Clarify CMS_decrypt behaviour.
[openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #include <stdio.h>
152 #include "ssl_locl.h"
153 #include "kssl_lcl.h"
154 #include <openssl/buffer.h>
155 #include <openssl/rand.h>
156 #include <openssl/objects.h>
157 #include <openssl/evp.h>
158 #include <openssl/md5.h>
159 #ifdef OPENSSL_FIPS
160 #include <openssl/fips.h>
161 #endif
162 #ifndef OPENSSL_NO_DH
163 #include <openssl/dh.h>
164 #endif
165 #include <openssl/bn.h>
166 #ifndef OPENSSL_NO_ENGINE
167 #include <openssl/engine.h>
168 #endif
169
170 static const SSL_METHOD *ssl3_get_client_method(int ver);
171 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
172
173 static const SSL_METHOD *ssl3_get_client_method(int ver)
174         {
175         if (ver == SSL3_VERSION)
176                 return(SSLv3_client_method());
177         else
178                 return(NULL);
179         }
180
181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
182                         ssl_undefined_function,
183                         ssl3_connect,
184                         ssl3_get_client_method)
185
186 int ssl3_connect(SSL *s)
187         {
188         BUF_MEM *buf=NULL;
189         unsigned long Time=(unsigned long)time(NULL);
190         void (*cb)(const SSL *ssl,int type,int val)=NULL;
191         int ret= -1;
192         int new_state,state,skip=0;
193
194         RAND_add(&Time,sizeof(Time),0);
195         ERR_clear_error();
196         clear_sys_error();
197
198         if (s->info_callback != NULL)
199                 cb=s->info_callback;
200         else if (s->ctx->info_callback != NULL)
201                 cb=s->ctx->info_callback;
202         
203         s->in_handshake++;
204         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
205
206 #ifndef OPENSSL_NO_HEARTBEATS
207         /* If we're awaiting a HeartbeatResponse, pretend we
208          * already got and don't await it anymore, because
209          * Heartbeats don't make sense during handshakes anyway.
210          */
211         if (s->tlsext_hb_pending)
212                 {
213                 s->tlsext_hb_pending = 0;
214                 s->tlsext_hb_seq++;
215                 }
216 #endif
217
218         for (;;)
219                 {
220                 state=s->state;
221
222                 switch(s->state)
223                         {
224                 case SSL_ST_RENEGOTIATE:
225                         s->renegotiate=1;
226                         s->state=SSL_ST_CONNECT;
227                         s->ctx->stats.sess_connect_renegotiate++;
228                         /* break */
229                 case SSL_ST_BEFORE:
230                 case SSL_ST_CONNECT:
231                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
232                 case SSL_ST_OK|SSL_ST_CONNECT:
233
234                         s->server=0;
235                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
236
237                         if ((s->version & 0xff00 ) != 0x0300)
238                                 {
239                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
240                                 ret = -1;
241                                 goto end;
242                                 }
243
244                         if (!ssl_security(s, SSL_SECOP_VERSION, 0,
245                                                         s->version, NULL))
246                                 {
247                                 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
248                                 return -1;
249                                 }
250                                 
251                         /* s->version=SSL3_VERSION; */
252                         s->type=SSL_ST_CONNECT;
253
254                         if (s->init_buf == NULL)
255                                 {
256                                 if ((buf=BUF_MEM_new()) == NULL)
257                                         {
258                                         ret= -1;
259                                         goto end;
260                                         }
261                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
262                                         {
263                                         ret= -1;
264                                         goto end;
265                                         }
266                                 s->init_buf=buf;
267                                 buf=NULL;
268                                 }
269
270                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
271
272                         /* setup buffing BIO */
273                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
274
275                         /* don't push the buffering BIO quite yet */
276
277                         ssl3_init_finished_mac(s);
278
279                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
280                         s->ctx->stats.sess_connect++;
281                         s->init_num=0;
282                         break;
283
284                 case SSL3_ST_CW_CLNT_HELLO_A:
285                 case SSL3_ST_CW_CLNT_HELLO_B:
286
287                         s->shutdown=0;
288                         ret=ssl3_client_hello(s);
289                         if (ret <= 0) goto end;
290                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
291                         s->init_num=0;
292
293                         /* turn on buffering for the next lot of output */
294                         if (s->bbio != s->wbio)
295                                 s->wbio=BIO_push(s->bbio,s->wbio);
296
297                         break;
298
299                 case SSL3_ST_CR_SRVR_HELLO_A:
300                 case SSL3_ST_CR_SRVR_HELLO_B:
301                         ret=ssl3_get_server_hello(s);
302                         if (ret <= 0) goto end;
303
304                         if (s->hit)
305                                 {
306                                 s->state=SSL3_ST_CR_FINISHED_A;
307 #ifndef OPENSSL_NO_TLSEXT
308                                 if (s->tlsext_ticket_expected)
309                                         {
310                                         /* receive renewed session ticket */
311                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
312                                         }
313 #endif
314                                 }
315                         else
316                                 {
317                                         s->state=SSL3_ST_CR_CERT_A;
318                                 }
319                         s->init_num=0;
320                         break;
321 #ifndef OPENSSL_NO_TLSEXT
322                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_A:
323                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_B:
324                         ret = tls1_get_server_supplemental_data(s);
325                         if (ret <= 0) goto end;
326                         s->state=SSL3_ST_CR_CERT_A;
327                         s->init_num = 0;
328                         break;
329 #endif
330                 case SSL3_ST_CR_CERT_A:
331                 case SSL3_ST_CR_CERT_B:
332 #ifndef OPENSSL_NO_TLSEXT
333                         ret=ssl3_check_finished(s);
334                         if (ret <= 0) goto end;
335                         if (ret == 3)
336                                 {
337                                 s->state=SSL3_ST_CR_SUPPLEMENTAL_DATA_A;
338                                 s->init_num=0;
339                                 break;
340                                 }
341                         if (ret == 2)
342                                 {
343                                 s->hit = 1;
344                                 if (s->tlsext_ticket_expected)
345                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
346                                 else
347                                         s->state=SSL3_ST_CR_FINISHED_A;
348                                 s->init_num=0;
349                                 break;
350                                 }
351 #endif
352                         /* Check if it is anon DH/ECDH */
353                         /* or PSK */
354                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
355                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
356                                 {
357                                 ret=ssl3_get_server_certificate(s);
358                                 if (ret <= 0) goto end;
359 #ifndef OPENSSL_NO_TLSEXT
360                                 if (s->tlsext_status_expected)
361                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
362                                 else
363                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
364                                 }
365                         else
366                                 {
367                                 skip = 1;
368                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
369                                 }
370 #else
371                                 }
372                         else
373                                 skip=1;
374
375                         s->state=SSL3_ST_CR_KEY_EXCH_A;
376 #endif
377                         s->init_num=0;
378                         break;
379
380                 case SSL3_ST_CR_KEY_EXCH_A:
381                 case SSL3_ST_CR_KEY_EXCH_B:
382                         ret=ssl3_get_key_exchange(s);
383                         if (ret <= 0) goto end;
384                         s->state=SSL3_ST_CR_CERT_REQ_A;
385                         s->init_num=0;
386
387                         /* at this point we check that we have the
388                          * required stuff from the server */
389                         if (!ssl3_check_cert_and_algorithm(s))
390                                 {
391                                 ret= -1;
392                                 goto end;
393                                 }
394                         break;
395
396                 case SSL3_ST_CR_CERT_REQ_A:
397                 case SSL3_ST_CR_CERT_REQ_B:
398                         ret=ssl3_get_certificate_request(s);
399                         if (ret <= 0) goto end;
400                         s->state=SSL3_ST_CR_SRVR_DONE_A;
401                         s->init_num=0;
402                         break;
403
404                 case SSL3_ST_CR_SRVR_DONE_A:
405                 case SSL3_ST_CR_SRVR_DONE_B:
406                         ret=ssl3_get_server_done(s);
407                         if (ret <= 0) goto end;
408 #ifndef OPENSSL_NO_SRP
409                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
410                                 {
411                                 if ((ret = SRP_Calc_A_param(s))<=0)
412                                         {
413                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
414                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
415                                         goto end;
416                                         }
417                                 }
418 #endif
419 #ifndef OPENSSL_NO_TLSEXT
420                         s->state=SSL3_ST_CW_SUPPLEMENTAL_DATA_A;
421 #else
422                         if (s->s3->tmp.cert_req)
423                                 s->state=SSL3_ST_CW_CERT_A;
424                         else
425                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
426 #endif
427                         s->init_num=0;
428
429                         break;
430
431                 case SSL3_ST_CW_CERT_A:
432                 case SSL3_ST_CW_CERT_B:
433                 case SSL3_ST_CW_CERT_C:
434                 case SSL3_ST_CW_CERT_D:
435                         ret=ssl3_send_client_certificate(s);
436                         if (ret <= 0) goto end;
437                         s->state=SSL3_ST_CW_KEY_EXCH_A;
438                         s->init_num=0;
439                         break;
440
441                 case SSL3_ST_CW_KEY_EXCH_A:
442                 case SSL3_ST_CW_KEY_EXCH_B:
443                         ret=ssl3_send_client_key_exchange(s);
444                         if (ret <= 0) goto end;
445                         /* EAY EAY EAY need to check for DH fix cert
446                          * sent back */
447                         /* For TLS, cert_req is set to 2, so a cert chain
448                          * of nothing is sent, but no verify packet is sent */
449                         /* XXX: For now, we do not support client 
450                          * authentication in ECDH cipher suites with
451                          * ECDH (rather than ECDSA) certificates.
452                          * We need to skip the certificate verify 
453                          * message when client's ECDH public key is sent 
454                          * inside the client certificate.
