1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
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 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include "ssl_locl.h"
156 #include "kssl_lcl.h"
157 #include <openssl/buffer.h>
158 #include <openssl/rand.h>
159 #include <openssl/objects.h>
160 #include <openssl/evp.h>
161 #include <openssl/hmac.h>
162 #include <openssl/x509.h>
163 #ifndef OPENSSL_NO_DH
164 #include <openssl/dh.h>
165 #endif
166 #include <openssl/bn.h>
167 #ifndef OPENSSL_NO_KRB5
168 #include <openssl/krb5_asn.h>
169 #endif
170 #include <openssl/md5.h>
171
172 static const SSL_METHOD *ssl3_get_server_method(int ver);
173
ssl3_get_server_method(int ver)174 static const SSL_METHOD *ssl3_get_server_method(int ver)
175 {
176 if (ver == SSL3_VERSION)
177 return(SSLv3_server_method());
178 else
179 return(NULL);
180 }
181
IMPLEMENT_ssl3_meth_func(SSLv3_server_method,ssl3_accept,ssl_undefined_function,ssl3_get_server_method)182 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
183 ssl3_accept,
184 ssl_undefined_function,
185 ssl3_get_server_method)
186
187 int ssl3_accept(SSL *s)
188 {
189 BUF_MEM *buf;
190 unsigned long alg_k,Time=(unsigned long)time(NULL);
191 void (*cb)(const SSL *ssl,int type,int val)=NULL;
192 int ret= -1;
193 int new_state,state,skip=0;
194
195 RAND_add(&Time,sizeof(Time),0);
196 ERR_clear_error();
197 clear_sys_error();
198
199 if (s->info_callback != NULL)
200 cb=s->info_callback;
201 else if (s->ctx->info_callback != NULL)
202 cb=s->ctx->info_callback;
203
204 /* init things to blank */
205 s->in_handshake++;
206 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
207
208 if (s->cert == NULL)
209 {
210 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
211 return(-1);
212 }
213
214 for (;;)
215 {
216 state=s->state;
217
218 switch (s->state)
219 {
220 case SSL_ST_RENEGOTIATE:
221 s->new_session=1;
222 /* s->state=SSL_ST_ACCEPT; */
223
224 case SSL_ST_BEFORE:
225 case SSL_ST_ACCEPT:
226 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
227 case SSL_ST_OK|SSL_ST_ACCEPT:
228
229 s->server=1;
230 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
231
232 if ((s->version>>8) != 3)
233 {
234 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
235 return -1;
236 }
237 s->type=SSL_ST_ACCEPT;
238
239 if (s->init_buf == NULL)
240 {
241 if ((buf=BUF_MEM_new()) == NULL)
242 {
243 ret= -1;
244 goto end;
245 }
246 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
247 {
248 ret= -1;
249 goto end;
250 }
251 s->init_buf=buf;
252 }
253
254 if (!ssl3_setup_buffers(s))
255 {
256 ret= -1;
257 goto end;
258 }
259
260 s->init_num=0;
261
262 if (s->state != SSL_ST_RENEGOTIATE)
263 {
264 /* Ok, we now need to push on a buffering BIO so that
265 * the output is sent in a way that TCP likes :-)
266 */
267 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
268
269 ssl3_init_finished_mac(s);
270 s->state=SSL3_ST_SR_CLNT_HELLO_A;
271 s->ctx->stats.sess_accept++;
272 }
273 else if (!s->s3->send_connection_binding &&
274 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
275 {
276 /* Server attempting to renegotiate with
277 * client that doesn't support secure
278 * renegotiation.
279 */
280 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
281 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
282 ret = -1;
283 goto end;
284 }
285 else
286 {
287 /* s->state == SSL_ST_RENEGOTIATE,
288 * we will just send a HelloRequest */
289 s->ctx->stats.sess_accept_renegotiate++;
290 s->state=SSL3_ST_SW_HELLO_REQ_A;
291 }
292 break;
293
294 case SSL3_ST_SW_HELLO_REQ_A:
295 case SSL3_ST_SW_HELLO_REQ_B:
296
297 s->shutdown=0;
298 ret=ssl3_send_hello_request(s);
299 if (ret <= 0) goto end;
300 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
301 s->state=SSL3_ST_SW_FLUSH;
302 s->init_num=0;
303
304 ssl3_init_finished_mac(s);
305 break;
306
307 case SSL3_ST_SW_HELLO_REQ_C:
308 s->state=SSL_ST_OK;
309 break;
310
311 case SSL3_ST_SR_CLNT_HELLO_A:
312 case SSL3_ST_SR_CLNT_HELLO_B:
313 case SSL3_ST_SR_CLNT_HELLO_C:
314
315 s->shutdown=0;
316 ret=ssl3_get_client_hello(s);
317 if (ret <= 0) goto end;
318
319 s->new_session = 2;
320 s->state=SSL3_ST_SW_SRVR_HELLO_A;
321 s->init_num=0;
322 break;
323
324 case SSL3_ST_SW_SRVR_HELLO_A:
325 case SSL3_ST_SW_SRVR_HELLO_B:
326 ret=ssl3_send_server_hello(s);
327 if (ret <= 0) goto end;
328 #ifndef OPENSSL_NO_TLSEXT
329 if (s->hit)
330 {
331 if (s->tlsext_ticket_expected)
332 s->state=SSL3_ST_SW_SESSION_TICKET_A;
333 else
334 s->state=SSL3_ST_SW_CHANGE_A;
335 }
336 #else
337 if (s->hit)
338 s->state=SSL3_ST_SW_CHANGE_A;
339 #endif
340 else
341 s->state=SSL3_ST_SW_CERT_A;
342 s->init_num=0;
343 break;
344
345 case SSL3_ST_SW_CERT_A:
346 case SSL3_ST_SW_CERT_B:
347 /* Check if it is anon DH or anon ECDH, */
348 /* normal PSK or KRB5 */
349 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
350 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
351 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
352 {
353 ret=ssl3_send_server_certificate(s);
354 if (ret <= 0) goto end;
355 #ifndef OPENSSL_NO_TLSEXT
356 if (s->tlsext_status_expected)
357 s->state=SSL3_ST_SW_CERT_STATUS_A;
358 else
359 s->state=SSL3_ST_SW_KEY_EXCH_A;
360 }
361 else
362 {
363 skip = 1;
364 s->state=SSL3_ST_SW_KEY_EXCH_A;
365 }
366 #else
367 }
368 else
369 skip=1;
370
371 s->state=SSL3_ST_SW_KEY_EXCH_A;
372 #endif
373 s->init_num=0;
374 break;
375
376 case SSL3_ST_SW_KEY_EXCH_A:
377 case SSL3_ST_SW_KEY_EXCH_B:
378 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
379
380 /* clear this, it may get reset by
381 * send_server_key_exchange */
382 if ((s->options & SSL_OP_EPHEMERAL_RSA)
383 #ifndef OPENSSL_NO_KRB5
384 && !(alg_k & SSL_kKRB5)
385 #endif /* OPENSSL_NO_KRB5 */
386 )
387 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
388 * even when forbidden by protocol specs
389 * (handshake may fail as clients are not required to
390 * be able to handle this) */
391 s->s3->tmp.use_rsa_tmp=1;
392 else
393 s->s3->tmp.use_rsa_tmp=0;
394
395
396 /* only send if a DH key exchange, fortezza or
397 * RSA but we have a sign only certificate
398 *
399 * PSK: may send PSK identity hints
400 *
401 * For ECC ciphersuites, we send a serverKeyExchange
402 * message only if the cipher suite is either
403 * ECDH-anon or ECDHE. In other cases, the
404 * server certificate contains the server's
405 * public key for key exchange.
406 */
407 if (s->s3->tmp.use_rsa_tmp
408 /* PSK: send ServerKeyExchange if PSK identity
409 * hint if provided */
410 #ifndef OPENSSL_NO_PSK
411 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
412 #endif
413 || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
414 || (alg_k & SSL_kEECDH)
415 || ((alg_k & SSL_kRSA)
416 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
417 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
418 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
419 )
420 )
421 )
422 )
423 {
424 ret=ssl3_send_server_key_exchange(s);
425 if (ret <= 0) goto end;
426 }
427 else
428 skip=1;
429
430 s->state=SSL3_ST_SW_CERT_REQ_A;
431 s->init_num=0;
432 break;
433
434 case SSL3_ST_SW_CERT_REQ_A:
435 case SSL3_ST_SW_CERT_REQ_B:
436 if (/* don't request cert unless asked for it: */
437 !(s->verify_mode & SSL_VERIFY_PEER) ||
438 /* if SSL_VERIFY_CLIENT_ONCE is set,
439 * don't request cert during re-negotiation: */
440 ((s->session->peer != NULL) &&
441 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
442 /* never request cert in anonymous ciphersuites
443 * (see section "Certificate request" in SSL 3 drafts
444 * and in RFC 2246): */
445 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
446 /* ... except when the application insists on verification
447 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
448 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
449 /* never request cert in Kerberos ciphersuites */
450 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
451 /* With normal PSK Certificates and
452 * Certificate Requests are omitted */
453 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
454 {
455 /* no cert request */
456 skip=1;
457 s->s3->tmp.cert_request=0;
458 s->state=SSL3_ST_SW_SRVR_DONE_A;
459 }
460 else
461 {
462 s->s3->tmp.cert_request=1;
463 ret=ssl3_send_certificate_request(s);
464 if (ret <= 0) goto end;
465 #ifndef NETSCAPE_HANG_BUG
466 s->state=SSL3_ST_SW_SRVR_DONE_A;
467 #else
468 s->state=SSL3_ST_SW_FLUSH;
469 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
470 #endif
471 s->init_num=0;
472 }
473 break;
474
475 case SSL3_ST_SW_SRVR_DONE_A:
476 case SSL3_ST_SW_SRVR_DONE_B:
477 ret=ssl3_send_server_done(s);
478 if (ret <= 0) goto end;
479 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
480 s->state=SSL3_ST_SW_FLUSH;
481 s->init_num=0;
482 break;
483
484 case SSL3_ST_SW_FLUSH:
485
486 /* This code originally checked to see if
487 * any data was pending using BIO_CTRL_INFO
488 * and then flushed. This caused problems
489 * as documented in PR#1939. The proposed
490 * fix doesn't completely resolve this issue
491 * as buggy implementations of BIO_CTRL_PENDING
492 * still exist. So instead we just flush
493 * unconditionally.
