1 /* ssl/s3_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111 /* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113 *
114 * Portions of the attached software ("Contribution") are developed by
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 *
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122 *
123 */
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 */
150
151 #include <stdio.h>
152 #include "ssl_locl.h"
153 #include "kssl_lcl.h"
154 #include <openssl/buffer.h>
155 #include <openssl/rand.h>
156 #include <openssl/objects.h>
157 #include <openssl/evp.h>
158 #include <openssl/md5.h>
159 #ifdef OPENSSL_FIPS
160 # include <openssl/fips.h>
161 #endif
162 #ifndef OPENSSL_NO_DH
163 # include <openssl/dh.h>
164 #endif
165 #include <openssl/bn.h>
166 #ifndef OPENSSL_NO_ENGINE
167 # include <openssl/engine.h>
168 #endif
169
170 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b);
171 #ifndef OPENSSL_NO_TLSEXT
172 static int ssl3_check_finished(SSL *s);
173 #endif
174
175 #ifndef OPENSSL_NO_SSL3_METHOD
ssl3_get_client_method(int ver)176 static const SSL_METHOD *ssl3_get_client_method(int ver)
177 {
178 if (ver == SSL3_VERSION)
179 return (SSLv3_client_method());
180 else
181 return (NULL);
182 }
183
IMPLEMENT_ssl3_meth_func(SSLv3_client_method,ssl_undefined_function,ssl3_connect,ssl3_get_client_method)184 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
185 ssl_undefined_function,
186 ssl3_connect, ssl3_get_client_method)
187 #endif
188 int ssl3_connect(SSL *s)
189 {
190 BUF_MEM *buf = NULL;
191 unsigned long Time = (unsigned long)time(NULL);
192 void (*cb) (const SSL *ssl, int type, int val) = NULL;
193 int ret = -1;
194 int new_state, state, skip = 0;
195
196 RAND_add(&Time, sizeof(Time), 0);
197 ERR_clear_error();
198 clear_sys_error();
199
200 if (s->info_callback != NULL)
201 cb = s->info_callback;
202 else if (s->ctx->info_callback != NULL)
203 cb = s->ctx->info_callback;
204
205 s->in_handshake++;
206 if (!SSL_in_init(s) || SSL_in_before(s))
207 SSL_clear(s);
208
209 #ifndef OPENSSL_NO_HEARTBEATS
210 /*
211 * If we're awaiting a HeartbeatResponse, pretend we already got and
212 * don't await it anymore, because Heartbeats don't make sense during
213 * handshakes anyway.
214 */
215 if (s->tlsext_hb_pending) {
216 s->tlsext_hb_pending = 0;
217 s->tlsext_hb_seq++;
218 }
219 #endif
220
221 for (;;) {
222 state = s->state;
223
224 switch (s->state) {
225 case SSL_ST_RENEGOTIATE:
226 s->renegotiate = 1;
227 s->state = SSL_ST_CONNECT;
228 s->ctx->stats.sess_connect_renegotiate++;
229 /* break */
230 case SSL_ST_BEFORE:
231 case SSL_ST_CONNECT:
232 case SSL_ST_BEFORE | SSL_ST_CONNECT:
233 case SSL_ST_OK | SSL_ST_CONNECT:
234
235 s->server = 0;
236 if (cb != NULL)
237 cb(s, SSL_CB_HANDSHAKE_START, 1);
238
239 if ((s->version & 0xff00) != 0x0300) {
240 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
241 s->state = SSL_ST_ERR;
242 ret = -1;
243 goto end;
244 }
245
246 /* s->version=SSL3_VERSION; */
247 s->type = SSL_ST_CONNECT;
248
249 if (s->init_buf == NULL) {
250 if ((buf = BUF_MEM_new()) == NULL) {
251 ret = -1;
252 s->state = SSL_ST_ERR;
253 goto end;
254 }
255 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
256 ret = -1;
257 s->state = SSL_ST_ERR;
258 goto end;
259 }
260 s->init_buf = buf;
261 buf = NULL;
262 }
263
264 if (!ssl3_setup_buffers(s)) {
265 ret = -1;
266 goto end;
267 }
268
269 /* setup buffing BIO */
270 if (!ssl_init_wbio_buffer(s, 0)) {
271 ret = -1;
272 s->state = SSL_ST_ERR;
273 goto end;
274 }
275
276 /* don't push the buffering BIO quite yet */
277
278 ssl3_init_finished_mac(s);
279
280 s->state = SSL3_ST_CW_CLNT_HELLO_A;
281 s->ctx->stats.sess_connect++;
282 s->init_num = 0;
283 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
284 /*
285 * Should have been reset by ssl3_get_finished, too.
286 */
287 s->s3->change_cipher_spec = 0;
288 break;
289
290 case SSL3_ST_CW_CLNT_HELLO_A:
291 case SSL3_ST_CW_CLNT_HELLO_B:
292
293 s->shutdown = 0;
294 ret = ssl3_client_hello(s);
295 if (ret <= 0)
296 goto end;
297 s->state = SSL3_ST_CR_SRVR_HELLO_A;
298 s->init_num = 0;
299
300 /* turn on buffering for the next lot of output */
301 if (s->bbio != s->wbio)
302 s->wbio = BIO_push(s->bbio, s->wbio);
303
304 break;
305
306 case SSL3_ST_CR_SRVR_HELLO_A:
307 case SSL3_ST_CR_SRVR_HELLO_B:
308 ret = ssl3_get_server_hello(s);
309 if (ret <= 0)
310 goto end;
311
312 if (s->hit) {
313 s->state = SSL3_ST_CR_FINISHED_A;
314 #ifndef OPENSSL_NO_TLSEXT
315 if (s->tlsext_ticket_expected) {
316 /* receive renewed session ticket */
317 s->state = SSL3_ST_CR_SESSION_TICKET_A;
318 }
319 #endif
320 } else {
321 s->state = SSL3_ST_CR_CERT_A;
322 }
323 s->init_num = 0;
324 break;
325 case SSL3_ST_CR_CERT_A:
326 case SSL3_ST_CR_CERT_B:
327 #ifndef OPENSSL_NO_TLSEXT
328 /* Noop (ret = 0) for everything but EAP-FAST. */
329 ret = ssl3_check_finished(s);
330 if (ret < 0)
331 goto end;
332 if (ret == 1) {
333 s->hit = 1;
334 s->state = SSL3_ST_CR_FINISHED_A;
335 s->init_num = 0;
336 break;
337 }
338 #endif
339 /* Check if it is anon DH/ECDH, SRP auth */
340 /* or PSK */
341 if (!
342 (s->s3->tmp.
343 new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
344 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
345 ret = ssl3_get_server_certificate(s);
346 if (ret <= 0)
347 goto end;
348 #ifndef OPENSSL_NO_TLSEXT
349 if (s->tlsext_status_expected)
350 s->state = SSL3_ST_CR_CERT_STATUS_A;
351 else
352 s->state = SSL3_ST_CR_KEY_EXCH_A;
353 } else {
354 skip = 1;
355 s->state = SSL3_ST_CR_KEY_EXCH_A;
356 }
357 #else
358 } else
359 skip = 1;
360
361 s->state = SSL3_ST_CR_KEY_EXCH_A;
362 #endif
363 s->init_num = 0;
364 break;
365
366 case SSL3_ST_CR_KEY_EXCH_A:
367 case SSL3_ST_CR_KEY_EXCH_B:
368 ret = ssl3_get_key_exchange(s);
369 if (ret <= 0)
370 goto end;
371 s->state = SSL3_ST_CR_CERT_REQ_A;
372 s->init_num = 0;
373
374 /*
375 * at this point we check that we have the required stuff from
376 * the server
377 */
378 if (!ssl3_check_cert_and_algorithm(s)) {
379 ret = -1;
380 s->state = SSL_ST_ERR;
381 goto end;
382 }
383 break;
384
385 case SSL3_ST_CR_CERT_REQ_A:
386 case SSL3_ST_CR_CERT_REQ_B:
387 ret = ssl3_get_certificate_request(s);
388 if (ret <= 0)
389 goto end;
390 s->state = SSL3_ST_CR_SRVR_DONE_A;
391 s->init_num = 0;
392 break;
393
394 case SSL3_ST_CR_SRVR_DONE_A:
395 case SSL3_ST_CR_SRVR_DONE_B:
396 ret = ssl3_get_server_done(s);
397 if (ret <= 0)
398 goto end;
399 #ifndef OPENSSL_NO_SRP
400 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
401 if ((ret = SRP_Calc_A_param(s)) <= 0) {
402 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_SRP_A_CALC);
403 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
404 s->state = SSL_ST_ERR;
405 goto end;
406 }
407 }
408 #endif
409 if (s->s3->tmp.cert_req)
410 s->state = SSL3_ST_CW_CERT_A;
411 else
412 s->state = SSL3_ST_CW_KEY_EXCH_A;
413 s->init_num = 0;
414
415 break;
416
417 case SSL3_ST_CW_CERT_A:
418 case SSL3_ST_CW_CERT_B:
419 case SSL3_ST_CW_CERT_C:
420 case SSL3_ST_CW_CERT_D:
421 ret = ssl3_send_client_certificate(s);
422 if (ret <= 0)
423 goto end;
424 s->state = SSL3_ST_CW_KEY_EXCH_A;
425 s->init_num = 0;
426 break;
427
428 case SSL3_ST_CW_KEY_EXCH_A:
429 case SSL3_ST_CW_KEY_EXCH_B:
430 ret = ssl3_send_client_key_exchange(s);
431 if (ret <= 0)
432 goto end;
433 /*
434 * EAY EAY EAY need to check for DH fix cert sent back
435 */
436 /*
437 * For TLS, cert_req is set to 2, so a cert chain of nothing is
438 * sent, but no verify packet is sent
439 */
440 /*
441 * XXX: For now, we do not support client authentication in ECDH
442 * cipher suites with ECDH (rather than ECDSA) certificates. We
443 * need to skip the certificate verify message when client's
444 * ECDH public key is sent inside the client certificate.
445 */
446 if (s->s3->tmp.cert_req == 1) {
447 s->state = SSL3_ST_CW_CERT_VRFY_A;
448 } else {
449 s->state = SSL3_ST_CW_CHANGE_A;
450 }
451 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
452 s->state = SSL3_ST_CW_CHANGE_A;
453 }
454
455 s->init_num = 0;
456 break;
457
458 case SSL3_ST_CW_CERT_VRFY_A:
459 case SSL3_ST_CW_CERT_VRFY_B:
460 ret = ssl3_send_client_verify(s);
461 if (ret <= 0)
462 goto end;
463 s->state = SSL3_ST_CW_CHANGE_A;
464 s->init_num = 0;
465 break;
466
467 case SSL3_ST_CW_CHANGE_A:
468 case SSL3_ST_CW_CHANGE_B:
469 ret = ssl3_send_change_cipher_spec(s,
470 SSL3_ST_CW_CHANGE_A,
471 SSL3_ST_CW_CHANGE_B);
472 if (ret <= 0)
473 goto end;
474
475 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
476 s->state = SSL3_ST_CW_FINISHED_A;
477 #else
478 if (s->s3->next_proto_neg_seen)
479 s->state = SSL3_ST_CW_NEXT_PROTO_A;
480 else
481 s->state = SSL3_ST_CW_FINISHED_A;
482 #endif
483 s->init_num = 0;
484
485 s->session->cipher = s->s3->tmp.new_cipher;
486 #ifdef OPENSSL_NO_COMP
487 s->session->compress_meth = 0;
488 #else
489 if (s->s3->tmp.new_compression == NULL)
490 s->session->compress_meth = 0;
491 else
492 s->session->compress_meth = s->s3->tmp.new_compression->id;
493 #endif
494 if (!s->method->ssl3_enc->setup_key_block(s)) {
495 ret = -1;
496 s->state = SSL_ST_ERR;
497 goto end;
498 }
499
500 if (!s->method->ssl3_enc->change_cipher_state(s,
501 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
502 {
503 ret = -1;
504 s->state = SSL_ST_ERR;
505 goto end;
506 }
507
508 break;
509
510 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
511 case SSL3_ST_CW_NEXT_PROTO_A:
512 case SSL3_ST_CW_NEXT_PROTO_B:
513 ret = ssl3_send_next_proto(s);
514 if (ret <= 0)
515 goto end;
516 s->state = SSL3_ST_CW_FINISHED_A;
517 break;
518 #endif
519
520 case SSL3_ST_CW_FINISHED_A:
521 case SSL3_ST_CW_FINISHED_B:
522 ret = ssl3_send_finished(s,
523 SSL3_ST_CW_FINISHED_A,
524 SSL3_ST_CW_FINISHED_B,
525 s->method->
526 ssl3_enc->client_finished_label,
527 s->method->
528 ssl3_enc->client_finished_label_len);
529 if (ret <= 0)
530 goto end;
531 s->state = SSL3_ST_CW_FLUSH;
532
533 /* clear flags */
534 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
535 if (s->hit) {
536 s->s3->tmp.next_state = SSL_ST_OK;
537 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
538 s->state = SSL_ST_OK;
539 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
540 s->s3->delay_buf_pop_ret = 0;
541 }
542 } else {
543 #ifndef OPENSSL_NO_TLSEXT
544 /*
545 * Allow NewSessionTicket if ticket expected
546 */
547 if (s->tlsext_ticket_expected)
548 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
549 else
550 #endif
551
552 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
553 }
554 s->init_num = 0;
555 break;
556
557 #ifndef OPENSSL_NO_TLSEXT
558 case SSL3_ST_CR_SESSION_TICKET_A:
559 case SSL3_ST_CR_SESSION_TICKET_B:
560 ret = ssl3_get_new_session_ticket(s);
561 if (ret <= 0)
562 goto end;
563 s->state = SSL3_ST_CR_FINISHED_A;
564 s->init_num = 0;
565 break;
566
567 case SSL3_ST_CR_CERT_STATUS_A:
568 case SSL3_ST_CR_CERT_STATUS_B:
569 ret = ssl3_get_cert_status(s);
570 if (ret <= 0)
571 goto end;
572 s->state = SSL3_ST_CR_KEY_EXCH_A;
573 s->init_num = 0;
574 break;
575 #endif
576
577 case SSL3_ST_CR_FINISHED_A:
578 case SSL3_ST_CR_FINISHED_B:
579 if (!s->s3->change_cipher_spec)
580 s->s3->flags |= SSL3_FLAGS_CCS_OK;
581 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
582 SSL3_ST_CR_FINISHED_B);
583 if (ret <= 0)
584 goto end;
585
586 if (s->hit)
587 s->state = SSL3_ST_CW_CHANGE_A;
588 else
589 s->state = SSL_ST_OK;
590 s->init_num = 0;
591 break;
592
593 case SSL3_ST_CW_FLUSH:
594 s->rwstate = SSL_WRITING;
595 if (BIO_flush(s->wbio) <= 0) {
596 ret = -1;
597 goto end;
598 }
599 s->rwstate = SSL_NOTHING;
600 s->state = s->s3->tmp.next_state;
601 break;
602
603 case SSL_ST_OK:
604 /* clean a few things up */
605 ssl3_cleanup_key_block(s);
606
607 if (s->init_buf != NULL) {
608 BUF_MEM_free(s->init_buf);
609 s->init_buf = NULL;
610 }
611
612 /*
613 * If we are not 'joining' the last two packets, remove the
614 * buffering now
615 */
616 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
617 ssl_free_wbio_buffer(s);
618 /* else do it later in ssl3_write */
619
620 s->init_num = 0;
621 s->renegotiate = 0;
622 s->new_session = 0;
623
624 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
625 if (s->hit)
626 s->ctx->stats.sess_hit++;
627
628 ret = 1;
629 /* s->server=0; */
630 s->handshake_func = ssl3_connect;
631 s->ctx->stats.sess_connect_good++;
632
633 if (cb != NULL)
634 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
635
636 goto end;
637 /* break; */
638
639 case SSL_ST_ERR:
640 default:
641 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_UNKNOWN_STATE);
642 ret = -1;
643 goto end;
644 /* break; */
645 }
646
647 /* did we do anything */
648 if (!s->s3->tmp.reuse_message && !skip) {
649 if (s->debug) {
650 if ((ret = BIO_flush(s->wbio)) <= 0)
651 goto end;
652 }
653
654 if ((cb != NULL) && (s->state != state)) {
655 new_state = s->state;
656 s->state = state;
657 cb(s, SSL_CB_CONNECT_LOOP, 1);
658 s->state = new_state;
659 }
660 }
661 skip = 0;
662 }
663 end:
664 s->in_handshake--;
665 if (buf != NULL)
666 BUF_MEM_free(buf);
667 if (cb != NULL)
668 cb(s, SSL_CB_CONNECT_EXIT, ret);
669 return (ret);
670 }
671
ssl3_client_hello(SSL * s)672 int ssl3_client_hello(SSL *s)
673 {
674 unsigned char *buf;
675 unsigned char *p, *d;
676 int i;
677 unsigned long l;
678 int al = 0;
679 #ifndef OPENSSL_NO_COMP
680 int j;
681 SSL_COMP *comp;
682 #endif
683
684 buf = (unsigned char *)s->init_buf->data;
685 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
686 SSL_SESSION *sess = s->session;
687 if ((sess == NULL) || (sess->ssl_version != s->version) ||
688 #ifdef OPENSSL_NO_TLSEXT
689 !sess->session_id_length ||
690 #else
691 /*
692 * In the case of EAP-FAST, we can have a pre-shared
693 * "ticket" without a session ID.