455                          */
456                         if (s->s3->tmp.cert_req == 1)
457                                 {
458                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
459                                 }
460                         else
461                                 {
462                                 s->state=SSL3_ST_CW_CHANGE_A;
463                                 s->s3->change_cipher_spec=0;
464                                 }
465                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
466                                 {
467                                 s->state=SSL3_ST_CW_CHANGE_A;
468                                 s->s3->change_cipher_spec=0;
469                                 }
470
471                         s->init_num=0;
472                         break;
473
474                 case SSL3_ST_CW_CERT_VRFY_A:
475                 case SSL3_ST_CW_CERT_VRFY_B:
476                         ret=ssl3_send_client_verify(s);
477                         if (ret <= 0) goto end;
478                         s->state=SSL3_ST_CW_CHANGE_A;
479                         s->init_num=0;
480                         s->s3->change_cipher_spec=0;
481                         break;
482
483                 case SSL3_ST_CW_CHANGE_A:
484                 case SSL3_ST_CW_CHANGE_B:
485                         ret=ssl3_send_change_cipher_spec(s,
486                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
487                         if (ret <= 0) goto end;
488
489 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
490                         s->state=SSL3_ST_CW_FINISHED_A;
491 #else
492                         if (s->s3->next_proto_neg_seen)
493                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
494                         else
495                                 s->state=SSL3_ST_CW_FINISHED_A;
496 #endif
497                         s->init_num=0;
498
499                         s->session->cipher=s->s3->tmp.new_cipher;
500 #ifdef OPENSSL_NO_COMP
501                         s->session->compress_meth=0;
502 #else
503                         if (s->s3->tmp.new_compression == NULL)
504                                 s->session->compress_meth=0;
505                         else
506                                 s->session->compress_meth=
507                                         s->s3->tmp.new_compression->id;
508 #endif
509                         if (!s->method->ssl3_enc->setup_key_block(s))
510                                 {
511                                 ret= -1;
512                                 goto end;
513                                 }
514
515                         if (!s->method->ssl3_enc->change_cipher_state(s,
516                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
517                                 {
518                                 ret= -1;
519                                 goto end;
520                                 }
521
522                         break;
523
524 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
525                 case SSL3_ST_CW_NEXT_PROTO_A:
526                 case SSL3_ST_CW_NEXT_PROTO_B:
527                         ret=ssl3_send_next_proto(s);
528                         if (ret <= 0) goto end;
529                         s->state=SSL3_ST_CW_FINISHED_A;
530                         break;
531 #endif
532
533 #ifndef OPENSSL_NO_TLSEXT
534                 case SSL3_ST_CW_SUPPLEMENTAL_DATA_A:
535                 case SSL3_ST_CW_SUPPLEMENTAL_DATA_B:
536                         ret = tls1_send_client_supplemental_data(s, &skip);
537                         if (ret <= 0) goto end;
538                         if (s->s3->tmp.cert_req)
539                                 s->state=SSL3_ST_CW_CERT_A;
540                         else
541                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
542                         s->init_num=0;
543                         break;
544 #endif
545
546                 case SSL3_ST_CW_FINISHED_A:
547                 case SSL3_ST_CW_FINISHED_B:
548                         ret=ssl3_send_finished(s,
549                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
550                                 s->method->ssl3_enc->client_finished_label,
551                                 s->method->ssl3_enc->client_finished_label_len);
552                         if (ret <= 0) goto end;
553                         s->state=SSL3_ST_CW_FLUSH;
554
555                         /* clear flags */
556                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
557                         if (s->hit)
558                                 {
559                                 s->s3->tmp.next_state=SSL_ST_OK;
560                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
561                                         {
562                                         s->state=SSL_ST_OK;
563                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
564                                         s->s3->delay_buf_pop_ret=0;
565                                         }
566                                 }
567                         else
568                                 {
569 #ifndef OPENSSL_NO_TLSEXT
570                                 /* Allow NewSessionTicket if ticket expected */
571                                 if (s->tlsext_ticket_expected)
572                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
573                                 else
574 #endif
575                                 
576                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
577                                 }
578                         s->init_num=0;
579                         break;
580
581 #ifndef OPENSSL_NO_TLSEXT
582                 case SSL3_ST_CR_SESSION_TICKET_A:
583                 case SSL3_ST_CR_SESSION_TICKET_B:
584                         ret=ssl3_get_new_session_ticket(s);
585                         if (ret <= 0) goto end;
586                         s->state=SSL3_ST_CR_FINISHED_A;
587                         s->init_num=0;
588                 break;
589
590                 case SSL3_ST_CR_CERT_STATUS_A:
591                 case SSL3_ST_CR_CERT_STATUS_B:
592                         ret=ssl3_get_cert_status(s);
593                         if (ret <= 0) goto end;
594                         s->state=SSL3_ST_CR_KEY_EXCH_A;
595                         s->init_num=0;
596                 break;
597 #endif
598
599                 case SSL3_ST_CR_FINISHED_A:
600                 case SSL3_ST_CR_FINISHED_B:
601
602                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
603                                 SSL3_ST_CR_FINISHED_B);
604                         if (ret <= 0) goto end;
605
606                         if (s->hit)
607                                 s->state=SSL3_ST_CW_CHANGE_A;
608                         else
609                                 s->state=SSL_ST_OK;
610                         s->init_num=0;
611                         break;
612
613                 case SSL3_ST_CW_FLUSH:
614                         s->rwstate=SSL_WRITING;
615                         if (BIO_flush(s->wbio) <= 0)
616                                 {
617                                 ret= -1;
618                                 goto end;
619                                 }
620                         s->rwstate=SSL_NOTHING;
621                         s->state=s->s3->tmp.next_state;
622                         break;
623
624                 case SSL_ST_OK:
625                         /* clean a few things up */
626                         ssl3_cleanup_key_block(s);
627
628                         if (s->init_buf != NULL)
629                                 {
630                                 BUF_MEM_free(s->init_buf);
631                                 s->init_buf=NULL;
632                                 }
633
634                         /* If we are not 'joining' the last two packets,
635                          * remove the buffering now */
636                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
637                                 ssl_free_wbio_buffer(s);
638                         /* else do it later in ssl3_write */
639
640                         s->init_num=0;
641                         s->renegotiate=0;
642                         s->new_session=0;
643
644                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
645                         if (s->hit) s->ctx->stats.sess_hit++;
646
647                         ret=1;
648                         /* s->server=0; */
649                         s->handshake_func=ssl3_connect;
650                         s->ctx->stats.sess_connect_good++;
651
652                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
653
654                         goto end;
655                         /* break; */
656                         
657                 default:
658                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
659                         ret= -1;
660                         goto end;
661                         /* break; */
662                         }
663
664                 /* did we do anything */
665                 if (!s->s3->tmp.reuse_message && !skip)
666                         {
667                         if (s->debug)
668                                 {
669                                 if ((ret=BIO_flush(s->wbio)) <= 0)
670                                         goto end;
671                                 }
672
673                         if ((cb != NULL) && (s->state != state))
674                                 {
675                                 new_state=s->state;
676                                 s->state=state;
677                                 cb(s,SSL_CB_CONNECT_LOOP,1);
678                                 s->state=new_state;
679                                 }
680                         }
681                 skip=0;
682                 }
683 end:
684         s->in_handshake--;
685         if (buf != NULL)
686                 BUF_MEM_free(buf);
687         if (cb != NULL)
688                 cb(s,SSL_CB_CONNECT_EXIT,ret);
689         return(ret);
690         }
691
692
693 int ssl3_client_hello(SSL *s)
694         {
695         unsigned char *buf;
696         unsigned char *p,*d;
697         int i;
698         unsigned long l;
699         int al = 0;
700 #ifndef OPENSSL_NO_COMP
701         int j;
702         SSL_COMP *comp;
703 #endif
704
705         buf=(unsigned char *)s->init_buf->data;
706         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
707                 {
708                 SSL_SESSION *sess = s->session;
709                 if ((sess == NULL) ||
710                         (sess->ssl_version != s->version) ||
711 #ifdef OPENSSL_NO_TLSEXT
712                         !sess->session_id_length ||
713 #else
714                         (!sess->session_id_length && !sess->tlsext_tick) ||
715 #endif
716                         (sess->not_resumable))
717                         {
718                         if (!ssl_get_new_session(s,0))
719                                 goto err;
720                         }
721                 if (s->method->version == DTLS_ANY_VERSION)
722                         {
723                         /* Determine which DTLS version to use */
724                         int options = s->options;
725                         /* If DTLS 1.2 disabled correct the version number */
726                         if (options & SSL_OP_NO_DTLSv1_2)
727                                 {
728                                 if (tls1_suiteb(s))
729                                         {
730                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
731                                         goto err;
732                                         }
733                                 /* Disabling all versions is silly: return an
734                                  * error.
735                                  */
736                                 if (options & SSL_OP_NO_DTLSv1)
737                                         {
738                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
739                                         goto err;
740                                         }
741                                 /* Update method so we don't use any DTLS 1.2
742                                  * features.
743                                  */
744                                 s->method = DTLSv1_client_method();
745                                 s->version = DTLS1_VERSION;
746                                 }
747                         else
748                                 {
749                                 /* We only support one version: update method */
750                                 if (options & SSL_OP_NO_DTLSv1)
751                                         s->method = DTLSv1_2_client_method();
752                                 s->version = DTLS1_2_VERSION;
753                                 }
754                         s->client_version = s->version;
755                         }
756                 /* else use the pre-loaded session */
757
758                 p=s->s3->client_random;
759
760                 /* for DTLS if client_random is initialized, reuse it, we are
761                  * required to use same upon reply to HelloVerify */
762                 if (SSL_IS_DTLS(s))
763                         {
764                         size_t idx;
765                         i = 1;
766                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
767                                 {
768                                 if (p[idx])
769                                         {
770                                         i = 0;
771                                         break;
772                                         }
773                                 }
774                         }
775                 else 
776                         i = 1;
777
778                 if (i)
779                         ssl_fill_hello_random(s, 0, p,
780                                               sizeof(s->s3->client_random));
781
782                 /* Do the message type and length last */
783                 d=p= ssl_handshake_start(s);
784
785                 /* version indicates the negotiated version: for example from
786                  * an SSLv2/v3 compatible client hello). The client_version
787                  * field is the maximum version we permit and it is also
788                  * used in RSA encrypted premaster secrets. Some servers can
789                  * choke if we initially report a higher version then
790                  * renegotiate to a lower one in the premaster secret. This
791                  * didn't happen with TLS 1.0 as most servers supported it
792                  * but it can with TLS 1.1 or later if the server only supports
793                  * 1.0.
794                  *
795                  * Possible scenario with previous logic:
796                  *      1. Client hello indicates TLS 1.2
797                  *      2. Server hello says TLS 1.0
798                  *      3. RSA encrypted premaster secret uses 1.2.
799                  *      4. Handhaked proceeds using TLS 1.0.
800                  *      5. Server sends hello request to renegotiate.
801                  *      6. Client hello indicates TLS v1.0 as we now
802                  *         know that is maximum server supports.
803                  *      7. Server chokes on RSA encrypted premaster secret
804                  *         containing version 1.0.
805                  *
806                  * For interoperability it should be OK to always use the
807                  * maximum version we support in client hello and then rely
808                  * on the checking of version to ensure the servers isn't
809                  * being inconsistent: for example initially negotiating with
810                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
811                  * client_version in client hello and not resetting it to
812                  * the negotiated version.
