ssl3_get_certificate_request: check for NULL after allocating s->cert->ctypes
[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 #ifndef OPENSSL_NO_DH
160 #include <openssl/dh.h>
161 #endif
162 #include <openssl/bn.h>
163 #ifndef OPENSSL_NO_ENGINE
164 #include <openssl/engine.h>
165 #endif
166
167 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
168
169 #ifndef OPENSSL_NO_SSL3_METHOD
170 static const SSL_METHOD *ssl3_get_client_method(int ver)
171         {
172         if (ver == SSL3_VERSION)
173                 return(SSLv3_client_method());
174         else
175                 return(NULL);
176         }
177
178 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
179                         ssl_undefined_function,
180                         ssl3_connect,
181                         ssl3_get_client_method)
182 #endif
183
184 int ssl3_connect(SSL *s)
185         {
186         BUF_MEM *buf=NULL;
187         unsigned long Time=(unsigned long)time(NULL);
188         void (*cb)(const SSL *ssl,int type,int val)=NULL;
189         int ret= -1;
190         int new_state,state,skip=0;
191
192         RAND_add(&Time,sizeof(Time),0);
193         ERR_clear_error();
194         clear_sys_error();
195
196         if (s->info_callback != NULL)
197                 cb=s->info_callback;
198         else if (s->ctx->info_callback != NULL)
199                 cb=s->ctx->info_callback;
200         
201         s->in_handshake++;
202         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
203
204 #ifndef OPENSSL_NO_HEARTBEATS
205         /* If we're awaiting a HeartbeatResponse, pretend we
206          * already got and don't await it anymore, because
207          * Heartbeats don't make sense during handshakes anyway.
208          */
209         if (s->tlsext_hb_pending)
210                 {
211                 s->tlsext_hb_pending = 0;
212                 s->tlsext_hb_seq++;
213                 }
214 #endif
215
216         for (;;)
217                 {
218                 state=s->state;
219
220                 switch(s->state)
221                         {
222                 case SSL_ST_RENEGOTIATE:
223                         s->renegotiate=1;
224                         s->state=SSL_ST_CONNECT;
225                         s->ctx->stats.sess_connect_renegotiate++;
226                         /* break */
227                 case SSL_ST_BEFORE:
228                 case SSL_ST_CONNECT:
229                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
230                 case SSL_ST_OK|SSL_ST_CONNECT:
231
232                         s->server=0;
233                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
234
235                         if ((s->version & 0xff00 ) != 0x0300)
236                                 {
237                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
238                                 ret = -1;
239                                 goto end;
240                                 }
241
242                         if (!ssl_security(s, SSL_SECOP_VERSION, 0,
243                                                         s->version, NULL))
244                                 {
245                                 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
246                                 return -1;
247                                 }
248                                 
249                         /* s->version=SSL3_VERSION; */
250                         s->type=SSL_ST_CONNECT;
251
252                         if (s->init_buf == NULL)
253                                 {
254                                 if ((buf=BUF_MEM_new()) == NULL)
255                                         {
256                                         ret= -1;
257                                         goto end;
258                                         }
259                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
260                                         {
261                                         ret= -1;
262                                         goto end;
263                                         }
264                                 s->init_buf=buf;
265                                 buf=NULL;
266                                 }
267
268                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
269
270                         /* setup buffing BIO */
271                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
272
273                         /* don't push the buffering BIO quite yet */
274
275                         ssl3_init_finished_mac(s);
276
277                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
278                         s->ctx->stats.sess_connect++;
279                         s->init_num=0;
280                         s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
281                         /* Should have been reset by ssl3_get_finished, too. */
282                         s->s3->change_cipher_spec = 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                                 }
432                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
433                                 {
434                                 s->state=SSL3_ST_CW_CHANGE_A;
435                                 }
436
437                         s->init_num=0;
438                         break;
439
440                 case SSL3_ST_CW_CERT_VRFY_A:
441                 case SSL3_ST_CW_CERT_VRFY_B:
442                         ret=ssl3_send_client_verify(s);
443                         if (ret <= 0) goto end;
444                         s->state=SSL3_ST_CW_CHANGE_A;
445                         s->init_num=0;
446                         break;
447
448                 case SSL3_ST_CW_CHANGE_A:
449                 case SSL3_ST_CW_CHANGE_B:
450                         ret=ssl3_send_change_cipher_spec(s,
451                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
452                         if (ret <= 0) goto end;
453
454 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
455                         s->state=SSL3_ST_CW_FINISHED_A;
456 #else
457                         if (s->s3->next_proto_neg_seen)
458                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
459                         else
460                                 s->state=SSL3_ST_CW_FINISHED_A;
461 #endif
462                         s->init_num=0;
463
464                         s->session->cipher=s->s3->tmp.new_cipher;
465 #ifdef OPENSSL_NO_COMP
466                         s->session->compress_meth=0;
467 #else
468                         if (s->s3->tmp.new_compression == NULL)
469                                 s->session->compress_meth=0;
470                         else
471                                 s->session->compress_meth=
472                                         s->s3->tmp.new_compression->id;
473 #endif
474                         if (!s->method->ssl3_enc->setup_key_block(s))
475                                 {
476                                 ret= -1;
477                                 goto end;
478                                 }
479
480                         if (!s->method->ssl3_enc->change_cipher_state(s,
481                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
482                                 {
483                                 ret= -1;
484                                 goto end;
485                                 }
486
487                         break;
488
489 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
490                 case SSL3_ST_CW_NEXT_PROTO_A:
491                 case SSL3_ST_CW_NEXT_PROTO_B:
492                         ret=ssl3_send_next_proto(s);
493                         if (ret <= 0) goto end;
494                         s->state=SSL3_ST_CW_FINISHED_A;
495                         break;
496 #endif
497
498                 case SSL3_ST_CW_FINISHED_A:
499                 case SSL3_ST_CW_FINISHED_B:
500                         ret=ssl3_send_finished(s,
501                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
502                                 s->method->ssl3_enc->client_finished_label,
503                                 s->method->ssl3_enc->client_finished_label_len);
504                         if (ret <= 0) goto end;
505                         s->state=SSL3_ST_CW_FLUSH;
506
507                         /* clear flags */
508                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
509                         if (s->hit)
510                                 {
511                                 s->s3->tmp.next_state=SSL_ST_OK;
512                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
513                                         {
514                                         s->state=SSL_ST_OK;
515                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
516                                         s->s3->delay_buf_pop_ret=0;
517                                         }
518                                 }
519                         else
520                                 {
521 #ifndef OPENSSL_NO_TLSEXT
522                                 /* Allow NewSessionTicket if ticket expected */
523                                 if (s->tlsext_ticket_expected)
524                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
525                                 else
526 #endif
527                                 
528                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
529                                 }
530                         s->init_num=0;
531                         break;
532
533 #ifndef OPENSSL_NO_TLSEXT
534                 case SSL3_ST_CR_SESSION_TICKET_A:
535                 case SSL3_ST_CR_SESSION_TICKET_B:
536                         ret=ssl3_get_new_session_ticket(s);
537                         if (ret <= 0) goto end;
538                         s->state=SSL3_ST_CR_FINISHED_A;
539                         s->init_num=0;
540                 break;
541
542                 case SSL3_ST_CR_CERT_STATUS_A:
543                 case SSL3_ST_CR_CERT_STATUS_B:
544                         ret=ssl3_get_cert_status(s);
545                         if (ret <= 0) goto end;
546                         s->state=SSL3_ST_CR_KEY_EXCH_A;
547                         s->init_num=0;
548                 break;
549 #endif
550
551                 case SSL3_ST_CR_FINISHED_A:
552                 case SSL3_ST_CR_FINISHED_B:
553                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
554                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
555                                 SSL3_ST_CR_FINISHED_B);
556                         if (ret <= 0) goto end;
557
558                         if (s->hit)
559                                 s->state=SSL3_ST_CW_CHANGE_A;
560                         else
561                                 s->state=SSL_ST_OK;
562                         s->init_num=0;
563                         break;
564
565                 case SSL3_ST_CW_FLUSH:
566                         s->rwstate=SSL_WRITING;
567                         if (BIO_flush(s->wbio) <= 0)
568                                 {
569                                 ret= -1;
570                                 goto end;
571                                 }
572                         s->rwstate=SSL_NOTHING;
573                         s->state=s->s3->tmp.next_state;
574                         break;
575
576                 case SSL_ST_OK:
577                         /* clean a few things up */
578                         ssl3_cleanup_key_block(s);
579
580                         if (s->init_buf != NULL)
581                                 {
582                                 BUF_MEM_free(s->init_buf);
583                                 s->init_buf=NULL;
584                                 }
585
586                         /* If we are not 'joining' the last two packets,
587                          * remove the buffering now */
588                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
589                                 ssl_free_wbio_buffer(s);
590                         /* else do it later in ssl3_write */
591
592                         s->init_num=0;
593                         s->renegotiate=0;
594                         s->new_session=0;
595
596                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
597                         if (s->hit) s->ctx->stats.sess_hit++;
598
599                         ret=1;
600                         /* s->server=0; */
601                         s->handshake_func=ssl3_connect;
602                         s->ctx->stats.sess_connect_good++;
603
604                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
605
606                         goto end;
607                         /* break; */
608                         
609                 default:
610                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
611                         ret= -1;
612                         goto end;
613                         /* break; */
614                         }
615
616                 /* did we do anything */
617                 if (!s->s3->tmp.reuse_message && !skip)
618                         {
619                         if (s->debug)
620                                 {
621                                 if ((ret=BIO_flush(s->wbio)) <= 0)
622                                         goto end;
623                                 }
624
625                         if ((cb != NULL) && (s->state != state))
626                                 {
627                                 new_state=s->state;
628                                 s->state=state;
629                                 cb(s,SSL_CB_CONNECT_LOOP,1);
630                                 s->state=new_state;
631                                 }
632                         }
633                 skip=0;
634                 }
635 end:
636         s->in_handshake--;
637         if (buf != NULL)
638                 BUF_MEM_free(buf);
639         if (cb != NULL)
640                 cb(s,SSL_CB_CONNECT_EXIT,ret);
641         return(ret);
642         }
643
644
645 int ssl3_client_hello(SSL *s)
646         {
647         unsigned char *buf;
648         unsigned char *p,*d;
649         int i;
650         unsigned long l;
651         int al = 0;
652 #ifndef OPENSSL_NO_COMP
653         int j;
654         SSL_COMP *comp;
655 #endif
656
657         buf=(unsigned char *)s->init_buf->data;
658         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
659                 {
660                 SSL_SESSION *sess = s->session;
661                 if ((sess == NULL) ||
662                         (sess->ssl_version != s->version) ||
663                         !sess->session_id_length ||
664                         (sess->not_resumable))
665                         {
666                         if (!ssl_get_new_session(s,0))
667                                 goto err;
668                         }
669                 if (s->method->version == DTLS_ANY_VERSION)
670                         {
671                         /* Determine which DTLS version to use */
672                         int options = s->options;
673                         /* If DTLS 1.2 disabled correct the version number */
674                         if (options & SSL_OP_NO_DTLSv1_2)
675                                 {
676                                 if (tls1_suiteb(s))
677                                         {
678                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
679                                         goto err;
680                                         }
681                                 /* Disabling all versions is silly: return an
682                                  * error.
