d5e79dfbe94b1b944eb9218c63ad07d6af9a8f2b
[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) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #include <stdio.h>
152 #include "ssl_locl.h"
153 #include "kssl_lcl.h"
154 #include <openssl/buffer.h>
155 #include <openssl/rand.h>
156 #include <openssl/objects.h>
157 #include <openssl/evp.h>
158 #include <openssl/md5.h>
159 #ifdef OPENSSL_FIPS
160 #include <openssl/fips.h>
161 #endif
162 #ifndef OPENSSL_NO_DH
163 #include <openssl/dh.h>
164 #endif
165 #include <openssl/bn.h>
166 #ifndef OPENSSL_NO_ENGINE
167 #include <openssl/engine.h>
168 #endif
169
170 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
171
172 #ifndef OPENSSL_NO_SSL3_METHOD
173 static const SSL_METHOD *ssl3_get_client_method(int ver)
174         {
175         if (ver == SSL3_VERSION)
176                 return(SSLv3_client_method());
177         else
178                 return(NULL);
179         }
180
181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
182                         ssl_undefined_function,
183                         ssl3_connect,
184                         ssl3_get_client_method)
185 #endif
186
187 int ssl3_connect(SSL *s)
188         {
189         BUF_MEM *buf=NULL;
190         unsigned long 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         s->in_handshake++;
205         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
206
207 #ifndef OPENSSL_NO_HEARTBEATS
208         /* If we're awaiting a HeartbeatResponse, pretend we
209          * already got and don't await it anymore, because
210          * Heartbeats don't make sense during handshakes anyway.
211          */
212         if (s->tlsext_hb_pending)
213                 {
214                 s->tlsext_hb_pending = 0;
215                 s->tlsext_hb_seq++;
216                 }
217 #endif
218
219         for (;;)
220                 {
221                 state=s->state;
222
223                 switch(s->state)
224                         {
225                 case SSL_ST_RENEGOTIATE:
226                         s->renegotiate=1;
227                         s->state=SSL_ST_CONNECT;
228                         s->ctx->stats.sess_connect_renegotiate++;
229                         /* break */
230                 case SSL_ST_BEFORE:
231                 case SSL_ST_CONNECT:
232                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
233                 case SSL_ST_OK|SSL_ST_CONNECT:
234
235                         s->server=0;
236                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
237
238                         if ((s->version & 0xff00 ) != 0x0300)
239                                 {
240                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
241                                 ret = -1;
242                                 goto end;
243                                 }
244
245                         if (!ssl_security(s, SSL_SECOP_VERSION, 0,
246                                                         s->version, NULL))
247                                 {
248                                 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
249                                 return -1;
250                                 }
251                                 
252                         /* s->version=SSL3_VERSION; */
253                         s->type=SSL_ST_CONNECT;
254
255                         if (s->init_buf == NULL)
256                                 {
257                                 if ((buf=BUF_MEM_new()) == NULL)
258                                         {
259                                         ret= -1;
260                                         goto end;
261                                         }
262                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
263                                         {
264                                         ret= -1;
265                                         goto end;
266                                         }
267                                 s->init_buf=buf;
268                                 buf=NULL;
269                                 }
270
271                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
272
273                         /* setup buffing BIO */
274                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
275
276                         /* don't push the buffering BIO quite yet */
277
278                         ssl3_init_finished_mac(s);
279
280                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
281                         s->ctx->stats.sess_connect++;
282                         s->init_num=0;
283                         break;
284
285                 case SSL3_ST_CW_CLNT_HELLO_A:
286                 case SSL3_ST_CW_CLNT_HELLO_B:
287
288                         s->shutdown=0;
289                         ret=ssl3_client_hello(s);
290                         if (ret <= 0) goto end;
291                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
292                         s->init_num=0;
293
294                         /* turn on buffering for the next lot of output */
295                         if (s->bbio != s->wbio)
296                                 s->wbio=BIO_push(s->bbio,s->wbio);
297
298                         break;
299
300                 case SSL3_ST_CR_SRVR_HELLO_A:
301                 case SSL3_ST_CR_SRVR_HELLO_B:
302                         ret=ssl3_get_server_hello(s);
303                         if (ret <= 0) goto end;
304
305                         if (s->hit)
306                                 {
307                                 s->state=SSL3_ST_CR_FINISHED_A;
308 #ifndef OPENSSL_NO_TLSEXT
309                                 if (s->tlsext_ticket_expected)
310                                         {
311                                         /* receive renewed session ticket */
312                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
313                                         }
314 #endif
315                                 }
316                         else
317                                 {
318                                         s->state=SSL3_ST_CR_CERT_A;
319                                 }
320                         s->init_num=0;
321                         break;
322                 case SSL3_ST_CR_CERT_A:
323                 case SSL3_ST_CR_CERT_B:
324                         /* Check if it is anon DH/ECDH, SRP auth */
325                         /* or PSK */
326                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) &&
327                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
328                                 {
329                                 ret=ssl3_get_server_certificate(s);
330                                 if (ret <= 0) goto end;
331 #ifndef OPENSSL_NO_TLSEXT
332                                 if (s->tlsext_status_expected)
333                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
334                                 else
335                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
336                                 }
337                         else
338                                 {
339                                 skip = 1;
340                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
341                                 }
342 #else
343                                 }
344                         else
345                                 skip=1;
346
347                         s->state=SSL3_ST_CR_KEY_EXCH_A;
348 #endif
349                         s->init_num=0;
350                         break;
351
352                 case SSL3_ST_CR_KEY_EXCH_A:
353                 case SSL3_ST_CR_KEY_EXCH_B:
354                         ret=ssl3_get_key_exchange(s);
355                         if (ret <= 0) goto end;
356                         s->state=SSL3_ST_CR_CERT_REQ_A;
357                         s->init_num=0;
358
359                         /* at this point we check that we have the
360                          * required stuff from the server */
361                         if (!ssl3_check_cert_and_algorithm(s))
362                                 {
363                                 ret= -1;
364                                 goto end;
365                                 }
366                         break;
367
368                 case SSL3_ST_CR_CERT_REQ_A:
369                 case SSL3_ST_CR_CERT_REQ_B:
370                         ret=ssl3_get_certificate_request(s);
371                         if (ret <= 0) goto end;
372                         s->state=SSL3_ST_CR_SRVR_DONE_A;
373                         s->init_num=0;
374                         break;
375
376                 case SSL3_ST_CR_SRVR_DONE_A:
377                 case SSL3_ST_CR_SRVR_DONE_B:
378                         ret=ssl3_get_server_done(s);
379                         if (ret <= 0) goto end;
380 #ifndef OPENSSL_NO_SRP
381                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
382                                 {
383                                 if ((ret = SRP_Calc_A_param(s))<=0)
384                                         {
385                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
386                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
387                                         goto end;
388                                         }
389                                 }
390 #endif
391                         if (s->s3->tmp.cert_req)
392                                 s->state=SSL3_ST_CW_CERT_A;
393                         else
394                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
395                         s->init_num=0;
396
397                         break;
398
399                 case SSL3_ST_CW_CERT_A:
400                 case SSL3_ST_CW_CERT_B:
401                 case SSL3_ST_CW_CERT_C:
402                 case SSL3_ST_CW_CERT_D:
403                         ret=ssl3_send_client_certificate(s);
404                         if (ret <= 0) goto end;
405                         s->state=SSL3_ST_CW_KEY_EXCH_A;
406                         s->init_num=0;
407                         break;
408
409                 case SSL3_ST_CW_KEY_EXCH_A:
410                 case SSL3_ST_CW_KEY_EXCH_B:
411                         ret=ssl3_send_client_key_exchange(s);
412                         if (ret <= 0) goto end;
413                         /* EAY EAY EAY need to check for DH fix cert
414                          * sent back */
415                         /* For TLS, cert_req is set to 2, so a cert chain
416                          * of nothing is sent, but no verify packet is sent */
417                         /* XXX: For now, we do not support client 
418                          * authentication in ECDH cipher suites with
419                          * ECDH (rather than ECDSA) certificates.
420                          * We need to skip the certificate verify 
421                          * message when client's ECDH public key is sent 
422                          * inside the client certificate.
423                          */
424                         if (s->s3->tmp.cert_req == 1)
425                                 {
426                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
427                                 }
428                         else
429                                 {
430                                 s->state=SSL3_ST_CW_CHANGE_A;
431                                 s->s3->change_cipher_spec=0;
432                                 }
433                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
434                                 {
435                                 s->state=SSL3_ST_CW_CHANGE_A;
436                                 s->s3->change_cipher_spec=0;
437                                 }
438
439                         s->init_num=0;
440                         break;
441
442                 case SSL3_ST_CW_CERT_VRFY_A:
443                 case SSL3_ST_CW_CERT_VRFY_B:
444                         ret=ssl3_send_client_verify(s);
445                         if (ret <= 0) goto end;
446                         s->state=SSL3_ST_CW_CHANGE_A;
447                         s->init_num=0;
448                         s->s3->change_cipher_spec=0;
449                         break;
450
451                 case SSL3_ST_CW_CHANGE_A:
452                 case SSL3_ST_CW_CHANGE_B:
453                         ret=ssl3_send_change_cipher_spec(s,
454                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
455                         if (ret <= 0) goto end;
456
457 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
458                         s->state=SSL3_ST_CW_FINISHED_A;
459 #else
460                         if (s->s3->next_proto_neg_seen)
461                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
462                         else
463                                 s->state=SSL3_ST_CW_FINISHED_A;
464 #endif
465                         s->init_num=0;
466
467                         s->session->cipher=s->s3->tmp.new_cipher;
468 #ifdef OPENSSL_NO_COMP
469                         s->session->compress_meth=0;
470 #else
471                         if (s->s3->tmp.new_compression == NULL)
472                                 s->session->compress_meth=0;
473                         else
474                                 s->session->compress_meth=
475                                         s->s3->tmp.new_compression->id;
476 #endif
477                         if (!s->method->ssl3_enc->setup_key_block(s))
478                                 {
479                                 ret= -1;
480                                 goto end;
481                                 }
482
483                         if (!s->method->ssl3_enc->change_cipher_state(s,
484                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
485                                 {
486                                 ret= -1;
487                                 goto end;
488                                 }
489
490                         break;
491
492 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
493                 case SSL3_ST_CW_NEXT_PROTO_A:
494                 case SSL3_ST_CW_NEXT_PROTO_B:
495                         ret=ssl3_send_next_proto(s);
496                         if (ret <= 0) goto end;
497                         s->state=SSL3_ST_CW_FINISHED_A;
498                         break;
499 #endif
500
501                 case SSL3_ST_CW_FINISHED_A:
502                 case SSL3_ST_CW_FINISHED_B:
503                         ret=ssl3_send_finished(s,
504                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
505                                 s->method->ssl3_enc->client_finished_label,
506                                 s->method->ssl3_enc->client_finished_label_len);
507                         if (ret <= 0) goto end;
508                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
509                         s->state=SSL3_ST_CW_FLUSH;
510
511                         /* clear flags */
512                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
513                         if (s->hit)
514                                 {
515                                 s->s3->tmp.next_state=SSL_ST_OK;
516                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
517                                         {
518                                         s->state=SSL_ST_OK;
519                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
520                                         s->s3->delay_buf_pop_ret=0;
521                                         }
522                                 }
523                         else
524                                 {
525 #ifndef OPENSSL_NO_TLSEXT
526                                 /* Allow NewSessionTicket if ticket expected */
527                                 if (s->tlsext_ticket_expected)
528                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
529                                 else
530 #endif
531                                 
532                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
533                                 }
534                         s->init_num=0;
535                         break;
536
537 #ifndef OPENSSL_NO_TLSEXT
538                 case SSL3_ST_CR_SESSION_TICKET_A:
539                 case SSL3_ST_CR_SESSION_TICKET_B:
540                         ret=ssl3_get_new_session_ticket(s);
541                         if (ret <= 0) goto end;
542                         s->state=SSL3_ST_CR_FINISHED_A;
543                         s->init_num=0;
544                 break;
545
546                 case SSL3_ST_CR_CERT_STATUS_A:
547                 case SSL3_ST_CR_CERT_STATUS_B:
548                         ret=ssl3_get_cert_status(s);
549                         if (ret <= 0) goto end;
550                         s->state=SSL3_ST_CR_KEY_EXCH_A;
551                         s->init_num=0;
552                 break;
553 #endif
554
555                 case SSL3_ST_CR_FINISHED_A:
556                 case SSL3_ST_CR_FINISHED_B:
557
558                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
559                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
560                                 SSL3_ST_CR_FINISHED_B);
561                         if (ret <= 0) goto end;
562
563                         if (s->hit)
564                                 s->state=SSL3_ST_CW_CHANGE_A;
565                         else
566                                 s->state=SSL_ST_OK;
567                         s->init_num=0;
568                         break;
569
570                 case SSL3_ST_CW_FLUSH:
571                         s->rwstate=SSL_WRITING;
572                         if (BIO_flush(s->wbio) <= 0)
573                                 {
574                                 ret= -1;
575                                 goto end;
