New option no-ssl3-method which removes SSLv3_*method
[openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #include <stdio.h>
152 #include "ssl_locl.h"
153 #include "kssl_lcl.h"
154 #include <openssl/buffer.h>
155 #include <openssl/rand.h>
156 #include <openssl/objects.h>
157 #include <openssl/evp.h>
158 #include <openssl/md5.h>
159 #ifdef OPENSSL_FIPS
160 #include <openssl/fips.h>
161 #endif
162 #ifndef OPENSSL_NO_DH
163 #include <openssl/dh.h>
164 #endif
165 #include <openssl/bn.h>
166 #ifndef OPENSSL_NO_ENGINE
167 #include <openssl/engine.h>
168 #endif
169
170 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
171
172 #ifndef OPENSSL_NO_SSL3_METHOD
173 static const SSL_METHOD *ssl3_get_client_method(int ver)
174         {
175         if (ver == SSL3_VERSION)
176                 return(SSLv3_client_method());
177         else
178                 return(NULL);
179         }
180
181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
182                         ssl_undefined_function,
183                         ssl3_connect,
184                         ssl3_get_client_method)
185 #endif
186
187 int ssl3_connect(SSL *s)
188         {
189         BUF_MEM *buf=NULL;
190         unsigned long Time=(unsigned long)time(NULL);
191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
192         int ret= -1;
193         int new_state,state,skip=0;
194
195         RAND_add(&Time,sizeof(Time),0);
196         ERR_clear_error();
197         clear_sys_error();
198
199         if (s->info_callback != NULL)
200                 cb=s->info_callback;
201         else if (s->ctx->info_callback != NULL)
202                 cb=s->ctx->info_callback;
203         
204         s->in_handshake++;
205         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
206
207 #ifndef OPENSSL_NO_HEARTBEATS
208         /* If we're awaiting a HeartbeatResponse, pretend we
209          * already got and don't await it anymore, because
210          * Heartbeats don't make sense during handshakes anyway.
211          */
212         if (s->tlsext_hb_pending)
213                 {
214                 s->tlsext_hb_pending = 0;
215                 s->tlsext_hb_seq++;
216                 }
217 #endif
218
219         for (;;)
220                 {
221                 state=s->state;
222
223                 switch(s->state)
224                         {
225                 case SSL_ST_RENEGOTIATE:
226                         s->renegotiate=1;
227                         s->state=SSL_ST_CONNECT;
228                         s->ctx->stats.sess_connect_renegotiate++;
229 #ifndef OPENSSL_NO_TLSEXT
230                         /*
231                          * If renegotiating, the server may choose to not issue
232                          * a new ticket, so reset the flag. It will be set to
233                          * the right value when parsing ServerHello extensions.
234                          */
235                         s->tlsext_ticket_expected = 0;
236 #endif
237                         /* break */
238                 case SSL_ST_BEFORE:
239                 case SSL_ST_CONNECT:
240                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
241                 case SSL_ST_OK|SSL_ST_CONNECT:
242
243                         s->server=0;
244                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
245
246                         if ((s->version & 0xff00 ) != 0x0300)
247                                 {
248                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
249                                 ret = -1;
250                                 goto end;
251                                 }
252                                 
253                         /* s->version=SSL3_VERSION; */
254                         s->type=SSL_ST_CONNECT;
255
256                         if (s->init_buf == NULL)
257                                 {
258                                 if ((buf=BUF_MEM_new()) == NULL)
259                                         {
260                                         ret= -1;
261                                         goto end;
262                                         }
263                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
264                                         {
265                                         ret= -1;
266                                         goto end;
267                                         }
268                                 s->init_buf=buf;
269                                 buf=NULL;
270                                 }
271
272                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
273
274                         /* setup buffing BIO */
275                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
276
277                         /* don't push the buffering BIO quite yet */
278
279                         ssl3_init_finished_mac(s);
280
281                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
282                         s->ctx->stats.sess_connect++;
283                         s->init_num=0;
284                         break;
285
286                 case SSL3_ST_CW_CLNT_HELLO_A:
287                 case SSL3_ST_CW_CLNT_HELLO_B:
288
289                         s->shutdown=0;
290                         ret=ssl3_client_hello(s);
291                         if (ret <= 0) goto end;
292                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
293                         s->init_num=0;
294
295                         /* turn on buffering for the next lot of output */
296                         if (s->bbio != s->wbio)
297                                 s->wbio=BIO_push(s->bbio,s->wbio);
298
299                         break;
300
301                 case SSL3_ST_CR_SRVR_HELLO_A:
302                 case SSL3_ST_CR_SRVR_HELLO_B:
303                         ret=ssl3_get_server_hello(s);
304                         if (ret <= 0) goto end;
305
306                         if (s->hit)
307                                 {
308                                 s->state=SSL3_ST_CR_FINISHED_A;
309 #ifndef OPENSSL_NO_TLSEXT
310                                 if (s->tlsext_ticket_expected)
311                                         {
312                                         /* receive renewed session ticket */
313                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
314                                         }
315 #endif
316                                 }
317                         else
318                                 s->state=SSL3_ST_CR_CERT_A;
319                         s->init_num=0;
320                         break;
321
322                 case SSL3_ST_CR_CERT_A:
323                 case SSL3_ST_CR_CERT_B:
324 #ifndef OPENSSL_NO_TLSEXT
325                         ret=ssl3_check_finished(s);
326                         if (ret <= 0) goto end;
327                         if (ret == 2)
328                                 {
329                                 s->hit = 1;
330                                 if (s->tlsext_ticket_expected)
331                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
332                                 else
333                                         s->state=SSL3_ST_CR_FINISHED_A;
334                                 s->init_num=0;
335                                 break;
336                                 }
337 #endif
338                         /* Check if it is anon DH/ECDH, SRP auth */
339                         /* or PSK */
340                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) &&
341                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
342                                 {
343                                 ret=ssl3_get_server_certificate(s);
344                                 if (ret <= 0) goto end;
345 #ifndef OPENSSL_NO_TLSEXT
346                                 if (s->tlsext_status_expected)
347                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
348                                 else
349                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
350                                 }
351                         else
352                                 {
353                                 skip = 1;
354                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
355                                 }
356 #else
357                                 }
358                         else
359                                 skip=1;
360
361                         s->state=SSL3_ST_CR_KEY_EXCH_A;
362 #endif
363                         s->init_num=0;
364                         break;
365
366                 case SSL3_ST_CR_KEY_EXCH_A:
367                 case SSL3_ST_CR_KEY_EXCH_B:
368                         ret=ssl3_get_key_exchange(s);
369                         if (ret <= 0) goto end;
370                         s->state=SSL3_ST_CR_CERT_REQ_A;
371                         s->init_num=0;
372
373                         /* at this point we check that we have the
374                          * required stuff from the server */
375                         if (!ssl3_check_cert_and_algorithm(s))
376                                 {
377                                 ret= -1;
378                                 goto end;
379                                 }
380                         break;
381
382                 case SSL3_ST_CR_CERT_REQ_A:
383                 case SSL3_ST_CR_CERT_REQ_B:
384                         ret=ssl3_get_certificate_request(s);
385                         if (ret <= 0) goto end;
386                         s->state=SSL3_ST_CR_SRVR_DONE_A;
387                         s->init_num=0;
388                         break;
389
390                 case SSL3_ST_CR_SRVR_DONE_A:
391                 case SSL3_ST_CR_SRVR_DONE_B:
392                         ret=ssl3_get_server_done(s);
393                         if (ret <= 0) goto end;
394 #ifndef OPENSSL_NO_SRP
395                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
396                                 {
397                                 if ((ret = SRP_Calc_A_param(s))<=0)
398                                         {
399                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
400                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
401                                         goto end;
402                                         }
403                                 }
404 #endif
405                         if (s->s3->tmp.cert_req)
406                                 s->state=SSL3_ST_CW_CERT_A;
407                         else
408                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
409                         s->init_num=0;
410
411                         break;
412
413                 case SSL3_ST_CW_CERT_A:
414                 case SSL3_ST_CW_CERT_B:
415                 case SSL3_ST_CW_CERT_C:
416                 case SSL3_ST_CW_CERT_D:
417                         ret=ssl3_send_client_certificate(s);
418                         if (ret <= 0) goto end;
419                         s->state=SSL3_ST_CW_KEY_EXCH_A;
420                         s->init_num=0;
421                         break;
422
423                 case SSL3_ST_CW_KEY_EXCH_A:
424                 case SSL3_ST_CW_KEY_EXCH_B:
425                         ret=ssl3_send_client_key_exchange(s);
426                         if (ret <= 0) goto end;
427                         /* EAY EAY EAY need to check for DH fix cert
428                          * sent back */
429                         /* For TLS, cert_req is set to 2, so a cert chain
430                          * of nothing is sent, but no verify packet is sent */
431                         /* XXX: For now, we do not support client 
432                          * authentication in ECDH cipher suites with
433                          * ECDH (rather than ECDSA) certificates.
434                          * We need to skip the certificate verify 
435                          * message when client's ECDH public key is sent 
436                          * inside the client certificate.