683                                  */
684                                 if (options & SSL_OP_NO_DTLSv1)
685                                         {
686                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
687                                         goto err;
688                                         }
689                                 /* Update method so we don't use any DTLS 1.2
690                                  * features.
691                                  */
692                                 s->method = DTLSv1_client_method();
693                                 s->version = DTLS1_VERSION;
694                                 }
695                         else
696                                 {
697                                 /* We only support one version: update method */
698                                 if (options & SSL_OP_NO_DTLSv1)
699                                         s->method = DTLSv1_2_client_method();
700                                 s->version = DTLS1_2_VERSION;
701                                 }
702                         s->client_version = s->version;
703                         }
704                 /* else use the pre-loaded session */
705
706                 p=s->s3->client_random;
707
708                 /* for DTLS if client_random is initialized, reuse it, we are
709                  * required to use same upon reply to HelloVerify */
710                 if (SSL_IS_DTLS(s))
711                         {
712                         size_t idx;
713                         i = 1;
714                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
715                                 {
716                                 if (p[idx])
717                                         {
718                                         i = 0;
719                                         break;
720                                         }
721                                 }
722                         }
723                 else 
724                         i = 1;
725
726                 if (i)
727                         ssl_fill_hello_random(s, 0, p,
728                                               sizeof(s->s3->client_random));
729
730                 /* Do the message type and length last */
731                 d=p= ssl_handshake_start(s);
732
733                 /* version indicates the negotiated version: for example from
734                  * an SSLv2/v3 compatible client hello). The client_version
735                  * field is the maximum version we permit and it is also
736                  * used in RSA encrypted premaster secrets. Some servers can
737                  * choke if we initially report a higher version then
738                  * renegotiate to a lower one in the premaster secret. This
739                  * didn't happen with TLS 1.0 as most servers supported it
740                  * but it can with TLS 1.1 or later if the server only supports
741                  * 1.0.
742                  *
743                  * Possible scenario with previous logic:
744                  *      1. Client hello indicates TLS 1.2
745                  *      2. Server hello says TLS 1.0
746                  *      3. RSA encrypted premaster secret uses 1.2.
747                  *      4. Handhaked proceeds using TLS 1.0.
748                  *      5. Server sends hello request to renegotiate.
749                  *      6. Client hello indicates TLS v1.0 as we now
750                  *         know that is maximum server supports.
751                  *      7. Server chokes on RSA encrypted premaster secret
752                  *         containing version 1.0.
753                  *
754                  * For interoperability it should be OK to always use the
755                  * maximum version we support in client hello and then rely
756                  * on the checking of version to ensure the servers isn't
757                  * being inconsistent: for example initially negotiating with
758                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
759                  * client_version in client hello and not resetting it to
760                  * the negotiated version.
761                  */
762 #if 0
763                 *(p++)=s->version>>8;
764                 *(p++)=s->version&0xff;
765                 s->client_version=s->version;
766 #else
767                 *(p++)=s->client_version>>8;
768                 *(p++)=s->client_version&0xff;
769 #endif
770
771                 /* Random stuff */
772                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
773                 p+=SSL3_RANDOM_SIZE;
774
775                 /* Session ID */
776                 if (s->new_session)
777                         i=0;
778                 else
779                         i=s->session->session_id_length;
780                 *(p++)=i;
781                 if (i != 0)
782                         {
783                         if (i > (int)sizeof(s->session->session_id))
784                                 {
785                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
786                                 goto err;
787                                 }
788                         memcpy(p,s->session->session_id,i);
789                         p+=i;
790                         }
791                 
792                 /* cookie stuff for DTLS */
793                 if (SSL_IS_DTLS(s))
794                         {
795                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
796                                 {
797                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
798                                 goto err;
799                                 }
800                         *(p++) = s->d1->cookie_len;
801                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
802                         p += s->d1->cookie_len;
803                         }
804                 
805                 /* Ciphers supported */
806                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
807                 if (i == 0)
808                         {
809                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
810                         goto err;
811                         }
812 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
813                         /* Some servers hang if client hello > 256 bytes
814                          * as hack workaround chop number of supported ciphers
815                          * to keep it well below this if we use TLS v1.2
816                          */
817                         if (TLS1_get_version(s) >= TLS1_2_VERSION
818                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
819                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
820 #endif
821                 s2n(i,p);
822                 p+=i;
823
824                 /* COMPRESSION */
825 #ifdef OPENSSL_NO_COMP
826                 *(p++)=1;
827 #else
828
829                 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
830                         j=0;
831                 else
832                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
833                 *(p++)=1+j;
834                 for (i=0; i<j; i++)
835                         {
836                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
837                         *(p++)=comp->id;
838                         }
839 #endif
840                 *(p++)=0; /* Add the NULL method */
841
842 #ifndef OPENSSL_NO_TLSEXT
843                 /* TLS extensions*/
844                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
845                         {
846                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
847                         goto err;
848                         }
849                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
850                         {
851                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
852                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
853                         goto err;
854                         }
855 #endif
856                 
857                 l= p-d;
858                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
859                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
860                 }
861
862         /* SSL3_ST_CW_CLNT_HELLO_B */
863         return ssl_do_write(s);
864 err:
865         return(-1);
866         }
867
868 int ssl3_get_server_hello(SSL *s)
869         {
870         STACK_OF(SSL_CIPHER) *sk;
871         const SSL_CIPHER *c;
872         CERT *ct = s->cert;
873         unsigned char *p,*d;
874         int i,al=SSL_AD_INTERNAL_ERROR,ok;
875         unsigned int j;
876         long n;
877 #ifndef OPENSSL_NO_COMP
878         SSL_COMP *comp;
879 #endif
880         /* Hello verify request and/or server hello version may not
881          * match so set first packet if we're negotiating version.
882          */
883         if (SSL_IS_DTLS(s))
884                 s->first_packet = 1;
885
886         n=s->method->ssl_get_message(s,
887                 SSL3_ST_CR_SRVR_HELLO_A,
888                 SSL3_ST_CR_SRVR_HELLO_B,
889                 -1,
890                 20000, /* ?? */
891                 &ok);
892
893         if (!ok) return((int)n);
894
895         if (SSL_IS_DTLS(s))
896                 {
897                 s->first_packet = 0;
898                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
899                         {
900                         if ( s->d1->send_cookie == 0)
901                                 {
902                                 s->s3->tmp.reuse_message = 1;
903                                 return 1;
904                                 }
905                         else /* already sent a cookie */
906                                 {
907                                 al=SSL_AD_UNEXPECTED_MESSAGE;
908                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
909                                 goto f_err;
910                                 }
911                         }
912                 }
913         
914         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
915                 {
916                 al=SSL_AD_UNEXPECTED_MESSAGE;
917                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
918                 goto f_err;
919                 }
920
921         d=p=(unsigned char *)s->init_msg;
922         if (s->method->version == DTLS_ANY_VERSION)
923                 {
924                 /* Work out correct protocol version to use */
925                 int hversion = (p[0] << 8)|p[1];
926                 int options = s->options;
927                 if (hversion == DTLS1_2_VERSION
928                         && !(options & SSL_OP_NO_DTLSv1_2))
929                         s->method = DTLSv1_2_client_method();
930                 else if (tls1_suiteb(s))
931                         {
932                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
933                         s->version = hversion;
934                         al = SSL_AD_PROTOCOL_VERSION;
935                         goto f_err;
936                         }
937                 else if (hversion == DTLS1_VERSION
938                         && !(options & SSL_OP_NO_DTLSv1))
939                         s->method = DTLSv1_client_method();
940                 else
941                         {
942                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
943                         s->version = hversion;
944                         al = SSL_AD_PROTOCOL_VERSION;
945                         goto f_err;
946                         }
947                 s->version = s->client_version = s->method->version;
948                 }
949
950         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
951                 {
952                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
953                 s->version=(s->version&0xff00)|p[1];
954                 al=SSL_AD_PROTOCOL_VERSION;
955                 goto f_err;
956                 }
957         p+=2;
958
959         /* load the server hello data */
960         /* load the server random */
961         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
962         p+=SSL3_RANDOM_SIZE;
963
964         s->hit = 0;
965
966         /* get the session-id */
967         j= *(p++);
968
969         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
970                 {
971                 al=SSL_AD_ILLEGAL_PARAMETER;
972                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
973                 goto f_err;
974                 }
975
976 #ifndef OPENSSL_NO_TLSEXT
977         /* check if we want to resume the session based on external pre-shared secret */
978         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
979                 {
980                 SSL_CIPHER *pref_cipher=NULL;
981                 s->session->master_key_length=sizeof(s->session->master_key);
982                 if (s->tls_session_secret_cb(s, s->session->master_key,
983                                              &s->session->master_key_length,
984                                              NULL, &pref_cipher,
985                                              s->tls_session_secret_cb_arg))
986                         {
987                         s->session->cipher = pref_cipher ?