494 */
495
496 s->rwstate=SSL_WRITING;
497 if (BIO_flush(s->wbio) <= 0)
498 {
499 ret= -1;
500 goto end;
501 }
502 s->rwstate=SSL_NOTHING;
503
504 s->state=s->s3->tmp.next_state;
505 break;
506
507 case SSL3_ST_SR_CERT_A:
508 case SSL3_ST_SR_CERT_B:
509 /* Check for second client hello (MS SGC) */
510 ret = ssl3_check_client_hello(s);
511 if (ret <= 0)
512 goto end;
513 if (ret == 2)
514 s->state = SSL3_ST_SR_CLNT_HELLO_C;
515 else {
516 if (s->s3->tmp.cert_request)
517 {
518 ret=ssl3_get_client_certificate(s);
519 if (ret <= 0) goto end;
520 }
521 s->init_num=0;
522 s->state=SSL3_ST_SR_KEY_EXCH_A;
523 }
524 break;
525
526 case SSL3_ST_SR_KEY_EXCH_A:
527 case SSL3_ST_SR_KEY_EXCH_B:
528 ret=ssl3_get_client_key_exchange(s);
529 if (ret <= 0)
530 goto end;
531 if (ret == 2)
532 {
533 /* For the ECDH ciphersuites when
534 * the client sends its ECDH pub key in
535 * a certificate, the CertificateVerify
536 * message is not sent.
537 * Also for GOST ciphersuites when
538 * the client uses its key from the certificate
539 * for key exchange.
540 */
541 s->state=SSL3_ST_SR_FINISHED_A;
542 s->init_num = 0;
543 }
544 else
545 {
546 int offset=0;
547 int dgst_num;
548
549 s->state=SSL3_ST_SR_CERT_VRFY_A;
550 s->init_num=0;
551
552 /* We need to get hashes here so if there is
553 * a client cert, it can be verified
554 * FIXME - digest processing for CertificateVerify
555 * should be generalized. But it is next step
556 */
557 if (s->s3->handshake_buffer)
558 if (!ssl3_digest_cached_records(s))
559 return -1;
560 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
561 if (s->s3->handshake_dgst[dgst_num])
562 {
563 int dgst_size;
564
565 s->method->ssl3_enc->cert_verify_mac(s,EVP_MD_CTX_type(s->s3->handshake_dgst[dgst_num]),&(s->s3->tmp.cert_verify_md[offset]));
566 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
567 if (dgst_size < 0)
568 {
569 ret = -1;
570 goto end;
571 }
572 offset+=dgst_size;
573 }
574 }
575 break;
576
577 case SSL3_ST_SR_CERT_VRFY_A:
578 case SSL3_ST_SR_CERT_VRFY_B:
579
580 /* we should decide if we expected this one */
581 ret=ssl3_get_cert_verify(s);
582 if (ret <= 0) goto end;
583
584 s->state=SSL3_ST_SR_FINISHED_A;
585 s->init_num=0;
586 break;
587
588 case SSL3_ST_SR_FINISHED_A:
589 case SSL3_ST_SR_FINISHED_B:
590 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
591 SSL3_ST_SR_FINISHED_B);
592 if (ret <= 0) goto end;
593 #ifndef OPENSSL_NO_TLSEXT
594 if (s->tlsext_ticket_expected)
595 s->state=SSL3_ST_SW_SESSION_TICKET_A;
596 else if (s->hit)
597 s->state=SSL_ST_OK;
598 #else
599 if (s->hit)
600 s->state=SSL_ST_OK;
601 #endif
602 else
603 s->state=SSL3_ST_SW_CHANGE_A;
604 s->init_num=0;
605 break;
606
607 #ifndef OPENSSL_NO_TLSEXT
608 case SSL3_ST_SW_SESSION_TICKET_A:
609 case SSL3_ST_SW_SESSION_TICKET_B:
610 ret=ssl3_send_newsession_ticket(s);
611 if (ret <= 0) goto end;
612 s->state=SSL3_ST_SW_CHANGE_A;
613 s->init_num=0;
614 break;
615
616 case SSL3_ST_SW_CERT_STATUS_A:
617 case SSL3_ST_SW_CERT_STATUS_B:
618 ret=ssl3_send_cert_status(s);
619 if (ret <= 0) goto end;
620 s->state=SSL3_ST_SW_KEY_EXCH_A;
621 s->init_num=0;
622 break;
623
624 #endif
625
626 case SSL3_ST_SW_CHANGE_A:
627 case SSL3_ST_SW_CHANGE_B:
628
629 s->session->cipher=s->s3->tmp.new_cipher;
630 if (!s->method->ssl3_enc->setup_key_block(s))
631 { ret= -1; goto end; }
632
633 ret=ssl3_send_change_cipher_spec(s,
634 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
635
636 if (ret <= 0) goto end;
637 s->state=SSL3_ST_SW_FINISHED_A;
638 s->init_num=0;
639
640 if (!s->method->ssl3_enc->change_cipher_state(s,
641 SSL3_CHANGE_CIPHER_SERVER_WRITE))
642 {
643 ret= -1;
644 goto end;
645 }
646
647 break;
648
649 case SSL3_ST_SW_FINISHED_A:
650 case SSL3_ST_SW_FINISHED_B:
651 ret=ssl3_send_finished(s,
652 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
653 s->method->ssl3_enc->server_finished_label,
654 s->method->ssl3_enc->server_finished_label_len);
655 if (ret <= 0) goto end;
656 s->state=SSL3_ST_SW_FLUSH;
657 if (s->hit)
658 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
659 else
660 s->s3->tmp.next_state=SSL_ST_OK;
661 s->init_num=0;
662 break;
663
664 case SSL_ST_OK:
665 /* clean a few things up */
666 ssl3_cleanup_key_block(s);
667
668 BUF_MEM_free(s->init_buf);
669 s->init_buf=NULL;
670
671 /* remove buffering on output */
672 ssl_free_wbio_buffer(s);
673
674 s->init_num=0;
675
676 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
677 {
678 /* actually not necessarily a 'new' session unless
679 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
680
681 s->new_session=0;
682
683 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
684
685 s->ctx->stats.sess_accept_good++;
686 /* s->server=1; */
687 s->handshake_func=ssl3_accept;
688
689 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
690 }
691
692 ret = 1;
693 goto end;
694 /* break; */
695
696 default:
697 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
698 ret= -1;
699 goto end;
700 /* break; */
701 }
702
703 if (!s->s3->tmp.reuse_message && !skip)
704 {
705 if (s->debug)
706 {
707 if ((ret=BIO_flush(s->wbio)) <= 0)
708 goto end;
709 }
710
711
712 if ((cb != NULL) && (s->state != state))
713 {
714 new_state=s->state;
715 s->state=state;
716 cb(s,SSL_CB_ACCEPT_LOOP,1);
717 s->state=new_state;
718 }
719 }
720 skip=0;
721 }
722 end:
723 /* BIO_flush(s->wbio); */
724
725 s->in_handshake--;
726 if (cb != NULL)
727 cb(s,SSL_CB_ACCEPT_EXIT,ret);
728 return(ret);
729 }
730
ssl3_send_hello_request(SSL * s)731 int ssl3_send_hello_request(SSL *s)
732 {
733 unsigned char *p;
734
735 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
736 {
737 p=(unsigned char *)s->init_buf->data;
738 *(p++)=SSL3_MT_HELLO_REQUEST;
739 *(p++)=0;
740 *(p++)=0;
741 *(p++)=0;
742
743 s->state=SSL3_ST_SW_HELLO_REQ_B;
744 /* number of bytes to write */
745 s->init_num=4;
746 s->init_off=0;
747 }
748
749 /* SSL3_ST_SW_HELLO_REQ_B */
750 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
751 }
752
ssl3_check_client_hello(SSL * s)753 int ssl3_check_client_hello(SSL *s)
754 {
755 int ok;
756 long n;
757
758 /* this function is called when we really expect a Certificate message,
759 * so permit appropriate message length */
760 n=s->method->ssl_get_message(s,
761 SSL3_ST_SR_CERT_A,
762 SSL3_ST_SR_CERT_B,
763 -1,
764 s->max_cert_list,
765 &ok);
766 if (!ok) return((int)n);
767 s->s3->tmp.reuse_message = 1;
768 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
769 {
770 /* Throw away what we have done so far in the current handshake,
771 * which will now be aborted. (A full SSL_clear would be too much.)
772 * I hope that tmp.dh is the only thing that may need to be cleared
773 * when a handshake is not completed ... */
774 #ifndef OPENSSL_NO_DH
775 if (s->s3->tmp.dh != NULL)
776 {
777 DH_free(s->s3->tmp.dh);
778 s->s3->tmp.dh = NULL;
779 }
780 #endif
781 return 2;
782 }
783 return 1;
784 }
785
ssl3_get_client_hello(SSL * s)786 int ssl3_get_client_hello(SSL *s)
787 {
788 int i,j,ok,al,ret= -1;
789 unsigned int cookie_len;
790 long n;
791 unsigned long id;
792 unsigned char *p,*d,*q;
793 SSL_CIPHER *c;
794 #ifndef OPENSSL_NO_COMP
795 SSL_COMP *comp=NULL;
796 #endif
797 STACK_OF(SSL_CIPHER) *ciphers=NULL;
798
799 /* We do this so that we will respond with our native type.
800 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
801 * This down switching should be handled by a different method.
802 * If we are SSLv3, we will respond with SSLv3, even if prompted with
803 * TLSv1.
804 */
805 if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
806 {
807 s->state=SSL3_ST_SR_CLNT_HELLO_B;
808 }
809 s->first_packet=1;
810 n=s->method->ssl_get_message(s,
811 SSL3_ST_SR_CLNT_HELLO_B,
812 SSL3_ST_SR_CLNT_HELLO_C,
813 SSL3_MT_CLIENT_HELLO,
814 SSL3_RT_MAX_PLAIN_LENGTH,
815 &ok);
816
817 if (!ok) return((int)n);
818 s->first_packet=0;
819 d=p=(unsigned char *)s->init_msg;
820
821 /* use version from inside client hello, not from record header
822 * (may differ: see RFC 2246, Appendix E, second paragraph) */
823 s->client_version=(((int)p[0])<<8)|(int)p[1];
824 p+=2;
825
826 if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
827 (s->version != DTLS1_VERSION && s->client_version < s->version))
828 {
829 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
830 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
831 {
832 /* similar to ssl3_get_record, send alert using remote version number */
833 s->version = s->client_version;
834 }
835 al = SSL_AD_PROTOCOL_VERSION;
836 goto f_err;
837 }
838
839 /* If we require cookies and this ClientHello doesn't
840 * contain one, just return since we do not want to
841 * allocate any memory yet. So check cookie length...
842 */
843 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
844 {
845 unsigned int session_length, cookie_length;
846
847 session_length = *(p + SSL3_RANDOM_SIZE);
848 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
849
850 if (cookie_length == 0)
851 return 1;
852 }
853
854 /* load the client random */
855 memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
856 p+=SSL3_RANDOM_SIZE;
857
858 /* get the session-id */
859 j= *(p++);
860
861 s->hit=0;
862 /* Versions before 0.9.7 always allow session reuse during renegotiation
863 * (i.e. when s->new_session is true), option
864 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
865 * Maybe this optional behaviour should always have been the default,
866 * but we cannot safely change the default behaviour (or new applications
867 * might be written that become totally unsecure when compiled with
868 * an earlier library version)
869 */
870 if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
871 {
872 if (!s->session_creation_enabled)
873 {
874 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
875 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED);
876 goto err;
877 }
878 if (!ssl_get_new_session(s,1))
879 goto err;
880 }
881 else
882 {
883 i=ssl_get_prev_session(s, p, j, d + n);
884 if (i == 1)
885 { /* previous session */
886 s->hit=1;
887 }
888 else if (i == -1)
889 goto err;
890 else /* i == 0 */
891 {
892 if (!s->session_creation_enabled)
893 {
894 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
895 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED);
896 goto err;
897 }
898 if (!ssl_get_new_session(s,1))
899 goto err;
900 }
901 }
902
903 p+=j;
904
905 if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
906 {
907 /* cookie stuff */
908 cookie_len = *(p++);
909
910 /*
911 * The ClientHello may contain a cookie even if the
912 * HelloVerify message has not been sent--make sure that it
913 * does not cause an overflow.