694 */
695 (!sess->session_id_length && !sess->tlsext_tick) ||
696 #endif
697 (sess->not_resumable)) {
698 if (!ssl_get_new_session(s, 0))
699 goto err;
700 }
701 if (s->method->version == DTLS_ANY_VERSION) {
702 /* Determine which DTLS version to use */
703 int options = s->options;
704 /* If DTLS 1.2 disabled correct the version number */
705 if (options & SSL_OP_NO_DTLSv1_2) {
706 if (tls1_suiteb(s)) {
707 SSLerr(SSL_F_SSL3_CLIENT_HELLO,
708 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
709 goto err;
710 }
711 /*
712 * Disabling all versions is silly: return an error.
713 */
714 if (options & SSL_OP_NO_DTLSv1) {
715 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_WRONG_SSL_VERSION);
716 goto err;
717 }
718 /*
719 * Update method so we don't use any DTLS 1.2 features.
720 */
721 s->method = DTLSv1_client_method();
722 s->version = DTLS1_VERSION;
723 } else {
724 /*
725 * We only support one version: update method
726 */
727 if (options & SSL_OP_NO_DTLSv1)
728 s->method = DTLSv1_2_client_method();
729 s->version = DTLS1_2_VERSION;
730 }
731 s->client_version = s->version;
732 }
733 /* else use the pre-loaded session */
734
735 p = s->s3->client_random;
736
737 /*
738 * for DTLS if client_random is initialized, reuse it, we are
739 * required to use same upon reply to HelloVerify
740 */
741 if (SSL_IS_DTLS(s)) {
742 size_t idx;
743 i = 1;
744 for (idx = 0; idx < sizeof(s->s3->client_random); idx++) {
745 if (p[idx]) {
746 i = 0;
747 break;
748 }
749 }
750 } else
751 i = 1;
752
753 if (i && ssl_fill_hello_random(s, 0, p,
754 sizeof(s->s3->client_random)) <= 0)
755 goto err;
756
757 /* Do the message type and length last */
758 d = p = ssl_handshake_start(s);
759
760 /*-
761 * version indicates the negotiated version: for example from
762 * an SSLv2/v3 compatible client hello). The client_version
763 * field is the maximum version we permit and it is also
764 * used in RSA encrypted premaster secrets. Some servers can
765 * choke if we initially report a higher version then
766 * renegotiate to a lower one in the premaster secret. This
767 * didn't happen with TLS 1.0 as most servers supported it
768 * but it can with TLS 1.1 or later if the server only supports
769 * 1.0.
770 *
771 * Possible scenario with previous logic:
772 * 1. Client hello indicates TLS 1.2
773 * 2. Server hello says TLS 1.0
774 * 3. RSA encrypted premaster secret uses 1.2.
775 * 4. Handhaked proceeds using TLS 1.0.
776 * 5. Server sends hello request to renegotiate.
777 * 6. Client hello indicates TLS v1.0 as we now
778 * know that is maximum server supports.
779 * 7. Server chokes on RSA encrypted premaster secret
780 * containing version 1.0.
781 *
782 * For interoperability it should be OK to always use the
783 * maximum version we support in client hello and then rely
784 * on the checking of version to ensure the servers isn't
785 * being inconsistent: for example initially negotiating with
786 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
787 * client_version in client hello and not resetting it to
788 * the negotiated version.
789 */
790 #if 0
791 *(p++) = s->version >> 8;
792 *(p++) = s->version & 0xff;
793 s->client_version = s->version;
794 #else
795 *(p++) = s->client_version >> 8;
796 *(p++) = s->client_version & 0xff;
797 #endif
798
799 /* Random stuff */
800 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
801 p += SSL3_RANDOM_SIZE;
802
803 /* Session ID */
804 if (s->new_session)
805 i = 0;
806 else
807 i = s->session->session_id_length;
808 *(p++) = i;
809 if (i != 0) {
810 if (i > (int)sizeof(s->session->session_id)) {
811 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
812 goto err;
813 }
814 memcpy(p, s->session->session_id, i);
815 p += i;
816 }
817
818 /* cookie stuff for DTLS */
819 if (SSL_IS_DTLS(s)) {
820 if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
821 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
822 goto err;
823 }
824 *(p++) = s->d1->cookie_len;
825 memcpy(p, s->d1->cookie, s->d1->cookie_len);
826 p += s->d1->cookie_len;
827 }
828
829 /* Ciphers supported */
830 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
831 if (i == 0) {
832 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
833 goto err;
834 }
835 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
836 /*
837 * Some servers hang if client hello > 256 bytes as hack workaround
838 * chop number of supported ciphers to keep it well below this if we
839 * use TLS v1.2
840 */
841 if (TLS1_get_version(s) >= TLS1_2_VERSION
842 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
843 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
844 #endif
845 s2n(i, p);
846 p += i;
847
848 /* COMPRESSION */
849 #ifdef OPENSSL_NO_COMP
850 *(p++) = 1;
851 #else
852
853 if ((s->options & SSL_OP_NO_COMPRESSION)
854 || !s->ctx->comp_methods)
855 j = 0;
856 else
857 j = sk_SSL_COMP_num(s->ctx->comp_methods);
858 *(p++) = 1 + j;
859 for (i = 0; i < j; i++) {
860 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
861 *(p++) = comp->id;
862 }
863 #endif
864 *(p++) = 0; /* Add the NULL method */
865
866 #ifndef OPENSSL_NO_TLSEXT
867 /* TLS extensions */
868 if (ssl_prepare_clienthello_tlsext(s) <= 0) {
869 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
870 goto err;
871 }
872 if ((p =
873 ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
874 &al)) == NULL) {
875 ssl3_send_alert(s, SSL3_AL_FATAL, al);
876 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
877 goto err;
878 }
879 #endif
880
881 l = p - d;
882 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
883 s->state = SSL3_ST_CW_CLNT_HELLO_B;
884 }
885
886 /* SSL3_ST_CW_CLNT_HELLO_B */
887 return ssl_do_write(s);
888 err:
889 s->state = SSL_ST_ERR;
890 return (-1);
891 }
892
ssl3_get_server_hello(SSL * s)893 int ssl3_get_server_hello(SSL *s)
894 {
895 STACK_OF(SSL_CIPHER) *sk;
896 const SSL_CIPHER *c;
897 CERT *ct = s->cert;
898 unsigned char *p, *d;
899 int i, al = SSL_AD_INTERNAL_ERROR, ok;
900 unsigned int j;
901 long n;
902 #ifndef OPENSSL_NO_COMP
903 SSL_COMP *comp;
904 #endif
905 /*
906 * Hello verify request and/or server hello version may not match so set
907 * first packet if we're negotiating version.
908 */
909 if (SSL_IS_DTLS(s))
910 s->first_packet = 1;
911
912 n = s->method->ssl_get_message(s,
913 SSL3_ST_CR_SRVR_HELLO_A,
914 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok);
915
916 if (!ok)
917 return ((int)n);
918
919 if (SSL_IS_DTLS(s)) {
920 s->first_packet = 0;
921 if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
922 if (s->d1->send_cookie == 0) {
923 s->s3->tmp.reuse_message = 1;
924 return 1;
925 } else { /* already sent a cookie */
926
927 al = SSL_AD_UNEXPECTED_MESSAGE;
928 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
929 goto f_err;
930 }
931 }
932 }
933
934 if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) {
935 al = SSL_AD_UNEXPECTED_MESSAGE;
936 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
937 goto f_err;
938 }
939
940 d = p = (unsigned char *)s->init_msg;
941 if (s->method->version == DTLS_ANY_VERSION) {
942 /* Work out correct protocol version to use */
943 int hversion = (p[0] << 8) | p[1];
944 int options = s->options;
945 if (hversion == DTLS1_2_VERSION && !(options & SSL_OP_NO_DTLSv1_2))
946 s->method = DTLSv1_2_client_method();
947 else if (tls1_suiteb(s)) {
948 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
949 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
950 s->version = hversion;
951 al = SSL_AD_PROTOCOL_VERSION;
952 goto f_err;
953 } else if (hversion == DTLS1_VERSION && !(options & SSL_OP_NO_DTLSv1))
954 s->method = DTLSv1_client_method();
955 else {
956 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
957 s->version = hversion;
958 al = SSL_AD_PROTOCOL_VERSION;
959 goto f_err;
960 }
961 s->session->ssl_version = s->version = s->method->version;
962 }
963
964 if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) {
965 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
966 s->version = (s->version & 0xff00) | p[1];
967 al = SSL_AD_PROTOCOL_VERSION;
968 goto f_err;
969 }
970 p += 2;
971
972 /* load the server hello data */
973 /* load the server random */
974 memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE);
975 p += SSL3_RANDOM_SIZE;
976
977 s->hit = 0;
978
979 /* get the session-id */
980 j = *(p++);
981
982 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) {
983 al = SSL_AD_ILLEGAL_PARAMETER;
984 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG);
985 goto f_err;
986 }
987 #ifndef OPENSSL_NO_TLSEXT
988 /*
989 * Check if we can resume the session based on external pre-shared secret.
990 * EAP-FAST (RFC 4851) supports two types of session resumption.
991 * Resumption based on server-side state works with session IDs.
992 * Resumption based on pre-shared Protected Access Credentials (PACs)
993 * works by overriding the SessionTicket extension at the application
994 * layer, and does not send a session ID. (We do not know whether EAP-FAST
995 * servers would honour the session ID.) Therefore, the session ID alone
996 * is not a reliable indicator of session resumption, so we first check if
997 * we can resume, and later peek at the next handshake message to see if the
998 * server wants to resume.
999 */
1000 if (s->version >= TLS1_VERSION && s->tls_session_secret_cb &&
1001 s->session->tlsext_tick) {
1002 SSL_CIPHER *pref_cipher = NULL;
1003 s->session->master_key_length = sizeof(s->session->master_key);
1004 if (s->tls_session_secret_cb(s, s->session->master_key,
1005 &s->session->master_key_length,
1006 NULL, &pref_cipher,
1007 s->tls_session_secret_cb_arg)) {
1008 s->session->cipher = pref_cipher ?
1009 pref_cipher : ssl_get_cipher_by_char(s, p + j);
1010 } else {
1011 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1012 al = SSL_AD_INTERNAL_ERROR;
1013 goto f_err;
1014 }
1015 }
1016 #endif /* OPENSSL_NO_TLSEXT */
1017
1018 if (j != 0 && j == s->session->session_id_length
1019 && memcmp(p, s->session->session_id, j) == 0) {
1020 if (s->sid_ctx_length != s->session->sid_ctx_length
1021 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
1022 /* actually a client application bug */
1023 al = SSL_AD_ILLEGAL_PARAMETER;
1024 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1025 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1026 goto f_err;
1027 }
1028 s->hit = 1;
1029 } else {
1030 /*
1031 * If we were trying for session-id reuse but the server
1032 * didn't echo the ID, make a new SSL_SESSION.
1033 * In the case of EAP-FAST and PAC, we do not send a session ID,
1034 * so the PAC-based session secret is always preserved. It'll be
1035 * overwritten if the server refuses resumption.