813                  */
814 #if 0
815                 *(p++)=s->version>>8;
816                 *(p++)=s->version&0xff;
817                 s->client_version=s->version;
818 #else
819                 *(p++)=s->client_version>>8;
820                 *(p++)=s->client_version&0xff;
821 #endif
822
823                 /* Random stuff */
824                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
825                 p+=SSL3_RANDOM_SIZE;
826
827                 /* Session ID */
828                 if (s->new_session)
829                         i=0;
830                 else
831                         i=s->session->session_id_length;
832                 *(p++)=i;
833                 if (i != 0)
834                         {
835                         if (i > (int)sizeof(s->session->session_id))
836                                 {
837                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
838                                 goto err;
839                                 }
840                         memcpy(p,s->session->session_id,i);
841                         p+=i;
842                         }
843                 
844                 /* cookie stuff for DTLS */
845                 if (SSL_IS_DTLS(s))
846                         {
847                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
848                                 {
849                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
850                                 goto err;
851                                 }
852                         *(p++) = s->d1->cookie_len;
853                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
854                         p += s->d1->cookie_len;
855                         }
856                 
857                 /* Ciphers supported */
858                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
859                 if (i == 0)
860                         {
861                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
862                         goto err;
863                         }
864 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
865                         /* Some servers hang if client hello > 256 bytes
866                          * as hack workaround chop number of supported ciphers
867                          * to keep it well below this if we use TLS v1.2
868                          */
869                         if (TLS1_get_version(s) >= TLS1_2_VERSION
870                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
871                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
872 #endif
873                 s2n(i,p);
874                 p+=i;
875
876                 /* COMPRESSION */
877 #ifdef OPENSSL_NO_COMP
878                 *(p++)=1;
879 #else
880
881                 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
882                         j=0;
883                 else
884                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
885                 *(p++)=1+j;
886                 for (i=0; i<j; i++)
887                         {
888                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
889                         *(p++)=comp->id;
890                         }
891 #endif
892                 *(p++)=0; /* Add the NULL method */
893
894 #ifndef OPENSSL_NO_TLSEXT
895                 /* TLS extensions*/
896                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
897                         {
898                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
899                         goto err;
900                         }
901                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
902                         {
903                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
904                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
905                         goto err;
906                         }
907 #endif
908                 
909                 l= p-d;
910                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
911                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
912                 }
913
914         /* SSL3_ST_CW_CLNT_HELLO_B */
915         return ssl_do_write(s);
916 err:
917         return(-1);
918         }
919
920 int ssl3_get_server_hello(SSL *s)
921         {
922         STACK_OF(SSL_CIPHER) *sk;
923         const SSL_CIPHER *c;
924         CERT *ct = s->cert;
925         unsigned char *p,*d;
926         int i,al=SSL_AD_INTERNAL_ERROR,ok;
927         unsigned int j;
928         long n;
929 #ifndef OPENSSL_NO_COMP
930         SSL_COMP *comp;
931 #endif
932         /* Hello verify request and/or server hello version may not
933          * match so set first packet if we're negotiating version.
934          */
935         if (SSL_IS_DTLS(s))
936                 s->first_packet = 1;
937
938         n=s->method->ssl_get_message(s,
939                 SSL3_ST_CR_SRVR_HELLO_A,
940                 SSL3_ST_CR_SRVR_HELLO_B,
941                 -1,
942                 20000, /* ?? */
943                 &ok);
944
945         if (!ok) return((int)n);
946
947         if (SSL_IS_DTLS(s))
948                 {
949                 s->first_packet = 0;
950                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
951                         {
952                         if ( s->d1->send_cookie == 0)
953                                 {
954                                 s->s3->tmp.reuse_message = 1;
955                                 return 1;
956                                 }
957                         else /* already sent a cookie */
958                                 {
959                                 al=SSL_AD_UNEXPECTED_MESSAGE;
960                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
961                                 goto f_err;
962                                 }
963                         }
964                 }
965         
966         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
967                 {
968                 al=SSL_AD_UNEXPECTED_MESSAGE;
969                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
970                 goto f_err;
971                 }
972
973         d=p=(unsigned char *)s->init_msg;
974         if (s->method->version == DTLS_ANY_VERSION)
975                 {
976                 /* Work out correct protocol version to use */
977                 int hversion = (p[0] << 8)|p[1];
978                 int options = s->options;
979                 if (hversion == DTLS1_2_VERSION
980                         && !(options & SSL_OP_NO_DTLSv1_2))
981                         s->method = DTLSv1_2_client_method();
982                 else if (tls1_suiteb(s))
983                         {
984                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
985                         s->version = hversion;
986                         al = SSL_AD_PROTOCOL_VERSION;
987                         goto f_err;
988                         }
989                 else if (hversion == DTLS1_VERSION
990                         && !(options & SSL_OP_NO_DTLSv1))
991                         s->method = DTLSv1_client_method();
992                 else
993                         {
994                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
995                         s->version = hversion;
996                         al = SSL_AD_PROTOCOL_VERSION;
997                         goto f_err;
998                         }
999                 s->version = s->client_version = s->method->version;
1000                 }
1001
1002         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
1003                 {
1004                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
1005                 s->version=(s->version&0xff00)|p[1];
1006                 al=SSL_AD_PROTOCOL_VERSION;
1007                 goto f_err;
1008                 }
1009         p+=2;
1010
1011         /* load the server hello data */
1012         /* load the server random */
1013         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
1014         p+=SSL3_RANDOM_SIZE;
1015
1016         /* get the session-id */
1017         j= *(p++);
1018
1019         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
1020                 {
1021                 al=SSL_AD_ILLEGAL_PARAMETER;
1022                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
1023                 goto f_err;
1024                 }
1025
1026 #ifndef OPENSSL_NO_TLSEXT
1027         /* check if we want to resume the session based on external pre-shared secret */
1028         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1029                 {
1030                 SSL_CIPHER *pref_cipher=NULL;
1031                 s->session->master_key_length=sizeof(s->session->master_key);
1032                 if (s->tls_session_secret_cb(s, s->session->master_key,
1033                                              &s->session->master_key_length,
1034                                              NULL, &pref_cipher,
1035                                              s->tls_session_secret_cb_arg))
1036                         {
1037                         s->session->cipher = pref_cipher ?
1038                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
1039                         }
1040                 }
1041 #endif /* OPENSSL_NO_TLSEXT */
1042
1043         if (j != 0 && j == s->session->session_id_length
1044             && memcmp(p,s->session->session_id,j) == 0)
1045             {
1046             if(s->sid_ctx_length != s->session->sid_ctx_length
1047                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
1048                 {
1049                 /* actually a client application bug */
1050                 al=SSL_AD_ILLEGAL_PARAMETER;
1051                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1052                 goto f_err;
1053                 }
1054             s->hit=1;
1055             }
1056         else    /* a miss or crap from the other end */
1057                 {
1058                 /* If we were trying for session-id reuse, make a new
1059                  * SSL_SESSION so we don't stuff up other people */
1060                 s->hit=0;
1061                 if (s->session->session_id_length > 0)
1062                         {
1063                         if (!ssl_get_new_session(s,0))
1064                                 {
1065                                 goto f_err;
1066                                 }
1067                         }
1068                 s->session->session_id_length=j;
1069                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1070                 }
1071         p+=j;
1072         c=ssl_get_cipher_by_char(s,p);
1073         if (c == NULL)
1074                 {
1075                 /* unknown cipher */
1076                 al=SSL_AD_ILLEGAL_PARAMETER;
1077                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1078                 goto f_err;
1079                 }
1080         /* Set version disabled mask now we know version */
1081         if (!SSL_USE_TLS1_2_CIPHERS(s))
1082                 ct->mask_ssl = SSL_TLSV1_2;
1083         else
1084                 ct->mask_ssl = 0;
1085         /* If it is a disabled cipher we didn't send it in client hello,
1086          * so return an error.
1087          */
1088         if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK))
1089                 {
1090                 al=SSL_AD_ILLEGAL_PARAMETER;
1091                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1092                 goto f_err;
1093                 }
1094         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1095
1096         sk=ssl_get_ciphers_by_id(s);
1097         i=sk_SSL_CIPHER_find(sk,c);
1098         if (i < 0)
1099                 {
1100                 /* we did not say we would use this cipher */
1101                 al=SSL_AD_ILLEGAL_PARAMETER;
1102                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1103                 goto f_err;
1104                 }
1105
1106         /* Depending on the session caching (internal/external), the cipher
1107            and/or cipher_id values may not be set. Make sure that
1108            cipher_id is set and use it for comparison. */
1109         if (s->session->cipher)
1110                 s->session->cipher_id = s->session->cipher->id;
1111         if (s->hit && (s->session->cipher_id != c->id))
1112                 {
1113 /* Workaround is now obsolete */
1114 #if 0
1115                 if (!(s->options &
1116                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1117 #endif
1118                         {
1119                         al=SSL_AD_ILLEGAL_PARAMETER;
1120                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1121                         goto f_err;
1122                         }
1123                 }
1124         s->s3->tmp.new_cipher=c;
1125         /* Don't digest cached records if no sigalgs: we may need them for
1126          * client authentication.
1127          */
1128         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1129                 goto f_err;
1130         /* lets get the compression algorithm */
1131         /* COMPRESSION */
1132 #ifdef OPENSSL_NO_COMP
1133         if (*(p++) != 0)
1134                 {
1135                 al=SSL_AD_ILLEGAL_PARAMETER;
1136                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1137                 goto f_err;
1138                 }
1139         /* If compression is disabled we'd better not try to resume a session
1140          * using compression.