914 */
915 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
916 {
917 /* too much data */
918 al = SSL_AD_DECODE_ERROR;
919 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
920 goto f_err;
921 }
922
923 /* verify the cookie if appropriate option is set. */
924 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
925 cookie_len > 0)
926 {
927 memcpy(s->d1->rcvd_cookie, p, cookie_len);
928
929 if ( s->ctx->app_verify_cookie_cb != NULL)
930 {
931 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
932 cookie_len) == 0)
933 {
934 al=SSL_AD_HANDSHAKE_FAILURE;
935 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
936 SSL_R_COOKIE_MISMATCH);
937 goto f_err;
938 }
939 /* else cookie verification succeeded */
940 }
941 else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
942 s->d1->cookie_len) != 0) /* default verification */
943 {
944 al=SSL_AD_HANDSHAKE_FAILURE;
945 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
946 SSL_R_COOKIE_MISMATCH);
947 goto f_err;
948 }
949
950 ret = 2;
951 }
952
953 p += cookie_len;
954 }
955
956 n2s(p,i);
957 if ((i == 0) && (j != 0))
958 {
959 /* we need a cipher if we are not resuming a session */
960 al=SSL_AD_ILLEGAL_PARAMETER;
961 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
962 goto f_err;
963 }
964 if ((p+i) >= (d+n))
965 {
966 /* not enough data */
967 al=SSL_AD_DECODE_ERROR;
968 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
969 goto f_err;
970 }
971 if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
972 == NULL))
973 {
974 goto err;
975 }
976 p+=i;
977
978 /* If it is a hit, check that the cipher is in the list */
979 if ((s->hit) && (i > 0))
980 {
981 j=0;
982 id=s->session->cipher->id;
983
984 #ifdef CIPHER_DEBUG
985 printf("client sent %d ciphers\n",sk_num(ciphers));
986 #endif
987 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
988 {
989 c=sk_SSL_CIPHER_value(ciphers,i);
990 #ifdef CIPHER_DEBUG
991 printf("client [%2d of %2d]:%s\n",
992 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
993 #endif
994 if (c->id == id)
995 {
996 j=1;
997 break;
998 }
999 }
1000 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1001 {
1002 /* Special case as client bug workaround: the previously used cipher may
1003 * not be in the current list, the client instead might be trying to
1004 * continue using a cipher that before wasn't chosen due to server
1005 * preferences. We'll have to reject the connection if the cipher is not
1006 * enabled, though. */
1007 c = sk_SSL_CIPHER_value(ciphers, 0);
1008 if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1009 {
1010 s->session->cipher = c;
1011 j = 1;
1012 }
1013 }
1014 if (j == 0)
1015 {
1016 /* we need to have the cipher in the cipher
1017 * list if we are asked to reuse it */
1018 al=SSL_AD_ILLEGAL_PARAMETER;
1019 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1020 goto f_err;
1021 }
1022 }
1023
1024 /* compression */
1025 i= *(p++);
1026 if ((p+i) > (d+n))
1027 {
1028 /* not enough data */
1029 al=SSL_AD_DECODE_ERROR;
1030 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1031 goto f_err;
1032 }
1033 q=p;
1034 for (j=0; j<i; j++)
1035 {
1036 if (p[j] == 0) break;
1037 }
1038
1039 p+=i;
1040 if (j >= i)
1041 {
1042 /* no compress */
1043 al=SSL_AD_DECODE_ERROR;
1044 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1045 goto f_err;
1046 }
1047
1048 #ifndef OPENSSL_NO_TLSEXT
1049 /* TLS extensions*/
1050 if (s->version >= SSL3_VERSION)
1051 {
1052 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1053 {
1054 /* 'al' set by ssl_parse_clienthello_tlsext */
1055 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1056 goto f_err;
1057 }
1058 }
1059 if (ssl_check_clienthello_tlsext(s) <= 0) {
1060 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1061 goto err;
1062 }
1063
1064 /* Check if we want to use external pre-shared secret for this
1065 * handshake for not reused session only. We need to generate
1066 * server_random before calling tls_session_secret_cb in order to allow
1067 * SessionTicket processing to use it in key derivation. */
1068 {
1069 unsigned long Time;
1070 unsigned char *pos;
1071 Time=(unsigned long)time(NULL); /* Time */
1072 pos=s->s3->server_random;
1073 l2n(Time,pos);
1074 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1075 {
1076 al=SSL_AD_INTERNAL_ERROR;
1077 goto f_err;
1078 }
1079 }
1080
1081 if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1082 {
1083 SSL_CIPHER *pref_cipher=NULL;
1084
1085 s->session->master_key_length=sizeof(s->session->master_key);
1086 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1087 ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1088 {
1089 s->hit=1;
1090 s->session->ciphers=ciphers;
1091 s->session->verify_result=X509_V_OK;
1092
1093 ciphers=NULL;
1094
1095 /* check if some cipher was preferred by call back */
1096 pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1097 if (pref_cipher == NULL)
1098 {
1099 al=SSL_AD_HANDSHAKE_FAILURE;
1100 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1101 goto f_err;
1102 }
1103
1104 s->session->cipher=pref_cipher;
1105
1106 if (s->cipher_list)
1107 sk_SSL_CIPHER_free(s->cipher_list);
1108
1109 if (s->cipher_list_by_id)
1110 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1111
1112 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1113 s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1114 }
1115 }
1116 #endif
1117
1118 /* Worst case, we will use the NULL compression, but if we have other
1119 * options, we will now look for them. We have i-1 compression
1120 * algorithms from the client, starting at q. */
1121 s->s3->tmp.new_compression=NULL;
1122 #ifndef OPENSSL_NO_COMP
1123 /* This only happens if we have a cache hit */
1124 if (s->session->compress_meth != 0)
1125 {
1126 int m, comp_id = s->session->compress_meth;
1127 /* Perform sanity checks on resumed compression algorithm */
1128 /* Can't disable compression */
1129 if (s->options & SSL_OP_NO_COMPRESSION)
1130 {
1131 al=SSL_AD_INTERNAL_ERROR;
1132 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1133 goto f_err;
1134 }
1135 /* Look for resumed compression method */
1136 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1137 {
1138 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1139 if (comp_id == comp->id)
1140 {
1141 s->s3->tmp.new_compression=comp;
1142 break;
1143 }
1144 }
1145 if (s->s3->tmp.new_compression == NULL)
1146 {
1147 al=SSL_AD_INTERNAL_ERROR;
1148 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1149 goto f_err;
1150 }
1151 /* Look for resumed method in compression list */
1152 for (m = 0; m < i; m++)
1153 {
1154 if (q[m] == comp_id)
1155 break;
1156 }
1157 if (m >= i)
1158 {
1159 al=SSL_AD_ILLEGAL_PARAMETER;
1160 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1161 goto f_err;
1162 }
1163 }
1164 else if (s->hit)
1165 comp = NULL;
1166 else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1167 { /* See if we have a match */
1168 int m,nn,o,v,done=0;
1169
1170 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1171 for (m=0; m<nn; m++)
1172 {
1173 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1174 v=comp->id;
1175 for (o=0; o<i; o++)
1176 {
1177 if (v == q[o])
1178 {
1179 done=1;
1180 break;
1181 }
1182 }
1183 if (done) break;
1184 }
1185 if (done)
1186 s->s3->tmp.new_compression=comp;
1187 else
1188 comp=NULL;
1189 }
1190 #else
1191 /* If compression is disabled we'd better not try to resume a session
1192 * using compression.
1193 */
1194 if (s->session->compress_meth != 0)
1195 {
1196 al=SSL_AD_INTERNAL_ERROR;
1197 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1198 goto f_err;
1199 }
1200 #endif
1201
1202 /* Given s->session->ciphers and SSL_get_ciphers, we must
1203 * pick a cipher */
1204
1205 if (!s->hit)
1206 {
1207 #ifdef OPENSSL_NO_COMP
1208 s->session->compress_meth=0;
1209 #else
1210 s->session->compress_meth=(comp == NULL)?0:comp->id;
1211 #endif
1212 if (s->session->ciphers != NULL)
1213 sk_SSL_CIPHER_free(s->session->ciphers);
1214 s->session->ciphers=ciphers;
1215 if (ciphers == NULL)
1216 {
1217 al=SSL_AD_ILLEGAL_PARAMETER;
1218 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1219 goto f_err;
1220 }
1221 ciphers=NULL;
1222 c=ssl3_choose_cipher(s,s->session->ciphers,
1223 SSL_get_ciphers(s));
1224
1225 if (c == NULL)
1226 {
1227 al=SSL_AD_HANDSHAKE_FAILURE;
1228 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1229 goto f_err;
1230 }
1231 s->s3->tmp.new_cipher=c;
1232 }
1233 else
1234 {
1235 /* Session-id reuse */
1236 #ifdef REUSE_CIPHER_BUG
1237 STACK_OF(SSL_CIPHER) *sk;
1238 SSL_CIPHER *nc=NULL;
1239 SSL_CIPHER *ec=NULL;
1240
1241 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1242 {
1243 sk=s->session->ciphers;
1244 for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1245 {
1246 c=sk_SSL_CIPHER_value(sk,i);
1247 if (c->algorithm_enc & SSL_eNULL)
1248 nc=c;
1249 if (SSL_C_IS_EXPORT(c))
1250 ec=c;
1251 }
1252 if (nc != NULL)
1253 s->s3->tmp.new_cipher=nc;
1254 else if (ec != NULL)
1255 s->s3->tmp.new_cipher=ec;
1256 else
1257 s->s3->tmp.new_cipher=s->session->cipher;
1258 }
1259 else
1260 #endif
1261 s->s3->tmp.new_cipher=s->session->cipher;
1262 }
1263
1264 if (!ssl3_digest_cached_records(s))
1265 goto f_err;
1266
1267 /* we now have the following setup.
1268 * client_random
1269 * cipher_list - our prefered list of ciphers
1270 * ciphers - the clients prefered list of ciphers
1271 * compression - basically ignored right now
1272 * ssl version is set - sslv3
1273 * s->session - The ssl session has been setup.
1274 * s->hit - session reuse flag
1275 * s->tmp.new_cipher - the new cipher to use.
