression */
9ceb2426
MC		 1295 if (!PACKET_get_1(&pkt, &complen)
1296 || !PACKET_get_bytes(&pkt, &cdata, complen)) {
32ec4153
MC		 1297 /* not enough data */
1298 al = SSL_AD_DECODE_ERROR;
1299 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
1300 goto f_err;
1301 }
9ceb2426 1302
a4c4a7d5 1303#ifndef OPENSSL_NO_COMP
9ceb2426 1304 q = cdata;
a4c4a7d5 1305#endif
b2ce0337 1306 for (j = 0; j < complen; j++) {
9ceb2426 1307 if (cdata[j] == 0)
32ec4153
MC		 1308 break;
1309 }
0f113f3e 1310
b2ce0337 1311 if (j >= complen) {
32ec4153
MC		 1312 /* no compress */
1313 al = SSL_AD_DECODE_ERROR;
1314 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED);
1315 goto f_err;
1316 }
0f113f3e 1317 }
32ec4153 1318
0f113f3e
MC		 1319 /* TLS extensions */
1320 if (s->version >= SSL3_VERSION) {
9ceb2426 1321 if (!ssl_parse_clienthello_tlsext(s, &pkt)) {
0f113f3e
MC		 1322 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_PARSE_TLSEXT);
1323 goto err;
1324 }
1325 }
1326
1327 /*
1328 * Check if we want to use external pre-shared secret for this handshake
1329 * for not reused session only. We need to generate server_random before
1330 * calling tls_session_secret_cb in order to allow SessionTicket
1331 * processing to use it in key derivation.
1332 */
1333 {
1334 unsigned char *pos;
1335 pos = s->s3->server_random;
1336 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) {
1337 goto f_err;
1338 }
1339 }
1340
1341 if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) {
1342 SSL_CIPHER *pref_cipher = NULL;
1343
1344 s->session->master_key_length = sizeof(s->session->master_key);
1345 if (s->tls_session_secret_cb(s, s->session->master_key,
1346 &s->session->master_key_length, ciphers,
1347 &pref_cipher,
1348 s->tls_session_secret_cb_arg)) {
1349 s->hit = 1;
1350 s->session->ciphers = ciphers;
1351 s->session->verify_result = X509_V_OK;
1352
1353 ciphers = NULL;
1354
1355 /* check if some cipher was preferred by call back */
1356 pref_cipher =
1357 pref_cipher ? pref_cipher : ssl3_choose_cipher(s,
1358 s->
1359 session->ciphers,
1360 SSL_get_ciphers
1361 (s));
1362 if (pref_cipher == NULL) {
1363 al = SSL_AD_HANDSHAKE_FAILURE;
1364 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
1365 goto f_err;
1366 }
1367
1368 s->session->cipher = pref_cipher;
25aaa98a 1369 sk_SSL_CIPHER_free(s->cipher_list);
0f113f3e 1370 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
25aaa98a 1371 sk_SSL_CIPHER_free(s->cipher_list_by_id);
0f113f3e
MC		 1372 s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1373 }
1374 }
58ece833 1375
0f113f3e
MC		 1376 /*
1377 * Worst case, we will use the NULL compression, but if we have other
b2ce0337 1378 * options, we will now look for them. We have complen-1 compression
0f113f3e
MC		 1379 * algorithms from the client, starting at q.
1380 */
1381 s->s3->tmp.new_compression = NULL;
09b6c2ef 1382#ifndef OPENSSL_NO_COMP
0f113f3e
MC		 1383 /* This only happens if we have a cache hit */
1384 if (s->session->compress_meth != 0) {
1385 int m, comp_id = s->session->compress_meth;
9ceb2426 1386 unsigned int k;
0f113f3e
MC		 1387 /* Perform sanity checks on resumed compression algorithm */
1388 /* Can't disable compression */
1389 if (!ssl_allow_compression(s)) {
1390 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1391 SSL_R_INCONSISTENT_COMPRESSION);
1392 goto f_err;
1393 }
1394 /* Look for resumed compression method */
1395 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) {
1396 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
1397 if (comp_id == comp->id) {
1398 s->s3->tmp.new_compression = comp;
1399 break;
1400 }
1401 }
1402 if (s->s3->tmp.new_compression == NULL) {
1403 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1404 SSL_R_INVALID_COMPRESSION_ALGORITHM);
1405 goto f_err;
1406 }
1407 /* Look for resumed method in compression list */
9ceb2426
MC		 1408 for (k = 0; k < complen; k++) {
1409 if (q[k] == comp_id)
0f113f3e
MC		 1410 break;
1411 }
9ceb2426 1412 if (k >= complen) {
0f113f3e
MC		 1413 al = SSL_AD_ILLEGAL_PARAMETER;
1414 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1415 SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1416 goto f_err;
1417 }
1418 } else if (s->hit)
1419 comp = NULL;
1420 else if (ssl_allow_compression(s) && s->ctx->comp_methods) {
df6741c9 1421 /* See if we have a match */
9ceb2426
MC		 1422 int m, nn, v, done = 0;
1423 unsigned int o;
0f113f3e
MC		 1424
1425 nn = sk_SSL_COMP_num(s->ctx->comp_methods);
1426 for (m = 0; m < nn; m++) {
1427 comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
1428 v = comp->id;
b2ce0337 1429 for (o = 0; o < complen; o++) {
0f113f3e
MC		 1430 if (v == q[o]) {
1431 done = 1;
1432 break;
1433 }
1434 }
1435 if (done)
1436 break;
1437 }
1438 if (done)
1439 s->s3->tmp.new_compression = comp;
1440 else
1441 comp = NULL;
1442 }
e6f418bc 1443#else
0f113f3e
MC		 1444 /*
1445 * If compression is disabled we'd better not try to resume a session
1446 * using compression.
1447 */
1448 if (s->session->compress_meth != 0) {
1449 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
1450 goto f_err;
1451 }
09b6c2ef 1452#endif
413c4f45 1453
0f113f3e
MC		 1454 /*
1455 * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher
1456 */
d02b48c6 1457
0f113f3e 1458 if (!s->hit) {
09b6c2ef 1459#ifdef OPENSSL_NO_COMP
0f113f3e 1460 s->session->compress_meth = 0;
09b6c2ef 1461#else
0f113f3e 1462 s->session->compress_meth = (comp == NULL) ? 0 : comp->id;
09b6c2ef 1463#endif
25aaa98a 1464 sk_SSL_CIPHER_free(s->session->ciphers);
0f113f3e
MC		 1465 s->session->ciphers = ciphers;
1466 if (ciphers == NULL) {
3ae91cfb
EK		 1467 al = SSL_AD_INTERNAL_ERROR;
1468 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
0f113f3e
MC		 1469 goto f_err;
1470 }
1471 ciphers = NULL;
1472 if (!tls1_set_server_sigalgs(s)) {
1473 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1474 goto err;
1475 }
1476 /* Let cert callback update server certificates if required */
1477 retry_cert:
1478 if (s->cert->cert_cb) {
1479 int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1480 if (rv == 0) {
1481 al = SSL_AD_INTERNAL_ERROR;
1482 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CERT_CB_ERROR);
1483 goto f_err;
1484 }
1485 if (rv < 0) {
1486 s->rwstate = SSL_X509_LOOKUP;
1487 return -1;
1488 }
1489 s->rwstate = SSL_NOTHING;
1490 }
1491 c = ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1492
1493 if (c == NULL) {
1494 al = SSL_AD_HANDSHAKE_FAILURE;
1495 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
1496 goto f_err;
1497 }
1498 s->s3->tmp.new_cipher = c;
1499 /* check whether we should disable session resumption */
1500 if (s->not_resumable_session_cb != NULL)
1501 s->session->not_resumable = s->not_resumable_session_cb(s,
1502 ((c->algorithm_mkey & (SSL_kDHE | SSL_kECDHE))
1503 != 0));
1504 if (s->session->not_resumable)
1505 /* do not send a session ticket */
1506 s->tlsext_ticket_expected = 0;
1507 } else {
1508 /* Session-id reuse */
7a4dadc3 1509 s->s3->tmp.new_cipher = s->session->cipher;
0f113f3e
MC		 1510 }
1511
1512 if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER)) {
124037fd 1513 if (!ssl3_digest_cached_records(s, 0))
0f113f3e
MC		 1514 goto f_err;
1515 }
1516
50e735f9
MC		 1517 /*-
1518 * we now have the following setup.
1519 * client_random
1520 * cipher_list - our prefered list of ciphers
1521 * ciphers - the clients prefered list of ciphers
1522 * compression - basically ignored right now
1523 * ssl version is set - sslv3
1524 * s->session - The ssl session has been setup.
1525 * s->hit - session reuse flag
1526 * s->s3->tmp.new_cipher- the new cipher to use.
1527 */
0f113f3e
MC		 1528
1529 /* Handles TLS extensions that we couldn't check earlier */
1530 if (s->version >= SSL3_VERSION) {
1531 if (ssl_check_clienthello_tlsext_late(s) <= 0) {
1532 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1533 goto err;
1534 }
1535 }
1536
1537 if (ret < 0)
1538 ret = -ret;
1539 if (0) {
1540 f_err:
1541 ssl3_send_alert(s, SSL3_AL_FATAL, al);
0f113f3e 1542 err:
a89db885
MC		 1543 s->state = SSL_ST_ERR;
1544 }
1545
25aaa98a 1546 sk_SSL_CIPHER_free(ciphers);
0f113f3e
MC		 1547 return ret < 0 ? -1 : ret;
1548}
d02b48c6 1549
36d16f8e 1550int ssl3_send_server_hello(SSL *s)
0f113f3e
MC		 1551{
1552 unsigned char *buf;
1553 unsigned char *p, *d;
1554 int i, sl;
1555 int al = 0;
1556 unsigned long l;
1557
1558 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) {
1559 buf = (unsigned char *)s->init_buf->data;
e481f9b9 1560
0f113f3e
MC		 1561 /* Do the message type and length last */
1562 d = p = ssl_handshake_start(s);
1563
1564 *(p++) = s->version >> 8;
1565 *(p++) = s->version & 0xff;
1566
e1e088ec
MC		 1567 /*
1568 * Random stuff. Filling of the server_random takes place in
1569 * ssl3_get_client_hello()
1570 */
0f113f3e
MC		 1571 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
1572 p += SSL3_RANDOM_SIZE;
1573
50e735f9
MC		 1574 /*-
1575 * There are several cases for the session ID to send
1576 * back in the server hello:
1577 * - For session reuse from the session cache,
1578 * we send back the old session ID.
1579 * - If stateless session reuse (using a session ticket)
1580 * is successful, we send back the client's "session ID"
1581 * (which doesn't actually identify the session).
1582 * - If it is a new session, we send back the new
1583 * session ID.
1584 * - However, if we want the new session to be single-use,
1585 * we send back a 0-length session ID.