988                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
989                         s->hit = 1;
990                         }
991                 }
992 #endif /* OPENSSL_NO_TLSEXT */
993
994         if (!s->hit && j != 0 && j == s->session->session_id_length
995             && memcmp(p,s->session->session_id,j) == 0)
996             {
997             if(s->sid_ctx_length != s->session->sid_ctx_length
998                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
999                 {
1000                 /* actually a client application bug */
1001                 al=SSL_AD_ILLEGAL_PARAMETER;
1002                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1003                 goto f_err;
1004                 }
1005             s->hit=1;
1006             }
1007         /* a miss or crap from the other end */
1008         if (!s->hit)
1009                 {
1010                 /* If we were trying for session-id reuse, make a new
1011                  * SSL_SESSION so we don't stuff up other people */
1012                 if (s->session->session_id_length > 0)
1013                         {
1014                         if (!ssl_get_new_session(s,0))
1015                                 {
1016                                 goto f_err;
1017                                 }
1018                         }
1019                 s->session->session_id_length=j;
1020                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1021                 }
1022         p+=j;
1023         c=ssl_get_cipher_by_char(s,p);
1024         if (c == NULL)
1025                 {
1026                 /* unknown cipher */
1027                 al=SSL_AD_ILLEGAL_PARAMETER;
1028                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1029                 goto f_err;
1030                 }
1031         /* Set version disabled mask now we know version */
1032         if (!SSL_USE_TLS1_2_CIPHERS(s))
1033                 ct->mask_ssl = SSL_TLSV1_2;
1034         else
1035                 ct->mask_ssl = 0;
1036         /* If it is a disabled cipher we didn't send it in client hello,
1037          * so return an error.
1038          */
1039         if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK))
1040                 {
1041                 al=SSL_AD_ILLEGAL_PARAMETER;
1042                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1043                 goto f_err;
1044                 }
1045         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1046
1047         sk=ssl_get_ciphers_by_id(s);
1048         i=sk_SSL_CIPHER_find(sk,c);
1049         if (i < 0)
1050                 {
1051                 /* we did not say we would use this cipher */
1052                 al=SSL_AD_ILLEGAL_PARAMETER;
1053                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1054                 goto f_err;
1055                 }
1056
1057         /* Depending on the session caching (internal/external), the cipher
1058            and/or cipher_id values may not be set. Make sure that
1059            cipher_id is set and use it for comparison. */
1060         if (s->session->cipher)
1061                 s->session->cipher_id = s->session->cipher->id;
1062         if (s->hit && (s->session->cipher_id != c->id))
1063                 {
1064 /* Workaround is now obsolete */
1065 #if 0
1066                 if (!(s->options &
1067                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1068 #endif
1069                         {
1070                         al=SSL_AD_ILLEGAL_PARAMETER;
1071                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1072                         goto f_err;
1073                         }
1074                 }
1075         s->s3->tmp.new_cipher=c;
1076         /* Don't digest cached records if no sigalgs: we may need them for
1077          * client authentication.
1078          */
1079         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1080                 goto f_err;
1081         /* lets get the compression algorithm */
1082         /* COMPRESSION */
1083 #ifdef OPENSSL_NO_COMP
1084         if (*(p++) != 0)
1085                 {
1086                 al=SSL_AD_ILLEGAL_PARAMETER;
1087                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1088                 goto f_err;
1089                 }
1090         /* If compression is disabled we'd better not try to resume a session
1091          * using compression.
1092          */
1093         if (s->session->compress_meth != 0)
1094                 {
1095                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1096                 goto f_err;
1097                 }
1098 #else
1099         j= *(p++);
1100         if (s->hit && j != s->session->compress_meth)
1101                 {
1102                 al=SSL_AD_ILLEGAL_PARAMETER;
1103                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1104                 goto f_err;
1105                 }
1106         if (j == 0)
1107                 comp=NULL;
1108         else if (!ssl_allow_compression(s))
1109                 {
1110                 al=SSL_AD_ILLEGAL_PARAMETER;
1111                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1112                 goto f_err;
1113                 }
1114         else
1115                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1116         
1117         if ((j != 0) && (comp == NULL))
1118                 {
1119                 al=SSL_AD_ILLEGAL_PARAMETER;
1120                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1121                 goto f_err;
1122                 }
1123         else
1124                 {
1125                 s->s3->tmp.new_compression=comp;
1126                 }
1127 #endif
1128
1129 #ifndef OPENSSL_NO_TLSEXT
1130         /* TLS extensions*/
1131         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1132                 {
1133                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1134                 goto err; 
1135                 }
1136 #endif
1137
1138         if (p != (d+n))
1139                 {
1140                 /* wrong packet length */
1141                 al=SSL_AD_DECODE_ERROR;
1142                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1143                 goto f_err;
1144                 }
1145
1146         return(1);
1147 f_err:
1148         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1149 err:
1150         return(-1);
1151         }
1152
1153 int ssl3_get_server_certificate(SSL *s)
1154         {
1155         int al,i,ok,ret= -1;
1156         unsigned long n,nc,llen,l;
1157         X509 *x=NULL;
1158         const unsigned char *q,*p;
1159         unsigned char *d;
1160         STACK_OF(X509) *sk=NULL;
1161         SESS_CERT *sc;
1162         EVP_PKEY *pkey=NULL;
1163         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1164
1165         n=s->method->ssl_get_message(s,
1166                 SSL3_ST_CR_CERT_A,
1167                 SSL3_ST_CR_CERT_B,
1168                 -1,
1169                 s->max_cert_list,
1170                 &ok);
1171
1172         if (!ok) return((int)n);
1173
1174         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1175                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 
1176                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1177                 {
1178                 s->s3->tmp.reuse_message=1;
1179                 return(1);
1180                 }
1181
1182         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1183                 {
1184                 al=SSL_AD_UNEXPECTED_MESSAGE;
1185                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1186                 goto f_err;
1187                 }
1188         p=d=(unsigned char *)s->init_msg;
1189
1190         if ((sk=sk_X509_new_null()) == NULL)
1191                 {
1192                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1193                 goto err;
1194                 }
1195
1196         n2l3(p,llen);
1197         if (llen+3 != n)
1198                 {
1199                 al=SSL_AD_DECODE_ERROR;
1200                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1201                 goto f_err;
1202                 }
1203         for (nc=0; nc<llen; )
1204                 {
1205                 n2l3(p,l);
1206                 if ((l+nc+3) > llen)
1207                         {
1208                         al=SSL_AD_DECODE_ERROR;
1209                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1210                         goto f_err;
1211                         }
1212
1213                 q=p;
1214                 x=d2i_X509(NULL,&q,l);
1215                 if (x == NULL)
1216                         {
1217                         al=SSL_AD_BAD_CERTIFICATE;
1218                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1219                         goto f_err;
1220                         }
1221                 if (q != (p+l))
1222                         {
1223                         al=SSL_AD_DECODE_ERROR;
1224                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1225                         goto f_err;
1226                         }
1227                 if (!sk_X509_push(sk,x))
1228                         {
1229                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1230                         goto err;
1231                         }
1232                 x=NULL;
1233                 nc+=l+3;
1234                 p=q;
1235                 }
1236
1237         i=ssl_verify_cert_chain(s,sk);
1238         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1239 #ifndef OPENSSL_NO_KRB5
1240             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1241                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1242 #endif /* OPENSSL_NO_KRB5 */
1243                 )
1244                 {
1245                 al=ssl_verify_alarm_type(s->verify_result);
1246                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1247                 goto f_err; 
1248                 }
1249         ERR_clear_error(); /* but we keep s->verify_result */
1250         if (i > 1)
1251                 {
1252                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1253                 al = SSL_AD_HANDSHAKE_FAILURE;
1254                 goto f_err;
1255                 }
1256
1257         sc=ssl_sess_cert_new();
1258         if (sc == NULL) goto err;
1259
1260         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1261         s->session->sess_cert=sc;
1262
1263         sc->cert_chain=sk;
1264         /* Inconsistency alert: cert_chain does include the peer's
1265          * certificate, which we don't include in s3_srvr.c */
1266         x=sk_X509_value(sk,0);
1267         sk=NULL;
1268         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1269
1270         pkey=X509_get_pubkey(x);
1271
1272         /* VRS: allow null cert if auth == KRB5 */
1273         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1274                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1275                     ? 0 : 1;
1276
1277 #ifdef KSSL_DEBUG
1278         printf("pkey,x = %p, %p\n", pkey,x);
1279         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1280         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1281                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1282 #endif    /* KSSL_DEBUG */
1283
1284         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1285                 {
1286                 x=NULL;
1287                 al=SSL3_AL_FATAL;
1288                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1289                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1290                 goto f_err;
1291                 }
1292
1293         i=ssl_cert_type(x,pkey);
1294         if (need_cert && i < 0)
1295                 {
1296                 x=NULL;
1297                 al=SSL3_AL_FATAL;
1298                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1299                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1300                 goto f_err;
1301                 }
1302
1303         if (need_cert)
1304                 {
1305                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1306                 if (exp_idx >= 0 && i != exp_idx)
1307                         {
1308                         x=NULL;
1309                         al=SSL_AD_ILLEGAL_PARAMETER;
1310                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1311                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1312                         goto f_err;
1313                         }
1314                 sc->peer_cert_type=i;
1315                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1316                 /* Why would the following ever happen?