1141          */
1142         if (s->session->compress_meth != 0)
1143                 {
1144                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1145                 goto f_err;
1146                 }
1147 #else
1148         j= *(p++);
1149         if (s->hit && j != s->session->compress_meth)
1150                 {
1151                 al=SSL_AD_ILLEGAL_PARAMETER;
1152                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1153                 goto f_err;
1154                 }
1155         if (j == 0)
1156                 comp=NULL;
1157         else if (!ssl_allow_compression(s))
1158                 {
1159                 al=SSL_AD_ILLEGAL_PARAMETER;
1160                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1161                 goto f_err;
1162                 }
1163         else
1164                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1165         
1166         if ((j != 0) && (comp == NULL))
1167                 {
1168                 al=SSL_AD_ILLEGAL_PARAMETER;
1169                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1170                 goto f_err;
1171                 }
1172         else
1173                 {
1174                 s->s3->tmp.new_compression=comp;
1175                 }
1176 #endif
1177
1178 #ifndef OPENSSL_NO_TLSEXT
1179         /* TLS extensions*/
1180         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1181                 {
1182                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1183                 goto err; 
1184                 }
1185 #endif
1186
1187         if (p != (d+n))
1188                 {
1189                 /* wrong packet length */
1190                 al=SSL_AD_DECODE_ERROR;
1191                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1192                 goto f_err;
1193                 }
1194
1195         return(1);
1196 f_err:
1197         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1198 err:
1199         return(-1);
1200         }
1201
1202 int ssl3_get_server_certificate(SSL *s)
1203         {
1204         int al,i,ok,ret= -1;
1205         unsigned long n,nc,llen,l;
1206         X509 *x=NULL;
1207         const unsigned char *q,*p;
1208         unsigned char *d;
1209         STACK_OF(X509) *sk=NULL;
1210         SESS_CERT *sc;
1211         EVP_PKEY *pkey=NULL;
1212         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1213
1214         n=s->method->ssl_get_message(s,
1215                 SSL3_ST_CR_CERT_A,
1216                 SSL3_ST_CR_CERT_B,
1217                 -1,
1218                 s->max_cert_list,
1219                 &ok);
1220
1221         if (!ok) return((int)n);
1222
1223         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1224                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 
1225                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1226                 {
1227                 s->s3->tmp.reuse_message=1;
1228                 return(1);
1229                 }
1230
1231         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1232                 {
1233                 al=SSL_AD_UNEXPECTED_MESSAGE;
1234                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1235                 goto f_err;
1236                 }
1237         p=d=(unsigned char *)s->init_msg;
1238
1239         if ((sk=sk_X509_new_null()) == NULL)
1240                 {
1241                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1242                 goto err;
1243                 }
1244
1245         n2l3(p,llen);
1246         if (llen+3 != n)
1247                 {
1248                 al=SSL_AD_DECODE_ERROR;
1249                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1250                 goto f_err;
1251                 }
1252         for (nc=0; nc<llen; )
1253                 {
1254                 n2l3(p,l);
1255                 if ((l+nc+3) > llen)
1256                         {
1257                         al=SSL_AD_DECODE_ERROR;
1258                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1259                         goto f_err;
1260                         }
1261
1262                 q=p;
1263                 x=d2i_X509(NULL,&q,l);
1264                 if (x == NULL)
1265                         {
1266                         al=SSL_AD_BAD_CERTIFICATE;
1267                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1268                         goto f_err;
1269                         }
1270                 if (q != (p+l))
1271                         {
1272                         al=SSL_AD_DECODE_ERROR;
1273                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1274                         goto f_err;
1275                         }
1276                 if (!sk_X509_push(sk,x))
1277                         {
1278                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1279                         goto err;
1280                         }
1281                 x=NULL;
1282                 nc+=l+3;
1283                 p=q;
1284                 }
1285
1286         i=ssl_verify_cert_chain(s,sk);
1287         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1288 #ifndef OPENSSL_NO_KRB5
1289             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1290                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1291 #endif /* OPENSSL_NO_KRB5 */
1292                 )
1293                 {
1294                 al=ssl_verify_alarm_type(s->verify_result);
1295                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1296                 goto f_err; 
1297                 }
1298         ERR_clear_error(); /* but we keep s->verify_result */
1299         if (i > 1)
1300                 {
1301                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1302                 al = SSL_AD_HANDSHAKE_FAILURE;
1303                 goto f_err;
1304                 }
1305
1306         sc=ssl_sess_cert_new();
1307         if (sc == NULL) goto err;
1308
1309         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1310         s->session->sess_cert=sc;
1311
1312         sc->cert_chain=sk;
1313         /* Inconsistency alert: cert_chain does include the peer's
1314          * certificate, which we don't include in s3_srvr.c */
1315         x=sk_X509_value(sk,0);
1316         sk=NULL;
1317         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1318
1319         pkey=X509_get_pubkey(x);
1320
1321         /* VRS: allow null cert if auth == KRB5 */
1322         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1323                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1324                     ? 0 : 1;
1325
1326 #ifdef KSSL_DEBUG
1327         printf("pkey,x = %p, %p\n", pkey,x);
1328         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1329         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1330                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1331 #endif    /* KSSL_DEBUG */
1332
1333         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1334                 {
1335                 x=NULL;
1336                 al=SSL3_AL_FATAL;
1337                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1338                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1339                 goto f_err;
1340                 }
1341
1342         i=ssl_cert_type(x,pkey);
1343         if (need_cert && i < 0)
1344                 {
1345                 x=NULL;
1346                 al=SSL3_AL_FATAL;
1347                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1348                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1349                 goto f_err;
1350                 }
1351
1352         if (need_cert)
1353                 {
1354                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1355                 if (exp_idx >= 0 && i != exp_idx)
1356                         {
1357                         x=NULL;
1358                         al=SSL_AD_ILLEGAL_PARAMETER;
1359                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1360                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1361                         goto f_err;
1362                         }
1363                 sc->peer_cert_type=i;
1364                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1365                 /* Why would the following ever happen?
1366                  * We just created sc a couple of lines ago. */
1367                 if (sc->peer_pkeys[i].x509 != NULL)
1368                         X509_free(sc->peer_pkeys[i].x509);
1369                 sc->peer_pkeys[i].x509=x;
1370                 sc->peer_key= &(sc->peer_pkeys[i]);
1371
1372                 if (s->session->peer != NULL)
1373                         X509_free(s->session->peer);
1374                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1375                 s->session->peer=x;
1376                 }
1377         else
1378                 {
1379                 sc->peer_cert_type=i;
1380                 sc->peer_key= NULL;
1381
1382                 if (s->session->peer != NULL)
1383                         X509_free(s->session->peer);
1384                 s->session->peer=NULL;
1385                 }
1386         s->session->verify_result = s->verify_result;
1387
1388         x=NULL;
1389         ret=1;
1390         if (0)
1391                 {
1392 f_err:
1393                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1394                 }
1395 err:
1396         EVP_PKEY_free(pkey);
1397         X509_free(x);
1398         sk_X509_pop_free(sk,X509_free);
1399         return(ret);
1400         }
1401
1402 int ssl3_get_key_exchange(SSL *s)
1403         {
1404 #ifndef OPENSSL_NO_RSA
1405         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1406 #endif
1407         EVP_MD_CTX md_ctx;
1408         unsigned char *param,*p;
1409         int al,i,j,param_len,ok;
1410         long n,alg_k,alg_a;
1411         EVP_PKEY *pkey=NULL;
1412         const EVP_MD *md = NULL;
1413 #ifndef OPENSSL_NO_RSA
1414         RSA *rsa=NULL;
1415 #endif
1416 #ifndef OPENSSL_NO_DH
1417         DH *dh=NULL;
1418 #endif
1419 #ifndef OPENSSL_NO_ECDH
1420         EC_KEY *ecdh = NULL;
1421         BN_CTX *bn_ctx = NULL;
1422         EC_POINT *srvr_ecpoint = NULL;
1423         int curve_nid = 0;
1424         int encoded_pt_len = 0;
1425 #endif
1426
1427         /* use same message size as in ssl3_get_certificate_request()
1428          * as ServerKeyExchange message may be skipped */
1429         n=s->method->ssl_get_message(s,
1430                 SSL3_ST_CR_KEY_EXCH_A,
1431                 SSL3_ST_CR_KEY_EXCH_B,
1432                 -1,
1433                 s->max_cert_list,
1434                 &ok);
1435         if (!ok) return((int)n);
1436
1437         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1438                 {
1439 #ifndef OPENSSL_NO_PSK
1440                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1441                    omitted if no identity hint is sent. Set
1442                    session->sess_cert anyway to avoid problems
1443                    later.*/
1444                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1445                         {
1446                         s->session->sess_cert=ssl_sess_cert_new();
1447                         if (s->ctx->psk_identity_hint)
1448                                 OPENSSL_free(s->ctx->psk_identity_hint);
1449                         s->ctx->psk_identity_hint = NULL;
1450                         }
1451 #endif
1452                 s->s3->tmp.reuse_message=1;
1453                 return(1);
1454                 }
1455
1456         param=p=(unsigned char *)s->init_msg;
1457         if (s->session->sess_cert != NULL)
1458                 {
1459 #ifndef OPENSSL_NO_RSA
1460                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1461                         {
1462                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1463                         s->session->sess_cert->peer_rsa_tmp=NULL;
1464                         }
1465 #endif
1466 #ifndef OPENSSL_NO_DH
1467                 if (s->session->sess_cert->peer_dh_tmp)
1468                         {
1469                         DH_free(s->session->sess_cert->peer_dh_tmp);
1470                         s->session->sess_cert->peer_dh_tmp=NULL;
1471                         }
1472 #endif
1473 #ifndef OPENSSL_NO_ECDH
1474                 if (s->session->sess_cert->peer_ecdh_tmp)
1475                         {
1476                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1477                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1478                         }
1479 #endif
1480                 }
1481         else
1482                 {
1483                 s->session->sess_cert=ssl_sess_cert_new();
1484                 }
1485
1486         param_len=0;
1487         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1488         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1489         EVP_MD_CTX_init(&md_ctx);
1490
1491 #ifndef OPENSSL_NO_PSK
1492         if (alg_k & SSL_kPSK)
1493                 {
1494                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1495
1496                 al=SSL_AD_HANDSHAKE_FAILURE;
1497                 n2s(p,i);
1498                 param_len=i+2;
1499                 /* Store PSK identity hint for later use, hint is used
1500                  * in ssl3_send_client_key_exchange.  Assume that the
1501                  * maximum length of a PSK identity hint can be as
1502                  * long as the maximum length of a PSK identity. */
1503                 if (i > PSK_MAX_IDENTITY_LEN)
1504                         {
1505                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1506                                 SSL_R_DATA_LENGTH_TOO_LONG);
1507                         goto f_err;
1508                         }
1509                 if (param_len > n)
1510                         {
1511                         al=SSL_AD_DECODE_ERROR;
1512                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1513                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1514                         goto f_err;
1515                         }
1516                 /* If received PSK identity hint contains NULL
1517                  * characters, the hint is truncated from the first
1518                  * NULL. p may not be ending with NULL, so create a
1519                  * NULL-terminated string. */
1520                 memcpy(tmp_id_hint, p, i);
1521                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1522                 if (s->ctx->psk_identity_hint != NULL)
1523                         OPENSSL_free(s->ctx->psk_identity_hint);
1524                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1525                 if (s->ctx->psk_identity_hint == NULL)
1526                         {
1527                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1528                         goto f_err;
1529                         }          
1530
1531                 p+=i;
1532                 n-=param_len;
1533                 }
1534         else
1535 #endif /* !OPENSSL_NO_PSK */
1536 #ifndef OPENSSL_NO_SRP
1537         if (alg_k & SSL_kSRP)
1538                 {
1539                 n2s(p,i);
1540                 param_len=i+2;
1541                 if (param_len > n)
1542                         {
1543                         al=SSL_AD_DECODE_ERROR;
1544                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1545                         goto f_err;
1546                         }
1547                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1548                         {
1549                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1550                         goto err;
1551                         }
1552                 p+=i;
1553
1554                 n2s(p,i);
1555                 param_len+=i+2;
1556                 if (param_len > n)
1557                         {
1558                         al=SSL_AD_DECODE_ERROR;
1559                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1560                         goto f_err;
1561                         }
1562                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1563                         {
1564                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1565                         goto err;
1566                         }
1567                 p+=i;
1568
1569                 i = (unsigned int)(p[0]);
1570                 p++;
1571                 param_len+=i+1;
1572                 if (param_len > n)
1573                         {
1574                         al=SSL_AD_DECODE_ERROR;
1575                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1576                         goto f_err;
1577                         }
1578                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1579                         {
1580                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1581                         goto err;
1582                         }
1583                 p+=i;
1584
1585                 n2s(p,i);
1586                 param_len+=i+2;
1587                 if (param_len > n)
1588                         {
1589                         al=SSL_AD_DECODE_ERROR;
1590                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1591                         goto f_err;
1592                         }
1593                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1594                         {
1595                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1596                         goto err;
1597                         }