1586 * s->hit is non-zero in either case of session reuse,
1587 * so the following won't overwrite an ID that we're supposed
1588 * to send back.
1589 */
0f113f3e
MC		 1590 if (s->session->not_resumable ||
1591 (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1592 && !s->hit))
1593 s->session->session_id_length = 0;
1594
1595 sl = s->session->session_id_length;
1596 if (sl > (int)sizeof(s->session->session_id)) {
1597 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
cf9b0b6f 1598 s->state = SSL_ST_ERR;
0f113f3e
MC		 1599 return -1;
1600 }
1601 *(p++) = sl;
1602 memcpy(p, s->session->session_id, sl);
1603 p += sl;
1604
1605 /* put the cipher */
1606 i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
1607 p += i;
1608
1609 /* put the compression method */
09b6c2ef 1610#ifdef OPENSSL_NO_COMP
0f113f3e 1611 *(p++) = 0;
09b6c2ef 1612#else
0f113f3e
MC		 1613 if (s->s3->tmp.new_compression == NULL)
1614 *(p++) = 0;
1615 else
1616 *(p++) = s->s3->tmp.new_compression->id;
09b6c2ef 1617#endif
e481f9b9 1618
0f113f3e
MC		 1619 if (ssl_prepare_serverhello_tlsext(s) <= 0) {
1620 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
cf9b0b6f 1621 s->state = SSL_ST_ERR;
0f113f3e
MC		 1622 return -1;
1623 }
1624 if ((p =
1625 ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
1626 &al)) == NULL) {
1627 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1628 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
cf9b0b6f 1629 s->state = SSL_ST_ERR;
0f113f3e
MC		 1630 return -1;
1631 }
e481f9b9 1632
0f113f3e
MC		 1633 /* do the header */
1634 l = (p - d);
61986d32 1635 if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) {
77d514c5
MC		 1636 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1637 return -1;
1638 }
0f113f3e
MC		 1639 s->state = SSL3_ST_SW_SRVR_HELLO_B;
1640 }
d02b48c6 1641
0f113f3e
MC		 1642 /* SSL3_ST_SW_SRVR_HELLO_B */
1643 return ssl_do_write(s);
1644}
d02b48c6 1645
36d16f8e 1646int ssl3_send_server_done(SSL *s)
0f113f3e 1647{
d02b48c6 1648
0f113f3e 1649 if (s->state == SSL3_ST_SW_SRVR_DONE_A) {
61986d32 1650 if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) {
77d514c5
MC		 1651 SSLerr(SSL_F_SSL3_SEND_SERVER_DONE, ERR_R_INTERNAL_ERROR);
1652 return -1;
1653 }
0f113f3e
MC		 1654 s->state = SSL3_ST_SW_SRVR_DONE_B;
1655 }
d02b48c6 1656
0f113f3e
MC		 1657 /* SSL3_ST_SW_SRVR_DONE_B */
1658 return ssl_do_write(s);
1659}
d02b48c6 1660
36d16f8e 1661int ssl3_send_server_key_exchange(SSL *s)
0f113f3e 1662{
bc36ee62 1663#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 1664 unsigned char *q;
1665 int j, num;
1666 RSA *rsa;
1667 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1668 unsigned int u;
d02b48c6 1669#endif
bc36ee62 1670#ifndef OPENSSL_NO_DH
0f113f3e 1671 DH *dh = NULL, *dhp;
ea262260 1672#endif
10bf4fc2 1673#ifndef OPENSSL_NO_EC
0f113f3e
MC		 1674 EC_KEY *ecdh = NULL, *ecdhp;
1675 unsigned char *encodedPoint = NULL;
1676 int encodedlen = 0;
1677 int curve_id = 0;
1678 BN_CTX *bn_ctx = NULL;
d02b48c6 1679#endif
0f113f3e
MC		 1680 EVP_PKEY *pkey;
1681 const EVP_MD *md = NULL;
1682 unsigned char *p, *d;
1683 int al, i;
1684 unsigned long type;
1685 int n;
1686 CERT *cert;
1687 BIGNUM *r[4];
1688 int nr[4], kn;
1689 BUF_MEM *buf;
1690 EVP_MD_CTX md_ctx;
1691
1692 EVP_MD_CTX_init(&md_ctx);
1693 if (s->state == SSL3_ST_SW_KEY_EXCH_A) {
1694 type = s->s3->tmp.new_cipher->algorithm_mkey;
1695 cert = s->cert;
1696
1697 buf = s->init_buf;
1698
1699 r[0] = r[1] = r[2] = r[3] = NULL;
1700 n = 0;
85269210
DSH		 1701#ifndef OPENSSL_NO_PSK
1702 if (type & SSL_PSK) {
1703 /*
1704 * reserve size for record length and PSK identity hint
1705 */
1706 n += 2;
1707 if (s->ctx->psk_identity_hint)
1708 n += strlen(s->ctx->psk_identity_hint);
1709 }
1710 /* Plain PSK or RSAPSK nothing to do */
1711 if (type & (SSL_kPSK | SSL_kRSAPSK)) {
1712 } else
1713#endif /* !OPENSSL_NO_PSK */
bc36ee62 1714#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 1715 if (type & SSL_kRSA) {
1716 rsa = cert->rsa_tmp;
1717 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) {
1718 rsa = s->cert->rsa_tmp_cb(s,
1719 SSL_C_IS_EXPORT(s->s3->
1720 tmp.new_cipher),
1721 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1722 tmp.new_cipher));
1723 if (rsa == NULL) {
1724 al = SSL_AD_HANDSHAKE_FAILURE;
1725 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1726 SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1727 goto f_err;
1728 }
1729 RSA_up_ref(rsa);
1730 cert->rsa_tmp = rsa;
1731 }
1732 if (rsa == NULL) {
1733 al = SSL_AD_HANDSHAKE_FAILURE;
1734 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1735 SSL_R_MISSING_TMP_RSA_KEY);
1736 goto f_err;
1737 }
1738 r[0] = rsa->n;
1739 r[1] = rsa->e;
1740 s->s3->tmp.use_rsa_tmp = 1;
1741 } else
d02b48c6 1742#endif
bc36ee62 1743#ifndef OPENSSL_NO_DH
85269210 1744 if (type & (SSL_kDHE | SSL_kDHEPSK)) {
0f113f3e
MC		 1745 if (s->cert->dh_tmp_auto) {
1746 dhp = ssl_get_auto_dh(s);
1747 if (dhp == NULL) {
1748 al = SSL_AD_INTERNAL_ERROR;
1749 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1750 ERR_R_INTERNAL_ERROR);
1751 goto f_err;
1752 }
1753 } else
1754 dhp = cert->dh_tmp;
1755 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1756 dhp = s->cert->dh_tmp_cb(s,
1757 SSL_C_IS_EXPORT(s->s3->
1758 tmp.new_cipher),
1759 SSL_C_EXPORT_PKEYLENGTH(s->s3->
1760 tmp.new_cipher));
1761 if (dhp == NULL) {
1762 al = SSL_AD_HANDSHAKE_FAILURE;
1763 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1764 SSL_R_MISSING_TMP_DH_KEY);
1765 goto f_err;
1766 }
1767 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1768 DH_security_bits(dhp), 0, dhp)) {
1769 al = SSL_AD_HANDSHAKE_FAILURE;
1770 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1771 SSL_R_DH_KEY_TOO_SMALL);
1772 goto f_err;
1773 }
1774 if (s->s3->tmp.dh != NULL) {
1775 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1776 ERR_R_INTERNAL_ERROR);
1777 goto err;
1778 }
1779
1780 if (s->cert->dh_tmp_auto)
1781 dh = dhp;
1782 else if ((dh = DHparams_dup(dhp)) == NULL) {
1783 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
1784 goto err;
1785 }
1786
1787 s->s3->tmp.dh = dh;
1788 if ((dhp->pub_key == NULL ||
1789 dhp->priv_key == NULL ||
1790 (s->options & SSL_OP_SINGLE_DH_USE))) {
1791 if (!DH_generate_key(dh)) {
1792 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
1793 goto err;
1794 }
1795 } else {
1796 dh->pub_key = BN_dup(dhp->pub_key);
1797 dh->priv_key = BN_dup(dhp->priv_key);
1798 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) {
1799 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB);
1800 goto err;
1801 }
1802 }
1803 r[0] = dh->p;
1804 r[1] = dh->g;
1805 r[2] = dh->pub_key;
1806 } else
d02b48c6 1807#endif
10bf4fc2 1808#ifndef OPENSSL_NO_EC
85269210 1809 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
0f113f3e
MC		 1810 const EC_GROUP *group;
1811
1812 ecdhp = cert->ecdh_tmp;
1813 if (s->cert->ecdh_tmp_auto) {
1814 /* Get NID of appropriate shared curve */
1815 int nid = tls1_shared_curve(s, -2);
1816 if (nid != NID_undef)
1817 ecdhp = EC_KEY_new_by_curve_name(nid);
1818 } else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb) {
1819 ecdhp = s->cert->ecdh_tmp_cb(s,
1820 SSL_C_IS_EXPORT(s->s3->
1821 tmp.new_cipher),
1822 SSL_C_EXPORT_PKEYLENGTH(s->
1823 s3->tmp.new_cipher));
1824 }
1825 if (ecdhp == NULL) {
1826 al = SSL_AD_HANDSHAKE_FAILURE;
1827 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1828 SSL_R_MISSING_TMP_ECDH_KEY);
1829 goto f_err;
1830 }
1831
1832 if (s->s3->tmp.ecdh != NULL) {
1833 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1834 ERR_R_INTERNAL_ERROR);
1835 goto err;
1836 }
1837
1838 /* Duplicate the ECDH structure. */
1839 if (ecdhp == NULL) {
1840 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1841 goto err;
1842 }
1843 if (s->cert->ecdh_tmp_auto)
1844 ecdh = ecdhp;
1845 else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) {
1846 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1847 goto err;
1848 }
1849
1850 s->s3->tmp.ecdh = ecdh;
1851 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1852 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1853 (s->options & SSL_OP_SINGLE_ECDH_USE)) {
1854 if (!EC_KEY_generate_key(ecdh)) {
1855 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1856 ERR_R_ECDH_LIB);
1857 goto err;
1858 }
1859 }
1860
1861 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1862 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1863 (EC_KEY_get0_private_key(ecdh) == NULL)) {
1864 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1865 goto err;
1866 }
1867
1868 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1869 (EC_GROUP_get_degree(group) > 163)) {
1870 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1871 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1872 goto err;
1873 }
1874
1875 /*
1876 * XXX: For now, we only support ephemeral ECDH keys over named
1877 * (not generic) curves. For supported named curves, curve_id is
1878 * non-zero.
1879 */
1880 if ((curve_id =
1881 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1882 == 0) {
1883 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1884 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1885 goto err;
1886 }
1887
1888 /*
1889 * Encode the public key. First check the size of encoding and
1890 * allocate memory accordingly.