1276 */
1277
1278 if (ret < 0) ret=1;
1279 if (0)
1280 {
1281 f_err:
1282 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1283 }
1284 err:
1285 if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1286 return(ret);
1287 }
1288
ssl3_send_server_hello(SSL * s)1289 int ssl3_send_server_hello(SSL *s)
1290 {
1291 unsigned char *buf;
1292 unsigned char *p,*d;
1293 int i,sl;
1294 unsigned long l;
1295 #ifdef OPENSSL_NO_TLSEXT
1296 unsigned long Time;
1297 #endif
1298
1299 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1300 {
1301 buf=(unsigned char *)s->init_buf->data;
1302 #ifdef OPENSSL_NO_TLSEXT
1303 p=s->s3->server_random;
1304 /* Generate server_random if it was not needed previously */
1305 Time=(unsigned long)time(NULL); /* Time */
1306 l2n(Time,p);
1307 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1308 return -1;
1309 #endif
1310 /* Do the message type and length last */
1311 d=p= &(buf[4]);
1312
1313 *(p++)=s->version>>8;
1314 *(p++)=s->version&0xff;
1315
1316 /* Random stuff */
1317 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1318 p+=SSL3_RANDOM_SIZE;
1319
1320 /* now in theory we have 3 options to sending back the
1321 * session id. If it is a re-use, we send back the
1322 * old session-id, if it is a new session, we send
1323 * back the new session-id or we send back a 0 length
1324 * session-id if we want it to be single use.
1325 * Currently I will not implement the '0' length session-id
1326 * 12-Jan-98 - I'll now support the '0' length stuff.
1327 *
1328 * We also have an additional case where stateless session
1329 * resumption is successful: we always send back the old
1330 * session id. In this case s->hit is non zero: this can
1331 * only happen if stateless session resumption is succesful
1332 * if session caching is disabled so existing functionality
1333 * is unaffected.
1334 */
1335 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1336 && !s->hit)
1337 s->session->session_id_length=0;
1338
1339 sl=s->session->session_id_length;
1340 if (sl > (int)sizeof(s->session->session_id))
1341 {
1342 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1343 return -1;
1344 }
1345 *(p++)=sl;
1346 memcpy(p,s->session->session_id,sl);
1347 p+=sl;
1348
1349 /* put the cipher */
1350 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1351 p+=i;
1352
1353 /* put the compression method */
1354 #ifdef OPENSSL_NO_COMP
1355 *(p++)=0;
1356 #else
1357 if (s->s3->tmp.new_compression == NULL)
1358 *(p++)=0;
1359 else
1360 *(p++)=s->s3->tmp.new_compression->id;
1361 #endif
1362 #ifndef OPENSSL_NO_TLSEXT
1363 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1364 {
1365 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1366 return -1;
1367 }
1368 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1369 {
1370 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1371 return -1;
1372 }
1373 #endif
1374 /* do the header */
1375 l=(p-d);
1376 d=buf;
1377 *(d++)=SSL3_MT_SERVER_HELLO;
1378 l2n3(l,d);
1379
1380 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1381 /* number of bytes to write */
1382 s->init_num=p-buf;
1383 s->init_off=0;
1384 }
1385
1386 /* SSL3_ST_SW_SRVR_HELLO_B */
1387 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1388 }
1389
ssl3_send_server_done(SSL * s)1390 int ssl3_send_server_done(SSL *s)
1391 {
1392 unsigned char *p;
1393
1394 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1395 {
1396 p=(unsigned char *)s->init_buf->data;
1397
1398 /* do the header */
1399 *(p++)=SSL3_MT_SERVER_DONE;
1400 *(p++)=0;
1401 *(p++)=0;
1402 *(p++)=0;
1403
1404 s->state=SSL3_ST_SW_SRVR_DONE_B;
1405 /* number of bytes to write */
1406 s->init_num=4;
1407 s->init_off=0;
1408 }
1409
1410 /* SSL3_ST_SW_SRVR_DONE_B */
1411 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1412 }
1413
ssl3_send_server_key_exchange(SSL * s)1414 int ssl3_send_server_key_exchange(SSL *s)
1415 {
1416 #ifndef OPENSSL_NO_RSA
1417 unsigned char *q;
1418 int j,num;
1419 RSA *rsa;
1420 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1421 unsigned int u;
1422 #endif
1423 #ifndef OPENSSL_NO_DH
1424 DH *dh=NULL,*dhp;
1425 #endif
1426 #ifndef OPENSSL_NO_ECDH
1427 EC_KEY *ecdh=NULL, *ecdhp;
1428 unsigned char *encodedPoint = NULL;
1429 int encodedlen = 0;
1430 int curve_id = 0;
1431 BN_CTX *bn_ctx = NULL;
1432 #endif
1433 EVP_PKEY *pkey;
1434 unsigned char *p,*d;
1435 int al,i;
1436 unsigned long type;
1437 int n;
1438 CERT *cert;
1439 BIGNUM *r[4];
1440 int nr[4],kn;
1441 BUF_MEM *buf;
1442 EVP_MD_CTX md_ctx;
1443
1444 EVP_MD_CTX_init(&md_ctx);
1445 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1446 {
1447 type=s->s3->tmp.new_cipher->algorithm_mkey;
1448 cert=s->cert;
1449
1450 buf=s->init_buf;
1451
1452 r[0]=r[1]=r[2]=r[3]=NULL;
1453 n=0;
1454 #ifndef OPENSSL_NO_RSA
1455 if (type & SSL_kRSA)
1456 {
1457 rsa=cert->rsa_tmp;
1458 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1459 {
1460 rsa=s->cert->rsa_tmp_cb(s,
1461 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1462 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1463 if(rsa == NULL)
1464 {
1465 al=SSL_AD_HANDSHAKE_FAILURE;
1466 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1467 goto f_err;
1468 }
1469 RSA_up_ref(rsa);
1470 cert->rsa_tmp=rsa;
1471 }
1472 if (rsa == NULL)
1473 {
1474 al=SSL_AD_HANDSHAKE_FAILURE;
1475 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1476 goto f_err;
1477 }
1478 r[0]=rsa->n;
1479 r[1]=rsa->e;
1480 s->s3->tmp.use_rsa_tmp=1;
1481 }
1482 else
1483 #endif
1484 #ifndef OPENSSL_NO_DH
1485 if (type & SSL_kEDH)
1486 {
1487 dhp=cert->dh_tmp;
1488 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1489 dhp=s->cert->dh_tmp_cb(s,
1490 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1491 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1492 if (dhp == NULL)
1493 {
1494 al=SSL_AD_HANDSHAKE_FAILURE;
1495 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1496 goto f_err;
1497 }
1498
1499 if (s->s3->tmp.dh != NULL)
1500 {
1501 DH_free(dh);
1502 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1503 goto err;
1504 }
1505
1506 if ((dh=DHparams_dup(dhp)) == NULL)
1507 {
1508 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1509 goto err;
1510 }
1511
1512 s->s3->tmp.dh=dh;
1513 if ((dhp->pub_key == NULL ||
1514 dhp->priv_key == NULL ||
1515 (s->options & SSL_OP_SINGLE_DH_USE)))
1516 {
1517 if(!DH_generate_key(dh))
1518 {
1519 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1520 ERR_R_DH_LIB);
1521 goto err;
1522 }
1523 }
1524 else
1525 {
1526 dh->pub_key=BN_dup(dhp->pub_key);
1527 dh->priv_key=BN_dup(dhp->priv_key);
1528 if ((dh->pub_key == NULL) ||
1529 (dh->priv_key == NULL))
1530 {
1531 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1532 goto err;
1533 }
1534 }
1535 r[0]=dh->p;
1536 r[1]=dh->g;
1537 r[2]=dh->pub_key;
1538 }
1539 else
1540 #endif
1541 #ifndef OPENSSL_NO_ECDH
1542 if (type & SSL_kEECDH)
1543 {
1544 const EC_GROUP *group;
1545
1546 ecdhp=cert->ecdh_tmp;
1547 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1548 {
1549 ecdhp=s->cert->ecdh_tmp_cb(s,
1550 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1551 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1552 }
1553 if (ecdhp == NULL)
1554 {
1555 al=SSL_AD_HANDSHAKE_FAILURE;
1556 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1557 goto f_err;
1558 }
1559
1560 if (s->s3->tmp.ecdh != NULL)
1561 {
1562 EC_KEY_free(s->s3->tmp.ecdh);
1563 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1564 goto err;
1565 }
1566
1567 /* Duplicate the ECDH structure. */
1568 if (ecdhp == NULL)
1569 {
1570 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1571 goto err;
1572 }
1573 if (!EC_KEY_up_ref(ecdhp))
1574 {
1575 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1576 goto err;
1577 }
1578 ecdh = ecdhp;
1579
1580 s->s3->tmp.ecdh=ecdh;
1581 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1582 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1583 (s->options & SSL_OP_SINGLE_ECDH_USE))
1584 {
1585 if(!EC_KEY_generate_key(ecdh))
1586 {
1587 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1588 goto err;
1589 }
1590 }
1591
1592 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1593 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1594 (EC_KEY_get0_private_key(ecdh) == NULL))
1595 {
1596 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1597 goto err;
1598 }
1599
1600 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1601 (EC_GROUP_get_degree(group) > 163))
1602 {
1603 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1604 goto err;
1605 }
1606
1607 /* XXX: For now, we only support ephemeral ECDH
1608 * keys over named (not generic) curves. For
1609 * supported named curves, curve_id is non-zero.
1610 */
1611 if ((curve_id =
1612 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1613 == 0)
1614 {
1615 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1616 goto err;
1617 }
1618
1619 /* Encode the public key.
1620 * First check the size of encoding and
1621 * allocate memory accordingly.
1622 */
1623 encodedlen = EC_POINT_point2oct(group,
1624 EC_KEY_get0_public_key(ecdh),
1625 POINT_CONVERSION_UNCOMPRESSED,
1626 NULL, 0, NULL);
1627
1628 encodedPoint = (unsigned char *)
1629 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1630 bn_ctx = BN_CTX_new();
1631 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1632 {
1633 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1634 goto err;
1635 }
1636
1637
1638 encodedlen = EC_POINT_point2oct(group,
1639 EC_KEY_get0_public_key(ecdh),
1640 POINT_CONVERSION_UNCOMPRESSED,
1641 encodedPoint, encodedlen, bn_ctx);
1642
1643 if (encodedlen == 0)
1644 {
1645 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1646 goto err;
1647 }
1648
1649 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1650
1651 /* XXX: For now, we only support named (not
1652 * generic) curves in ECDH ephemeral key exchanges.
1653 * In this situation, we need four additional bytes
1654 * to encode the entire ServerECDHParams
1655 * structure.
