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Fix race condition in NewSessionTicket
[thirdparty/openssl.git] / ssl / s3_clnt.c
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) 1998-2003 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 #include <stdio.h>
126 #include "ssl_locl.h"
127 #include "kssl_lcl.h"
128 #include <openssl/buffer.h>
129 #include <openssl/rand.h>
130 #include <openssl/objects.h>
131 #include <openssl/evp.h>
132 #include <openssl/md5.h>
133 #ifdef OPENSSL_FIPS
134 # include <openssl/fips.h>
135 #endif
136
137 #ifndef OPENSSL_NO_DH
138 # include <openssl/dh.h>
139 #endif
140 #include <openssl/bn.h>
141 #ifndef OPENSSL_NO_ENGINE
142 # include <openssl/engine.h>
143 #endif
144
145 static SSL_METHOD *ssl3_get_client_method(int ver);
146 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b);
147
148 #ifndef OPENSSL_NO_ECDH
149 static int curve_id2nid(int curve_id);
150 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
151 #endif
152
153 static SSL_METHOD *ssl3_get_client_method(int ver)
154 {
155 if (ver == SSL3_VERSION)
156 return (SSLv3_client_method());
157 else
158 return (NULL);
159 }
160
161 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
162 ssl_undefined_function,
163 ssl3_connect, ssl3_get_client_method)
164
165 int ssl3_connect(SSL *s)
166 {
167 BUF_MEM *buf = NULL;
168 unsigned long Time = (unsigned long)time(NULL);
169 void (*cb) (const SSL *ssl, int type, int val) = NULL;
170 int ret = -1;
171 int new_state, state, skip = 0;
172
173 RAND_add(&Time, sizeof(Time), 0);
174 ERR_clear_error();
175 clear_sys_error();
176
177 if (s->info_callback != NULL)
178 cb = s->info_callback;
179 else if (s->ctx->info_callback != NULL)
180 cb = s->ctx->info_callback;
181
182 s->in_handshake++;
183 if (!SSL_in_init(s) || SSL_in_before(s))
184 SSL_clear(s);
185
186 for (;;) {
187 state = s->state;
188
189 switch (s->state) {
190 case SSL_ST_RENEGOTIATE:
191 s->new_session = 1;
192 s->state = SSL_ST_CONNECT;
193 s->ctx->stats.sess_connect_renegotiate++;
194 /* break */
195 case SSL_ST_BEFORE:
196 case SSL_ST_CONNECT:
197 case SSL_ST_BEFORE | SSL_ST_CONNECT:
198 case SSL_ST_OK | SSL_ST_CONNECT:
199
200 s->server = 0;
201 if (cb != NULL)
202 cb(s, SSL_CB_HANDSHAKE_START, 1);
203
204 if ((s->version & 0xff00) != 0x0300) {
205 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
206 ret = -1;
207 goto end;
208 }
209
210 /* s->version=SSL3_VERSION; */
211 s->type = SSL_ST_CONNECT;
212
213 if (s->init_buf == NULL) {
214 if ((buf = BUF_MEM_new()) == NULL) {
215 ret = -1;
216 goto end;
217 }
218 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
219 ret = -1;
220 goto end;
221 }
222 s->init_buf = buf;
223 buf = NULL;
224 }
225
226 if (!ssl3_setup_buffers(s)) {
227 ret = -1;
228 goto end;
229 }
230
231 /* setup buffing BIO */
232 if (!ssl_init_wbio_buffer(s, 0)) {
233 ret = -1;
234 goto end;
235 }
236
237 /* don't push the buffering BIO quite yet */
238
239 ssl3_init_finished_mac(s);
240
241 s->state = SSL3_ST_CW_CLNT_HELLO_A;
242 s->ctx->stats.sess_connect++;
243 s->init_num = 0;
244 break;
245
246 case SSL3_ST_CW_CLNT_HELLO_A:
247 case SSL3_ST_CW_CLNT_HELLO_B:
248
249 s->shutdown = 0;
250 ret = ssl3_client_hello(s);
251 if (ret <= 0)
252 goto end;
253 s->state = SSL3_ST_CR_SRVR_HELLO_A;
254 s->init_num = 0;
255
256 /* turn on buffering for the next lot of output */
257 if (s->bbio != s->wbio)
258 s->wbio = BIO_push(s->bbio, s->wbio);
259
260 break;
261
262 case SSL3_ST_CR_SRVR_HELLO_A:
263 case SSL3_ST_CR_SRVR_HELLO_B:
264 ret = ssl3_get_server_hello(s);
265 if (ret <= 0)
266 goto end;
267 if (s->hit) {
268 s->state = SSL3_ST_CR_FINISHED_A;
269 #ifndef OPENSSL_NO_TLSEXT
270 if (s->tlsext_ticket_expected) {
271 /* receive renewed session ticket */
272 s->state = SSL3_ST_CR_SESSION_TICKET_A;
273 }
274 #endif
275 } else
276 s->state = SSL3_ST_CR_CERT_A;
277 s->init_num = 0;
278 break;
279
280 case SSL3_ST_CR_CERT_A:
281 case SSL3_ST_CR_CERT_B:
282 #ifndef OPENSSL_NO_TLSEXT
283 ret = ssl3_check_finished(s);
284 if (ret <= 0)
285 goto end;
286 if (ret == 2) {
287 s->hit = 1;
288 if (s->tlsext_ticket_expected)
289 s->state = SSL3_ST_CR_SESSION_TICKET_A;
290 else
291 s->state = SSL3_ST_CR_FINISHED_A;
292 s->init_num = 0;
293 break;
294 }
295 #endif
296 /* Check if it is anon DH/ECDH */
297 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) {
298 ret = ssl3_get_server_certificate(s);
299 if (ret <= 0)
300 goto end;
301 #ifndef OPENSSL_NO_TLSEXT
302 if (s->tlsext_status_expected)
303 s->state = SSL3_ST_CR_CERT_STATUS_A;
304 else
305 s->state = SSL3_ST_CR_KEY_EXCH_A;
306 } else {
307 skip = 1;
308 s->state = SSL3_ST_CR_KEY_EXCH_A;
309 }
310 #else
311 } else
312 skip = 1;
313
314 s->state = SSL3_ST_CR_KEY_EXCH_A;
315 #endif
316 s->init_num = 0;
317 break;
318
319 case SSL3_ST_CR_KEY_EXCH_A:
320 case SSL3_ST_CR_KEY_EXCH_B:
321 ret = ssl3_get_key_exchange(s);
322 if (ret <= 0)
323 goto end;
324 s->state = SSL3_ST_CR_CERT_REQ_A;
325 s->init_num = 0;
326
327 /*
328 * at this point we check that we have the required stuff from
329 * the server
330 */
331 if (!ssl3_check_cert_and_algorithm(s)) {
332 ret = -1;
333 goto end;
334 }
335 break;
336
337 case SSL3_ST_CR_CERT_REQ_A:
338 case SSL3_ST_CR_CERT_REQ_B:
339 ret = ssl3_get_certificate_request(s);
340 if (ret <= 0)
341 goto end;
342 s->state = SSL3_ST_CR_SRVR_DONE_A;
343 s->init_num = 0;
344 break;
345
346 case SSL3_ST_CR_SRVR_DONE_A:
347 case SSL3_ST_CR_SRVR_DONE_B:
348 ret = ssl3_get_server_done(s);
349 if (ret <= 0)
350 goto end;
351 if (s->s3->tmp.cert_req)
352 s->state = SSL3_ST_CW_CERT_A;
353 else
354 s->state = SSL3_ST_CW_KEY_EXCH_A;
355 s->init_num = 0;
356
357 break;
358
359 case SSL3_ST_CW_CERT_A:
360 case SSL3_ST_CW_CERT_B:
361 case SSL3_ST_CW_CERT_C:
362 case SSL3_ST_CW_CERT_D:
363 ret = ssl3_send_client_certificate(s);
364 if (ret <= 0)
365 goto end;
366 s->state = SSL3_ST_CW_KEY_EXCH_A;
367 s->init_num = 0;
368 break;
369
370 case SSL3_ST_CW_KEY_EXCH_A:
371 case SSL3_ST_CW_KEY_EXCH_B:
372 ret = ssl3_send_client_key_exchange(s);
373 if (ret <= 0)
374 goto end;
375 /*
376 * EAY EAY EAY need to check for DH fix cert sent back
377 */
378 /*
379 * For TLS, cert_req is set to 2, so a cert chain of nothing is
380 * sent, but no verify packet is sent
381 */
382 /*
383 * XXX: For now, we do not support client authentication in ECDH
384 * cipher suites with ECDH (rather than ECDSA) certificates. We
385 * need to skip the certificate verify message when client's
386 * ECDH public key is sent inside the client certificate.