1891 */
1892 encodedlen = EC_POINT_point2oct(group,
1893 EC_KEY_get0_public_key(ecdh),
1894 POINT_CONVERSION_UNCOMPRESSED,
1895 NULL, 0, NULL);
1896
1897 encodedPoint = (unsigned char *)
1898 OPENSSL_malloc(encodedlen * sizeof(unsigned char));
1899 bn_ctx = BN_CTX_new();
1900 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
1901 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1902 ERR_R_MALLOC_FAILURE);
1903 goto err;
1904 }
1905
1906 encodedlen = EC_POINT_point2oct(group,
1907 EC_KEY_get0_public_key(ecdh),
1908 POINT_CONVERSION_UNCOMPRESSED,
1909 encodedPoint, encodedlen, bn_ctx);
1910
1911 if (encodedlen == 0) {
1912 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1913 goto err;
1914 }
1915
1916 BN_CTX_free(bn_ctx);
1917 bn_ctx = NULL;
1918
1919 /*
1920 * XXX: For now, we only support named (not generic) curves in
1921 * ECDH ephemeral key exchanges. In this situation, we need four
1922 * additional bytes to encode the entire ServerECDHParams
1923 * structure.
1924 */
85269210 1925 n += 4 + encodedlen;
0f113f3e
MC		 1926
1927 /*
1928 * We'll generate the serverKeyExchange message explicitly so we
1929 * can set these to NULLs
1930 */
1931 r[0] = NULL;
1932 r[1] = NULL;
1933 r[2] = NULL;
1934 r[3] = NULL;
1935 } else
10bf4fc2 1936#endif /* !OPENSSL_NO_EC */
edc032b5 1937#ifndef OPENSSL_NO_SRP
0f113f3e
MC		 1938 if (type & SSL_kSRP) {
1939 if ((s->srp_ctx.N == NULL) ||
1940 (s->srp_ctx.g == NULL) ||
1941 (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) {
1942 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1943 SSL_R_MISSING_SRP_PARAM);
1944 goto err;
1945 }
1946 r[0] = s->srp_ctx.N;
1947 r[1] = s->srp_ctx.g;
1948 r[2] = s->srp_ctx.s;
1949 r[3] = s->srp_ctx.B;
1950 } else
edc032b5 1951#endif
0f113f3e
MC		 1952 {
1953 al = SSL_AD_HANDSHAKE_FAILURE;
1954 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1955 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1956 goto f_err;
1957 }
1958 for (i = 0; i < 4 && r[i] != NULL; i++) {
1959 nr[i] = BN_num_bytes(r[i]);
edc032b5 1960#ifndef OPENSSL_NO_SRP
0f113f3e
MC		 1961 if ((i == 2) && (type & SSL_kSRP))
1962 n += 1 + nr[i];
1963 else
edc032b5 1964#endif
0f113f3e
MC		 1965 n += 2 + nr[i];
1966 }
1967
85269210
DSH		 1968 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1969 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) {
0f113f3e
MC		 1970 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md))
1971 == NULL) {
1972 al = SSL_AD_DECODE_ERROR;
1973 goto f_err;
1974 }
1975 kn = EVP_PKEY_size(pkey);
1976 } else {
1977 pkey = NULL;
1978 kn = 0;
1979 }
1980
1981 if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) {
1982 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
1983 goto err;
1984 }
1985 d = p = ssl_handshake_start(s);
1986
85269210
DSH		 1987#ifndef OPENSSL_NO_PSK
1988 if (type & SSL_PSK) {
1989 /* copy PSK identity hint */
1990 if (s->ctx->psk_identity_hint) {
1991 s2n(strlen(s->ctx->psk_identity_hint), p);
1992 strncpy((char *)p, s->ctx->psk_identity_hint,
1993 strlen(s->ctx->psk_identity_hint));
1994 p += strlen(s->ctx->psk_identity_hint);
1995 } else {
1996 s2n(0, p);
1997 }
1998 }
1999#endif
2000
0f113f3e 2001 for (i = 0; i < 4 && r[i] != NULL; i++) {
edc032b5 2002#ifndef OPENSSL_NO_SRP
0f113f3e
MC		 2003 if ((i == 2) && (type & SSL_kSRP)) {
2004 *p = nr[i];
2005 p++;
2006 } else
edc032b5 2007#endif
0f113f3e
MC		 2008 s2n(nr[i], p);
2009 BN_bn2bin(r[i], p);
2010 p += nr[i];
2011 }
d02b48c6 2012
10bf4fc2 2013#ifndef OPENSSL_NO_EC
85269210 2014 if (type & (SSL_kECDHE | SSL_kECDHEPSK)) {
0f113f3e
MC		 2015 /*
2016 * XXX: For now, we only support named (not generic) curves. In
2017 * this situation, the serverKeyExchange message has: [1 byte
2018 * CurveType], [2 byte CurveName] [1 byte length of encoded
2019 * point], followed by the actual encoded point itself
2020 */
2021 *p = NAMED_CURVE_TYPE;
2022 p += 1;
2023 *p = 0;
2024 p += 1;
2025 *p = curve_id;
2026 p += 1;
2027 *p = encodedlen;
2028 p += 1;
16f8d4eb 2029 memcpy(p, encodedPoint, encodedlen);
0f113f3e
MC		 2030 OPENSSL_free(encodedPoint);
2031 encodedPoint = NULL;
2032 p += encodedlen;
2033 }
ea262260
BM		 2034#endif
2035
0f113f3e
MC		 2036 /* not anonymous */
2037 if (pkey != NULL) {
2038 /*
2039 * n is the length of the params, they start at &(d[4]) and p
2040 * points to the space at the end.
2041 */
bc36ee62 2042#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 2043 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
2044 q = md_buf;
2045 j = 0;
2046 for (num = 2; num > 0; num--) {
2047 EVP_MD_CTX_set_flags(&md_ctx,
2048 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
2049 EVP_DigestInit_ex(&md_ctx, (num == 2)
2050 ? s->ctx->md5 : s->ctx->sha1, NULL);
2051 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
2052 SSL3_RANDOM_SIZE);
2053 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
2054 SSL3_RANDOM_SIZE);
2055 EVP_DigestUpdate(&md_ctx, d, n);
2056 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i);
2057 q += i;
2058 j += i;
2059 }
2060 if (RSA_sign(NID_md5_sha1, md_buf, j,
2061 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
2062 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA);
2063 goto err;
2064 }
2065 s2n(u, p);
2066 n += u + 2;
2067 } else
d02b48c6 2068#endif
0f113f3e
MC		 2069 if (md) {
2070 /* send signature algorithm */
2071 if (SSL_USE_SIGALGS(s)) {
2072 if (!tls12_get_sigandhash(p, pkey, md)) {
2073 /* Should never happen */
2074 al = SSL_AD_INTERNAL_ERROR;
2075 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
2076 ERR_R_INTERNAL_ERROR);
2077 goto f_err;
2078 }
2079 p += 2;
2080 }
a2f9200f 2081#ifdef SSL_DEBUG
0f113f3e 2082 fprintf(stderr, "Using hash %s\n", EVP_MD_name(md));
a2f9200f 2083#endif
0f113f3e
MC		 2084 EVP_SignInit_ex(&md_ctx, md, NULL);
2085 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]),
2086 SSL3_RANDOM_SIZE);
2087 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]),
2088 SSL3_RANDOM_SIZE);
2089 EVP_SignUpdate(&md_ctx, d, n);
2090 if (!EVP_SignFinal(&md_ctx, &(p[2]),
2091 (unsigned int *)&i, pkey)) {
2092 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_EVP);
2093 goto err;
2094 }
2095 s2n(i, p);
2096 n += i + 2;
2097 if (SSL_USE_SIGALGS(s))
2098 n += 2;
2099 } else {
2100 /* Is this error check actually needed? */
2101 al = SSL_AD_HANDSHAKE_FAILURE;
2102 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
2103 SSL_R_UNKNOWN_PKEY_TYPE);
2104 goto f_err;
2105 }
2106 }
2107
61986d32 2108 if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) {
77d514c5
MC		 2109 al = SSL_AD_HANDSHAKE_FAILURE;
2110 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2111 goto f_err;
2112 }
0f113f3e
MC		 2113 }
2114
2115 s->state = SSL3_ST_SW_KEY_EXCH_B;
2116 EVP_MD_CTX_cleanup(&md_ctx);
2117 return ssl_do_write(s);
2118 f_err:
2119 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2120 err:
556efe79 2121#ifndef OPENSSL_NO_EC
b548a1f1 2122 OPENSSL_free(encodedPoint);
0f113f3e 2123 BN_CTX_free(bn_ctx);
ea262260 2124#endif
0f113f3e 2125 EVP_MD_CTX_cleanup(&md_ctx);
cf9b0b6f 2126 s->state = SSL_ST_ERR;
0f113f3e
MC		 2127 return (-1);
2128}
d02b48c6 2129
36d16f8e 2130int ssl3_send_certificate_request(SSL *s)
0f113f3e
MC		 2131{
2132 unsigned char *p, *d;
2133 int i, j, nl, off, n;
2134 STACK_OF(X509_NAME) *sk = NULL;
2135 X509_NAME *name;
2136 BUF_MEM *buf;
2137
2138 if (s->state == SSL3_ST_SW_CERT_REQ_A) {
2139 buf = s->init_buf;
2140
2141 d = p = ssl_handshake_start(s);
2142
2143 /* get the list of acceptable cert types */
2144 p++;
2145 n = ssl3_get_req_cert_type(s, p);
2146 d[0] = n;
2147 p += n;
2148 n++;
2149
2150 if (SSL_USE_SIGALGS(s)) {
2151 const unsigned char *psigs;
2152 unsigned char *etmp = p;
2153 nl = tls12_get_psigalgs(s, &psigs);
2154 /* Skip over length for now */
2155 p += 2;
2156 nl = tls12_copy_sigalgs(s, p, psigs, nl);
2157 /* Now fill in length */
2158 s2n(nl, etmp);
2159 p += nl;
2160 n += nl + 2;
2161 }
2162
2163 off = n;
2164 p += 2;
2165 n += 2;
2166
2167 sk = SSL_get_client_CA_list(s);
2168 nl = 0;
2169 if (sk != NULL) {
2170 for (i = 0; i < sk_X509_NAME_num(sk); i++) {
2171 name = sk_X509_NAME_value(sk, i);
2172 j = i2d_X509_NAME(name, NULL);
2173 if (!BUF_MEM_grow_clean
2174 (buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) {
2175 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,
2176 ERR_R_BUF_LIB);
2177 goto err;
2178 }
2179 p = ssl_handshake_start(s) + n;
3c33c6f6
MC		 2180 s2n(j, p);
2181 i2d_X509_NAME(name, &p);
2182 n += 2 + j;
2183 nl += 2 + j;
0f113f3e
MC		 2184 }
2185 }
2186 /* else no CA names */