576                                 }
577                         s->rwstate=SSL_NOTHING;
578                         s->state=s->s3->tmp.next_state;
579                         break;
580
581                 case SSL_ST_OK:
582                         /* clean a few things up */
583                         ssl3_cleanup_key_block(s);
584
585                         if (s->init_buf != NULL)
586                                 {
587                                 BUF_MEM_free(s->init_buf);
588                                 s->init_buf=NULL;
589                                 }
590
591                         /* If we are not 'joining' the last two packets,
592                          * remove the buffering now */
593                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
594                                 ssl_free_wbio_buffer(s);
595                         /* else do it later in ssl3_write */
596
597                         s->init_num=0;
598                         s->renegotiate=0;
599                         s->new_session=0;
600
601                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
602                         if (s->hit) s->ctx->stats.sess_hit++;
603
604                         ret=1;
605                         /* s->server=0; */
606                         s->handshake_func=ssl3_connect;
607                         s->ctx->stats.sess_connect_good++;
608
609                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
610
611                         goto end;
612                         /* break; */
613                         
614                 default:
615                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
616                         ret= -1;
617                         goto end;
618                         /* break; */
619                         }
620
621                 /* did we do anything */
622                 if (!s->s3->tmp.reuse_message && !skip)
623                         {
624                         if (s->debug)
625                                 {
626                                 if ((ret=BIO_flush(s->wbio)) <= 0)
627                                         goto end;
628                                 }
629
630                         if ((cb != NULL) && (s->state != state))
631                                 {
632                                 new_state=s->state;
633                                 s->state=state;
634                                 cb(s,SSL_CB_CONNECT_LOOP,1);
635                                 s->state=new_state;
636                                 }
637                         }
638                 skip=0;
639                 }
640 end:
641         s->in_handshake--;
642         if (buf != NULL)
643                 BUF_MEM_free(buf);
644         if (cb != NULL)
645                 cb(s,SSL_CB_CONNECT_EXIT,ret);
646         return(ret);
647         }
648
649
650 int ssl3_client_hello(SSL *s)
651         {
652         unsigned char *buf;
653         unsigned char *p,*d;
654         int i;
655         unsigned long l;
656         int al = 0;
657 #ifndef OPENSSL_NO_COMP
658         int j;
659         SSL_COMP *comp;
660 #endif
661
662         buf=(unsigned char *)s->init_buf->data;
663         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
664                 {
665                 SSL_SESSION *sess = s->session;
666                 if ((sess == NULL) ||
667                         (sess->ssl_version != s->version) ||
668                         !sess->session_id_length ||
669                         (sess->not_resumable))
670                         {
671                         if (!ssl_get_new_session(s,0))
672                                 goto err;
673                         }
674                 if (s->method->version == DTLS_ANY_VERSION)
675                         {
676                         /* Determine which DTLS version to use */
677                         int options = s->options;
678                         /* If DTLS 1.2 disabled correct the version number */
679                         if (options & SSL_OP_NO_DTLSv1_2)
680                                 {
681                                 if (tls1_suiteb(s))
682                                         {
683                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
684                                         goto err;
685                                         }
686                                 /* Disabling all versions is silly: return an
687                                  * error.
688                                  */
689                                 if (options & SSL_OP_NO_DTLSv1)
690                                         {
691                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
692                                         goto err;
693                                         }
694                                 /* Update method so we don't use any DTLS 1.2
695                                  * features.
696                                  */
697                                 s->method = DTLSv1_client_method();
698                                 s->version = DTLS1_VERSION;
699                                 }
700                         else
701                                 {
702                                 /* We only support one version: update method */
703                                 if (options & SSL_OP_NO_DTLSv1)
704                                         s->method = DTLSv1_2_client_method();
705                                 s->version = DTLS1_2_VERSION;
706                                 }
707                         s->client_version = s->version;
708                         }
709                 /* else use the pre-loaded session */
710
711                 p=s->s3->client_random;
712
713                 /* for DTLS if client_random is initialized, reuse it, we are
714                  * required to use same upon reply to HelloVerify */
715                 if (SSL_IS_DTLS(s))
716                         {
717                         size_t idx;
718                         i = 1;
719                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
720                                 {
721                                 if (p[idx])
722                                         {
723                                         i = 0;
724                                         break;
725                                         }
726                                 }
727                         }
728                 else 
729                         i = 1;
730
731                 if (i)
732                         ssl_fill_hello_random(s, 0, p,
733                                               sizeof(s->s3->client_random));
734
735                 /* Do the message type and length last */
736                 d=p= ssl_handshake_start(s);
737
738                 /* version indicates the negotiated version: for example from
739                  * an SSLv2/v3 compatible client hello). The client_version
740                  * field is the maximum version we permit and it is also
741                  * used in RSA encrypted premaster secrets. Some servers can
742                  * choke if we initially report a higher version then
743                  * renegotiate to a lower one in the premaster secret. This
744                  * didn't happen with TLS 1.0 as most servers supported it
745                  * but it can with TLS 1.1 or later if the server only supports
746                  * 1.0.
747                  *
748                  * Possible scenario with previous logic:
749                  *      1. Client hello indicates TLS 1.2
750                  *      2. Server hello says TLS 1.0
751                  *      3. RSA encrypted premaster secret uses 1.2.
752                  *      4. Handhaked proceeds using TLS 1.0.
753                  *      5. Server sends hello request to renegotiate.
754                  *      6. Client hello indicates TLS v1.0 as we now
755                  *         know that is maximum server supports.
756                  *      7. Server chokes on RSA encrypted premaster secret
757                  *         containing version 1.0.
758                  *
759                  * For interoperability it should be OK to always use the
760                  * maximum version we support in client hello and then rely
761                  * on the checking of version to ensure the servers isn't
762                  * being inconsistent: for example initially negotiating with
763                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
764                  * client_version in client hello and not resetting it to
765                  * the negotiated version.
766                  */
767 #if 0
768                 *(p++)=s->version>>8;
769                 *(p++)=s->version&0xff;
770                 s->client_version=s->version;
771 #else
772                 *(p++)=s->client_version>>8;
773                 *(p++)=s->client_version&0xff;
774 #endif
775
776                 /* Random stuff */
777                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
778                 p+=SSL3_RANDOM_SIZE;
779
780                 /* Session ID */
781                 if (s->new_session)
782                         i=0;
783                 else
784                         i=s->session->session_id_length;
785                 *(p++)=i;
786                 if (i != 0)
787                         {
788                         if (i > (int)sizeof(s->session->session_id))
789                                 {
790                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
791                                 goto err;
792                                 }
793                         memcpy(p,s->session->session_id,i);
794                         p+=i;
795                         }
796                 
797                 /* cookie stuff for DTLS */
798                 if (SSL_IS_DTLS(s))
799                         {
800                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
801                                 {
802                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
803                                 goto err;
804                                 }
805                         *(p++) = s->d1->cookie_len;
806                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
807                         p += s->d1->cookie_len;
808                         }
809                 
810                 /* Ciphers supported */
811                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
812                 if (i == 0)
813                         {
814                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
815                         goto err;
816                         }
817 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
818                         /* Some servers hang if client hello > 256 bytes
819                          * as hack workaround chop number of supported ciphers
820                          * to keep it well below this if we use TLS v1.2
821                          */
822                         if (TLS1_get_version(s) >= TLS1_2_VERSION
823                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
824                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
825 #endif
826                 s2n(i,p);
827                 p+=i;
828
829                 /* COMPRESSION */
830 #ifdef OPENSSL_NO_COMP
831                 *(p++)=1;
832 #else
833
834                 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
835                         j=0;
836                 else
837                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
838                 *(p++)=1+j;
839                 for (i=0; i<j; i++)
840                         {
841                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
842                         *(p++)=comp->id;
843                         }
844 #endif
845                 *(p++)=0; /* Add the NULL method */
846
847 #ifndef OPENSSL_NO_TLSEXT
848                 /* TLS extensions*/
849                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
850                         {
851                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
852                         goto err;
853                         }
854                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
855                         {
856                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
857                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
858                         goto err;
859                         }
860 #endif
861                 
862                 l= p-d;
863                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
864                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
865                 }
866
867         /* SSL3_ST_CW_CLNT_HELLO_B */
868         return ssl_do_write(s);
869 err:
870         return(-1);
871         }
872
873 int ssl3_get_server_hello(SSL *s)
874         {
875         STACK_OF(SSL_CIPHER) *sk;
876         const SSL_CIPHER *c;
877         CERT *ct = s->cert;
878         unsigned char *p,*d;
879         int i,al=SSL_AD_INTERNAL_ERROR,ok;
880         unsigned int j;
881         long n;
882 #ifndef OPENSSL_NO_COMP
883         SSL_COMP *comp;
884 #endif
885         /* Hello verify request and/or server hello version may not
886          * match so set first packet if we're negotiating version.
887          */
888         if (SSL_IS_DTLS(s))
889                 s->first_packet = 1;
890
891         n=s->method->ssl_get_message(s,
892                 SSL3_ST_CR_SRVR_HELLO_A,
893                 SSL3_ST_CR_SRVR_HELLO_B,
894                 -1,
895                 20000, /* ?? */
896                 &ok);
897
898         if (!ok) return((int)n);
899
900         if (SSL_IS_DTLS(s))
901                 {
902                 s->first_packet = 0;
903                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
904                         {
905                         if ( s->d1->send_cookie == 0)
906                                 {
907                                 s->s3->tmp.reuse_message = 1;
908                                 return 1;
909                                 }
910                         else /* already sent a cookie */
911                                 {
912                                 al=SSL_AD_UNEXPECTED_MESSAGE;
913                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
914                                 goto f_err;
915                                 }
916                         }
917                 }
918         
919         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
920                 {
921                 al=SSL_AD_UNEXPECTED_MESSAGE;
922                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
923                 goto f_err;
924                 }
925
926         d=p=(unsigned char *)s->init_msg;
927         if (s->method->version == DTLS_ANY_VERSION)
928                 {
929                 /* Work out correct protocol version to use */
930                 int hversion = (p[0] << 8)|p[1];
931                 int options = s->options;
932                 if (hversion == DTLS1_2_VERSION
933                         && !(options & SSL_OP_NO_DTLSv1_2))
934                         s->method = DTLSv1_2_client_method();
935                 else if (tls1_suiteb(s))
936                         {
937                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
938                         s->version = hversion;
939                         al = SSL_AD_PROTOCOL_VERSION;
940                         goto f_err;
941                         }
942                 else if (hversion == DTLS1_VERSION
943                         && !(options & SSL_OP_NO_DTLSv1))
944                         s->method = DTLSv1_client_method();
945                 else
946                         {
947                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
948                         s->version = hversion;
949                         al = SSL_AD_PROTOCOL_VERSION;
950                         goto f_err;
951                         }
952                 s->version = s->client_version = s->method->version;
953                 }
954
955         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
956                 {
957                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
958                 s->version=(s->version&0xff00)|p[1];
959                 al=SSL_AD_PROTOCOL_VERSION;
960                 goto f_err;
961                 }
962         p+=2;
963
964         /* load the server hello data */
965         /* load the server random */
966         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
967         p+=SSL3_RANDOM_SIZE;
968
969         s->hit = 0;
970
971         /* get the session-id */
972         j= *(p++);
973
974         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
975                 {
976                 al=SSL_AD_ILLEGAL_PARAMETER;
977                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
978                 goto f_err;
979                 }
980
981 #ifndef OPENSSL_NO_TLSEXT
982         /* check if we want to resume the session based on external pre-shared secret */
983         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
984                 {
985                 SSL_CIPHER *pref_cipher=NULL;
986                 s->session->master_key_length=sizeof(s->session->master_key);
987                 if (s->tls_session_secret_cb(s, s->session->master_key,
988                                              &s->session->master_key_length,
989                                              NULL, &pref_cipher,
990                                              s->tls_session_secret_cb_arg))
991                         {
992                         s->session->cipher = pref_cipher ?