1317                  * We just created sc a couple of lines ago. */
1318                 if (sc->peer_pkeys[i].x509 != NULL)
1319                         X509_free(sc->peer_pkeys[i].x509);
1320                 sc->peer_pkeys[i].x509=x;
1321                 sc->peer_key= &(sc->peer_pkeys[i]);
1322
1323                 if (s->session->peer != NULL)
1324                         X509_free(s->session->peer);
1325                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1326                 s->session->peer=x;
1327                 }
1328         else
1329                 {
1330                 sc->peer_cert_type=i;
1331                 sc->peer_key= NULL;
1332
1333                 if (s->session->peer != NULL)
1334                         X509_free(s->session->peer);
1335                 s->session->peer=NULL;
1336                 }
1337         s->session->verify_result = s->verify_result;
1338
1339         x=NULL;
1340         ret=1;
1341         if (0)
1342                 {
1343 f_err:
1344                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1345                 }
1346 err:
1347         EVP_PKEY_free(pkey);
1348         X509_free(x);
1349         sk_X509_pop_free(sk,X509_free);
1350         return(ret);
1351         }
1352
1353 int ssl3_get_key_exchange(SSL *s)
1354         {
1355 #ifndef OPENSSL_NO_RSA
1356         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1357 #endif
1358         EVP_MD_CTX md_ctx;
1359         unsigned char *param,*p;
1360         int al,j,ok;
1361         long i,param_len,n,alg_k,alg_a;
1362         EVP_PKEY *pkey=NULL;
1363         const EVP_MD *md = NULL;
1364 #ifndef OPENSSL_NO_RSA
1365         RSA *rsa=NULL;
1366 #endif
1367 #ifndef OPENSSL_NO_DH
1368         DH *dh=NULL;
1369 #endif
1370 #ifndef OPENSSL_NO_ECDH
1371         EC_KEY *ecdh = NULL;
1372         BN_CTX *bn_ctx = NULL;
1373         EC_POINT *srvr_ecpoint = NULL;
1374         int curve_nid = 0;
1375         int encoded_pt_len = 0;
1376 #endif
1377
1378         /* use same message size as in ssl3_get_certificate_request()
1379          * as ServerKeyExchange message may be skipped */
1380         n=s->method->ssl_get_message(s,
1381                 SSL3_ST_CR_KEY_EXCH_A,
1382                 SSL3_ST_CR_KEY_EXCH_B,
1383                 -1,
1384                 s->max_cert_list,
1385                 &ok);
1386         if (!ok) return((int)n);
1387
1388         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1389                 {
1390 #ifndef OPENSSL_NO_PSK
1391                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1392                    omitted if no identity hint is sent. Set
1393                    session->sess_cert anyway to avoid problems
1394                    later.*/
1395                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1396                         {
1397                         s->session->sess_cert=ssl_sess_cert_new();
1398                         if (s->ctx->psk_identity_hint)
1399                                 OPENSSL_free(s->ctx->psk_identity_hint);
1400                         s->ctx->psk_identity_hint = NULL;
1401                         }
1402 #endif
1403                 s->s3->tmp.reuse_message=1;
1404                 return(1);
1405                 }
1406
1407         param=p=(unsigned char *)s->init_msg;
1408         if (s->session->sess_cert != NULL)
1409                 {
1410 #ifndef OPENSSL_NO_RSA
1411                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1412                         {
1413                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1414                         s->session->sess_cert->peer_rsa_tmp=NULL;
1415                         }
1416 #endif
1417 #ifndef OPENSSL_NO_DH
1418                 if (s->session->sess_cert->peer_dh_tmp)
1419                         {
1420                         DH_free(s->session->sess_cert->peer_dh_tmp);
1421                         s->session->sess_cert->peer_dh_tmp=NULL;
1422                         }
1423 #endif
1424 #ifndef OPENSSL_NO_ECDH
1425                 if (s->session->sess_cert->peer_ecdh_tmp)
1426                         {
1427                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1428                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1429                         }
1430 #endif
1431                 }
1432         else
1433                 {
1434                 s->session->sess_cert=ssl_sess_cert_new();
1435                 }
1436
1437         /* Total length of the parameters including the length prefix */
1438         param_len=0;
1439
1440         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1441         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1442         EVP_MD_CTX_init(&md_ctx);
1443
1444         al=SSL_AD_DECODE_ERROR;
1445
1446 #ifndef OPENSSL_NO_PSK
1447         if (alg_k & SSL_kPSK)
1448                 {
1449                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1450
1451                 param_len = 2;
1452                 if (param_len > n)
1453                         {
1454                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1455                                 SSL_R_LENGTH_TOO_SHORT);
1456                         goto f_err;
1457                         }
1458                 n2s(p,i);
1459
1460                 /* Store PSK identity hint for later use, hint is used
1461                  * in ssl3_send_client_key_exchange.  Assume that the
1462                  * maximum length of a PSK identity hint can be as
1463                  * long as the maximum length of a PSK identity. */
1464                 if (i > PSK_MAX_IDENTITY_LEN)
1465                         {
1466                         al=SSL_AD_HANDSHAKE_FAILURE;
1467                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1468                                 SSL_R_DATA_LENGTH_TOO_LONG);
1469                         goto f_err;
1470                         }
1471                 if (i > n - param_len)
1472                         {
1473                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1474                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1475                         goto f_err;
1476                         }
1477                 param_len += i;
1478
1479                 /* If received PSK identity hint contains NULL
1480                  * characters, the hint is truncated from the first
1481                  * NULL. p may not be ending with NULL, so create a
1482                  * NULL-terminated string. */
1483                 memcpy(tmp_id_hint, p, i);
1484                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1485                 if (s->ctx->psk_identity_hint != NULL)
1486                         OPENSSL_free(s->ctx->psk_identity_hint);
1487                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1488                 if (s->ctx->psk_identity_hint == NULL)
1489                         {
1490                         al=SSL_AD_HANDSHAKE_FAILURE;
1491                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1492                         goto f_err;
1493                         }          
1494
1495                 p+=i;
1496                 n-=param_len;
1497                 }
1498         else
1499 #endif /* !OPENSSL_NO_PSK */
1500 #ifndef OPENSSL_NO_SRP
1501         if (alg_k & SSL_kSRP)
1502                 {
1503                 param_len = 2;
1504                 if (param_len > n)
1505                         {
1506                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1507                                 SSL_R_LENGTH_TOO_SHORT);
1508                         goto f_err;
1509                         }
1510                 n2s(p,i);
1511
1512                 if (i > n - param_len)
1513                         {
1514                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1515                         goto f_err;
1516                         }
1517                 param_len += i;
1518
1519                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1520                         {
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1522                         goto err;
1523                         }
1524                 p+=i;
1525
1526
1527                 if (2 > n - param_len)
1528                         {
1529                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1530                                 SSL_R_LENGTH_TOO_SHORT);
1531                         goto f_err;
1532                         }
1533                 param_len += 2;
1534
1535                 n2s(p,i);
1536
1537                 if (i > n - param_len)
1538                         {
1539                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1540                         goto f_err;
1541                         }
1542                 param_len += i;
1543
1544                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1545                         {
1546                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1547                         goto err;
1548                         }
1549                 p+=i;
1550
1551
1552                 if (1 > n - param_len)
1553                         {
1554                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1555                                 SSL_R_LENGTH_TOO_SHORT);
1556                         goto f_err;
1557                         }
1558                 param_len += 1;
1559
1560                 i = (unsigned int)(p[0]);
1561                 p++;
1562
1563                 if (i > n - param_len)
1564                         {
1565                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1566                         goto f_err;
1567                         }
1568                 param_len += i;
1569
1570                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1571                         {
1572                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1573                         goto err;
1574                         }
1575                 p+=i;
1576
1577                 if (2 > n - param_len)
1578                         {
1579                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1580                                 SSL_R_LENGTH_TOO_SHORT);
1581                         goto f_err;
1582                         }
1583                 param_len += 2;
1584
1585                 n2s(p,i);
1586
1587                 if (i > n - param_len)
1588                         {
1589                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1590                         goto f_err;
1591                         }
1592                 param_len += i;
1593
1594                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1595                         {
1596                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1597                         goto err;
1598                         }
1599                 p+=i;
1600                 n-=param_len;
1601
1602                 if (!srp_verify_server_param(s, &al))
1603                         {
1604                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1605                         goto f_err;
1606                         }
1607
1608 /* We must check if there is a certificate */
1609 #ifndef OPENSSL_NO_RSA
1610                 if (alg_a & SSL_aRSA)
1611                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1612 #else
1613                 if (0)
1614                         ;
1615 #endif
1616 #ifndef OPENSSL_NO_DSA
1617                 else if (alg_a & SSL_aDSS)
1618                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1619 #endif
1620                 }
1621         else
1622 #endif /* !OPENSSL_NO_SRP */
1623 #ifndef OPENSSL_NO_RSA
1624         if (alg_k & SSL_kRSA)
1625                 {
1626                 if ((rsa=RSA_new()) == NULL)
1627                         {
1628                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1629                         goto err;
1630                         }
1631
1632                 param_len = 2;
1633                 if (param_len > n)
1634                         {
1635                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1636                                 SSL_R_LENGTH_TOO_SHORT);
1637                         goto f_err;
1638                         }
1639                 n2s(p,i);
1640
1641                 if (i > n - param_len)
1642                         {
1643                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1644                         goto f_err;
1645                         }
1646                 param_len += i;
1647
1648                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1649                         {
1650                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1651                         goto err;
1652                         }
1653                 p+=i;
1654
1655                 if (2 > n - param_len)
1656                         {
1657                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1658                                 SSL_R_LENGTH_TOO_SHORT);
1659                         goto f_err;
1660                         }
1661                 param_len += 2;
1662
1663                 n2s(p,i);
1664
1665                 if (i > n - param_len)
1666                         {
1667                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1668                         goto f_err;
1669                         }
1670                 param_len += i;
1671
1672                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1673                         {
1674                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1675                         goto err;
1676                         }
1677                 p+=i;
1678                 n-=param_len;
1679
1680                 /* this should be because we are using an export cipher */
1681                 if (alg_a & SSL_aRSA)
1682                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1683                 else
1684                         {
1685                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1686                         goto err;
1687                         }
1688                 s->session->sess_cert->peer_rsa_tmp=rsa;
1689                 rsa=NULL;
1690                 }
1691 #else /* OPENSSL_NO_RSA */
1692         if (0)
1693                 ;
1694 #endif
1695 #ifndef OPENSSL_NO_DH
1696         else if (alg_k & SSL_kDHE)
1697                 {
1698                 if ((dh=DH_new()) == NULL)
1699                         {
1700                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1701                         goto err;
1702                         }
1703
1704                 param_len = 2;
1705                 if (param_len > n)
1706                         {
1707                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1708                                 SSL_R_LENGTH_TOO_SHORT);
1709                         goto f_err;
1710                         }
1711                 n2s(p,i);
1712
1713                 if (i > n - param_len)
1714                         {
1715                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1716                         goto f_err;
1717                         }
1718                 param_len += i;
1719
1720                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1721                         {
1722                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1723                         goto err;