2187 p = ssl_handshake_start(s) + off;
2188 s2n(nl, p);
2189
61986d32 2190 if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) {
77d514c5
MC		 2191 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
2192 return -1;
2193 }
d02b48c6 2194
0f113f3e
MC		 2195 s->state = SSL3_ST_SW_CERT_REQ_B;
2196 }
d02b48c6 2197
0f113f3e
MC		 2198 /* SSL3_ST_SW_CERT_REQ_B */
2199 return ssl_do_write(s);
2200 err:
cf9b0b6f 2201 s->state = SSL_ST_ERR;
0f113f3e
MC		 2202 return (-1);
2203}
d02b48c6 2204
36d16f8e 2205int ssl3_get_client_key_exchange(SSL *s)
0f113f3e
MC		 2206{
2207 int i, al, ok;
2208 long n;
2209 unsigned long alg_k;
2210 unsigned char *p;
bc36ee62 2211#ifndef OPENSSL_NO_RSA
0f113f3e
MC		 2212 RSA *rsa = NULL;
2213 EVP_PKEY *pkey = NULL;
79df9d62 2214#endif
bc36ee62 2215#ifndef OPENSSL_NO_DH
0f113f3e
MC		 2216 BIGNUM *pub = NULL;
2217 DH *dh_srvr, *dh_clnt = NULL;
58964a49 2218#endif
556efe79 2219#ifndef OPENSSL_NO_EC
0f113f3e
MC		 2220 EC_KEY *srvr_ecdh = NULL;
2221 EVP_PKEY *clnt_pub_pkey = NULL;
2222 EC_POINT *clnt_ecpoint = NULL;
2223 BN_CTX *bn_ctx = NULL;
ea262260
BM		 2224#endif
2225
0f113f3e
MC		 2226 n = s->method->ssl_get_message(s,
2227 SSL3_ST_SR_KEY_EXCH_A,
2228 SSL3_ST_SR_KEY_EXCH_B,
2229 SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok);
d02b48c6 2230
0f113f3e
MC		 2231 if (!ok)
2232 return ((int)n);
2233 p = (unsigned char *)s->init_msg;
d02b48c6 2234
0f113f3e 2235 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
d02b48c6 2236
85269210
DSH		 2237#ifndef OPENSSL_NO_PSK
2238 /* For PSK parse and retrieve identity, obtain PSK key */
2239 if (alg_k & SSL_PSK) {
2240 unsigned char psk[PSK_MAX_PSK_LEN];
2241 size_t psklen;
2242 if (n < 2) {
2243 al = SSL_AD_DECODE_ERROR;
2244 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH);
2245 goto f_err;
2246 }
2247 n2s(p, i);
2248 if (i + 2 > n) {
2249 al = SSL_AD_DECODE_ERROR;
2250 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH);
2251 goto f_err;
2252 }
2253 if (i > PSK_MAX_IDENTITY_LEN) {
2254 al = SSL_AD_DECODE_ERROR;
2255 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2256 SSL_R_DATA_LENGTH_TOO_LONG);
2257 goto f_err;
2258 }
2259 if (s->psk_server_callback == NULL) {
2260 al = SSL_AD_INTERNAL_ERROR;
2261 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2262 SSL_R_PSK_NO_SERVER_CB);
2263 goto f_err;
2264 }
2265
2266 OPENSSL_free(s->session->psk_identity);
2267 s->session->psk_identity = BUF_strndup((char *)p, i);
2268
2269 if (s->session->psk_identity == NULL) {
2270 al = SSL_AD_INTERNAL_ERROR;
2271 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2272 ERR_R_MALLOC_FAILURE);
2273 goto f_err;
2274 }
2275
2276 psklen = s->psk_server_callback(s, s->session->psk_identity,
2277 psk, sizeof(psk));
2278
2279 if (psklen > PSK_MAX_PSK_LEN) {
2280 al = SSL_AD_INTERNAL_ERROR;
2281 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2282 goto f_err;
2283 } else if (psklen == 0) {
2284 /*
2285 * PSK related to the given identity not found
2286 */
2287 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2288 SSL_R_PSK_IDENTITY_NOT_FOUND);
2289 al = SSL_AD_UNKNOWN_PSK_IDENTITY;
2290 goto f_err;
2291 }
2292
2293 OPENSSL_free(s->s3->tmp.psk);
2294 s->s3->tmp.psk = BUF_memdup(psk, psklen);
2295 OPENSSL_cleanse(psk, psklen);
2296
2297 if (s->s3->tmp.psk == NULL) {
2298 al = SSL_AD_INTERNAL_ERROR;
2299 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
2300 goto f_err;
2301 }
2302
2303 s->s3->tmp.psklen = psklen;
2304
2305 n -= i + 2;
2306 p += i;
2307 }
2308 if (alg_k & SSL_kPSK) {
2309 /* Identity extracted earlier: should be nothing left */
2310 if (n != 0) {
2311 al = SSL_AD_HANDSHAKE_FAILURE;
2312 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH);
2313 goto f_err;
2314 }
2315 /* PSK handled by ssl_generate_master_secret */
2316 if (!ssl_generate_master_secret(s, NULL, 0, 0)) {
2317 al = SSL_AD_INTERNAL_ERROR;
2318 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2319 goto f_err;
2320 }
2321 } else
2322#endif
bc36ee62 2323#ifndef OPENSSL_NO_RSA
85269210 2324 if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
0f113f3e
MC		 2325 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2326 int decrypt_len;
2327 unsigned char decrypt_good, version_good;
2328 size_t j;
2329
2330 /* FIX THIS UP EAY EAY EAY EAY */
2331 if (s->s3->tmp.use_rsa_tmp) {
2332 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2333 rsa = s->cert->rsa_tmp;
2334 /*
2335 * Don't do a callback because rsa_tmp should be sent already
2336 */
2337 if (rsa == NULL) {
2338 al = SSL_AD_HANDSHAKE_FAILURE;
2339 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2340 SSL_R_MISSING_TMP_RSA_PKEY);
2341 goto f_err;
2342
2343 }
2344 } else {
2345 pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2346 if ((pkey == NULL) ||
2347 (pkey->type != EVP_PKEY_RSA) || (pkey->pkey.rsa == NULL)) {
2348 al = SSL_AD_HANDSHAKE_FAILURE;
2349 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2350 SSL_R_MISSING_RSA_CERTIFICATE);
2351 goto f_err;
2352 }
2353 rsa = pkey->pkey.rsa;
2354 }
2355
2356 /* TLS and [incidentally] DTLS{0xFEFF} */
2357 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER) {
2358 n2s(p, i);
2359 if (n != i + 2) {
2360 if (!(s->options & SSL_OP_TLS_D5_BUG)) {
2361 al = SSL_AD_DECODE_ERROR;
2362 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2363 SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2364 goto f_err;
2365 } else
2366 p -= 2;
2367 } else
2368 n = i;
2369 }
2370
2371 /*
2372 * Reject overly short RSA ciphertext because we want to be sure
2373 * that the buffer size makes it safe to iterate over the entire
2374 * size of a premaster secret (SSL_MAX_MASTER_KEY_LENGTH). The
2375 * actual expected size is larger due to RSA padding, but the
2376 * bound is sufficient to be safe.
2377 */
2378 if (n < SSL_MAX_MASTER_KEY_LENGTH) {
2379 al = SSL_AD_DECRYPT_ERROR;
2380 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2381 SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2382 goto f_err;
2383 }
2384
2385 /*
2386 * We must not leak whether a decryption failure occurs because of
2387 * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
2388 * section 7.4.7.1). The code follows that advice of the TLS RFC and
2389 * generates a random premaster secret for the case that the decrypt
2390 * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1
2391 */
2392
266483d2 2393 if (RAND_bytes(rand_premaster_secret,
0f113f3e
MC		 2394 sizeof(rand_premaster_secret)) <= 0)
2395 goto err;
2396 decrypt_len =
2397 RSA_private_decrypt((int)n, p, p, rsa, RSA_PKCS1_PADDING);
2398 ERR_clear_error();
2399
2400 /*
2401 * decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH. decrypt_good will
2402 * be 0xff if so and zero otherwise.
2403 */
2404 decrypt_good =
2405 constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2406
2407 /*
2408 * If the version in the decrypted pre-master secret is correct then
2409 * version_good will be 0xff, otherwise it'll be zero. The
2410 * Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2411 * (http://eprint.iacr.org/2003/052/) exploits the version number
2412 * check as a "bad version oracle". Thus version checks are done in
2413 * constant time and are treated like any other decryption error.
2414 */
2415 version_good =
2416 constant_time_eq_8(p[0], (unsigned)(s->client_version >> 8));
2417 version_good &=
2418 constant_time_eq_8(p[1], (unsigned)(s->client_version & 0xff));
2419
2420 /*
2421 * The premaster secret must contain the same version number as the
2422 * ClientHello to detect version rollback attacks (strangely, the
2423 * protocol does not offer such protection for DH ciphersuites).
2424 * However, buggy clients exist that send the negotiated protocol
2425 * version instead if the server does not support the requested
2426 * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such
2427 * clients.
2428 */
2429 if (s->options & SSL_OP_TLS_ROLLBACK_BUG) {
2430 unsigned char workaround_good;
2431 workaround_good =
2432 constant_time_eq_8(p[0], (unsigned)(s->version >> 8));
2433 workaround_good &=
2434 constant_time_eq_8(p[1], (unsigned)(s->version & 0xff));
2435 version_good |= workaround_good;
2436 }
2437
2438 /*
2439 * Both decryption and version must be good for decrypt_good to
2440 * remain non-zero (0xff).
2441 */
2442 decrypt_good &= version_good;
2443
2444 /*
2445 * Now copy rand_premaster_secret over from p using
2446 * decrypt_good_mask. If decryption failed, then p does not
2447 * contain valid plaintext, however, a check above guarantees
2448 * it is still sufficiently large to read from.