993                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
994                         s->hit = 1;
995                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
996                         }
997                 }
998 #endif /* OPENSSL_NO_TLSEXT */
999
1000         if (!s->hit && j != 0 && j == s->session->session_id_length
1001             && memcmp(p,s->session->session_id,j) == 0)
1002             {
1003             if(s->sid_ctx_length != s->session->sid_ctx_length
1004                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
1005                 {
1006                 /* actually a client application bug */
1007                 al=SSL_AD_ILLEGAL_PARAMETER;
1008                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1009                 goto f_err;
1010                 }
1011             s->s3->flags |= SSL3_FLAGS_CCS_OK;
1012             s->hit=1;
1013             }
1014         /* a miss or crap from the other end */
1015         if (!s->hit)
1016                 {
1017                 /* If we were trying for session-id reuse, make a new
1018                  * SSL_SESSION so we don't stuff up other people */
1019                 if (s->session->session_id_length > 0)
1020                         {
1021                         if (!ssl_get_new_session(s,0))
1022                                 {
1023                                 goto f_err;
1024                                 }
1025                         }
1026                 s->session->session_id_length=j;
1027                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1028                 }
1029         p+=j;
1030         c=ssl_get_cipher_by_char(s,p);
1031         if (c == NULL)
1032                 {
1033                 /* unknown cipher */
1034                 al=SSL_AD_ILLEGAL_PARAMETER;
1035                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1036                 goto f_err;
1037                 }
1038         /* Set version disabled mask now we know version */
1039         if (!SSL_USE_TLS1_2_CIPHERS(s))
1040                 ct->mask_ssl = SSL_TLSV1_2;
1041         else
1042                 ct->mask_ssl = 0;
1043         /* If it is a disabled cipher we didn't send it in client hello,
1044          * so return an error.
1045          */
1046         if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK))
1047                 {
1048                 al=SSL_AD_ILLEGAL_PARAMETER;
1049                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1050                 goto f_err;
1051                 }
1052         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1053
1054         sk=ssl_get_ciphers_by_id(s);
1055         i=sk_SSL_CIPHER_find(sk,c);
1056         if (i < 0)
1057                 {
1058                 /* we did not say we would use this cipher */
1059                 al=SSL_AD_ILLEGAL_PARAMETER;
1060                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1061                 goto f_err;
1062                 }
1063
1064         /* Depending on the session caching (internal/external), the cipher
1065            and/or cipher_id values may not be set. Make sure that
1066            cipher_id is set and use it for comparison. */
1067         if (s->session->cipher)
1068                 s->session->cipher_id = s->session->cipher->id;
1069         if (s->hit && (s->session->cipher_id != c->id))
1070                 {
1071 /* Workaround is now obsolete */
1072 #if 0
1073                 if (!(s->options &
1074                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1075 #endif
1076                         {
1077                         al=SSL_AD_ILLEGAL_PARAMETER;
1078                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1079                         goto f_err;
1080                         }
1081                 }
1082         s->s3->tmp.new_cipher=c;
1083         /* Don't digest cached records if no sigalgs: we may need them for
1084          * client authentication.
1085          */
1086         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1087                 goto f_err;
1088         /* lets get the compression algorithm */
1089         /* COMPRESSION */
1090 #ifdef OPENSSL_NO_COMP
1091         if (*(p++) != 0)
1092                 {
1093                 al=SSL_AD_ILLEGAL_PARAMETER;
1094                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1095                 goto f_err;
1096                 }
1097         /* If compression is disabled we'd better not try to resume a session
1098          * using compression.
1099          */
1100         if (s->session->compress_meth != 0)
1101                 {
1102                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1103                 goto f_err;
1104                 }
1105 #else
1106         j= *(p++);
1107         if (s->hit && j != s->session->compress_meth)
1108                 {
1109                 al=SSL_AD_ILLEGAL_PARAMETER;
1110                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1111                 goto f_err;
1112                 }
1113         if (j == 0)
1114                 comp=NULL;
1115         else if (!ssl_allow_compression(s))
1116                 {
1117                 al=SSL_AD_ILLEGAL_PARAMETER;
1118                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1119                 goto f_err;
1120                 }
1121         else
1122                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1123         
1124         if ((j != 0) && (comp == NULL))
1125                 {
1126                 al=SSL_AD_ILLEGAL_PARAMETER;
1127                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1128                 goto f_err;
1129                 }
1130         else
1131                 {
1132                 s->s3->tmp.new_compression=comp;
1133                 }
1134 #endif
1135
1136 #ifndef OPENSSL_NO_TLSEXT
1137         /* TLS extensions*/
1138         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1139                 {
1140                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1141                 goto err; 
1142                 }
1143 #endif
1144
1145         if (p != (d+n))
1146                 {
1147                 /* wrong packet length */
1148                 al=SSL_AD_DECODE_ERROR;
1149                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1150                 goto f_err;
1151                 }
1152
1153         return(1);
1154 f_err:
1155         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1156 err:
1157         return(-1);
1158         }
1159
1160 int ssl3_get_server_certificate(SSL *s)
1161         {
1162         int al,i,ok,ret= -1;
1163         unsigned long n,nc,llen,l;
1164         X509 *x=NULL;
1165         const unsigned char *q,*p;
1166         unsigned char *d;
1167         STACK_OF(X509) *sk=NULL;
1168         SESS_CERT *sc;
1169         EVP_PKEY *pkey=NULL;
1170         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1171
1172         n=s->method->ssl_get_message(s,
1173                 SSL3_ST_CR_CERT_A,
1174                 SSL3_ST_CR_CERT_B,
1175                 -1,
1176                 s->max_cert_list,
1177                 &ok);
1178
1179         if (!ok) return((int)n);
1180
1181         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1182                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 
1183                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1184                 {
1185                 s->s3->tmp.reuse_message=1;
1186                 return(1);
1187                 }
1188
1189         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1190                 {
1191                 al=SSL_AD_UNEXPECTED_MESSAGE;
1192                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1193                 goto f_err;
1194                 }
1195         p=d=(unsigned char *)s->init_msg;
1196
1197         if ((sk=sk_X509_new_null()) == NULL)
1198                 {
1199                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1200                 goto err;
1201                 }
1202
1203         n2l3(p,llen);
1204         if (llen+3 != n)
1205                 {
1206                 al=SSL_AD_DECODE_ERROR;
1207                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1208                 goto f_err;
1209                 }
1210         for (nc=0; nc<llen; )
1211                 {
1212                 n2l3(p,l);
1213                 if ((l+nc+3) > llen)
1214                         {
1215                         al=SSL_AD_DECODE_ERROR;
1216                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1217                         goto f_err;
1218                         }
1219
1220                 q=p;
1221                 x=d2i_X509(NULL,&q,l);
1222                 if (x == NULL)
1223                         {
1224                         al=SSL_AD_BAD_CERTIFICATE;
1225                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1226                         goto f_err;
1227                         }
1228                 if (q != (p+l))
1229                         {
1230                         al=SSL_AD_DECODE_ERROR;
1231                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1232                         goto f_err;
1233                         }
1234                 if (!sk_X509_push(sk,x))
1235                         {
1236                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1237                         goto err;
1238                         }
1239                 x=NULL;
1240                 nc+=l+3;
1241                 p=q;
1242                 }
1243
1244         i=ssl_verify_cert_chain(s,sk);
1245         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1246 #ifndef OPENSSL_NO_KRB5
1247             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1248                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1249 #endif /* OPENSSL_NO_KRB5 */
1250                 )
1251                 {
1252                 al=ssl_verify_alarm_type(s->verify_result);
1253                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1254                 goto f_err; 
1255                 }
1256         ERR_clear_error(); /* but we keep s->verify_result */
1257         if (i > 1)
1258                 {
1259                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1260                 al = SSL_AD_HANDSHAKE_FAILURE;
1261                 goto f_err;
1262                 }
1263
1264         sc=ssl_sess_cert_new();
1265         if (sc == NULL) goto err;
1266
1267         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1268         s->session->sess_cert=sc;
1269
1270         sc->cert_chain=sk;
1271         /* Inconsistency alert: cert_chain does include the peer's
1272          * certificate, which we don't include in s3_srvr.c */
1273         x=sk_X509_value(sk,0);
1274         sk=NULL;
1275         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1276
1277         pkey=X509_get_pubkey(x);
1278
1279         /* VRS: allow null cert if auth == KRB5 */
1280         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1281                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1282                     ? 0 : 1;
1283
1284 #ifdef KSSL_DEBUG
1285         printf("pkey,x = %p, %p\n", pkey,x);
1286         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1287         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1288                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1289 #endif    /* KSSL_DEBUG */
1290
1291         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1292                 {
1293                 x=NULL;
1294                 al=SSL3_AL_FATAL;
1295                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1296                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1297                 goto f_err;
1298                 }
1299
1300         i=ssl_cert_type(x,pkey);
1301         if (need_cert && i < 0)
1302                 {
1303                 x=NULL;
1304                 al=SSL3_AL_FATAL;
1305                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1306                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1307                 goto f_err;
1308                 }
1309
1310         if (need_cert)
1311                 {
1312                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1313                 if (exp_idx >= 0 && i != exp_idx)
1314                         {
1315                         x=NULL;
1316                         al=SSL_AD_ILLEGAL_PARAMETER;
1317                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1318                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1319                         goto f_err;
1320                         }
1321                 sc->peer_cert_type=i;
1322                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1323                 /* Why would the following ever happen?