1598                 p+=i;
1599                 n-=param_len;
1600
1601 /* We must check if there is a certificate */
1602 #ifndef OPENSSL_NO_RSA
1603                 if (alg_a & SSL_aRSA)
1604                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1605 #else
1606                 if (0)
1607                         ;
1608 #endif
1609 #ifndef OPENSSL_NO_DSA
1610                 else if (alg_a & SSL_aDSS)
1611                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1612 #endif
1613                 }
1614         else
1615 #endif /* !OPENSSL_NO_SRP */
1616 #ifndef OPENSSL_NO_RSA
1617         if (alg_k & SSL_kRSA)
1618                 {
1619                 if ((rsa=RSA_new()) == NULL)
1620                         {
1621                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1622                         goto err;
1623                         }
1624                 n2s(p,i);
1625                 param_len=i+2;
1626                 if (param_len > n)
1627                         {
1628                         al=SSL_AD_DECODE_ERROR;
1629                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1630                         goto f_err;
1631                         }
1632                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1633                         {
1634                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1635                         goto err;
1636                         }
1637                 p+=i;
1638
1639                 n2s(p,i);
1640                 param_len+=i+2;
1641                 if (param_len > n)
1642                         {
1643                         al=SSL_AD_DECODE_ERROR;
1644                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1645                         goto f_err;
1646                         }
1647                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1648                         {
1649                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1650                         goto err;
1651                         }
1652                 p+=i;
1653                 n-=param_len;
1654
1655                 /* this should be because we are using an export cipher */
1656                 if (alg_a & SSL_aRSA)
1657                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1658                 else
1659                         {
1660                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1661                         goto err;
1662                         }
1663                 s->session->sess_cert->peer_rsa_tmp=rsa;
1664                 rsa=NULL;
1665                 }
1666 #else /* OPENSSL_NO_RSA */
1667         if (0)
1668                 ;
1669 #endif
1670 #ifndef OPENSSL_NO_DH
1671         else if (alg_k & SSL_kDHE)
1672                 {
1673                 if ((dh=DH_new()) == NULL)
1674                         {
1675                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1676                         goto err;
1677                         }
1678                 n2s(p,i);
1679                 param_len=i+2;
1680                 if (param_len > n)
1681                         {
1682                         al=SSL_AD_DECODE_ERROR;
1683                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1684                         goto f_err;
1685                         }
1686                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1687                         {
1688                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1689                         goto err;
1690                         }
1691                 p+=i;
1692
1693                 n2s(p,i);
1694                 param_len+=i+2;
1695                 if (param_len > n)
1696                         {
1697                         al=SSL_AD_DECODE_ERROR;
1698                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1699                         goto f_err;
1700                         }
1701                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1702                         {
1703                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1704                         goto err;
1705                         }
1706                 p+=i;
1707
1708                 n2s(p,i);
1709                 param_len+=i+2;
1710                 if (param_len > n)
1711                         {
1712                         al=SSL_AD_DECODE_ERROR;
1713                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1714                         goto f_err;
1715                         }
1716                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1717                         {
1718                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1719                         goto err;
1720                         }
1721                 p+=i;
1722                 n-=param_len;
1723
1724                 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1725                                                 DH_security_bits(dh), 0, dh))
1726                         {
1727                         al=SSL_AD_HANDSHAKE_FAILURE;
1728                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_DH_KEY_TOO_SMALL);
1729                         goto f_err;
1730                         }
1731
1732 #ifndef OPENSSL_NO_RSA
1733                 if (alg_a & SSL_aRSA)
1734                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1735 #else
1736                 if (0)
1737                         ;
1738 #endif
1739 #ifndef OPENSSL_NO_DSA
1740                 else if (alg_a & SSL_aDSS)
1741                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1742 #endif
1743                 /* else anonymous DH, so no certificate or pkey. */
1744
1745                 s->session->sess_cert->peer_dh_tmp=dh;
1746                 dh=NULL;
1747                 }
1748         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1749                 {
1750                 al=SSL_AD_ILLEGAL_PARAMETER;
1751                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1752                 goto f_err;
1753                 }
1754 #endif /* !OPENSSL_NO_DH */
1755
1756 #ifndef OPENSSL_NO_ECDH
1757         else if (alg_k & SSL_kECDHE)
1758                 {
1759                 EC_GROUP *ngroup;
1760                 const EC_GROUP *group;
1761
1762                 if ((ecdh=EC_KEY_new()) == NULL)
1763                         {
1764                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1765                         goto err;
1766                         }
1767
1768                 /* Extract elliptic curve parameters and the
1769                  * server's ephemeral ECDH public key.
1770                  * Keep accumulating lengths of various components in
1771                  * param_len and make sure it never exceeds n.
1772                  */
1773
1774                 /* XXX: For now we only support named (not generic) curves
1775                  * and the ECParameters in this case is just three bytes.
1776                  */
1777                 param_len=3;
1778                 /* Check curve is one of our preferences, if not server has
1779                  * sent an invalid curve.
1780                  */
1781                 if (!tls1_check_curve(s, p, param_len))
1782                         {
1783                         al=SSL_AD_DECODE_ERROR;
1784                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1785                         goto f_err;
1786                         }
1787
1788                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) 
1789                         {
1790                         al=SSL_AD_INTERNAL_ERROR;
1791                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1792                         goto f_err;
1793                         }
1794
1795                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1796                 if (ngroup == NULL)
1797                         {
1798                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1799                         goto err;
1800                         }
1801                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1802                         {
1803                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1804                         goto err;
1805                         }
1806                 EC_GROUP_free(ngroup);
1807
1808                 group = EC_KEY_get0_group(ecdh);
1809
1810                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1811                     (EC_GROUP_get_degree(group) > 163))
1812                         {
1813                         al=SSL_AD_EXPORT_RESTRICTION;
1814                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1815                         goto f_err;
1816                         }
1817
1818                 p+=3;
1819
1820                 /* Next, get the encoded ECPoint */
1821                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1822                     ((bn_ctx = BN_CTX_new()) == NULL))
1823                         {
1824                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1825                         goto err;
1826                         }
1827
1828                 encoded_pt_len = *p;  /* length of encoded point */
1829                 p+=1;
1830                 param_len += (1 + encoded_pt_len);
1831                 if ((param_len > n) ||
1832                     (EC_POINT_oct2point(group, srvr_ecpoint, 
1833                         p, encoded_pt_len, bn_ctx) == 0))
1834                         {
1835                         al=SSL_AD_DECODE_ERROR;
1836                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1837                         goto f_err;
1838                         }
1839
1840                 n-=param_len;
1841                 p+=encoded_pt_len;
1842
1843                 /* The ECC/TLS specification does not mention
1844                  * the use of DSA to sign ECParameters in the server
1845                  * key exchange message. We do support RSA and ECDSA.
1846                  */
1847                 if (0) ;
1848 #ifndef OPENSSL_NO_RSA
1849                 else if (alg_a & SSL_aRSA)
1850                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1851 #endif
1852 #ifndef OPENSSL_NO_ECDSA
1853                 else if (alg_a & SSL_aECDSA)
1854                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1855 #endif
1856                 /* else anonymous ECDH, so no certificate or pkey. */
1857                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1858                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1859                 ecdh=NULL;
1860                 BN_CTX_free(bn_ctx);
1861                 bn_ctx = NULL;
1862                 EC_POINT_free(srvr_ecpoint);
1863                 srvr_ecpoint = NULL;
1864                 }
1865         else if (alg_k)
1866                 {
1867                 al=SSL_AD_UNEXPECTED_MESSAGE;
1868                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1869                 goto f_err;
1870                 }
1871 #endif /* !OPENSSL_NO_ECDH */
1872
1873
1874         /* p points to the next byte, there are 'n' bytes left */
1875
1876         /* if it was signed, check the signature */
1877         if (pkey != NULL)
1878                 {
1879                 if (SSL_USE_SIGALGS(s))
1880                         {
1881                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1882                         if (rv == -1)
1883                                 goto err;
1884                         else if (rv == 0)
1885                                 {
1886                                 al = SSL_AD_DECODE_ERROR;
1887                                 goto f_err;
1888                                 }
1889 #ifdef SSL_DEBUG
1890 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1891 #endif
1892                         p += 2;
1893                         n -= 2;
1894                         }
1895                 else
1896                         md = EVP_sha1();
1897                         
1898                 n2s(p,i);
1899                 n-=2;
1900                 j=EVP_PKEY_size(pkey);
1901
1902                 if ((i != n) || (n > j) || (n <= 0))
1903                         {
1904                         /* wrong packet length */
1905                         al=SSL_AD_DECODE_ERROR;
1906                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1907                         goto f_err;
1908                         }
1909
1910 #ifndef OPENSSL_NO_RSA
1911                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1912                         {
1913                         int num;
1914
1915                         j=0;
1916                         q=md_buf;
1917                         for (num=2; num > 0; num--)
1918                                 {
1919                                 EVP_MD_CTX_set_flags(&md_ctx,
1920                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1921                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1922                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1923                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1924                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1925                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1926                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1927                                 q+=i;
1928                                 j+=i;
1929                                 }
1930                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1931                                                                 pkey->pkey.rsa);
1932                         if (i < 0)
1933                                 {
1934                                 al=SSL_AD_DECRYPT_ERROR;
1935                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1936                                 goto f_err;
1937                                 }
1938                         if (i == 0)
1939                                 {
1940                                 /* bad signature */
1941                                 al=SSL_AD_DECRYPT_ERROR;
1942                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1943                                 goto f_err;
1944                                 }
1945                         }
1946                 else
1947 #endif
1948                         {
1949                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1950                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1951                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1952                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1953                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1954                                 {
1955                                 /* bad signature */
1956                                 al=SSL_AD_DECRYPT_ERROR;
1957                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1958                                 goto f_err;
1959                                 }
1960                         }
1961                 }
1962         else
1963                 {
1964                 /* aNULL or kPSK do not need public keys */
1965                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1966                         {
1967                         /* Might be wrong key type, check it */
1968                         if (ssl3_check_cert_and_algorithm(s))
1969                                 /* Otherwise this shouldn't happen */
1970                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1971                         goto err;
1972                         }
1973                 /* still data left over */
1974                 if (n != 0)
1975                         {
1976                         al=SSL_AD_DECODE_ERROR;
1977                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1978                         goto f_err;
1979                         }
1980                 }
1981         EVP_PKEY_free(pkey);
1982         EVP_MD_CTX_cleanup(&md_ctx);
1983         return(1);
1984 f_err:
1985         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1986 err:
1987         EVP_PKEY_free(pkey);
1988 #ifndef OPENSSL_NO_RSA
1989         if (rsa != NULL)
1990                 RSA_free(rsa);
1991 #endif
1992 #ifndef OPENSSL_NO_DH
1993         if (dh != NULL)
1994                 DH_free(dh);
1995 #endif
1996 #ifndef OPENSSL_NO_ECDH
1997         BN_CTX_free(bn_ctx);
1998         EC_POINT_free(srvr_ecpoint);
1999         if (ecdh != NULL)
2000                 EC_KEY_free(ecdh);
2001 #endif
2002         EVP_MD_CTX_cleanup(&md_ctx);
2003         return(-1);
2004         }
2005
2006 int ssl3_get_certificate_request(SSL *s)
2007         {
2008         int ok,ret=0;
2009         unsigned long n,nc,l;
2010         unsigned int llen, ctype_num,i;
2011         X509_NAME *xn=NULL;
2012         const unsigned char *p,*q;
2013         unsigned char *d;
2014         STACK_OF(X509_NAME) *ca_sk=NULL;
2015
2016         n=s->method->ssl_get_message(s,
2017                 SSL3_ST_CR_CERT_REQ_A,
2018                 SSL3_ST_CR_CERT_REQ_B,
2019                 -1,
2020                 s->max_cert_list,
2021                 &ok);
2022
2023         if (!ok) return((int)n);
2024
2025         s->s3->tmp.cert_req=0;
2026
2027         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2028                 {
2029                 s->s3->tmp.reuse_message=1;
2030                 /* If we get here we don't need any cached handshake records
2031                  * as we wont be doing client auth.