2449 */
2450 for (j = 0; j < sizeof(rand_premaster_secret); j++) {
2451 p[j] = constant_time_select_8(decrypt_good, p[j],
2452 rand_premaster_secret[j]);
2453 }
2454
57b272b0 2455 if (!ssl_generate_master_secret(s, p, sizeof(rand_premaster_secret), 0)) {
69f68237
MC		 2456 al = SSL_AD_INTERNAL_ERROR;
2457 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2458 goto f_err;
2459 }
0f113f3e 2460 } else
4c5fac4a 2461#endif
bc36ee62 2462#ifndef OPENSSL_NO_DH
85269210 2463 if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd | SSL_kDHEPSK)) {
0f113f3e
MC		 2464 int idx = -1;
2465 EVP_PKEY *skey = NULL;
d3cc5e61 2466 if (n > 1) {
0f113f3e 2467 n2s(p, i);
d3cc5e61 2468 } else {
85269210 2469 if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
d3cc5e61
MC		 2470 al = SSL_AD_HANDSHAKE_FAILURE;
2471 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2472 SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2473 goto f_err;
2474 }
0f113f3e 2475 i = 0;
d3cc5e61 2476 }
0f113f3e
MC		 2477 if (n && n != i + 2) {
2478 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG)) {
2479 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2480 SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2481 goto err;
2482 } else {
2483 p -= 2;
2484 i = (int)n;
2485 }
2486 }
2487 if (alg_k & SSL_kDHr)
2488 idx = SSL_PKEY_DH_RSA;
2489 else if (alg_k & SSL_kDHd)
2490 idx = SSL_PKEY_DH_DSA;
2491 if (idx >= 0) {
2492 skey = s->cert->pkeys[idx].privatekey;
2493 if ((skey == NULL) ||
2494 (skey->type != EVP_PKEY_DH) || (skey->pkey.dh == NULL)) {
2495 al = SSL_AD_HANDSHAKE_FAILURE;
2496 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2497 SSL_R_MISSING_RSA_CERTIFICATE);
2498 goto f_err;
2499 }
2500 dh_srvr = skey->pkey.dh;
2501 } else if (s->s3->tmp.dh == NULL) {
2502 al = SSL_AD_HANDSHAKE_FAILURE;
2503 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2504 SSL_R_MISSING_TMP_DH_KEY);
2505 goto f_err;
2506 } else
2507 dh_srvr = s->s3->tmp.dh;
2508
2509 if (n == 0L) {
2510 /* Get pubkey from cert */
2511 EVP_PKEY *clkey = X509_get_pubkey(s->session->peer);
2512 if (clkey) {
2513 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2514 dh_clnt = EVP_PKEY_get1_DH(clkey);
2515 }
2516 if (dh_clnt == NULL) {
2517 al = SSL_AD_HANDSHAKE_FAILURE;
2518 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2519 SSL_R_MISSING_TMP_DH_KEY);
2520 goto f_err;
2521 }
2522 EVP_PKEY_free(clkey);
2523 pub = dh_clnt->pub_key;
2524 } else
2525 pub = BN_bin2bn(p, i, NULL);
2526 if (pub == NULL) {
2527 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_BN_LIB);
2528 goto err;
2529 }
2530
2531 i = DH_compute_key(p, pub, dh_srvr);
2532
2533 if (i <= 0) {
2534 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2535 BN_clear_free(pub);
2536 goto err;
2537 }
2538
2539 DH_free(s->s3->tmp.dh);
2540 s->s3->tmp.dh = NULL;
2541 if (dh_clnt)
2542 DH_free(dh_clnt);
2543 else
2544 BN_clear_free(pub);
2545 pub = NULL;
57b272b0 2546 if (!ssl_generate_master_secret(s, p, i, 0)) {
69f68237
MC		 2547 al = SSL_AD_INTERNAL_ERROR;
2548 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2549 goto f_err;
2550 }
0f113f3e
MC		 2551 if (dh_clnt)
2552 return 2;
2553 } else
d02b48c6 2554#endif
ea262260 2555
556efe79 2556#ifndef OPENSSL_NO_EC
85269210 2557 if (alg_k & (SSL_kECDHE | SSL_kECDHr | SSL_kECDHe | SSL_kECDHEPSK)) {
0f113f3e
MC		 2558 int ret = 1;
2559 int field_size = 0;
2560 const EC_KEY *tkey;
2561 const EC_GROUP *group;
2562 const BIGNUM *priv_key;
2563
2564 /* initialize structures for server's ECDH key pair */
2565 if ((srvr_ecdh = EC_KEY_new()) == NULL) {
2566 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
2567 goto err;
2568 }
2569
2570 /* Let's get server private key and group information */
2571 if (alg_k & (SSL_kECDHr | SSL_kECDHe)) {
2572 /* use the certificate */
2573 tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2574 } else {
2575 /*
2576 * use the ephermeral values we saved when generating the
2577 * ServerKeyExchange msg.
2578 */
2579 tkey = s->s3->tmp.ecdh;
2580 }
2581
2582 group = EC_KEY_get0_group(tkey);
2583 priv_key = EC_KEY_get0_private_key(tkey);
2584
2585 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2586 !EC_KEY_set_private_key(srvr_ecdh, priv_key)) {
2587 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2588 goto err;
2589 }
2590
2591 /* Let's get client's public key */
2592 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL) {
2593 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
2594 goto err;
2595 }
2596
2597 if (n == 0L) {
2598 /* Client Publickey was in Client Certificate */
2599
85269210 2600 if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK)) {
0f113f3e
MC		 2601 al = SSL_AD_HANDSHAKE_FAILURE;
2602 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2603 SSL_R_MISSING_TMP_ECDH_KEY);
2604 goto f_err;
2605 }
2606 if (((clnt_pub_pkey = X509_get_pubkey(s->session->peer))
2607 == NULL) || (clnt_pub_pkey->type != EVP_PKEY_EC)) {
2608 /*
2609 * XXX: For now, we do not support client authentication
2610 * using ECDH certificates so this branch (n == 0L) of the
2611 * code is never executed. When that support is added, we
2612 * ought to ensure the key received in the certificate is
2613 * authorized for key agreement. ECDH_compute_key implicitly
2614 * checks that the two ECDH shares are for the same group.
2615 */
2616 al = SSL_AD_HANDSHAKE_FAILURE;
2617 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2618 SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2619 goto f_err;
2620 }
2621
2622 if (EC_POINT_copy(clnt_ecpoint,
2623 EC_KEY_get0_public_key(clnt_pub_pkey->
2624 pkey.ec)) == 0) {
2625 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2626 goto err;
2627 }
2628 ret = 2; /* Skip certificate verify processing */
2629 } else {
2630 /*
2631 * Get client's public key from encoded point in the
2632 * ClientKeyExchange message.
2633 */
2634 if ((bn_ctx = BN_CTX_new()) == NULL) {
2635 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2636 ERR_R_MALLOC_FAILURE);
2637 goto err;
2638 }
2639
2640 /* Get encoded point length */
2641 i = *p;
2642 p += 1;
2643 if (n != 1 + i) {
2644 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2645 goto err;
2646 }
2647 if (EC_POINT_oct2point(group, clnt_ecpoint, p, i, bn_ctx) == 0) {
2648 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2649 goto err;
2650 }
2651 /*
2652 * p is pointing to somewhere in the buffer currently, so set it
2653 * to the start
2654 */
2655 p = (unsigned char *)s->init_buf->data;
2656 }
2657
2658 /* Compute the shared pre-master secret */
2659 field_size = EC_GROUP_get_degree(group);
2660 if (field_size <= 0) {
2661 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2662 goto err;
2663 }
2664 i = ECDH_compute_key(p, (field_size + 7) / 8, clnt_ecpoint, srvr_ecdh,
2665 NULL);
2666 if (i <= 0) {
2667 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2668 goto err;
2669 }
2670
2671 EVP_PKEY_free(clnt_pub_pkey);
2672 EC_POINT_free(clnt_ecpoint);
2673 EC_KEY_free(srvr_ecdh);
2674 BN_CTX_free(bn_ctx);
2675 EC_KEY_free(s->s3->tmp.ecdh);
2676 s->s3->tmp.ecdh = NULL;
2677
57b272b0 2678 if (!ssl_generate_master_secret(s, p, i, 0)) {
69f68237
MC		 2679 al = SSL_AD_INTERNAL_ERROR;
2680 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2681 goto f_err;
2682 }
0f113f3e
MC		 2683 return (ret);
2684 } else
ddac1974 2685#endif
edc032b5 2686#ifndef OPENSSL_NO_SRP
0f113f3e
MC		 2687 if (alg_k & SSL_kSRP) {
2688 int param_len;
2689
2690 n2s(p, i);
2691 param_len = i + 2;
2692 if (param_len > n) {
2693 al = SSL_AD_DECODE_ERROR;
2694 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2695 SSL_R_BAD_SRP_A_LENGTH);
2696 goto f_err;
2697 }
75ebbd9a 2698 if ((s->srp_ctx.A = BN_bin2bn(p, i, NULL)) == NULL) {
0f113f3e
MC		 2699 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_BN_LIB);
2700 goto err;
2701 }
2702 if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2703 || BN_is_zero(s->srp_ctx.A)) {
2704 al = SSL_AD_ILLEGAL_PARAMETER;
2705 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2706 SSL_R_BAD_SRP_PARAMETERS);
2707 goto f_err;
2708 }
b548a1f1 2709 OPENSSL_free(s->session->srp_username);
0f113f3e
MC		 2710 s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2711 if (s->session->srp_username == NULL) {
2712 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
2713 goto err;
2714 }
2715
57b272b0 2716 if (!srp_generate_server_master_secret(s)) {
0f113f3e
MC		 2717 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2718 goto err;
2719 }
2720
2721 p += i;
2722 } else
2723#endif /* OPENSSL_NO_SRP */
2724 if (alg_k & SSL_kGOST) {
2725 int ret = 0;
2726 EVP_PKEY_CTX *pkey_ctx;
2727 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2728 unsigned char premaster_secret[32], *start;
2729 size_t outlen = 32, inlen;
2730 unsigned long alg_a;
2731 int Ttag, Tclass;
2732 long Tlen;
2733
2734 /* Get our certificate private key */
2735 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2736 if (alg_a & SSL_aGOST94)
2737 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2738 else if (alg_a & SSL_aGOST01)
2739 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2740
2741 pkey_ctx = EVP_PKEY_CTX_new(pk, NULL);
2742 EVP_PKEY_decrypt_init(pkey_ctx);
2743 /*
2744 * If client certificate is present and is of the same type, maybe
2745 * use it for key exchange. Don't mind errors from
2746 * EVP_PKEY_derive_set_peer, because it is completely valid to use a
2747 * client certificate for authorization only.