1036 */
1037 if (s->session->session_id_length > 0) {
1038 if (!ssl_get_new_session(s, 0)) {
1039 goto f_err;
1040 }
1041 }
1042 s->session->session_id_length = j;
1043 memcpy(s->session->session_id, p, j); /* j could be 0 */
1044 }
1045 p += j;
1046 c = ssl_get_cipher_by_char(s, p);
1047 if (c == NULL) {
1048 /* unknown cipher */
1049 al = SSL_AD_ILLEGAL_PARAMETER;
1050 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED);
1051 goto f_err;
1052 }
1053 /* Set version disabled mask now we know version */
1054 if (!SSL_USE_TLS1_2_CIPHERS(s))
1055 ct->mask_ssl = SSL_TLSV1_2;
1056 else
1057 ct->mask_ssl = 0;
1058 /*
1059 * If it is a disabled cipher we didn't send it in client hello, so
1060 * return an error.
1061 */
1062 if (c->algorithm_ssl & ct->mask_ssl ||
1063 c->algorithm_mkey & ct->mask_k || c->algorithm_auth & ct->mask_a) {
1064 al = SSL_AD_ILLEGAL_PARAMETER;
1065 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1066 goto f_err;
1067 }
1068 p += ssl_put_cipher_by_char(s, NULL, NULL);
1069
1070 sk = ssl_get_ciphers_by_id(s);
1071 i = sk_SSL_CIPHER_find(sk, c);
1072 if (i < 0) {
1073 /* we did not say we would use this cipher */
1074 al = SSL_AD_ILLEGAL_PARAMETER;
1075 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
1076 goto f_err;
1077 }
1078
1079 /*
1080 * Depending on the session caching (internal/external), the cipher
1081 * and/or cipher_id values may not be set. Make sure that cipher_id is
1082 * set and use it for comparison.
1083 */
1084 if (s->session->cipher)
1085 s->session->cipher_id = s->session->cipher->id;
1086 if (s->hit && (s->session->cipher_id != c->id)) {
1087 /* Workaround is now obsolete */
1088 #if 0
1089 if (!(s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1090 #endif
1091 {
1092 al = SSL_AD_ILLEGAL_PARAMETER;
1093 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1094 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1095 goto f_err;
1096 }
1097 }
1098 s->s3->tmp.new_cipher = c;
1099 /*
1100 * Don't digest cached records if no sigalgs: we may need them for client
1101 * authentication.
1102 */
1103 if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1104 goto f_err;
1105 /* lets get the compression algorithm */
1106 /* COMPRESSION */
1107 #ifdef OPENSSL_NO_COMP
1108 if (*(p++) != 0) {
1109 al = SSL_AD_ILLEGAL_PARAMETER;
1110 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1111 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1112 goto f_err;
1113 }
1114 /*
1115 * If compression is disabled we'd better not try to resume a session
1116 * using compression.
1117 */
1118 if (s->session->compress_meth != 0) {
1119 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
1120 goto f_err;
1121 }
1122 #else
1123 j = *(p++);
1124 if (s->hit && j != s->session->compress_meth) {
1125 al = SSL_AD_ILLEGAL_PARAMETER;
1126 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1127 SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1128 goto f_err;
1129 }
1130 if (j == 0)
1131 comp = NULL;
1132 else if (s->options & SSL_OP_NO_COMPRESSION) {
1133 al = SSL_AD_ILLEGAL_PARAMETER;
1134 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED);
1135 goto f_err;
1136 } else
1137 comp = ssl3_comp_find(s->ctx->comp_methods, j);
1138
1139 if ((j != 0) && (comp == NULL)) {
1140 al = SSL_AD_ILLEGAL_PARAMETER;
1141 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
1142 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1143 goto f_err;
1144 } else {
1145 s->s3->tmp.new_compression = comp;
1146 }
1147 #endif
1148
1149 #ifndef OPENSSL_NO_TLSEXT
1150 /* TLS extensions */
1151 if (!ssl_parse_serverhello_tlsext(s, &p, d, n)) {
1152 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT);
1153 goto err;
1154 }
1155 #endif
1156
1157 if (p != (d + n)) {
1158 /* wrong packet length */
1159 al = SSL_AD_DECODE_ERROR;
1160 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH);
1161 goto f_err;
1162 }
1163
1164 return (1);
1165 f_err:
1166 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1167 err:
1168 s->state = SSL_ST_ERR;
1169 return (-1);
1170 }
1171
ssl3_get_server_certificate(SSL * s)1172 int ssl3_get_server_certificate(SSL *s)
1173 {
1174 int al, i, ok, ret = -1;
1175 unsigned long n, nc, llen, l;
1176 X509 *x = NULL;
1177 const unsigned char *q, *p;
1178 unsigned char *d;
1179 STACK_OF(X509) *sk = NULL;
1180 SESS_CERT *sc;
1181 EVP_PKEY *pkey = NULL;
1182 int need_cert = 1; /* VRS: 0=> will allow null cert if auth ==
1183 * KRB5 */
1184
1185 n = s->method->ssl_get_message(s,
1186 SSL3_ST_CR_CERT_A,
1187 SSL3_ST_CR_CERT_B,
1188 -1, s->max_cert_list, &ok);
1189
1190 if (!ok)
1191 return ((int)n);
1192
1193 if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1194 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1195 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE))) {
1196 s->s3->tmp.reuse_message = 1;
1197 return (1);
1198 }
1199
1200 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
1201 al = SSL_AD_UNEXPECTED_MESSAGE;
1202 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE);
1203 goto f_err;
1204 }
1205 p = d = (unsigned char *)s->init_msg;
1206
1207 if ((sk = sk_X509_new_null()) == NULL) {
1208 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1209 goto err;
1210 }
1211
1212 n2l3(p, llen);
1213 if (llen + 3 != n) {
1214 al = SSL_AD_DECODE_ERROR;
1215 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
1216 goto f_err;
1217 }
1218 for (nc = 0; nc < llen;) {
1219 n2l3(p, l);
1220 if ((l + nc + 3) > llen) {
1221 al = SSL_AD_DECODE_ERROR;
1222 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1223 SSL_R_CERT_LENGTH_MISMATCH);
1224 goto f_err;
1225 }
1226
1227 q = p;
1228 x = d2i_X509(NULL, &q, l);
1229 if (x == NULL) {
1230 al = SSL_AD_BAD_CERTIFICATE;
1231 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB);
1232 goto f_err;
1233 }
1234 if (q != (p + l)) {
1235 al = SSL_AD_DECODE_ERROR;
1236 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1237 SSL_R_CERT_LENGTH_MISMATCH);
1238 goto f_err;
1239 }
1240 if (!sk_X509_push(sk, x)) {
1241 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
1242 goto err;
1243 }
1244 x = NULL;
1245 nc += l + 3;
1246 p = q;
1247 }
1248
1249 i = ssl_verify_cert_chain(s, sk);
1250 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1251 #ifndef OPENSSL_NO_KRB5
1252 && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1253 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1254 #endif /* OPENSSL_NO_KRB5 */
1255 ) {
1256 al = ssl_verify_alarm_type(s->verify_result);
1257 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1258 SSL_R_CERTIFICATE_VERIFY_FAILED);
1259 goto f_err;
1260 }
1261 ERR_clear_error(); /* but we keep s->verify_result */
1262
1263 sc = ssl_sess_cert_new();
1264 if (sc == NULL)
1265 goto err;
1266
1267 if (s->session->sess_cert)
1268 ssl_sess_cert_free(s->session->sess_cert);
1269 s->session->sess_cert = sc;
1270
1271 sc->cert_chain = sk;
1272 /*
1273 * Inconsistency alert: cert_chain does include the peer's certificate,
1274 * which we don't include in s3_srvr.c
1275 */
1276 x = sk_X509_value(sk, 0);
1277 sk = NULL;
1278 /*
1279 * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end
1280 */
1281
1282 pkey = X509_get_pubkey(x);
1283
1284 /* VRS: allow null cert if auth == KRB5 */
1285 need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1286 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1287 ? 0 : 1;
1288
1289 #ifdef KSSL_DEBUG
1290 fprintf(stderr, "pkey,x = %p, %p\n", pkey, x);
1291 fprintf(stderr, "ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x, pkey));
1292 fprintf(stderr, "cipher, alg, nc = %s, %lx, %lx, %d\n",
1293 s->s3->tmp.new_cipher->name,
1294 s->s3->tmp.new_cipher->algorithm_mkey,
1295 s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1296 #endif /* KSSL_DEBUG */
1297
1298 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))) {
1299 x = NULL;
1300 al = SSL3_AL_FATAL;
1301 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1302 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1303 goto f_err;
1304 }
1305
1306 i = ssl_cert_type(x, pkey);
1307 if (need_cert && i < 0) {
1308 x = NULL;
1309 al = SSL3_AL_FATAL;
1310 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1311 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1312 goto f_err;
1313 }
1314
1315 if (need_cert) {
1316 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1317 if (exp_idx >= 0 && i != exp_idx) {
1318 x = NULL;
1319 al = SSL_AD_ILLEGAL_PARAMETER;
1320 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1321 SSL_R_WRONG_CERTIFICATE_TYPE);
1322 goto f_err;
1323 }
1324 sc->peer_cert_type = i;
1325 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1326 /*
1327 * Why would the following ever happen? We just created sc a couple
1328 * of lines ago.
1329 */
1330 if (sc->peer_pkeys[i].x509 != NULL)
1331 X509_free(sc->peer_pkeys[i].x509);
1332 sc->peer_pkeys[i].x509 = x;
1333 sc->peer_key = &(sc->peer_pkeys[i]);
1334
1335 if (s->session->peer != NULL)
1336 X509_free(s->session->peer);
1337 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1338 s->session->peer = x;
1339 } else {
1340 sc->peer_cert_type = i;
1341 sc->peer_key = NULL;
1342
1343 if (s->session->peer != NULL)
1344 X509_free(s->session->peer);
1345 s->session->peer = NULL;
1346 }
1347 s->session->verify_result = s->verify_result;
1348
1349 x = NULL;
1350 ret = 1;
1351 if (0) {
1352 f_err:
1353 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1354 err:
1355 s->state = SSL_ST_ERR;
1356 }
1357
1358 EVP_PKEY_free(pkey);
1359 X509_free(x);
1360 sk_X509_pop_free(sk, X509_free);
1361 return (ret);
1362 }
1363
ssl3_get_key_exchange(SSL * s)1364 int ssl3_get_key_exchange(SSL *s)
1365 {
1366 #ifndef OPENSSL_NO_RSA
1367 unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2];
1368 #endif
1369 EVP_MD_CTX md_ctx;
1370 unsigned char *param, *p;
1371 int al, j, ok;
1372 long i, param_len, n, alg_k, alg_a;
1373 EVP_PKEY *pkey = NULL;
1374 const EVP_MD *md = NULL;
1375 #ifndef OPENSSL_NO_RSA
1376 RSA *rsa = NULL;
1377 #endif
1378 #ifndef OPENSSL_NO_DH
1379 DH *dh = NULL;
1380 #endif
1381 #ifndef OPENSSL_NO_ECDH
1382 EC_KEY *ecdh = NULL;
1383 BN_CTX *bn_ctx = NULL;
1384 EC_POINT *srvr_ecpoint = NULL;
1385 int curve_nid = 0;
1386 int encoded_pt_len = 0;
1387 #endif
1388
1389 EVP_MD_CTX_init(&md_ctx);
1390
1391 /*
1392 * use same message size as in ssl3_get_certificate_request() as
1393 * ServerKeyExchange message may be skipped
1394 */
1395 n = s->method->ssl_get_message(s,
1396 SSL3_ST_CR_KEY_EXCH_A,
1397 SSL3_ST_CR_KEY_EXCH_B,
1398 -1, s->max_cert_list, &ok);
1399 if (!ok)
1400 return ((int)n);
1401
1402 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1403
1404 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1405 /*
1406 * Can't skip server key exchange if this is an ephemeral
1407 * ciphersuite.
1408 */
1409 if (alg_k & (SSL_kDHE | SSL_kECDHE)) {
1410 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1411 al = SSL_AD_UNEXPECTED_MESSAGE;
1412 goto f_err;
1413 }
1414 #ifndef OPENSSL_NO_PSK
1415 /*
1416 * In plain PSK ciphersuite, ServerKeyExchange can be omitted if no
1417 * identity hint is sent. Set session->sess_cert anyway to avoid
1418 * problems later.
1419 */
1420 if (alg_k & SSL_kPSK) {
1421 s->session->sess_cert = ssl_sess_cert_new();
1422 if (s->ctx->psk_identity_hint)
1423 OPENSSL_free(s->ctx->psk_identity_hint);
1424 s->ctx->psk_identity_hint = NULL;
1425 }
1426 #endif
1427 s->s3->tmp.reuse_message = 1;
1428 return (1);
1429 }
1430
1431 param = p = (unsigned char *)s->init_msg;
1432 if (s->session->sess_cert != NULL) {
1433 #ifndef OPENSSL_NO_RSA
1434 if (s->session->sess_cert->peer_rsa_tmp != NULL) {
1435 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1436 s->session->sess_cert->peer_rsa_tmp = NULL;
1437 }
1438 #endif
1439 #ifndef OPENSSL_NO_DH
1440 if (s->session->sess_cert->peer_dh_tmp) {
1441 DH_free(s->session->sess_cert->peer_dh_tmp);
1442 s->session->sess_cert->peer_dh_tmp = NULL;
1443 }
1444 #endif
1445 #ifndef OPENSSL_NO_ECDH
1446 if (s->session->sess_cert->peer_ecdh_tmp) {
1447 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1448 s->session->sess_cert->peer_ecdh_tmp = NULL;
1449 }
1450 #endif
1451 } else {
1452 s->session->sess_cert = ssl_sess_cert_new();
1453 }
1454
1455 /* Total length of the parameters including the length prefix */
1456 param_len = 0;
1457
1458 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1459
1460 al = SSL_AD_DECODE_ERROR;
1461
1462 #ifndef OPENSSL_NO_PSK
1463 if (alg_k & SSL_kPSK) {
1464 param_len = 2;
1465 if (param_len > n) {
1466 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1467 goto f_err;
1468 }
1469 n2s(p, i);
1470
1471 /*
1472 * Store PSK identity hint for later use, hint is used in
1473 * ssl3_send_client_key_exchange. Assume that the maximum length of
1474 * a PSK identity hint can be as long as the maximum length of a PSK
1475 * identity.