387 */
388 if (s->s3->tmp.cert_req == 1) {
389 s->state = SSL3_ST_CW_CERT_VRFY_A;
390 } else {
391 s->state = SSL3_ST_CW_CHANGE_A;
392 s->s3->change_cipher_spec = 0;
393 }
394
395 s->init_num = 0;
396 break;
397
398 case SSL3_ST_CW_CERT_VRFY_A:
399 case SSL3_ST_CW_CERT_VRFY_B:
400 ret = ssl3_send_client_verify(s);
401 if (ret <= 0)
402 goto end;
403 s->state = SSL3_ST_CW_CHANGE_A;
404 s->init_num = 0;
405 s->s3->change_cipher_spec = 0;
406 break;
407
408 case SSL3_ST_CW_CHANGE_A:
409 case SSL3_ST_CW_CHANGE_B:
410 ret = ssl3_send_change_cipher_spec(s,
411 SSL3_ST_CW_CHANGE_A,
412 SSL3_ST_CW_CHANGE_B);
413 if (ret <= 0)
414 goto end;
415 s->state = SSL3_ST_CW_FINISHED_A;
416 s->init_num = 0;
417
418 s->session->cipher = s->s3->tmp.new_cipher;
419 #ifdef OPENSSL_NO_COMP
420 s->session->compress_meth = 0;
421 #else
422 if (s->s3->tmp.new_compression == NULL)
423 s->session->compress_meth = 0;
424 else
425 s->session->compress_meth = s->s3->tmp.new_compression->id;
426 #endif
427 if (!s->method->ssl3_enc->setup_key_block(s)) {
428 ret = -1;
429 goto end;
430 }
431
432 if (!s->method->ssl3_enc->change_cipher_state(s,
433 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
434 {
435 ret = -1;
436 goto end;
437 }
438
439 break;
440
441 case SSL3_ST_CW_FINISHED_A:
442 case SSL3_ST_CW_FINISHED_B:
443 ret = ssl3_send_finished(s,
444 SSL3_ST_CW_FINISHED_A,
445 SSL3_ST_CW_FINISHED_B,
446 s->method->
447 ssl3_enc->client_finished_label,
448 s->method->
449 ssl3_enc->client_finished_label_len);
450 if (ret <= 0)
451 goto end;
452 s->s3->flags |= SSL3_FLAGS_CCS_OK;
453 s->state = SSL3_ST_CW_FLUSH;
454
455 /* clear flags */
456 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
457 if (s->hit) {
458 s->s3->tmp.next_state = SSL_ST_OK;
459 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
460 s->state = SSL_ST_OK;
461 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
462 s->s3->delay_buf_pop_ret = 0;
463 }
464 } else {
465 #ifndef OPENSSL_NO_TLSEXT
466 /*
467 * Allow NewSessionTicket if ticket expected
468 */
469 if (s->tlsext_ticket_expected)
470 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
471 else
472 #endif
473
474 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
475 }
476 s->init_num = 0;
477 break;
478
479 #ifndef OPENSSL_NO_TLSEXT
480 case SSL3_ST_CR_SESSION_TICKET_A:
481 case SSL3_ST_CR_SESSION_TICKET_B:
482 ret = ssl3_get_new_session_ticket(s);
483 if (ret <= 0)
484 goto end;
485 s->state = SSL3_ST_CR_FINISHED_A;
486 s->init_num = 0;
487 break;
488
489 case SSL3_ST_CR_CERT_STATUS_A:
490 case SSL3_ST_CR_CERT_STATUS_B:
491 ret = ssl3_get_cert_status(s);
492 if (ret <= 0)
493 goto end;
494 s->state = SSL3_ST_CR_KEY_EXCH_A;
495 s->init_num = 0;
496 break;
497 #endif
498
499 case SSL3_ST_CR_FINISHED_A:
500 case SSL3_ST_CR_FINISHED_B:
501
502 s->s3->flags |= SSL3_FLAGS_CCS_OK;
503 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
504 SSL3_ST_CR_FINISHED_B);
505 if (ret <= 0)
506 goto end;
507
508 if (s->hit)
509 s->state = SSL3_ST_CW_CHANGE_A;
510 else
511 s->state = SSL_ST_OK;
512 s->init_num = 0;
513 break;
514
515 case SSL3_ST_CW_FLUSH:
516 s->rwstate = SSL_WRITING;
517 if (BIO_flush(s->wbio) <= 0) {
518 ret = -1;
519 goto end;
520 }
521 s->rwstate = SSL_NOTHING;
522 s->state = s->s3->tmp.next_state;
523 break;
524
525 case SSL_ST_OK:
526 /* clean a few things up */
527 ssl3_cleanup_key_block(s);
528
529 if (s->init_buf != NULL) {
530 BUF_MEM_free(s->init_buf);
531 s->init_buf = NULL;
532 }
533
534 /*
535 * If we are not 'joining' the last two packets, remove the
536 * buffering now
537 */
538 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
539 ssl_free_wbio_buffer(s);
540 /* else do it later in ssl3_write */
541
542 s->init_num = 0;
543 s->new_session = 0;
544
545 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
546 if (s->hit)
547 s->ctx->stats.sess_hit++;
548
549 ret = 1;
550 /* s->server=0; */
551 s->handshake_func = ssl3_connect;
552 s->ctx->stats.sess_connect_good++;
553
554 if (cb != NULL)
555 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
556
557 goto end;
558 /* break; */
559
560 default:
561 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_UNKNOWN_STATE);
562 ret = -1;
563 goto end;
564 /* break; */
565 }
566
567 /* did we do anything */
568 if (!s->s3->tmp.reuse_message && !skip) {
569 if (s->debug) {
570 if ((ret = BIO_flush(s->wbio)) <= 0)
571 goto end;
572 }
573
574 if ((cb != NULL) && (s->state != state)) {
575 new_state = s->state;
576 s->state = state;
577 cb(s, SSL_CB_CONNECT_LOOP, 1);
578 s->state = new_state;
579 }
580 }
581 skip = 0;
582 }
583 end:
584 s->in_handshake--;
585 if (buf != NULL)
586 BUF_MEM_free(buf);
587 if (cb != NULL)
588 cb(s, SSL_CB_CONNECT_EXIT, ret);
589 return (ret);
590 }
591
592 int ssl3_client_hello(SSL *s)
593 {
594 unsigned char *buf;
595 unsigned char *p, *d;
596 int i;
597 unsigned long Time, l;
598 #ifndef OPENSSL_NO_COMP
599 int j;
600 SSL_COMP *comp;
601 #endif
602
603 buf = (unsigned char *)s->init_buf->data;
604 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
605 SSL_SESSION *sess = s->session;
606 if ((sess == NULL) || (sess->ssl_version != s->version) ||
607 #ifdef OPENSSL_NO_TLSEXT
608 !sess->session_id_length ||
609 #else
610 (!sess->session_id_length && !sess->tlsext_tick) ||
611 #endif
612 (sess->not_resumable)) {
613 if (!ssl_get_new_session(s, 0))
614 goto err;
615 }
616 /* else use the pre-loaded session */
617
618 p = s->s3->client_random;
619 Time = (unsigned long)time(NULL); /* Time */
620 l2n(Time, p);
621 if (RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4) <= 0)
622 goto err;
623
624 /* Do the message type and length last */
625 d = p = &(buf[4]);
626
627 *(p++) = s->version >> 8;
628 *(p++) = s->version & 0xff;
629 s->client_version = s->version;
630
631 /* Random stuff */
632 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
633 p += SSL3_RANDOM_SIZE;
634
635 /* Session ID */
636 if (s->new_session)
637 i = 0;
638 else
639 i = s->session->session_id_length;
640 *(p++) = i;
641 if (i != 0) {
642 if (i > (int)sizeof(s->session->session_id)) {
643 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
644 goto err;
645 }
646 memcpy(p, s->session->session_id, i);
647 p += i;
648 }
649
650 /* Ciphers supported */
651 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
652 if (i == 0) {
653 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
654 goto err;
655 }
656 s2n(i, p);
657 p += i;
658
659 /* COMPRESSION */
660 #ifdef OPENSSL_NO_COMP
661 *(p++) = 1;
662 #else
663 if (s->ctx->comp_methods == NULL)
664 j = 0;
665 else
666 j = sk_SSL_COMP_num(s->ctx->comp_methods);
667 *(p++) = 1 + j;
668 for (i = 0; i < j; i++) {
669 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
670 *(p++) = comp->id;
671 }
672 #endif
673 *(p++) = 0; /* Add the NULL method */
674 #ifndef OPENSSL_NO_TLSEXT
675 if ((p =
676 ssl_add_clienthello_tlsext(s, p,
677 buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
678 NULL) {
679 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
680 goto err;
681 }
682 #endif
683 l = (p - d);
684 d = buf;
685 *(d++) = SSL3_MT_CLIENT_HELLO;
686 l2n3(l, d);
687
688 s->state = SSL3_ST_CW_CLNT_HELLO_B;
689 /* number of bytes to write */
690 s->init_num = p - buf;
691 s->init_off = 0;
692 }
693
694 /* SSL3_ST_CW_CLNT_HELLO_B */
695 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
696 err:
697 return (-1);
698 }
699
700 int ssl3_get_server_hello(SSL *s)
701 {
702 STACK_OF(SSL_CIPHER) *sk;
703 SSL_CIPHER *c;
704 unsigned char *p, *d;
705 int i, al, ok;
706 unsigned int j;
707 long n;
708 #ifndef OPENSSL_NO_COMP
709 SSL_COMP *comp;
710 #endif
711
712 n = s->method->ssl_get_message(s,
713 SSL3_ST_CR_SRVR_HELLO_A,
714 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok);
715
716 if (!ok)
717 return ((int)n);
718
719 if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER) {
720 if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
721 if (s->d1->send_cookie == 0) {
722 s->s3->tmp.reuse_message = 1;
723 return 1;
724 } else { /* already sent a cookie */
725
726 al = SSL_AD_UNEXPECTED_MESSAGE;
727 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
728 goto f_err;
729 }
730 }
731 }
732
733 if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) {
734 al = SSL_AD_UNEXPECTED_MESSAGE;
735 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE);
736 goto f_err;
737 }
738
739 d = p = (unsigned char *)s->init_msg;
740
741 if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) {
742 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION);
743 s->version = (s->version & 0xff00) | p[1];
744 al = SSL_AD_PROTOCOL_VERSION;
745 goto f_err;
746 }
747 p += 2;
748
749 /* load the server hello data */
750 /* load the server random */
751 memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE);
752 p += SSL3_RANDOM_SIZE;
753
754 /* get the session-id */
755 j = *(p++);
756
757 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) {
758 al = SSL_AD_ILLEGAL_PARAMETER;
759 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG);
760 goto f_err;
761 }
762
763 if (j != 0 && j == s->session->session_id_length
764 && memcmp(p, s->session->session_id, j) == 0) {
765 if (s->sid_ctx_length != s->session->sid_ctx_length
766 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
767 /* actually a client application bug */
768 al = SSL_AD_ILLEGAL_PARAMETER;
769 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
770 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
771 goto f_err;
772 }
773 s->s3->flags |= SSL3_FLAGS_CCS_OK;
774 s->hit = 1;
775 } else { /* a miss or crap from the other end */
776
777 /*
778 * If we were trying for session-id reuse, make a new SSL_SESSION so
779 * we don't stuff up other people
780 */
781 s->hit = 0;
782 if (s->session->session_id_length > 0) {
783 if (!ssl_get_new_session(s, 0)) {
784 al = SSL_AD_INTERNAL_ERROR;
785 goto f_err;
786 }
787 }
788 s->session->session_id_length = j;
789 memcpy(s->session->session_id, p, j); /* j could be 0 */
790 }
791 p += j;
792 c = ssl_get_cipher_by_char(s, p);
793 if (c == NULL) {
794 /* unknown cipher */
795 al = SSL_AD_ILLEGAL_PARAMETER;
796 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED);
797 goto f_err;
798 }
799 p += ssl_put_cipher_by_char(s, NULL, NULL);
800
801 sk = ssl_get_ciphers_by_id(s);
802 i = sk_SSL_CIPHER_find(sk, c);
803 if (i < 0) {
804 /* we did not say we would use this cipher */
805 al = SSL_AD_ILLEGAL_PARAMETER;
806 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
807 goto f_err;
808 }
809
810 /*
811 * Depending on the session caching (internal/external), the cipher
812 * and/or cipher_id values may not be set. Make sure that cipher_id is
813 * set and use it for comparison.