2748 */
2749 client_pub_pkey = X509_get_pubkey(s->session->peer);
2750 if (client_pub_pkey) {
2751 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2752 ERR_clear_error();
2753 }
2754 /* Decrypt session key */
2755 if (ASN1_get_object
2756 ((const unsigned char **)&p, &Tlen, &Ttag, &Tclass,
2757 n) != V_ASN1_CONSTRUCTED || Ttag != V_ASN1_SEQUENCE
2758 || Tclass != V_ASN1_UNIVERSAL) {
2759 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2760 SSL_R_DECRYPTION_FAILED);
2761 goto gerr;
2762 }
2763 start = p;
2764 inlen = Tlen;
2765 if (EVP_PKEY_decrypt
2766 (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) {
2767 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2768 SSL_R_DECRYPTION_FAILED);
2769 goto gerr;
2770 }
2771 /* Generate master secret */
57b272b0
DSH		 2772 if (!ssl_generate_master_secret(s, premaster_secret,
2773 sizeof(premaster_secret), 0)) {
69f68237
MC		 2774 al = SSL_AD_INTERNAL_ERROR;
2775 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2776 goto f_err;
2777 }
0f113f3e
MC		 2778 /* Check if pubkey from client certificate was used */
2779 if (EVP_PKEY_CTX_ctrl
2780 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2781 ret = 2;
2782 else
2783 ret = 1;
2784 gerr:
2785 EVP_PKEY_free(client_pub_pkey);
2786 EVP_PKEY_CTX_free(pkey_ctx);
2787 if (ret)
2788 return ret;
c5ba2d99 2789 goto err;
0f113f3e
MC		 2790 } else {
2791 al = SSL_AD_HANDSHAKE_FAILURE;
2792 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_UNKNOWN_CIPHER_TYPE);
2793 goto f_err;
2794 }
2795
2796 return (1);
2797 f_err:
2798 ssl3_send_alert(s, SSL3_AL_FATAL, al);
556efe79 2799#if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_EC) || defined(OPENSSL_NO_SRP)
0f113f3e 2800 err:
ea262260 2801#endif
556efe79 2802#ifndef OPENSSL_NO_EC
0f113f3e
MC		 2803 EVP_PKEY_free(clnt_pub_pkey);
2804 EC_POINT_free(clnt_ecpoint);
8fdc3734 2805 EC_KEY_free(srvr_ecdh);
0f113f3e 2806 BN_CTX_free(bn_ctx);
85269210
DSH		 2807#endif
2808#ifndef OPENSSL_NO_PSK
2809 OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
2810 s->s3->tmp.psk = NULL;
58964a49 2811#endif
cf9b0b6f 2812 s->state = SSL_ST_ERR;
0f113f3e
MC		 2813 return (-1);
2814}
d02b48c6 2815
36d16f8e 2816int ssl3_get_cert_verify(SSL *s)
0f113f3e
MC		 2817{
2818 EVP_PKEY *pkey = NULL;
f532a35d 2819 unsigned char *sig, *data;
0f113f3e
MC		 2820 int al, ok, ret = 0;
2821 long n;
2822 int type = 0, i, j;
f532a35d 2823 unsigned int len;
0f113f3e
MC		 2824 X509 *peer;
2825 const EVP_MD *md = NULL;
2826 EVP_MD_CTX mctx;
f532a35d 2827 PACKET pkt;
0f113f3e
MC		 2828 EVP_MD_CTX_init(&mctx);
2829
a0bd6493
MC		 2830 /*
2831 * We should only process a CertificateVerify message if we have received
2832 * a Certificate from the client. If so then |s->session->peer| will be non
2833 * NULL. In some instances a CertificateVerify message is not required even
2834 * if the peer has sent a Certificate (e.g. such as in the case of static
2835 * DH). In that case the ClientKeyExchange processing will skip the
2836 * CertificateVerify state so we should not arrive here.
2837 */
2838 if (s->session->peer == NULL) {
2839 ret = 1;
2840 goto end;
2841 }
2842
0f113f3e
MC		 2843 n = s->method->ssl_get_message(s,
2844 SSL3_ST_SR_CERT_VRFY_A,
2845 SSL3_ST_SR_CERT_VRFY_B,
a0bd6493
MC		 2846 SSL3_MT_CERTIFICATE_VERIFY,
2847 SSL3_RT_MAX_PLAIN_LENGTH, &ok);
0f113f3e
MC		 2848
2849 if (!ok)
2850 return ((int)n);
2851
a0bd6493
MC		 2852 peer = s->session->peer;
2853 pkey = X509_get_pubkey(peer);
2854 type = X509_certificate_type(peer, pkey);
0f113f3e
MC		 2855
2856 if (!(type & EVP_PKT_SIGN)) {
2857 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2858 SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2859 al = SSL_AD_ILLEGAL_PARAMETER;
2860 goto f_err;
2861 }
2862
0f113f3e 2863 /* we now have a signature that we need to verify */
f532a35d
MC		 2864 if (!PACKET_buf_init(&pkt, s->init_msg, n)) {
2865 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
2866 al = SSL_AD_INTERNAL_ERROR;
2867 goto f_err;
2868 }
0f113f3e
MC		 2869 /* Check for broken implementations of GOST ciphersuites */
2870 /*
2871 * If key is GOST and n is exactly 64, it is bare signature without
2872 * length field
2873 */
2874 if (n == 64 && (pkey->type == NID_id_GostR3410_94 ||
2875 pkey->type == NID_id_GostR3410_2001)) {
f532a35d 2876 len = 64;
0f113f3e
MC		 2877 } else {
2878 if (SSL_USE_SIGALGS(s)) {
f532a35d
MC		 2879 int rv;
2880
2881 if (!PACKET_get_bytes(&pkt, &sig, 2)) {
2882 al = SSL_AD_DECODE_ERROR;
2883 goto f_err;
2884 }
2885 rv = tls12_check_peer_sigalg(&md, s, sig, pkey);
0f113f3e
MC		 2886 if (rv == -1) {
2887 al = SSL_AD_INTERNAL_ERROR;
2888 goto f_err;
2889 } else if (rv == 0) {
2890 al = SSL_AD_DECODE_ERROR;
2891 goto f_err;
2892 }
f37f20ff 2893#ifdef SSL_DEBUG
0f113f3e 2894 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
f37f20ff 2895#endif
0f113f3e 2896 }
f532a35d 2897 if (!PACKET_get_net_2(&pkt, &len)) {
0f113f3e
MC		 2898 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
2899 al = SSL_AD_DECODE_ERROR;
2900 goto f_err;
2901 }
2902 }
2903 j = EVP_PKEY_size(pkey);
f532a35d 2904 if (((int)len > j) || ((int)PACKET_remaining(&pkt) > j) || (n <= 0)) {
0f113f3e
MC		 2905 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE);
2906 al = SSL_AD_DECODE_ERROR;
2907 goto f_err;
2908 }
f532a35d
MC		 2909 if (!PACKET_get_bytes(&pkt, &data, len)) {
2910 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
2911 al = SSL_AD_DECODE_ERROR;
2912 goto f_err;
2913 }
0f113f3e
MC		 2914
2915 if (SSL_USE_SIGALGS(s)) {
2916 long hdatalen = 0;
2917 void *hdata;
2918 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
2919 if (hdatalen <= 0) {
2920 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
2921 al = SSL_AD_INTERNAL_ERROR;
2922 goto f_err;
2923 }
f37f20ff 2924#ifdef SSL_DEBUG
0f113f3e
MC		 2925 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
2926 EVP_MD_name(md));
f37f20ff 2927#endif
0f113f3e
MC		 2928 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
2929 || !EVP_VerifyUpdate(&mctx, hdata, hdatalen)) {
2930 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
2931 al = SSL_AD_INTERNAL_ERROR;
2932 goto f_err;
2933 }
2934
f532a35d 2935 if (EVP_VerifyFinal(&mctx, data, len, pkey) <= 0) {
0f113f3e
MC		 2936 al = SSL_AD_DECRYPT_ERROR;
2937 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_SIGNATURE);
2938 goto f_err;
2939 }
2940 } else
2941#ifndef OPENSSL_NO_RSA
2942 if (pkey->type == EVP_PKEY_RSA) {
2943 i = RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
f532a35d 2944 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, data, len,
0f113f3e
MC		 2945 pkey->pkey.rsa);
2946 if (i < 0) {
2947 al = SSL_AD_DECRYPT_ERROR;
2948 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_RSA_DECRYPT);
2949 goto f_err;
2950 }
2951 if (i == 0) {
2952 al = SSL_AD_DECRYPT_ERROR;
2953 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_RSA_SIGNATURE);
2954 goto f_err;
2955 }
2956 } else
d02b48c6 2957#endif
bc36ee62 2958#ifndef OPENSSL_NO_DSA
0f113f3e
MC		 2959 if (pkey->type == EVP_PKEY_DSA) {
2960 j = DSA_verify(pkey->save_type,
2961 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
f532a35d 2962 SHA_DIGEST_LENGTH, data, len, pkey->pkey.dsa);
0f113f3e
MC		 2963 if (j <= 0) {
2964 /* bad signature */
2965 al = SSL_AD_DECRYPT_ERROR;
2966 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_DSA_SIGNATURE);
2967 goto f_err;
2968 }
2969 } else
ea262260 2970#endif
10bf4fc2 2971#ifndef OPENSSL_NO_EC
0f113f3e
MC		 2972 if (pkey->type == EVP_PKEY_EC) {
2973 j = ECDSA_verify(pkey->save_type,
2974 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
f532a35d 2975 SHA_DIGEST_LENGTH, data, len, pkey->pkey.ec);
0f113f3e
MC		 2976 if (j <= 0) {
2977 /* bad signature */
2978 al = SSL_AD_DECRYPT_ERROR;
2979 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_ECDSA_SIGNATURE);
2980 goto f_err;
2981 }
2982 } else
d02b48c6 2983#endif
0f113f3e
MC		 2984 if (pkey->type == NID_id_GostR3410_94
2985 || pkey->type == NID_id_GostR3410_2001) {
2986 unsigned char signature[64];
2987 int idx;
2988 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey, NULL);
2989 EVP_PKEY_verify_init(pctx);
f532a35d
MC		 2990 if (len != 64) {
2991 fprintf(stderr, "GOST signature length is %d", len);
0f113f3e
MC		 2992 }
2993 for (idx = 0; idx < 64; idx++) {
f532a35d 2994 signature[63 - idx] = data[idx];
0f113f3e
MC		 2995 }
2996 j = EVP_PKEY_verify(pctx, signature, 64, s->s3->tmp.cert_verify_md,
2997 32);
2998 EVP_PKEY_CTX_free(pctx);
2999 if (j <= 0) {
3000 al = SSL_AD_DECRYPT_ERROR;
3001 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_ECDSA_SIGNATURE);
3002 goto f_err;
3003 }
3004 } else {
3005 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3006 al = SSL_AD_UNSUPPORTED_CERTIFICATE;
3007 goto f_err;
3008 }
3009
3010 ret = 1;
3011 if (0) {
3012 f_err:
3013 ssl3_send_alert(s, SSL3_AL_FATAL, al);
cf9b0b6f 3014 s->state = SSL_ST_ERR;
0f113f3e
MC		 3015 }
3016 end:
25aaa98a
RS		 3017 BIO_free(s->s3->handshake_buffer);
3018 s->s3->handshake_buffer = NULL;
0f113f3e
MC		 3019 EVP_MD_CTX_cleanup(&mctx);
3020 EVP_PKEY_free(pkey);
3021 return (ret);
3022}
d02b48c6 3023
36d16f8e 3024int ssl3_get_client_certificate(SSL *s)
0f113f3e
MC		 3025{
3026 int i, ok, al, ret = -1;
3027 X509 *x = NULL;
0bc09ecd
MC		 3028 unsigned long l, llen, n;