437                          */
438                         if (s->s3->tmp.cert_req == 1)
439                                 {
440                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
441                                 }
442                         else
443                                 {
444                                 s->state=SSL3_ST_CW_CHANGE_A;
445                                 s->s3->change_cipher_spec=0;
446                                 }
447                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
448                                 {
449                                 s->state=SSL3_ST_CW_CHANGE_A;
450                                 s->s3->change_cipher_spec=0;
451                                 }
452
453                         s->init_num=0;
454                         break;
455
456                 case SSL3_ST_CW_CERT_VRFY_A:
457                 case SSL3_ST_CW_CERT_VRFY_B:
458                         ret=ssl3_send_client_verify(s);
459                         if (ret <= 0) goto end;
460                         s->state=SSL3_ST_CW_CHANGE_A;
461                         s->init_num=0;
462                         s->s3->change_cipher_spec=0;
463                         break;
464
465                 case SSL3_ST_CW_CHANGE_A:
466                 case SSL3_ST_CW_CHANGE_B:
467                         ret=ssl3_send_change_cipher_spec(s,
468                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
469                         if (ret <= 0) goto end;
470
471 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
472                         s->state=SSL3_ST_CW_FINISHED_A;
473 #else
474                         if (s->s3->next_proto_neg_seen)
475                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
476                         else
477                                 s->state=SSL3_ST_CW_FINISHED_A;
478 #endif
479                         s->init_num=0;
480
481                         s->session->cipher=s->s3->tmp.new_cipher;
482 #ifdef OPENSSL_NO_COMP
483                         s->session->compress_meth=0;
484 #else
485                         if (s->s3->tmp.new_compression == NULL)
486                                 s->session->compress_meth=0;
487                         else
488                                 s->session->compress_meth=
489                                         s->s3->tmp.new_compression->id;
490 #endif
491                         if (!s->method->ssl3_enc->setup_key_block(s))
492                                 {
493                                 ret= -1;
494                                 goto end;
495                                 }
496
497                         if (!s->method->ssl3_enc->change_cipher_state(s,
498                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
499                                 {
500                                 ret= -1;
501                                 goto end;
502                                 }
503
504                         break;
505
506 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
507                 case SSL3_ST_CW_NEXT_PROTO_A:
508                 case SSL3_ST_CW_NEXT_PROTO_B:
509                         ret=ssl3_send_next_proto(s);
510                         if (ret <= 0) goto end;
511                         s->state=SSL3_ST_CW_FINISHED_A;
512                         break;
513 #endif
514
515                 case SSL3_ST_CW_FINISHED_A:
516                 case SSL3_ST_CW_FINISHED_B:
517                         ret=ssl3_send_finished(s,
518                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
519                                 s->method->ssl3_enc->client_finished_label,
520                                 s->method->ssl3_enc->client_finished_label_len);
521                         if (ret <= 0) goto end;
522                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
523                         s->state=SSL3_ST_CW_FLUSH;
524
525                         /* clear flags */
526                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
527                         if (s->hit)
528                                 {
529                                 s->s3->tmp.next_state=SSL_ST_OK;
530                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
531                                         {
532                                         s->state=SSL_ST_OK;
533                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
534                                         s->s3->delay_buf_pop_ret=0;
535                                         }
536                                 }
537                         else
538                                 {
539 #ifndef OPENSSL_NO_TLSEXT
540                                 /* Allow NewSessionTicket if ticket expected */
541                                 if (s->tlsext_ticket_expected)
542                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
543                                 else
544 #endif
545                                 
546                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
547                                 }
548                         s->init_num=0;
549                         break;
550
551 #ifndef OPENSSL_NO_TLSEXT
552                 case SSL3_ST_CR_SESSION_TICKET_A:
553                 case SSL3_ST_CR_SESSION_TICKET_B:
554                         ret=ssl3_get_new_session_ticket(s);
555                         if (ret <= 0) goto end;
556                         s->state=SSL3_ST_CR_FINISHED_A;
557                         s->init_num=0;
558                 break;
559
560                 case SSL3_ST_CR_CERT_STATUS_A:
561                 case SSL3_ST_CR_CERT_STATUS_B:
562                         ret=ssl3_get_cert_status(s);
563                         if (ret <= 0) goto end;
564                         s->state=SSL3_ST_CR_KEY_EXCH_A;
565                         s->init_num=0;
566                 break;
567 #endif
568
569                 case SSL3_ST_CR_FINISHED_A:
570                 case SSL3_ST_CR_FINISHED_B:
571
572                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
573                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
574                                 SSL3_ST_CR_FINISHED_B);
575                         if (ret <= 0) goto end;
576
577                         if (s->hit)
578                                 s->state=SSL3_ST_CW_CHANGE_A;
579                         else
580                                 s->state=SSL_ST_OK;
581                         s->init_num=0;
582                         break;
583
584                 case SSL3_ST_CW_FLUSH:
585                         s->rwstate=SSL_WRITING;
586                         if (BIO_flush(s->wbio) <= 0)
587                                 {
588                                 ret= -1;
589                                 goto end;
590                                 }
591                         s->rwstate=SSL_NOTHING;
592                         s->state=s->s3->tmp.next_state;
593                         break;
594
595                 case SSL_ST_OK:
596                         /* clean a few things up */
597                         ssl3_cleanup_key_block(s);
598
599                         if (s->init_buf != NULL)
600                                 {
601                                 BUF_MEM_free(s->init_buf);
602                                 s->init_buf=NULL;
603                                 }
604
605                         /* If we are not 'joining' the last two packets,
606                          * remove the buffering now */
607                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
608                                 ssl_free_wbio_buffer(s);
609                         /* else do it later in ssl3_write */
610
611                         s->init_num=0;
612                         s->renegotiate=0;
613                         s->new_session=0;
614
615                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
616                         if (s->hit) s->ctx->stats.sess_hit++;
617
618                         ret=1;
619                         /* s->server=0; */
620                         s->handshake_func=ssl3_connect;
621                         s->ctx->stats.sess_connect_good++;
622
623                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
624
625                         goto end;
626                         /* break; */
627                         
628                 default:
629                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
630                         ret= -1;
631                         goto end;
632                         /* break; */
633                         }
634
635                 /* did we do anything */
636                 if (!s->s3->tmp.reuse_message && !skip)
637                         {
638                         if (s->debug)
639                                 {
640                                 if ((ret=BIO_flush(s->wbio)) <= 0)
641                                         goto end;
642                                 }
643
644                         if ((cb != NULL) && (s->state != state))
645                                 {
646                                 new_state=s->state;
647                                 s->state=state;
648                                 cb(s,SSL_CB_CONNECT_LOOP,1);
649                                 s->state=new_state;
650                                 }
651                         }
652                 skip=0;
653                 }
654 end:
655         s->in_handshake--;
656         if (buf != NULL)
657                 BUF_MEM_free(buf);
658         if (cb != NULL)
659                 cb(s,SSL_CB_CONNECT_EXIT,ret);
660         return(ret);
661         }
662
663
664 int ssl3_client_hello(SSL *s)
665         {
666         unsigned char *buf;
667         unsigned char *p,*d;
668         int i;
669         unsigned long l;
670 #ifndef OPENSSL_NO_COMP
671         int j;
672         SSL_COMP *comp;
673 #endif
674
675         buf=(unsigned char *)s->init_buf->data;
676         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
677                 {
678                 SSL_SESSION *sess = s->session;
679                 if ((sess == NULL) ||
680                         (sess->ssl_version != s->version) ||
681 #ifdef OPENSSL_NO_TLSEXT
682                         !sess->session_id_length ||
683 #else
684                         (!sess->session_id_length && !sess->tlsext_tick) ||
685 #endif
686                         (sess->not_resumable))
687                         {
688                         if (!ssl_get_new_session(s,0))
689                                 goto err;
690                         }
691                 /* else use the pre-loaded session */
692
693                 p=s->s3->client_random;
694
695                 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
696                         goto err;
697
698                 /* Do the message type and length last */
699                 d=p= &(buf[4]);
700
701                 /* version indicates the negotiated version: for example from
702                  * an SSLv2/v3 compatible client hello). The client_version
703                  * field is the maximum version we permit and it is also
704                  * used in RSA encrypted premaster secrets. Some servers can
705                  * choke if we initially report a higher version then
706                  * renegotiate to a lower one in the premaster secret. This
707                  * didn't happen with TLS 1.0 as most servers supported it
708                  * but it can with TLS 1.1 or later if the server only supports
709                  * 1.0.
710                  *
711                  * Possible scenario with previous logic:
712                  *      1. Client hello indicates TLS 1.2
713                  *      2. Server hello says TLS 1.0
714                  *      3. RSA encrypted premaster secret uses 1.2.
715                  *      4. Handhaked proceeds using TLS 1.0.
716                  *      5. Server sends hello request to renegotiate.
717                  *      6. Client hello indicates TLS v1.0 as we now
718                  *         know that is maximum server supports.
719                  *      7. Server chokes on RSA encrypted premaster secret
720                  *         containing version 1.0.
721                  *
722                  * For interoperability it should be OK to always use the
723                  * maximum version we support in client hello and then rely
724                  * on the checking of version to ensure the servers isn't
725                  * being inconsistent: for example initially negotiating with
726                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
727                  * client_version in client hello and not resetting it to
728                  * the negotiated version.
729                  */
730 #if 0
731                 *(p++)=s->version>>8;
732                 *(p++)=s->version&0xff;
733                 s->client_version=s->version;
734 #else
735                 *(p++)=s->client_version>>8;
736                 *(p++)=s->client_version&0xff;
737 #endif
738
739                 /* Random stuff */
740                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
741                 p+=SSL3_RANDOM_SIZE;
742
743                 /* Session ID */
744                 if (s->new_session)
745                         i=0;
746                 else
747                         i=s->session->session_id_length;
748                 *(p++)=i;
749                 if (i != 0)
750                         {
751                         if (i > (int)sizeof(s->session->session_id))
752                                 {
753                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
754                                 goto err;
755                                 }
756                         memcpy(p,s->session->session_id,i);
757                         p+=i;
758                         }
759                 
760                 /* Ciphers supported */
761                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
762                 if (i == 0)
763                         {
764                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
765                         goto err;
766                         }
767 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
768                         /* Some servers hang if client hello > 256 bytes
769                          * as hack workaround chop number of supported ciphers
770                          * to keep it well below this if we use TLS v1.2
771                          */
772                         if (TLS1_get_version(s) >= TLS1_2_VERSION
773                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
774                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
775 #endif
776                 s2n(i,p);
777                 p+=i;
778
779                 /* COMPRESSION */
780 #ifdef OPENSSL_NO_COMP
781                 *(p++)=1;
782 #else
783
784                 if ((s->options & SSL_OP_NO_COMPRESSION)
785                                         || !s->ctx->comp_methods)
786                         j=0;
787                 else
788                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
789                 *(p++)=1+j;
790                 for (i=0; i<j; i++)
791                         {
792                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
793                         *(p++)=comp->id;
794                         }
795 #endif
796                 *(p++)=0; /* Add the NULL method */
797
798 #ifndef OPENSSL_NO_TLSEXT
799                 /* TLS extensions*/
800                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
801                         {
802                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
803                         goto err;
804                         }
805                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
806                         {
807                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
808                         goto err;
809                         }
810 #endif
811                 
812                 l=(p-d);
813                 d=buf;
814                 *(d++)=SSL3_MT_CLIENT_HELLO;
815                 l2n3(l,d);
816
817                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
818                 /* number of bytes to write */
819                 s->init_num=p-buf;
820                 s->init_off=0;
821                 }
822
823         /* SSL3_ST_CW_CLNT_HELLO_B */
824         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
825 err:
826         return(-1);
827         }
828
829 int ssl3_get_server_hello(SSL *s)
830         {
831         STACK_OF(SSL_CIPHER) *sk;
832         const SSL_CIPHER *c;
833         unsigned char *p,*d;
834         int i,al,ok;
835         unsigned int j;
836         long n;
837 #ifndef OPENSSL_NO_COMP
838         SSL_COMP *comp;
839 #endif
840
841         n=s->method->ssl_get_message(s,
842                 SSL3_ST_CR_SRVR_HELLO_A,
843                 SSL3_ST_CR_SRVR_HELLO_B,
844                 -1,
845                 20000, /* ?? */
846                 &ok);
847
848         if (!ok) return((int)n);
849
850         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
851                 {
852                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
853                         {
854                         if ( s->d1->send_cookie == 0)
855                                 {
856                                 s->s3->tmp.reuse_message = 1;
857                                 return 1;
858                                 }
859                         else /* already sent a cookie */
860                                 {
861                                 al=SSL_AD_UNEXPECTED_MESSAGE;
862                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
863                                 goto f_err;
864                                 }
865                         }
866                 }
867         
868         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
869                 {
870                 al=SSL_AD_UNEXPECTED_MESSAGE;
871                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
872                 goto f_err;
873                 }
874
875         d=p=(unsigned char *)s->init_msg;
876
877         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
878                 {
879                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
880                 s->version=(s->version&0xff00)|p[1];
881                 al=SSL_AD_PROTOCOL_VERSION;
882                 goto f_err;
883                 }
884         p+=2;
885
886         /* load the server hello data */
887         /* load the server random */
888         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
889         p+=SSL3_RANDOM_SIZE;
890
891         /* get the session-id */
892         j= *(p++);
893
894         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
895                 {
896                 al=SSL_AD_ILLEGAL_PARAMETER;
897                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
898                 goto f_err;
899                 }
900
901 #ifndef OPENSSL_NO_TLSEXT
902         /* check if we want to resume the session based on external pre-shared secret */
903         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
904                 {
905                 SSL_CIPHER *pref_cipher=NULL;
906                 s->session->master_key_length=sizeof(s->session->master_key);
907                 if (s->tls_session_secret_cb(s, s->session->master_key,
908                                              &s->session->master_key_length,
909                                              NULL, &pref_cipher,
910                                              s->tls_session_secret_cb_arg))
911                         {
912                         s->session->cipher = pref_cipher ?