1324                  * We just created sc a couple of lines ago. */
1325                 if (sc->peer_pkeys[i].x509 != NULL)
1326                         X509_free(sc->peer_pkeys[i].x509);
1327                 sc->peer_pkeys[i].x509=x;
1328                 sc->peer_key= &(sc->peer_pkeys[i]);
1329
1330                 if (s->session->peer != NULL)
1331                         X509_free(s->session->peer);
1332                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1333                 s->session->peer=x;
1334                 }
1335         else
1336                 {
1337                 sc->peer_cert_type=i;
1338                 sc->peer_key= NULL;
1339
1340                 if (s->session->peer != NULL)
1341                         X509_free(s->session->peer);
1342                 s->session->peer=NULL;
1343                 }
1344         s->session->verify_result = s->verify_result;
1345
1346         x=NULL;
1347         ret=1;
1348         if (0)
1349                 {
1350 f_err:
1351                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1352                 }
1353 err:
1354         EVP_PKEY_free(pkey);
1355         X509_free(x);
1356         sk_X509_pop_free(sk,X509_free);
1357         return(ret);
1358         }
1359
1360 int ssl3_get_key_exchange(SSL *s)
1361         {
1362 #ifndef OPENSSL_NO_RSA
1363         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1364 #endif
1365         EVP_MD_CTX md_ctx;
1366         unsigned char *param,*p;
1367         int al,j,ok;
1368         long i,param_len,n,alg_k,alg_a;
1369         EVP_PKEY *pkey=NULL;
1370         const EVP_MD *md = NULL;
1371 #ifndef OPENSSL_NO_RSA
1372         RSA *rsa=NULL;
1373 #endif
1374 #ifndef OPENSSL_NO_DH
1375         DH *dh=NULL;
1376 #endif
1377 #ifndef OPENSSL_NO_ECDH
1378         EC_KEY *ecdh = NULL;
1379         BN_CTX *bn_ctx = NULL;
1380         EC_POINT *srvr_ecpoint = NULL;
1381         int curve_nid = 0;
1382         int encoded_pt_len = 0;
1383 #endif
1384
1385         /* use same message size as in ssl3_get_certificate_request()
1386          * as ServerKeyExchange message may be skipped */
1387         n=s->method->ssl_get_message(s,
1388                 SSL3_ST_CR_KEY_EXCH_A,
1389                 SSL3_ST_CR_KEY_EXCH_B,
1390                 -1,
1391                 s->max_cert_list,
1392                 &ok);
1393         if (!ok) return((int)n);
1394
1395         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1396                 {
1397 #ifndef OPENSSL_NO_PSK
1398                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1399                    omitted if no identity hint is sent. Set
1400                    session->sess_cert anyway to avoid problems
1401                    later.*/
1402                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1403                         {
1404                         s->session->sess_cert=ssl_sess_cert_new();
1405                         if (s->ctx->psk_identity_hint)
1406                                 OPENSSL_free(s->ctx->psk_identity_hint);
1407                         s->ctx->psk_identity_hint = NULL;
1408                         }
1409 #endif
1410                 s->s3->tmp.reuse_message=1;
1411                 return(1);
1412                 }
1413
1414         param=p=(unsigned char *)s->init_msg;
1415         if (s->session->sess_cert != NULL)
1416                 {
1417 #ifndef OPENSSL_NO_RSA
1418                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1419                         {
1420                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1421                         s->session->sess_cert->peer_rsa_tmp=NULL;
1422                         }
1423 #endif
1424 #ifndef OPENSSL_NO_DH
1425                 if (s->session->sess_cert->peer_dh_tmp)
1426                         {
1427                         DH_free(s->session->sess_cert->peer_dh_tmp);
1428                         s->session->sess_cert->peer_dh_tmp=NULL;
1429                         }
1430 #endif
1431 #ifndef OPENSSL_NO_ECDH
1432                 if (s->session->sess_cert->peer_ecdh_tmp)
1433                         {
1434                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1435                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1436                         }
1437 #endif
1438                 }
1439         else
1440                 {
1441                 s->session->sess_cert=ssl_sess_cert_new();
1442                 }
1443
1444         /* Total length of the parameters including the length prefix */
1445         param_len=0;
1446
1447         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1448         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1449         EVP_MD_CTX_init(&md_ctx);
1450
1451         al=SSL_AD_DECODE_ERROR;
1452
1453 #ifndef OPENSSL_NO_PSK
1454         if (alg_k & SSL_kPSK)
1455                 {
1456                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1457
1458                 param_len = 2;
1459                 if (param_len > n)
1460                         {
1461                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1462                                 SSL_R_LENGTH_TOO_SHORT);
1463                         goto f_err;
1464                         }
1465                 n2s(p,i);
1466
1467                 /* Store PSK identity hint for later use, hint is used
1468                  * in ssl3_send_client_key_exchange.  Assume that the
1469                  * maximum length of a PSK identity hint can be as
1470                  * long as the maximum length of a PSK identity. */
1471                 if (i > PSK_MAX_IDENTITY_LEN)
1472                         {
1473                         al=SSL_AD_HANDSHAKE_FAILURE;
1474                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1475                                 SSL_R_DATA_LENGTH_TOO_LONG);
1476                         goto f_err;
1477                         }
1478                 if (i > n - param_len)
1479                         {
1480                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1481                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1482                         goto f_err;
1483                         }
1484                 param_len += i;
1485
1486                 /* If received PSK identity hint contains NULL
1487                  * characters, the hint is truncated from the first
1488                  * NULL. p may not be ending with NULL, so create a
1489                  * NULL-terminated string. */
1490                 memcpy(tmp_id_hint, p, i);
1491                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1492                 if (s->ctx->psk_identity_hint != NULL)
1493                         OPENSSL_free(s->ctx->psk_identity_hint);
1494                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1495                 if (s->ctx->psk_identity_hint == NULL)
1496                         {
1497                         al=SSL_AD_HANDSHAKE_FAILURE;
1498                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1499                         goto f_err;
1500                         }          
1501
1502                 p+=i;
1503                 n-=param_len;
1504                 }
1505         else
1506 #endif /* !OPENSSL_NO_PSK */
1507 #ifndef OPENSSL_NO_SRP
1508         if (alg_k & SSL_kSRP)
1509                 {
1510                 param_len = 2;
1511                 if (param_len > n)
1512                         {
1513                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1514                                 SSL_R_LENGTH_TOO_SHORT);
1515                         goto f_err;
1516                         }
1517                 n2s(p,i);
1518
1519                 if (i > n - param_len)
1520                         {
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1522                         goto f_err;
1523                         }
1524                 param_len += i;
1525
1526                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1527                         {
1528                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1529                         goto err;
1530                         }
1531                 p+=i;
1532
1533
1534                 if (2 > n - param_len)
1535                         {
1536                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1537                                 SSL_R_LENGTH_TOO_SHORT);
1538                         goto f_err;
1539                         }
1540                 param_len += 2;
1541
1542                 n2s(p,i);
1543
1544                 if (i > n - param_len)
1545                         {
1546                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1547                         goto f_err;
1548                         }
1549                 param_len += i;
1550
1551                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1552                         {
1553                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1554                         goto err;
1555                         }
1556                 p+=i;
1557
1558
1559                 if (1 > n - param_len)
1560                         {
1561                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1562                                 SSL_R_LENGTH_TOO_SHORT);
1563                         goto f_err;
1564                         }
1565                 param_len += 1;
1566
1567                 i = (unsigned int)(p[0]);
1568                 p++;
1569
1570                 if (i > n - param_len)
1571                         {
1572                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1573                         goto f_err;
1574                         }
1575                 param_len += i;
1576
1577                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1578                         {
1579                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1580                         goto err;
1581                         }
1582                 p+=i;
1583
1584                 if (2 > n - param_len)
1585                         {
1586                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1587                                 SSL_R_LENGTH_TOO_SHORT);
1588                         goto f_err;
1589                         }
1590                 param_len += 2;
1591
1592                 n2s(p,i);
1593
1594                 if (i > n - param_len)
1595                         {
1596                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1597                         goto f_err;
1598                         }
1599                 param_len += i;
1600
1601                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1602                         {
1603                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1604                         goto err;
1605                         }
1606                 p+=i;
1607                 n-=param_len;
1608
1609                 if (!srp_verify_server_param(s, &al))
1610                         {
1611                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1612                         goto f_err;
1613                         }
1614
1615 /* We must check if there is a certificate */
1616 #ifndef OPENSSL_NO_RSA
1617                 if (alg_a & SSL_aRSA)
1618                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1619 #else
1620                 if (0)
1621                         ;
1622 #endif
1623 #ifndef OPENSSL_NO_DSA
1624                 else if (alg_a & SSL_aDSS)
1625                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1626 #endif
1627                 }
1628         else
1629 #endif /* !OPENSSL_NO_SRP */
1630 #ifndef OPENSSL_NO_RSA
1631         if (alg_k & SSL_kRSA)
1632                 {
1633                 if ((rsa=RSA_new()) == NULL)
1634                         {
1635                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1636                         goto err;
1637                         }
1638
1639                 param_len = 2;
1640                 if (param_len > n)
1641                         {
1642                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1643                                 SSL_R_LENGTH_TOO_SHORT);
1644                         goto f_err;
1645                         }
1646                 n2s(p,i);
1647
1648                 if (i > n - param_len)
1649                         {
1650                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1651                         goto f_err;
1652                         }
1653                 param_len += i;
1654
1655                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1656                         {
1657                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1658                         goto err;
1659                         }
1660                 p+=i;
1661
1662                 if (2 > n - param_len)
1663                         {
1664                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1665                                 SSL_R_LENGTH_TOO_SHORT);
1666                         goto f_err;
1667                         }
1668                 param_len += 2;
1669
1670                 n2s(p,i);
1671
1672                 if (i > n - param_len)
1673                         {
1674                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1675                         goto f_err;
1676                         }
1677                 param_len += i;
1678
1679                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1680                         {
1681                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1682                         goto err;
1683                         }
1684                 p+=i;
1685                 n-=param_len;
1686
1687                 /* this should be because we are using an export cipher */
1688                 if (alg_a & SSL_aRSA)
1689                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1690                 else
1691                         {
1692                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1693                         goto err;
1694                         }
1695                 s->session->sess_cert->peer_rsa_tmp=rsa;
1696                 rsa=NULL;
1697                 }
1698 #else /* OPENSSL_NO_RSA */
1699         if (0)
1700                 ;
1701 #endif
1702 #ifndef OPENSSL_NO_DH
1703         else if (alg_k & SSL_kDHE)
1704                 {
1705                 if ((dh=DH_new()) == NULL)
1706                         {
1707                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1708                         goto err;
1709                         }
1710
1711                 param_len = 2;
1712                 if (param_len > n)
1713                         {
1714                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1715                                 SSL_R_LENGTH_TOO_SHORT);
1716                         goto f_err;
1717                         }
1718                 n2s(p,i);
1719
1720                 if (i > n - param_len)
1721                         {
1722                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1723                         goto f_err;
1724                         }
1725                 param_len += i;
1726
1727                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1728                         {
1729                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1730                         goto err;
1731                         }
1732                 p+=i;
1733
1734                 if (2 > n - param_len)
1735                         {
1736                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1737                                 SSL_R_LENGTH_TOO_SHORT);
1738                         goto f_err;
1739                         }
1740                 param_len += 2;
1741
1742                 n2s(p,i);
1743
1744                 if (i > n - param_len)
1745                         {
1746                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1747                         goto f_err;
1748                         }
1749                 param_len += i;
1750
1751                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1752                         {
1753                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1754                         goto err;
1755                         }
1756                 p+=i;
1757
1758                 if (2 > n - param_len)
1759                         {
1760                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1761                                 SSL_R_LENGTH_TOO_SHORT);
1762                         goto f_err;
1763                         }
1764                 param_len += 2;
1765
1766                 n2s(p,i);
1767
1768                 if (i > n - param_len)
1769                         {
1770                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1771                         goto f_err;
1772                         }
1773                 param_len += i;
1774
1775                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1776                         {
1777                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1778                         goto err;
1779                         }
1780                 p+=i;
1781                 n-=param_len;
1782
1783                 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1784                                                 DH_security_bits(dh), 0, dh))
1785                         {
1786                         al=SSL_AD_HANDSHAKE_FAILURE;
1787                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_DH_KEY_TOO_SMALL);
1788                         goto f_err;
1789                         }
1790
1791 #ifndef OPENSSL_NO_RSA
1792                 if (alg_a & SSL_aRSA)
1793                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1794 #else
1795                 if (0)
1796                         ;
1797 #endif
1798 #ifndef OPENSSL_NO_DSA
1799                 else if (alg_a & SSL_aDSS)
1800                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1801 #endif
1802                 /* else anonymous DH, so no certificate or pkey. */
1803
1804                 s->session->sess_cert->peer_dh_tmp=dh;
1805                 dh=NULL;
1806                 }
1807         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1808                 {
1809                 al=SSL_AD_ILLEGAL_PARAMETER;
1810                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1811                 goto f_err;
1812                 }
1813 #endif /* !OPENSSL_NO_DH */
1814
1815 #ifndef OPENSSL_NO_ECDH
1816         else if (alg_k & SSL_kECDHE)
1817                 {
1818                 EC_GROUP *ngroup;
1819                 const EC_GROUP *group;
1820
1821                 if ((ecdh=EC_KEY_new()) == NULL)
1822                         {
1823                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1824                         goto err;
1825                         }
1826
1827                 /* Extract elliptic curve parameters and the
1828                  * server's ephemeral ECDH public key.
1829                  * Keep accumulating lengths of various components in
1830                  * param_len and make sure it never exceeds n.
1831                  */
1832
1833                 /* XXX: For now we only support named (not generic) curves
1834                  * and the ECParameters in this case is just three bytes. We
1835                  * also need one byte for the length of the encoded point
1836                  */
1837                 param_len=4;
1838                 if (param_len > n)
1839                         {
1840                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1841                                 SSL_R_LENGTH_TOO_SHORT);
1842                         goto f_err;
1843                         }
1844                 /* Check curve is one of our preferences, if not server has
1845                  * sent an invalid curve. ECParameters is 3 bytes.