814 */
815 if (s->session->cipher)
816 s->session->cipher_id = s->session->cipher->id;
817 if (s->hit && (s->session->cipher_id != c->id)) {
818 /* Workaround is now obsolete */
819 #if 0
820 if (!(s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
821 #endif
822 {
823 al = SSL_AD_ILLEGAL_PARAMETER;
824 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
825 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
826 goto f_err;
827 }
828 }
829 s->s3->tmp.new_cipher = c;
830
831 /* lets get the compression algorithm */
832 /* COMPRESSION */
833 #ifdef OPENSSL_NO_COMP
834 if (*(p++) != 0) {
835 al = SSL_AD_ILLEGAL_PARAMETER;
836 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
837 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
838 goto f_err;
839 }
840 #else
841 j = *(p++);
842 if (j == 0)
843 comp = NULL;
844 else
845 comp = ssl3_comp_find(s->ctx->comp_methods, j);
846
847 if ((j != 0) && (comp == NULL)) {
848 al = SSL_AD_ILLEGAL_PARAMETER;
849 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
850 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
851 goto f_err;
852 } else {
853 s->s3->tmp.new_compression = comp;
854 }
855 #endif
856 #ifndef OPENSSL_NO_TLSEXT
857 /* TLS extensions */
858 if (s->version >= SSL3_VERSION) {
859 if (!ssl_parse_serverhello_tlsext(s, &p, d, n, &al)) {
860 /* 'al' set by ssl_parse_serverhello_tlsext */
861 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT);
862 goto f_err;
863 }
864 if (ssl_check_serverhello_tlsext(s) <= 0) {
865 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
866 goto err;
867 }
868 }
869 #endif
870
871 if (p != (d + n)) {
872 /* wrong packet length */
873 al = SSL_AD_DECODE_ERROR;
874 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH);
875 goto f_err;
876 }
877
878 return (1);
879 f_err:
880 ssl3_send_alert(s, SSL3_AL_FATAL, al);
881 #ifndef OPENSSL_NO_TLSEXT
882 err:
883 #endif
884 return (-1);
885 }
886
887 int ssl3_get_server_certificate(SSL *s)
888 {
889 int al, i, ok, ret = -1;
890 unsigned long n, nc, llen, l;
891 X509 *x = NULL;
892 const unsigned char *q, *p;
893 unsigned char *d;
894 STACK_OF(X509) *sk = NULL;
895 SESS_CERT *sc;
896 EVP_PKEY *pkey = NULL;
897 int need_cert = 1; /* VRS: 0=> will allow null cert if auth ==
898 * KRB5 */
899
900 n = s->method->ssl_get_message(s,
901 SSL3_ST_CR_CERT_A,
902 SSL3_ST_CR_CERT_B,
903 -1, s->max_cert_list, &ok);
904
905 if (!ok)
906 return ((int)n);
907
908 if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
909 ((s->s3->tmp.new_cipher->algorithms & SSL_aKRB5) &&
910 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE))) {
911 s->s3->tmp.reuse_message = 1;
912 return (1);
913 }
914
915 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) {
916 al = SSL_AD_UNEXPECTED_MESSAGE;
917 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE);
918 goto f_err;
919 }
920 p = d = (unsigned char *)s->init_msg;
921
922 if ((sk = sk_X509_new_null()) == NULL) {
923 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
924 goto err;
925 }
926
927 n2l3(p, llen);
928 if (llen + 3 != n) {
929 al = SSL_AD_DECODE_ERROR;
930 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
931 goto f_err;
932 }
933 for (nc = 0; nc < llen;) {
934 n2l3(p, l);
935 if ((l + nc + 3) > llen) {
936 al = SSL_AD_DECODE_ERROR;
937 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
938 SSL_R_CERT_LENGTH_MISMATCH);
939 goto f_err;
940 }
941
942 q = p;
943 x = d2i_X509(NULL, &q, l);
944 if (x == NULL) {
945 al = SSL_AD_BAD_CERTIFICATE;
946 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB);
947 goto f_err;
948 }
949 if (q != (p + l)) {
950 al = SSL_AD_DECODE_ERROR;
951 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
952 SSL_R_CERT_LENGTH_MISMATCH);
953 goto f_err;
954 }
955 if (!sk_X509_push(sk, x)) {
956 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
957 goto err;
958 }
959 x = NULL;
960 nc += l + 3;
961 p = q;
962 }
963
964 i = ssl_verify_cert_chain(s, sk);
965 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
966 #ifndef OPENSSL_NO_KRB5
967 && (s->s3->tmp.
968 new_cipher->algorithms & (SSL_MKEY_MASK | SSL_AUTH_MASK))
969 != (SSL_aKRB5 | SSL_kKRB5)
970 #endif /* OPENSSL_NO_KRB5 */
971 ) {
972 al = ssl_verify_alarm_type(s->verify_result);
973 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
974 SSL_R_CERTIFICATE_VERIFY_FAILED);
975 goto f_err;
976 }
977 ERR_clear_error(); /* but we keep s->verify_result */
978
979 sc = ssl_sess_cert_new();
980 if (sc == NULL)
981 goto err;
982
983 if (s->session->sess_cert)
984 ssl_sess_cert_free(s->session->sess_cert);
985 s->session->sess_cert = sc;
986
987 sc->cert_chain = sk;
988 /*
989 * Inconsistency alert: cert_chain does include the peer's certificate,
990 * which we don't include in s3_srvr.c
991 */
992 x = sk_X509_value(sk, 0);
993 sk = NULL;
994 /*
995 * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end
996 */
997
998 pkey = X509_get_pubkey(x);
999
1000 /* VRS: allow null cert if auth == KRB5 */
1001 need_cert = ((s->s3->tmp.new_cipher->algorithms
1002 & (SSL_MKEY_MASK | SSL_AUTH_MASK))
1003 == (SSL_aKRB5 | SSL_kKRB5)) ? 0 : 1;
1004
1005 #ifdef KSSL_DEBUG
1006 printf("pkey,x = %p, %p\n", (void *)pkey, (void *)x);
1007 printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x, pkey));
1008 printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
1009 s->s3->tmp.new_cipher->algorithms, need_cert);
1010 #endif /* KSSL_DEBUG */
1011
1012 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))) {
1013 x = NULL;
1014 al = SSL3_AL_FATAL;
1015 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1016 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1017 goto f_err;
1018 }
1019
1020 i = ssl_cert_type(x, pkey);
1021 if (need_cert && i < 0) {
1022 x = NULL;
1023 al = SSL3_AL_FATAL;
1024 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1025 SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1026 goto f_err;
1027 }
1028
1029 if (need_cert) {
1030 sc->peer_cert_type = i;
1031 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1032 /*
1033 * Why would the following ever happen? We just created sc a couple
1034 * of lines ago.
1035 */
1036 if (sc->peer_pkeys[i].x509 != NULL)
1037 X509_free(sc->peer_pkeys[i].x509);
1038 sc->peer_pkeys[i].x509 = x;
1039 sc->peer_key = &(sc->peer_pkeys[i]);
1040
1041 if (s->session->peer != NULL)
1042 X509_free(s->session->peer);
1043 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1044 s->session->peer = x;
1045 } else {
1046 sc->peer_cert_type = i;
1047 sc->peer_key = NULL;
1048
1049 if (s->session->peer != NULL)
1050 X509_free(s->session->peer);
1051 s->session->peer = NULL;
1052 }
1053 s->session->verify_result = s->verify_result;
1054
1055 x = NULL;
1056 ret = 1;
1057
1058 if (0) {
1059 f_err:
1060 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1061 }
1062 err:
1063 EVP_PKEY_free(pkey);
1064 X509_free(x);
1065 sk_X509_pop_free(sk, X509_free);
1066 return (ret);
1067 }
1068
1069 int ssl3_get_key_exchange(SSL *s)
1070 {
1071 #ifndef OPENSSL_NO_RSA
1072 unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2];
1073 #endif
1074 EVP_MD_CTX md_ctx;
1075 unsigned char *param, *p;
1076 int al, j, ok;
1077 long i, param_len, n, alg;
1078 EVP_PKEY *pkey = NULL;
1079 #ifndef OPENSSL_NO_RSA
1080 RSA *rsa = NULL;
1081 #endif
1082 #ifndef OPENSSL_NO_DH
1083 DH *dh = NULL;
1084 #endif
1085 #ifndef OPENSSL_NO_ECDH
1086 EC_KEY *ecdh = NULL;
1087 BN_CTX *bn_ctx = NULL;
1088 EC_POINT *srvr_ecpoint = NULL;
1089 int curve_nid = 0;
1090 int encoded_pt_len = 0;
1091 #endif
1092
1093 /*
1094 * use same message size as in ssl3_get_certificate_request() as
1095 * ServerKeyExchange message may be skipped
1096 */
1097 n = s->method->ssl_get_message(s,
1098 SSL3_ST_CR_KEY_EXCH_A,
1099 SSL3_ST_CR_KEY_EXCH_B,
1100 -1, s->max_cert_list, &ok);
1101
1102 if (!ok)
1103 return ((int)n);
1104
1105 alg = s->s3->tmp.new_cipher->algorithms;
1106 EVP_MD_CTX_init(&md_ctx);
1107
1108 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) {
1109 /*
1110 * Can't skip server key exchange if this is an ephemeral
1111 * ciphersuite.