1724                         }
1725                 p+=i;
1726
1727                 if (2 > n - param_len)
1728                         {
1729                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1730                                 SSL_R_LENGTH_TOO_SHORT);
1731                         goto f_err;
1732                         }
1733                 param_len += 2;
1734
1735                 n2s(p,i);
1736
1737                 if (i > n - param_len)
1738                         {
1739                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1740                         goto f_err;
1741                         }
1742                 param_len += i;
1743
1744                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1745                         {
1746                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1747                         goto err;
1748                         }
1749                 p+=i;
1750
1751                 if (2 > n - param_len)
1752                         {
1753                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1754                                 SSL_R_LENGTH_TOO_SHORT);
1755                         goto f_err;
1756                         }
1757                 param_len += 2;
1758
1759                 n2s(p,i);
1760
1761                 if (i > n - param_len)
1762                         {
1763                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1764                         goto f_err;
1765                         }
1766                 param_len += i;
1767
1768                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1769                         {
1770                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1771                         goto err;
1772                         }
1773                 p+=i;
1774                 n-=param_len;
1775
1776                 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1777                                                 DH_security_bits(dh), 0, dh))
1778                         {
1779                         al=SSL_AD_HANDSHAKE_FAILURE;
1780                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_DH_KEY_TOO_SMALL);
1781                         goto f_err;
1782                         }
1783
1784 #ifndef OPENSSL_NO_RSA
1785                 if (alg_a & SSL_aRSA)
1786                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1787 #else
1788                 if (0)
1789                         ;
1790 #endif
1791 #ifndef OPENSSL_NO_DSA
1792                 else if (alg_a & SSL_aDSS)
1793                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1794 #endif
1795                 /* else anonymous DH, so no certificate or pkey. */
1796
1797                 s->session->sess_cert->peer_dh_tmp=dh;
1798                 dh=NULL;
1799                 }
1800         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1801                 {
1802                 al=SSL_AD_ILLEGAL_PARAMETER;
1803                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1804                 goto f_err;
1805                 }
1806 #endif /* !OPENSSL_NO_DH */
1807
1808 #ifndef OPENSSL_NO_ECDH
1809         else if (alg_k & SSL_kECDHE)
1810                 {
1811                 EC_GROUP *ngroup;
1812                 const EC_GROUP *group;
1813
1814                 if ((ecdh=EC_KEY_new()) == NULL)
1815                         {
1816                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1817                         goto err;
1818                         }
1819
1820                 /* Extract elliptic curve parameters and the
1821                  * server's ephemeral ECDH public key.
1822                  * Keep accumulating lengths of various components in
1823                  * param_len and make sure it never exceeds n.
1824                  */
1825
1826                 /* XXX: For now we only support named (not generic) curves
1827                  * and the ECParameters in this case is just three bytes. We
1828                  * also need one byte for the length of the encoded point
1829                  */
1830                 param_len=4;
1831                 if (param_len > n)
1832                         {
1833                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1834                                 SSL_R_LENGTH_TOO_SHORT);
1835                         goto f_err;
1836                         }
1837                 /* Check curve is one of our preferences, if not server has
1838                  * sent an invalid curve. ECParameters is 3 bytes.
1839                  */
1840                 if (!tls1_check_curve(s, p, 3))
1841                         {
1842                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1843                         goto f_err;
1844                         }
1845
1846                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) 
1847                         {
1848                         al=SSL_AD_INTERNAL_ERROR;
1849                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1850                         goto f_err;
1851                         }
1852
1853                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1854                 if (ngroup == NULL)
1855                         {
1856                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1857                         goto err;
1858                         }
1859                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1860                         {
1861                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1862                         goto err;
1863                         }
1864                 EC_GROUP_free(ngroup);
1865
1866                 group = EC_KEY_get0_group(ecdh);
1867
1868                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1869                     (EC_GROUP_get_degree(group) > 163))
1870                         {
1871                         al=SSL_AD_EXPORT_RESTRICTION;
1872                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1873                         goto f_err;
1874                         }
1875
1876                 p+=3;
1877
1878                 /* Next, get the encoded ECPoint */
1879                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1880                     ((bn_ctx = BN_CTX_new()) == NULL))
1881                         {
1882                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1883                         goto err;
1884                         }
1885
1886                 encoded_pt_len = *p;  /* length of encoded point */
1887                 p+=1;
1888
1889                 if ((encoded_pt_len > n - param_len) ||
1890                     (EC_POINT_oct2point(group, srvr_ecpoint, 
1891                         p, encoded_pt_len, bn_ctx) == 0))
1892                         {
1893                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1894                         goto f_err;
1895                         }
1896                 param_len += encoded_pt_len;
1897
1898                 n-=param_len;
1899                 p+=encoded_pt_len;
1900
1901                 /* The ECC/TLS specification does not mention
1902                  * the use of DSA to sign ECParameters in the server
1903                  * key exchange message. We do support RSA and ECDSA.
1904                  */
1905                 if (0) ;
1906 #ifndef OPENSSL_NO_RSA
1907                 else if (alg_a & SSL_aRSA)
1908                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1909 #endif
1910 #ifndef OPENSSL_NO_ECDSA
1911                 else if (alg_a & SSL_aECDSA)
1912                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1913 #endif
1914                 /* else anonymous ECDH, so no certificate or pkey. */
1915                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1916                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1917                 ecdh=NULL;
1918                 BN_CTX_free(bn_ctx);
1919                 bn_ctx = NULL;
1920                 EC_POINT_free(srvr_ecpoint);
1921                 srvr_ecpoint = NULL;
1922                 }
1923         else if (alg_k)
1924                 {
1925                 al=SSL_AD_UNEXPECTED_MESSAGE;
1926                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1927                 goto f_err;
1928                 }
1929 #endif /* !OPENSSL_NO_ECDH */
1930
1931
1932         /* p points to the next byte, there are 'n' bytes left */
1933
1934         /* if it was signed, check the signature */
1935         if (pkey != NULL)
1936                 {
1937                 if (SSL_USE_SIGALGS(s))
1938                         {
1939                         int rv;
1940                         if (2 > n)
1941                                 {
1942                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1943                                         SSL_R_LENGTH_TOO_SHORT);
1944                                 goto f_err;
1945                                 }
1946                         rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1947                         if (rv == -1)
1948                                 goto err;
1949                         else if (rv == 0)
1950                                 {
1951                                 goto f_err;
1952                                 }
1953 #ifdef SSL_DEBUG
1954 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1955 #endif
1956                         p += 2;
1957                         n -= 2;
1958                         }
1959                 else
1960                         md = EVP_sha1();
1961
1962                 if (2 > n)
1963                         {
1964                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1965                                 SSL_R_LENGTH_TOO_SHORT);
1966                         goto f_err;
1967                         }
1968                 n2s(p,i);
1969                 n-=2;
1970                 j=EVP_PKEY_size(pkey);
1971
1972                 /* Check signature length. If n is 0 then signature is empty */
1973                 if ((i != n) || (n > j) || (n <= 0))
1974                         {
1975                         /* wrong packet length */
1976                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1977                         goto f_err;
1978                         }
1979
1980 #ifndef OPENSSL_NO_RSA
1981                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1982                         {
1983                         int num;
1984                         unsigned int size;
1985
1986                         j=0;
1987                         q=md_buf;
1988                         for (num=2; num > 0; num--)
1989                                 {
1990                                 EVP_MD_CTX_set_flags(&md_ctx,
1991                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1992                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1993                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1994                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1995                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1996                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1997                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
1998                                 q+=size;
1999                                 j+=size;
2000                                 }
2001                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
2002                                                                 pkey->pkey.rsa);
2003                         if (i < 0)
2004                                 {
2005                                 al=SSL_AD_DECRYPT_ERROR;
2006                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
2007                                 goto f_err;
2008                                 }
2009                         if (i == 0)
2010                                 {
2011                                 /* bad signature */
2012                                 al=SSL_AD_DECRYPT_ERROR;
2013                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2014                                 goto f_err;
2015                                 }
2016                         }
2017                 else
2018 #endif
2019                         {
2020                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
2021                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2022                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2023                         EVP_VerifyUpdate(&md_ctx,param,param_len);
2024                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
2025                                 {
2026                                 /* bad signature */
2027                                 al=SSL_AD_DECRYPT_ERROR;
2028                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2029                                 goto f_err;
2030                                 }
2031                         }
2032                 }
2033         else
2034                 {
2035                 /* aNULL, aSRP or kPSK do not need public keys */
2036                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
2037                         {
2038                         /* Might be wrong key type, check it */
2039                         if (ssl3_check_cert_and_algorithm(s))
2040                                 /* Otherwise this shouldn't happen */
2041                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2042                         goto err;
2043                         }
2044                 /* still data left over */
2045                 if (n != 0)
2046                         {
2047                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
2048                         goto f_err;
2049                         }
2050                 }
2051         EVP_PKEY_free(pkey);
2052         EVP_MD_CTX_cleanup(&md_ctx);
2053         return(1);
2054 f_err:
2055         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2056 err:
2057         EVP_PKEY_free(pkey);
2058 #ifndef OPENSSL_NO_RSA
2059         if (rsa != NULL)
2060                 RSA_free(rsa);
2061 #endif
2062 #ifndef OPENSSL_NO_DH
2063         if (dh != NULL)
2064                 DH_free(dh);
2065 #endif
2066 #ifndef OPENSSL_NO_ECDH
2067         BN_CTX_free(bn_ctx);
2068         EC_POINT_free(srvr_ecpoint);
2069         if (ecdh != NULL)
2070                 EC_KEY_free(ecdh);
2071 #endif
2072         EVP_MD_CTX_cleanup(&md_ctx);
2073         return(-1);
2074         }
2075
2076 int ssl3_get_certificate_request(SSL *s)
2077         {
2078         int ok,ret=0;
2079         unsigned long n,nc,l;
2080         unsigned int llen, ctype_num,i;
2081         X509_NAME *xn=NULL;
2082         const unsigned char *p,*q;
2083         unsigned char *d;
2084         STACK_OF(X509_NAME) *ca_sk=NULL;
2085
2086         n=s->method->ssl_get_message(s,
2087                 SSL3_ST_CR_CERT_REQ_A,
2088                 SSL3_ST_CR_CERT_REQ_B,
2089                 -1,
2090                 s->max_cert_list,
2091                 &ok);
2092
2093         if (!ok) return((int)n);
2094
2095         s->s3->tmp.cert_req=0;
2096
2097         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2098                 {
2099                 s->s3->tmp.reuse_message=1;
2100                 /* If we get here we don't need any cached handshake records
2101                  * as we wont be doing client auth.