1476 */
1477 if (i > PSK_MAX_IDENTITY_LEN) {
1478 al = SSL_AD_HANDSHAKE_FAILURE;
1479 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG);
1480 goto f_err;
1481 }
1482 if (i > n - param_len) {
1483 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1484 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1485 goto f_err;
1486 }
1487 param_len += i;
1488
1489 s->session->psk_identity_hint = BUF_strndup((char *)p, i);
1490 if (s->session->psk_identity_hint == NULL) {
1491 al = SSL_AD_HANDSHAKE_FAILURE;
1492 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1493 goto f_err;
1494 }
1495
1496 p += i;
1497 n -= param_len;
1498 } else
1499 #endif /* !OPENSSL_NO_PSK */
1500 #ifndef OPENSSL_NO_SRP
1501 if (alg_k & SSL_kSRP) {
1502 param_len = 2;
1503 if (param_len > n) {
1504 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1505 goto f_err;
1506 }
1507 n2s(p, i);
1508
1509 if (i > n - param_len) {
1510 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_N_LENGTH);
1511 goto f_err;
1512 }
1513 param_len += i;
1514
1515 if (!(s->srp_ctx.N = BN_bin2bn(p, i, NULL))) {
1516 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1517 goto err;
1518 }
1519 p += i;
1520
1521 if (2 > n - param_len) {
1522 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1523 goto f_err;
1524 }
1525 param_len += 2;
1526
1527 n2s(p, i);
1528
1529 if (i > n - param_len) {
1530 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_G_LENGTH);
1531 goto f_err;
1532 }
1533 param_len += i;
1534
1535 if (!(s->srp_ctx.g = BN_bin2bn(p, i, NULL))) {
1536 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1537 goto err;
1538 }
1539 p += i;
1540
1541 if (1 > n - param_len) {
1542 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1543 goto f_err;
1544 }
1545 param_len += 1;
1546
1547 i = (unsigned int)(p[0]);
1548 p++;
1549
1550 if (i > n - param_len) {
1551 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_S_LENGTH);
1552 goto f_err;
1553 }
1554 param_len += i;
1555
1556 if (!(s->srp_ctx.s = BN_bin2bn(p, i, NULL))) {
1557 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1558 goto err;
1559 }
1560 p += i;
1561
1562 if (2 > n - param_len) {
1563 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1564 goto f_err;
1565 }
1566 param_len += 2;
1567
1568 n2s(p, i);
1569
1570 if (i > n - param_len) {
1571 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_B_LENGTH);
1572 goto f_err;
1573 }
1574 param_len += i;
1575
1576 if (!(s->srp_ctx.B = BN_bin2bn(p, i, NULL))) {
1577 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1578 goto err;
1579 }
1580 p += i;
1581 n -= param_len;
1582
1583 if (!srp_verify_server_param(s, &al)) {
1584 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_PARAMETERS);
1585 goto f_err;
1586 }
1587
1588 /* We must check if there is a certificate */
1589 # ifndef OPENSSL_NO_RSA
1590 if (alg_a & SSL_aRSA)
1591 pkey =
1592 X509_get_pubkey(s->session->
1593 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1594 # else
1595 if (0) ;
1596 # endif
1597 # ifndef OPENSSL_NO_DSA
1598 else if (alg_a & SSL_aDSS)
1599 pkey =
1600 X509_get_pubkey(s->session->
1601 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1602 x509);
1603 # endif
1604 } else
1605 #endif /* !OPENSSL_NO_SRP */
1606 #ifndef OPENSSL_NO_RSA
1607 if (alg_k & SSL_kRSA) {
1608 /* Temporary RSA keys only allowed in export ciphersuites */
1609 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
1610 al = SSL_AD_UNEXPECTED_MESSAGE;
1611 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1612 goto f_err;
1613 }
1614 if ((rsa = RSA_new()) == NULL) {
1615 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1616 goto err;
1617 }
1618
1619 param_len = 2;
1620 if (param_len > n) {
1621 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1622 goto f_err;
1623 }
1624 n2s(p, i);
1625
1626 if (i > n - param_len) {
1627 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH);
1628 goto f_err;
1629 }
1630 param_len += i;
1631
1632 if (!(rsa->n = BN_bin2bn(p, i, rsa->n))) {
1633 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1634 goto err;
1635 }
1636 p += i;
1637
1638 if (2 > n - param_len) {
1639 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1640 goto f_err;
1641 }
1642 param_len += 2;
1643
1644 n2s(p, i);
1645
1646 if (i > n - param_len) {
1647 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH);
1648 goto f_err;
1649 }
1650 param_len += i;
1651
1652 if (!(rsa->e = BN_bin2bn(p, i, rsa->e))) {
1653 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1654 goto err;
1655 }
1656 p += i;
1657 n -= param_len;
1658
1659 /* this should be because we are using an export cipher */
1660 if (alg_a & SSL_aRSA)
1661 pkey =
1662 X509_get_pubkey(s->session->
1663 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1664 else {
1665 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1666 goto err;
1667 }
1668
1669 if (EVP_PKEY_bits(pkey) <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
1670 al = SSL_AD_UNEXPECTED_MESSAGE;
1671 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1672 goto f_err;
1673 }
1674
1675 s->session->sess_cert->peer_rsa_tmp = rsa;
1676 rsa = NULL;
1677 }
1678 #else /* OPENSSL_NO_RSA */
1679 if (0) ;
1680 #endif
1681 #ifndef OPENSSL_NO_DH
1682 else if (alg_k & SSL_kEDH) {
1683 if ((dh = DH_new()) == NULL) {
1684 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB);
1685 goto err;
1686 }
1687
1688 param_len = 2;
1689 if (param_len > n) {
1690 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1691 goto f_err;
1692 }
1693 n2s(p, i);
1694
1695 if (i > n - param_len) {
1696 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH);
1697 goto f_err;
1698 }
1699 param_len += i;
1700
1701 if (!(dh->p = BN_bin2bn(p, i, NULL))) {
1702 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1703 goto err;
1704 }
1705 p += i;
1706
1707 if (BN_is_zero(dh->p)) {
1708 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_VALUE);
1709 goto f_err;
1710 }
1711
1712
1713 if (2 > n - param_len) {
1714 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1715 goto f_err;
1716 }
1717 param_len += 2;
1718
1719 n2s(p, i);
1720
1721 if (i > n - param_len) {
1722 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH);
1723 goto f_err;
1724 }
1725 param_len += i;
1726
1727 if (!(dh->g = BN_bin2bn(p, i, NULL))) {
1728 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1729 goto err;
1730 }
1731 p += i;
1732
1733 if (BN_is_zero(dh->g)) {
1734 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_VALUE);
1735 goto f_err;
1736 }
1737
1738 if (2 > n - param_len) {
1739 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1740 goto f_err;
1741 }
1742 param_len += 2;
1743
1744 n2s(p, i);
1745
1746 if (i > n - param_len) {
1747 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH);
1748 goto f_err;
1749 }
1750 param_len += i;
1751
1752 if (!(dh->pub_key = BN_bin2bn(p, i, NULL))) {
1753 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1754 goto err;
1755 }
1756 p += i;
1757 n -= param_len;
1758
1759 if (BN_is_zero(dh->pub_key)) {
1760 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_VALUE);
1761 goto f_err;
1762 }
1763
1764 # ifndef OPENSSL_NO_RSA
1765 if (alg_a & SSL_aRSA)
1766 pkey =
1767 X509_get_pubkey(s->session->
1768 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1769 # else
1770 if (0) ;
1771 # endif
1772 # ifndef OPENSSL_NO_DSA
1773 else if (alg_a & SSL_aDSS)
1774 pkey =
1775 X509_get_pubkey(s->session->
1776 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1777 x509);
1778 # endif
1779 /* else anonymous DH, so no certificate or pkey. */
1780
1781 s->session->sess_cert->peer_dh_tmp = dh;
1782 dh = NULL;
1783 } else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd)) {
1784 al = SSL_AD_ILLEGAL_PARAMETER;
1785 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1786 SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1787 goto f_err;
1788 }
1789 #endif /* !OPENSSL_NO_DH */
1790
1791 #ifndef OPENSSL_NO_ECDH
1792 else if (alg_k & SSL_kEECDH) {
1793 EC_GROUP *ngroup;
1794 const EC_GROUP *group;
1795
1796 if ((ecdh = EC_KEY_new()) == NULL) {
1797 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1798 goto err;
1799 }
1800
1801 /*
1802 * Extract elliptic curve parameters and the server's ephemeral ECDH
1803 * public key. Keep accumulating lengths of various components in
1804 * param_len and make sure it never exceeds n.
1805 */
1806
1807 /*
1808 * XXX: For now we only support named (not generic) curves and the
1809 * ECParameters in this case is just three bytes. We also need one
1810 * byte for the length of the encoded point
1811 */
1812 param_len = 4;
1813 if (param_len > n) {
1814 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1815 goto f_err;
1816 }
1817 /*
1818 * Check curve is one of our preferences, if not server has sent an
1819 * invalid curve. ECParameters is 3 bytes.
1820 */
1821 if (!tls1_check_curve(s, p, 3)) {
1822 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_CURVE);
1823 goto f_err;
1824 }
1825
1826 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) {
1827 al = SSL_AD_INTERNAL_ERROR;
1828 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1829 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1830 goto f_err;
1831 }
1832
1833 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1834 if (ngroup == NULL) {
1835 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1836 goto err;
1837 }
1838 if (EC_KEY_set_group(ecdh, ngroup) == 0) {
1839 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1840 goto err;
1841 }
1842 EC_GROUP_free(ngroup);
1843
1844 group = EC_KEY_get0_group(ecdh);
1845
1846 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1847 (EC_GROUP_get_degree(group) > 163)) {
1848 al = SSL_AD_EXPORT_RESTRICTION;
1849 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1850 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1851 goto f_err;
1852 }
1853
1854 p += 3;
1855
1856 /* Next, get the encoded ECPoint */
1857 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1858 ((bn_ctx = BN_CTX_new()) == NULL)) {
1859 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1860 goto err;
1861 }
1862
1863 encoded_pt_len = *p; /* length of encoded point */
1864 p += 1;
1865
1866 if ((encoded_pt_len > n - param_len) ||
1867 (EC_POINT_oct2point(group, srvr_ecpoint,
1868 p, encoded_pt_len, bn_ctx) == 0)) {
1869 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
1870 goto f_err;
1871 }
1872 param_len += encoded_pt_len;
1873
1874 n -= param_len;
1875 p += encoded_pt_len;
1876
1877 /*
1878 * The ECC/TLS specification does not mention the use of DSA to sign
1879 * ECParameters in the server key exchange message. We do support RSA
1880 * and ECDSA.
1881 */
1882 if (0) ;
1883 # ifndef OPENSSL_NO_RSA
1884 else if (alg_a & SSL_aRSA)
1885 pkey =
1886 X509_get_pubkey(s->session->
1887 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1888 # endif
1889 # ifndef OPENSSL_NO_ECDSA
1890 else if (alg_a & SSL_aECDSA)
1891 pkey =
1892 X509_get_pubkey(s->session->
1893 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1894 # endif
1895 /* else anonymous ECDH, so no certificate or pkey. */
1896 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1897 s->session->sess_cert->peer_ecdh_tmp = ecdh;
1898 ecdh = NULL;
1899 BN_CTX_free(bn_ctx);
1900 bn_ctx = NULL;
1901 EC_POINT_free(srvr_ecpoint);
1902 srvr_ecpoint = NULL;
1903 } else if (alg_k) {
1904 al = SSL_AD_UNEXPECTED_MESSAGE;
1905 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1906 goto f_err;
1907 }
1908 #endif /* !OPENSSL_NO_ECDH */
1909
1910 /* p points to the next byte, there are 'n' bytes left */
1911
1912 /* if it was signed, check the signature */
1913 if (pkey != NULL) {
1914 if (SSL_USE_SIGALGS(s)) {
1915 int rv;
1916 if (2 > n) {
1917 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1918 goto f_err;
1919 }
1920 rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1921 if (rv == -1)
1922 goto err;
1923 else if (rv == 0) {
1924 goto f_err;
1925 }
1926 #ifdef SSL_DEBUG
1927 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1928 #endif
1929 p += 2;
1930 n -= 2;
1931 } else
1932 md = EVP_sha1();
1933
1934 if (2 > n) {
1935 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1936 goto f_err;
1937 }
1938 n2s(p, i);
1939 n -= 2;
1940 j = EVP_PKEY_size(pkey);
1941
1942 /*
1943 * Check signature length. If n is 0 then signature is empty
1944 */
1945 if ((i != n) || (n > j) || (n <= 0)) {
1946 /* wrong packet length */
1947 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH);
1948 goto f_err;
1949 }
1950 #ifndef OPENSSL_NO_RSA
1951 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) {
1952 int num;
1953 unsigned int size;
1954
1955 j = 0;
1956 q = md_buf;
1957 for (num = 2; num > 0; num--) {
1958 EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1959 if (EVP_DigestInit_ex(&md_ctx,
1960 (num == 2) ? s->ctx->md5 : s->ctx->sha1,
1961 NULL) <= 0
1962 || EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1963 SSL3_RANDOM_SIZE) <= 0
1964 || EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1965 SSL3_RANDOM_SIZE) <= 0
1966 || EVP_DigestUpdate(&md_ctx, param, param_len) <= 0
1967 || EVP_DigestFinal_ex(&md_ctx, q, &size) <= 0) {
1968 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1969 ERR_R_INTERNAL_ERROR);
1970 al = SSL_AD_INTERNAL_ERROR;
1971 goto f_err;
1972 }
1973 q += size;
1974 j += size;
1975 }
1976 i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa);
1977 if (i < 0) {
1978 al = SSL_AD_DECRYPT_ERROR;
1979 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT);
1980 goto f_err;
1981 }
1982 if (i == 0) {
1983 /* bad signature */
1984 al = SSL_AD_DECRYPT_ERROR;
1985 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1986 goto f_err;
1987 }
1988 } else
1989 #endif
1990 {
1991 if (EVP_VerifyInit_ex(&md_ctx, md, NULL) <= 0
1992 || EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
1993 SSL3_RANDOM_SIZE) <= 0
1994 || EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
1995 SSL3_RANDOM_SIZE) <= 0
1996 || EVP_VerifyUpdate(&md_ctx, param, param_len) <= 0) {
1997 al = SSL_AD_INTERNAL_ERROR;
1998 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EVP_LIB);
1999 goto f_err;
2000 }
2001 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
2002 /* bad signature */
2003 al = SSL_AD_DECRYPT_ERROR;
2004 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
2005 goto f_err;
2006 }
2007 }
2008 } else {
2009 /* aNULL, aSRP or kPSK do not need public keys */
2010 if (!(alg_a & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_kPSK)) {
2011 /* Might be wrong key type, check it */
2012 if (ssl3_check_cert_and_algorithm(s))
2013 /* Otherwise this shouldn't happen */
2014 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2015 goto err;
2016 }
2017 /* still data left over */
2018 if (n != 0) {
2019 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
2020 goto f_err;
2021 }
2022 }
2023 EVP_PKEY_free(pkey);
2024 EVP_MD_CTX_cleanup(&md_ctx);
2025 return (1);
2026 f_err:
2027 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2028 err:
2029 EVP_PKEY_free(pkey);
2030 #ifndef OPENSSL_NO_RSA
2031 if (rsa != NULL)
2032 RSA_free(rsa);
2033 #endif
2034 #ifndef OPENSSL_NO_DH
2035 if (dh != NULL)
2036 DH_free(dh);
2037 #endif
2038 #ifndef OPENSSL_NO_ECDH
2039 BN_CTX_free(bn_ctx);
2040 EC_POINT_free(srvr_ecpoint);
2041 if (ecdh != NULL)
2042 EC_KEY_free(ecdh);
2043 #endif
2044 EVP_MD_CTX_cleanup(&md_ctx);
2045 s->state = SSL_ST_ERR;
2046 return (-1);
2047 }
2048
ssl3_get_certificate_request(SSL * s)2049 int ssl3_get_certificate_request(SSL *s)
2050 {
2051 int ok, ret = 0;
2052 unsigned long n, nc, l;
2053 unsigned int llen, ctype_num, i;
2054 X509_NAME *xn = NULL;
2055 const unsigned char *p, *q;
2056 unsigned char *d;
2057 STACK_OF(X509_NAME) *ca_sk = NULL;
2058
2059 n = s->method->ssl_get_message(s,
2060 SSL3_ST_CR_CERT_REQ_A,
2061 SSL3_ST_CR_CERT_REQ_B,
2062 -1, s->max_cert_list, &ok);
2063
2064 if (!ok)
2065 return ((int)n);
2066
2067 s->s3->tmp.cert_req = 0;
2068
2069 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) {
2070 s->s3->tmp.reuse_message = 1;
2071 /*
2072 * If we get here we don't need any cached handshake records as we
2073 * wont be doing client auth.