1656 */
1657 n = 4 + encodedlen;
1658
1659 /* We'll generate the serverKeyExchange message
1660 * explicitly so we can set these to NULLs
1661 */
1662 r[0]=NULL;
1663 r[1]=NULL;
1664 r[2]=NULL;
1665 r[3]=NULL;
1666 }
1667 else
1668 #endif /* !OPENSSL_NO_ECDH */
1669 #ifndef OPENSSL_NO_PSK
1670 if (type & SSL_kPSK)
1671 {
1672 /* reserve size for record length and PSK identity hint*/
1673 n+=2+strlen(s->ctx->psk_identity_hint);
1674 }
1675 else
1676 #endif /* !OPENSSL_NO_PSK */
1677 {
1678 al=SSL_AD_HANDSHAKE_FAILURE;
1679 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1680 goto f_err;
1681 }
1682 for (i=0; r[i] != NULL; i++)
1683 {
1684 nr[i]=BN_num_bytes(r[i]);
1685 n+=2+nr[i];
1686 }
1687
1688 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1689 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1690 {
1691 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1692 == NULL)
1693 {
1694 al=SSL_AD_DECODE_ERROR;
1695 goto f_err;
1696 }
1697 kn=EVP_PKEY_size(pkey);
1698 }
1699 else
1700 {
1701 pkey=NULL;
1702 kn=0;
1703 }
1704
1705 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1706 {
1707 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1708 goto err;
1709 }
1710 d=(unsigned char *)s->init_buf->data;
1711 p= &(d[4]);
1712
1713 for (i=0; r[i] != NULL; i++)
1714 {
1715 s2n(nr[i],p);
1716 BN_bn2bin(r[i],p);
1717 p+=nr[i];
1718 }
1719
1720 #ifndef OPENSSL_NO_ECDH
1721 if (type & SSL_kEECDH)
1722 {
1723 /* XXX: For now, we only support named (not generic) curves.
1724 * In this situation, the serverKeyExchange message has:
1725 * [1 byte CurveType], [2 byte CurveName]
1726 * [1 byte length of encoded point], followed by
1727 * the actual encoded point itself
1728 */
1729 *p = NAMED_CURVE_TYPE;
1730 p += 1;
1731 *p = 0;
1732 p += 1;
1733 *p = curve_id;
1734 p += 1;
1735 *p = encodedlen;
1736 p += 1;
1737 memcpy((unsigned char*)p,
1738 (unsigned char *)encodedPoint,
1739 encodedlen);
1740 OPENSSL_free(encodedPoint);
1741 p += encodedlen;
1742 }
1743 #endif
1744
1745 #ifndef OPENSSL_NO_PSK
1746 if (type & SSL_kPSK)
1747 {
1748 /* copy PSK identity hint */
1749 s2n(strlen(s->ctx->psk_identity_hint), p);
1750 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1751 p+=strlen(s->ctx->psk_identity_hint);
1752 }
1753 #endif
1754
1755 /* not anonymous */
1756 if (pkey != NULL)
1757 {
1758 /* n is the length of the params, they start at &(d[4])
1759 * and p points to the space at the end. */
1760 #ifndef OPENSSL_NO_RSA
1761 if (pkey->type == EVP_PKEY_RSA)
1762 {
1763 q=md_buf;
1764 j=0;
1765 for (num=2; num > 0; num--)
1766 {
1767 EVP_DigestInit_ex(&md_ctx,(num == 2)
1768 ?s->ctx->md5:s->ctx->sha1, NULL);
1769 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1770 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1771 EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1772 EVP_DigestFinal_ex(&md_ctx,q,
1773 (unsigned int *)&i);
1774 q+=i;
1775 j+=i;
1776 }
1777 if (RSA_sign(NID_md5_sha1, md_buf, j,
1778 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1779 {
1780 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1781 goto err;
1782 }
1783 s2n(u,p);
1784 n+=u+2;
1785 }
1786 else
1787 #endif
1788 #if !defined(OPENSSL_NO_DSA)
1789 if (pkey->type == EVP_PKEY_DSA)
1790 {
1791 /* lets do DSS */
1792 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1793 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1794 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1795 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1796 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1797 (unsigned int *)&i,pkey))
1798 {
1799 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1800 goto err;
1801 }
1802 s2n(i,p);
1803 n+=i+2;
1804 }
1805 else
1806 #endif
1807 #if !defined(OPENSSL_NO_ECDSA)
1808 if (pkey->type == EVP_PKEY_EC)
1809 {
1810 /* let's do ECDSA */
1811 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1812 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1813 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1814 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1815 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1816 (unsigned int *)&i,pkey))
1817 {
1818 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1819 goto err;
1820 }
1821 s2n(i,p);
1822 n+=i+2;
1823 }
1824 else
1825 #endif
1826 {
1827 /* Is this error check actually needed? */
1828 al=SSL_AD_HANDSHAKE_FAILURE;
1829 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1830 goto f_err;
1831 }
1832 }
1833
1834 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1835 l2n3(n,d);
1836
1837 /* we should now have things packed up, so lets send
1838 * it off */
1839 s->init_num=n+4;
1840 s->init_off=0;
1841 }
1842
1843 s->state = SSL3_ST_SW_KEY_EXCH_B;
1844 EVP_MD_CTX_cleanup(&md_ctx);
1845 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1846 f_err:
1847 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1848 err:
1849 #ifndef OPENSSL_NO_ECDH
1850 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1851 BN_CTX_free(bn_ctx);
1852 #endif
1853 EVP_MD_CTX_cleanup(&md_ctx);
1854 return(-1);
1855 }
1856
ssl3_send_certificate_request(SSL * s)1857 int ssl3_send_certificate_request(SSL *s)
1858 {
1859 unsigned char *p,*d;
1860 int i,j,nl,off,n;
1861 STACK_OF(X509_NAME) *sk=NULL;
1862 X509_NAME *name;
1863 BUF_MEM *buf;
1864
1865 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1866 {
1867 buf=s->init_buf;
1868
1869 d=p=(unsigned char *)&(buf->data[4]);
1870
1871 /* get the list of acceptable cert types */
1872 p++;
1873 n=ssl3_get_req_cert_type(s,p);
1874 d[0]=n;
1875 p+=n;
1876 n++;
1877
1878 off=n;
1879 p+=2;
1880 n+=2;
1881
1882 sk=SSL_get_client_CA_list(s);
1883 nl=0;
1884 if (sk != NULL)
1885 {
1886 for (i=0; i<sk_X509_NAME_num(sk); i++)
1887 {
1888 name=sk_X509_NAME_value(sk,i);
1889 j=i2d_X509_NAME(name,NULL);
1890 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1891 {
1892 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1893 goto err;
1894 }
1895 p=(unsigned char *)&(buf->data[4+n]);
1896 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1897 {
1898 s2n(j,p);
1899 i2d_X509_NAME(name,&p);
1900 n+=2+j;
1901 nl+=2+j;
1902 }
1903 else
1904 {
1905 d=p;
1906 i2d_X509_NAME(name,&p);
1907 j-=2; s2n(j,d); j+=2;
1908 n+=j;
1909 nl+=j;
1910 }
1911 }
1912 }
1913 /* else no CA names */
1914 p=(unsigned char *)&(buf->data[4+off]);
1915 s2n(nl,p);
1916
1917 d=(unsigned char *)buf->data;
1918 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1919 l2n3(n,d);
1920
1921 /* we should now have things packed up, so lets send
1922 * it off */
1923
1924 s->init_num=n+4;
1925 s->init_off=0;
1926 #ifdef NETSCAPE_HANG_BUG
1927 p=(unsigned char *)s->init_buf->data + s->init_num;
1928
1929 /* do the header */
1930 *(p++)=SSL3_MT_SERVER_DONE;
1931 *(p++)=0;
1932 *(p++)=0;
1933 *(p++)=0;
1934 s->init_num += 4;
1935 #endif
1936
1937 s->state = SSL3_ST_SW_CERT_REQ_B;
1938 }
1939
1940 /* SSL3_ST_SW_CERT_REQ_B */
1941 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1942 err:
1943 return(-1);
1944 }
1945
ssl3_get_client_key_exchange(SSL * s)1946 int ssl3_get_client_key_exchange(SSL *s)
1947 {
1948 int i,al,ok;
1949 long n;
1950 unsigned long alg_k;
1951 unsigned char *p;
1952 #ifndef OPENSSL_NO_RSA
1953 RSA *rsa=NULL;
1954 EVP_PKEY *pkey=NULL;
1955 #endif
1956 #ifndef OPENSSL_NO_DH
1957 BIGNUM *pub=NULL;
1958 DH *dh_srvr;
1959 #endif
1960 #ifndef OPENSSL_NO_KRB5
1961 KSSL_ERR kssl_err;
1962 #endif /* OPENSSL_NO_KRB5 */
1963
1964 #ifndef OPENSSL_NO_ECDH
1965 EC_KEY *srvr_ecdh = NULL;
1966 EVP_PKEY *clnt_pub_pkey = NULL;
1967 EC_POINT *clnt_ecpoint = NULL;
1968 BN_CTX *bn_ctx = NULL;
1969 #endif
1970
1971 n=s->method->ssl_get_message(s,
1972 SSL3_ST_SR_KEY_EXCH_A,
1973 SSL3_ST_SR_KEY_EXCH_B,
1974 SSL3_MT_CLIENT_KEY_EXCHANGE,
1975 2048, /* ??? */
1976 &ok);
1977
1978 if (!ok) return((int)n);
1979 p=(unsigned char *)s->init_msg;
1980
1981 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1982
1983 #ifndef OPENSSL_NO_RSA
1984 if (alg_k & SSL_kRSA)
1985 {
1986 /* FIX THIS UP EAY EAY EAY EAY */
1987 if (s->s3->tmp.use_rsa_tmp)
1988 {
1989 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1990 rsa=s->cert->rsa_tmp;
1991 /* Don't do a callback because rsa_tmp should
1992 * be sent already */
1993 if (rsa == NULL)
1994 {
1995 al=SSL_AD_HANDSHAKE_FAILURE;
1996 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1997 goto f_err;
1998
1999 }
2000 }
2001 else
2002 {
2003 pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2004 if ( (pkey == NULL) ||
2005 (pkey->type != EVP_PKEY_RSA) ||
2006 (pkey->pkey.rsa == NULL))
2007 {
2008 al=SSL_AD_HANDSHAKE_FAILURE;
2009 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2010 goto f_err;
2011 }
2012 rsa=pkey->pkey.rsa;
2013 }
2014
2015 /* TLS and [incidentally] DTLS{0xFEFF} */
2016 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2017 {
2018 n2s(p,i);
2019 if (n != i+2)
2020 {
2021 if (!(s->options & SSL_OP_TLS_D5_BUG))
2022 {
2023 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2024 goto err;
2025 }
2026 else
2027 p-=2;
2028 }
2029 else
2030 n=i;
2031 }
2032
2033 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2034
2035 al = -1;
2036
2037 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2038 {
2039 al=SSL_AD_DECODE_ERROR;
2040 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2041 }
2042
2043 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2044 {
2045 /* The premaster secret must contain the same version number as the
2046 * ClientHello to detect version rollback attacks (strangely, the
2047 * protocol does not offer such protection for DH ciphersuites).
2048 * However, buggy clients exist that send the negotiated protocol
2049 * version instead if the server does not support the requested
2050 * protocol version.