1846                  */
1847                 if (!tls1_check_curve(s, p, 3))
1848                         {
1849                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1850                         goto f_err;
1851                         }
1852
1853                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) 
1854                         {
1855                         al=SSL_AD_INTERNAL_ERROR;
1856                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1857                         goto f_err;
1858                         }
1859
1860                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1861                 if (ngroup == NULL)
1862                         {
1863                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1864                         goto err;
1865                         }
1866                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1867                         {
1868                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1869                         goto err;
1870                         }
1871                 EC_GROUP_free(ngroup);
1872
1873                 group = EC_KEY_get0_group(ecdh);
1874
1875                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1876                     (EC_GROUP_get_degree(group) > 163))
1877                         {
1878                         al=SSL_AD_EXPORT_RESTRICTION;
1879                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1880                         goto f_err;
1881                         }
1882
1883                 p+=3;
1884
1885                 /* Next, get the encoded ECPoint */
1886                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1887                     ((bn_ctx = BN_CTX_new()) == NULL))
1888                         {
1889                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1890                         goto err;
1891                         }
1892
1893                 encoded_pt_len = *p;  /* length of encoded point */
1894                 p+=1;
1895
1896                 if ((encoded_pt_len > n - param_len) ||
1897                     (EC_POINT_oct2point(group, srvr_ecpoint, 
1898                         p, encoded_pt_len, bn_ctx) == 0))
1899                         {
1900                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1901                         goto f_err;
1902                         }
1903                 param_len += encoded_pt_len;
1904
1905                 n-=param_len;
1906                 p+=encoded_pt_len;
1907
1908                 /* The ECC/TLS specification does not mention
1909                  * the use of DSA to sign ECParameters in the server
1910                  * key exchange message. We do support RSA and ECDSA.
1911                  */
1912                 if (0) ;
1913 #ifndef OPENSSL_NO_RSA
1914                 else if (alg_a & SSL_aRSA)
1915                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1916 #endif
1917 #ifndef OPENSSL_NO_ECDSA
1918                 else if (alg_a & SSL_aECDSA)
1919                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1920 #endif
1921                 /* else anonymous ECDH, so no certificate or pkey. */
1922                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1923                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1924                 ecdh=NULL;
1925                 BN_CTX_free(bn_ctx);
1926                 bn_ctx = NULL;
1927                 EC_POINT_free(srvr_ecpoint);
1928                 srvr_ecpoint = NULL;
1929                 }
1930         else if (alg_k)
1931                 {
1932                 al=SSL_AD_UNEXPECTED_MESSAGE;
1933                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1934                 goto f_err;
1935                 }
1936 #endif /* !OPENSSL_NO_ECDH */
1937
1938
1939         /* p points to the next byte, there are 'n' bytes left */
1940
1941         /* if it was signed, check the signature */
1942         if (pkey != NULL)
1943                 {
1944                 if (SSL_USE_SIGALGS(s))
1945                         {
1946                         int rv;
1947                         if (2 > n)
1948                                 {
1949                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1950                                         SSL_R_LENGTH_TOO_SHORT);
1951                                 goto f_err;
1952                                 }
1953                         rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1954                         if (rv == -1)
1955                                 goto err;
1956                         else if (rv == 0)
1957                                 {
1958                                 goto f_err;
1959                                 }
1960 #ifdef SSL_DEBUG
1961 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1962 #endif
1963                         p += 2;
1964                         n -= 2;
1965                         }
1966                 else
1967                         md = EVP_sha1();
1968
1969                 if (2 > n)
1970                         {
1971                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1972                                 SSL_R_LENGTH_TOO_SHORT);
1973                         goto f_err;
1974                         }
1975                 n2s(p,i);
1976                 n-=2;
1977                 j=EVP_PKEY_size(pkey);
1978
1979                 /* Check signature length. If n is 0 then signature is empty */
1980                 if ((i != n) || (n > j) || (n <= 0))
1981                         {
1982                         /* wrong packet length */
1983                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1984                         goto f_err;
1985                         }
1986
1987 #ifndef OPENSSL_NO_RSA
1988                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1989                         {
1990                         int num;
1991                         unsigned int size;
1992
1993                         j=0;
1994                         q=md_buf;
1995                         for (num=2; num > 0; num--)
1996                                 {
1997                                 EVP_MD_CTX_set_flags(&md_ctx,
1998                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1999                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
2000                                         ?s->ctx->md5:s->ctx->sha1, NULL);
2001                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2002                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2003                                 EVP_DigestUpdate(&md_ctx,param,param_len);
2004                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
2005                                 q+=size;
2006                                 j+=size;
2007                                 }
2008                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
2009                                                                 pkey->pkey.rsa);
2010                         if (i < 0)
2011                                 {
2012                                 al=SSL_AD_DECRYPT_ERROR;
2013                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
2014                                 goto f_err;
2015                                 }
2016                         if (i == 0)
2017                                 {
2018                                 /* bad signature */
2019                                 al=SSL_AD_DECRYPT_ERROR;
2020                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2021                                 goto f_err;
2022                                 }
2023                         }
2024                 else
2025 #endif
2026                         {
2027                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
2028                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2029                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2030                         EVP_VerifyUpdate(&md_ctx,param,param_len);
2031                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
2032                                 {
2033                                 /* bad signature */
2034                                 al=SSL_AD_DECRYPT_ERROR;
2035                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2036                                 goto f_err;
2037                                 }
2038                         }
2039                 }
2040         else
2041                 {
2042                 /* aNULL, aSRP or kPSK do not need public keys */
2043                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
2044                         {
2045                         /* Might be wrong key type, check it */
2046                         if (ssl3_check_cert_and_algorithm(s))
2047                                 /* Otherwise this shouldn't happen */
2048                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2049                         goto err;
2050                         }
2051                 /* still data left over */
2052                 if (n != 0)
2053                         {
2054                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
2055                         goto f_err;
2056                         }
2057                 }
2058         EVP_PKEY_free(pkey);
2059         EVP_MD_CTX_cleanup(&md_ctx);
2060         return(1);
2061 f_err:
2062         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2063 err:
2064         EVP_PKEY_free(pkey);
2065 #ifndef OPENSSL_NO_RSA
2066         if (rsa != NULL)
2067                 RSA_free(rsa);
2068 #endif
2069 #ifndef OPENSSL_NO_DH
2070         if (dh != NULL)
2071                 DH_free(dh);
2072 #endif
2073 #ifndef OPENSSL_NO_ECDH
2074         BN_CTX_free(bn_ctx);
2075         EC_POINT_free(srvr_ecpoint);
2076         if (ecdh != NULL)
2077                 EC_KEY_free(ecdh);
2078 #endif
2079         EVP_MD_CTX_cleanup(&md_ctx);
2080         return(-1);
2081         }
2082
2083 int ssl3_get_certificate_request(SSL *s)
2084         {
2085         int ok,ret=0;
2086         unsigned long n,nc,l;
2087         unsigned int llen, ctype_num,i;
2088         X509_NAME *xn=NULL;
2089         const unsigned char *p,*q;
2090         unsigned char *d;
2091         STACK_OF(X509_NAME) *ca_sk=NULL;
2092
2093         n=s->method->ssl_get_message(s,
2094                 SSL3_ST_CR_CERT_REQ_A,
2095                 SSL3_ST_CR_CERT_REQ_B,
2096                 -1,
2097                 s->max_cert_list,
2098                 &ok);
2099
2100         if (!ok) return((int)n);
2101
2102         s->s3->tmp.cert_req=0;
2103
2104         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2105                 {
2106                 s->s3->tmp.reuse_message=1;
2107                 /* If we get here we don't need any cached handshake records
2108                  * as we wont be doing client auth.
2109                  */
2110                 if (s->s3->handshake_buffer)
2111                         {
2112                         if (!ssl3_digest_cached_records(s))
2113                                 goto err;
2114                         }
2115                 return(1);
2116                 }
2117
2118         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2119                 {
2120                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2121                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2122                 goto err;
2123                 }
2124
2125         /* TLS does not like anon-DH with client cert */
2126         if (s->version > SSL3_VERSION)
2127                 {
2128                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2129                         {
2130                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2131                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2132                         goto err;
2133                         }
2134                 }
2135
2136         p=d=(unsigned char *)s->init_msg;
2137
2138         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2139                 {
2140                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2141                 goto err;
2142                 }
2143
2144         /* get the certificate types */
2145         ctype_num= *(p++);
2146         if (s->cert->ctypes)
2147                 {
2148                 OPENSSL_free(s->cert->ctypes);
2149                 s->cert->ctypes = NULL;
2150                 }
2151         if (ctype_num > SSL3_CT_NUMBER)
2152                 {
2153                 /* If we exceed static buffer copy all to cert structure */
2154                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2155                 memcpy(s->cert->ctypes, p, ctype_num);
2156                 s->cert->ctype_num = (size_t)ctype_num;
2157                 ctype_num=SSL3_CT_NUMBER;
2158                 }
2159         for (i=0; i<ctype_num; i++)
2160                 s->s3->tmp.ctype[i]= p[i];
2161         p+=p[-1];
2162         if (SSL_USE_SIGALGS(s))
2163                 {
2164                 n2s(p, llen);
2165                 /* Check we have enough room for signature algorithms and
2166                  * following length value.
2167                  */
2168                 if ((unsigned long)(p - d + llen + 2) > n)
2169                         {
2170                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2171                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2172                         goto err;
2173                         }
2174                 /* Clear certificate digests and validity flags */
2175                 for (i = 0; i < SSL_PKEY_NUM; i++)
2176                         {
2177                         s->cert->pkeys[i].digest = NULL;
2178                         s->cert->pkeys[i].valid_flags = 0;
2179                         }
2180                 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen))
2181                         {
2182                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2183                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2184                         goto err;
2185                         }
2186                 if (!tls1_process_sigalgs(s))
2187                         {
2188                         ssl3_send_alert(s,SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2189                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2190                         goto err;
2191                         }
2192                 p += llen;
2193                 }
2194
2195         /* get the CA RDNs */
2196         n2s(p,llen);
2197 #if 0
2198 {
2199 FILE *out;
2200 out=fopen("/tmp/vsign.der","w");
2201 fwrite(p,1,llen,out);
2202 fclose(out);
2203 }
2204 #endif
2205
2206         if ((unsigned long)(p - d + llen) != n)
2207                 {
2208                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2209                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2210                 goto err;
2211                 }
2212
2213         for (nc=0; nc<llen; )
2214                 {
2215                 n2s(p,l);
2216                 if ((l+nc+2) > llen)
2217                         {
2218                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2219                                 goto cont; /* netscape bugs */
2220                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2221                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2222                         goto err;
2223                         }
2224
2225                 q=p;
2226
2227                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2228                         {
2229                         /* If netscape tolerance is on, ignore errors */
2230                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2231                                 goto cont;
2232                         else
2233                                 {
2234                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2235                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2236                                 goto err;
2237                                 }
2238                         }
2239
2240                 if (q != (p+l))
2241                         {
2242                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2243                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2244                         goto err;
2245                         }
2246                 if (!sk_X509_NAME_push(ca_sk,xn))
2247                         {
2248                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2249                         goto err;
2250                         }
2251
2252                 p+=l;
2253                 nc+=l+2;
2254                 }
2255
2256         if (0)
2257                 {
2258 cont:
2259                 ERR_clear_error();
2260                 }
2261
2262         /* we should setup a certificate to return.... */
2263         s->s3->tmp.cert_req=1;
2264         s->s3->tmp.ctype_num=ctype_num;
2265         if (s->s3->tmp.ca_names != NULL)
2266                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2267         s->s3->tmp.ca_names=ca_sk;
2268         ca_sk=NULL;
2269
2270         ret=1;
2271 err:
2272         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2273         return(ret);
2274         }
2275
2276 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2277         {
2278         return(X509_NAME_cmp(*a,*b));
2279         }
2280 #ifndef OPENSSL_NO_TLSEXT
2281 int ssl3_get_new_session_ticket(SSL *s)
2282         {
2283         int ok,al,ret=0, ticklen;
2284         long n;
2285         const unsigned char *p;
2286         unsigned char *d;
2287
2288         n=s->method->ssl_get_message(s,
2289                 SSL3_ST_CR_SESSION_TICKET_A,
2290                 SSL3_ST_CR_SESSION_TICKET_B,
2291                 -1,
2292                 16384,
2293                 &ok);
2294
2295         if (!ok)
2296                 return((int)n);
2297
2298         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2299                 {
2300                 s->s3->tmp.reuse_message=1;
2301                 return(1);
2302                 }
2303         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2304                 {
2305                 al=SSL_AD_UNEXPECTED_MESSAGE;
2306                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2307                 goto f_err;
2308                 }
2309         if (n < 6)
2310                 {
2311                 /* need at least ticket_lifetime_hint + ticket length */
2312                 al = SSL_AD_DECODE_ERROR;
2313                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2314                 goto f_err;
2315                 }
2316
2317         p=d=(unsigned char *)s->init_msg;
2318         n2l(p, s->session->tlsext_tick_lifetime_hint);
2319         n2s(p, ticklen);
2320         /* ticket_lifetime_hint + ticket_length + ticket */
2321         if (ticklen + 6 != n)
2322                 {
2323                 al = SSL_AD_DECODE_ERROR;
2324                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2325                 goto f_err;
2326                 }
2327         if (s->session->tlsext_tick)
2328                 {
2329                 OPENSSL_free(s->session->tlsext_tick);
2330                 s->session->tlsext_ticklen = 0;
2331                 }
2332         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2333         if (!s->session->tlsext_tick)
2334                 {
2335                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2336                 goto err;
2337                 }
2338         memcpy(s->session->tlsext_tick, p, ticklen);
2339         s->session->tlsext_ticklen = ticklen;
2340         /* There are two ways to detect a resumed ticket session.