2074 */
2075 if (s->s3->handshake_buffer) {
2076 if (!ssl3_digest_cached_records(s))
2077 goto err;
2078 }
2079 return (1);
2080 }
2081
2082 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
2083 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2084 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE);
2085 goto err;
2086 }
2087
2088 /* TLS does not like anon-DH with client cert */
2089 if (s->version > SSL3_VERSION) {
2090 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) {
2091 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2092 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2093 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2094 goto err;
2095 }
2096 }
2097
2098 p = d = (unsigned char *)s->init_msg;
2099
2100 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
2101 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2102 goto err;
2103 }
2104
2105 /* get the certificate types */
2106 ctype_num = *(p++);
2107 if (s->cert->ctypes) {
2108 OPENSSL_free(s->cert->ctypes);
2109 s->cert->ctypes = NULL;
2110 }
2111 if (ctype_num > SSL3_CT_NUMBER) {
2112 /* If we exceed static buffer copy all to cert structure */
2113 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2114 memcpy(s->cert->ctypes, p, ctype_num);
2115 s->cert->ctype_num = (size_t)ctype_num;
2116 ctype_num = SSL3_CT_NUMBER;
2117 }
2118 for (i = 0; i < ctype_num; i++)
2119 s->s3->tmp.ctype[i] = p[i];
2120 p += p[-1];
2121 if (SSL_USE_SIGALGS(s)) {
2122 n2s(p, llen);
2123 /*
2124 * Check we have enough room for signature algorithms and following
2125 * length value.
2126 */
2127 if ((unsigned long)(p - d + llen + 2) > n) {
2128 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2129 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2130 SSL_R_DATA_LENGTH_TOO_LONG);
2131 goto err;
2132 }
2133 /* Clear certificate digests and validity flags */
2134 for (i = 0; i < SSL_PKEY_NUM; i++) {
2135 s->cert->pkeys[i].digest = NULL;
2136 s->cert->pkeys[i].valid_flags = 0;
2137 }
2138 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen)) {
2139 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2140 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2141 SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2142 goto err;
2143 }
2144 if (!tls1_process_sigalgs(s)) {
2145 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2146 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2147 goto err;
2148 }
2149 p += llen;
2150 }
2151
2152 /* get the CA RDNs */
2153 n2s(p, llen);
2154 #if 0
2155 {
2156 FILE *out;
2157 out = fopen("/tmp/vsign.der", "w");
2158 fwrite(p, 1, llen, out);
2159 fclose(out);
2160 }
2161 #endif
2162
2163 if ((unsigned long)(p - d + llen) != n) {
2164 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2165 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
2166 goto err;
2167 }
2168
2169 for (nc = 0; nc < llen;) {
2170 n2s(p, l);
2171 if ((l + nc + 2) > llen) {
2172 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2173 goto cont; /* netscape bugs */
2174 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2175 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
2176 goto err;
2177 }
2178
2179 q = p;
2180
2181 if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) {
2182 /* If netscape tolerance is on, ignore errors */
2183 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2184 goto cont;
2185 else {
2186 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2187 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
2188 goto err;
2189 }
2190 }
2191
2192 if (q != (p + l)) {
2193 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2194 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
2195 SSL_R_CA_DN_LENGTH_MISMATCH);
2196 goto err;
2197 }
2198 if (!sk_X509_NAME_push(ca_sk, xn)) {
2199 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2200 goto err;
2201 }
2202
2203 p += l;
2204 nc += l + 2;
2205 }
2206
2207 if (0) {
2208 cont:
2209 ERR_clear_error();
2210 }
2211
2212 /* we should setup a certificate to return.... */
2213 s->s3->tmp.cert_req = 1;
2214 s->s3->tmp.ctype_num = ctype_num;
2215 if (s->s3->tmp.ca_names != NULL)
2216 sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
2217 s->s3->tmp.ca_names = ca_sk;
2218 ca_sk = NULL;
2219
2220 ret = 1;
2221 goto done;
2222 err:
2223 s->state = SSL_ST_ERR;
2224 done:
2225 if (ca_sk != NULL)
2226 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
2227 return (ret);
2228 }
2229
ca_dn_cmp(const X509_NAME * const * a,const X509_NAME * const * b)2230 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
2231 {
2232 return (X509_NAME_cmp(*a, *b));
2233 }
2234
2235 #ifndef OPENSSL_NO_TLSEXT
ssl3_get_new_session_ticket(SSL * s)2236 int ssl3_get_new_session_ticket(SSL *s)
2237 {
2238 int ok, al, ret = 0, ticklen;
2239 long n;
2240 const unsigned char *p;
2241 unsigned char *d;
2242 unsigned long ticket_lifetime_hint;
2243
2244 n = s->method->ssl_get_message(s,
2245 SSL3_ST_CR_SESSION_TICKET_A,
2246 SSL3_ST_CR_SESSION_TICKET_B,
2247 SSL3_MT_NEWSESSION_TICKET, 16384, &ok);
2248
2249 if (!ok)
2250 return ((int)n);
2251
2252 if (n < 6) {
2253 /* need at least ticket_lifetime_hint + ticket length */
2254 al = SSL_AD_DECODE_ERROR;
2255 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2256 goto f_err;
2257 }
2258
2259 p = d = (unsigned char *)s->init_msg;
2260
2261 n2l(p, ticket_lifetime_hint);
2262 n2s(p, ticklen);
2263 /* ticket_lifetime_hint + ticket_length + ticket */
2264 if (ticklen + 6 != n) {
2265 al = SSL_AD_DECODE_ERROR;
2266 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
2267 goto f_err;
2268 }
2269
2270 /* Server is allowed to change its mind and send an empty ticket. */
2271 if (ticklen == 0)
2272 return 1;
2273
2274 if (s->session->session_id_length > 0) {
2275 int i = s->session_ctx->session_cache_mode;
2276 SSL_SESSION *new_sess;
2277 /*
2278 * We reused an existing session, so we need to replace it with a new
2279 * one
2280 */
2281 if (i & SSL_SESS_CACHE_CLIENT) {
2282 /*
2283 * Remove the old session from the cache
2284 */
2285 if (i & SSL_SESS_CACHE_NO_INTERNAL_STORE) {
2286 if (s->session_ctx->remove_session_cb != NULL)
2287 s->session_ctx->remove_session_cb(s->session_ctx,
2288 s->session);
2289 } else {
2290 /* We carry on if this fails */
2291 SSL_CTX_remove_session(s->session_ctx, s->session);
2292 }
2293 }
2294
2295 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) {
2296 al = SSL_AD_INTERNAL_ERROR;
2297 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
2298 goto f_err;
2299 }
2300
2301 SSL_SESSION_free(s->session);
2302 s->session = new_sess;
2303 }
2304
2305 if (s->session->tlsext_tick) {
2306 OPENSSL_free(s->session->tlsext_tick);
2307 s->session->tlsext_ticklen = 0;
2308 }
2309 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2310 if (!s->session->tlsext_tick) {
2311 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
2312 goto err;
2313 }
2314 memcpy(s->session->tlsext_tick, p, ticklen);
2315 s->session->tlsext_tick_lifetime_hint = ticket_lifetime_hint;
2316 s->session->tlsext_ticklen = ticklen;
2317 /*
2318 * There are two ways to detect a resumed ticket session. One is to set
2319 * an appropriate session ID and then the server must return a match in
2320 * ServerHello. This allows the normal client session ID matching to work
2321 * and we know much earlier that the ticket has been accepted. The
2322 * other way is to set zero length session ID when the ticket is
2323 * presented and rely on the handshake to determine session resumption.
2324 * We choose the former approach because this fits in with assumptions
2325 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is
2326 * SHA256 is disabled) hash of the ticket.
2327 */
2328 EVP_Digest(p, ticklen,
2329 s->session->session_id, &s->session->session_id_length,
2330 # ifndef OPENSSL_NO_SHA256
2331 EVP_sha256(), NULL);
2332 # else
2333 EVP_sha1(), NULL);
2334 # endif
2335 ret = 1;
2336 return (ret);
2337 f_err:
2338 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2339 err:
2340 s->state = SSL_ST_ERR;
2341 return (-1);
2342 }
2343
ssl3_get_cert_status(SSL * s)2344 int ssl3_get_cert_status(SSL *s)
2345 {
2346 int ok, al;
2347 unsigned long resplen, n;
2348 const unsigned char *p;
2349
2350 n = s->method->ssl_get_message(s,
2351 SSL3_ST_CR_CERT_STATUS_A,
2352 SSL3_ST_CR_CERT_STATUS_B,
2353 SSL3_MT_CERTIFICATE_STATUS, 16384, &ok);
2354
2355 if (!ok)
2356 return ((int)n);
2357 if (n < 4) {
2358 /* need at least status type + length */
2359 al = SSL_AD_DECODE_ERROR;
2360 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2361 goto f_err;
2362 }
2363 p = (unsigned char *)s->init_msg;
2364 if (*p++ != TLSEXT_STATUSTYPE_ocsp) {
2365 al = SSL_AD_DECODE_ERROR;
2366 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE);
2367 goto f_err;
2368 }
2369 n2l3(p, resplen);
2370 if (resplen + 4 != n) {
2371 al = SSL_AD_DECODE_ERROR;
2372 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
2373 goto f_err;
2374 }
2375 if (s->tlsext_ocsp_resp)
2376 OPENSSL_free(s->tlsext_ocsp_resp);
2377 s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2378 if (!s->tlsext_ocsp_resp) {
2379 al = SSL_AD_INTERNAL_ERROR;
2380 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2381 goto f_err;
2382 }
2383 s->tlsext_ocsp_resplen = resplen;
2384 if (s->ctx->tlsext_status_cb) {
2385 int ret;
2386 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2387 if (ret == 0) {
2388 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2389 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE);
2390 goto f_err;
2391 }
2392 if (ret < 0) {
2393 al = SSL_AD_INTERNAL_ERROR;
2394 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
2395 goto f_err;
2396 }
2397 }
2398 return 1;
2399 f_err:
2400 ssl3_send_alert(s, SSL3_AL_FATAL, al);
2401 s->state = SSL_ST_ERR;
2402 return (-1);
2403 }
2404 #endif
2405
ssl3_get_server_done(SSL * s)2406 int ssl3_get_server_done(SSL *s)
2407 {
2408 int ok, ret = 0;
2409 long n;
2410
2411 /* Second to last param should be very small, like 0 :-) */
2412 n = s->method->ssl_get_message(s,
2413 SSL3_ST_CR_SRVR_DONE_A,
2414 SSL3_ST_CR_SRVR_DONE_B,
2415 SSL3_MT_SERVER_DONE, 30, &ok);
2416
2417 if (!ok)
2418 return ((int)n);
2419 if (n > 0) {
2420 /* should contain no data */
2421 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
2422 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
2423 s->state = SSL_ST_ERR;
2424 return -1;
2425 }
2426 ret = 1;
2427 return (ret);
2428 }
2429
2430 #ifndef OPENSSL_NO_DH
get_server_static_dh_key(SESS_CERT * scert)2431 static DH *get_server_static_dh_key(SESS_CERT *scert)
2432 {
2433 DH *dh_srvr = NULL;
2434 EVP_PKEY *spkey = NULL;
2435 int idx = scert->peer_cert_type;
2436
2437 if (idx >= 0)
2438 spkey = X509_get_pubkey(scert->peer_pkeys[idx].x509);
2439 if (spkey) {
2440 dh_srvr = EVP_PKEY_get1_DH(spkey);
2441 EVP_PKEY_free(spkey);
2442 }
2443 if (dh_srvr == NULL)
2444 SSLerr(SSL_F_GET_SERVER_STATIC_DH_KEY, ERR_R_INTERNAL_ERROR);
2445 return dh_srvr;
2446 }
2447 #endif
2448
ssl3_send_client_key_exchange(SSL * s)2449 int ssl3_send_client_key_exchange(SSL *s)
2450 {
2451 unsigned char *p;
2452 int n;
2453 unsigned long alg_k;
2454 #ifndef OPENSSL_NO_RSA
2455 unsigned char *q;
2456 EVP_PKEY *pkey = NULL;
2457 #endif
2458 #ifndef OPENSSL_NO_KRB5
2459 KSSL_ERR kssl_err;
2460 #endif /* OPENSSL_NO_KRB5 */
2461 #ifndef OPENSSL_NO_ECDH
2462 EC_KEY *clnt_ecdh = NULL;
2463 const EC_POINT *srvr_ecpoint = NULL;
2464 EVP_PKEY *srvr_pub_pkey = NULL;
2465 unsigned char *encodedPoint = NULL;
2466 int encoded_pt_len = 0;
2467 BN_CTX *bn_ctx = NULL;
2468 #endif
2469
2470 if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
2471 p = ssl_handshake_start(s);
2472
2473 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
2474
2475 /* Fool emacs indentation */
2476 if (0) {
2477 }
2478 #ifndef OPENSSL_NO_RSA
2479 else if (alg_k & SSL_kRSA) {
2480 RSA *rsa;
2481 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2482
2483 if (s->session->sess_cert == NULL) {
2484 /*
2485 * We should always have a server certificate with SSL_kRSA.