2051 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2052 if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2053 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2054 {
2055 al=SSL_AD_DECODE_ERROR;
2056 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2057
2058 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2059 * (http://eprint.iacr.org/2003/052/) exploits the version
2060 * number check as a "bad version oracle" -- an alert would
2061 * reveal that the plaintext corresponding to some ciphertext
2062 * made up by the adversary is properly formatted except
2063 * that the version number is wrong. To avoid such attacks,
2064 * we should treat this just like any other decryption error. */
2065 }
2066 }
2067
2068 if (al != -1)
2069 {
2070 /* Some decryption failure -- use random value instead as countermeasure
2071 * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2072 * (see RFC 2246, section 7.4.7.1). */
2073 ERR_clear_error();
2074 i = SSL_MAX_MASTER_KEY_LENGTH;
2075 p[0] = s->client_version >> 8;
2076 p[1] = s->client_version & 0xff;
2077 if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2078 goto err;
2079 }
2080
2081 s->session->master_key_length=
2082 s->method->ssl3_enc->generate_master_secret(s,
2083 s->session->master_key,
2084 p,i);
2085 OPENSSL_cleanse(p,i);
2086 }
2087 else
2088 #endif
2089 #ifndef OPENSSL_NO_DH
2090 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2091 {
2092 n2s(p,i);
2093 if (n != i+2)
2094 {
2095 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2096 {
2097 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2098 goto err;
2099 }
2100 else
2101 {
2102 p-=2;
2103 i=(int)n;
2104 }
2105 }
2106
2107 if (n == 0L) /* the parameters are in the cert */
2108 {
2109 al=SSL_AD_HANDSHAKE_FAILURE;
2110 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2111 goto f_err;
2112 }
2113 else
2114 {
2115 if (s->s3->tmp.dh == NULL)
2116 {
2117 al=SSL_AD_HANDSHAKE_FAILURE;
2118 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2119 goto f_err;
2120 }
2121 else
2122 dh_srvr=s->s3->tmp.dh;
2123 }
2124
2125 pub=BN_bin2bn(p,i,NULL);
2126 if (pub == NULL)
2127 {
2128 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2129 goto err;
2130 }
2131
2132 i=DH_compute_key(p,pub,dh_srvr);
2133
2134 if (i <= 0)
2135 {
2136 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2137 goto err;
2138 }
2139
2140 DH_free(s->s3->tmp.dh);
2141 s->s3->tmp.dh=NULL;
2142
2143 BN_clear_free(pub);
2144 pub=NULL;
2145 s->session->master_key_length=
2146 s->method->ssl3_enc->generate_master_secret(s,
2147 s->session->master_key,p,i);
2148 OPENSSL_cleanse(p,i);
2149 }
2150 else
2151 #endif
2152 #ifndef OPENSSL_NO_KRB5
2153 if (alg_k & SSL_kKRB5)
2154 {
2155 krb5_error_code krb5rc;
2156 krb5_data enc_ticket;
2157 krb5_data authenticator;
2158 krb5_data enc_pms;
2159 KSSL_CTX *kssl_ctx = s->kssl_ctx;
2160 EVP_CIPHER_CTX ciph_ctx;
2161 const EVP_CIPHER *enc = NULL;
2162 unsigned char iv[EVP_MAX_IV_LENGTH];
2163 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH
2164 + EVP_MAX_BLOCK_LENGTH];
2165 int padl, outl;
2166 krb5_timestamp authtime = 0;
2167 krb5_ticket_times ttimes;
2168
2169 EVP_CIPHER_CTX_init(&ciph_ctx);
2170
2171 if (!kssl_ctx) kssl_ctx = kssl_ctx_new();
2172
2173 n2s(p,i);
2174 enc_ticket.length = i;
2175
2176 if (n < (long)(enc_ticket.length + 6))
2177 {
2178 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2179 SSL_R_DATA_LENGTH_TOO_LONG);
2180 goto err;
2181 }
2182
2183 enc_ticket.data = (char *)p;
2184 p+=enc_ticket.length;
2185
2186 n2s(p,i);
2187 authenticator.length = i;
2188
2189 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2190 {
2191 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2192 SSL_R_DATA_LENGTH_TOO_LONG);
2193 goto err;
2194 }
2195
2196 authenticator.data = (char *)p;
2197 p+=authenticator.length;
2198
2199 n2s(p,i);
2200 enc_pms.length = i;
2201 enc_pms.data = (char *)p;
2202 p+=enc_pms.length;
2203
2204 /* Note that the length is checked again below,
2205 ** after decryption
2206 */
2207 if(enc_pms.length > sizeof pms)
2208 {
2209 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2210 SSL_R_DATA_LENGTH_TOO_LONG);
2211 goto err;
2212 }
2213
2214 if (n != (long)(enc_ticket.length + authenticator.length +
2215 enc_pms.length + 6))
2216 {
2217 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2218 SSL_R_DATA_LENGTH_TOO_LONG);
2219 goto err;
2220 }
2221
2222 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2223 &kssl_err)) != 0)
2224 {
2225 #ifdef KSSL_DEBUG
2226 printf("kssl_sget_tkt rtn %d [%d]\n",
2227 krb5rc, kssl_err.reason);
2228 if (kssl_err.text)
2229 printf("kssl_err text= %s\n", kssl_err.text);
2230 #endif /* KSSL_DEBUG */
2231 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2232 kssl_err.reason);
2233 goto err;
2234 }
2235
2236 /* Note: no authenticator is not considered an error,
2237 ** but will return authtime == 0.
2238 */
2239 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2240 &authtime, &kssl_err)) != 0)
2241 {
2242 #ifdef KSSL_DEBUG
2243 printf("kssl_check_authent rtn %d [%d]\n",
2244 krb5rc, kssl_err.reason);
2245 if (kssl_err.text)
2246 printf("kssl_err text= %s\n", kssl_err.text);
2247 #endif /* KSSL_DEBUG */
2248 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2249 kssl_err.reason);
2250 goto err;
2251 }
2252
2253 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2254 {
2255 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2256 goto err;
2257 }
2258
2259 #ifdef KSSL_DEBUG
2260 kssl_ctx_show(kssl_ctx);
2261 #endif /* KSSL_DEBUG */
2262
2263 enc = kssl_map_enc(kssl_ctx->enctype);
2264 if (enc == NULL)
2265 goto err;
2266
2267 memset(iv, 0, sizeof iv); /* per RFC 1510 */
2268
2269 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2270 {
2271 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2272 SSL_R_DECRYPTION_FAILED);
2273 goto err;
2274 }
2275 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2276 (unsigned char *)enc_pms.data, enc_pms.length))
2277 {
2278 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2279 SSL_R_DECRYPTION_FAILED);
2280 goto err;
2281 }
2282 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2283 {
2284 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2285 SSL_R_DATA_LENGTH_TOO_LONG);
2286 goto err;
2287 }
2288 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2289 {
2290 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2291 SSL_R_DECRYPTION_FAILED);
2292 goto err;
2293 }
2294 outl += padl;
2295 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2296 {
2297 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2298 SSL_R_DATA_LENGTH_TOO_LONG);
2299 goto err;
2300 }
2301 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2302 {
2303 /* The premaster secret must contain the same version number as the
2304 * ClientHello to detect version rollback attacks (strangely, the
2305 * protocol does not offer such protection for DH ciphersuites).
2306 * However, buggy clients exist that send random bytes instead of
2307 * the protocol version.
2308 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2309 * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2310 */
2311 if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2312 {
2313 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2314 SSL_AD_DECODE_ERROR);
2315 goto err;
2316 }
2317 }
2318
2319 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2320
2321 s->session->master_key_length=
2322 s->method->ssl3_enc->generate_master_secret(s,
2323 s->session->master_key, pms, outl);
2324
2325 if (kssl_ctx->client_princ)
2326 {
2327 size_t len = strlen(kssl_ctx->client_princ);
2328 if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2329 {
2330 s->session->krb5_client_princ_len = len;
2331 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2332 }
2333 }
2334
2335
2336 /* Was doing kssl_ctx_free() here,
2337 ** but it caused problems for apache.
2338 ** kssl_ctx = kssl_ctx_free(kssl_ctx);
2339 ** if (s->kssl_ctx) s->kssl_ctx = NULL;
2340 */
2341 }
2342 else
2343 #endif /* OPENSSL_NO_KRB5 */
2344
2345 #ifndef OPENSSL_NO_ECDH
2346 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2347 {
2348 int ret = 1;
2349 int field_size = 0;
2350 const EC_KEY *tkey;
2351 const EC_GROUP *group;
2352 const BIGNUM *priv_key;
2353
2354 /* initialize structures for server's ECDH key pair */
2355 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2356 {
2357 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2358 ERR_R_MALLOC_FAILURE);
2359 goto err;
2360 }
2361
2362 /* Let's get server private key and group information */
2363 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2364 {
2365 /* use the certificate */
2366 tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2367 }
2368 else
2369 {
2370 /* use the ephermeral values we saved when
2371 * generating the ServerKeyExchange msg.
2372 */
2373 tkey = s->s3->tmp.ecdh;
2374 }
2375
2376 group = EC_KEY_get0_group(tkey);
2377 priv_key = EC_KEY_get0_private_key(tkey);
2378
2379 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2380 !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2381 {
2382 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2383 ERR_R_EC_LIB);
2384 goto err;
2385 }
2386
2387 /* Let's get client's public key */
2388 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2389 {
2390 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2391 ERR_R_MALLOC_FAILURE);
2392 goto err;
2393 }
2394
2395 if (n == 0L)
2396 {
2397 /* Client Publickey was in Client Certificate */
2398
2399 if (alg_k & SSL_kEECDH)
2400 {
2401 al=SSL_AD_HANDSHAKE_FAILURE;
2402 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2403 goto f_err;
2404 }
2405 if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2406 == NULL) ||
2407 (clnt_pub_pkey->type != EVP_PKEY_EC))
2408 {
2409 /* XXX: For now, we do not support client
2410 * authentication using ECDH certificates
2411 * so this branch (n == 0L) of the code is
2412 * never executed. When that support is
2413 * added, we ought to ensure the key
2414 * received in the certificate is
2415 * authorized for key agreement.
2416 * ECDH_compute_key implicitly checks that
2417 * the two ECDH shares are for the same
2418 * group.
2419 */
2420 al=SSL_AD_HANDSHAKE_FAILURE;
2421 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2422 SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2423 goto f_err;
2424 }
2425
2426 if (EC_POINT_copy(clnt_ecpoint,
2427 EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2428 {
2429 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2430 ERR_R_EC_LIB);
2431 goto err;
2432 }
2433 ret = 2; /* Skip certificate verify processing */
2434 }
2435 else
2436 {
2437 /* Get client's public key from encoded point
2438 * in the ClientKeyExchange message.