2032                  */
2033                 if (s->s3->handshake_buffer)
2034                         {
2035                         if (!ssl3_digest_cached_records(s))
2036                                 goto err;
2037                         }
2038                 return(1);
2039                 }
2040
2041         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2042                 {
2043                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2044                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2045                 goto err;
2046                 }
2047
2048         /* TLS does not like anon-DH with client cert */
2049         if (s->version > SSL3_VERSION)
2050                 {
2051                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2052                         {
2053                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2054                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2055                         goto err;
2056                         }
2057                 }
2058
2059         p=d=(unsigned char *)s->init_msg;
2060
2061         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2062                 {
2063                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2064                 goto err;
2065                 }
2066
2067         /* get the certificate types */
2068         ctype_num= *(p++);
2069         if (s->cert->ctypes)
2070                 {
2071                 OPENSSL_free(s->cert->ctypes);
2072                 s->cert->ctypes = NULL;
2073                 }
2074         if (ctype_num > SSL3_CT_NUMBER)
2075                 {
2076                 /* If we exceed static buffer copy all to cert structure */
2077                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2078                 memcpy(s->cert->ctypes, p, ctype_num);
2079                 s->cert->ctype_num = (size_t)ctype_num;
2080                 ctype_num=SSL3_CT_NUMBER;
2081                 }
2082         for (i=0; i<ctype_num; i++)
2083                 s->s3->tmp.ctype[i]= p[i];
2084         p+=p[-1];
2085         if (SSL_USE_SIGALGS(s))
2086                 {
2087                 n2s(p, llen);
2088                 /* Check we have enough room for signature algorithms and
2089                  * following length value.
2090                  */
2091                 if ((unsigned long)(p - d + llen + 2) > n)
2092                         {
2093                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2094                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2095                         goto err;
2096                         }
2097                 /* Clear certificate digests and validity flags */
2098                 for (i = 0; i < SSL_PKEY_NUM; i++)
2099                         {
2100                         s->cert->pkeys[i].digest = NULL;
2101                         s->cert->pkeys[i].valid_flags = 0;
2102                         }
2103                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
2104                         {
2105                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2106                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2107                         goto err;
2108                         }
2109                 p += llen;
2110                 }
2111
2112         /* get the CA RDNs */
2113         n2s(p,llen);
2114 #if 0
2115 {
2116 FILE *out;
2117 out=fopen("/tmp/vsign.der","w");
2118 fwrite(p,1,llen,out);
2119 fclose(out);
2120 }
2121 #endif
2122
2123         if ((unsigned long)(p - d + llen) != n)
2124                 {
2125                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2126                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2127                 goto err;
2128                 }
2129
2130         for (nc=0; nc<llen; )
2131                 {
2132                 n2s(p,l);
2133                 if ((l+nc+2) > llen)
2134                         {
2135                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2136                                 goto cont; /* netscape bugs */
2137                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2138                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2139                         goto err;
2140                         }
2141
2142                 q=p;
2143
2144                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2145                         {
2146                         /* If netscape tolerance is on, ignore errors */
2147                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2148                                 goto cont;
2149                         else
2150                                 {
2151                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2152                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2153                                 goto err;
2154                                 }
2155                         }
2156
2157                 if (q != (p+l))
2158                         {
2159                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2160                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2161                         goto err;
2162                         }
2163                 if (!sk_X509_NAME_push(ca_sk,xn))
2164                         {
2165                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2166                         goto err;
2167                         }
2168
2169                 p+=l;
2170                 nc+=l+2;
2171                 }
2172
2173         if (0)
2174                 {
2175 cont:
2176                 ERR_clear_error();
2177                 }
2178
2179         /* we should setup a certificate to return.... */
2180         s->s3->tmp.cert_req=1;
2181         s->s3->tmp.ctype_num=ctype_num;
2182         if (s->s3->tmp.ca_names != NULL)
2183                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2184         s->s3->tmp.ca_names=ca_sk;
2185         ca_sk=NULL;
2186
2187         ret=1;
2188 err:
2189         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2190         return(ret);
2191         }
2192
2193 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2194         {
2195         return(X509_NAME_cmp(*a,*b));
2196         }
2197 #ifndef OPENSSL_NO_TLSEXT
2198 int ssl3_get_new_session_ticket(SSL *s)
2199         {
2200         int ok,al,ret=0, ticklen;
2201         long n;
2202         const unsigned char *p;
2203         unsigned char *d;
2204
2205         n=s->method->ssl_get_message(s,
2206                 SSL3_ST_CR_SESSION_TICKET_A,
2207                 SSL3_ST_CR_SESSION_TICKET_B,
2208                 -1,
2209                 16384,
2210                 &ok);
2211
2212         if (!ok)
2213                 return((int)n);
2214
2215         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2216                 {
2217                 s->s3->tmp.reuse_message=1;
2218                 return(1);
2219                 }
2220         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2221                 {
2222                 al=SSL_AD_UNEXPECTED_MESSAGE;
2223                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2224                 goto f_err;
2225                 }
2226         if (n < 6)
2227                 {
2228                 /* need at least ticket_lifetime_hint + ticket length */
2229                 al = SSL_AD_DECODE_ERROR;
2230                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2231                 goto f_err;
2232                 }
2233
2234         p=d=(unsigned char *)s->init_msg;
2235         n2l(p, s->session->tlsext_tick_lifetime_hint);
2236         n2s(p, ticklen);
2237         /* ticket_lifetime_hint + ticket_length + ticket */
2238         if (ticklen + 6 != n)
2239                 {
2240                 al = SSL_AD_DECODE_ERROR;
2241                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2242                 goto f_err;
2243                 }
2244         if (s->session->tlsext_tick)
2245                 {
2246                 OPENSSL_free(s->session->tlsext_tick);
2247                 s->session->tlsext_ticklen = 0;
2248                 }
2249         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2250         if (!s->session->tlsext_tick)
2251                 {
2252                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2253                 goto err;
2254                 }
2255         memcpy(s->session->tlsext_tick, p, ticklen);
2256         s->session->tlsext_ticklen = ticklen;
2257         /* There are two ways to detect a resumed ticket sesion.
2258          * One is to set an appropriate session ID and then the server
2259          * must return a match in ServerHello. This allows the normal
2260          * client session ID matching to work and we know much 
2261          * earlier that the ticket has been accepted.
2262          * 
2263          * The other way is to set zero length session ID when the
2264          * ticket is presented and rely on the handshake to determine
2265          * session resumption.
2266          *
2267          * We choose the former approach because this fits in with
2268          * assumptions elsewhere in OpenSSL. The session ID is set
2269          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2270          * ticket.