913                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
914                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
915                         }
916                 }
917 #endif /* OPENSSL_NO_TLSEXT */
918
919         if (j != 0 && j == s->session->session_id_length
920             && memcmp(p,s->session->session_id,j) == 0)
921             {
922             if(s->sid_ctx_length != s->session->sid_ctx_length
923                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
924                 {
925                 /* actually a client application bug */
926                 al=SSL_AD_ILLEGAL_PARAMETER;
927                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
928                 goto f_err;
929                 }
930             s->s3->flags |= SSL3_FLAGS_CCS_OK;
931             s->hit=1;
932             }
933         else    /* a miss or crap from the other end */
934                 {
935                 /* If we were trying for session-id reuse, make a new
936                  * SSL_SESSION so we don't stuff up other people */
937                 s->hit=0;
938                 if (s->session->session_id_length > 0)
939                         {
940                         if (!ssl_get_new_session(s,0))
941                                 {
942                                 al=SSL_AD_INTERNAL_ERROR;
943                                 goto f_err;
944                                 }
945                         }
946                 s->session->session_id_length=j;
947                 memcpy(s->session->session_id,p,j); /* j could be 0 */
948                 }
949         p+=j;
950         c=ssl_get_cipher_by_char(s,p);
951         if (c == NULL)
952                 {
953                 /* unknown cipher */
954                 al=SSL_AD_ILLEGAL_PARAMETER;
955                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
956                 goto f_err;
957                 }
958         /* TLS v1.2 only ciphersuites require v1.2 or later */
959         if ((c->algorithm_ssl & SSL_TLSV1_2) && 
960                 (TLS1_get_version(s) < TLS1_2_VERSION))
961                 {
962                 al=SSL_AD_ILLEGAL_PARAMETER;
963                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
964                 goto f_err;
965                 }
966 #ifndef OPENSSL_NO_SRP
967         if (((c->algorithm_mkey & SSL_kSRP) || (c->algorithm_auth & SSL_aSRP)) &&
968                     !(s->srp_ctx.srp_Mask & SSL_kSRP))
969                 {
970                 al=SSL_AD_ILLEGAL_PARAMETER;
971                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
972                 goto f_err;
973                 }
974 #endif /* OPENSSL_NO_SRP */
975         p+=ssl_put_cipher_by_char(s,NULL,NULL);
976
977         sk=ssl_get_ciphers_by_id(s);
978         i=sk_SSL_CIPHER_find(sk,c);
979         if (i < 0)
980                 {
981                 /* we did not say we would use this cipher */
982                 al=SSL_AD_ILLEGAL_PARAMETER;
983                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
984                 goto f_err;
985                 }
986
987         /* Depending on the session caching (internal/external), the cipher
988            and/or cipher_id values may not be set. Make sure that
989            cipher_id is set and use it for comparison. */
990         if (s->session->cipher)
991                 s->session->cipher_id = s->session->cipher->id;
992         if (s->hit && (s->session->cipher_id != c->id))
993                 {
994 /* Workaround is now obsolete */
995 #if 0
996                 if (!(s->options &
997                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
998 #endif
999                         {
1000                         al=SSL_AD_ILLEGAL_PARAMETER;
1001                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1002                         goto f_err;
1003                         }
1004                 }
1005         s->s3->tmp.new_cipher=c;
1006         /* Don't digest cached records if TLS v1.2: we may need them for
1007          * client authentication.
1008          */
1009         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
1010                 {
1011                 al = SSL_AD_INTERNAL_ERROR;
1012                 goto f_err;
1013                 }
1014         /* lets get the compression algorithm */
1015         /* COMPRESSION */
1016 #ifdef OPENSSL_NO_COMP
1017         if (*(p++) != 0)
1018                 {
1019                 al=SSL_AD_ILLEGAL_PARAMETER;
1020                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1021                 goto f_err;
1022                 }
1023         /* If compression is disabled we'd better not try to resume a session
1024          * using compression.
1025          */
1026         if (s->session->compress_meth != 0)
1027                 {
1028                 al=SSL_AD_INTERNAL_ERROR;
1029                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1030                 goto f_err;
1031                 }
1032 #else
1033         j= *(p++);
1034         if (s->hit && j != s->session->compress_meth)
1035                 {
1036                 al=SSL_AD_ILLEGAL_PARAMETER;
1037                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1038                 goto f_err;
1039                 }
1040         if (j == 0)
1041                 comp=NULL;
1042         else if (s->options & SSL_OP_NO_COMPRESSION)
1043                 {
1044                 al=SSL_AD_ILLEGAL_PARAMETER;
1045                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1046                 goto f_err;
1047                 }
1048         else
1049                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1050         
1051         if ((j != 0) && (comp == NULL))
1052                 {
1053                 al=SSL_AD_ILLEGAL_PARAMETER;
1054                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1055                 goto f_err;
1056                 }
1057         else
1058                 {
1059                 s->s3->tmp.new_compression=comp;
1060                 }
1061 #endif
1062
1063 #ifndef OPENSSL_NO_TLSEXT
1064         /* TLS extensions*/
1065         if (s->version >= SSL3_VERSION)
1066                 {
1067                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
1068                         {
1069                         /* 'al' set by ssl_parse_serverhello_tlsext */
1070                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1071                         goto f_err; 
1072                         }
1073                 if (ssl_check_serverhello_tlsext(s) <= 0)
1074                         {
1075                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1076                                 goto err;
1077                         }
1078                 }
1079 #endif
1080
1081         if (p != (d+n))
1082                 {
1083                 /* wrong packet length */
1084                 al=SSL_AD_DECODE_ERROR;
1085                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1086                 goto f_err;
1087                 }
1088
1089         return(1);
1090 f_err:
1091         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1092 err:
1093         return(-1);
1094         }
1095
1096 int ssl3_get_server_certificate(SSL *s)
1097         {
1098         int al,i,ok,ret= -1;
1099         unsigned long n,nc,llen,l;
1100         X509 *x=NULL;
1101         const unsigned char *q,*p;
1102         unsigned char *d;
1103         STACK_OF(X509) *sk=NULL;
1104         SESS_CERT *sc;
1105         EVP_PKEY *pkey=NULL;
1106         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1107
1108         n=s->method->ssl_get_message(s,
1109                 SSL3_ST_CR_CERT_A,
1110                 SSL3_ST_CR_CERT_B,
1111                 -1,
1112                 s->max_cert_list,
1113                 &ok);
1114
1115         if (!ok) return((int)n);
1116
1117         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1118                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 
1119                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1120                 {
1121                 s->s3->tmp.reuse_message=1;
1122                 return(1);
1123                 }
1124
1125         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1126                 {
1127                 al=SSL_AD_UNEXPECTED_MESSAGE;
1128                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1129                 goto f_err;
1130                 }
1131         p=d=(unsigned char *)s->init_msg;
1132
1133         if ((sk=sk_X509_new_null()) == NULL)
1134                 {
1135                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1136                 goto err;
1137                 }
1138
1139         n2l3(p,llen);
1140         if (llen+3 != n)
1141                 {
1142                 al=SSL_AD_DECODE_ERROR;
1143                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1144                 goto f_err;
1145                 }
1146         for (nc=0; nc<llen; )
1147                 {
1148                 n2l3(p,l);
1149                 if ((l+nc+3) > llen)
1150                         {
1151                         al=SSL_AD_DECODE_ERROR;
1152                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1153                         goto f_err;
1154                         }
1155
1156                 q=p;
1157                 x=d2i_X509(NULL,&q,l);
1158                 if (x == NULL)
1159                         {
1160                         al=SSL_AD_BAD_CERTIFICATE;
1161                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1162                         goto f_err;
1163                         }
1164                 if (q != (p+l))
1165                         {
1166                         al=SSL_AD_DECODE_ERROR;
1167                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1168                         goto f_err;
1169                         }
1170                 if (!sk_X509_push(sk,x))
1171                         {
1172                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1173                         goto err;
1174                         }
1175                 x=NULL;
1176                 nc+=l+3;
1177                 p=q;
1178                 }
1179
1180         i=ssl_verify_cert_chain(s,sk);
1181         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1182 #ifndef OPENSSL_NO_KRB5
1183             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1184                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1185 #endif /* OPENSSL_NO_KRB5 */
1186                 )
1187                 {
1188                 al=ssl_verify_alarm_type(s->verify_result);
1189                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1190                 goto f_err; 
1191                 }
1192         ERR_clear_error(); /* but we keep s->verify_result */
1193
1194         sc=ssl_sess_cert_new();
1195         if (sc == NULL) goto err;
1196
1197         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1198         s->session->sess_cert=sc;
1199
1200         sc->cert_chain=sk;
1201         /* Inconsistency alert: cert_chain does include the peer's
1202          * certificate, which we don't include in s3_srvr.c */
1203         x=sk_X509_value(sk,0);
1204         sk=NULL;
1205         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1206
1207         pkey=X509_get_pubkey(x);
1208
1209         /* VRS: allow null cert if auth == KRB5 */
1210         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1211                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1212                     ? 0 : 1;
1213
1214 #ifdef KSSL_DEBUG
1215         printf("pkey,x = %p, %p\n", pkey,x);
1216         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1217         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1218                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1219 #endif    /* KSSL_DEBUG */
1220
1221         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1222                 {
1223                 x=NULL;
1224                 al=SSL3_AL_FATAL;
1225                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1226                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1227                 goto f_err;
1228                 }
1229
1230         i=ssl_cert_type(x,pkey);
1231         if (need_cert && i < 0)
1232                 {
1233                 x=NULL;
1234                 al=SSL3_AL_FATAL;
1235                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1236                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1237                 goto f_err;
1238                 }
1239
1240         if (need_cert)
1241                 {
1242                 sc->peer_cert_type=i;
1243                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1244                 /* Why would the following ever happen?
1245                  * We just created sc a couple of lines ago. */
1246                 if (sc->peer_pkeys[i].x509 != NULL)
1247                         X509_free(sc->peer_pkeys[i].x509);
1248                 sc->peer_pkeys[i].x509=x;
1249                 sc->peer_key= &(sc->peer_pkeys[i]);
1250
1251                 if (s->session->peer != NULL)
1252                         X509_free(s->session->peer);
1253                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1254                 s->session->peer=x;
1255                 }
1256         else
1257                 {
1258                 sc->peer_cert_type=i;
1259                 sc->peer_key= NULL;
1260
1261                 if (s->session->peer != NULL)
1262                         X509_free(s->session->peer);
1263                 s->session->peer=NULL;
1264                 }
1265         s->session->verify_result = s->verify_result;
1266
1267         x=NULL;
1268         ret=1;
1269
1270         if (0)
1271                 {
1272 f_err:
1273                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1274                 }
1275 err:
1276         EVP_PKEY_free(pkey);
1277         X509_free(x);
1278         sk_X509_pop_free(sk,X509_free);
1279         return(ret);
1280         }
1281
1282 int ssl3_get_key_exchange(SSL *s)
1283         {
1284 #ifndef OPENSSL_NO_RSA
1285         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1286 #endif
1287         EVP_MD_CTX md_ctx;
1288         unsigned char *param,*p;
1289         int al,j,ok;
1290         long i,param_len,n,alg_k,alg_a;
1291         EVP_PKEY *pkey=NULL;
1292         const EVP_MD *md = NULL;
1293 #ifndef OPENSSL_NO_RSA
1294         RSA *rsa=NULL;
1295 #endif
1296 #ifndef OPENSSL_NO_DH
1297         DH *dh=NULL;
1298 #endif
1299 #ifndef OPENSSL_NO_ECDH
1300         EC_KEY *ecdh = NULL;
1301         BN_CTX *bn_ctx = NULL;
1302         EC_POINT *srvr_ecpoint = NULL;
1303         int curve_nid = 0;
1304         int encoded_pt_len = 0;
1305 #endif
1306
1307         /* use same message size as in ssl3_get_certificate_request()
1308          * as ServerKeyExchange message may be skipped */
1309         n=s->method->ssl_get_message(s,
1310                 SSL3_ST_CR_KEY_EXCH_A,
1311                 SSL3_ST_CR_KEY_EXCH_B,
1312                 -1,
1313                 s->max_cert_list,
1314                 &ok);
1315         if (!ok) return((int)n);
1316
1317         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1318                 {
1319 #ifndef OPENSSL_NO_PSK
1320                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1321                    omitted if no identity hint is sent. Set
1322                    session->sess_cert anyway to avoid problems
1323                    later.*/
1324                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1325                         {
1326                         s->session->sess_cert=ssl_sess_cert_new();
1327                         if (s->ctx->psk_identity_hint)
1328                                 OPENSSL_free(s->ctx->psk_identity_hint);
1329                         s->ctx->psk_identity_hint = NULL;
1330                         }
1331 #endif
1332                 s->s3->tmp.reuse_message=1;
1333                 return(1);
1334                 }
1335
1336         param=p=(unsigned char *)s->init_msg;
1337         if (s->session->sess_cert != NULL)
1338                 {
1339 #ifndef OPENSSL_NO_RSA
1340                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1341                         {
1342                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1343                         s->session->sess_cert->peer_rsa_tmp=NULL;
1344                         }
1345 #endif
1346 #ifndef OPENSSL_NO_DH
1347                 if (s->session->sess_cert->peer_dh_tmp)
1348                         {
1349                         DH_free(s->session->sess_cert->peer_dh_tmp);
1350                         s->session->sess_cert->peer_dh_tmp=NULL;
1351                         }
1352 #endif
1353 #ifndef OPENSSL_NO_ECDH
1354                 if (s->session->sess_cert->peer_ecdh_tmp)
1355                         {
1356                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1357                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1358                         }
1359 #endif
1360                 }
1361         else
1362                 {
1363                 s->session->sess_cert=ssl_sess_cert_new();
1364                 }
1365
1366         /* Total length of the parameters including the length prefix */
1367         param_len=0;
1368