2486 */
2487 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2488 ERR_R_INTERNAL_ERROR);
2489 goto err;
2490 }
2491
2492 if (s->session->sess_cert->peer_rsa_tmp != NULL)
2493 rsa = s->session->sess_cert->peer_rsa_tmp;
2494 else {
2495 pkey =
2496 X509_get_pubkey(s->session->
2497 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
2498 x509);
2499 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
2500 || (pkey->pkey.rsa == NULL)) {
2501 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2502 ERR_R_INTERNAL_ERROR);
2503 EVP_PKEY_free(pkey);
2504 goto err;
2505 }
2506 rsa = pkey->pkey.rsa;
2507 EVP_PKEY_free(pkey);
2508 }
2509
2510 tmp_buf[0] = s->client_version >> 8;
2511 tmp_buf[1] = s->client_version & 0xff;
2512 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
2513 goto err;
2514
2515 s->session->master_key_length = sizeof tmp_buf;
2516
2517 q = p;
2518 /* Fix buf for TLS and beyond */
2519 if (s->version > SSL3_VERSION)
2520 p += 2;
2521 n = RSA_public_encrypt(sizeof tmp_buf,
2522 tmp_buf, p, rsa, RSA_PKCS1_PADDING);
2523 # ifdef PKCS1_CHECK
2524 if (s->options & SSL_OP_PKCS1_CHECK_1)
2525 p[1]++;
2526 if (s->options & SSL_OP_PKCS1_CHECK_2)
2527 tmp_buf[0] = 0x70;
2528 # endif
2529 if (n <= 0) {
2530 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2531 SSL_R_BAD_RSA_ENCRYPT);
2532 goto err;
2533 }
2534
2535 /* Fix buf for TLS and beyond */
2536 if (s->version > SSL3_VERSION) {
2537 s2n(n, q);
2538 n += 2;
2539 }
2540
2541 s->session->master_key_length =
2542 s->method->ssl3_enc->generate_master_secret(s,
2543 s->
2544 session->master_key,
2545 tmp_buf,
2546 sizeof tmp_buf);
2547 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2548 }
2549 #endif
2550 #ifndef OPENSSL_NO_KRB5
2551 else if (alg_k & SSL_kKRB5) {
2552 krb5_error_code krb5rc;
2553 KSSL_CTX *kssl_ctx = s->kssl_ctx;
2554 /* krb5_data krb5_ap_req; */
2555 krb5_data *enc_ticket;
2556 krb5_data authenticator, *authp = NULL;
2557 EVP_CIPHER_CTX ciph_ctx;
2558 const EVP_CIPHER *enc = NULL;
2559 unsigned char iv[EVP_MAX_IV_LENGTH];
2560 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2561 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH];
2562 int padl, outl = sizeof(epms);
2563
2564 EVP_CIPHER_CTX_init(&ciph_ctx);
2565
2566 # ifdef KSSL_DEBUG
2567 fprintf(stderr, "ssl3_send_client_key_exchange(%lx & %lx)\n",
2568 alg_k, SSL_kKRB5);
2569 # endif /* KSSL_DEBUG */
2570
2571 authp = NULL;
2572 # ifdef KRB5SENDAUTH
2573 if (KRB5SENDAUTH)
2574 authp = &authenticator;
2575 # endif /* KRB5SENDAUTH */
2576
2577 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err);
2578 enc = kssl_map_enc(kssl_ctx->enctype);
2579 if (enc == NULL)
2580 goto err;
2581 # ifdef KSSL_DEBUG
2582 {
2583 fprintf(stderr, "kssl_cget_tkt rtn %d\n", krb5rc);
2584 if (krb5rc && kssl_err.text)
2585 fprintf(stderr, "kssl_cget_tkt kssl_err=%s\n",
2586 kssl_err.text);
2587 }
2588 # endif /* KSSL_DEBUG */
2589
2590 if (krb5rc) {
2591 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2592 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
2593 goto err;
2594 }
2595
2596 /*-
2597 * 20010406 VRS - Earlier versions used KRB5 AP_REQ
2598 * in place of RFC 2712 KerberosWrapper, as in:
2599 *
2600 * Send ticket (copy to *p, set n = length)
2601 * n = krb5_ap_req.length;
2602 * memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2603 * if (krb5_ap_req.data)
2604 * kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2605 *
2606 * Now using real RFC 2712 KerberosWrapper
2607 * (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2608 * Note: 2712 "opaque" types are here replaced
2609 * with a 2-byte length followed by the value.
2610 * Example:
2611 * KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2612 * Where "xx xx" = length bytes. Shown here with
2613 * optional authenticator omitted.
2614 */
2615
2616 /* KerberosWrapper.Ticket */
2617 s2n(enc_ticket->length, p);
2618 memcpy(p, enc_ticket->data, enc_ticket->length);
2619 p += enc_ticket->length;
2620 n = enc_ticket->length + 2;
2621
2622 /* KerberosWrapper.Authenticator */
2623 if (authp && authp->length) {
2624 s2n(authp->length, p);
2625 memcpy(p, authp->data, authp->length);
2626 p += authp->length;
2627 n += authp->length + 2;
2628
2629 free(authp->data);
2630 authp->data = NULL;
2631 authp->length = 0;
2632 } else {
2633 s2n(0, p); /* null authenticator length */
2634 n += 2;
2635 }
2636
2637 tmp_buf[0] = s->client_version >> 8;
2638 tmp_buf[1] = s->client_version & 0xff;
2639 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
2640 goto err;
2641
2642 /*-
2643 * 20010420 VRS. Tried it this way; failed.
2644 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2645 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2646 * kssl_ctx->length);
2647 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2648 */
2649
2650 memset(iv, 0, sizeof iv); /* per RFC 1510 */
2651 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
2652 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf,
2653 sizeof tmp_buf);
2654 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
2655 outl += padl;
2656 if (outl > (int)sizeof epms) {
2657 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2658 ERR_R_INTERNAL_ERROR);
2659 goto err;
2660 }
2661 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2662
2663 /* KerberosWrapper.EncryptedPreMasterSecret */
2664 s2n(outl, p);
2665 memcpy(p, epms, outl);
2666 p += outl;
2667 n += outl + 2;
2668
2669 s->session->master_key_length =
2670 s->method->ssl3_enc->generate_master_secret(s,
2671 s->
2672 session->master_key,
2673 tmp_buf,
2674 sizeof tmp_buf);
2675
2676 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2677 OPENSSL_cleanse(epms, outl);
2678 }
2679 #endif
2680 #ifndef OPENSSL_NO_DH
2681 else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
2682 DH *dh_srvr, *dh_clnt;
2683 SESS_CERT *scert = s->session->sess_cert;
2684
2685 if (scert == NULL) {
2686 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2687 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2688 SSL_R_UNEXPECTED_MESSAGE);
2689 goto err;
2690 }
2691
2692 if (scert->peer_dh_tmp != NULL) {
2693 dh_srvr = scert->peer_dh_tmp;
2694 } else {
2695 dh_srvr = get_server_static_dh_key(scert);
2696 if (dh_srvr == NULL)
2697 goto err;
2698 }
2699
2700 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
2701 /* Use client certificate key */
2702 EVP_PKEY *clkey = s->cert->key->privatekey;
2703 dh_clnt = NULL;
2704 if (clkey)
2705 dh_clnt = EVP_PKEY_get1_DH(clkey);
2706 if (dh_clnt == NULL) {
2707 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2708 ERR_R_INTERNAL_ERROR);
2709 goto err;
2710 }
2711 } else {
2712 /* generate a new random key */
2713 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
2714 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2715 goto err;
2716 }
2717 if (!DH_generate_key(dh_clnt)) {
2718 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2719 DH_free(dh_clnt);
2720 goto err;
2721 }
2722 }
2723
2724 /*
2725 * use the 'p' output buffer for the DH key, but make sure to
2726 * clear it out afterwards
2727 */
2728
2729 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt);
2730 if (scert->peer_dh_tmp == NULL)
2731 DH_free(dh_srvr);
2732
2733 if (n <= 0) {
2734 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2735 DH_free(dh_clnt);
2736 goto err;
2737 }
2738
2739 /* generate master key from the result */
2740 s->session->master_key_length =
2741 s->method->ssl3_enc->generate_master_secret(s,
2742 s->
2743 session->master_key,
2744 p, n);
2745 /* clean up */
2746 memset(p, 0, n);
2747
2748 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2749 n = 0;
2750 else {
2751 /* send off the data */
2752 n = BN_num_bytes(dh_clnt->pub_key);
2753 s2n(n, p);
2754 BN_bn2bin(dh_clnt->pub_key, p);
2755 n += 2;
2756 }
2757
2758 DH_free(dh_clnt);
2759 }
2760 #endif
2761
2762 #ifndef OPENSSL_NO_ECDH
2763 else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) {
2764 const EC_GROUP *srvr_group = NULL;
2765 EC_KEY *tkey;
2766 int ecdh_clnt_cert = 0;
2767 int field_size = 0;
2768
2769 if (s->session->sess_cert == NULL) {
2770 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2771 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2772 SSL_R_UNEXPECTED_MESSAGE);
2773 goto err;
2774 }
2775
2776 /*
2777 * Did we send out the client's ECDH share for use in premaster
2778 * computation as part of client certificate? If so, set
2779 * ecdh_clnt_cert to 1.
2780 */
2781 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) {
2782 /*-
2783 * XXX: For now, we do not support client
2784 * authentication using ECDH certificates.
2785 * To add such support, one needs to add
2786 * code that checks for appropriate
2787 * conditions and sets ecdh_clnt_cert to 1.
2788 * For example, the cert have an ECC
2789 * key on the same curve as the server's
2790 * and the key should be authorized for
2791 * key agreement.
2792 *
2793 * One also needs to add code in ssl3_connect
2794 * to skip sending the certificate verify
2795 * message.
2796 *
2797 * if ((s->cert->key->privatekey != NULL) &&
2798 * (s->cert->key->privatekey->type ==
2799 * EVP_PKEY_EC) && ...)
2800 * ecdh_clnt_cert = 1;
2801 */
2802 }
2803
2804 if (s->session->sess_cert->peer_ecdh_tmp != NULL) {
2805 tkey = s->session->sess_cert->peer_ecdh_tmp;
2806 } else {
2807 /* Get the Server Public Key from Cert */
2808 srvr_pub_pkey =
2809 X509_get_pubkey(s->session->
2810 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2811 if ((srvr_pub_pkey == NULL)
2812 || (srvr_pub_pkey->type != EVP_PKEY_EC)
2813 || (srvr_pub_pkey->pkey.ec == NULL)) {
2814 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2815 ERR_R_INTERNAL_ERROR);
2816 goto err;
2817 }
2818
2819 tkey = srvr_pub_pkey->pkey.ec;
2820 }
2821
2822 srvr_group = EC_KEY_get0_group(tkey);
2823 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2824
2825 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) {
2826 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2827 ERR_R_INTERNAL_ERROR);
2828 goto err;
2829 }
2830
2831 if ((clnt_ecdh = EC_KEY_new()) == NULL) {
2832 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2833 ERR_R_MALLOC_FAILURE);
2834 goto err;
2835 }
2836
2837 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) {
2838 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2839 goto err;
2840 }
2841 if (ecdh_clnt_cert) {
2842 /*
2843 * Reuse key info from our certificate We only need our
2844 * private key to perform the ECDH computation.
2845 */
2846 const BIGNUM *priv_key;
2847 tkey = s->cert->key->privatekey->pkey.ec;
2848 priv_key = EC_KEY_get0_private_key(tkey);
2849 if (priv_key == NULL) {
2850 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2851 ERR_R_MALLOC_FAILURE);
2852 goto err;
2853 }
2854 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) {
2855 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2856 goto err;
2857 }
2858 } else {
2859 /* Generate a new ECDH key pair */
2860 if (!(EC_KEY_generate_key(clnt_ecdh))) {
2861 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2862 ERR_R_ECDH_LIB);
2863 goto err;
2864 }
2865 }
2866
2867 /*
2868 * use the 'p' output buffer for the ECDH key, but make sure to
2869 * clear it out afterwards
2870 */
2871
2872 field_size = EC_GROUP_get_degree(srvr_group);
2873 if (field_size <= 0) {
2874 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2875 goto err;
2876 }
2877 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint,
2878 clnt_ecdh, NULL);
2879 if (n <= 0) {
2880 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2881 goto err;
2882 }
2883
2884 /* generate master key from the result */
2885 s->session->master_key_length =
2886 s->method->ssl3_enc->generate_master_secret(s,
2887 s->
2888 session->master_key,
2889 p, n);
2890
2891 memset(p, 0, n); /* clean up */
2892
2893 if (ecdh_clnt_cert) {
2894 /* Send empty client key exch message */
2895 n = 0;
2896 } else {
2897 /*
2898 * First check the size of encoding and allocate memory
2899 * accordingly.