2102                  */
2103                 if (s->s3->handshake_buffer)
2104                         {
2105                         if (!ssl3_digest_cached_records(s))
2106                                 goto err;
2107                         }
2108                 return(1);
2109                 }
2110
2111         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2112                 {
2113                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2114                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2115                 goto err;
2116                 }
2117
2118         /* TLS does not like anon-DH with client cert */
2119         if (s->version > SSL3_VERSION)
2120                 {
2121                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2122                         {
2123                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2124                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2125                         goto err;
2126                         }
2127                 }
2128
2129         p=d=(unsigned char *)s->init_msg;
2130
2131         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2132                 {
2133                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2134                 goto err;
2135                 }
2136
2137         /* get the certificate types */
2138         ctype_num= *(p++);
2139         if (s->cert->ctypes)
2140                 {
2141                 OPENSSL_free(s->cert->ctypes);
2142                 s->cert->ctypes = NULL;
2143                 }
2144         if (ctype_num > SSL3_CT_NUMBER)
2145                 {
2146                 /* If we exceed static buffer copy all to cert structure */
2147                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2148                 if (s->cert->ctypes == NULL)
2149                         {
2150                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2151                         goto err;
2152                         }
2153                 memcpy(s->cert->ctypes, p, ctype_num);
2154                 s->cert->ctype_num = (size_t)ctype_num;
2155                 ctype_num=SSL3_CT_NUMBER;
2156                 }
2157         for (i=0; i<ctype_num; i++)
2158                 s->s3->tmp.ctype[i]= p[i];
2159         p+=p[-1];
2160         if (SSL_USE_SIGALGS(s))
2161                 {
2162                 n2s(p, llen);
2163                 /* Check we have enough room for signature algorithms and
2164                  * following length value.
2165                  */
2166                 if ((unsigned long)(p - d + llen + 2) > n)
2167                         {
2168                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2169                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2170                         goto err;
2171                         }
2172                 /* Clear certificate digests and validity flags */
2173                 for (i = 0; i < SSL_PKEY_NUM; i++)
2174                         {
2175                         s->cert->pkeys[i].digest = NULL;
2176                         s->cert->pkeys[i].valid_flags = 0;
2177                         }
2178                 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen))
2179                         {
2180                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2181                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2182                         goto err;
2183                         }
2184                 if (!tls1_process_sigalgs(s))
2185                         {
2186                         ssl3_send_alert(s,SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2187                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2188                         goto err;
2189                         }
2190                 p += llen;
2191                 }
2192
2193         /* get the CA RDNs */
2194         n2s(p,llen);
2195 #if 0
2196 {
2197 FILE *out;
2198 out=fopen("/tmp/vsign.der","w");
2199 fwrite(p,1,llen,out);
2200 fclose(out);
2201 }
2202 #endif
2203
2204         if ((unsigned long)(p - d + llen) != n)
2205                 {
2206                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2207                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2208                 goto err;
2209                 }
2210
2211         for (nc=0; nc<llen; )
2212                 {
2213                 n2s(p,l);
2214                 if ((l+nc+2) > llen)
2215                         {
2216                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2217                                 goto cont; /* netscape bugs */
2218                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2219                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2220                         goto err;
2221                         }
2222
2223                 q=p;
2224
2225                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2226                         {
2227                         /* If netscape tolerance is on, ignore errors */
2228                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2229                                 goto cont;
2230                         else
2231                                 {
2232                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2233                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2234                                 goto err;
2235                                 }
2236                         }
2237
2238                 if (q != (p+l))
2239                         {
2240                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2241                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2242                         goto err;
2243                         }
2244                 if (!sk_X509_NAME_push(ca_sk,xn))
2245                         {
2246                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2247                         goto err;
2248                         }
2249
2250                 p+=l;
2251                 nc+=l+2;
2252                 }
2253
2254         if (0)
2255                 {
2256 cont:
2257                 ERR_clear_error();
2258                 }
2259
2260         /* we should setup a certificate to return.... */
2261         s->s3->tmp.cert_req=1;
2262         s->s3->tmp.ctype_num=ctype_num;
2263         if (s->s3->tmp.ca_names != NULL)
2264                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2265         s->s3->tmp.ca_names=ca_sk;
2266         ca_sk=NULL;
2267
2268         ret=1;
2269 err:
2270         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2271         return(ret);
2272         }
2273
2274 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2275         {
2276         return(X509_NAME_cmp(*a,*b));
2277         }
2278 #ifndef OPENSSL_NO_TLSEXT
2279 int ssl3_get_new_session_ticket(SSL *s)
2280         {
2281         int ok,al,ret=0, ticklen;
2282         long n;
2283         const unsigned char *p;
2284         unsigned char *d;
2285
2286         n=s->method->ssl_get_message(s,
2287                 SSL3_ST_CR_SESSION_TICKET_A,
2288                 SSL3_ST_CR_SESSION_TICKET_B,
2289                 SSL3_MT_NEWSESSION_TICKET,
2290                 16384,
2291                 &ok);
2292
2293         if (!ok)
2294                 return((int)n);
2295
2296         if (n < 6)
2297                 {
2298                 /* need at least ticket_lifetime_hint + ticket length */
2299                 al = SSL_AD_DECODE_ERROR;
2300                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2301                 goto f_err;
2302                 }
2303
2304         p=d=(unsigned char *)s->init_msg;
2305         n2l(p, s->session->tlsext_tick_lifetime_hint);
2306         n2s(p, ticklen);
2307         /* ticket_lifetime_hint + ticket_length + ticket */
2308         if (ticklen + 6 != n)
2309                 {
2310                 al = SSL_AD_DECODE_ERROR;
2311                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2312                 goto f_err;
2313                 }
2314         if (s->session->tlsext_tick)
2315                 {
2316                 OPENSSL_free(s->session->tlsext_tick);
2317                 s->session->tlsext_ticklen = 0;
2318                 }
2319         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2320         if (!s->session->tlsext_tick)
2321                 {
2322                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2323                 goto err;
2324                 }
2325         memcpy(s->session->tlsext_tick, p, ticklen);
2326         s->session->tlsext_ticklen = ticklen;
2327         /* There are two ways to detect a resumed ticket session.
2328          * One is to set an appropriate session ID and then the server
2329          * must return a match in ServerHello. This allows the normal
2330          * client session ID matching to work and we know much 
2331          * earlier that the ticket has been accepted.
2332          * 
2333          * The other way is to set zero length session ID when the
2334          * ticket is presented and rely on the handshake to determine
2335          * session resumption.
2336          *
2337          * We choose the former approach because this fits in with
2338          * assumptions elsewhere in OpenSSL. The session ID is set
2339          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2340          * ticket.