1369         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1370         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1371         EVP_MD_CTX_init(&md_ctx);
1372
1373         al=SSL_AD_DECODE_ERROR;
1374
1375 #ifndef OPENSSL_NO_PSK
1376         if (alg_k & SSL_kPSK)
1377                 {
1378                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1379
1380                 param_len = 2;
1381                 if (param_len > n)
1382                         {
1383                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1384                                 SSL_R_LENGTH_TOO_SHORT);
1385                         goto f_err;
1386                         }
1387                 n2s(p,i);
1388
1389                 /* Store PSK identity hint for later use, hint is used
1390                  * in ssl3_send_client_key_exchange.  Assume that the
1391                  * maximum length of a PSK identity hint can be as
1392                  * long as the maximum length of a PSK identity. */
1393                 if (i > PSK_MAX_IDENTITY_LEN)
1394                         {
1395                         al=SSL_AD_HANDSHAKE_FAILURE;
1396                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1397                                 SSL_R_DATA_LENGTH_TOO_LONG);
1398                         goto f_err;
1399                         }
1400                 if (i > n - param_len)
1401                         {
1402                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1403                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1404                         goto f_err;
1405                         }
1406                 param_len += i;
1407
1408                 /* If received PSK identity hint contains NULL
1409                  * characters, the hint is truncated from the first
1410                  * NULL. p may not be ending with NULL, so create a
1411                  * NULL-terminated string. */
1412                 memcpy(tmp_id_hint, p, i);
1413                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1414                 if (s->ctx->psk_identity_hint != NULL)
1415                         OPENSSL_free(s->ctx->psk_identity_hint);
1416                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1417                 if (s->ctx->psk_identity_hint == NULL)
1418                         {
1419                         al=SSL_AD_HANDSHAKE_FAILURE;
1420                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1421                         goto f_err;
1422                         }          
1423
1424                 p+=i;
1425                 n-=param_len;
1426                 }
1427         else
1428 #endif /* !OPENSSL_NO_PSK */
1429 #ifndef OPENSSL_NO_SRP
1430         if (alg_k & SSL_kSRP)
1431                 {
1432                 param_len = 2;
1433                 if (param_len > n)
1434                         {
1435                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1436                                 SSL_R_LENGTH_TOO_SHORT);
1437                         goto f_err;
1438                         }
1439                 n2s(p,i);
1440
1441                 if (i > n - param_len)
1442                         {
1443                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1444                         goto f_err;
1445                         }
1446                 param_len += i;
1447
1448                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1449                         {
1450                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1451                         goto err;
1452                         }
1453                 p+=i;
1454
1455
1456                 if (2 > n - param_len)
1457                         {
1458                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1459                                 SSL_R_LENGTH_TOO_SHORT);
1460                         goto f_err;
1461                         }
1462                 param_len += 2;
1463
1464                 n2s(p,i);
1465
1466                 if (i > n - param_len)
1467                         {
1468                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1469                         goto f_err;
1470                         }
1471                 param_len += i;
1472
1473                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1474                         {
1475                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1476                         goto err;
1477                         }
1478                 p+=i;
1479
1480
1481                 if (1 > n - param_len)
1482                         {
1483                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1484                                 SSL_R_LENGTH_TOO_SHORT);
1485                         goto f_err;
1486                         }
1487                 param_len += 1;
1488
1489                 i = (unsigned int)(p[0]);
1490                 p++;
1491
1492                 if (i > n - param_len)
1493                         {
1494                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1495                         goto f_err;
1496                         }
1497                 param_len += i;
1498
1499                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1500                         {
1501                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1502                         goto err;
1503                         }
1504                 p+=i;
1505
1506                 if (2 > n - param_len)
1507                         {
1508                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1509                                 SSL_R_LENGTH_TOO_SHORT);
1510                         goto f_err;
1511                         }
1512                 param_len += 2;
1513
1514                 n2s(p,i);
1515
1516                 if (i > n - param_len)
1517                         {
1518                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1519                         goto f_err;
1520                         }
1521                 param_len += i;
1522
1523                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1524                         {
1525                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1526                         goto err;
1527                         }
1528                 p+=i;
1529                 n-=param_len;
1530
1531                 if (!srp_verify_server_param(s, &al))
1532                         {
1533                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1534                         goto f_err;
1535                         }
1536
1537 /* We must check if there is a certificate */
1538 #ifndef OPENSSL_NO_RSA
1539                 if (alg_a & SSL_aRSA)
1540                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1541 #else
1542                 if (0)
1543                         ;
1544 #endif
1545 #ifndef OPENSSL_NO_DSA
1546                 else if (alg_a & SSL_aDSS)
1547                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1548 #endif
1549                 }
1550         else
1551 #endif /* !OPENSSL_NO_SRP */
1552 #ifndef OPENSSL_NO_RSA
1553         if (alg_k & SSL_kRSA)
1554                 {
1555                 if ((rsa=RSA_new()) == NULL)
1556                         {
1557                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1558                         goto err;
1559                         }
1560
1561                 param_len = 2;
1562                 if (param_len > n)
1563                         {
1564                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1565                                 SSL_R_LENGTH_TOO_SHORT);
1566                         goto f_err;
1567                         }
1568                 n2s(p,i);
1569
1570                 if (i > n - param_len)
1571                         {
1572                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1573                         goto f_err;
1574                         }
1575                 param_len += i;
1576
1577                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1578                         {
1579                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1580                         goto err;
1581                         }
1582                 p+=i;
1583
1584                 if (2 > n - param_len)
1585                         {
1586                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1587                                 SSL_R_LENGTH_TOO_SHORT);
1588                         goto f_err;
1589                         }
1590                 param_len += 2;
1591
1592                 n2s(p,i);
1593
1594                 if (i > n - param_len)
1595                         {
1596                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1597                         goto f_err;
1598                         }
1599                 param_len += i;
1600
1601                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1602                         {
1603                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1604                         goto err;
1605                         }
1606                 p+=i;
1607                 n-=param_len;
1608
1609                 /* this should be because we are using an export cipher */
1610                 if (alg_a & SSL_aRSA)
1611                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1612                 else
1613                         {
1614                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1615                         goto err;
1616                         }
1617                 s->session->sess_cert->peer_rsa_tmp=rsa;
1618                 rsa=NULL;
1619                 }
1620 #else /* OPENSSL_NO_RSA */
1621         if (0)
1622                 ;
1623 #endif
1624 #ifndef OPENSSL_NO_DH
1625         else if (alg_k & SSL_kEDH)
1626                 {
1627                 if ((dh=DH_new()) == NULL)
1628                         {
1629                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1630                         goto err;
1631                         }
1632
1633                 param_len = 2;
1634                 if (param_len > n)
1635                         {
1636                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1637                                 SSL_R_LENGTH_TOO_SHORT);
1638                         goto f_err;
1639                         }
1640                 n2s(p,i);
1641
1642                 if (i > n - param_len)
1643                         {
1644                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1645                         goto f_err;
1646                         }
1647                 param_len += i;
1648
1649                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1650                         {
1651                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1652                         goto err;
1653                         }
1654                 p+=i;
1655
1656                 if (2 > n - param_len)
1657                         {
1658                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1659                                 SSL_R_LENGTH_TOO_SHORT);
1660                         goto f_err;
1661                         }
1662                 param_len += 2;
1663
1664                 n2s(p,i);
1665
1666                 if (i > n - param_len)
1667                         {
1668                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1669                         goto f_err;
1670                         }
1671                 param_len += i;
1672
1673                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1674                         {
1675                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1676                         goto err;
1677                         }
1678                 p+=i;
1679
1680                 if (2 > n - param_len)
1681                         {
1682                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1683                                 SSL_R_LENGTH_TOO_SHORT);
1684                         goto f_err;
1685                         }
1686                 param_len += 2;
1687
1688                 n2s(p,i);
1689
1690                 if (i > n - param_len)
1691                         {
1692                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1693                         goto f_err;
1694                         }
1695                 param_len += i;
1696
1697                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1698                         {
1699                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1700                         goto err;
1701                         }
1702                 p+=i;
1703                 n-=param_len;
1704
1705 #ifndef OPENSSL_NO_RSA
1706                 if (alg_a & SSL_aRSA)
1707                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1708 #else
1709                 if (0)
1710                         ;
1711 #endif
1712 #ifndef OPENSSL_NO_DSA
1713                 else if (alg_a & SSL_aDSS)
1714                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1715 #endif
1716                 /* else anonymous DH, so no certificate or pkey. */
1717
1718                 s->session->sess_cert->peer_dh_tmp=dh;
1719                 dh=NULL;
1720                 }
1721         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1722                 {
1723                 al=SSL_AD_ILLEGAL_PARAMETER;
1724                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1725                 goto f_err;
1726                 }
1727 #endif /* !OPENSSL_NO_DH */
1728
1729 #ifndef OPENSSL_NO_ECDH
1730         else if (alg_k & SSL_kEECDH)
1731                 {
1732                 EC_GROUP *ngroup;
1733                 const EC_GROUP *group;
1734
1735                 if ((ecdh=EC_KEY_new()) == NULL)
1736                         {
1737                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1738                         goto err;
1739                         }
1740
1741                 /* Extract elliptic curve parameters and the
1742                  * server's ephemeral ECDH public key.
1743                  * Keep accumulating lengths of various components in
1744                  * param_len and make sure it never exceeds n.
1745                  */
1746
1747                 /* XXX: For now we only support named (not generic) curves
1748                  * and the ECParameters in this case is just three bytes. We
1749                  * also need one byte for the length of the encoded point
1750                  */
1751                 param_len=4;
1752                 if (param_len > n)
1753                         {
1754                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1755                                 SSL_R_LENGTH_TOO_SHORT);
1756                         goto f_err;
1757                         }
1758
1759                 if ((*p != NAMED_CURVE_TYPE) || 
1760                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1761                         {
1762                         al=SSL_AD_INTERNAL_ERROR;
1763                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1764                         goto f_err;
1765                         }
1766
1767                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1768                 if (ngroup == NULL)
1769                         {
1770                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1771                         goto err;
1772                         }
1773                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1774                         {
1775                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1776                         goto err;
1777                         }
1778                 EC_GROUP_free(ngroup);
1779
1780                 group = EC_KEY_get0_group(ecdh);
1781
1782                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1783                     (EC_GROUP_get_degree(group) > 163))
1784                         {
1785                         al=SSL_AD_EXPORT_RESTRICTION;
1786                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1787                         goto f_err;
1788                         }
1789
1790                 p+=3;
1791
1792                 /* Next, get the encoded ECPoint */
1793                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1794                     ((bn_ctx = BN_CTX_new()) == NULL))
1795                         {
1796                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1797                         goto err;
1798                         }
1799
1800                 encoded_pt_len = *p;  /* length of encoded point */
1801                 p+=1;
1802
1803                 if ((encoded_pt_len > n - param_len) ||
1804                     (EC_POINT_oct2point(group, srvr_ecpoint, 
1805                         p, encoded_pt_len, bn_ctx) == 0))
1806                         {
1807                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1808                         goto f_err;
1809                         }
1810                 param_len += encoded_pt_len;
1811
1812                 n-=param_len;
1813                 p+=encoded_pt_len;
1814
1815                 /* The ECC/TLS specification does not mention
1816                  * the use of DSA to sign ECParameters in the server
1817                  * key exchange message. We do support RSA and ECDSA.