2439 */
2440 if ((bn_ctx = BN_CTX_new()) == NULL)
2441 {
2442 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2443 ERR_R_MALLOC_FAILURE);
2444 goto err;
2445 }
2446
2447 /* Get encoded point length */
2448 i = *p;
2449 p += 1;
2450 if (EC_POINT_oct2point(group,
2451 clnt_ecpoint, p, i, bn_ctx) == 0)
2452 {
2453 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2454 ERR_R_EC_LIB);
2455 goto err;
2456 }
2457 /* p is pointing to somewhere in the buffer
2458 * currently, so set it to the start
2459 */
2460 p=(unsigned char *)s->init_buf->data;
2461 }
2462
2463 /* Compute the shared pre-master secret */
2464 field_size = EC_GROUP_get_degree(group);
2465 if (field_size <= 0)
2466 {
2467 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2468 ERR_R_ECDH_LIB);
2469 goto err;
2470 }
2471 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2472 if (i <= 0)
2473 {
2474 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2475 ERR_R_ECDH_LIB);
2476 goto err;
2477 }
2478
2479 EVP_PKEY_free(clnt_pub_pkey);
2480 EC_POINT_free(clnt_ecpoint);
2481 EC_KEY_free(srvr_ecdh);
2482 BN_CTX_free(bn_ctx);
2483 EC_KEY_free(s->s3->tmp.ecdh);
2484 s->s3->tmp.ecdh = NULL;
2485
2486 /* Compute the master secret */
2487 s->session->master_key_length = s->method->ssl3_enc-> \
2488 generate_master_secret(s, s->session->master_key, p, i);
2489
2490 OPENSSL_cleanse(p, i);
2491 return (ret);
2492 }
2493 else
2494 #endif
2495 #ifndef OPENSSL_NO_PSK
2496 if (alg_k & SSL_kPSK)
2497 {
2498 unsigned char *t = NULL;
2499 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2500 unsigned int pre_ms_len = 0, psk_len = 0;
2501 int psk_err = 1;
2502 char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2503
2504 al=SSL_AD_HANDSHAKE_FAILURE;
2505
2506 n2s(p,i);
2507 if (n != i+2)
2508 {
2509 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2510 SSL_R_LENGTH_MISMATCH);
2511 goto psk_err;
2512 }
2513 if (i > PSK_MAX_IDENTITY_LEN)
2514 {
2515 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2516 SSL_R_DATA_LENGTH_TOO_LONG);
2517 goto psk_err;
2518 }
2519 if (s->psk_server_callback == NULL)
2520 {
2521 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2522 SSL_R_PSK_NO_SERVER_CB);
2523 goto psk_err;
2524 }
2525
2526 /* Create guaranteed NULL-terminated identity
2527 * string for the callback */
2528 memcpy(tmp_id, p, i);
2529 memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2530 psk_len = s->psk_server_callback(s, tmp_id,
2531 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2532 OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2533
2534 if (psk_len > PSK_MAX_PSK_LEN)
2535 {
2536 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2537 ERR_R_INTERNAL_ERROR);
2538 goto psk_err;
2539 }
2540 else if (psk_len == 0)
2541 {
2542 /* PSK related to the given identity not found */
2543 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2544 SSL_R_PSK_IDENTITY_NOT_FOUND);
2545 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2546 goto psk_err;
2547 }
2548
2549 /* create PSK pre_master_secret */
2550 pre_ms_len=2+psk_len+2+psk_len;
2551 t = psk_or_pre_ms;
2552 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2553 s2n(psk_len, t);
2554 memset(t, 0, psk_len);
2555 t+=psk_len;
2556 s2n(psk_len, t);
2557
2558 if (s->session->psk_identity != NULL)
2559 OPENSSL_free(s->session->psk_identity);
2560 s->session->psk_identity = BUF_strdup((char *)p);
2561 if (s->session->psk_identity == NULL)
2562 {
2563 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2564 ERR_R_MALLOC_FAILURE);
2565 goto psk_err;
2566 }
2567
2568 if (s->session->psk_identity_hint != NULL)
2569 OPENSSL_free(s->session->psk_identity_hint);
2570 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2571 if (s->ctx->psk_identity_hint != NULL &&
2572 s->session->psk_identity_hint == NULL)
2573 {
2574 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2575 ERR_R_MALLOC_FAILURE);
2576 goto psk_err;
2577 }
2578
2579 s->session->master_key_length=
2580 s->method->ssl3_enc->generate_master_secret(s,
2581 s->session->master_key, psk_or_pre_ms, pre_ms_len);
2582 psk_err = 0;
2583 psk_err:
2584 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2585 if (psk_err != 0)
2586 goto f_err;
2587 }
2588 else
2589 #endif
2590 if (alg_k & SSL_kGOST)
2591 {
2592 int ret = 0;
2593 EVP_PKEY_CTX *pkey_ctx;
2594 EVP_PKEY *client_pub_pkey = NULL;
2595 unsigned char premaster_secret[32], *start;
2596 size_t outlen=32, inlen;
2597
2598 /* Get our certificate private key*/
2599 pkey_ctx = EVP_PKEY_CTX_new(s->cert->key->privatekey,NULL);
2600 EVP_PKEY_decrypt_init(pkey_ctx);
2601 /* If client certificate is present and is of the same type, maybe
2602 * use it for key exchange. Don't mind errors from
2603 * EVP_PKEY_derive_set_peer, because it is completely valid to use
2604 * a client certificate for authorization only. */
2605 client_pub_pkey = X509_get_pubkey(s->session->peer);
2606 if (client_pub_pkey)
2607 {
2608 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2609 ERR_clear_error();
2610 }
2611 /* Decrypt session key */
2612 if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2613 {
2614 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2615 goto gerr;
2616 }
2617 if (p[1] == 0x81)
2618 {
2619 start = p+3;
2620 inlen = p[2];
2621 }
2622 else if (p[1] < 0x80)
2623 {
2624 start = p+2;
2625 inlen = p[1];
2626 }
2627 else
2628 {
2629 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2630 goto gerr;
2631 }
2632 if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2633
2634 {
2635 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2636 goto gerr;
2637 }
2638 /* Generate master secret */
2639 s->session->master_key_length=
2640 s->method->ssl3_enc->generate_master_secret(s,
2641 s->session->master_key,premaster_secret,32);
2642 /* Check if pubkey from client certificate was used */
2643 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2644 ret = 2;
2645 else
2646 ret = 1;
2647 gerr:
2648 EVP_PKEY_free(client_pub_pkey);
2649 EVP_PKEY_CTX_free(pkey_ctx);
2650 if (ret)
2651 return ret;
2652 else
2653 goto err;
2654 }
2655 else
2656 {
2657 al=SSL_AD_HANDSHAKE_FAILURE;
2658 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2659 SSL_R_UNKNOWN_CIPHER_TYPE);
2660 goto f_err;
2661 }
2662
2663 return(1);
2664 f_err:
2665 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2666 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2667 err:
2668 #endif
2669 #ifndef OPENSSL_NO_ECDH
2670 EVP_PKEY_free(clnt_pub_pkey);
2671 EC_POINT_free(clnt_ecpoint);
2672 if (srvr_ecdh != NULL)
2673 EC_KEY_free(srvr_ecdh);
2674 BN_CTX_free(bn_ctx);
2675 #endif
2676 return(-1);
2677 }
2678
ssl3_get_cert_verify(SSL * s)2679 int ssl3_get_cert_verify(SSL *s)
2680 {
2681 EVP_PKEY *pkey=NULL;
2682 unsigned char *p;
2683 int al,ok,ret=0;
2684 long n;
2685 int type=0,i,j;
2686 X509 *peer;
2687
2688 n=s->method->ssl_get_message(s,
2689 SSL3_ST_SR_CERT_VRFY_A,
2690 SSL3_ST_SR_CERT_VRFY_B,
2691 -1,
2692 514, /* 514? */
2693 &ok);
2694
2695 if (!ok) return((int)n);
2696
2697 if (s->session->peer != NULL)
2698 {
2699 peer=s->session->peer;
2700 pkey=X509_get_pubkey(peer);
2701 type=X509_certificate_type(peer,pkey);
2702 }
2703 else
2704 {
2705 peer=NULL;
2706 pkey=NULL;
2707 }
2708
2709 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2710 {
2711 s->s3->tmp.reuse_message=1;
2712 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2713 {
2714 al=SSL_AD_UNEXPECTED_MESSAGE;
2715 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2716 goto f_err;
2717 }
2718 ret=1;
2719 goto end;
2720 }
2721
2722 if (peer == NULL)
2723 {
2724 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2725 al=SSL_AD_UNEXPECTED_MESSAGE;
2726 goto f_err;
2727 }
2728
2729 if (!(type & EVP_PKT_SIGN))
2730 {
2731 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2732 al=SSL_AD_ILLEGAL_PARAMETER;
2733 goto f_err;
2734 }
2735
2736 if (s->s3->change_cipher_spec)
2737 {
2738 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2739 al=SSL_AD_UNEXPECTED_MESSAGE;
2740 goto f_err;
2741 }
2742
2743 /* we now have a signature that we need to verify */
2744 p=(unsigned char *)s->init_msg;
2745 /* Check for broken implementations of GOST ciphersuites */
2746 /* If key is GOST and n is exactly 64, it is bare
2747 * signature without length field */
2748 if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2749 pkey->type == NID_id_GostR3410_2001) )
2750 {
2751 i=64;
2752 }
2753 else
2754 {
2755 n2s(p,i);
2756 n-=2;
2757 if (i > n)
2758 {
2759 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2760 al=SSL_AD_DECODE_ERROR;
2761 goto f_err;
2762 }
2763 }
2764 j=EVP_PKEY_size(pkey);
2765 if ((i > j) || (n > j) || (n <= 0))
2766 {
2767 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2768 al=SSL_AD_DECODE_ERROR;
2769 goto f_err;
2770 }
2771
2772 #ifndef OPENSSL_NO_RSA
2773 if (pkey->type == EVP_PKEY_RSA)
2774 {
2775 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2776 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2777 pkey->pkey.rsa);
2778 if (i < 0)
2779 {
2780 al=SSL_AD_DECRYPT_ERROR;
2781 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2782 goto f_err;
2783 }
2784 if (i == 0)
2785 {
2786 al=SSL_AD_DECRYPT_ERROR;
2787 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2788 goto f_err;
2789 }
2790 }
2791 else
2792 #endif
2793 #ifndef OPENSSL_NO_DSA
2794 if (pkey->type == EVP_PKEY_DSA)
2795 {
2796 j=DSA_verify(pkey->save_type,
2797 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2798 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2799 if (j <= 0)
2800 {
2801 /* bad signature */
2802 al=SSL_AD_DECRYPT_ERROR;
2803 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2804 goto f_err;
2805 }
2806 }
2807 else
2808 #endif
2809 #ifndef OPENSSL_NO_ECDSA
2810 if (pkey->type == EVP_PKEY_EC)
2811 {
2812 j=ECDSA_verify(pkey->save_type,
2813 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2814 SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2815 if (j <= 0)
2816 {
2817 /* bad signature */
2818 al=SSL_AD_DECRYPT_ERROR;
2819 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2820 SSL_R_BAD_ECDSA_SIGNATURE);
2821 goto f_err;
2822 }
2823 }
2824 else
2825 #endif