2900 */
2901 encoded_pt_len =
2902 EC_POINT_point2oct(srvr_group,
2903 EC_KEY_get0_public_key(clnt_ecdh),
2904 POINT_CONVERSION_UNCOMPRESSED,
2905 NULL, 0, NULL);
2906
2907 encodedPoint = (unsigned char *)
2908 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char));
2909 bn_ctx = BN_CTX_new();
2910 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
2911 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2912 ERR_R_MALLOC_FAILURE);
2913 goto err;
2914 }
2915
2916 /* Encode the public key */
2917 n = EC_POINT_point2oct(srvr_group,
2918 EC_KEY_get0_public_key(clnt_ecdh),
2919 POINT_CONVERSION_UNCOMPRESSED,
2920 encodedPoint, encoded_pt_len, bn_ctx);
2921
2922 *p = n; /* length of encoded point */
2923 /* Encoded point will be copied here */
2924 p += 1;
2925 /* copy the point */
2926 memcpy((unsigned char *)p, encodedPoint, n);
2927 /* increment n to account for length field */
2928 n += 1;
2929 }
2930
2931 /* Free allocated memory */
2932 BN_CTX_free(bn_ctx);
2933 if (encodedPoint != NULL)
2934 OPENSSL_free(encodedPoint);
2935 if (clnt_ecdh != NULL)
2936 EC_KEY_free(clnt_ecdh);
2937 EVP_PKEY_free(srvr_pub_pkey);
2938 }
2939 #endif /* !OPENSSL_NO_ECDH */
2940 else if (alg_k & SSL_kGOST) {
2941 /* GOST key exchange message creation */
2942 EVP_PKEY_CTX *pkey_ctx;
2943 X509 *peer_cert;
2944 size_t msglen;
2945 unsigned int md_len;
2946 int keytype;
2947 unsigned char premaster_secret[32], shared_ukm[32], tmp[256];
2948 EVP_MD_CTX *ukm_hash;
2949 EVP_PKEY *pub_key;
2950
2951 /*
2952 * Get server sertificate PKEY and create ctx from it
2953 */
2954 peer_cert =
2955 s->session->
2956 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST01)].x509;
2957 if (!peer_cert)
2958 peer_cert =
2959 s->session->
2960 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST94)].x509;
2961 if (!peer_cert) {
2962 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2963 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2964 goto err;
2965 }
2966
2967 pkey_ctx = EVP_PKEY_CTX_new(pub_key =
2968 X509_get_pubkey(peer_cert), NULL);
2969 if (pkey_ctx == NULL) {
2970 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2971 ERR_R_MALLOC_FAILURE);
2972 goto err;
2973 }
2974 /*
2975 * If we have send a certificate, and certificate key
2976 *
2977 * * parameters match those of server certificate, use
2978 * certificate key for key exchange
2979 */
2980
2981 /* Otherwise, generate ephemeral key pair */
2982
2983 if (pkey_ctx == NULL
2984 || EVP_PKEY_encrypt_init(pkey_ctx) <= 0
2985 /* Generate session key */
2986 || RAND_bytes(premaster_secret, 32) <= 0) {
2987 EVP_PKEY_CTX_free(pkey_ctx);
2988 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2989 ERR_R_INTERNAL_ERROR);
2990 goto err;
2991 }
2992 /*
2993 * If we have client certificate, use its secret as peer key
2994 */
2995 if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2996 if (EVP_PKEY_derive_set_peer
2997 (pkey_ctx, s->cert->key->privatekey) <= 0) {
2998 /*
2999 * If there was an error - just ignore it. Ephemeral key
3000 * * would be used
3001 */
3002 ERR_clear_error();
3003 }
3004 }
3005 /*
3006 * Compute shared IV and store it in algorithm-specific context
3007 * data
3008 */
3009 ukm_hash = EVP_MD_CTX_create();
3010 if (EVP_DigestInit(ukm_hash,
3011 EVP_get_digestbynid(NID_id_GostR3411_94)) <= 0
3012 || EVP_DigestUpdate(ukm_hash, s->s3->client_random,
3013 SSL3_RANDOM_SIZE) <= 0
3014 || EVP_DigestUpdate(ukm_hash, s->s3->server_random,
3015 SSL3_RANDOM_SIZE) <= 0
3016 || EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len) <= 0) {
3017 EVP_MD_CTX_destroy(ukm_hash);
3018 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3019 ERR_R_INTERNAL_ERROR);
3020 goto err;
3021 }
3022 EVP_MD_CTX_destroy(ukm_hash);
3023 if (EVP_PKEY_CTX_ctrl
3024 (pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, EVP_PKEY_CTRL_SET_IV, 8,
3025 shared_ukm) < 0) {
3026 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3027 SSL_R_LIBRARY_BUG);
3028 goto err;
3029 }
3030 /* Make GOST keytransport blob message */
3031 /*
3032 * Encapsulate it into sequence
3033 */
3034 *(p++) = V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
3035 msglen = 255;
3036 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 32)
3037 <= 0) {
3038 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3039 SSL_R_LIBRARY_BUG);
3040 goto err;
3041 }
3042 if (msglen >= 0x80) {
3043 *(p++) = 0x81;
3044 *(p++) = msglen & 0xff;
3045 n = msglen + 3;
3046 } else {
3047 *(p++) = msglen & 0xff;
3048 n = msglen + 2;
3049 }
3050 memcpy(p, tmp, msglen);
3051 /* Check if pubkey from client certificate was used */
3052 if (EVP_PKEY_CTX_ctrl
3053 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) {
3054 /* Set flag "skip certificate verify" */
3055 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3056 }
3057 EVP_PKEY_CTX_free(pkey_ctx);
3058 s->session->master_key_length =
3059 s->method->ssl3_enc->generate_master_secret(s,
3060 s->
3061 session->master_key,
3062 premaster_secret,
3063 32);
3064 EVP_PKEY_free(pub_key);
3065
3066 }
3067 #ifndef OPENSSL_NO_SRP
3068 else if (alg_k & SSL_kSRP) {
3069 if (s->srp_ctx.A != NULL) {
3070 /* send off the data */
3071 n = BN_num_bytes(s->srp_ctx.A);
3072 s2n(n, p);
3073 BN_bn2bin(s->srp_ctx.A, p);
3074 n += 2;
3075 } else {
3076 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3077 ERR_R_INTERNAL_ERROR);
3078 goto err;
3079 }
3080 if (s->session->srp_username != NULL)
3081 OPENSSL_free(s->session->srp_username);
3082 s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3083 if (s->session->srp_username == NULL) {
3084 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3085 ERR_R_MALLOC_FAILURE);
3086 goto err;
3087 }
3088
3089 if ((s->session->master_key_length =
3090 SRP_generate_client_master_secret(s,
3091 s->session->master_key)) <
3092 0) {
3093 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3094 ERR_R_INTERNAL_ERROR);
3095 goto err;
3096 }
3097 }
3098 #endif
3099 #ifndef OPENSSL_NO_PSK
3100 else if (alg_k & SSL_kPSK) {
3101 /*
3102 * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a
3103 * \0-terminated identity. The last byte is for us for simulating
3104 * strnlen.
3105 */
3106 char identity[PSK_MAX_IDENTITY_LEN + 2];
3107 size_t identity_len;
3108 unsigned char *t = NULL;
3109 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4];
3110 unsigned int pre_ms_len = 0, psk_len = 0;
3111 int psk_err = 1;
3112
3113 n = 0;
3114 if (s->psk_client_callback == NULL) {
3115 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3116 SSL_R_PSK_NO_CLIENT_CB);
3117 goto err;
3118 }
3119
3120 memset(identity, 0, sizeof(identity));
3121 psk_len = s->psk_client_callback(s, s->session->psk_identity_hint,
3122 identity, sizeof(identity) - 1,
3123 psk_or_pre_ms,
3124 sizeof(psk_or_pre_ms));
3125 if (psk_len > PSK_MAX_PSK_LEN) {
3126 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3127 ERR_R_INTERNAL_ERROR);
3128 goto psk_err;
3129 } else if (psk_len == 0) {
3130 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3131 SSL_R_PSK_IDENTITY_NOT_FOUND);
3132 goto psk_err;
3133 }
3134 identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
3135 identity_len = strlen(identity);
3136 if (identity_len > PSK_MAX_IDENTITY_LEN) {
3137 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3138 ERR_R_INTERNAL_ERROR);
3139 goto psk_err;
3140 }
3141 /* create PSK pre_master_secret */
3142 pre_ms_len = 2 + psk_len + 2 + psk_len;
3143 t = psk_or_pre_ms;
3144 memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len);
3145 s2n(psk_len, t);
3146 memset(t, 0, psk_len);
3147 t += psk_len;
3148 s2n(psk_len, t);
3149
3150 if (s->session->psk_identity_hint != NULL)
3151 OPENSSL_free(s->session->psk_identity_hint);
3152 s->session->psk_identity_hint =
3153 BUF_strdup(s->ctx->psk_identity_hint);
3154 if (s->ctx->psk_identity_hint != NULL
3155 && s->session->psk_identity_hint == NULL) {
3156 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3157 ERR_R_MALLOC_FAILURE);
3158 goto psk_err;
3159 }
3160
3161 if (s->session->psk_identity != NULL)
3162 OPENSSL_free(s->session->psk_identity);
3163 s->session->psk_identity = BUF_strdup(identity);
3164 if (s->session->psk_identity == NULL) {
3165 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3166 ERR_R_MALLOC_FAILURE);
3167 goto psk_err;
3168 }
3169
3170 s->session->master_key_length =
3171 s->method->ssl3_enc->generate_master_secret(s,
3172 s->
3173 session->master_key,
3174 psk_or_pre_ms,
3175 pre_ms_len);
3176 s2n(identity_len, p);
3177 memcpy(p, identity, identity_len);
3178 n = 2 + identity_len;
3179 psk_err = 0;
3180 psk_err:
3181 OPENSSL_cleanse(identity, sizeof(identity));
3182 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3183 if (psk_err != 0) {
3184 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3185 goto err;
3186 }
3187 }
3188 #endif
3189 else {
3190 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3191 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
3192 goto err;
3193 }
3194
3195 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3196 s->state = SSL3_ST_CW_KEY_EXCH_B;
3197 }
3198
3199 /* SSL3_ST_CW_KEY_EXCH_B */
3200 return ssl_do_write(s);
3201 err:
3202 #ifndef OPENSSL_NO_ECDH
3203 BN_CTX_free(bn_ctx);
3204 if (encodedPoint != NULL)
3205 OPENSSL_free(encodedPoint);
3206 if (clnt_ecdh != NULL)
3207 EC_KEY_free(clnt_ecdh);
3208 EVP_PKEY_free(srvr_pub_pkey);
3209 #endif
3210 s->state = SSL_ST_ERR;
3211 return (-1);
3212 }
3213
ssl3_send_client_verify(SSL * s)3214 int ssl3_send_client_verify(SSL *s)
3215 {
3216 unsigned char *p;
3217 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
3218 EVP_PKEY *pkey;
3219 EVP_PKEY_CTX *pctx = NULL;
3220 EVP_MD_CTX mctx;
3221 unsigned u = 0;
3222 unsigned long n;
3223 int j;
3224
3225 EVP_MD_CTX_init(&mctx);
3226
3227 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
3228 p = ssl_handshake_start(s);
3229 pkey = s->cert->key->privatekey;
3230 /* Create context from key and test if sha1 is allowed as digest */
3231 pctx = EVP_PKEY_CTX_new(pkey, NULL);
3232 if (pctx == NULL || EVP_PKEY_sign_init(pctx) <= 0) {
3233 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3234 goto err;
3235 }
3236 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) > 0) {
3237 if (!SSL_USE_SIGALGS(s))
3238 s->method->ssl3_enc->cert_verify_mac(s,
3239 NID_sha1,
3240 &(data
3241 [MD5_DIGEST_LENGTH]));
3242 } else {
3243 ERR_clear_error();
3244 }
3245 /*
3246 * For TLS v1.2 send signature algorithm and signature using agreed
3247 * digest and cached handshake records.
3248 */
3249 if (SSL_USE_SIGALGS(s)) {
3250 long hdatalen = 0;
3251 void *hdata;
3252 const EVP_MD *md = s->cert->key->digest;
3253 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3254 if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) {
3255 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3256 goto err;
3257 }
3258 p += 2;
3259 #ifdef SSL_DEBUG
3260 fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3261 EVP_MD_name(md));
3262 #endif
3263 if (!EVP_SignInit_ex(&mctx, md, NULL)
3264 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3265 || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) {
3266 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_EVP_LIB);
3267 goto err;
3268 }
3269 s2n(u, p);
3270 n = u + 4;
3271 if (!ssl3_digest_cached_records(s))
3272 goto err;
3273 } else
3274 #ifndef OPENSSL_NO_RSA
3275 if (pkey->type == EVP_PKEY_RSA) {
3276 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0]));
3277 if (RSA_sign(NID_md5_sha1, data,
3278 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
3279 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
3280 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
3281 goto err;
3282 }
3283 s2n(u, p);
3284 n = u + 2;
3285 } else
3286 #endif
3287 #ifndef OPENSSL_NO_DSA
3288 if (pkey->type == EVP_PKEY_DSA) {
3289 if (!DSA_sign(pkey->save_type,
3290 &(data[MD5_DIGEST_LENGTH]),
3291 SHA_DIGEST_LENGTH, &(p[2]),
3292 (unsigned int *)&j, pkey->pkey.dsa)) {
3293 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
3294 goto err;
3295 }
3296 s2n(j, p);
3297 n = j + 2;
3298 } else
3299 #endif
3300 #ifndef OPENSSL_NO_ECDSA
3301 if (pkey->type == EVP_PKEY_EC) {
3302 if (!ECDSA_sign(pkey->save_type,
3303 &(data[MD5_DIGEST_LENGTH]),
3304 SHA_DIGEST_LENGTH, &(p[2]),
3305 (unsigned int *)&j, pkey->pkey.ec)) {
3306 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
3307 goto err;
3308 }
3309 s2n(j, p);
3310 n = j + 2;
3311 } else
3312 #endif
3313 if (pkey->type == NID_id_GostR3410_94
3314 || pkey->type == NID_id_GostR3410_2001) {
3315 unsigned char signbuf[64];
3316 int i;
3317 size_t sigsize = 64;
3318 s->method->ssl3_enc->cert_verify_mac(s,
3319 NID_id_GostR3411_94, data);
3320 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3321 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3322 goto err;
3323 }
3324 for (i = 63, j = 0; i >= 0; j++, i--) {
3325 p[2 + j] = signbuf[i];
3326 }
3327 s2n(j, p);
3328 n = j + 2;
3329 } else {
3330 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
3331 goto err;
3332 }
3333 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3334 s->state = SSL3_ST_CW_CERT_VRFY_B;
3335 }
3336 EVP_MD_CTX_cleanup(&mctx);
3337 EVP_PKEY_CTX_free(pctx);
3338 return ssl_do_write(s);
3339 err:
3340 EVP_MD_CTX_cleanup(&mctx);
3341 EVP_PKEY_CTX_free(pctx);
3342 s->state = SSL_ST_ERR;
3343 return (-1);
3344 }
3345
3346 /*
3347 * Check a certificate can be used for client authentication. Currently check
3348 * cert exists, if we have a suitable digest for TLS 1.2 if static DH client
3349 * certificates can be used and optionally checks suitability for Suite B.