1112 */
1113 if (alg & (SSL_kEDH | SSL_kECDHE)) {
1114 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1115 al = SSL_AD_UNEXPECTED_MESSAGE;
1116 goto f_err;
1117 }
1118 s->s3->tmp.reuse_message = 1;
1119 return (1);
1120 }
1121
1122 param = p = (unsigned char *)s->init_msg;
1123
1124 if (s->session->sess_cert != NULL) {
1125 #ifndef OPENSSL_NO_RSA
1126 if (s->session->sess_cert->peer_rsa_tmp != NULL) {
1127 RSA_free(s->session->sess_cert->peer_rsa_tmp);
1128 s->session->sess_cert->peer_rsa_tmp = NULL;
1129 }
1130 #endif
1131 #ifndef OPENSSL_NO_DH
1132 if (s->session->sess_cert->peer_dh_tmp) {
1133 DH_free(s->session->sess_cert->peer_dh_tmp);
1134 s->session->sess_cert->peer_dh_tmp = NULL;
1135 }
1136 #endif
1137 #ifndef OPENSSL_NO_ECDH
1138 if (s->session->sess_cert->peer_ecdh_tmp) {
1139 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1140 s->session->sess_cert->peer_ecdh_tmp = NULL;
1141 }
1142 #endif
1143 } else {
1144 s->session->sess_cert = ssl_sess_cert_new();
1145 }
1146
1147 /* Total length of the parameters including the length prefix */
1148 param_len = 0;
1149
1150 al = SSL_AD_DECODE_ERROR;
1151 #ifndef OPENSSL_NO_RSA
1152 if (alg & SSL_kRSA) {
1153 /* Temporary RSA keys only allowed in export ciphersuites */
1154 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) {
1155 al = SSL_AD_UNEXPECTED_MESSAGE;
1156 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1157 goto f_err;
1158 }
1159 if ((rsa = RSA_new()) == NULL) {
1160 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1161 goto err;
1162 }
1163
1164 param_len = 2;
1165 if (param_len > n) {
1166 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1167 goto f_err;
1168 }
1169 n2s(p, i);
1170
1171 if (i > n - param_len) {
1172 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH);
1173 goto f_err;
1174 }
1175 param_len += i;
1176
1177 if (!(rsa->n = BN_bin2bn(p, i, rsa->n))) {
1178 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1179 goto err;
1180 }
1181 p += i;
1182
1183 if (2 > n - param_len) {
1184 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1185 goto f_err;
1186 }
1187 param_len += 2;
1188
1189 n2s(p, i);
1190
1191 if (i > n - param_len) {
1192 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH);
1193 goto f_err;
1194 }
1195 param_len += i;
1196
1197 if (!(rsa->e = BN_bin2bn(p, i, rsa->e))) {
1198 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1199 goto err;
1200 }
1201 p += i;
1202 n -= param_len;
1203
1204 /* this should be because we are using an export cipher */
1205 if (alg & SSL_aRSA)
1206 pkey =
1207 X509_get_pubkey(s->session->
1208 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1209 else {
1210 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1211 goto err;
1212 }
1213 s->session->sess_cert->peer_rsa_tmp = rsa;
1214 rsa = NULL;
1215 }
1216 #else /* OPENSSL_NO_RSA */
1217 if (0) ;
1218 #endif
1219 #ifndef OPENSSL_NO_DH
1220 else if (alg & SSL_kEDH) {
1221 if ((dh = DH_new()) == NULL) {
1222 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB);
1223 goto err;
1224 }
1225
1226 param_len = 2;
1227 if (param_len > n) {
1228 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1229 goto f_err;
1230 }
1231 n2s(p, i);
1232
1233 if (i > n - param_len) {
1234 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH);
1235 goto f_err;
1236 }
1237 param_len += i;
1238
1239 if (!(dh->p = BN_bin2bn(p, i, NULL))) {
1240 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1241 goto err;
1242 }
1243 p += i;
1244
1245 if (2 > n - param_len) {
1246 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1247 goto f_err;
1248 }
1249 param_len += 2;
1250
1251 n2s(p, i);
1252
1253 if (i > n - param_len) {
1254 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH);
1255 goto f_err;
1256 }
1257 param_len += i;
1258
1259 if (!(dh->g = BN_bin2bn(p, i, NULL))) {
1260 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1261 goto err;
1262 }
1263 p += i;
1264
1265 if (2 > n - param_len) {
1266 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1267 goto f_err;
1268 }
1269 param_len += 2;
1270
1271 n2s(p, i);
1272
1273 if (i > n - param_len) {
1274 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH);
1275 goto f_err;
1276 }
1277 param_len += i;
1278
1279 if (!(dh->pub_key = BN_bin2bn(p, i, NULL))) {
1280 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB);
1281 goto err;
1282 }
1283 p += i;
1284 n -= param_len;
1285
1286 # ifndef OPENSSL_NO_RSA
1287 if (alg & SSL_aRSA)
1288 pkey =
1289 X509_get_pubkey(s->session->
1290 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1291 # else
1292 if (0) ;
1293 # endif
1294 # ifndef OPENSSL_NO_DSA
1295 else if (alg & SSL_aDSS)
1296 pkey =
1297 X509_get_pubkey(s->session->
1298 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].
1299 x509);
1300 # endif
1301 /* else anonymous DH, so no certificate or pkey. */
1302
1303 s->session->sess_cert->peer_dh_tmp = dh;
1304 dh = NULL;
1305 } else if ((alg & SSL_kDHr) || (alg & SSL_kDHd)) {
1306 al = SSL_AD_ILLEGAL_PARAMETER;
1307 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1308 SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1309 goto f_err;
1310 }
1311 #endif /* !OPENSSL_NO_DH */
1312
1313 #ifndef OPENSSL_NO_ECDH
1314 else if (alg & SSL_kECDHE) {
1315 EC_GROUP *ngroup;
1316 const EC_GROUP *group;
1317
1318 if ((ecdh = EC_KEY_new()) == NULL) {
1319 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1320 goto err;
1321 }
1322
1323 /*
1324 * Extract elliptic curve parameters and the server's ephemeral ECDH
1325 * public key. Keep accumulating lengths of various components in
1326 * param_len and make sure it never exceeds n.
1327 */
1328
1329 /*
1330 * XXX: For now we only support named (not generic) curves and the
1331 * ECParameters in this case is just three bytes. We also need one
1332 * byte for the length of the encoded point
1333 */
1334 param_len = 4;
1335 if (param_len > n) {
1336 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
1337 goto f_err;
1338 }
1339
1340 if ((*p != NAMED_CURVE_TYPE) ||
1341 ((curve_nid = curve_id2nid(*(p + 2))) == 0)) {
1342 al = SSL_AD_INTERNAL_ERROR;
1343 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1344 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1345 goto f_err;
1346 }
1347
1348 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1349 if (ngroup == NULL) {
1350 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1351 goto err;
1352 }
1353 if (EC_KEY_set_group(ecdh, ngroup) == 0) {
1354 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB);
1355 goto err;
1356 }
1357 EC_GROUP_free(ngroup);
1358
1359 group = EC_KEY_get0_group(ecdh);
1360
1361 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1362 (EC_GROUP_get_degree(group) > 163)) {
1363 al = SSL_AD_EXPORT_RESTRICTION;
1364 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1365 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1366 goto f_err;
1367 }
1368
1369 p += 3;
1370
1371 /* Next, get the encoded ECPoint */
1372 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1373 ((bn_ctx = BN_CTX_new()) == NULL)) {
1374 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1375 goto err;
1376 }
1377
1378 encoded_pt_len = *p; /* length of encoded point */
1379 p += 1;
1380
1381 if ((encoded_pt_len > n - param_len) ||
1382 (EC_POINT_oct2point(group, srvr_ecpoint,
1383 p, encoded_pt_len, bn_ctx) == 0)) {
1384 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT);
1385 goto f_err;
1386 }
1387 param_len += encoded_pt_len;
1388
1389 n -= param_len;
1390 p += encoded_pt_len;
1391
1392 /*
1393 * The ECC/TLS specification does not mention the use of DSA to sign
1394 * ECParameters in the server key exchange message. We do support RSA
1395 * and ECDSA.