2826 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2827 { unsigned char signature[64];
2828 int idx;
2829 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2830 EVP_PKEY_verify_init(pctx);
2831 if (i!=64) {
2832 fprintf(stderr,"GOST signature length is %d",i);
2833 }
2834 for (idx=0;idx<64;idx++) {
2835 signature[63-idx]=p[idx];
2836 }
2837 j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2838 EVP_PKEY_CTX_free(pctx);
2839 if (j<=0)
2840 {
2841 al=SSL_AD_DECRYPT_ERROR;
2842 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2843 SSL_R_BAD_ECDSA_SIGNATURE);
2844 goto f_err;
2845 }
2846 }
2847 else
2848 {
2849 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2850 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2851 goto f_err;
2852 }
2853
2854
2855 ret=1;
2856 if (0)
2857 {
2858 f_err:
2859 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2860 }
2861 end:
2862 EVP_PKEY_free(pkey);
2863 return(ret);
2864 }
2865
ssl3_get_client_certificate(SSL * s)2866 int ssl3_get_client_certificate(SSL *s)
2867 {
2868 int i,ok,al,ret= -1;
2869 X509 *x=NULL;
2870 unsigned long l,nc,llen,n;
2871 const unsigned char *p,*q;
2872 unsigned char *d;
2873 STACK_OF(X509) *sk=NULL;
2874
2875 n=s->method->ssl_get_message(s,
2876 SSL3_ST_SR_CERT_A,
2877 SSL3_ST_SR_CERT_B,
2878 -1,
2879 s->max_cert_list,
2880 &ok);
2881
2882 if (!ok) return((int)n);
2883
2884 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2885 {
2886 if ( (s->verify_mode & SSL_VERIFY_PEER) &&
2887 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2888 {
2889 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2890 al=SSL_AD_HANDSHAKE_FAILURE;
2891 goto f_err;
2892 }
2893 /* If tls asked for a client cert, the client must return a 0 list */
2894 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2895 {
2896 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2897 al=SSL_AD_UNEXPECTED_MESSAGE;
2898 goto f_err;
2899 }
2900 s->s3->tmp.reuse_message=1;
2901 return(1);
2902 }
2903
2904 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2905 {
2906 al=SSL_AD_UNEXPECTED_MESSAGE;
2907 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2908 goto f_err;
2909 }
2910 p=d=(unsigned char *)s->init_msg;
2911
2912 if ((sk=sk_X509_new_null()) == NULL)
2913 {
2914 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2915 goto err;
2916 }
2917
2918 n2l3(p,llen);
2919 if (llen+3 != n)
2920 {
2921 al=SSL_AD_DECODE_ERROR;
2922 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2923 goto f_err;
2924 }
2925 for (nc=0; nc<llen; )
2926 {
2927 n2l3(p,l);
2928 if ((l+nc+3) > llen)
2929 {
2930 al=SSL_AD_DECODE_ERROR;
2931 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2932 goto f_err;
2933 }
2934
2935 q=p;
2936 x=d2i_X509(NULL,&p,l);
2937 if (x == NULL)
2938 {
2939 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2940 goto err;
2941 }
2942 if (p != (q+l))
2943 {
2944 al=SSL_AD_DECODE_ERROR;
2945 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2946 goto f_err;
2947 }
2948 if (!sk_X509_push(sk,x))
2949 {
2950 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2951 goto err;
2952 }
2953 x=NULL;
2954 nc+=l+3;
2955 }
2956
2957 if (sk_X509_num(sk) <= 0)
2958 {
2959 /* TLS does not mind 0 certs returned */
2960 if (s->version == SSL3_VERSION)
2961 {
2962 al=SSL_AD_HANDSHAKE_FAILURE;
2963 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2964 goto f_err;
2965 }
2966 /* Fail for TLS only if we required a certificate */
2967 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2968 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2969 {
2970 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2971 al=SSL_AD_HANDSHAKE_FAILURE;
2972 goto f_err;
2973 }
2974 }
2975 else
2976 {
2977 i=ssl_verify_cert_chain(s,sk);
2978 if (i <= 0)
2979 {
2980 al=ssl_verify_alarm_type(s->verify_result);
2981 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2982 goto f_err;
2983 }
2984 }
2985
2986 if (s->session->peer != NULL) /* This should not be needed */
2987 X509_free(s->session->peer);
2988 s->session->peer=sk_X509_shift(sk);
2989 s->session->verify_result = s->verify_result;
2990
2991 /* With the current implementation, sess_cert will always be NULL
2992 * when we arrive here. */
2993 if (s->session->sess_cert == NULL)
2994 {
2995 s->session->sess_cert = ssl_sess_cert_new();
2996 if (s->session->sess_cert == NULL)
2997 {
2998 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2999 goto err;
3000 }
3001 }
3002 if (s->session->sess_cert->cert_chain != NULL)
3003 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3004 s->session->sess_cert->cert_chain=sk;
3005 /* Inconsistency alert: cert_chain does *not* include the
3006 * peer's own certificate, while we do include it in s3_clnt.c */
3007
3008 sk=NULL;
3009
3010 ret=1;
3011 if (0)
3012 {
3013 f_err:
3014 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3015 }
3016 err:
3017 if (x != NULL) X509_free(x);
3018 if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3019 return(ret);
3020 }
3021
ssl3_send_server_certificate(SSL * s)3022 int ssl3_send_server_certificate(SSL *s)
3023 {
3024 unsigned long l;
3025 X509 *x;
3026
3027 if (s->state == SSL3_ST_SW_CERT_A)
3028 {
3029 x=ssl_get_server_send_cert(s);
3030 if (x == NULL)
3031 {
3032 /* VRS: allow null cert if auth == KRB5 */
3033 if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3034 (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3035 {
3036 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3037 return(0);
3038 }
3039 }
3040
3041 l=ssl3_output_cert_chain(s,x);
3042 s->state=SSL3_ST_SW_CERT_B;
3043 s->init_num=(int)l;
3044 s->init_off=0;
3045 }
3046
3047 /* SSL3_ST_SW_CERT_B */
3048 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3049 }
3050 #ifndef OPENSSL_NO_TLSEXT
ssl3_send_newsession_ticket(SSL * s)3051 int ssl3_send_newsession_ticket(SSL *s)
3052 {
3053 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3054 {
3055 unsigned char *p, *senc, *macstart;
3056 int len, slen;
3057 unsigned int hlen;
3058 EVP_CIPHER_CTX ctx;
3059 HMAC_CTX hctx;
3060 SSL_CTX *tctx = s->initial_ctx;
3061 unsigned char iv[EVP_MAX_IV_LENGTH];
3062 unsigned char key_name[16];
3063
3064 /* get session encoding length */
3065 slen = i2d_SSL_SESSION(s->session, NULL);
3066 /* Some length values are 16 bits, so forget it if session is
3067 * too long
3068 */
3069 if (slen > 0xFF00)
3070 return -1;
3071 /* Grow buffer if need be: the length calculation is as
3072 * follows 1 (size of message name) + 3 (message length
3073 * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3074 * 16 (key name) + max_iv_len (iv length) +
3075 * session_length + max_enc_block_size (max encrypted session
3076 * length) + max_md_size (HMAC).
3077 */
3078 if (!BUF_MEM_grow(s->init_buf,
3079 26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3080 EVP_MAX_MD_SIZE + slen))
3081 return -1;
3082 senc = OPENSSL_malloc(slen);
3083 if (!senc)
3084 return -1;
3085 p = senc;
3086 i2d_SSL_SESSION(s->session, &p);
3087
3088 p=(unsigned char *)s->init_buf->data;
3089 /* do the header */
3090 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3091 /* Skip message length for now */
3092 p += 3;
3093 EVP_CIPHER_CTX_init(&ctx);
3094 HMAC_CTX_init(&hctx);
3095 /* Initialize HMAC and cipher contexts. If callback present
3096 * it does all the work otherwise use generated values
3097 * from parent ctx.
3098 */
3099 if (tctx->tlsext_ticket_key_cb)
3100 {
3101 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3102 &hctx, 1) < 0)
3103 {
3104 OPENSSL_free(senc);
3105 return -1;
3106 }
3107 }
3108 else
3109 {
3110 RAND_pseudo_bytes(iv, 16);
3111 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3112 tctx->tlsext_tick_aes_key, iv);
3113 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3114 tlsext_tick_md(), NULL);
3115 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3116 }
3117 l2n(s->session->tlsext_tick_lifetime_hint, p);
3118 /* Skip ticket length for now */
3119 p += 2;
3120 /* Output key name */
3121 macstart = p;
3122 memcpy(p, key_name, 16);
3123 p += 16;
3124 /* output IV */
3125 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3126 p += EVP_CIPHER_CTX_iv_length(&ctx);
3127 /* Encrypt session data */
3128 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3129 p += len;
3130 EVP_EncryptFinal(&ctx, p, &len);
3131 p += len;
3132 EVP_CIPHER_CTX_cleanup(&ctx);
3133
3134 HMAC_Update(&hctx, macstart, p - macstart);
3135 HMAC_Final(&hctx, p, &hlen);
3136 HMAC_CTX_cleanup(&hctx);
3137
3138 p += hlen;
3139 /* Now write out lengths: p points to end of data written */
3140 /* Total length */
3141 len = p - (unsigned char *)s->init_buf->data;
3142 p=(unsigned char *)s->init_buf->data + 1;
3143 l2n3(len - 4, p); /* Message length */
3144 p += 4;
3145 s2n(len - 10, p); /* Ticket length */
3146
3147 /* number of bytes to write */
3148 s->init_num= len;
3149 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3150 s->init_off=0;
3151 OPENSSL_free(senc);
3152 }
3153
3154 /* SSL3_ST_SW_SESSION_TICKET_B */
3155 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3156 }
3157
ssl3_send_cert_status(SSL * s)3158 int ssl3_send_cert_status(SSL *s)
3159 {
3160 if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3161 {
3162 unsigned char *p;
3163 /* Grow buffer if need be: the length calculation is as
3164 * follows 1 (message type) + 3 (message length) +
3165 * 1 (ocsp response type) + 3 (ocsp response length)
3166 * + (ocsp response)
3167 */
3168 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3169 return -1;
3170
3171 p=(unsigned char *)s->init_buf->data;
3172
3173 /* do the header */
3174 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3175 /* message length */
3176 l2n3(s->tlsext_ocsp_resplen + 4, p);
3177 /* status type */
3178 *(p++)= s->tlsext_status_type;
3179 /* length of OCSP response */
3180 l2n3(s->tlsext_ocsp_resplen, p);
3181 /* actual response */
3182 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3183 /* number of bytes to write */
3184 s->init_num = 8 + s->tlsext_ocsp_resplen;
3185 s->state=SSL3_ST_SW_CERT_STATUS_B;
3186 s->init_off = 0;
3187 }
3188
3189 /* SSL3_ST_SW_CERT_STATUS_B */
3190 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3191 }
3192 #endif
3193