1818                  */
1819                 if (0) ;
1820 #ifndef OPENSSL_NO_RSA
1821                 else if (alg_a & SSL_aRSA)
1822                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1823 #endif
1824 #ifndef OPENSSL_NO_ECDSA
1825                 else if (alg_a & SSL_aECDSA)
1826                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1827 #endif
1828                 /* else anonymous ECDH, so no certificate or pkey. */
1829                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1830                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1831                 ecdh=NULL;
1832                 BN_CTX_free(bn_ctx);
1833                 bn_ctx = NULL;
1834                 EC_POINT_free(srvr_ecpoint);
1835                 srvr_ecpoint = NULL;
1836                 }
1837         else if (alg_k)
1838                 {
1839                 al=SSL_AD_UNEXPECTED_MESSAGE;
1840                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1841                 goto f_err;
1842                 }
1843 #endif /* !OPENSSL_NO_ECDH */
1844
1845
1846         /* p points to the next byte, there are 'n' bytes left */
1847
1848         /* if it was signed, check the signature */
1849         if (pkey != NULL)
1850                 {
1851                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1852                         {
1853                         int sigalg;
1854                         if (2 > n)
1855                                 {
1856                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1857                                         SSL_R_LENGTH_TOO_SHORT);
1858                                 goto f_err;
1859                                 }
1860
1861                         sigalg = tls12_get_sigid(pkey);
1862                         /* Should never happen */
1863                         if (sigalg == -1)
1864                                 {
1865                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1866                                 goto err;
1867                                 }
1868                         /* Check key type is consistent with signature */
1869                         if (sigalg != (int)p[1])
1870                                 {
1871                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1872                                 al=SSL_AD_DECODE_ERROR;
1873                                 goto f_err;
1874                                 }
1875                         md = tls12_get_hash(p[0]);
1876                         if (md == NULL)
1877                                 {
1878                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1879                                 goto f_err;
1880                                 }
1881 #ifdef SSL_DEBUG
1882 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1883 #endif
1884                         p += 2;
1885                         n -= 2;
1886                         }
1887                 else
1888                         md = EVP_sha1();
1889
1890                 if (2 > n)
1891                         {
1892                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1893                                 SSL_R_LENGTH_TOO_SHORT);
1894                         goto f_err;
1895                         }
1896                 n2s(p,i);
1897                 n-=2;
1898                 j=EVP_PKEY_size(pkey);
1899
1900                 /* Check signature length. If n is 0 then signature is empty */
1901                 if ((i != n) || (n > j) || (n <= 0))
1902                         {
1903                         /* wrong packet length */
1904                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1905                         goto f_err;
1906                         }
1907
1908 #ifndef OPENSSL_NO_RSA
1909                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1910                         {
1911                         int num;
1912                         unsigned int size;
1913
1914                         j=0;
1915                         q=md_buf;
1916                         for (num=2; num > 0; num--)
1917                                 {
1918                                 EVP_MD_CTX_set_flags(&md_ctx,
1919                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1920                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1921                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1922                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1923                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1924                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1925                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
1926                                 q+=size;
1927                                 j+=size;
1928                                 }
1929                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1930                                                                 pkey->pkey.rsa);
1931                         if (i < 0)
1932                                 {
1933                                 al=SSL_AD_DECRYPT_ERROR;
1934                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1935                                 goto f_err;
1936                                 }
1937                         if (i == 0)
1938                                 {
1939                                 /* bad signature */
1940                                 al=SSL_AD_DECRYPT_ERROR;
1941                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1942                                 goto f_err;
1943                                 }
1944                         }
1945                 else
1946 #endif
1947                         {
1948                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1949                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1950                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1951                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1952                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1953                                 {
1954                                 /* bad signature */
1955                                 al=SSL_AD_DECRYPT_ERROR;
1956                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1957                                 goto f_err;
1958                                 }
1959                         }
1960                 }
1961         else
1962                 {
1963                 /* aNULL, aSRP or kPSK do not need public keys */
1964                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
1965                         {
1966                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1967                         goto err;
1968                         }
1969                 /* still data left over */
1970                 if (n != 0)
1971                         {
1972                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1973                         goto f_err;
1974                         }
1975                 }
1976         EVP_PKEY_free(pkey);
1977         EVP_MD_CTX_cleanup(&md_ctx);
1978         return(1);
1979 f_err:
1980         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1981 err:
1982         EVP_PKEY_free(pkey);
1983 #ifndef OPENSSL_NO_RSA
1984         if (rsa != NULL)
1985                 RSA_free(rsa);
1986 #endif
1987 #ifndef OPENSSL_NO_DH
1988         if (dh != NULL)
1989                 DH_free(dh);
1990 #endif
1991 #ifndef OPENSSL_NO_ECDH
1992         BN_CTX_free(bn_ctx);
1993         EC_POINT_free(srvr_ecpoint);
1994         if (ecdh != NULL)
1995                 EC_KEY_free(ecdh);
1996 #endif
1997         EVP_MD_CTX_cleanup(&md_ctx);
1998         return(-1);
1999         }
2000
2001 int ssl3_get_certificate_request(SSL *s)
2002         {
2003         int ok,ret=0;
2004         unsigned long n,nc,l;
2005         unsigned int llen, ctype_num,i;
2006         X509_NAME *xn=NULL;
2007         const unsigned char *p,*q;
2008         unsigned char *d;
2009         STACK_OF(X509_NAME) *ca_sk=NULL;
2010
2011         n=s->method->ssl_get_message(s,
2012                 SSL3_ST_CR_CERT_REQ_A,
2013                 SSL3_ST_CR_CERT_REQ_B,
2014                 -1,
2015                 s->max_cert_list,
2016                 &ok);
2017
2018         if (!ok) return((int)n);
2019
2020         s->s3->tmp.cert_req=0;
2021
2022         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2023                 {
2024                 s->s3->tmp.reuse_message=1;
2025                 /* If we get here we don't need any cached handshake records
2026                  * as we wont be doing client auth.
2027                  */
2028                 if (s->s3->handshake_buffer)
2029                         {
2030                         if (!ssl3_digest_cached_records(s))
2031                                 goto err;
2032                         }
2033                 return(1);
2034                 }
2035
2036         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2037                 {
2038                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2039                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2040                 goto err;
2041                 }
2042
2043         /* TLS does not like anon-DH with client cert */
2044         if (s->version > SSL3_VERSION)
2045                 {
2046                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2047                         {
2048                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2049                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2050                         goto err;
2051                         }
2052                 }
2053
2054         p=d=(unsigned char *)s->init_msg;
2055
2056         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2057                 {
2058                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2059                 goto err;
2060                 }
2061
2062         /* get the certificate types */
2063         ctype_num= *(p++);
2064         if (ctype_num > SSL3_CT_NUMBER)
2065                 ctype_num=SSL3_CT_NUMBER;
2066         for (i=0; i<ctype_num; i++)
2067                 s->s3->tmp.ctype[i]= p[i];
2068         p+=ctype_num;
2069         if (TLS1_get_version(s) >= TLS1_2_VERSION)
2070                 {
2071                 n2s(p, llen);
2072                 /* Check we have enough room for signature algorithms and
2073                  * following length value.
2074                  */
2075                 if ((unsigned long)(p - d + llen + 2) > n)
2076                         {
2077                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2078                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2079                         goto err;
2080                         }
2081                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
2082                         {
2083                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2084                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2085                         goto err;
2086                         }
2087                 p += llen;
2088                 }
2089
2090         /* get the CA RDNs */
2091         n2s(p,llen);
2092 #if 0
2093 {
2094 FILE *out;
2095 out=fopen("/tmp/vsign.der","w");
2096 fwrite(p,1,llen,out);
2097 fclose(out);
2098 }
2099 #endif
2100
2101         if ((unsigned long)(p - d + llen) != n)
2102                 {
2103                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2104                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2105                 goto err;
2106                 }
2107
2108         for (nc=0; nc<llen; )
2109                 {
2110                 n2s(p,l);
2111                 if ((l+nc+2) > llen)
2112                         {
2113                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2114                                 goto cont; /* netscape bugs */
2115                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2116                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2117                         goto err;
2118                         }
2119
2120                 q=p;
2121
2122                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2123                         {
2124                         /* If netscape tolerance is on, ignore errors */
2125                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2126                                 goto cont;
2127                         else
2128                                 {
2129                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2130                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2131                                 goto err;
2132                                 }
2133                         }
2134
2135                 if (q != (p+l))
2136                         {
2137                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2138                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2139                         goto err;
2140                         }
2141                 if (!sk_X509_NAME_push(ca_sk,xn))
2142                         {
2143                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2144                         goto err;
2145                         }
2146
2147                 p+=l;
2148                 nc+=l+2;
2149                 }
2150
2151         if (0)
2152                 {
2153 cont:
2154                 ERR_clear_error();
2155                 }
2156
2157         /* we should setup a certificate to return.... */
2158         s->s3->tmp.cert_req=1;
2159         s->s3->tmp.ctype_num=ctype_num;
2160         if (s->s3->tmp.ca_names != NULL)
2161                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2162         s->s3->tmp.ca_names=ca_sk;
2163         ca_sk=NULL;
2164
2165         ret=1;
2166 err:
2167         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2168         return(ret);
2169         }
2170
2171 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2172         {
2173         return(X509_NAME_cmp(*a,*b));
2174         }
2175 #ifndef OPENSSL_NO_TLSEXT
2176 int ssl3_get_new_session_ticket(SSL *s)
2177         {
2178         int ok,al,ret=0, ticklen;
2179         long n;
2180         const unsigned char *p;
2181         unsigned char *d;
2182
2183         n=s->method->ssl_get_message(s,
2184                 SSL3_ST_CR_SESSION_TICKET_A,
2185                 SSL3_ST_CR_SESSION_TICKET_B,
2186                 -1,
2187                 16384,
2188                 &ok);
2189
2190         if (!ok)
2191                 return((int)n);
2192
2193         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2194                 {
2195                 s->s3->tmp.reuse_message=1;
2196                 return(1);
2197                 }
2198         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2199                 {
2200                 al=SSL_AD_UNEXPECTED_MESSAGE;
2201                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2202                 goto f_err;
2203                 }
2204         if (n < 6)
2205                 {
2206                 /* need at least ticket_lifetime_hint + ticket length */
2207                 al = SSL_AD_DECODE_ERROR;
2208                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2209                 goto f_err;
2210                 }
2211
2212         p=d=(unsigned char *)s->init_msg;
2213         n2l(p, s->session->tlsext_tick_lifetime_hint);
2214         n2s(p, ticklen);
2215         /* ticket_lifetime_hint + ticket_length + ticket */
2216         if (ticklen + 6 != n)
2217                 {
2218                 al = SSL_AD_DECODE_ERROR;
2219                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2220                 goto f_err;
2221                 }
2222         if (s->session->tlsext_tick)
2223                 {
2224                 OPENSSL_free(s->session->tlsext_tick);
2225                 s->session->tlsext_ticklen = 0;
2226                 }
2227         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2228         if (!s->session->tlsext_tick)
2229                 {
2230                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2231                 goto err;
2232                 }
2233         memcpy(s->session->tlsext_tick, p, ticklen);
2234         s->session->tlsext_ticklen = ticklen;
2235         /* There are two ways to detect a resumed ticket session.
2236          * One is to set an appropriate session ID and then the server
2237          * must return a match in ServerHello. This allows the normal
2238          * client session ID matching to work and we know much 
2239          * earlier that the ticket has been accepted.
2240          * 
2241          * The other way is to set zero length session ID when the
2242          * ticket is presented and rely on the handshake to determine
2243          * session resumption.
2244          *
2245          * We choose the former approach because this fits in with
2246          * assumptions elsewhere in OpenSSL. The session ID is set
2247          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2248          * ticket.