1396 */
1397 if (0) ;
1398 # ifndef OPENSSL_NO_RSA
1399 else if (alg & SSL_aRSA)
1400 pkey =
1401 X509_get_pubkey(s->session->
1402 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1403 # endif
1404 # ifndef OPENSSL_NO_ECDSA
1405 else if (alg & SSL_aECDSA)
1406 pkey =
1407 X509_get_pubkey(s->session->
1408 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1409 # endif
1410 /* else anonymous ECDH, so no certificate or pkey. */
1411 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1412 s->session->sess_cert->peer_ecdh_tmp = ecdh;
1413 ecdh = NULL;
1414 BN_CTX_free(bn_ctx);
1415 bn_ctx = NULL;
1416 EC_POINT_free(srvr_ecpoint);
1417 srvr_ecpoint = NULL;
1418 } else if (alg & SSL_kECDH) {
1419 al = SSL_AD_UNEXPECTED_MESSAGE;
1420 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1421 goto f_err;
1422 }
1423 #endif /* !OPENSSL_NO_ECDH */
1424 if (alg & SSL_aFZA) {
1425 al = SSL_AD_HANDSHAKE_FAILURE;
1426 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1427 SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1428 goto f_err;
1429 }
1430
1431 /* p points to the next byte, there are 'n' bytes left */
1432
1433 /* if it was signed, check the signature */
1434 if (pkey != NULL) {
1435 n2s(p, i);
1436 n -= 2;
1437 j = EVP_PKEY_size(pkey);
1438
1439 /*
1440 * Check signature length. If n is 0 then signature is empty
1441 */
1442 if ((i != n) || (n > j) || (n <= 0)) {
1443 /* wrong packet length */
1444 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH);
1445 goto f_err;
1446 }
1447 #ifndef OPENSSL_NO_RSA
1448 if (pkey->type == EVP_PKEY_RSA) {
1449 int num;
1450 unsigned int size;
1451
1452 j = 0;
1453 q = md_buf;
1454 for (num = 2; num > 0; num--) {
1455 EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1456 EVP_DigestInit_ex(&md_ctx, (num == 2)
1457 ? s->ctx->md5 : s->ctx->sha1, NULL);
1458 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]),
1459 SSL3_RANDOM_SIZE);
1460 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]),
1461 SSL3_RANDOM_SIZE);
1462 EVP_DigestUpdate(&md_ctx, param, param_len);
1463 EVP_DigestFinal_ex(&md_ctx, q, &size);
1464 q += size;
1465 j += size;
1466 }
1467 i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa);
1468 if (i < 0) {
1469 al = SSL_AD_DECRYPT_ERROR;
1470 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT);
1471 goto f_err;
1472 }
1473 if (i == 0) {
1474 /* bad signature */
1475 al = SSL_AD_DECRYPT_ERROR;
1476 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1477 goto f_err;
1478 }
1479 } else
1480 #endif
1481 #ifndef OPENSSL_NO_DSA
1482 if (pkey->type == EVP_PKEY_DSA) {
1483 /* lets do DSS */
1484 EVP_VerifyInit_ex(&md_ctx, EVP_dss1(), NULL);
1485 EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
1486 SSL3_RANDOM_SIZE);
1487 EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
1488 SSL3_RANDOM_SIZE);
1489 EVP_VerifyUpdate(&md_ctx, param, param_len);
1490 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
1491 /* bad signature */
1492 al = SSL_AD_DECRYPT_ERROR;
1493 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1494 goto f_err;
1495 }
1496 } else
1497 #endif
1498 #ifndef OPENSSL_NO_ECDSA
1499 if (pkey->type == EVP_PKEY_EC) {
1500 /* let's do ECDSA */
1501 EVP_VerifyInit_ex(&md_ctx, EVP_ecdsa(), NULL);
1502 EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]),
1503 SSL3_RANDOM_SIZE);
1504 EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]),
1505 SSL3_RANDOM_SIZE);
1506 EVP_VerifyUpdate(&md_ctx, param, param_len);
1507 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) {
1508 /* bad signature */
1509 al = SSL_AD_DECRYPT_ERROR;
1510 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
1511 goto f_err;
1512 }
1513 } else
1514 #endif
1515 {
1516 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1517 goto err;
1518 }
1519 } else {
1520 /* still data left over */
1521 if (!(alg & SSL_aNULL)) {
1522 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1523 goto err;
1524 }
1525 if (n != 0) {
1526 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
1527 goto f_err;
1528 }
1529 }
1530 EVP_PKEY_free(pkey);
1531 EVP_MD_CTX_cleanup(&md_ctx);
1532 return (1);
1533 f_err:
1534 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1535 err:
1536 EVP_PKEY_free(pkey);
1537 #ifndef OPENSSL_NO_RSA
1538 if (rsa != NULL)
1539 RSA_free(rsa);
1540 #endif
1541 #ifndef OPENSSL_NO_DH
1542 if (dh != NULL)
1543 DH_free(dh);
1544 #endif
1545 #ifndef OPENSSL_NO_ECDH
1546 BN_CTX_free(bn_ctx);
1547 EC_POINT_free(srvr_ecpoint);
1548 if (ecdh != NULL)
1549 EC_KEY_free(ecdh);
1550 #endif
1551 EVP_MD_CTX_cleanup(&md_ctx);
1552 return (-1);
1553 }
1554
1555 int ssl3_get_certificate_request(SSL *s)
1556 {
1557 int ok, ret = 0;
1558 unsigned long n, nc, l;
1559 unsigned int llen, ctype_num, i;
1560 X509_NAME *xn = NULL;
1561 const unsigned char *p, *q;
1562 unsigned char *d;
1563 STACK_OF(X509_NAME) *ca_sk = NULL;
1564
1565 n = s->method->ssl_get_message(s,
1566 SSL3_ST_CR_CERT_REQ_A,
1567 SSL3_ST_CR_CERT_REQ_B,
1568 -1, s->max_cert_list, &ok);
1569
1570 if (!ok)
1571 return ((int)n);
1572
1573 s->s3->tmp.cert_req = 0;
1574
1575 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) {
1576 s->s3->tmp.reuse_message = 1;
1577 return (1);
1578 }
1579
1580 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) {
1581 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1582 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE);
1583 goto err;
1584 }
1585
1586 /* TLS does not like anon-DH with client cert */
1587 if (s->version > SSL3_VERSION) {
1588 l = s->s3->tmp.new_cipher->algorithms;
1589 if (l & SSL_aNULL) {
1590 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
1591 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1592 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1593 goto err;
1594 }
1595 }
1596
1597 p = d = (unsigned char *)s->init_msg;
1598
1599 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
1600 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
1601 goto err;
1602 }
1603
1604 /* get the certificate types */
1605 ctype_num = *(p++);
1606 if (ctype_num > SSL3_CT_NUMBER)
1607 ctype_num = SSL3_CT_NUMBER;
1608 for (i = 0; i < ctype_num; i++)
1609 s->s3->tmp.ctype[i] = p[i];
1610 p += ctype_num;
1611
1612 /* get the CA RDNs */
1613 n2s(p, llen);
1614 #if 0
1615 {
1616 FILE *out;
1617 out = fopen("/tmp/vsign.der", "w");
1618 fwrite(p, 1, llen, out);
1619 fclose(out);
1620 }
1621 #endif
1622
1623 if ((llen + ctype_num + 2 + 1) != n) {
1624 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1625 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
1626 goto err;
1627 }
1628
1629 for (nc = 0; nc < llen;) {
1630 n2s(p, l);
1631 if ((l + nc + 2) > llen) {
1632 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1633 goto cont; /* netscape bugs */
1634 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1635 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG);
1636 goto err;
1637 }
1638
1639 q = p;
1640
1641 if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) {
1642 /* If netscape tolerance is on, ignore errors */
1643 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1644 goto cont;
1645 else {
1646 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1647 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
1648 goto err;
1649 }
1650 }
1651
1652 if (q != (p + l)) {
1653 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1654 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,
1655 SSL_R_CA_DN_LENGTH_MISMATCH);
1656 goto err;
1657 }
1658 if (!sk_X509_NAME_push(ca_sk, xn)) {
1659 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
1660 goto err;
1661 }
1662
1663 p += l;
1664 nc += l + 2;
1665 }
1666
1667 if (0) {
1668 cont:
1669 ERR_clear_error();
1670 }
1671
1672 /* we should setup a certificate to return.... */
1673 s->s3->tmp.cert_req = 1;
1674 s->s3->tmp.ctype_num = ctype_num;
1675 if (s->s3->tmp.ca_names != NULL)
1676 sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
1677 s->s3->tmp.ca_names = ca_sk;
1678 ca_sk = NULL;
1679
1680 ret = 1;
1681 err:
1682 if (ca_sk != NULL)
1683 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
1684 return (ret);
1685 }
1686
1687 static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
1688 {
1689 return (X509_NAME_cmp(*a, *b));
1690 }
1691
1692 #ifndef OPENSSL_NO_TLSEXT
1693 int ssl3_get_new_session_ticket(SSL *s)
1694 {
1695 int ok, al, ret = 0, ticklen;
1696 long n;
1697 const unsigned char *p;
1698 unsigned char *d;
1699
1700 n = s->method->ssl_get_message(s,
1701 SSL3_ST_CR_SESSION_TICKET_A,
1702 SSL3_ST_CR_SESSION_TICKET_B,
1703 -1, 16384, &ok);
1704
1705 if (!ok)
1706 return ((int)n);
1707
1708 if (s->s3->tmp.message_type == SSL3_MT_FINISHED) {
1709 s->s3->tmp.reuse_message = 1;
1710 return (1);
1711 }
1712 if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) {
1713 al = SSL_AD_UNEXPECTED_MESSAGE;
1714 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_BAD_MESSAGE_TYPE);
1715 goto f_err;
1716 }
1717 if (n < 6) {
1718 /* need at least ticket_lifetime_hint + ticket length */
1719 al = SSL_AD_DECODE_ERROR;
1720 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
1721 goto f_err;
1722 }
1723
1724 p = d = (unsigned char *)s->init_msg;
1725
1726 if (s->session->session_id_length > 0) {
1727 int i = s->session_ctx->session_cache_mode;
1728 SSL_SESSION *new_sess;
1729 /*
1730 * We reused an existing session, so we need to replace it with a new
1731 * one
1732 */
1733 if (i & SSL_SESS_CACHE_CLIENT) {
1734 /*
1735 * Remove the old session from the cache
1736 */
1737 if (i & SSL_SESS_CACHE_NO_INTERNAL_STORE) {
1738 if (s->session_ctx->remove_session_cb != NULL)
1739 s->session_ctx->remove_session_cb(s->session_ctx,
1740 s->session);
1741 } else {
1742 /* We carry on if this fails */
1743 SSL_CTX_remove_session(s->session_ctx, s->session);
1744 }
1745 }
1746
1747 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) {
1748 al = SSL_AD_INTERNAL_ERROR;
1749 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
1750 goto f_err;
1751 }
1752
1753 SSL_SESSION_free(s->session);
1754 s->session = new_sess;
1755 }
1756
1757 n2l(p, s->session->tlsext_tick_lifetime_hint);
1758 n2s(p, ticklen);
1759 /* ticket_lifetime_hint + ticket_length + ticket */
1760 if (ticklen + 6 != n) {
1761 al = SSL_AD_DECODE_ERROR;
1762 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
1763 goto f_err;
1764 }
1765 if (s->session->tlsext_tick) {
1766 OPENSSL_free(s->session->tlsext_tick);
1767 s->session->tlsext_ticklen = 0;
1768 }
1769 s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1770 if (!s->session->tlsext_tick) {
1771 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
1772 goto err;
1773 }
1774 memcpy(s->session->tlsext_tick, p, ticklen);
1775 s->session->tlsext_ticklen = ticklen;
1776 /*
1777 * There are two ways to detect a resumed ticket sesion. One is to set an
1778 * appropriate session ID and then the server must return a match in
1779 * ServerHello. This allows the normal client session ID matching to work
1780 * and we know much earlier that the ticket has been accepted. The
1781 * other way is to set zero length session ID when the ticket is
1782 * presented and rely on the handshake to determine session resumption.
1783 * We choose the former approach because this fits in with assumptions
1784 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is
1785 * SHA256 is disabled) hash of the ticket.