3029 const unsigned char *certstart;
3030 unsigned char *certbytes;
0f113f3e 3031 STACK_OF(X509) *sk = NULL;
0bc09ecd 3032 PACKET pkt, spkt;
0f113f3e
MC		 3033
3034 n = s->method->ssl_get_message(s,
3035 SSL3_ST_SR_CERT_A,
3036 SSL3_ST_SR_CERT_B,
3037 -1, s->max_cert_list, &ok);
3038
3039 if (!ok)
3040 return ((int)n);
3041
3042 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) {
3043 if ((s->verify_mode & SSL_VERIFY_PEER) &&
3044 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
3045 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,
3046 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3047 al = SSL_AD_HANDSHAKE_FAILURE;
3048 goto f_err;
3049 }
3050 /*
3051 * If tls asked for a client cert, the client must return a 0 list
3052 */
3053 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request) {
3054 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,
3055 SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3056 al = SSL_AD_UNEXPECTED_MESSAGE;
3057 goto f_err;
3058 }
3059 s->s3->tmp.reuse_message = 1;
3060 return (1);
3061 }
3062
3063 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
3064 al = SSL_AD_UNEXPECTED_MESSAGE;
3065 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, SSL_R_WRONG_MESSAGE_TYPE);
3066 goto f_err;
3067 }
0bc09ecd
MC		 3068
3069 if (!PACKET_buf_init(&pkt, s->init_msg, n)) {
3070 al = SSL_AD_INTERNAL_ERROR;
3071 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3072 goto f_err;
3073 }
0f113f3e
MC		 3074
3075 if ((sk = sk_X509_new_null()) == NULL) {
3076 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
66696478 3077 goto done;
0f113f3e
MC		 3078 }
3079
0bc09ecd
MC		 3080 if (!PACKET_get_net_3(&pkt, &llen)
3081 || !PACKET_get_sub_packet(&pkt, &spkt, llen)
3082 || PACKET_remaining(&pkt) != 0) {
0f113f3e
MC		 3083 al = SSL_AD_DECODE_ERROR;
3084 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
3085 goto f_err;
3086 }
0bc09ecd
MC		 3087
3088 while (PACKET_remaining(&spkt) > 0) {
3089 if (!PACKET_get_net_3(&spkt, &l)
3090 || !PACKET_get_bytes(&spkt, &certbytes, l)) {
0f113f3e
MC		 3091 al = SSL_AD_DECODE_ERROR;
3092 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,
3093 SSL_R_CERT_LENGTH_MISMATCH);
3094 goto f_err;
3095 }
3096
0bc09ecd
MC		 3097 certstart = certbytes;
3098 x = d2i_X509(NULL, (const unsigned char **)&certbytes, l);
0f113f3e
MC		 3099 if (x == NULL) {
3100 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB);
66696478 3101 goto done;
0f113f3e 3102 }
0bc09ecd 3103 if (certbytes != (certstart + l)) {
0f113f3e
MC		 3104 al = SSL_AD_DECODE_ERROR;
3105 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,
3106 SSL_R_CERT_LENGTH_MISMATCH);
3107 goto f_err;
3108 }
3109 if (!sk_X509_push(sk, x)) {
3110 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
66696478 3111 goto done;
0f113f3e
MC		 3112 }
3113 x = NULL;
0f113f3e
MC		 3114 }
3115
3116 if (sk_X509_num(sk) <= 0) {
3117 /* TLS does not mind 0 certs returned */
3118 if (s->version == SSL3_VERSION) {
3119 al = SSL_AD_HANDSHAKE_FAILURE;
3120 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,
3121 SSL_R_NO_CERTIFICATES_RETURNED);
3122 goto f_err;
3123 }
3124 /* Fail for TLS only if we required a certificate */
3125 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3126 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
3127 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,
3128 SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3129 al = SSL_AD_HANDSHAKE_FAILURE;
3130 goto f_err;
3131 }
3132 /* No client certificate so digest cached records */
124037fd 3133 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) {
0f113f3e
MC		 3134 al = SSL_AD_INTERNAL_ERROR;
3135 goto f_err;
3136 }
3137 } else {
3138 EVP_PKEY *pkey;
3139 i = ssl_verify_cert_chain(s, sk);
3140 if (i <= 0) {
3141 al = ssl_verify_alarm_type(s->verify_result);
3142 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,
3143 SSL_R_CERTIFICATE_VERIFY_FAILED);
3144 goto f_err;
3145 }
3146 if (i > 1) {
3147 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, i);
3148 al = SSL_AD_HANDSHAKE_FAILURE;
3149 goto f_err;
3150 }
3151 pkey = X509_get_pubkey(sk_X509_value(sk, 0));
3152 if (pkey == NULL) {
3153 al = SSL3_AD_HANDSHAKE_FAILURE;
3154 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,
3155 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
3156 goto f_err;
3157 }
3158 EVP_PKEY_free(pkey);
3159 }
3160
222561fe 3161 X509_free(s->session->peer);
0f113f3e
MC		 3162 s->session->peer = sk_X509_shift(sk);
3163 s->session->verify_result = s->verify_result;
3164
c34b0f99
DSH		 3165 sk_X509_pop_free(s->session->peer_chain, X509_free);
3166 s->session->peer_chain = sk;
0f113f3e
MC		 3167 /*
3168 * Inconsistency alert: cert_chain does *not* include the peer's own
3169 * certificate, while we do include it in s3_clnt.c
3170 */
0f113f3e 3171 sk = NULL;
0f113f3e 3172 ret = 1;
66696478
RS		 3173 goto done;
3174
0f113f3e 3175 f_err:
66696478
RS		 3176 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3177 done:
cf9b0b6f 3178 s->state = SSL_ST_ERR;
222561fe
RS		 3179 X509_free(x);
3180 sk_X509_pop_free(sk, X509_free);
0f113f3e
MC		 3181 return (ret);
3182}
d02b48c6 3183
6b691a5c 3184int ssl3_send_server_certificate(SSL *s)
0f113f3e
MC		 3185{
3186 CERT_PKEY *cpk;
3187
3188 if (s->state == SSL3_ST_SW_CERT_A) {
3189 cpk = ssl_get_server_send_pkey(s);
3190 if (cpk == NULL) {
55a9a16f
MC		 3191 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3192 s->state = SSL_ST_ERR;
3193 return (0);
0f113f3e
MC		 3194 }
3195
3196 if (!ssl3_output_cert_chain(s, cpk)) {
3197 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
cf9b0b6f 3198 s->state = SSL_ST_ERR;
0f113f3e
MC		 3199 return (0);
3200 }
3201 s->state = SSL3_ST_SW_CERT_B;
3202 }
3203
3204 /* SSL3_ST_SW_CERT_B */
3205 return ssl_do_write(s);
3206}
c519e89f 3207
c519e89f 3208/* send a new session ticket (not necessarily for a new session) */
6434abbf 3209int ssl3_send_newsession_ticket(SSL *s)
0f113f3e 3210{
687eaf27
MC		 3211 unsigned char *senc = NULL;
3212 EVP_CIPHER_CTX ctx;
3213 HMAC_CTX hctx;
3214
0f113f3e 3215 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) {
687eaf27 3216 unsigned char *p, *macstart;
0f113f3e
MC		 3217 const unsigned char *const_p;
3218 int len, slen_full, slen;
3219 SSL_SESSION *sess;
3220 unsigned int hlen;
0f113f3e
MC		 3221 SSL_CTX *tctx = s->initial_ctx;
3222 unsigned char iv[EVP_MAX_IV_LENGTH];
3223 unsigned char key_name[16];
3224
3225 /* get session encoding length */
3226 slen_full = i2d_SSL_SESSION(s->session, NULL);
3227 /*
3228 * Some length values are 16 bits, so forget it if session is too
3229 * long
3230 */
cf9b0b6f
MC		 3231 if (slen_full == 0 || slen_full > 0xFF00) {
3232 s->state = SSL_ST_ERR;
0f113f3e 3233 return -1;
cf9b0b6f 3234 }
0f113f3e 3235 senc = OPENSSL_malloc(slen_full);
cf9b0b6f
MC		 3236 if (!senc) {
3237 s->state = SSL_ST_ERR;
0f113f3e 3238 return -1;
cf9b0b6f 3239 }
687eaf27
MC		 3240
3241 EVP_CIPHER_CTX_init(&ctx);
3242 HMAC_CTX_init(&hctx);
3243
0f113f3e 3244 p = senc;
687eaf27
MC		 3245 if (!i2d_SSL_SESSION(s->session, &p))
3246 goto err;
0f113f3e
MC		 3247
3248 /*
3249 * create a fresh copy (not shared with other threads) to clean up
3250 */
3251 const_p = senc;
3252 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
687eaf27
MC		 3253 if (sess == NULL)
3254 goto err;
0f113f3e
MC		 3255 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3256
3257 slen = i2d_SSL_SESSION(sess, NULL);
687eaf27
MC		 3258 if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */
3259 SSL_SESSION_free(sess);
3260 goto err;
0f113f3e
MC		 3261 }
3262 p = senc;
687eaf27
MC		 3263 if (!i2d_SSL_SESSION(sess, &p)) {
3264 SSL_SESSION_free(sess);
3265 goto err;
3266 }
0f113f3e
MC		 3267 SSL_SESSION_free(sess);
3268
50e735f9
MC		 3269 /*-
3270 * Grow buffer if need be: the length calculation is as
3271 * follows handshake_header_length +
3272 * 4 (ticket lifetime hint) + 2 (ticket length) +
3273 * 16 (key name) + max_iv_len (iv length) +
3274 * session_length + max_enc_block_size (max encrypted session
3275 * length) + max_md_size (HMAC).
3276 */
0f113f3e
MC		 3277 if (!BUF_MEM_grow(s->init_buf,
3278 SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH +
3279 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
687eaf27
MC		 3280 goto err;
3281
0f113f3e 3282 p = ssl_handshake_start(s);
0f113f3e
MC		 3283 /*
3284 * Initialize HMAC and cipher contexts. If callback present it does
3285 * all the work otherwise use generated values from parent ctx.
3286 */
3287 if (tctx->tlsext_ticket_key_cb) {
3288 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
687eaf27
MC		 3289 &hctx, 1) < 0)
3290 goto err;
0f113f3e 3291 } else {
687eaf27
MC		 3292 if (RAND_bytes(iv, 16) <= 0)
3293 goto err;
3294 if (!EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3295 tctx->tlsext_tick_aes_key, iv))
3296 goto err;
3297 if (!HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3298 EVP_sha256(), NULL))
3299 goto err;
0f113f3e
MC		 3300 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3301 }
3302
3303 /*
3304 * Ticket lifetime hint (advisory only): We leave this unspecified
3305 * for resumed session (for simplicity), and guess that tickets for
3306 * new sessions will live as long as their sessions.