2249          */ 
2250         EVP_Digest(p, ticklen,
2251                         s->session->session_id, &s->session->session_id_length,
2252 #ifndef OPENSSL_NO_SHA256
2253                                                         EVP_sha256(), NULL);
2254 #else
2255                                                         EVP_sha1(), NULL);
2256 #endif
2257         ret=1;
2258         return(ret);
2259 f_err:
2260         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2261 err:
2262         return(-1);
2263         }
2264
2265 int ssl3_get_cert_status(SSL *s)
2266         {
2267         int ok, al;
2268         unsigned long resplen,n;
2269         const unsigned char *p;
2270
2271         n=s->method->ssl_get_message(s,
2272                 SSL3_ST_CR_CERT_STATUS_A,
2273                 SSL3_ST_CR_CERT_STATUS_B,
2274                 SSL3_MT_CERTIFICATE_STATUS,
2275                 16384,
2276                 &ok);
2277
2278         if (!ok) return((int)n);
2279         if (n < 4)
2280                 {
2281                 /* need at least status type + length */
2282                 al = SSL_AD_DECODE_ERROR;
2283                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2284                 goto f_err;
2285                 }
2286         p = (unsigned char *)s->init_msg;
2287         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2288                 {
2289                 al = SSL_AD_DECODE_ERROR;
2290                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2291                 goto f_err;
2292                 }
2293         n2l3(p, resplen);
2294         if (resplen + 4 != n)
2295                 {
2296                 al = SSL_AD_DECODE_ERROR;
2297                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2298                 goto f_err;
2299                 }
2300         if (s->tlsext_ocsp_resp)
2301                 OPENSSL_free(s->tlsext_ocsp_resp);
2302         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2303         if (!s->tlsext_ocsp_resp)
2304                 {
2305                 al = SSL_AD_INTERNAL_ERROR;
2306                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2307                 goto f_err;
2308                 }
2309         s->tlsext_ocsp_resplen = resplen;
2310         if (s->ctx->tlsext_status_cb)
2311                 {
2312                 int ret;
2313                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2314                 if (ret == 0)
2315                         {
2316                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2317                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2318                         goto f_err;
2319                         }
2320                 if (ret < 0)
2321                         {
2322                         al = SSL_AD_INTERNAL_ERROR;
2323                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2324                         goto f_err;
2325                         }
2326                 }
2327         return 1;
2328 f_err:
2329         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2330         return(-1);
2331         }
2332 #endif
2333
2334 int ssl3_get_server_done(SSL *s)
2335         {
2336         int ok,ret=0;
2337         long n;
2338
2339         n=s->method->ssl_get_message(s,
2340                 SSL3_ST_CR_SRVR_DONE_A,
2341                 SSL3_ST_CR_SRVR_DONE_B,
2342                 SSL3_MT_SERVER_DONE,
2343                 30, /* should be very small, like 0 :-) */
2344                 &ok);
2345
2346         if (!ok) return((int)n);
2347         if (n > 0)
2348                 {
2349                 /* should contain no data */
2350                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2351                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2352                 return -1;
2353                 }
2354         ret=1;
2355         return(ret);
2356         }
2357
2358
2359 int ssl3_send_client_key_exchange(SSL *s)
2360         {
2361         unsigned char *p,*d;
2362         int n;
2363         unsigned long alg_k;
2364 #ifndef OPENSSL_NO_RSA
2365         unsigned char *q;
2366         EVP_PKEY *pkey=NULL;
2367 #endif
2368 #ifndef OPENSSL_NO_KRB5
2369         KSSL_ERR kssl_err;
2370 #endif /* OPENSSL_NO_KRB5 */
2371 #ifndef OPENSSL_NO_ECDH
2372         EC_KEY *clnt_ecdh = NULL;
2373         const EC_POINT *srvr_ecpoint = NULL;
2374         EVP_PKEY *srvr_pub_pkey = NULL;
2375         unsigned char *encodedPoint = NULL;
2376         int encoded_pt_len = 0;
2377         BN_CTX * bn_ctx = NULL;
2378 #endif
2379
2380         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2381                 {
2382                 d=(unsigned char *)s->init_buf->data;
2383                 p= &(d[4]);
2384
2385                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2386
2387                 /* Fool emacs indentation */
2388                 if (0) {}
2389 #ifndef OPENSSL_NO_RSA
2390                 else if (alg_k & SSL_kRSA)
2391                         {
2392                         RSA *rsa;
2393                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2394
2395                         if (s->session->sess_cert == NULL)
2396                                 {
2397                                 /* We should always have a server certificate with SSL_kRSA. */
2398                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2399                                 goto err;
2400                                 }
2401
2402                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2403                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2404                         else
2405                                 {
2406                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2407                                 if ((pkey == NULL) ||
2408                                         (pkey->type != EVP_PKEY_RSA) ||
2409                                         (pkey->pkey.rsa == NULL))
2410                                         {
2411                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2412                                         goto err;
2413                                         }
2414                                 rsa=pkey->pkey.rsa;
2415                                 EVP_PKEY_free(pkey);
2416                                 }
2417                                 
2418                         tmp_buf[0]=s->client_version>>8;
2419                         tmp_buf[1]=s->client_version&0xff;
2420                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2421                                         goto err;
2422
2423                         s->session->master_key_length=sizeof tmp_buf;
2424
2425                         q=p;
2426                         /* Fix buf for TLS and beyond */
2427                         if (s->version > SSL3_VERSION)
2428                                 p+=2;
2429                         n=RSA_public_encrypt(sizeof tmp_buf,
2430                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2431 #ifdef PKCS1_CHECK
2432                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2433                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2434 #endif
2435                         if (n <= 0)
2436                                 {
2437                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2438                                 goto err;
2439                                 }
2440
2441                         /* Fix buf for TLS and beyond */
2442                         if (s->version > SSL3_VERSION)
2443                                 {
2444                                 s2n(n,q);
2445                                 n+=2;
2446                                 }
2447
2448                         s->session->master_key_length=
2449                                 s->method->ssl3_enc->generate_master_secret(s,
2450                                         s->session->master_key,
2451                                         tmp_buf,sizeof tmp_buf);
2452                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2453                         }
2454 #endif
2455 #ifndef OPENSSL_NO_KRB5
2456                 else if (alg_k & SSL_kKRB5)
2457                         {
2458                         krb5_error_code krb5rc;
2459                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2460                         /*  krb5_data   krb5_ap_req;  */
2461                         krb5_data       *enc_ticket;
2462                         krb5_data       authenticator, *authp = NULL;
2463                         EVP_CIPHER_CTX  ciph_ctx;
2464                         const EVP_CIPHER *enc = NULL;
2465                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2466                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2467                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
2468                                                 + EVP_MAX_IV_LENGTH];
2469                         int             padl, outl = sizeof(epms);
2470
2471                         EVP_CIPHER_CTX_init(&ciph_ctx);
2472
2473 #ifdef KSSL_DEBUG
2474                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2475                                 alg_k, SSL_kKRB5);
2476 #endif  /* KSSL_DEBUG */
2477
2478                         authp = NULL;
2479 #ifdef KRB5SENDAUTH
2480                         if (KRB5SENDAUTH)  authp = &authenticator;
2481 #endif  /* KRB5SENDAUTH */
2482
2483                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2484                                 &kssl_err);
2485                         enc = kssl_map_enc(kssl_ctx->enctype);
2486                         if (enc == NULL)
2487                             goto err;
2488 #ifdef KSSL_DEBUG
2489                         {
2490                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2491                         if (krb5rc && kssl_err.text)
2492                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2493                         }
2494 #endif  /* KSSL_DEBUG */
2495
2496                         if (krb5rc)
2497                                 {
2498                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2499                                                 SSL_AD_HANDSHAKE_FAILURE);
2500                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2501                                                 kssl_err.reason);
2502                                 goto err;
2503                                 }
2504
2505                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2506                         **  in place of RFC 2712 KerberosWrapper, as in:
2507                         **
2508                         **  Send ticket (copy to *p, set n = length)
2509                         **  n = krb5_ap_req.length;
2510                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2511                         **  if (krb5_ap_req.data)  
2512                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2513                         **
2514                         **  Now using real RFC 2712 KerberosWrapper
2515                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2516                         **  Note: 2712 "opaque" types are here replaced
2517                         **  with a 2-byte length followed by the value.
2518                         **  Example:
2519                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2520                         **  Where "xx xx" = length bytes.  Shown here with
2521                         **  optional authenticator omitted.
2522                         */
2523
2524                         /*  KerberosWrapper.Ticket              */
2525                         s2n(enc_ticket->length,p);
2526                         memcpy(p, enc_ticket->data, enc_ticket->length);
2527                         p+= enc_ticket->length;
2528                         n = enc_ticket->length + 2;
2529
2530                         /*  KerberosWrapper.Authenticator       */
2531                         if (authp  &&  authp->length)  
2532                                 {
2533                                 s2n(authp->length,p);
2534                                 memcpy(p, authp->data, authp->length);
2535                                 p+= authp->length;
2536                                 n+= authp->length + 2;
2537                                 
2538                                 free(authp->data);
2539                                 authp->data = NULL;
2540                                 authp->length = 0;
2541                                 }
2542                         else
2543                                 {
2544                                 s2n(0,p);/*  null authenticator length  */
2545                                 n+=2;
2546                                 }
2547  
2548                             tmp_buf[0]=s->client_version>>8;
2549                             tmp_buf[1]=s->client_version&0xff;
2550                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2551                                 goto err;
2552
2553                         /*  20010420 VRS.  Tried it this way; failed.
2554                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2555                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2556                         **                              kssl_ctx->length);
2557                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2558                         */
2559
2560                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2561                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2562                                 kssl_ctx->key,iv);
2563                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2564                                 sizeof tmp_buf);
2565                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2566                         outl += padl;
2567                         if (outl > (int)sizeof epms)
2568                                 {
2569                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2570                                 goto err;
2571                                 }
2572                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2573
2574                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2575                         s2n(outl,p);
2576                         memcpy(p, epms, outl);
2577                         p+=outl;
2578                         n+=outl + 2;
2579
2580                         s->session->master_key_length=
2581                                 s->method->ssl3_enc->generate_master_secret(s,
2582                                         s->session->master_key,
2583                                         tmp_buf, sizeof tmp_buf);
2584
2585                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2586                         OPENSSL_cleanse(epms, outl);
2587                         }
2588 #endif
2589 #ifndef OPENSSL_NO_DH
2590                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2591                         {
2592                         DH *dh_srvr,*dh_clnt;
2593
2594                         if (s->session->sess_cert == NULL) 
2595                                 {
2596                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2597                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2598                                 goto err;
2599                                 }
2600
2601                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2602                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2603                         else
2604                                 {
2605                                 /* we get them from the cert */
2606                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2607                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2608                                 goto err;
2609                                 }
2610                         
2611                         /* generate a new random key */
2612                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2613                                 {
2614                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2615                                 goto err;
2616                                 }
2617                         if (!DH_generate_key(dh_clnt))
2618                                 {
2619                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2620                                 DH_free(dh_clnt);
2621                                 goto err;
2622                                 }
2623
2624                         /* use the 'p' output buffer for the DH key, but
2625                          * make sure to clear it out afterwards */
2626
2627                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2628
2629                         if (n <= 0)
2630                                 {
2631                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2632                                 DH_free(dh_clnt);
2633                                 goto err;
2634                                 }
2635
2636                         /* generate master key from the result */
2637                         s->session->master_key_length=
2638                                 s->method->ssl3_enc->generate_master_secret(s,
2639                                         s->session->master_key,p,n);
2640                         /* clean up */
2641                         memset(p,0,n);
2642
2643                         /* send off the data */
2644                         n=BN_num_bytes(dh_clnt->pub_key);
2645                         s2n(n,p);
2646                         BN_bn2bin(dh_clnt->pub_key,p);
2647                         n+=2;
2648
2649                         DH_free(dh_clnt);
2650
2651                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2652                         }
2653 #endif
2654
2655 #ifndef OPENSSL_NO_ECDH 
2656                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2657                         {
2658                         const EC_GROUP *srvr_group = NULL;
2659                         EC_KEY *tkey;
2660                         int ecdh_clnt_cert = 0;
2661                         int field_size = 0;
2662
2663                         if (s->session->sess_cert == NULL) 
2664                                 {
2665                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2666                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2667                                 goto err;
2668                                 }
2669
2670                         /* Did we send out the client's
2671                          * ECDH share for use in premaster
2672                          * computation as part of client certificate?
2673                          * If so, set ecdh_clnt_cert to 1.
2674                          */
2675                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
2676                                 {
2677                                 /* XXX: For now, we do not support client
2678                                  * authentication using ECDH certificates.
2679                                  * To add such support, one needs to add
2680                                  * code that checks for appropriate 
2681                                  * conditions and sets ecdh_clnt_cert to 1.
2682                                  * For example, the cert have an ECC
2683                                  * key on the same curve as the server's
2684                                  * and the key should be authorized for
2685                                  * key agreement.
2686                                  *
2687                                  * One also needs to add code in ssl3_connect
2688                                  * to skip sending the certificate verify
2689                                  * message.
2690                                  *
2691                                  * if ((s->cert->key->privatekey != NULL) &&
2692                                  *     (s->cert->key->privatekey->type ==
2693                                  *      EVP_PKEY_EC) && ...)