1786 */
1787 EVP_Digest(p, ticklen,
1788 s->session->session_id, &s->session->session_id_length,
1789 # ifndef OPENSSL_NO_SHA256
1790 EVP_sha256(), NULL);
1791 # else
1792 EVP_sha1(), NULL);
1793 # endif
1794 ret = 1;
1795 return (ret);
1796 f_err:
1797 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1798 err:
1799 return (-1);
1800 }
1801
1802 int ssl3_get_cert_status(SSL *s)
1803 {
1804 int ok, al;
1805 unsigned long resplen;
1806 long n;
1807 const unsigned char *p;
1808
1809 n = s->method->ssl_get_message(s,
1810 SSL3_ST_CR_CERT_STATUS_A,
1811 SSL3_ST_CR_CERT_STATUS_B,
1812 SSL3_MT_CERTIFICATE_STATUS, 16384, &ok);
1813
1814 if (!ok)
1815 return ((int)n);
1816 if (n < 4) {
1817 /* need at least status type + length */
1818 al = SSL_AD_DECODE_ERROR;
1819 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
1820 goto f_err;
1821 }
1822 p = (unsigned char *)s->init_msg;
1823 if (*p++ != TLSEXT_STATUSTYPE_ocsp) {
1824 al = SSL_AD_DECODE_ERROR;
1825 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE);
1826 goto f_err;
1827 }
1828 n2l3(p, resplen);
1829 if (resplen + 4 != (unsigned long)n) {
1830 al = SSL_AD_DECODE_ERROR;
1831 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
1832 goto f_err;
1833 }
1834 if (s->tlsext_ocsp_resp)
1835 OPENSSL_free(s->tlsext_ocsp_resp);
1836 s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1837 if (!s->tlsext_ocsp_resp) {
1838 al = SSL_AD_INTERNAL_ERROR;
1839 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
1840 goto f_err;
1841 }
1842 s->tlsext_ocsp_resplen = resplen;
1843 if (s->ctx->tlsext_status_cb) {
1844 int ret;
1845 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1846 if (ret == 0) {
1847 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1848 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE);
1849 goto f_err;
1850 }
1851 if (ret < 0) {
1852 al = SSL_AD_INTERNAL_ERROR;
1853 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE);
1854 goto f_err;
1855 }
1856 }
1857 return 1;
1858 f_err:
1859 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1860 return (-1);
1861 }
1862 #endif
1863
1864 int ssl3_get_server_done(SSL *s)
1865 {
1866 int ok, ret = 0;
1867 long n;
1868
1869 /* Second to last param should be very small, like 0 :-) */
1870 n = s->method->ssl_get_message(s,
1871 SSL3_ST_CR_SRVR_DONE_A,
1872 SSL3_ST_CR_SRVR_DONE_B,
1873 SSL3_MT_SERVER_DONE, 30, &ok);
1874
1875 if (!ok)
1876 return ((int)n);
1877 if (n > 0) {
1878 /* should contain no data */
1879 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
1880 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
1881 return -1;
1882 }
1883 ret = 1;
1884 return (ret);
1885 }
1886
1887 int ssl3_send_client_key_exchange(SSL *s)
1888 {
1889 unsigned char *p, *d;
1890 int n;
1891 unsigned long l;
1892 #ifndef OPENSSL_NO_RSA
1893 unsigned char *q;
1894 EVP_PKEY *pkey = NULL;
1895 #endif
1896 #ifndef OPENSSL_NO_KRB5
1897 KSSL_ERR kssl_err;
1898 #endif /* OPENSSL_NO_KRB5 */
1899 #ifndef OPENSSL_NO_ECDH
1900 EC_KEY *clnt_ecdh = NULL;
1901 const EC_POINT *srvr_ecpoint = NULL;
1902 EVP_PKEY *srvr_pub_pkey = NULL;
1903 unsigned char *encodedPoint = NULL;
1904 int encoded_pt_len = 0;
1905 BN_CTX *bn_ctx = NULL;
1906 #endif
1907
1908 if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
1909 d = (unsigned char *)s->init_buf->data;
1910 p = &(d[4]);
1911
1912 l = s->s3->tmp.new_cipher->algorithms;
1913
1914 /* Fool emacs indentation */
1915 if (0) {
1916 }
1917 #ifndef OPENSSL_NO_RSA
1918 else if (l & SSL_kRSA) {
1919 RSA *rsa;
1920 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1921
1922 if (s->session->sess_cert == NULL) {
1923 /*
1924 * We should always have a server certificate with SSL_kRSA.
1925 */
1926 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1927 ERR_R_INTERNAL_ERROR);
1928 goto err;
1929 }
1930
1931 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1932 rsa = s->session->sess_cert->peer_rsa_tmp;
1933 else {
1934 pkey =
1935 X509_get_pubkey(s->session->
1936 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
1937 x509);
1938 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
1939 || (pkey->pkey.rsa == NULL)) {
1940 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1941 ERR_R_INTERNAL_ERROR);
1942 goto err;
1943 }
1944 rsa = pkey->pkey.rsa;
1945 EVP_PKEY_free(pkey);
1946 }
1947
1948 tmp_buf[0] = s->client_version >> 8;
1949 tmp_buf[1] = s->client_version & 0xff;
1950 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
1951 goto err;
1952
1953 s->session->master_key_length = sizeof tmp_buf;
1954
1955 q = p;
1956 /* Fix buf for TLS and beyond */
1957 if (s->version > SSL3_VERSION)
1958 p += 2;
1959 n = RSA_public_encrypt(sizeof tmp_buf,
1960 tmp_buf, p, rsa, RSA_PKCS1_PADDING);
1961 # ifdef PKCS1_CHECK
1962 if (s->options & SSL_OP_PKCS1_CHECK_1)
1963 p[1]++;
1964 if (s->options & SSL_OP_PKCS1_CHECK_2)
1965 tmp_buf[0] = 0x70;
1966 # endif
1967 if (n <= 0) {
1968 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1969 SSL_R_BAD_RSA_ENCRYPT);
1970 goto err;
1971 }
1972
1973 /* Fix buf for TLS and beyond */
1974 if (s->version > SSL3_VERSION) {
1975 s2n(n, q);
1976 n += 2;
1977 }
1978
1979 s->session->master_key_length =
1980 s->method->ssl3_enc->generate_master_secret(s,
1981 s->
1982 session->master_key,
1983 tmp_buf,
1984 sizeof tmp_buf);
1985 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1986 }
1987 #endif
1988 #ifndef OPENSSL_NO_KRB5
1989 else if (l & SSL_kKRB5) {
1990 krb5_error_code krb5rc;
1991 KSSL_CTX *kssl_ctx = s->kssl_ctx;
1992 /* krb5_data krb5_ap_req; */
1993 krb5_data *enc_ticket;
1994 krb5_data authenticator, *authp = NULL;
1995 EVP_CIPHER_CTX ciph_ctx;
1996 EVP_CIPHER *enc = NULL;
1997 unsigned char iv[EVP_MAX_IV_LENGTH];
1998 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1999 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH];
2000 int padl, outl = sizeof(epms);
2001
2002 EVP_CIPHER_CTX_init(&ciph_ctx);
2003
2004 # ifdef KSSL_DEBUG
2005 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2006 l, SSL_kKRB5);
2007 # endif /* KSSL_DEBUG */
2008
2009 authp = NULL;
2010 # ifdef KRB5SENDAUTH
2011 if (KRB5SENDAUTH)
2012 authp = &authenticator;
2013 # endif /* KRB5SENDAUTH */
2014
2015 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err);
2016 enc = kssl_map_enc(kssl_ctx->enctype);
2017 if (enc == NULL)
2018 goto err;
2019 # ifdef KSSL_DEBUG
2020 {
2021 printf("kssl_cget_tkt rtn %d\n", krb5rc);
2022 if (krb5rc && kssl_err.text)
2023 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2024 }
2025 # endif /* KSSL_DEBUG */
2026
2027 if (krb5rc) {
2028 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2029 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
2030 goto err;
2031 }
2032
2033 /*-
2034 * 20010406 VRS - Earlier versions used KRB5 AP_REQ
2035 * in place of RFC 2712 KerberosWrapper, as in:
2036 *
2037 * Send ticket (copy to *p, set n = length)
2038 * n = krb5_ap_req.length;
2039 * memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2040 * if (krb5_ap_req.data)
2041 * kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2042 *
2043 * Now using real RFC 2712 KerberosWrapper
2044 * (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2045 * Note: 2712 "opaque" types are here replaced
2046 * with a 2-byte length followed by the value.
2047 * Example:
2048 * KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2049 * Where "xx xx" = length bytes. Shown here with
2050 * optional authenticator omitted.
2051 */
2052
2053 /* KerberosWrapper.Ticket */
2054 s2n(enc_ticket->length, p);
2055 memcpy(p, enc_ticket->data, enc_ticket->length);
2056 p += enc_ticket->length;
2057 n = enc_ticket->length + 2;
2058
2059 /* KerberosWrapper.Authenticator */
2060 if (authp && authp->length) {
2061 s2n(authp->length, p);
2062 memcpy(p, authp->data, authp->length);
2063 p += authp->length;
2064 n += authp->length + 2;
2065
2066 free(authp->data);
2067 authp->data = NULL;
2068 authp->length = 0;
2069 } else {
2070 s2n(0, p); /* null authenticator length */
2071 n += 2;
2072 }
2073
2074 tmp_buf[0] = s->client_version >> 8;
2075 tmp_buf[1] = s->client_version & 0xff;
2076 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
2077 goto err;
2078
2079 /*-
2080 * 20010420 VRS. Tried it this way; failed.