2271          */ 
2272         EVP_Digest(p, ticklen,
2273                         s->session->session_id, &s->session->session_id_length,
2274 #ifndef OPENSSL_NO_SHA256
2275                                                         EVP_sha256(), NULL);
2276 #else
2277                                                         EVP_sha1(), NULL);
2278 #endif
2279         ret=1;
2280         return(ret);
2281 f_err:
2282         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2283 err:
2284         return(-1);
2285         }
2286
2287 int ssl3_get_cert_status(SSL *s)
2288         {
2289         int ok, al;
2290         unsigned long resplen,n;
2291         const unsigned char *p;
2292
2293         n=s->method->ssl_get_message(s,
2294                 SSL3_ST_CR_CERT_STATUS_A,
2295                 SSL3_ST_CR_CERT_STATUS_B,
2296                 SSL3_MT_CERTIFICATE_STATUS,
2297                 16384,
2298                 &ok);
2299
2300         if (!ok) return((int)n);
2301         if (n < 4)
2302                 {
2303                 /* need at least status type + length */
2304                 al = SSL_AD_DECODE_ERROR;
2305                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2306                 goto f_err;
2307                 }
2308         p = (unsigned char *)s->init_msg;
2309         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2310                 {
2311                 al = SSL_AD_DECODE_ERROR;
2312                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2313                 goto f_err;
2314                 }
2315         n2l3(p, resplen);
2316         if (resplen + 4 != n)
2317                 {
2318                 al = SSL_AD_DECODE_ERROR;
2319                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2320                 goto f_err;
2321                 }
2322         if (s->tlsext_ocsp_resp)
2323                 OPENSSL_free(s->tlsext_ocsp_resp);
2324         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2325         if (!s->tlsext_ocsp_resp)
2326                 {
2327                 al = SSL_AD_INTERNAL_ERROR;
2328                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2329                 goto f_err;
2330                 }
2331         s->tlsext_ocsp_resplen = resplen;
2332         if (s->ctx->tlsext_status_cb)
2333                 {
2334                 int ret;
2335                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2336                 if (ret == 0)
2337                         {
2338                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2339                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2340                         goto f_err;
2341                         }
2342                 if (ret < 0)
2343                         {
2344                         al = SSL_AD_INTERNAL_ERROR;
2345                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2346                         goto f_err;
2347                         }
2348                 }
2349         return 1;
2350 f_err:
2351         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2352         return(-1);
2353         }
2354 #endif
2355
2356 int ssl3_get_server_done(SSL *s)
2357         {
2358         int ok,ret=0;
2359         long n;
2360
2361         n=s->method->ssl_get_message(s,
2362                 SSL3_ST_CR_SRVR_DONE_A,
2363                 SSL3_ST_CR_SRVR_DONE_B,
2364                 SSL3_MT_SERVER_DONE,
2365                 30, /* should be very small, like 0 :-) */
2366                 &ok);
2367
2368         if (!ok) return((int)n);
2369         if (n > 0)
2370                 {
2371                 /* should contain no data */
2372                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2373                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2374                 return -1;
2375                 }
2376         ret=1;
2377         return(ret);
2378         }
2379
2380
2381 int ssl3_send_client_key_exchange(SSL *s)
2382         {
2383         unsigned char *p;
2384         int n;
2385         unsigned long alg_k;
2386 #ifndef OPENSSL_NO_RSA
2387         unsigned char *q;
2388         EVP_PKEY *pkey=NULL;
2389 #endif
2390 #ifndef OPENSSL_NO_KRB5
2391         KSSL_ERR kssl_err;
2392 #endif /* OPENSSL_NO_KRB5 */
2393 #ifndef OPENSSL_NO_ECDH
2394         EC_KEY *clnt_ecdh = NULL;
2395         const EC_POINT *srvr_ecpoint = NULL;
2396         EVP_PKEY *srvr_pub_pkey = NULL;
2397         unsigned char *encodedPoint = NULL;
2398         int encoded_pt_len = 0;
2399         BN_CTX * bn_ctx = NULL;
2400 #endif
2401
2402         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2403                 {
2404                 p = ssl_handshake_start(s);
2405
2406                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2407
2408                 /* Fool emacs indentation */
2409                 if (0) {}
2410 #ifndef OPENSSL_NO_RSA
2411                 else if (alg_k & SSL_kRSA)
2412                         {
2413                         RSA *rsa;
2414                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2415
2416                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2417                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2418                         else
2419                                 {
2420                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2421                                 if ((pkey == NULL) ||
2422                                         (pkey->type != EVP_PKEY_RSA) ||
2423                                         (pkey->pkey.rsa == NULL))
2424                                         {
2425                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2426                                         goto err;
2427                                         }
2428                                 rsa=pkey->pkey.rsa;
2429                                 EVP_PKEY_free(pkey);
2430                                 }
2431                                 
2432                         tmp_buf[0]=s->client_version>>8;
2433                         tmp_buf[1]=s->client_version&0xff;
2434                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2435                                         goto err;
2436
2437                         s->session->master_key_length=sizeof tmp_buf;
2438
2439                         q=p;
2440                         /* Fix buf for TLS and beyond */
2441                         if (s->version > SSL3_VERSION)
2442                                 p+=2;
2443                         n=RSA_public_encrypt(sizeof tmp_buf,
2444                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2445 #ifdef PKCS1_CHECK
2446                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2447                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2448 #endif
2449                         if (n <= 0)
2450                                 {
2451                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2452                                 goto err;
2453                                 }
2454
2455                         /* Fix buf for TLS and beyond */
2456                         if (s->version > SSL3_VERSION)
2457                                 {
2458                                 s2n(n,q);
2459                                 n+=2;
2460                                 }
2461
2462                         s->session->master_key_length=
2463                                 s->method->ssl3_enc->generate_master_secret(s,
2464                                         s->session->master_key,
2465                                         tmp_buf,sizeof tmp_buf);
2466                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2467                         }
2468 #endif
2469 #ifndef OPENSSL_NO_KRB5
2470                 else if (alg_k & SSL_kKRB5)
2471                         {
2472                         krb5_error_code krb5rc;
2473                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2474                         /*  krb5_data   krb5_ap_req;  */
2475                         krb5_data       *enc_ticket;
2476                         krb5_data       authenticator, *authp = NULL;
2477                         EVP_CIPHER_CTX  ciph_ctx;
2478                         const EVP_CIPHER *enc = NULL;
2479                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2480                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2481                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
2482                                                 + EVP_MAX_IV_LENGTH];
2483                         int             padl, outl = sizeof(epms);
2484
2485                         EVP_CIPHER_CTX_init(&ciph_ctx);
2486
2487 #ifdef KSSL_DEBUG
2488                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2489                                 alg_k, SSL_kKRB5);
2490 #endif  /* KSSL_DEBUG */
2491
2492                         authp = NULL;
2493 #ifdef KRB5SENDAUTH
2494                         if (KRB5SENDAUTH)  authp = &authenticator;
2495 #endif  /* KRB5SENDAUTH */
2496
2497                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2498                                 &kssl_err);
2499                         enc = kssl_map_enc(kssl_ctx->enctype);
2500                         if (enc == NULL)
2501                             goto err;
2502 #ifdef KSSL_DEBUG
2503                         {
2504                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2505                         if (krb5rc && kssl_err.text)
2506                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2507                         }
2508 #endif  /* KSSL_DEBUG */
2509
2510                         if (krb5rc)
2511                                 {
2512                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2513                                                 SSL_AD_HANDSHAKE_FAILURE);
2514                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2515                                                 kssl_err.reason);
2516                                 goto err;
2517                                 }
2518
2519                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2520                         **  in place of RFC 2712 KerberosWrapper, as in:
2521                         **
2522                         **  Send ticket (copy to *p, set n = length)
2523                         **  n = krb5_ap_req.length;
2524                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2525                         **  if (krb5_ap_req.data)  
2526                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2527                         **
2528                         **  Now using real RFC 2712 KerberosWrapper
2529                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2530                         **  Note: 2712 "opaque" types are here replaced
2531                         **  with a 2-byte length followed by the value.
2532                         **  Example:
2533                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2534                         **  Where "xx xx" = length bytes.  Shown here with
2535                         **  optional authenticator omitted.
2536                         */
2537
2538                         /*  KerberosWrapper.Ticket              */
2539                         s2n(enc_ticket->length,p);
2540                         memcpy(p, enc_ticket->data, enc_ticket->length);
2541                         p+= enc_ticket->length;
2542                         n = enc_ticket->length + 2;
2543
2544                         /*  KerberosWrapper.Authenticator       */
2545                         if (authp  &&  authp->length)  
2546                                 {
2547                                 s2n(authp->length,p);
2548                                 memcpy(p, authp->data, authp->length);
2549                                 p+= authp->length;
2550                                 n+= authp->length + 2;
2551                                 
2552                                 free(authp->data);
2553                                 authp->data = NULL;
2554                                 authp->length = 0;
2555                                 }
2556                         else
2557                                 {
2558                                 s2n(0,p);/*  null authenticator length  */
2559                                 n+=2;
2560                                 }
2561  
2562                             tmp_buf[0]=s->client_version>>8;
2563                             tmp_buf[1]=s->client_version&0xff;
2564                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2565                                 goto err;
2566
2567                         /*  20010420 VRS.  Tried it this way; failed.
2568                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2569                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2570                         **                              kssl_ctx->length);
2571                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2572                         */
2573
2574                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2575                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2576                                 kssl_ctx->key,iv);
2577                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2578                                 sizeof tmp_buf);
2579                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2580                         outl += padl;
2581                         if (outl > (int)sizeof epms)
2582                                 {
2583                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2584                                 goto err;
2585                                 }
2586                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2587
2588                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2589                         s2n(outl,p);
2590                         memcpy(p, epms, outl);
2591                         p+=outl;
2592                         n+=outl + 2;
2593
2594                         s->session->master_key_length=
2595                                 s->method->ssl3_enc->generate_master_secret(s,
2596                                         s->session->master_key,
2597                                         tmp_buf, sizeof tmp_buf);
2598
2599                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2600                         OPENSSL_cleanse(epms, outl);
2601                         }
2602 #endif
2603 #ifndef OPENSSL_NO_DH
2604                 else if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
2605                         {
2606                         DH *dh_srvr,*dh_clnt;
2607                         SESS_CERT *scert = s->session->sess_cert;
2608
2609                         if (scert == NULL) 
2610                                 {
2611                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2612                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2613                                 goto err;
2614                                 }
2615
2616                         if (scert->peer_dh_tmp != NULL)
2617                                 dh_srvr=scert->peer_dh_tmp;
2618                         else
2619                                 {
2620                                 /* we get them from the cert */
2621                                 int idx = scert->peer_cert_type;
2622                                 EVP_PKEY *spkey = NULL;
2623                                 dh_srvr = NULL;
2624                                 if (idx >= 0)
2625                                         spkey = X509_get_pubkey(
2626                                                 scert->peer_pkeys[idx].x509);
2627                                 if (spkey)
2628                                         {
2629                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2630                                         EVP_PKEY_free(spkey);
2631                                         }
2632                                 if (dh_srvr == NULL)
2633                                         {
2634                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2635                                             ERR_R_INTERNAL_ERROR);
2636                                         goto err;
2637                                         }
2638                                 }
2639                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2640                                 {
2641                                 /* Use client certificate key */
2642                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2643                                 dh_clnt = NULL;
2644                                 if (clkey)
2645                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2646                                 if (dh_clnt == NULL)
2647                                         {
2648                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2649                                             ERR_R_INTERNAL_ERROR);
2650                                         goto err;
2651                                         }
2652                                 }
2653                         else
2654                                 {
2655                                 /* generate a new random key */
2656                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2657                                         {
2658                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2659                                         goto err;
2660                                         }
2661                                 if (!DH_generate_key(dh_clnt))
2662                                         {
2663                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2664                                         DH_free(dh_clnt);
2665                                         goto err;
2666                                         }
2667                                 }
2668
2669                         /* use the 'p' output buffer for the DH key, but
2670                          * make sure to clear it out afterwards */
2671
2672                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2673                         if (scert->peer_dh_tmp == NULL)
2674                                 DH_free(dh_srvr);
2675
2676                         if (n <= 0)
2677                                 {
2678                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2679                                 DH_free(dh_clnt);
2680                                 goto err;
2681                                 }
2682
2683                         /* generate master key from the result */
2684                         s->session->master_key_length=
2685                                 s->method->ssl3_enc->generate_master_secret(s,
2686                                         s->session->master_key,p,n);
2687                         /* clean up */
2688                         memset(p,0,n);
2689
2690                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2691                                 n = 0;
2692                         else
2693                                 {
2694                                 /* send off the data */
2695                                 n=BN_num_bytes(dh_clnt->pub_key);
2696                                 s2n(n,p);
2697                                 BN_bn2bin(dh_clnt->pub_key,p);
2698                                 n+=2;
2699                                 }
2700
2701                         DH_free(dh_clnt);
2702
2703                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2704                         }
2705 #endif
2706
2707 #ifndef OPENSSL_NO_ECDH 
2708                 else if (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe))
2709                         {
2710                         const EC_GROUP *srvr_group = NULL;
2711                         EC_KEY *tkey;
2712                         int ecdh_clnt_cert = 0;
2713                         int field_size = 0;
2714
2715                         /* Did we send out the client's
2716                          * ECDH share for use in premaster
2717                          * computation as part of client certificate?