2341          * One is to set an appropriate session ID and then the server
2342          * must return a match in ServerHello. This allows the normal
2343          * client session ID matching to work and we know much 
2344          * earlier that the ticket has been accepted.
2345          * 
2346          * The other way is to set zero length session ID when the
2347          * ticket is presented and rely on the handshake to determine
2348          * session resumption.
2349          *
2350          * We choose the former approach because this fits in with
2351          * assumptions elsewhere in OpenSSL. The session ID is set
2352          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2353          * ticket.
2354          */ 
2355         EVP_Digest(p, ticklen,
2356                         s->session->session_id, &s->session->session_id_length,
2357 #ifndef OPENSSL_NO_SHA256
2358                                                         EVP_sha256(), NULL);
2359 #else
2360                                                         EVP_sha1(), NULL);
2361 #endif
2362         ret=1;
2363         return(ret);
2364 f_err:
2365         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2366 err:
2367         return(-1);
2368         }
2369
2370 int ssl3_get_cert_status(SSL *s)
2371         {
2372         int ok, al;
2373         unsigned long resplen,n;
2374         const unsigned char *p;
2375
2376         n=s->method->ssl_get_message(s,
2377                 SSL3_ST_CR_CERT_STATUS_A,
2378                 SSL3_ST_CR_CERT_STATUS_B,
2379                 SSL3_MT_CERTIFICATE_STATUS,
2380                 16384,
2381                 &ok);
2382
2383         if (!ok) return((int)n);
2384         if (n < 4)
2385                 {
2386                 /* need at least status type + length */
2387                 al = SSL_AD_DECODE_ERROR;
2388                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2389                 goto f_err;
2390                 }
2391         p = (unsigned char *)s->init_msg;
2392         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2393                 {
2394                 al = SSL_AD_DECODE_ERROR;
2395                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2396                 goto f_err;
2397                 }
2398         n2l3(p, resplen);
2399         if (resplen + 4 != n)
2400                 {
2401                 al = SSL_AD_DECODE_ERROR;
2402                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2403                 goto f_err;
2404                 }
2405         if (s->tlsext_ocsp_resp)
2406                 OPENSSL_free(s->tlsext_ocsp_resp);
2407         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2408         if (!s->tlsext_ocsp_resp)
2409                 {
2410                 al = SSL_AD_INTERNAL_ERROR;
2411                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2412                 goto f_err;
2413                 }
2414         s->tlsext_ocsp_resplen = resplen;
2415         if (s->ctx->tlsext_status_cb)
2416                 {
2417                 int ret;
2418                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2419                 if (ret == 0)
2420                         {
2421                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2422                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2423                         goto f_err;
2424                         }
2425                 if (ret < 0)
2426                         {
2427                         al = SSL_AD_INTERNAL_ERROR;
2428                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2429                         goto f_err;
2430                         }
2431                 }
2432         return 1;
2433 f_err:
2434         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2435         return(-1);
2436         }
2437 #endif
2438
2439 int ssl3_get_server_done(SSL *s)
2440         {
2441         int ok,ret=0;
2442         long n;
2443
2444         n=s->method->ssl_get_message(s,
2445                 SSL3_ST_CR_SRVR_DONE_A,
2446                 SSL3_ST_CR_SRVR_DONE_B,
2447                 SSL3_MT_SERVER_DONE,
2448                 30, /* should be very small, like 0 :-) */
2449                 &ok);
2450
2451         if (!ok) return((int)n);
2452         if (n > 0)
2453                 {
2454                 /* should contain no data */
2455                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2456                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2457                 return -1;
2458                 }
2459         ret=1;
2460         return(ret);
2461         }
2462
2463
2464 int ssl3_send_client_key_exchange(SSL *s)
2465         {
2466         unsigned char *p;
2467         int n;
2468         unsigned long alg_k;
2469 #ifndef OPENSSL_NO_RSA
2470         unsigned char *q;
2471         EVP_PKEY *pkey=NULL;
2472 #endif
2473 #ifndef OPENSSL_NO_KRB5
2474         KSSL_ERR kssl_err;
2475 #endif /* OPENSSL_NO_KRB5 */
2476 #ifndef OPENSSL_NO_ECDH
2477         EC_KEY *clnt_ecdh = NULL;
2478         const EC_POINT *srvr_ecpoint = NULL;
2479         EVP_PKEY *srvr_pub_pkey = NULL;
2480         unsigned char *encodedPoint = NULL;
2481         int encoded_pt_len = 0;
2482         BN_CTX * bn_ctx = NULL;
2483 #endif
2484
2485         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2486                 {
2487                 p = ssl_handshake_start(s);
2488
2489                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2490
2491                 /* Fool emacs indentation */
2492                 if (0) {}
2493 #ifndef OPENSSL_NO_RSA
2494                 else if (alg_k & SSL_kRSA)
2495                         {
2496                         RSA *rsa;
2497                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2498
2499                         if (s->session->sess_cert == NULL)
2500                                 {
2501                                 /* We should always have a server certificate with SSL_kRSA. */
2502                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2503                                 goto err;
2504                                 }
2505
2506                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2507                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2508                         else
2509                                 {
2510                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2511                                 if ((pkey == NULL) ||
2512                                         (pkey->type != EVP_PKEY_RSA) ||
2513                                         (pkey->pkey.rsa == NULL))
2514                                         {
2515                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2516                                         goto err;
2517                                         }
2518                                 rsa=pkey->pkey.rsa;
2519                                 EVP_PKEY_free(pkey);
2520                                 }
2521                                 
2522                         tmp_buf[0]=s->client_version>>8;
2523                         tmp_buf[1]=s->client_version&0xff;
2524                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2525                                         goto err;
2526
2527                         s->session->master_key_length=sizeof tmp_buf;
2528
2529                         q=p;
2530                         /* Fix buf for TLS and beyond */
2531                         if (s->version > SSL3_VERSION)
2532                                 p+=2;
2533                         n=RSA_public_encrypt(sizeof tmp_buf,
2534                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2535 #ifdef PKCS1_CHECK
2536                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2537                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2538 #endif
2539                         if (n <= 0)
2540                                 {
2541                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2542                                 goto err;
2543                                 }
2544
2545                         /* Fix buf for TLS and beyond */
2546                         if (s->version > SSL3_VERSION)
2547                                 {
2548                                 s2n(n,q);
2549                                 n+=2;
2550                                 }
2551
2552                         s->session->master_key_length=
2553                                 s->method->ssl3_enc->generate_master_secret(s,
2554                                         s->session->master_key,
2555                                         tmp_buf,sizeof tmp_buf);
2556                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2557                         }
2558 #endif
2559 #ifndef OPENSSL_NO_KRB5
2560                 else if (alg_k & SSL_kKRB5)
2561                         {
2562                         krb5_error_code krb5rc;
2563                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2564                         /*  krb5_data   krb5_ap_req;  */
2565                         krb5_data       *enc_ticket;
2566                         krb5_data       authenticator, *authp = NULL;
2567                         EVP_CIPHER_CTX  ciph_ctx;
2568                         const EVP_CIPHER *enc = NULL;
2569                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2570                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2571                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
2572                                                 + EVP_MAX_IV_LENGTH];
2573                         int             padl, outl = sizeof(epms);
2574
2575                         EVP_CIPHER_CTX_init(&ciph_ctx);
2576
2577 #ifdef KSSL_DEBUG
2578                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2579                                 alg_k, SSL_kKRB5);
2580 #endif  /* KSSL_DEBUG */
2581
2582                         authp = NULL;
2583 #ifdef KRB5SENDAUTH
2584                         if (KRB5SENDAUTH)  authp = &authenticator;
2585 #endif  /* KRB5SENDAUTH */
2586
2587                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2588                                 &kssl_err);
2589                         enc = kssl_map_enc(kssl_ctx->enctype);
2590                         if (enc == NULL)
2591                             goto err;
2592 #ifdef KSSL_DEBUG
2593                         {
2594                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2595                         if (krb5rc && kssl_err.text)
2596                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2597                         }
2598 #endif  /* KSSL_DEBUG */
2599
2600                         if (krb5rc)
2601                                 {
2602                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2603                                                 SSL_AD_HANDSHAKE_FAILURE);
2604                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2605                                                 kssl_err.reason);
2606                                 goto err;
2607                                 }
2608
2609                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2610                         **  in place of RFC 2712 KerberosWrapper, as in:
2611                         **
2612                         **  Send ticket (copy to *p, set n = length)
2613                         **  n = krb5_ap_req.length;
2614                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2615                         **  if (krb5_ap_req.data)  
2616                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2617                         **
2618                         **  Now using real RFC 2712 KerberosWrapper
2619                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2620                         **  Note: 2712 "opaque" types are here replaced
2621                         **  with a 2-byte length followed by the value.
2622                         **  Example:
2623                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2624                         **  Where "xx xx" = length bytes.  Shown here with
2625                         **  optional authenticator omitted.
2626                         */
2627
2628                         /*  KerberosWrapper.Ticket              */
2629                         s2n(enc_ticket->length,p);
2630                         memcpy(p, enc_ticket->data, enc_ticket->length);
2631                         p+= enc_ticket->length;
2632                         n = enc_ticket->length + 2;
2633
2634                         /*  KerberosWrapper.Authenticator       */
2635                         if (authp  &&  authp->length)  
2636                                 {
2637                                 s2n(authp->length,p);
2638                                 memcpy(p, authp->data, authp->length);
2639                                 p+= authp->length;
2640                                 n+= authp->length + 2;
2641                                 
2642                                 free(authp->data);
2643                                 authp->data = NULL;
2644                                 authp->length = 0;
2645                                 }
2646                         else
2647                                 {
2648                                 s2n(0,p);/*  null authenticator length  */
2649                                 n+=2;
2650                                 }
2651  
2652                             tmp_buf[0]=s->client_version>>8;
2653                             tmp_buf[1]=s->client_version&0xff;
2654                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2655                                 goto err;
2656
2657                         /*  20010420 VRS.  Tried it this way; failed.