2081 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2082 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2083 * kssl_ctx->length);
2084 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2085 */
2086
2087 memset(iv, 0, sizeof iv); /* per RFC 1510 */
2088 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
2089 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf,
2090 sizeof tmp_buf);
2091 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
2092 outl += padl;
2093 if (outl > sizeof epms) {
2094 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2095 ERR_R_INTERNAL_ERROR);
2096 goto err;
2097 }
2098 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2099
2100 /* KerberosWrapper.EncryptedPreMasterSecret */
2101 s2n(outl, p);
2102 memcpy(p, epms, outl);
2103 p += outl;
2104 n += outl + 2;
2105
2106 s->session->master_key_length =
2107 s->method->ssl3_enc->generate_master_secret(s,
2108 s->
2109 session->master_key,
2110 tmp_buf,
2111 sizeof tmp_buf);
2112
2113 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2114 OPENSSL_cleanse(epms, outl);
2115 }
2116 #endif
2117 #ifndef OPENSSL_NO_DH
2118 else if (l & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
2119 DH *dh_srvr, *dh_clnt;
2120
2121 if (s->session->sess_cert == NULL) {
2122 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2123 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2124 SSL_R_UNEXPECTED_MESSAGE);
2125 goto err;
2126 }
2127
2128 if (s->session->sess_cert->peer_dh_tmp != NULL)
2129 dh_srvr = s->session->sess_cert->peer_dh_tmp;
2130 else {
2131 /* we get them from the cert */
2132 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2133 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2134 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2135 goto err;
2136 }
2137
2138 /* generate a new random key */
2139 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
2140 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2141 goto err;
2142 }
2143 if (!DH_generate_key(dh_clnt)) {
2144 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2145 goto err;
2146 }
2147
2148 /*
2149 * use the 'p' output buffer for the DH key, but make sure to
2150 * clear it out afterwards
2151 */
2152
2153 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt);
2154
2155 if (n <= 0) {
2156 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
2157 goto err;
2158 }
2159
2160 /* generate master key from the result */
2161 s->session->master_key_length =
2162 s->method->ssl3_enc->generate_master_secret(s,
2163 s->
2164 session->master_key,
2165 p, n);
2166 /* clean up */
2167 memset(p, 0, n);
2168
2169 /* send off the data */
2170 n = BN_num_bytes(dh_clnt->pub_key);
2171 s2n(n, p);
2172 BN_bn2bin(dh_clnt->pub_key, p);
2173 n += 2;
2174
2175 DH_free(dh_clnt);
2176
2177 /* perhaps clean things up a bit EAY EAY EAY EAY */
2178 }
2179 #endif
2180
2181 #ifndef OPENSSL_NO_ECDH
2182 else if ((l & SSL_kECDH) || (l & SSL_kECDHE)) {
2183 const EC_GROUP *srvr_group = NULL;
2184 EC_KEY *tkey;
2185 int ecdh_clnt_cert = 0;
2186 int field_size = 0;
2187
2188 if (s->session->sess_cert == NULL) {
2189 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
2190 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2191 SSL_R_UNEXPECTED_MESSAGE);
2192 goto err;
2193 }
2194
2195 /*
2196 * Did we send out the client's ECDH share for use in premaster
2197 * computation as part of client certificate? If so, set
2198 * ecdh_clnt_cert to 1.
2199 */
2200 if ((l & SSL_kECDH) && (s->cert != NULL)) {
2201 /*-
2202 * XXX: For now, we do not support client
2203 * authentication using ECDH certificates.
2204 * To add such support, one needs to add
2205 * code that checks for appropriate
2206 * conditions and sets ecdh_clnt_cert to 1.
2207 * For example, the cert have an ECC
2208 * key on the same curve as the server's
2209 * and the key should be authorized for
2210 * key agreement.
2211 *
2212 * One also needs to add code in ssl3_connect
2213 * to skip sending the certificate verify
2214 * message.
2215 *
2216 * if ((s->cert->key->privatekey != NULL) &&
2217 * (s->cert->key->privatekey->type ==
2218 * EVP_PKEY_EC) && ...)
2219 * ecdh_clnt_cert = 1;
2220 */
2221 }
2222
2223 if (s->session->sess_cert->peer_ecdh_tmp != NULL) {
2224 tkey = s->session->sess_cert->peer_ecdh_tmp;
2225 } else {
2226 /* Get the Server Public Key from Cert */
2227 srvr_pub_pkey =
2228 X509_get_pubkey(s->session->
2229 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2230 if ((srvr_pub_pkey == NULL)
2231 || (srvr_pub_pkey->type != EVP_PKEY_EC)
2232 || (srvr_pub_pkey->pkey.ec == NULL)) {
2233 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2234 ERR_R_INTERNAL_ERROR);
2235 goto err;
2236 }
2237
2238 tkey = srvr_pub_pkey->pkey.ec;
2239 }
2240
2241 srvr_group = EC_KEY_get0_group(tkey);
2242 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2243
2244 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) {
2245 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2246 ERR_R_INTERNAL_ERROR);
2247 goto err;
2248 }
2249
2250 if ((clnt_ecdh = EC_KEY_new()) == NULL) {
2251 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2252 ERR_R_MALLOC_FAILURE);
2253 goto err;
2254 }
2255
2256 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) {
2257 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2258 goto err;
2259 }
2260 if (ecdh_clnt_cert) {
2261 /*
2262 * Reuse key info from our certificate We only need our
2263 * private key to perform the ECDH computation.
2264 */
2265 const BIGNUM *priv_key;
2266 tkey = s->cert->key->privatekey->pkey.ec;
2267 priv_key = EC_KEY_get0_private_key(tkey);
2268 if (priv_key == NULL) {
2269 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2270 ERR_R_MALLOC_FAILURE);
2271 goto err;
2272 }
2273 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) {
2274 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB);
2275 goto err;
2276 }
2277 } else {
2278 /* Generate a new ECDH key pair */
2279 if (!(EC_KEY_generate_key(clnt_ecdh))) {
2280 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2281 ERR_R_ECDH_LIB);
2282 goto err;
2283 }
2284 }
2285
2286 /*
2287 * use the 'p' output buffer for the ECDH key, but make sure to
2288 * clear it out afterwards
2289 */
2290
2291 field_size = EC_GROUP_get_degree(srvr_group);
2292 if (field_size <= 0) {
2293 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2294 goto err;
2295 }
2296 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint,
2297 clnt_ecdh, NULL);
2298 if (n <= 0) {
2299 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2300 goto err;
2301 }
2302
2303 /* generate master key from the result */
2304 s->session->master_key_length =
2305 s->method->ssl3_enc->generate_master_secret(s,
2306 s->
2307 session->master_key,
2308 p, n);
2309
2310 memset(p, 0, n); /* clean up */
2311
2312 if (ecdh_clnt_cert) {
2313 /* Send empty client key exch message */
2314 n = 0;
2315 } else {
2316 /*
2317 * First check the size of encoding and allocate memory
2318 * accordingly.
2319 */
2320 encoded_pt_len =
2321 EC_POINT_point2oct(srvr_group,
2322 EC_KEY_get0_public_key(clnt_ecdh),
2323 POINT_CONVERSION_UNCOMPRESSED,
2324 NULL, 0, NULL);
2325
2326 encodedPoint = (unsigned char *)
2327 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char));
2328 bn_ctx = BN_CTX_new();
2329 if ((encodedPoint == NULL) || (bn_ctx == NULL)) {
2330 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2331 ERR_R_MALLOC_FAILURE);
2332 goto err;
2333 }
2334
2335 /* Encode the public key */
2336 n = EC_POINT_point2oct(srvr_group,
2337 EC_KEY_get0_public_key(clnt_ecdh),
2338 POINT_CONVERSION_UNCOMPRESSED,
2339 encodedPoint, encoded_pt_len, bn_ctx);
2340
2341 *p = n; /* length of encoded point */
2342 /* Encoded point will be copied here */
2343 p += 1;
2344 /* copy the point */
2345 memcpy((unsigned char *)p, encodedPoint, n);
2346 /* increment n to account for length field */
2347 n += 1;
2348 }
2349
2350 /* Free allocated memory */
2351 BN_CTX_free(bn_ctx);
2352 if (encodedPoint != NULL)
2353 OPENSSL_free(encodedPoint);
2354 if (clnt_ecdh != NULL)
2355 EC_KEY_free(clnt_ecdh);
2356 EVP_PKEY_free(srvr_pub_pkey);
2357 }
2358 #endif /* !OPENSSL_NO_ECDH */
2359 else {
2360 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2361 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2362 goto err;
2363 }
2364
2365 *(d++) = SSL3_MT_CLIENT_KEY_EXCHANGE;
2366 l2n3(n, d);
2367
2368 s->state = SSL3_ST_CW_KEY_EXCH_B;
2369 /* number of bytes to write */
2370 s->init_num = n + 4;
2371 s->init_off = 0;
2372 }
2373
2374 /* SSL3_ST_CW_KEY_EXCH_B */
2375 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
2376 err:
2377 #ifndef OPENSSL_NO_ECDH
2378 BN_CTX_free(bn_ctx);
2379 if (encodedPoint != NULL)
2380 OPENSSL_free(encodedPoint);
2381 if (clnt_ecdh != NULL)
2382 EC_KEY_free(clnt_ecdh);
2383 EVP_PKEY_free(srvr_pub_pkey);
2384 #endif
2385 return (-1);
2386 }
2387
2388 int ssl3_send_client_verify(SSL *s)
2389 {
2390 unsigned char *p, *d;
2391 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
2392 EVP_PKEY *pkey;
2393 #ifndef OPENSSL_NO_RSA
2394 unsigned u = 0;
2395 #endif
2396 unsigned long n;
2397 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2398 int j;
2399 #endif
2400
2401 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
2402 d = (unsigned char *)s->init_buf->data;
2403 p = &(d[4]);
2404 pkey = s->cert->key->privatekey;
2405
2406 s->method->ssl3_enc->cert_verify_mac(s, &(s->s3->finish_dgst2),
2407 &(data[MD5_DIGEST_LENGTH]));
2408
2409 #ifndef OPENSSL_NO_RSA
2410 if (pkey->type == EVP_PKEY_RSA) {
2411 s->method->ssl3_enc->cert_verify_mac(s,
2412 &(s->s3->finish_dgst1),
2413 &(data[0]));
2414 if (RSA_sign
2415 (NID_md5_sha1, data, MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
2416 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
2417 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
2418 goto err;