2718                          * If so, set ecdh_clnt_cert to 1.
2719                          */
2720                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
2721                                 {
2722                                 /* XXX: For now, we do not support client
2723                                  * authentication using ECDH certificates.
2724                                  * To add such support, one needs to add
2725                                  * code that checks for appropriate 
2726                                  * conditions and sets ecdh_clnt_cert to 1.
2727                                  * For example, the cert have an ECC
2728                                  * key on the same curve as the server's
2729                                  * and the key should be authorized for
2730                                  * key agreement.
2731                                  *
2732                                  * One also needs to add code in ssl3_connect
2733                                  * to skip sending the certificate verify
2734                                  * message.
2735                                  *
2736                                  * if ((s->cert->key->privatekey != NULL) &&
2737                                  *     (s->cert->key->privatekey->type ==
2738                                  *      EVP_PKEY_EC) && ...)
2739                                  * ecdh_clnt_cert = 1;
2740                                  */
2741                                 }
2742
2743                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2744                                 {
2745                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2746                                 }
2747                         else
2748                                 {
2749                                 /* Get the Server Public Key from Cert */
2750                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2751                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2752                                 if ((srvr_pub_pkey == NULL) ||
2753                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2754                                     (srvr_pub_pkey->pkey.ec == NULL))
2755                                         {
2756                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2757                                             ERR_R_INTERNAL_ERROR);
2758                                         goto err;
2759                                         }
2760
2761                                 tkey = srvr_pub_pkey->pkey.ec;
2762                                 }
2763
2764                         srvr_group   = EC_KEY_get0_group(tkey);
2765                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2766
2767                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2768                                 {
2769                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2770                                     ERR_R_INTERNAL_ERROR);
2771                                 goto err;
2772                                 }
2773
2774                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
2775                                 {
2776                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2777                                 goto err;
2778                                 }
2779
2780                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2781                                 {
2782                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2783                                 goto err;
2784                                 }
2785                         if (ecdh_clnt_cert) 
2786                                 { 
2787                                 /* Reuse key info from our certificate
2788                                  * We only need our private key to perform
2789                                  * the ECDH computation.
2790                                  */
2791                                 const BIGNUM *priv_key;
2792                                 tkey = s->cert->key->privatekey->pkey.ec;
2793                                 priv_key = EC_KEY_get0_private_key(tkey);
2794                                 if (priv_key == NULL)
2795                                         {
2796                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2797                                         goto err;
2798                                         }
2799                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2800                                         {
2801                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2802                                         goto err;
2803                                         }
2804                                 }
2805                         else 
2806                                 {
2807                                 /* Generate a new ECDH key pair */
2808                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2809                                         {
2810                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2811                                         goto err;
2812                                         }
2813                                 }
2814
2815                         /* use the 'p' output buffer for the ECDH key, but
2816                          * make sure to clear it out afterwards
2817                          */
2818
2819                         field_size = EC_GROUP_get_degree(srvr_group);
2820                         if (field_size <= 0)
2821                                 {
2822                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2823                                        ERR_R_ECDH_LIB);
2824                                 goto err;
2825                                 }
2826                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2827                         if (n <= 0)
2828                                 {
2829                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2830                                        ERR_R_ECDH_LIB);
2831                                 goto err;
2832                                 }
2833
2834                         /* generate master key from the result */
2835                         s->session->master_key_length = s->method->ssl3_enc \
2836                             -> generate_master_secret(s, 
2837                                 s->session->master_key,
2838                                 p, n);
2839
2840                         memset(p, 0, n); /* clean up */
2841
2842                         if (ecdh_clnt_cert) 
2843                                 {
2844                                 /* Send empty client key exch message */
2845                                 n = 0;
2846                                 }
2847                         else 
2848                                 {
2849                                 /* First check the size of encoding and
2850                                  * allocate memory accordingly.
2851                                  */
2852                                 encoded_pt_len = 
2853                                     EC_POINT_point2oct(srvr_group, 
2854                                         EC_KEY_get0_public_key(clnt_ecdh), 
2855                                         POINT_CONVERSION_UNCOMPRESSED, 
2856                                         NULL, 0, NULL);
2857
2858                                 encodedPoint = (unsigned char *) 
2859                                     OPENSSL_malloc(encoded_pt_len * 
2860                                         sizeof(unsigned char)); 
2861                                 bn_ctx = BN_CTX_new();
2862                                 if ((encodedPoint == NULL) || 
2863                                     (bn_ctx == NULL)) 
2864                                         {
2865                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2866                                         goto err;
2867                                         }
2868
2869                                 /* Encode the public key */
2870                                 n = EC_POINT_point2oct(srvr_group, 
2871                                     EC_KEY_get0_public_key(clnt_ecdh), 
2872                                     POINT_CONVERSION_UNCOMPRESSED, 
2873                                     encodedPoint, encoded_pt_len, bn_ctx);
2874
2875                                 *p = n; /* length of encoded point */
2876                                 /* Encoded point will be copied here */
2877                                 p += 1; 
2878                                 /* copy the point */
2879                                 memcpy((unsigned char *)p, encodedPoint, n);
2880                                 /* increment n to account for length field */
2881                                 n += 1; 
2882                                 }
2883
2884                         /* Free allocated memory */
2885                         BN_CTX_free(bn_ctx);
2886                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2887                         if (clnt_ecdh != NULL) 
2888                                  EC_KEY_free(clnt_ecdh);
2889                         EVP_PKEY_free(srvr_pub_pkey);
2890                         }
2891 #endif /* !OPENSSL_NO_ECDH */
2892                 else if (alg_k & SSL_kGOST) 
2893                         {
2894                         /* GOST key exchange message creation */
2895                         EVP_PKEY_CTX *pkey_ctx;
2896                         X509 *peer_cert; 
2897                         size_t msglen;
2898                         unsigned int md_len;
2899                         int keytype;
2900                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2901                         EVP_MD_CTX *ukm_hash;
2902                         EVP_PKEY *pub_key;
2903
2904                         /* Get server sertificate PKEY and create ctx from it */
2905                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2906                         if (!peer_cert) 
2907                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2908                         if (!peer_cert)         {
2909                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2910                                         goto err;
2911                                 }       
2912                                 
2913                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2914                         /* If we have send a certificate, and certificate key
2915
2916                          * parameters match those of server certificate, use
2917                          * certificate key for key exchange
2918                          */
2919
2920                          /* Otherwise, generate ephemeral key pair */
2921                                         
2922                         EVP_PKEY_encrypt_init(pkey_ctx);
2923                           /* Generate session key */    
2924                     RAND_bytes(premaster_secret,32);
2925                         /* If we have client certificate, use its secret as peer key */
2926                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2927                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2928                                         /* If there was an error - just ignore it. Ephemeral key
2929                                         * would be used
2930                                         */
2931                                         ERR_clear_error();
2932                                 }
2933                         }                       
2934                         /* Compute shared IV and store it in algorithm-specific
2935                          * context data */
2936                         ukm_hash = EVP_MD_CTX_create();
2937                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2938                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2939                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2940                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2941                         EVP_MD_CTX_destroy(ukm_hash);
2942                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2943                                 8,shared_ukm)<0) {
2944                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2945                                                 SSL_R_LIBRARY_BUG);
2946                                         goto err;
2947                                 }       
2948                         /* Make GOST keytransport blob message */
2949                         /*Encapsulate it into sequence */
2950                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2951                         msglen=255;
2952                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2953                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2954                                         SSL_R_LIBRARY_BUG);
2955                                 goto err;
2956                         }
2957                         if (msglen >= 0x80)
2958                                 {
2959                                 *(p++)=0x81;
2960                                 *(p++)= msglen & 0xff;
2961                                 n=msglen+3;
2962                                 }
2963                         else
2964                                 {
2965                                 *(p++)= msglen & 0xff;
2966                                 n=msglen+2;
2967                                 }
2968                         memcpy(p, tmp, msglen);
2969                         /* Check if pubkey from client certificate was used */
2970                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2971                                 {
2972                                 /* Set flag "skip certificate verify" */
2973                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2974                                 }
2975                         EVP_PKEY_CTX_free(pkey_ctx);
2976                         s->session->master_key_length=
2977                                 s->method->ssl3_enc->generate_master_secret(s,
2978                                         s->session->master_key,premaster_secret,32);
2979                         EVP_PKEY_free(pub_key);
2980
2981                         }
2982 #ifndef OPENSSL_NO_SRP
2983                 else if (alg_k & SSL_kSRP)
2984                         {
2985                         if (s->srp_ctx.A != NULL)
2986                                 {
2987                                 /* send off the data */
2988                                 n=BN_num_bytes(s->srp_ctx.A);
2989                                 s2n(n,p);
2990                                 BN_bn2bin(s->srp_ctx.A,p);
2991                                 n+=2;
2992                                 }
2993                         else
2994                                 {
2995                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2996                                 goto err;
2997                                 }
2998                         if (s->session->srp_username != NULL)
2999                                 OPENSSL_free(s->session->srp_username);
3000                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3001                         if (s->session->srp_username == NULL)
3002                                 {
3003                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3004                                         ERR_R_MALLOC_FAILURE);
3005                                 goto err;
3006                                 }
3007
3008                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3009                                 {
3010                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3011                                 goto err;
3012                                 }
3013                         }
3014 #endif
3015 #ifndef OPENSSL_NO_PSK
3016                 else if (alg_k & SSL_kPSK)
3017                         {
3018                         char identity[PSK_MAX_IDENTITY_LEN];
3019                         unsigned char *t = NULL;
3020                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3021                         unsigned int pre_ms_len = 0, psk_len = 0;