2694                                  * ecdh_clnt_cert = 1;
2695                                  */
2696                                 }
2697
2698                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2699                                 {
2700                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2701                                 }
2702                         else
2703                                 {
2704                                 /* Get the Server Public Key from Cert */
2705                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2706                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2707                                 if ((srvr_pub_pkey == NULL) ||
2708                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2709                                     (srvr_pub_pkey->pkey.ec == NULL))
2710                                         {
2711                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2712                                             ERR_R_INTERNAL_ERROR);
2713                                         goto err;
2714                                         }
2715
2716                                 tkey = srvr_pub_pkey->pkey.ec;
2717                                 }
2718
2719                         srvr_group   = EC_KEY_get0_group(tkey);
2720                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2721
2722                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2723                                 {
2724                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2725                                     ERR_R_INTERNAL_ERROR);
2726                                 goto err;
2727                                 }
2728
2729                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
2730                                 {
2731                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2732                                 goto err;
2733                                 }
2734
2735                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2736                                 {
2737                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2738                                 goto err;
2739                                 }
2740                         if (ecdh_clnt_cert) 
2741                                 { 
2742                                 /* Reuse key info from our certificate
2743                                  * We only need our private key to perform
2744                                  * the ECDH computation.
2745                                  */
2746                                 const BIGNUM *priv_key;
2747                                 tkey = s->cert->key->privatekey->pkey.ec;
2748                                 priv_key = EC_KEY_get0_private_key(tkey);
2749                                 if (priv_key == NULL)
2750                                         {
2751                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2752                                         goto err;
2753                                         }
2754                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2755                                         {
2756                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2757                                         goto err;
2758                                         }
2759                                 }
2760                         else 
2761                                 {
2762                                 /* Generate a new ECDH key pair */
2763                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2764                                         {
2765                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2766                                         goto err;
2767                                         }
2768                                 }
2769
2770                         /* use the 'p' output buffer for the ECDH key, but
2771                          * make sure to clear it out afterwards
2772                          */
2773
2774                         field_size = EC_GROUP_get_degree(srvr_group);
2775                         if (field_size <= 0)
2776                                 {
2777                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2778                                        ERR_R_ECDH_LIB);
2779                                 goto err;
2780                                 }
2781                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2782                         if (n <= 0)
2783                                 {
2784                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2785                                        ERR_R_ECDH_LIB);
2786                                 goto err;
2787                                 }
2788
2789                         /* generate master key from the result */
2790                         s->session->master_key_length = s->method->ssl3_enc \
2791                             -> generate_master_secret(s, 
2792                                 s->session->master_key,
2793                                 p, n);
2794
2795                         memset(p, 0, n); /* clean up */
2796
2797                         if (ecdh_clnt_cert) 
2798                                 {
2799                                 /* Send empty client key exch message */
2800                                 n = 0;
2801                                 }
2802                         else 
2803                                 {
2804                                 /* First check the size of encoding and
2805                                  * allocate memory accordingly.
2806                                  */
2807                                 encoded_pt_len = 
2808                                     EC_POINT_point2oct(srvr_group, 
2809                                         EC_KEY_get0_public_key(clnt_ecdh), 
2810                                         POINT_CONVERSION_UNCOMPRESSED, 
2811                                         NULL, 0, NULL);
2812
2813                                 encodedPoint = (unsigned char *) 
2814                                     OPENSSL_malloc(encoded_pt_len * 
2815                                         sizeof(unsigned char)); 
2816                                 bn_ctx = BN_CTX_new();
2817                                 if ((encodedPoint == NULL) || 
2818                                     (bn_ctx == NULL)) 
2819                                         {
2820                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2821                                         goto err;
2822                                         }
2823
2824                                 /* Encode the public key */
2825                                 n = EC_POINT_point2oct(srvr_group, 
2826                                     EC_KEY_get0_public_key(clnt_ecdh), 
2827                                     POINT_CONVERSION_UNCOMPRESSED, 
2828                                     encodedPoint, encoded_pt_len, bn_ctx);
2829
2830                                 *p = n; /* length of encoded point */
2831                                 /* Encoded point will be copied here */
2832                                 p += 1; 
2833                                 /* copy the point */
2834                                 memcpy((unsigned char *)p, encodedPoint, n);
2835                                 /* increment n to account for length field */
2836                                 n += 1; 
2837                                 }
2838
2839                         /* Free allocated memory */
2840                         BN_CTX_free(bn_ctx);
2841                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2842                         if (clnt_ecdh != NULL) 
2843                                  EC_KEY_free(clnt_ecdh);
2844                         EVP_PKEY_free(srvr_pub_pkey);
2845                         }
2846 #endif /* !OPENSSL_NO_ECDH */
2847                 else if (alg_k & SSL_kGOST) 
2848                         {
2849                         /* GOST key exchange message creation */
2850                         EVP_PKEY_CTX *pkey_ctx;
2851                         X509 *peer_cert; 
2852                         size_t msglen;
2853                         unsigned int md_len;
2854                         int keytype;
2855                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2856                         EVP_MD_CTX *ukm_hash;
2857                         EVP_PKEY *pub_key;
2858
2859                         /* Get server sertificate PKEY and create ctx from it */
2860                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2861                         if (!peer_cert) 
2862                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2863                         if (!peer_cert)         {
2864                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2865                                         goto err;
2866                                 }       
2867                                 
2868                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2869                         /* If we have send a certificate, and certificate key
2870
2871                          * parameters match those of server certificate, use
2872                          * certificate key for key exchange
2873                          */
2874
2875                          /* Otherwise, generate ephemeral key pair */
2876                                         
2877                         EVP_PKEY_encrypt_init(pkey_ctx);
2878                           /* Generate session key */    
2879                     RAND_bytes(premaster_secret,32);
2880                         /* If we have client certificate, use its secret as peer key */
2881                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2882                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2883                                         /* If there was an error - just ignore it. Ephemeral key
2884                                         * would be used
2885                                         */
2886                                         ERR_clear_error();
2887                                 }
2888                         }                       
2889                         /* Compute shared IV and store it in algorithm-specific
2890                          * context data */
2891                         ukm_hash = EVP_MD_CTX_create();
2892                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2893                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2894                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2895                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2896                         EVP_MD_CTX_destroy(ukm_hash);
2897                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2898                                 8,shared_ukm)<0) {
2899                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2900                                                 SSL_R_LIBRARY_BUG);
2901                                         goto err;
2902                                 }       
2903                         /* Make GOST keytransport blob message */
2904                         /*Encapsulate it into sequence */
2905                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2906                         msglen=255;
2907                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2908                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2909                                         SSL_R_LIBRARY_BUG);
2910                                 goto err;
2911                         }
2912                         if (msglen >= 0x80)
2913                                 {
2914                                 *(p++)=0x81;
2915                                 *(p++)= msglen & 0xff;
2916                                 n=msglen+3;
2917                                 }
2918                         else
2919                                 {
2920                                 *(p++)= msglen & 0xff;
2921                                 n=msglen+2;
2922                                 }
2923                         memcpy(p, tmp, msglen);
2924                         /* Check if pubkey from client certificate was used */
2925                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2926                                 {
2927                                 /* Set flag "skip certificate verify" */
2928                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2929                                 }
2930                         EVP_PKEY_CTX_free(pkey_ctx);
2931                         s->session->master_key_length=
2932                                 s->method->ssl3_enc->generate_master_secret(s,
2933                                         s->session->master_key,premaster_secret,32);
2934                         EVP_PKEY_free(pub_key);
2935
2936                         }
2937 #ifndef OPENSSL_NO_SRP
2938                 else if (alg_k & SSL_kSRP)
2939                         {
2940                         if (s->srp_ctx.A != NULL)
2941                                 {
2942                                 /* send off the data */
2943                                 n=BN_num_bytes(s->srp_ctx.A);
2944                                 s2n(n,p);
2945                                 BN_bn2bin(s->srp_ctx.A,p);
2946                                 n+=2;
2947                                 }
2948                         else
2949                                 {
2950                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2951                                 goto err;
2952                                 }
2953                         if (s->session->srp_username != NULL)
2954                                 OPENSSL_free(s->session->srp_username);
2955                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2956                         if (s->session->srp_username == NULL)
2957                                 {
2958                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2959                                         ERR_R_MALLOC_FAILURE);
2960                                 goto err;
2961                                 }
2962
2963                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2964                                 {
2965                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2966                                 goto err;
2967                                 }
2968                         }
2969 #endif
2970 #ifndef OPENSSL_NO_PSK
2971                 else if (alg_k & SSL_kPSK)
2972                         {
2973                         /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes
2974                          * to return a \0-terminated identity. The last byte
2975                          * is for us for simulating strnlen. */
2976                         char identity[PSK_MAX_IDENTITY_LEN + 2];
2977                         size_t identity_len;
2978                         unsigned char *t = NULL;
2979                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2980                         unsigned int pre_ms_len = 0, psk_len = 0;
2981                         int psk_err = 1;
2982
2983                         n = 0;
2984                         if (s->psk_client_callback == NULL)
2985                                 {
2986                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2987                                         SSL_R_PSK_NO_CLIENT_CB);
2988                                 goto err;
2989                                 }
2990
2991                         memset(identity, 0, sizeof(identity));
2992                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2993                                 identity, sizeof(identity) - 1,
2994                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2995                         if (psk_len > PSK_MAX_PSK_LEN)
2996                                 {
2997                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2998                                         ERR_R_INTERNAL_ERROR);
2999                                 goto psk_err;
3000                                 }
3001                         else if (psk_len == 0)
3002                                 {
3003                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3004                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3005                                 goto psk_err;
3006                                 }
3007                         identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
3008                         identity_len = strlen(identity);
3009                         if (identity_len > PSK_MAX_IDENTITY_LEN)
3010                                 {
3011                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3012                                         ERR_R_INTERNAL_ERROR);
3013                                 goto psk_err;
3014                                 }
3015                         /* create PSK pre_master_secret */
3016                         pre_ms_len = 2+psk_len+2+psk_len;
3017                         t = psk_or_pre_ms;
3018                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3019                         s2n(psk_len, t);
3020                         memset(t, 0, psk_len);
3021                         t+=psk_len;
3022                         s2n(psk_len, t);
3023
3024                         if (s->session->psk_identity_hint != NULL)
3025                                 OPENSSL_free(s->session->psk_identity_hint);
3026                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3027                         if (s->ctx->psk_identity_hint != NULL &&
3028                                 s->session->psk_identity_hint == NULL)
3029                                 {
3030                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3031                                         ERR_R_MALLOC_FAILURE);
3032                                 goto psk_err;
3033                                 }
3034
3035                         if (s->session->psk_identity != NULL)
3036                                 OPENSSL_free(s->session->psk_identity);
3037                         s->session->psk_identity = BUF_strdup(identity);
3038                         if (s->session->psk_identity == NULL)
3039                                 {
3040                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3041                                         ERR_R_MALLOC_FAILURE);
3042                                 goto psk_err;
3043                                 }
3044
3045                         s->session->master_key_length =
3046                                 s->method->ssl3_enc->generate_master_secret(s,
3047                                         s->session->master_key,
3048                                         psk_or_pre_ms, pre_ms_len);
3049                         s2n(identity_len, p);
3050                         memcpy(p, identity, identity_len);
3051                         n = 2 + identity_len;
3052                         psk_err = 0;
3053                 psk_err:
3054                         OPENSSL_cleanse(identity, sizeof(identity));
3055                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3056                         if (psk_err != 0)
3057                                 {
3058                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3059                                 goto err;
3060                                 }
3061                         }
3062 #endif
3063                 else
3064                         {
3065                         ssl3_send_alert(s, SSL3_AL_FATAL,
3066                             SSL_AD_HANDSHAKE_FAILURE);
3067                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3068                             ERR_R_INTERNAL_ERROR);
3069                         goto err;
3070                         }
3071                 
3072                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
3073                 l2n3(n,d);
3074
3075                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3076                 /* number of bytes to write */
3077                 s->init_num=n+4;
3078                 s->init_off=0;
3079                 }
3080
3081         /* SSL3_ST_CW_KEY_EXCH_B */
3082         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3083 err:
3084 #ifndef OPENSSL_NO_ECDH
3085         BN_CTX_free(bn_ctx);
3086         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3087         if (clnt_ecdh != NULL) 
3088                 EC_KEY_free(clnt_ecdh);
3089         EVP_PKEY_free(srvr_pub_pkey);
3090 #endif
3091         return(-1);
3092         }
3093
3094 int ssl3_send_client_verify(SSL *s)
3095         {
3096         unsigned char *p,*d;
3097         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3098         EVP_PKEY *pkey;
3099         EVP_PKEY_CTX *pctx=NULL;
3100         EVP_MD_CTX mctx;
3101         unsigned u=0;
3102         unsigned long n;
3103         int j;
3104
3105         EVP_MD_CTX_init(&mctx);
3106
3107         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3108                 {
3109                 d=(unsigned char *)s->init_buf->data;
3110                 p= &(d[4]);
3111                 pkey=s->cert->key->privatekey;
3112 /* Create context from key and test if sha1 is allowed as digest */
3113                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3114                 EVP_PKEY_sign_init(pctx);
3115                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3116                         {
3117                         if (TLS1_get_version(s) < TLS1_2_VERSION)
3118                                 s->method->ssl3_enc->cert_verify_mac(s,
3119                                                 NID_sha1,
3120                                                 &(data[MD5_DIGEST_LENGTH]));
3121                         }
3122                 else
3123                         {
3124                         ERR_clear_error();
3125                         }
3126                 /* For TLS v1.2 send signature algorithm and signature
3127                  * using agreed digest and cached handshake records.