2419 }
2420 s2n(u, p);
2421 n = u + 2;
2422 } else
2423 #endif
2424 #ifndef OPENSSL_NO_DSA
2425 if (pkey->type == EVP_PKEY_DSA) {
2426 if (!DSA_sign(pkey->save_type,
2427 &(data[MD5_DIGEST_LENGTH]),
2428 SHA_DIGEST_LENGTH, &(p[2]),
2429 (unsigned int *)&j, pkey->pkey.dsa)) {
2430 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
2431 goto err;
2432 }
2433 s2n(j, p);
2434 n = j + 2;
2435 } else
2436 #endif
2437 #ifndef OPENSSL_NO_ECDSA
2438 if (pkey->type == EVP_PKEY_EC) {
2439 if (!ECDSA_sign(pkey->save_type,
2440 &(data[MD5_DIGEST_LENGTH]),
2441 SHA_DIGEST_LENGTH, &(p[2]),
2442 (unsigned int *)&j, pkey->pkey.ec)) {
2443 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB);
2444 goto err;
2445 }
2446 s2n(j, p);
2447 n = j + 2;
2448 } else
2449 #endif
2450 {
2451 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
2452 goto err;
2453 }
2454 *(d++) = SSL3_MT_CERTIFICATE_VERIFY;
2455 l2n3(n, d);
2456
2457 s->state = SSL3_ST_CW_CERT_VRFY_B;
2458 s->init_num = (int)n + 4;
2459 s->init_off = 0;
2460 }
2461 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
2462 err:
2463 return (-1);
2464 }
2465
2466 int ssl3_send_client_certificate(SSL *s)
2467 {
2468 X509 *x509 = NULL;
2469 EVP_PKEY *pkey = NULL;
2470 int i;
2471 unsigned long l;
2472
2473 if (s->state == SSL3_ST_CW_CERT_A) {
2474 if ((s->cert == NULL) ||
2475 (s->cert->key->x509 == NULL) ||
2476 (s->cert->key->privatekey == NULL))
2477 s->state = SSL3_ST_CW_CERT_B;
2478 else
2479 s->state = SSL3_ST_CW_CERT_C;
2480 }
2481
2482 /* We need to get a client cert */
2483 if (s->state == SSL3_ST_CW_CERT_B) {
2484 /*
2485 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
2486 * return(-1); We then get retied later
2487 */
2488 i = 0;
2489 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2490 if (i < 0) {
2491 s->rwstate = SSL_X509_LOOKUP;
2492 return (-1);
2493 }
2494 s->rwstate = SSL_NOTHING;
2495 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
2496 s->state = SSL3_ST_CW_CERT_B;
2497 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
2498 i = 0;
2499 } else if (i == 1) {
2500 i = 0;
2501 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,
2502 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2503 }
2504
2505 if (x509 != NULL)
2506 X509_free(x509);
2507 if (pkey != NULL)
2508 EVP_PKEY_free(pkey);
2509 if (i == 0) {
2510 if (s->version == SSL3_VERSION) {
2511 s->s3->tmp.cert_req = 0;
2512 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
2513 return (1);
2514 } else {
2515 s->s3->tmp.cert_req = 2;
2516 }
2517 }
2518
2519 /* Ok, we have a cert */
2520 s->state = SSL3_ST_CW_CERT_C;
2521 }
2522
2523 if (s->state == SSL3_ST_CW_CERT_C) {
2524 s->state = SSL3_ST_CW_CERT_D;
2525 l = ssl3_output_cert_chain(s,
2526 (s->s3->tmp.cert_req ==
2527 2) ? NULL : s->cert->key->x509);
2528 s->init_num = (int)l;
2529 s->init_off = 0;
2530 }
2531 /* SSL3_ST_CW_CERT_D */
2532 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE));
2533 }
2534
2535 #define has_bits(i,m) (((i)&(m)) == (m))
2536
2537 int ssl3_check_cert_and_algorithm(SSL *s)
2538 {
2539 int i, idx;
2540 long algs;
2541 EVP_PKEY *pkey = NULL;
2542 SESS_CERT *sc;
2543 #ifndef OPENSSL_NO_RSA
2544 RSA *rsa;
2545 #endif
2546 #ifndef OPENSSL_NO_DH
2547 DH *dh;
2548 #endif
2549
2550 sc = s->session->sess_cert;
2551
2552 algs = s->s3->tmp.new_cipher->algorithms;
2553
2554 /* we don't have a certificate */
2555 if (algs & (SSL_aDH | SSL_aNULL | SSL_aKRB5))
2556 return (1);
2557
2558 if (sc == NULL) {
2559 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
2560 goto err;
2561 }
2562 #ifndef OPENSSL_NO_RSA
2563 rsa = s->session->sess_cert->peer_rsa_tmp;
2564 #endif
2565 #ifndef OPENSSL_NO_DH
2566 dh = s->session->sess_cert->peer_dh_tmp;
2567 #endif
2568
2569 /* This is the passed certificate */
2570
2571 idx = sc->peer_cert_type;
2572 #ifndef OPENSSL_NO_ECDH
2573 if (idx == SSL_PKEY_ECC) {
2574 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2575 s->s3->tmp.new_cipher) == 0) {
2576 /* check failed */
2577 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
2578 goto f_err;
2579 } else {
2580 return 1;
2581 }
2582 }
2583 #endif
2584 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509);
2585 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey);
2586 EVP_PKEY_free(pkey);
2587
2588 /* Check that we have a certificate if we require one */
2589 if ((algs & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
2590 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2591 SSL_R_MISSING_RSA_SIGNING_CERT);
2592 goto f_err;
2593 }
2594 #ifndef OPENSSL_NO_DSA
2595 else if ((algs & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
2596 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2597 SSL_R_MISSING_DSA_SIGNING_CERT);
2598 goto f_err;
2599 }
2600 #endif
2601 #ifndef OPENSSL_NO_RSA
2602 if ((algs & SSL_kRSA) &&
2603 !(has_bits(i, EVP_PK_RSA | EVP_PKT_ENC) || (rsa != NULL))) {
2604 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2605 SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2606 goto f_err;
2607 }
2608 #endif
2609 #ifndef OPENSSL_NO_DH
2610 if ((algs & SSL_kEDH) &&
2611 !(has_bits(i, EVP_PK_DH | EVP_PKT_EXCH) || (dh != NULL))) {
2612 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_DH_KEY);
2613 goto f_err;
2614 } else if ((algs & SSL_kDHr) && !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) {
2615 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2616 SSL_R_MISSING_DH_RSA_CERT);
2617 goto f_err;
2618 }
2619 # ifndef OPENSSL_NO_DSA
2620 else if ((algs & SSL_kDHd) && !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) {
2621 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2622 SSL_R_MISSING_DH_DSA_CERT);
2623 goto f_err;
2624 }
2625 # endif
2626 #endif
2627
2628 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i, EVP_PKT_EXP)) {
2629 #ifndef OPENSSL_NO_RSA
2630 if (algs & SSL_kRSA) {
2631 if (rsa == NULL
2632 || RSA_size(rsa) * 8 >
2633 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
2634 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2635 SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2636 goto f_err;
2637 }
2638 } else
2639 #endif
2640 #ifndef OPENSSL_NO_DH
2641 if (algs & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
2642 if (dh == NULL
2643 || DH_size(dh) * 8 >
2644 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) {
2645 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2646 SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2647 goto f_err;
2648 }
2649 } else
2650 #endif
2651 {
2652 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
2653 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2654 goto f_err;
2655 }
2656 }
2657 return (1);
2658 f_err:
2659 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2660 err:
2661 return (0);
2662 }
2663
2664 #ifndef OPENSSL_NO_ECDH
2665 /* This is the complement of nid2curve_id in s3_srvr.c. */
2666 static int curve_id2nid(int curve_id)
2667 {
2668 /*
2669 * ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001) (no changes
2670 * in draft-ietf-tls-ecc-03.txt [June 2003])
2671 */
2672 static int nid_list[26] = {
2673 0,
2674 NID_sect163k1, /* sect163k1 (1) */
2675 NID_sect163r1, /* sect163r1 (2) */
2676 NID_sect163r2, /* sect163r2 (3) */
2677 NID_sect193r1, /* sect193r1 (4) */
2678 NID_sect193r2, /* sect193r2 (5) */
2679 NID_sect233k1, /* sect233k1 (6) */
2680 NID_sect233r1, /* sect233r1 (7) */
2681 NID_sect239k1, /* sect239k1 (8) */
2682 NID_sect283k1, /* sect283k1 (9) */
2683 NID_sect283r1, /* sect283r1 (10) */
2684 NID_sect409k1, /* sect409k1 (11) */
2685 NID_sect409r1, /* sect409r1 (12) */
2686 NID_sect571k1, /* sect571k1 (13) */
2687 NID_sect571r1, /* sect571r1 (14) */
2688 NID_secp160k1, /* secp160k1 (15) */
2689 NID_secp160r1, /* secp160r1 (16) */
2690 NID_secp160r2, /* secp160r2 (17) */
2691 NID_secp192k1, /* secp192k1 (18) */
2692 NID_X9_62_prime192v1, /* secp192r1 (19) */
2693 NID_secp224k1, /* secp224k1 (20) */
2694 NID_secp224r1, /* secp224r1 (21) */
2695 NID_secp256k1, /* secp256k1 (22) */
2696 NID_X9_62_prime256v1, /* secp256r1 (23) */
2697 NID_secp384r1, /* secp384r1 (24) */
2698 NID_secp521r1 /* secp521r1 (25) */
2699 };
2700
2701 if ((curve_id < 1) || (curve_id > 25))
2702 return 0;
2703
2704 return nid_list[curve_id];
2705 }
2706 #endif
2707
2708 /*
2709 * Check to see if handshake is full or resumed. Usually this is just a case
2710 * of checking to see if a cache hit has occurred. In the case of session
2711 * tickets we have to check the next message to be sure.
2712 */
2713
2714 #ifndef OPENSSL_NO_TLSEXT
2715 int ssl3_check_finished(SSL *s)
2716 {
2717 int ok;
2718 long n;
2719 /*
2720 * If we have no ticket or session ID is non-zero length (a match of a
2721 * non-zero session length would never reach here) it cannot be a resumed
2722 * session.
2723 */
2724 if (!s->session->tlsext_tick || s->session->session_id_length)
2725 return 1;
2726 /*
2727 * this function is called when we really expect a Certificate message,
2728 * so permit appropriate message length
2729 */
2730 n = s->method->ssl_get_message(s,
2731 SSL3_ST_CR_CERT_A,
2732 SSL3_ST_CR_CERT_B,
2733 -1, s->max_cert_list, &ok);
2734 if (!ok)
2735 return ((int)n);
2736 s->s3->tmp.reuse_message = 1;
2737 if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2738 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2739 return 2;
2740
2741 return 1;
2742 }
2743 #endif
2744
2745 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2746 {
2747 int i = 0;
2748 #ifndef OPENSSL_NO_ENGINE
2749 if (s->ctx->client_cert_engine) {
2750 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
2751 SSL_get_client_CA_list(s),
2752 px509, ppkey, NULL, NULL, NULL);
2753 if (i != 0)
2754 return i;
2755 }
2756 #endif
2757 if (s->ctx->client_cert_cb)
2758 i = s->ctx->client_cert_cb(s, px509, ppkey);
2759 return i;
2760 }
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