2341          */ 
2342         EVP_Digest(p, ticklen,
2343                         s->session->session_id, &s->session->session_id_length,
2344 #ifndef OPENSSL_NO_SHA256
2345                                                         EVP_sha256(), NULL);
2346 #else
2347                                                         EVP_sha1(), NULL);
2348 #endif
2349         ret=1;
2350         return(ret);
2351 f_err:
2352         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2353 err:
2354         return(-1);
2355         }
2356
2357 int ssl3_get_cert_status(SSL *s)
2358         {
2359         int ok, al;
2360         unsigned long resplen,n;
2361         const unsigned char *p;
2362
2363         n=s->method->ssl_get_message(s,
2364                 SSL3_ST_CR_CERT_STATUS_A,
2365                 SSL3_ST_CR_CERT_STATUS_B,
2366                 SSL3_MT_CERTIFICATE_STATUS,
2367                 16384,
2368                 &ok);
2369
2370         if (!ok) return((int)n);
2371         if (n < 4)
2372                 {
2373                 /* need at least status type + length */
2374                 al = SSL_AD_DECODE_ERROR;
2375                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2376                 goto f_err;
2377                 }
2378         p = (unsigned char *)s->init_msg;
2379         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2380                 {
2381                 al = SSL_AD_DECODE_ERROR;
2382                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2383                 goto f_err;
2384                 }
2385         n2l3(p, resplen);
2386         if (resplen + 4 != n)
2387                 {
2388                 al = SSL_AD_DECODE_ERROR;
2389                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2390                 goto f_err;
2391                 }
2392         if (s->tlsext_ocsp_resp)
2393                 OPENSSL_free(s->tlsext_ocsp_resp);
2394         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2395         if (!s->tlsext_ocsp_resp)
2396                 {
2397                 al = SSL_AD_INTERNAL_ERROR;
2398                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2399                 goto f_err;
2400                 }
2401         s->tlsext_ocsp_resplen = resplen;
2402         if (s->ctx->tlsext_status_cb)
2403                 {
2404                 int ret;
2405                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2406                 if (ret == 0)
2407                         {
2408                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2409                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2410                         goto f_err;
2411                         }
2412                 if (ret < 0)
2413                         {
2414                         al = SSL_AD_INTERNAL_ERROR;
2415                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2416                         goto f_err;
2417                         }
2418                 }
2419         return 1;
2420 f_err:
2421         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2422         return(-1);
2423         }
2424 #endif
2425
2426 int ssl3_get_server_done(SSL *s)
2427         {
2428         int ok,ret=0;
2429         long n;
2430
2431         n=s->method->ssl_get_message(s,
2432                 SSL3_ST_CR_SRVR_DONE_A,
2433                 SSL3_ST_CR_SRVR_DONE_B,
2434                 SSL3_MT_SERVER_DONE,
2435                 30, /* should be very small, like 0 :-) */
2436                 &ok);
2437
2438         if (!ok) return((int)n);
2439         if (n > 0)
2440                 {
2441                 /* should contain no data */
2442                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2443                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2444                 return -1;
2445                 }
2446         ret=1;
2447         return(ret);
2448         }
2449
2450
2451 int ssl3_send_client_key_exchange(SSL *s)
2452         {
2453         unsigned char *p;
2454         int n;
2455         unsigned long alg_k;
2456 #ifndef OPENSSL_NO_RSA
2457         unsigned char *q;
2458         EVP_PKEY *pkey=NULL;
2459 #endif
2460 #ifndef OPENSSL_NO_KRB5
2461         KSSL_ERR kssl_err;
2462 #endif /* OPENSSL_NO_KRB5 */
2463 #ifndef OPENSSL_NO_ECDH
2464         EC_KEY *clnt_ecdh = NULL;
2465         const EC_POINT *srvr_ecpoint = NULL;
2466         EVP_PKEY *srvr_pub_pkey = NULL;
2467         unsigned char *encodedPoint = NULL;
2468         int encoded_pt_len = 0;
2469         BN_CTX * bn_ctx = NULL;
2470 #endif
2471
2472         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2473                 {
2474                 p = ssl_handshake_start(s);
2475
2476                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2477
2478                 /* Fool emacs indentation */
2479                 if (0) {}
2480 #ifndef OPENSSL_NO_RSA
2481                 else if (alg_k & SSL_kRSA)
2482                         {
2483                         RSA *rsa;
2484                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2485
2486                         if (s->session->sess_cert == NULL)
2487                                 {
2488                                 /* We should always have a server certificate with SSL_kRSA. */
2489                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2490                                 goto err;
2491                                 }
2492
2493                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2494                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2495                         else
2496                                 {
2497                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2498                                 if ((pkey == NULL) ||
2499                                         (pkey->type != EVP_PKEY_RSA) ||
2500                                         (pkey->pkey.rsa == NULL))
2501                                         {
2502                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2503                                         goto err;
2504                                         }
2505                                 rsa=pkey->pkey.rsa;
2506                                 EVP_PKEY_free(pkey);
2507                                 }
2508                                 
2509                         tmp_buf[0]=s->client_version>>8;
2510                         tmp_buf[1]=s->client_version&0xff;
2511                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2512                                         goto err;
2513
2514                         s->session->master_key_length=sizeof tmp_buf;
2515
2516                         q=p;
2517                         /* Fix buf for TLS and beyond */
2518                         if (s->version > SSL3_VERSION)
2519                                 p+=2;
2520                         n=RSA_public_encrypt(sizeof tmp_buf,
2521                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2522 #ifdef PKCS1_CHECK
2523                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2524                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2525 #endif
2526                         if (n <= 0)
2527                                 {
2528                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2529                                 goto err;
2530                                 }
2531
2532                         /* Fix buf for TLS and beyond */
2533                         if (s->version > SSL3_VERSION)
2534                                 {
2535                                 s2n(n,q);
2536                                 n+=2;
2537                                 }
2538
2539                         s->session->master_key_length=
2540                                 s->method->ssl3_enc->generate_master_secret(s,
2541                                         s->session->master_key,
2542                                         tmp_buf,sizeof tmp_buf);
2543                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2544                         }
2545 #endif
2546 #ifndef OPENSSL_NO_KRB5
2547                 else if (alg_k & SSL_kKRB5)
2548                         {
2549                         krb5_error_code krb5rc;
2550                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2551                         /*  krb5_data   krb5_ap_req;  */
2552                         krb5_data       *enc_ticket;
2553                         krb5_data       authenticator, *authp = NULL;
2554                         EVP_CIPHER_CTX  ciph_ctx;
2555                         const EVP_CIPHER *enc = NULL;
2556                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2557                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2558                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
2559                                                 + EVP_MAX_IV_LENGTH];
2560                         int             padl, outl = sizeof(epms);
2561
2562                         EVP_CIPHER_CTX_init(&ciph_ctx);
2563
2564 #ifdef KSSL_DEBUG
2565                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2566                                 alg_k, SSL_kKRB5);
2567 #endif  /* KSSL_DEBUG */
2568
2569                         authp = NULL;
2570 #ifdef KRB5SENDAUTH
2571                         if (KRB5SENDAUTH)  authp = &authenticator;
2572 #endif  /* KRB5SENDAUTH */
2573
2574                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2575                                 &kssl_err);
2576                         enc = kssl_map_enc(kssl_ctx->enctype);
2577                         if (enc == NULL)
2578                             goto err;
2579 #ifdef KSSL_DEBUG
2580                         {
2581                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2582                         if (krb5rc && kssl_err.text)
2583                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2584                         }
2585 #endif  /* KSSL_DEBUG */
2586
2587                         if (krb5rc)
2588                                 {
2589                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2590                                                 SSL_AD_HANDSHAKE_FAILURE);
2591                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2592                                                 kssl_err.reason);
2593                                 goto err;
2594                                 }
2595
2596                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2597                         **  in place of RFC 2712 KerberosWrapper, as in:
2598                         **
2599                         **  Send ticket (copy to *p, set n = length)
2600                         **  n = krb5_ap_req.length;
2601                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2602                         **  if (krb5_ap_req.data)  
2603                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2604                         **
2605                         **  Now using real RFC 2712 KerberosWrapper
2606                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2607                         **  Note: 2712 "opaque" types are here replaced
2608                         **  with a 2-byte length followed by the value.
2609                         **  Example:
2610                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2611                         **  Where "xx xx" = length bytes.  Shown here with
2612                         **  optional authenticator omitted.
2613                         */
2614
2615                         /*  KerberosWrapper.Ticket              */
2616                         s2n(enc_ticket->length,p);
2617                         memcpy(p, enc_ticket->data, enc_ticket->length);
2618                         p+= enc_ticket->length;
2619                         n = enc_ticket->length + 2;
2620
2621                         /*  KerberosWrapper.Authenticator       */
2622                         if (authp  &&  authp->length)  
2623                                 {
2624                                 s2n(authp->length,p);
2625                                 memcpy(p, authp->data, authp->length);
2626                                 p+= authp->length;
2627                                 n+= authp->length + 2;
2628                                 
2629                                 free(authp->data);
2630                                 authp->data = NULL;
2631                                 authp->length = 0;
2632                                 }
2633                         else
2634                                 {
2635                                 s2n(0,p);/*  null authenticator length  */
2636                                 n+=2;
2637                                 }
2638  
2639                             tmp_buf[0]=s->client_version>>8;
2640                             tmp_buf[1]=s->client_version&0xff;
2641                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2642                                 goto err;
2643
2644                         /*  20010420 VRS.  Tried it this way; failed.