3350 */
ssl3_check_client_certificate(SSL * s)3351 static int ssl3_check_client_certificate(SSL *s)
3352 {
3353 unsigned long alg_k;
3354 if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3355 return 0;
3356 /* If no suitable signature algorithm can't use certificate */
3357 if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3358 return 0;
3359 /*
3360 * If strict mode check suitability of chain before using it. This also
3361 * adjusts suite B digest if necessary.
3362 */
3363 if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3364 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3365 return 0;
3366 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3367 /* See if we can use client certificate for fixed DH */
3368 if (alg_k & (SSL_kDHr | SSL_kDHd)) {
3369 SESS_CERT *scert = s->session->sess_cert;
3370 int i = scert->peer_cert_type;
3371 EVP_PKEY *clkey = NULL, *spkey = NULL;
3372 clkey = s->cert->key->privatekey;
3373 /* If client key not DH assume it can be used */
3374 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3375 return 1;
3376 if (i >= 0)
3377 spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3378 if (spkey) {
3379 /* Compare server and client parameters */
3380 i = EVP_PKEY_cmp_parameters(clkey, spkey);
3381 EVP_PKEY_free(spkey);
3382 if (i != 1)
3383 return 0;
3384 }
3385 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3386 }
3387 return 1;
3388 }
3389
ssl3_send_client_certificate(SSL * s)3390 int ssl3_send_client_certificate(SSL *s)
3391 {
3392 X509 *x509 = NULL;
3393 EVP_PKEY *pkey = NULL;
3394 int i;
3395
3396 if (s->state == SSL3_ST_CW_CERT_A) {
3397 /* Let cert callback update client certificates if required */
3398 if (s->cert->cert_cb) {
3399 i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3400 if (i < 0) {
3401 s->rwstate = SSL_X509_LOOKUP;
3402 return -1;
3403 }
3404 if (i == 0) {
3405 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3406 s->state = SSL_ST_ERR;
3407 return 0;
3408 }
3409 s->rwstate = SSL_NOTHING;
3410 }
3411 if (ssl3_check_client_certificate(s))
3412 s->state = SSL3_ST_CW_CERT_C;
3413 else
3414 s->state = SSL3_ST_CW_CERT_B;
3415 }
3416
3417 /* We need to get a client cert */
3418 if (s->state == SSL3_ST_CW_CERT_B) {
3419 /*
3420 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
3421 * return(-1); We then get retied later
3422 */
3423 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3424 if (i < 0) {
3425 s->rwstate = SSL_X509_LOOKUP;
3426 return (-1);
3427 }
3428 s->rwstate = SSL_NOTHING;
3429 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
3430 s->state = SSL3_ST_CW_CERT_B;
3431 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
3432 i = 0;
3433 } else if (i == 1) {
3434 i = 0;
3435 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,
3436 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3437 }
3438
3439 if (x509 != NULL)
3440 X509_free(x509);
3441 if (pkey != NULL)
3442 EVP_PKEY_free(pkey);
3443 if (i && !ssl3_check_client_certificate(s))
3444 i = 0;
3445 if (i == 0) {
3446 if (s->version == SSL3_VERSION) {
3447 s->s3->tmp.cert_req = 0;
3448 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
3449 return (1);
3450 } else {
3451 s->s3->tmp.cert_req = 2;
3452 }
3453 }
3454
3455 /* Ok, we have a cert */
3456 s->state = SSL3_ST_CW_CERT_C;
3457 }
3458
3459 if (s->state == SSL3_ST_CW_CERT_C) {
3460 s->state = SSL3_ST_CW_CERT_D;
3461 if (!ssl3_output_cert_chain(s,
3462 (s->s3->tmp.cert_req ==
3463 2) ? NULL : s->cert->key)) {
3464 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3465 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
3466 s->state = SSL_ST_ERR;
3467 return 0;
3468 }
3469 }
3470 /* SSL3_ST_CW_CERT_D */
3471 return ssl_do_write(s);
3472 }
3473
3474 #define has_bits(i,m) (((i)&(m)) == (m))
3475
ssl3_check_cert_and_algorithm(SSL * s)3476 int ssl3_check_cert_and_algorithm(SSL *s)
3477 {
3478 int i, idx;
3479 long alg_k, alg_a;
3480 EVP_PKEY *pkey = NULL;
3481 int pkey_bits;
3482 SESS_CERT *sc;
3483 #ifndef OPENSSL_NO_RSA
3484 RSA *rsa;
3485 #endif
3486 #ifndef OPENSSL_NO_DH
3487 DH *dh;
3488 #endif
3489 int al = SSL_AD_HANDSHAKE_FAILURE;
3490
3491 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
3492 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
3493
3494 /* we don't have a certificate */
3495 if ((alg_a & (SSL_aNULL | SSL_aKRB5)) || (alg_k & SSL_kPSK))
3496 return (1);
3497
3498 sc = s->session->sess_cert;
3499 if (sc == NULL) {
3500 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
3501 goto err;
3502 }
3503 #ifndef OPENSSL_NO_RSA
3504 rsa = s->session->sess_cert->peer_rsa_tmp;
3505 #endif
3506 #ifndef OPENSSL_NO_DH
3507 dh = s->session->sess_cert->peer_dh_tmp;
3508 #endif
3509
3510 /* This is the passed certificate */
3511
3512 idx = sc->peer_cert_type;
3513 #ifndef OPENSSL_NO_ECDH
3514 if (idx == SSL_PKEY_ECC) {
3515 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, s) == 0) {
3516 /* check failed */
3517 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
3518 goto f_err;
3519 } else {
3520 return 1;
3521 }
3522 } else if (alg_a & SSL_aECDSA) {
3523 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3524 SSL_R_MISSING_ECDSA_SIGNING_CERT);
3525 goto f_err;
3526 } else if (alg_k & (SSL_kECDHr | SSL_kECDHe)) {
3527 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_ECDH_CERT);
3528 goto f_err;
3529 }
3530 #endif
3531 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
3532 pkey_bits = EVP_PKEY_bits(pkey);
3533 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
3534 EVP_PKEY_free(pkey);
3535
3536 /* Check that we have a certificate if we require one */
3537 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
3538 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3539 SSL_R_MISSING_RSA_SIGNING_CERT);
3540 goto f_err;
3541 }
3542 #ifndef OPENSSL_NO_DSA
3543 else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
3544 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3545 SSL_R_MISSING_DSA_SIGNING_CERT);
3546 goto f_err;
3547 }
3548 #endif
3549 #ifndef OPENSSL_NO_RSA
3550 if (alg_k & SSL_kRSA) {
3551 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
3552 !has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) {
3553 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3554 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3555 goto f_err;
3556 } else if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
3557 if (pkey_bits <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3558 if (!has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) {
3559 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3560 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3561 goto f_err;
3562 }
3563 if (rsa != NULL) {
3564 /* server key exchange is not allowed. */
3565 al = SSL_AD_INTERNAL_ERROR;
3566 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
3567 goto f_err;
3568 }
3569 }
3570 }
3571 }
3572 #endif
3573 #ifndef OPENSSL_NO_DH
3574 if ((alg_k & SSL_kEDH) && dh == NULL) {
3575 al = SSL_AD_INTERNAL_ERROR;
3576 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
3577 goto f_err;
3578 }
3579 if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3580 !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) {
3581 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3582 SSL_R_MISSING_DH_RSA_CERT);
3583 goto f_err;
3584 }
3585 # ifndef OPENSSL_NO_DSA
3586 if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3587 !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) {
3588 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3589 SSL_R_MISSING_DH_DSA_CERT);
3590 goto f_err;
3591 }
3592 # endif
3593
3594 if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd)) {
3595 int dh_size;
3596 if (alg_k & SSL_kDHE) {
3597 dh_size = BN_num_bits(dh->p);
3598 } else {
3599 DH *dh_srvr = get_server_static_dh_key(sc);
3600 if (dh_srvr == NULL)
3601 goto f_err;
3602 dh_size = BN_num_bits(dh_srvr->p);
3603 DH_free(dh_srvr);
3604 }
3605
3606 if ((!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 768)
3607 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 512)) {
3608 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_DH_KEY_TOO_SMALL);
3609 goto f_err;
3610 }
3611 }
3612 #endif /* !OPENSSL_NO_DH */
3613
3614 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
3615 pkey_bits > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3616 #ifndef OPENSSL_NO_RSA
3617 if (alg_k & SSL_kRSA) {
3618 if (rsa == NULL) {
3619 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3620 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3621 goto f_err;
3622 } else if (BN_num_bits(rsa->n) >
3623 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3624 /* We have a temporary RSA key but it's too large. */
3625 al = SSL_AD_EXPORT_RESTRICTION;
3626 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3627 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3628 goto f_err;
3629 }
3630 } else
3631 #endif
3632 #ifndef OPENSSL_NO_DH
3633 if (alg_k & SSL_kDHE) {
3634 if (BN_num_bits(dh->p) >
3635 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
3636 /* We have a temporary DH key but it's too large. */
3637 al = SSL_AD_EXPORT_RESTRICTION;
3638 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3639 SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3640 goto f_err;
3641 }
3642 } else if (alg_k & (SSL_kDHr | SSL_kDHd)) {
3643 /* The cert should have had an export DH key. */
3644 al = SSL_AD_EXPORT_RESTRICTION;
3645 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3646 SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3647 goto f_err;
3648 } else
3649 #endif
3650 {
3651 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
3652 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3653 goto f_err;
3654 }
3655 }
3656 return (1);
3657 f_err:
3658 ssl3_send_alert(s, SSL3_AL_FATAL, al);
3659 err:
3660 return (0);
3661 }
3662
3663 #ifndef OPENSSL_NO_TLSEXT
3664 /*
3665 * Normally, we can tell if the server is resuming the session from
3666 * the session ID. EAP-FAST (RFC 4851), however, relies on the next server
3667 * message after the ServerHello to determine if the server is resuming.
3668 * Therefore, we allow EAP-FAST to peek ahead.
3669 * ssl3_check_finished returns 1 if we are resuming from an external
3670 * pre-shared secret, we have a "ticket" and the next server handshake message
3671 * is Finished; and 0 otherwise. It returns -1 upon an error.
3672 */
ssl3_check_finished(SSL * s)3673 static int ssl3_check_finished(SSL *s)
3674 {
3675 int ok = 0;
3676
3677 if (s->version < TLS1_VERSION || !s->tls_session_secret_cb ||
3678 !s->session->tlsext_tick)
3679 return 0;
3680
3681 /* Need to permit this temporarily, in case the next message is Finished. */
3682 s->s3->flags |= SSL3_FLAGS_CCS_OK;
3683 /*
3684 * This function is called when we might get a Certificate message instead,
3685 * so permit appropriate message length.
3686 * We ignore the return value as we're only interested in the message type
3687 * and not its length.
3688 */
3689 s->method->ssl_get_message(s,
3690 SSL3_ST_CR_CERT_A,
3691 SSL3_ST_CR_CERT_B,
3692 -1, s->max_cert_list, &ok);
3693 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
3694
3695 if (!ok)
3696 return -1;
3697
3698 s->s3->tmp.reuse_message = 1;
3699
3700 if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
3701 return 1;
3702
3703 /* If we're not done, then the CCS arrived early and we should bail. */
3704 if (s->s3->change_cipher_spec) {
3705 SSLerr(SSL_F_SSL3_CHECK_FINISHED, SSL_R_CCS_RECEIVED_EARLY);
3706 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
3707 return -1;
3708 }
3709
3710 return 0;
3711 }
3712
3713 # ifndef OPENSSL_NO_NEXTPROTONEG
ssl3_send_next_proto(SSL * s)3714 int ssl3_send_next_proto(SSL *s)
3715 {
3716 unsigned int len, padding_len;
3717 unsigned char *d;
3718
3719 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) {
3720 len = s->next_proto_negotiated_len;
3721 padding_len = 32 - ((len + 2) % 32);
3722 d = (unsigned char *)s->init_buf->data;
3723 d[4] = len;
3724 memcpy(d + 5, s->next_proto_negotiated, len);
3725 d[5 + len] = padding_len;
3726 memset(d + 6 + len, 0, padding_len);
3727 *(d++) = SSL3_MT_NEXT_PROTO;
3728 l2n3(2 + len + padding_len, d);
3729 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3730 s->init_num = 4 + 2 + len + padding_len;
3731 s->init_off = 0;
3732 }
3733
3734 return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3735 }
3736 #endif /* !OPENSSL_NO_NEXTPROTONEG */
3737 #endif /* !OPENSSL_NO_TLSEXT */
3738
ssl_do_client_cert_cb(SSL * s,X509 ** px509,EVP_PKEY ** ppkey)3739 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3740 {
3741 int i = 0;
3742 #ifndef OPENSSL_NO_ENGINE
3743 if (s->ctx->client_cert_engine) {
3744 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3745 SSL_get_client_CA_list(s),
3746 px509, ppkey, NULL, NULL, NULL);
3747 if (i != 0)
3748 return i;
3749 }
3750 #endif
3751 if (s->ctx->client_cert_cb)
3752 i = s->ctx->client_cert_cb(s, px509, ppkey);
3753 return i;
3754 }
3755