2658                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2659                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2660                         **                              kssl_ctx->length);
2661                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2662                         */
2663
2664                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2665                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2666                                 kssl_ctx->key,iv);
2667                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2668                                 sizeof tmp_buf);
2669                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2670                         outl += padl;
2671                         if (outl > (int)sizeof epms)
2672                                 {
2673                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2674                                 goto err;
2675                                 }
2676                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2677
2678                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2679                         s2n(outl,p);
2680                         memcpy(p, epms, outl);
2681                         p+=outl;
2682                         n+=outl + 2;
2683
2684                         s->session->master_key_length=
2685                                 s->method->ssl3_enc->generate_master_secret(s,
2686                                         s->session->master_key,
2687                                         tmp_buf, sizeof tmp_buf);
2688
2689                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2690                         OPENSSL_cleanse(epms, outl);
2691                         }
2692 #endif
2693 #ifndef OPENSSL_NO_DH
2694                 else if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
2695                         {
2696                         DH *dh_srvr,*dh_clnt;
2697                         SESS_CERT *scert = s->session->sess_cert;
2698
2699                         if (scert == NULL) 
2700                                 {
2701                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2702                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2703                                 goto err;
2704                                 }
2705
2706                         if (scert->peer_dh_tmp != NULL)
2707                                 dh_srvr=scert->peer_dh_tmp;
2708                         else
2709                                 {
2710                                 /* we get them from the cert */
2711                                 int idx = scert->peer_cert_type;
2712                                 EVP_PKEY *spkey = NULL;
2713                                 dh_srvr = NULL;
2714                                 if (idx >= 0)
2715                                         spkey = X509_get_pubkey(
2716                                                 scert->peer_pkeys[idx].x509);
2717                                 if (spkey)
2718                                         {
2719                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2720                                         EVP_PKEY_free(spkey);
2721                                         }
2722                                 if (dh_srvr == NULL)
2723                                         {
2724                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2725                                             ERR_R_INTERNAL_ERROR);
2726                                         goto err;
2727                                         }
2728                                 }
2729                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2730                                 {
2731                                 /* Use client certificate key */
2732                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2733                                 dh_clnt = NULL;
2734                                 if (clkey)
2735                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2736                                 if (dh_clnt == NULL)
2737                                         {
2738                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2739                                             ERR_R_INTERNAL_ERROR);
2740                                         goto err;
2741                                         }
2742                                 }
2743                         else
2744                                 {
2745                                 /* generate a new random key */
2746                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2747                                         {
2748                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2749                                         goto err;
2750                                         }
2751                                 if (!DH_generate_key(dh_clnt))
2752                                         {
2753                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2754                                         DH_free(dh_clnt);
2755                                         goto err;
2756                                         }
2757                                 }
2758
2759                         /* use the 'p' output buffer for the DH key, but
2760                          * make sure to clear it out afterwards */
2761
2762                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2763                         if (scert->peer_dh_tmp == NULL)
2764                                 DH_free(dh_srvr);
2765
2766                         if (n <= 0)
2767                                 {
2768                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2769                                 DH_free(dh_clnt);
2770                                 goto err;
2771                                 }
2772
2773                         /* generate master key from the result */
2774                         s->session->master_key_length=
2775                                 s->method->ssl3_enc->generate_master_secret(s,
2776                                         s->session->master_key,p,n);
2777                         /* clean up */
2778                         memset(p,0,n);
2779
2780                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2781                                 n = 0;
2782                         else
2783                                 {
2784                                 /* send off the data */
2785                                 n=BN_num_bytes(dh_clnt->pub_key);
2786                                 s2n(n,p);
2787                                 BN_bn2bin(dh_clnt->pub_key,p);
2788                                 n+=2;
2789                                 }
2790
2791                         DH_free(dh_clnt);
2792
2793                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2794                         }
2795 #endif
2796
2797 #ifndef OPENSSL_NO_ECDH 
2798                 else if (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe))
2799                         {
2800                         const EC_GROUP *srvr_group = NULL;
2801                         EC_KEY *tkey;
2802                         int ecdh_clnt_cert = 0;
2803                         int field_size = 0;
2804
2805                         if (s->session->sess_cert == NULL) 
2806                                 {
2807                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2808                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2809                                 goto err;
2810                                 }
2811
2812                         /* Did we send out the client's
2813                          * ECDH share for use in premaster
2814                          * computation as part of client certificate?
2815                          * If so, set ecdh_clnt_cert to 1.
2816                          */
2817                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
2818                                 {
2819                                 /* XXX: For now, we do not support client
2820                                  * authentication using ECDH certificates.
2821                                  * To add such support, one needs to add
2822                                  * code that checks for appropriate 
2823                                  * conditions and sets ecdh_clnt_cert to 1.
2824                                  * For example, the cert have an ECC
2825                                  * key on the same curve as the server's
2826                                  * and the key should be authorized for
2827                                  * key agreement.
2828                                  *
2829                                  * One also needs to add code in ssl3_connect
2830                                  * to skip sending the certificate verify
2831                                  * message.
2832                                  *
2833                                  * if ((s->cert->key->privatekey != NULL) &&
2834                                  *     (s->cert->key->privatekey->type ==
2835                                  *      EVP_PKEY_EC) && ...)
2836                                  * ecdh_clnt_cert = 1;
2837                                  */
2838                                 }
2839
2840                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2841                                 {
2842                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2843                                 }
2844                         else
2845                                 {
2846                                 /* Get the Server Public Key from Cert */
2847                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2848                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2849                                 if ((srvr_pub_pkey == NULL) ||
2850                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2851                                     (srvr_pub_pkey->pkey.ec == NULL))
2852                                         {
2853                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2854                                             ERR_R_INTERNAL_ERROR);
2855                                         goto err;
2856                                         }
2857
2858                                 tkey = srvr_pub_pkey->pkey.ec;
2859                                 }
2860
2861                         srvr_group   = EC_KEY_get0_group(tkey);
2862                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2863
2864                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2865                                 {
2866                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2867                                     ERR_R_INTERNAL_ERROR);
2868                                 goto err;
2869                                 }
2870
2871                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
2872                                 {
2873                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2874                                 goto err;
2875                                 }
2876
2877                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2878                                 {
2879                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2880                                 goto err;
2881                                 }
2882                         if (ecdh_clnt_cert) 
2883                                 { 
2884                                 /* Reuse key info from our certificate
2885                                  * We only need our private key to perform
2886                                  * the ECDH computation.
2887                                  */
2888                                 const BIGNUM *priv_key;
2889                                 tkey = s->cert->key->privatekey->pkey.ec;
2890                                 priv_key = EC_KEY_get0_private_key(tkey);
2891                                 if (priv_key == NULL)
2892                                         {
2893                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2894                                         goto err;
2895                                         }
2896                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2897                                         {
2898                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2899                                         goto err;
2900                                         }
2901                                 }
2902                         else 
2903                                 {
2904                                 /* Generate a new ECDH key pair */
2905                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2906                                         {
2907                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2908                                         goto err;
2909                                         }
2910                                 }
2911
2912                         /* use the 'p' output buffer for the ECDH key, but
2913                          * make sure to clear it out afterwards
2914                          */
2915
2916                         field_size = EC_GROUP_get_degree(srvr_group);
2917                         if (field_size <= 0)
2918                                 {
2919                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2920                                        ERR_R_ECDH_LIB);
2921                                 goto err;
2922                                 }
2923                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2924                         if (n <= 0)
2925                                 {
2926                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2927                                        ERR_R_ECDH_LIB);
2928                                 goto err;
2929                                 }
2930
2931                         /* generate master key from the result */
2932                         s->session->master_key_length = s->method->ssl3_enc \
2933                             -> generate_master_secret(s, 
2934                                 s->session->master_key,
2935                                 p, n);
2936
2937                         memset(p, 0, n); /* clean up */
2938
2939                         if (ecdh_clnt_cert) 
2940                                 {
2941                                 /* Send empty client key exch message */
2942                                 n = 0;
2943                                 }
2944                         else 
2945                                 {
2946                                 /* First check the size of encoding and
2947                                  * allocate memory accordingly.
2948                                  */
2949                                 encoded_pt_len = 
2950                                     EC_POINT_point2oct(srvr_group, 
2951                                         EC_KEY_get0_public_key(clnt_ecdh), 
2952                                         POINT_CONVERSION_UNCOMPRESSED, 
2953                                         NULL, 0, NULL);
2954
2955                                 encodedPoint = (unsigned char *) 
2956                                     OPENSSL_malloc(encoded_pt_len * 
2957                                         sizeof(unsigned char)); 
2958                                 bn_ctx = BN_CTX_new();
2959                                 if ((encodedPoint == NULL) || 
2960                                     (bn_ctx == NULL)) 
2961                                         {
2962                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2963                                         goto err;
2964                                         }
2965
2966                                 /* Encode the public key */
2967                                 n = EC_POINT_point2oct(srvr_group, 
2968                                     EC_KEY_get0_public_key(clnt_ecdh), 
2969                                     POINT_CONVERSION_UNCOMPRESSED, 
2970                                     encodedPoint, encoded_pt_len, bn_ctx);
2971
2972                                 *p = n; /* length of encoded point */
2973                                 /* Encoded point will be copied here */
2974                                 p += 1; 
2975                                 /* copy the point */
2976                                 memcpy((unsigned char *)p, encodedPoint, n);
2977                                 /* increment n to account for length field */
2978                                 n += 1; 
2979                                 }
2980
2981                         /* Free allocated memory */
2982                         BN_CTX_free(bn_ctx);
2983                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2984                         if (clnt_ecdh != NULL) 
2985                                  EC_KEY_free(clnt_ecdh);
2986                         EVP_PKEY_free(srvr_pub_pkey);
2987                         }
2988 #endif /* !OPENSSL_NO_ECDH */
2989                 else if (alg_k & SSL_kGOST) 
2990                         {
2991                         /* GOST key exchange message creation */
2992                         EVP_PKEY_CTX *pkey_ctx;
2993                         X509 *peer_cert; 
2994                         size_t msglen;
2995                         unsigned int md_len;
2996                         int keytype;
2997                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2998                         EVP_MD_CTX *ukm_hash;
2999                         EVP_PKEY *pub_key;
3000
3001                         /* Get server sertificate PKEY and create ctx from it */
3002                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
3003                         if (!peer_cert) 
3004                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
3005                         if (!peer_cert)         {
3006                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
3007                                         goto err;
3008                                 }       
3009                                 
3010                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
3011                         /* If we have send a certificate, and certificate key
3012
3013                          * parameters match those of server certificate, use
3014                          * certificate key for key exchange
3015                          */
3016
3017                          /* Otherwise, generate ephemeral key pair */
3018                                         
3019                         EVP_PKEY_encrypt_init(pkey_ctx);
3020                           /* Generate session key */    
3021                     RAND_bytes(premaster_secret,32);
3022                         /* If we have client certificate, use its secret as peer key */
3023                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
3024                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
3025                                         /* If there was an error - just ignore it. Ephemeral key
3026                                         * would be used
3027                                         */
3028                                         ERR_clear_error();
3029                                 }
3030                         }                       
3031                         /* Compute shared IV and store it in algorithm-specific
3032                          * context data */
3033                         ukm_hash = EVP_MD_CTX_create();
3034                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
3035                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
3036                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