3128                  */
3129                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3130                         {
3131                         long hdatalen = 0;
3132                         void *hdata;
3133                         const EVP_MD *md = s->cert->key->digest;
3134                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3135                                                                 &hdata);
3136                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3137                                 {
3138                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3139                                                 ERR_R_INTERNAL_ERROR);
3140                                 goto err;
3141                                 }
3142                         p += 2;
3143 #ifdef SSL_DEBUG
3144                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3145                                                         EVP_MD_name(md));
3146 #endif
3147                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3148                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3149                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3150                                 {
3151                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3152                                                 ERR_R_EVP_LIB);
3153                                 goto err;
3154                                 }
3155                         s2n(u,p);
3156                         n = u + 4;
3157                         if (!ssl3_digest_cached_records(s))
3158                                 goto err;
3159                         }
3160                 else
3161 #ifndef OPENSSL_NO_RSA
3162                 if (pkey->type == EVP_PKEY_RSA)
3163                         {
3164                         s->method->ssl3_enc->cert_verify_mac(s,
3165                                 NID_md5,
3166                                 &(data[0]));
3167                         if (RSA_sign(NID_md5_sha1, data,
3168                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3169                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3170                                 {
3171                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3172                                 goto err;
3173                                 }
3174                         s2n(u,p);
3175                         n=u+2;
3176                         }
3177                 else
3178 #endif
3179 #ifndef OPENSSL_NO_DSA
3180                         if (pkey->type == EVP_PKEY_DSA)
3181                         {
3182                         if (!DSA_sign(pkey->save_type,
3183                                 &(data[MD5_DIGEST_LENGTH]),
3184                                 SHA_DIGEST_LENGTH,&(p[2]),
3185                                 (unsigned int *)&j,pkey->pkey.dsa))
3186                                 {
3187                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3188                                 goto err;
3189                                 }
3190                         s2n(j,p);
3191                         n=j+2;
3192                         }
3193                 else
3194 #endif
3195 #ifndef OPENSSL_NO_ECDSA
3196                         if (pkey->type == EVP_PKEY_EC)
3197                         {
3198                         if (!ECDSA_sign(pkey->save_type,
3199                                 &(data[MD5_DIGEST_LENGTH]),
3200                                 SHA_DIGEST_LENGTH,&(p[2]),
3201                                 (unsigned int *)&j,pkey->pkey.ec))
3202                                 {
3203                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3204                                     ERR_R_ECDSA_LIB);
3205                                 goto err;
3206                                 }
3207                         s2n(j,p);
3208                         n=j+2;
3209                         }
3210                 else
3211 #endif
3212                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) 
3213                 {
3214                 unsigned char signbuf[64];
3215                 int i;
3216                 size_t sigsize=64;
3217                 s->method->ssl3_enc->cert_verify_mac(s,
3218                         NID_id_GostR3411_94,
3219                         data);
3220                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3221                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3222                         ERR_R_INTERNAL_ERROR);
3223                         goto err;
3224                 }
3225                 for (i=63,j=0; i>=0; j++, i--) {
3226                         p[2+j]=signbuf[i];
3227                 }       
3228                 s2n(j,p);
3229                 n=j+2;
3230                 }
3231                 else
3232                 {
3233                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3234                         goto err;
3235                 }
3236                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3237                 l2n3(n,d);
3238
3239                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3240                 s->init_num=(int)n+4;
3241                 s->init_off=0;
3242                 }
3243         EVP_MD_CTX_cleanup(&mctx);
3244         EVP_PKEY_CTX_free(pctx);
3245         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3246 err:
3247         EVP_MD_CTX_cleanup(&mctx);
3248         EVP_PKEY_CTX_free(pctx);
3249         return(-1);
3250         }
3251
3252 int ssl3_send_client_certificate(SSL *s)
3253         {
3254         X509 *x509=NULL;
3255         EVP_PKEY *pkey=NULL;
3256         int i;
3257         unsigned long l;
3258
3259         if (s->state == SSL3_ST_CW_CERT_A)
3260                 {
3261                 if ((s->cert == NULL) ||
3262                         (s->cert->key->x509 == NULL) ||
3263                         (s->cert->key->privatekey == NULL))
3264                         s->state=SSL3_ST_CW_CERT_B;
3265                 else
3266                         s->state=SSL3_ST_CW_CERT_C;
3267                 }
3268
3269         /* We need to get a client cert */
3270         if (s->state == SSL3_ST_CW_CERT_B)
3271                 {
3272                 /* If we get an error, we need to
3273                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3274                  * We then get retied later */
3275                 i=0;
3276                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3277                 if (i < 0)
3278                         {
3279                         s->rwstate=SSL_X509_LOOKUP;
3280                         return(-1);
3281                         }
3282                 s->rwstate=SSL_NOTHING;
3283                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3284                         {
3285                         s->state=SSL3_ST_CW_CERT_B;
3286                         if (    !SSL_use_certificate(s,x509) ||
3287                                 !SSL_use_PrivateKey(s,pkey))
3288                                 i=0;
3289                         }
3290                 else if (i == 1)
3291                         {
3292                         i=0;
3293                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3294                         }
3295
3296                 if (x509 != NULL) X509_free(x509);
3297                 if (pkey != NULL) EVP_PKEY_free(pkey);
3298                 if (i == 0)
3299                         {
3300                         if (s->version == SSL3_VERSION)
3301                                 {
3302                                 s->s3->tmp.cert_req=0;
3303                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3304                                 return(1);
3305                                 }
3306                         else
3307                                 {
3308                                 s->s3->tmp.cert_req=2;
3309                                 }
3310                         }
3311
3312                 /* Ok, we have a cert */
3313                 s->state=SSL3_ST_CW_CERT_C;
3314                 }
3315
3316         if (s->state == SSL3_ST_CW_CERT_C)
3317                 {
3318                 s->state=SSL3_ST_CW_CERT_D;
3319                 l=ssl3_output_cert_chain(s,
3320                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
3321                 s->init_num=(int)l;
3322                 s->init_off=0;
3323                 }
3324         /* SSL3_ST_CW_CERT_D */
3325         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3326         }
3327
3328 #define has_bits(i,m)   (((i)&(m)) == (m))
3329
3330 int ssl3_check_cert_and_algorithm(SSL *s)
3331         {
3332         int i,idx;
3333         long alg_k,alg_a;
3334         EVP_PKEY *pkey=NULL;
3335         SESS_CERT *sc;
3336 #ifndef OPENSSL_NO_RSA
3337         RSA *rsa;
3338 #endif
3339 #ifndef OPENSSL_NO_DH
3340         DH *dh;
3341 #endif
3342
3343         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3344         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3345
3346         /* we don't have a certificate */
3347         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3348                 return(1);
3349
3350         sc=s->session->sess_cert;
3351         if (sc == NULL)
3352                 {
3353                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3354                 goto err;
3355                 }
3356
3357 #ifndef OPENSSL_NO_RSA
3358         rsa=s->session->sess_cert->peer_rsa_tmp;
3359 #endif
3360 #ifndef OPENSSL_NO_DH
3361         dh=s->session->sess_cert->peer_dh_tmp;
3362 #endif
3363
3364         /* This is the passed certificate */
3365
3366         idx=sc->peer_cert_type;
3367 #ifndef OPENSSL_NO_ECDH
3368         if (idx == SSL_PKEY_ECC)
3369                 {
3370                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3371                                                                 s) == 0) 
3372                         { /* check failed */
3373                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3374                         goto f_err;
3375                         }
3376                 else 
3377                         {
3378                         return 1;
3379                         }
3380                 }
3381 #endif
3382         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3383         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3384         EVP_PKEY_free(pkey);
3385
3386         
3387         /* Check that we have a certificate if we require one */
3388         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3389                 {
3390                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3391                 goto f_err;
3392                 }
3393 #ifndef OPENSSL_NO_DSA
3394         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3395                 {
3396                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3397                 goto f_err;
3398                 }
3399 #endif
3400 #ifndef OPENSSL_NO_RSA
3401         if ((alg_k & SSL_kRSA) &&
3402                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3403                 {
3404                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3405                 goto f_err;
3406                 }
3407 #endif
3408 #ifndef OPENSSL_NO_DH
3409         if ((alg_k & SSL_kEDH) &&
3410                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3411                 {
3412                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3413                 goto f_err;
3414                 }
3415         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3416                 {
3417                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3418                 goto f_err;
3419                 }
3420 #ifndef OPENSSL_NO_DSA
3421         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3422                 {
3423                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3424                 goto f_err;
3425                 }
3426 #endif
3427 #endif
3428
3429         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3430                 {
3431 #ifndef OPENSSL_NO_RSA
3432                 if (alg_k & SSL_kRSA)
3433                         {
3434                         if (rsa == NULL
3435                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3436                                 {
3437                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3438                                 goto f_err;
3439                                 }
3440                         }
3441                 else
3442 #endif
3443 #ifndef OPENSSL_NO_DH
3444                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3445                             {
3446                             if (dh == NULL
3447                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3448                                 {
3449                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3450                                 goto f_err;
3451                                 }
3452                         }
3453                 else
3454 #endif
3455                         {
3456                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3457                         goto f_err;
3458                         }
3459                 }
3460         return(1);
3461 f_err:
3462         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3463 err:
3464         return(0);
3465         }
3466
3467 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3468 int ssl3_send_next_proto(SSL *s)
3469         {
3470         unsigned int len, padding_len;
3471         unsigned char *d;
3472
3473         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3474                 {
3475                 len = s->next_proto_negotiated_len;
3476                 padding_len = 32 - ((len + 2) % 32);
3477                 d = (unsigned char *)s->init_buf->data;
3478                 d[4] = len;
3479                 memcpy(d + 5, s->next_proto_negotiated, len);
3480                 d[5 + len] = padding_len;
3481                 memset(d + 6 + len, 0, padding_len);
3482                 *(d++)=SSL3_MT_NEXT_PROTO;
3483                 l2n3(2 + len + padding_len, d);
3484                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3485                 s->init_num = 4 + 2 + len + padding_len;
3486                 s->init_off = 0;
3487                 }
3488
3489         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3490 }
3491 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3492
3493 /* Check to see if handshake is full or resumed. Usually this is just a
3494  * case of checking to see if a cache hit has occurred. In the case of
3495  * session tickets we have to check the next message to be sure.
3496  */
3497
3498 #ifndef OPENSSL_NO_TLSEXT
3499 int ssl3_check_finished(SSL *s)
3500         {
3501         int ok;
3502         long n;
3503         /* If we have no ticket it cannot be a resumed session. */
3504         if (!s->session->tlsext_tick)
3505                 return 1;
3506         /* this function is called when we really expect a Certificate
3507          * message, so permit appropriate message length */
3508         n=s->method->ssl_get_message(s,
3509                 SSL3_ST_CR_CERT_A,
3510                 SSL3_ST_CR_CERT_B,
3511                 -1,
3512                 s->max_cert_list,
3513                 &ok);
3514         if (!ok) return((int)n);
3515         s->s3->tmp.reuse_message = 1;
3516         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3517                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3518                 return 2;
3519
3520         return 1;
3521         }
3522 #endif
3523
3524 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3525         {
3526         int i = 0;
3527 #ifndef OPENSSL_NO_ENGINE
3528         if (s->ctx->client_cert_engine)
3529                 {
3530                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3531                                                 SSL_get_client_CA_list(s),
3532                                                 px509, ppkey, NULL, NULL, NULL);
3533                 if (i != 0)
3534                         return i;
3535                 }
3536 #endif
3537         if (s->ctx->client_cert_cb)
3538                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3539         return i;
3540         }