2645                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2646                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2647                         **                              kssl_ctx->length);
2648                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2649                         */
2650
2651                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2652                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2653                                 kssl_ctx->key,iv);
2654                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2655                                 sizeof tmp_buf);
2656                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2657                         outl += padl;
2658                         if (outl > (int)sizeof epms)
2659                                 {
2660                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2661                                 goto err;
2662                                 }
2663                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2664
2665                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2666                         s2n(outl,p);
2667                         memcpy(p, epms, outl);
2668                         p+=outl;
2669                         n+=outl + 2;
2670
2671                         s->session->master_key_length=
2672                                 s->method->ssl3_enc->generate_master_secret(s,
2673                                         s->session->master_key,
2674                                         tmp_buf, sizeof tmp_buf);
2675
2676                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2677                         OPENSSL_cleanse(epms, outl);
2678                         }
2679 #endif
2680 #ifndef OPENSSL_NO_DH
2681                 else if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
2682                         {
2683                         DH *dh_srvr,*dh_clnt;
2684                         SESS_CERT *scert = s->session->sess_cert;
2685
2686                         if (scert == NULL) 
2687                                 {
2688                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2689                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2690                                 goto err;
2691                                 }
2692
2693                         if (scert->peer_dh_tmp != NULL)
2694                                 dh_srvr=scert->peer_dh_tmp;
2695                         else
2696                                 {
2697                                 /* we get them from the cert */
2698                                 int idx = scert->peer_cert_type;
2699                                 EVP_PKEY *spkey = NULL;
2700                                 dh_srvr = NULL;
2701                                 if (idx >= 0)
2702                                         spkey = X509_get_pubkey(
2703                                                 scert->peer_pkeys[idx].x509);
2704                                 if (spkey)
2705                                         {
2706                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2707                                         EVP_PKEY_free(spkey);
2708                                         }
2709                                 if (dh_srvr == NULL)
2710                                         {
2711                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2712                                             ERR_R_INTERNAL_ERROR);
2713                                         goto err;
2714                                         }
2715                                 }
2716                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2717                                 {
2718                                 /* Use client certificate key */
2719                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2720                                 dh_clnt = NULL;
2721                                 if (clkey)
2722                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2723                                 if (dh_clnt == NULL)
2724                                         {
2725                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2726                                             ERR_R_INTERNAL_ERROR);
2727                                         goto err;
2728                                         }
2729                                 }
2730                         else
2731                                 {
2732                                 /* generate a new random key */
2733                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2734                                         {
2735                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2736                                         goto err;
2737                                         }
2738                                 if (!DH_generate_key(dh_clnt))
2739                                         {
2740                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2741                                         DH_free(dh_clnt);
2742                                         goto err;
2743                                         }
2744                                 }
2745
2746                         /* use the 'p' output buffer for the DH key, but
2747                          * make sure to clear it out afterwards */
2748
2749                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2750                         if (scert->peer_dh_tmp == NULL)
2751                                 DH_free(dh_srvr);
2752
2753                         if (n <= 0)
2754                                 {
2755                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2756                                 DH_free(dh_clnt);
2757                                 goto err;
2758                                 }
2759
2760                         /* generate master key from the result */
2761                         s->session->master_key_length=
2762                                 s->method->ssl3_enc->generate_master_secret(s,
2763                                         s->session->master_key,p,n);
2764                         /* clean up */
2765                         memset(p,0,n);
2766
2767                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2768                                 n = 0;
2769                         else
2770                                 {
2771                                 /* send off the data */
2772                                 n=BN_num_bytes(dh_clnt->pub_key);
2773                                 s2n(n,p);
2774                                 BN_bn2bin(dh_clnt->pub_key,p);
2775                                 n+=2;
2776                                 }
2777
2778                         DH_free(dh_clnt);
2779
2780                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2781                         }
2782 #endif
2783
2784 #ifndef OPENSSL_NO_ECDH 
2785                 else if (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe))
2786                         {
2787                         const EC_GROUP *srvr_group = NULL;
2788                         EC_KEY *tkey;
2789                         int ecdh_clnt_cert = 0;
2790                         int field_size = 0;
2791
2792                         if (s->session->sess_cert == NULL) 
2793                                 {
2794                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2795                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2796                                 goto err;
2797                                 }
2798
2799                         /* Did we send out the client's
2800                          * ECDH share for use in premaster
2801                          * computation as part of client certificate?
2802                          * If so, set ecdh_clnt_cert to 1.
2803                          */
2804                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
2805                                 {
2806                                 /* XXX: For now, we do not support client
2807                                  * authentication using ECDH certificates.
2808                                  * To add such support, one needs to add
2809                                  * code that checks for appropriate 
2810                                  * conditions and sets ecdh_clnt_cert to 1.
2811                                  * For example, the cert have an ECC
2812                                  * key on the same curve as the server's
2813                                  * and the key should be authorized for
2814                                  * key agreement.
2815                                  *
2816                                  * One also needs to add code in ssl3_connect
2817                                  * to skip sending the certificate verify
2818                                  * message.
2819                                  *
2820                                  * if ((s->cert->key->privatekey != NULL) &&
2821                                  *     (s->cert->key->privatekey->type ==
2822                                  *      EVP_PKEY_EC) && ...)
2823                                  * ecdh_clnt_cert = 1;
2824                                  */
2825                                 }
2826
2827                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2828                                 {
2829                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2830                                 }
2831                         else
2832                                 {
2833                                 /* Get the Server Public Key from Cert */
2834                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2835                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2836                                 if ((srvr_pub_pkey == NULL) ||
2837                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2838                                     (srvr_pub_pkey->pkey.ec == NULL))
2839                                         {
2840                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2841                                             ERR_R_INTERNAL_ERROR);
2842                                         goto err;
2843                                         }
2844
2845                                 tkey = srvr_pub_pkey->pkey.ec;
2846                                 }
2847
2848                         srvr_group   = EC_KEY_get0_group(tkey);
2849                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2850
2851                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2852                                 {
2853                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2854                                     ERR_R_INTERNAL_ERROR);
2855                                 goto err;
2856                                 }
2857
2858                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
2859                                 {
2860                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2861                                 goto err;
2862                                 }
2863
2864                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2865                                 {
2866                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2867                                 goto err;
2868                                 }
2869                         if (ecdh_clnt_cert) 
2870                                 { 
2871                                 /* Reuse key info from our certificate
2872                                  * We only need our private key to perform
2873                                  * the ECDH computation.
2874                                  */
2875                                 const BIGNUM *priv_key;
2876                                 tkey = s->cert->key->privatekey->pkey.ec;
2877                                 priv_key = EC_KEY_get0_private_key(tkey);
2878                                 if (priv_key == NULL)
2879                                         {
2880                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2881                                         goto err;
2882                                         }
2883                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2884                                         {
2885                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2886                                         goto err;
2887                                         }
2888                                 }
2889                         else 
2890                                 {
2891                                 /* Generate a new ECDH key pair */
2892                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2893                                         {
2894                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2895                                         goto err;
2896                                         }
2897                                 }
2898
2899                         /* use the 'p' output buffer for the ECDH key, but
2900                          * make sure to clear it out afterwards
2901                          */
2902
2903                         field_size = EC_GROUP_get_degree(srvr_group);
2904                         if (field_size <= 0)
2905                                 {
2906                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2907                                        ERR_R_ECDH_LIB);
2908                                 goto err;
2909                                 }
2910                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2911                         if (n <= 0)
2912                                 {
2913                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2914                                        ERR_R_ECDH_LIB);
2915                                 goto err;
2916                                 }
2917
2918                         /* generate master key from the result */
2919                         s->session->master_key_length = s->method->ssl3_enc \
2920                             -> generate_master_secret(s, 
2921                                 s->session->master_key,
2922                                 p, n);
2923
2924                         memset(p, 0, n); /* clean up */
2925
2926                         if (ecdh_clnt_cert) 
2927                                 {
2928                                 /* Send empty client key exch message */
2929                                 n = 0;
2930                                 }
2931                         else 
2932                                 {
2933                                 /* First check the size of encoding and
2934                                  * allocate memory accordingly.
2935                                  */
2936                                 encoded_pt_len = 
2937                                     EC_POINT_point2oct(srvr_group, 
2938                                         EC_KEY_get0_public_key(clnt_ecdh), 
2939                                         POINT_CONVERSION_UNCOMPRESSED, 
2940                                         NULL, 0, NULL);
2941
2942                                 encodedPoint = (unsigned char *) 
2943                                     OPENSSL_malloc(encoded_pt_len * 
2944                                         sizeof(unsigned char)); 
2945                                 bn_ctx = BN_CTX_new();
2946                                 if ((encodedPoint == NULL) || 
2947                                     (bn_ctx == NULL)) 
2948                                         {
2949                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2950                                         goto err;
2951                                         }
2952
2953                                 /* Encode the public key */
2954                                 n = EC_POINT_point2oct(srvr_group, 
2955                                     EC_KEY_get0_public_key(clnt_ecdh), 
2956                                     POINT_CONVERSION_UNCOMPRESSED, 
2957                                     encodedPoint, encoded_pt_len, bn_ctx);
2958
2959                                 *p = n; /* length of encoded point */
2960                                 /* Encoded point will be copied here */
2961                                 p += 1; 
2962                                 /* copy the point */
2963                                 memcpy((unsigned char *)p, encodedPoint, n);
2964                                 /* increment n to account for length field */
2965                                 n += 1; 
2966                                 }
2967
2968                         /* Free allocated memory */
2969                         BN_CTX_free(bn_ctx);
2970                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2971                         if (clnt_ecdh != NULL) 
2972                                  EC_KEY_free(clnt_ecdh);
2973                         EVP_PKEY_free(srvr_pub_pkey);
2974                         }
2975 #endif /* !OPENSSL_NO_ECDH */
2976                 else if (alg_k & SSL_kGOST) 
2977                         {
2978                         /* GOST key exchange message creation */
2979                         EVP_PKEY_CTX *pkey_ctx;
2980                         X509 *peer_cert; 
2981                         size_t msglen;
2982                         unsigned int md_len;
2983                         int keytype;
2984                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2985                         EVP_MD_CTX *ukm_hash;
2986                         EVP_PKEY *pub_key;
2987
2988                         /* Get server sertificate PKEY and create ctx from it */
2989                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2990                         if (!peer_cert) 
2991                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2992                         if (!peer_cert)         {
2993                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2994                                         goto err;
2995                                 }       
2996                                 
2997                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2998                         /* If we have send a certificate, and certificate key
2999
3000                          * parameters match those of server certificate, use
3001                          * certificate key for key exchange
3002                          */
3003
3004                          /* Otherwise, generate ephemeral key pair */
3005                                         
3006                         EVP_PKEY_encrypt_init(pkey_ctx);
3007                           /* Generate session key */    
3008                     RAND_bytes(premaster_secret,32);
3009                         /* If we have client certificate, use its secret as peer key */
3010                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
3011                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
3012                                         /* If there was an error - just ignore it. Ephemeral key
3013                                         * would be used
3014                                         */
3015                                         ERR_clear_error();
3016                                 }
3017                         }                       
3018                         /* Compute shared IV and store it in algorithm-specific
3019                          * context data */
3020                         ukm_hash = EVP_MD_CTX_create();
3021                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
3022                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
3023                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
3024                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
3025                         EVP_MD_CTX_destroy(ukm_hash);
3026                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
3027                                 8,shared_ukm)<0) {
3028                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3029                                                 SSL_R_LIBRARY_BUG);
3030                                         goto err;
3031                                 }       
3032                         /* Make GOST keytransport blob message */
3033                         /*Encapsulate it into sequence */
3034                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
3035                         msglen=255;
3036                      &nbs