3037                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
3038                         EVP_MD_CTX_destroy(ukm_hash);
3039                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
3040                                 8,shared_ukm)<0) {
3041                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3042                                                 SSL_R_LIBRARY_BUG);
3043                                         goto err;
3044                                 }       
3045                         /* Make GOST keytransport blob message */
3046                         /*Encapsulate it into sequence */
3047                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
3048                         msglen=255;
3049                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
3050                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3051                                         SSL_R_LIBRARY_BUG);
3052                                 goto err;
3053                         }
3054                         if (msglen >= 0x80)
3055                                 {
3056                                 *(p++)=0x81;
3057                                 *(p++)= msglen & 0xff;
3058                                 n=msglen+3;
3059                                 }
3060                         else
3061                                 {
3062                                 *(p++)= msglen & 0xff;
3063                                 n=msglen+2;
3064                                 }
3065                         memcpy(p, tmp, msglen);
3066                         /* Check if pubkey from client certificate was used */
3067                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
3068                                 {
3069                                 /* Set flag "skip certificate verify" */
3070                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3071                                 }
3072                         EVP_PKEY_CTX_free(pkey_ctx);
3073                         s->session->master_key_length=
3074                                 s->method->ssl3_enc->generate_master_secret(s,
3075                                         s->session->master_key,premaster_secret,32);
3076                         EVP_PKEY_free(pub_key);
3077
3078                         }
3079 #ifndef OPENSSL_NO_SRP
3080                 else if (alg_k & SSL_kSRP)
3081                         {
3082                         if (s->srp_ctx.A != NULL)
3083                                 {
3084                                 /* send off the data */
3085                                 n=BN_num_bytes(s->srp_ctx.A);
3086                                 s2n(n,p);
3087                                 BN_bn2bin(s->srp_ctx.A,p);
3088                                 n+=2;
3089                                 }
3090                         else
3091                                 {
3092                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3093                                 goto err;
3094                                 }
3095                         if (s->session->srp_username != NULL)
3096                                 OPENSSL_free(s->session->srp_username);
3097                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3098                         if (s->session->srp_username == NULL)
3099                                 {
3100                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3101                                         ERR_R_MALLOC_FAILURE);
3102                                 goto err;
3103                                 }
3104
3105                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3106                                 {
3107                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3108                                 goto err;
3109                                 }
3110                         }
3111 #endif
3112 #ifndef OPENSSL_NO_PSK
3113                 else if (alg_k & SSL_kPSK)
3114                         {
3115                         /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes
3116                          * to return a \0-terminated identity. The last byte
3117                          * is for us for simulating strnlen. */
3118                         char identity[PSK_MAX_IDENTITY_LEN + 2];
3119                         size_t identity_len;
3120                         unsigned char *t = NULL;
3121                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3122                         unsigned int pre_ms_len = 0, psk_len = 0;
3123                         int psk_err = 1;
3124
3125                         n = 0;
3126                         if (s->psk_client_callback == NULL)
3127                                 {
3128                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3129                                         SSL_R_PSK_NO_CLIENT_CB);
3130                                 goto err;
3131                                 }
3132
3133                         memset(identity, 0, sizeof(identity));
3134                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3135                                 identity, sizeof(identity) - 1,
3136                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3137                         if (psk_len > PSK_MAX_PSK_LEN)
3138                                 {
3139                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3140                                         ERR_R_INTERNAL_ERROR);
3141                                 goto psk_err;
3142                                 }
3143                         else if (psk_len == 0)
3144                                 {
3145                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3146                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3147                                 goto psk_err;
3148                                 }
3149                         identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
3150                         identity_len = strlen(identity);
3151                         if (identity_len > PSK_MAX_IDENTITY_LEN)
3152                                 {
3153                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3154                                         ERR_R_INTERNAL_ERROR);
3155                                 goto psk_err;
3156                                 }
3157                         /* create PSK pre_master_secret */
3158                         pre_ms_len = 2+psk_len+2+psk_len;
3159                         t = psk_or_pre_ms;
3160                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3161                         s2n(psk_len, t);
3162                         memset(t, 0, psk_len);
3163                         t+=psk_len;
3164                         s2n(psk_len, t);
3165
3166                         if (s->session->psk_identity_hint != NULL)
3167                                 OPENSSL_free(s->session->psk_identity_hint);
3168                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3169                         if (s->ctx->psk_identity_hint != NULL &&
3170                                 s->session->psk_identity_hint == NULL)
3171                                 {
3172                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3173                                         ERR_R_MALLOC_FAILURE);
3174                                 goto psk_err;
3175                                 }
3176
3177                         if (s->session->psk_identity != NULL)
3178                                 OPENSSL_free(s->session->psk_identity);
3179                         s->session->psk_identity = BUF_strdup(identity);
3180                         if (s->session->psk_identity == NULL)
3181                                 {
3182                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3183                                         ERR_R_MALLOC_FAILURE);
3184                                 goto psk_err;
3185                                 }
3186
3187                         s->session->master_key_length =
3188                                 s->method->ssl3_enc->generate_master_secret(s,
3189                                         s->session->master_key,
3190                                         psk_or_pre_ms, pre_ms_len);
3191                         s2n(identity_len, p);
3192                         memcpy(p, identity, identity_len);
3193                         n = 2 + identity_len;
3194                         psk_err = 0;
3195                 psk_err:
3196                         OPENSSL_cleanse(identity, sizeof(identity));
3197                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3198                         if (psk_err != 0)
3199                                 {
3200                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3201                                 goto err;
3202                                 }
3203                         }
3204 #endif
3205                 else
3206                         {
3207                         ssl3_send_alert(s, SSL3_AL_FATAL,
3208                             SSL_AD_HANDSHAKE_FAILURE);
3209                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3210                             ERR_R_INTERNAL_ERROR);
3211                         goto err;
3212                         }
3213
3214                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3215                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3216                 }
3217
3218         /* SSL3_ST_CW_KEY_EXCH_B */
3219         return ssl_do_write(s);
3220 err:
3221 #ifndef OPENSSL_NO_ECDH
3222         BN_CTX_free(bn_ctx);
3223         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3224         if (clnt_ecdh != NULL) 
3225                 EC_KEY_free(clnt_ecdh);
3226         EVP_PKEY_free(srvr_pub_pkey);
3227 #endif
3228         return(-1);
3229         }
3230
3231 int ssl3_send_client_verify(SSL *s)
3232         {
3233         unsigned char *p;
3234         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3235         EVP_PKEY *pkey;
3236         EVP_PKEY_CTX *pctx=NULL;
3237         EVP_MD_CTX mctx;
3238         unsigned u=0;
3239         unsigned long n;
3240         int j;
3241
3242         EVP_MD_CTX_init(&mctx);
3243
3244         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3245                 {
3246                 p= ssl_handshake_start(s);
3247                 pkey=s->cert->key->privatekey;
3248 /* Create context from key and test if sha1 is allowed as digest */
3249                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3250                 EVP_PKEY_sign_init(pctx);
3251                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3252                         {
3253                         if (!SSL_USE_SIGALGS(s))
3254                                 s->method->ssl3_enc->cert_verify_mac(s,
3255                                                 NID_sha1,
3256                                                 &(data[MD5_DIGEST_LENGTH]));
3257                         }
3258                 else
3259                         {
3260                         ERR_clear_error();
3261                         }
3262                 /* For TLS v1.2 send signature algorithm and signature
3263                  * using agreed digest and cached handshake records.
3264                  */
3265                 if (SSL_USE_SIGALGS(s))
3266                         {
3267                         long hdatalen = 0;
3268                         void *hdata;
3269                         const EVP_MD *md = s->cert->key->digest;
3270                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3271                                                                 &hdata);
3272                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3273                                 {
3274                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3275                                                 ERR_R_INTERNAL_ERROR);
3276                                 goto err;
3277                                 }
3278                         p += 2;
3279 #ifdef SSL_DEBUG
3280                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3281                                                         EVP_MD_name(md));
3282 #endif
3283                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3284                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3285                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3286                                 {
3287                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3288                                                 ERR_R_EVP_LIB);
3289                                 goto err;
3290                                 }
3291                         s2n(u,p);
3292                         n = u + 4;
3293                         if (!ssl3_digest_cached_records(s))
3294                                 goto err;
3295                         }
3296                 else
3297 #ifndef OPENSSL_NO_RSA
3298                 if (pkey->type == EVP_PKEY_RSA)
3299                         {
3300                         s->method->ssl3_enc->cert_verify_mac(s,
3301                                 NID_md5,
3302                                 &(data[0]));
3303                         if (RSA_sign(NID_md5_sha1, data,
3304                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3305                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3306                                 {
3307                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3308                                 goto err;
3309                                 }
3310                         s2n(u,p);
3311                         n=u+2;
3312                         }
3313                 else
3314 #endif
3315 #ifndef OPENSSL_NO_DSA
3316                         if (pkey->type == EVP_PKEY_DSA)
3317                         {
3318                         if (!DSA_sign(pkey->save_type,
3319                                 &(data[MD5_DIGEST_LENGTH]),
3320                                 SHA_DIGEST_LENGTH,&(p[2]),
3321                                 (unsigned int *)&j,pkey->pkey.dsa))
3322                                 {
3323                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3324                                 goto err;
3325                                 }
3326                         s2n(j,p);
3327                         n=j+2;
3328                         }
3329                 else
3330 #endif
3331 #ifndef OPENSSL_NO_ECDSA
3332                         if (pkey->type == EVP_PKEY_EC)
3333                         {
3334                         if (!ECDSA_sign(pkey->save_type,
3335                                 &(data[MD5_DIGEST_LENGTH]),
3336                                 SHA_DIGEST_LENGTH,&(p[2]),
3337                                 (unsigned int *)&j,pkey->pkey.ec))
3338                                 {
3339                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3340                                     ERR_R_ECDSA_LIB);
3341                                 goto err;
3342                                 }
3343                         s2n(j,p);
3344                         n=j+2;
3345                         }
3346                 else
3347 #endif
3348                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) 
3349                 {
3350                 unsigned char signbuf[64];
3351                 int i;
3352                 size_t sigsize=64;
3353                 s->method->ssl3_enc->cert_verify_mac(s,
3354                         NID_id_GostR3411_94,
3355                         data);
3356                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3357                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3358                         ERR_R_INTERNAL_ERROR);
3359                         goto err;
3360                 }
3361                 for (i=63,j=0; i>=0; j++, i--) {
3362                         p[2+j]=signbuf[i];
3363                 }       
3364                 s2n(j,p);
3365                 n=j+2;
3366                 }
3367                 else
3368                 {
3369                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3370                         goto err;
3371                 }
3372                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3373                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3374                 }
3375         EVP_MD_CTX_cleanup(&mctx);
3376         EVP_PKEY_CTX_free(pctx);
3377         return ssl_do_write(s);
3378 err:
3379         EVP_MD_CTX_cleanup(&mctx);
3380         EVP_PKEY_CTX_free(pctx);
3381         return(-1);
3382         }
3383
3384 /* Check a certificate can be used for client authentication. Currently
3385  * check cert exists, if we have a suitable digest for TLS 1.2 if
3386  * static DH client certificates can be used and optionally checks
3387  * suitability for Suite B.
3388  */
3389 static int ssl3_check_client_certificate(SSL *s)
3390         {
3391         unsigned long alg_k;
3392         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3393                 return 0;
3394         /* If no suitable signature algorithm can't use certificate */
3395         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3396                 return 0;
3397         /* If strict mode check suitability of chain before using it.
3398          * This also adjusts suite B digest if necessary.
3399          */
3400         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3401                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3402                 return 0;
3403         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3404         /* See if we can use client certificate for fixed DH */
3405         if (alg_k & (SSL_kDHr|SSL_kDHd))
3406                 {
3407                 SESS_CERT *scert = s->session->sess_cert;
3408                 int i = scert->peer_cert_type;
3409                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3410                 clkey = s->cert->key->privatekey;
3411                 /* If client key not DH assume it can be used */
3412                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3413                         return 1;
3414                 if (i >= 0)
3415                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3416                 if (spkey)
3417                         {
3418                         /* Compare server and client parameters */
3419                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3420                         EVP_PKEY_free(spkey);
3421                         if (i != 1)
3422                                 return 0;
3423                         }
3424                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3425                 }
3426         return 1;
3427         }
3428
3429 int ssl3_send_client_certificate(SSL *s)
3430         {
3431         X509 *x509=NULL;
3432         EVP_PKEY *pkey=NULL;
3433         int i;
3434
3435         if (s->state == SSL3_ST_CW_CERT_A)
3436                 {
3437                 /* Let cert callback update client certificates if required */
3438                 if (s->cert->cert_cb)
3439                         {
3440                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3441                         if (i < 0)
3442                                 {
3443                                 s->rwstate=SSL_X509_LOOKUP;
3444                                 return -1;
3445                                 }
3446                         if (i == 0)
3447                                 {
3448                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3449                                 return 0;
3450                                 }
3451                         s->rwstate=SSL_NOTHING;
3452                         }
3453                 if (ssl3_check_client_certificate(s))
3454                         s->state=SSL3_ST_CW_CERT_C;