3307 */
3308 l2n(s->hit ? 0 : s->session->timeout, p);
3309
3310 /* Skip ticket length for now */
3311 p += 2;
3312 /* Output key name */
3313 macstart = p;
3314 memcpy(p, key_name, 16);
3315 p += 16;
3316 /* output IV */
3317 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3318 p += EVP_CIPHER_CTX_iv_length(&ctx);
3319 /* Encrypt session data */
687eaf27
MC		 3320 if (!EVP_EncryptUpdate(&ctx, p, &len, senc, slen))
3321 goto err;
0f113f3e 3322 p += len;
687eaf27
MC		 3323 if (!EVP_EncryptFinal(&ctx, p, &len))
3324 goto err;
0f113f3e 3325 p += len;
0f113f3e 3326
687eaf27
MC		 3327 if (!HMAC_Update(&hctx, macstart, p - macstart))
3328 goto err;
3329 if (!HMAC_Final(&hctx, p, &hlen))
3330 goto err;
3331
3332 EVP_CIPHER_CTX_cleanup(&ctx);
0f113f3e
MC		 3333 HMAC_CTX_cleanup(&hctx);
3334
3335 p += hlen;
3336 /* Now write out lengths: p points to end of data written */
3337 /* Total length */
3338 len = p - ssl_handshake_start(s);
0f113f3e
MC		 3339 /* Skip ticket lifetime hint */
3340 p = ssl_handshake_start(s) + 4;
3341 s2n(len - 6, p);
61986d32 3342 if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len))
4f9fab6b 3343 goto err;
0f113f3e
MC		 3344 s->state = SSL3_ST_SW_SESSION_TICKET_B;
3345 OPENSSL_free(senc);
3346 }
3347
3348 /* SSL3_ST_SW_SESSION_TICKET_B */
3349 return ssl_do_write(s);
687eaf27 3350 err:
b548a1f1 3351 OPENSSL_free(senc);
687eaf27
MC		 3352 EVP_CIPHER_CTX_cleanup(&ctx);
3353 HMAC_CTX_cleanup(&hctx);
cf9b0b6f 3354 s->state = SSL_ST_ERR;
687eaf27 3355 return -1;
0f113f3e 3356}
67c8e7f4
DSH		 3357
3358int ssl3_send_cert_status(SSL *s)
0f113f3e
MC		 3359{
3360 if (s->state == SSL3_ST_SW_CERT_STATUS_A) {
3361 unsigned char *p;
50e735f9
MC		 3362 /*-
3363 * Grow buffer if need be: the length calculation is as
3364 * follows 1 (message type) + 3 (message length) +
3365 * 1 (ocsp response type) + 3 (ocsp response length)
3366 * + (ocsp response)
3367 */
cf9b0b6f
MC		 3368 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen)) {
3369 s->state = SSL_ST_ERR;
0f113f3e 3370 return -1;
cf9b0b6f 3371 }
0f113f3e
MC		 3372
3373 p = (unsigned char *)s->init_buf->data;
3374
3375 /* do the header */
3376 *(p++) = SSL3_MT_CERTIFICATE_STATUS;
3377 /* message length */
3378 l2n3(s->tlsext_ocsp_resplen + 4, p);
3379 /* status type */
3380 *(p++) = s->tlsext_status_type;
3381 /* length of OCSP response */
3382 l2n3(s->tlsext_ocsp_resplen, p);
3383 /* actual response */
3384 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3385 /* number of bytes to write */
3386 s->init_num = 8 + s->tlsext_ocsp_resplen;
3387 s->state = SSL3_ST_SW_CERT_STATUS_B;
3388 s->init_off = 0;
3389 }
3390
3391 /* SSL3_ST_SW_CERT_STATUS_B */
3392 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
3393}
ee2ffc27 3394
e481f9b9 3395#ifndef OPENSSL_NO_NEXTPROTONEG
0f113f3e
MC		 3396/*
3397 * ssl3_get_next_proto reads a Next Protocol Negotiation handshake message.
3398 * It sets the next_proto member in s if found
3399 */
ee2ffc27 3400int ssl3_get_next_proto(SSL *s)
0f113f3e
MC		 3401{
3402 int ok;
c3fc7eea 3403 unsigned int proto_len, padding_len;
0f113f3e 3404 long n;
c3fc7eea 3405 PACKET pkt;
0f113f3e
MC		 3406
3407 /*
3408 * Clients cannot send a NextProtocol message if we didn't see the
3409 * extension in their ClientHello
3410 */
3411 if (!s->s3->next_proto_neg_seen) {
3412 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,
3413 SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
cf9b0b6f 3414 s->state = SSL_ST_ERR;
0f113f3e
MC		 3415 return -1;
3416 }
3417
3418 /* See the payload format below */
3419 n = s->method->ssl_get_message(s,
3420 SSL3_ST_SR_NEXT_PROTO_A,
3421 SSL3_ST_SR_NEXT_PROTO_B,
3422 SSL3_MT_NEXT_PROTO, 514, &ok);
3423
3424 if (!ok)
3425 return ((int)n);
3426
3427 /*
3428 * s->state doesn't reflect whether ChangeCipherSpec has been received in
3429 * this handshake, but s->s3->change_cipher_spec does (will be reset by
3430 * ssl3_get_finished).
3431 */
3432 if (!s->s3->change_cipher_spec) {
3433 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO, SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
cf9b0b6f 3434 s->state = SSL_ST_ERR;
0f113f3e
MC		 3435 return -1;
3436 }
3437
cf9b0b6f 3438 if (n < 2) {
c3fc7eea 3439 goto err; /* The body must be > 1 bytes long */
cf9b0b6f 3440 }
0f113f3e 3441
c3fc7eea
MC		 3442 if (!PACKET_buf_init(&pkt, s->init_msg, n)) {
3443 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO, ERR_R_INTERNAL_ERROR);
3444 goto err;
3445 }
0f113f3e 3446
50e735f9
MC		 3447 /*-
3448 * The payload looks like:
3449 * uint8 proto_len;
3450 * uint8 proto[proto_len];
3451 * uint8 padding_len;
3452 * uint8 padding[padding_len];
3453 */
c3fc7eea
MC		 3454 if (!PACKET_get_1(&pkt, &proto_len)){
3455 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO, SSL_R_LENGTH_MISMATCH);
3456 goto err;
cf9b0b6f 3457 }
0f113f3e
MC		 3458
3459 s->next_proto_negotiated = OPENSSL_malloc(proto_len);
c3fc7eea 3460 if (s->next_proto_negotiated == NULL) {
0f113f3e 3461 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO, ERR_R_MALLOC_FAILURE);
c3fc7eea
MC		 3462 goto err;
3463 }
3464
3465 if (!PACKET_copy_bytes(&pkt, s->next_proto_negotiated, proto_len)
3466 || !PACKET_get_1(&pkt, &padding_len)
3467 || PACKET_remaining(&pkt) != padding_len) {
3468 OPENSSL_free(s->next_proto_negotiated);
3469 s->next_proto_negotiated = NULL;
3470 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO, SSL_R_LENGTH_MISMATCH);
3471 goto err;
0f113f3e 3472 }
0f113f3e
MC		 3473
3474 return 1;
c3fc7eea
MC		 3475err:
3476 s->state = SSL_ST_ERR;
3477 return 0;
0f113f3e 3478}
6434abbf 3479#endif
d45ba43d
MC		 3480
3481#define SSLV2_CIPHER_LEN 3
3482
3483STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s, unsigned char *p,
3484 int num,
3485 STACK_OF(SSL_CIPHER) **skp,
3486 int sslv2format)
3487{
3488 const SSL_CIPHER *c;
3489 STACK_OF(SSL_CIPHER) *sk;
3490 int i, n;
3491
3492 if (s->s3)
3493 s->s3->send_connection_binding = 0;
3494
3495 if(sslv2format) {
3496 n = SSLV2_CIPHER_LEN;
3497 } else {
3498 n = ssl_put_cipher_by_char(s, NULL, NULL);
3499 }
3500 if (n == 0 || (num % n) != 0) {
3501 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3502 SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
3503 return (NULL);
3504 }
3505 if ((skp == NULL) || (*skp == NULL)) {
3506 sk = sk_SSL_CIPHER_new_null(); /* change perhaps later */
3507 if(sk == NULL) {
3508 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
3509 return NULL;
3510 }
3511 } else {
3512 sk = *skp;
3513 sk_SSL_CIPHER_zero(sk);
3514 }
3515
76106e60
DSH		 3516 OPENSSL_free(s->s3->tmp.ciphers_raw);
3517 s->s3->tmp.ciphers_raw = BUF_memdup(p, num);
3518 if (s->s3->tmp.ciphers_raw == NULL) {
d45ba43d
MC		 3519 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
3520 goto err;
3521 }
76106e60 3522 s->s3->tmp.ciphers_rawlen = (size_t)num;
d45ba43d
MC		 3523
3524 for (i = 0; i < num; i += n) {
3525 /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */
3526 if (s->s3 && (n != 3 || !p[0]) &&
3527 (p[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
3528 (p[n - 1] == (SSL3_CK_SCSV & 0xff))) {
3529 /* SCSV fatal if renegotiating */
3530 if (s->renegotiate) {
3531 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3532 SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
3533 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3534 goto err;
3535 }
3536 s->s3->send_connection_binding = 1;
3537 p += n;
3538#ifdef OPENSSL_RI_DEBUG
3539 fprintf(stderr, "SCSV received by server\n");
3540#endif
3541 continue;
3542 }
3543
3544 /* Check for TLS_FALLBACK_SCSV */
3545 if ((n != 3 || !p[0]) &&
3546 (p[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) &&
3547 (p[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) {
3548 /*
3549 * The SCSV indicates that the client previously tried a higher
3550 * version. Fail if the current version is an unexpected
3551 * downgrade.
3552 */
3553 if (!SSL_ctrl(s, SSL_CTRL_CHECK_PROTO_VERSION, 0, NULL)) {
3554 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
3555 SSL_R_INAPPROPRIATE_FALLBACK);
3556 if (s->s3)
3557 ssl3_send_alert(s, SSL3_AL_FATAL,
3558 SSL_AD_INAPPROPRIATE_FALLBACK);
3559 goto err;
3560 }
3561 p += n;
3562 continue;
3563 }
3564
3565 if(sslv2format) {
3566 /*
3567 * We only support SSLv2 format ciphers in SSLv3+ using a
3568 * SSLv2 backward compatible ClientHello. In this case the first
3569 * byte is always 0 for SSLv3 compatible ciphers. Anything else
3570 * is an SSLv2 cipher and we ignore it
3571 */
3572 if(p[0] == 0)
3573 c = ssl_get_cipher_by_char(s, &p[1]);
3574 else
3575 c = NULL;
3576 } else {
3577 c = ssl_get_cipher_by_char(s, p);
3578 }
3579 p += n;
3580 if (c != NULL) {
3581 if (!sk_SSL_CIPHER_push(sk, c)) {
3582 SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
3583 goto err;
3584 }
3585 }
3586 }
3587
3588 if (skp != NULL)
3589 *skp = sk;
3590 return (sk);
3591 err:
3592 if ((skp == NULL) || (*skp == NULL))
3593 sk_SSL_CIPHER_free(sk);
3594 return (NULL);
3595}
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