typo
[openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #include <stdio.h>
152 #include "ssl_locl.h"
153 #include "kssl_lcl.h"
154 #include <openssl/buffer.h>
155 #include <openssl/rand.h>
156 #include <openssl/objects.h>
157 #include <openssl/evp.h>
158 #include <openssl/md5.h>
159 #ifdef OPENSSL_FIPS
160 #include <openssl/fips.h>
161 #endif
162 #ifndef OPENSSL_NO_DH
163 #include <openssl/dh.h>
164 #endif
165 #include <openssl/bn.h>
166 #ifndef OPENSSL_NO_ENGINE
167 #include <openssl/engine.h>
168 #endif
169
170 static const SSL_METHOD *ssl3_get_client_method(int ver);
171 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
172
173 static const SSL_METHOD *ssl3_get_client_method(int ver)
174         {
175         if (ver == SSL3_VERSION)
176                 return(SSLv3_client_method());
177         else
178                 return(NULL);
179         }
180
181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
182                         ssl_undefined_function,
183                         ssl3_connect,
184                         ssl3_get_client_method)
185
186 int ssl3_connect(SSL *s)
187         {
188         BUF_MEM *buf=NULL;
189         unsigned long Time=(unsigned long)time(NULL);
190         void (*cb)(const SSL *ssl,int type,int val)=NULL;
191         int ret= -1;
192         int new_state,state,skip=0;
193
194         RAND_add(&Time,sizeof(Time),0);
195         ERR_clear_error();
196         clear_sys_error();
197
198         if (s->info_callback != NULL)
199                 cb=s->info_callback;
200         else if (s->ctx->info_callback != NULL)
201                 cb=s->ctx->info_callback;
202         
203         s->in_handshake++;
204         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
205
206 #ifndef OPENSSL_NO_HEARTBEATS
207         /* If we're awaiting a HeartbeatResponse, pretend we
208          * already got and don't await it anymore, because
209          * Heartbeats don't make sense during handshakes anyway.
210          */
211         if (s->tlsext_hb_pending)
212                 {
213                 s->tlsext_hb_pending = 0;
214                 s->tlsext_hb_seq++;
215                 }
216 #endif
217
218         for (;;)
219                 {
220                 state=s->state;
221
222                 switch(s->state)
223                         {
224                 case SSL_ST_RENEGOTIATE:
225                         s->renegotiate=1;
226                         s->state=SSL_ST_CONNECT;
227                         s->ctx->stats.sess_connect_renegotiate++;
228                         /* break */
229                 case SSL_ST_BEFORE:
230                 case SSL_ST_CONNECT:
231                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
232                 case SSL_ST_OK|SSL_ST_CONNECT:
233
234                         s->server=0;
235                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
236
237                         if ((s->version & 0xff00 ) != 0x0300)
238                                 {
239                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
240                                 ret = -1;
241                                 goto end;
242                                 }
243                                 
244                         /* s->version=SSL3_VERSION; */
245                         s->type=SSL_ST_CONNECT;
246
247                         if (s->init_buf == NULL)
248                                 {
249                                 if ((buf=BUF_MEM_new()) == NULL)
250                                         {
251                                         ret= -1;
252                                         goto end;
253                                         }
254                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
255                                         {
256                                         ret= -1;
257                                         goto end;
258                                         }
259                                 s->init_buf=buf;
260                                 buf=NULL;
261                                 }
262
263                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
264
265                         /* setup buffing BIO */
266                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
267
268                         /* don't push the buffering BIO quite yet */
269
270                         ssl3_init_finished_mac(s);
271
272                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
273                         s->ctx->stats.sess_connect++;
274                         s->init_num=0;
275                         break;
276
277                 case SSL3_ST_CW_CLNT_HELLO_A:
278                 case SSL3_ST_CW_CLNT_HELLO_B:
279
280                         s->shutdown=0;
281                         ret=ssl3_client_hello(s);
282                         if (ret <= 0) goto end;
283                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
284                         s->init_num=0;
285
286                         /* turn on buffering for the next lot of output */
287                         if (s->bbio != s->wbio)
288                                 s->wbio=BIO_push(s->bbio,s->wbio);
289
290                         break;
291
292                 case SSL3_ST_CR_SRVR_HELLO_A:
293                 case SSL3_ST_CR_SRVR_HELLO_B:
294                         ret=ssl3_get_server_hello(s);
295                         if (ret <= 0) goto end;
296
297                         if (s->hit)
298                                 {
299                                 s->state=SSL3_ST_CR_FINISHED_A;
300 #ifndef OPENSSL_NO_TLSEXT
301                                 if (s->tlsext_ticket_expected)
302                                         {
303                                         /* receive renewed session ticket */
304                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
305                                         }
306 #endif
307                                 }
308                         else
309                                 {
310 #ifndef OPENSSL_NO_TLSEXT
311                                 /* The server hello indicated that
312                                  * an audit proof would follow. */
313                                 if (s->s3->tlsext_authz_server_promised)
314                                         s->state=SSL3_ST_CR_SUPPLEMENTAL_DATA_A;
315                                 else
316 #endif
317                                         s->state=SSL3_ST_CR_CERT_A;
318                                 }
319                         s->init_num=0;
320                         break;
321 #ifndef OPENSSL_NO_TLSEXT
322                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_A:
323                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_B:
324                         ret = tls1_get_server_supplemental_data(s);
325                         if (ret <= 0) goto end;
326                         s->state=SSL3_ST_CR_CERT_A;
327                         s->init_num = 0;
328                         break;
329 #endif
330                 case SSL3_ST_CR_CERT_A:
331                 case SSL3_ST_CR_CERT_B:
332 #ifndef OPENSSL_NO_TLSEXT
333                         ret=ssl3_check_finished(s);
334                         if (ret <= 0) goto end;
335                         if (ret == 2)
336                                 {
337                                 s->hit = 1;
338                                 if (s->tlsext_ticket_expected)
339                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
340                                 else
341                                         s->state=SSL3_ST_CR_FINISHED_A;
342                                 s->init_num=0;
343                                 break;
344                                 }
345 #endif
346                         /* Check if it is anon DH/ECDH */
347                         /* or PSK */
348                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
349                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
350                                 {
351                                 ret=ssl3_get_server_certificate(s);
352                                 if (ret <= 0) goto end;
353 #ifndef OPENSSL_NO_TLSEXT
354                                 if (s->tlsext_status_expected)
355                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
356                                 else
357                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
358                                 }
359                         else
360                                 {
361                                 skip = 1;
362                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
363                                 }
364 #else
365                                 }
366                         else
367                                 skip=1;
368
369                         s->state=SSL3_ST_CR_KEY_EXCH_A;
370 #endif
371                         s->init_num=0;
372                         break;
373
374                 case SSL3_ST_CR_KEY_EXCH_A:
375                 case SSL3_ST_CR_KEY_EXCH_B:
376                         ret=ssl3_get_key_exchange(s);
377                         if (ret <= 0) goto end;
378                         s->state=SSL3_ST_CR_CERT_REQ_A;
379                         s->init_num=0;
380
381                         /* at this point we check that we have the
382                          * required stuff from the server */
383                         if (!ssl3_check_cert_and_algorithm(s))
384                                 {
385                                 ret= -1;
386                                 goto end;
387                                 }
388                         break;
389
390                 case SSL3_ST_CR_CERT_REQ_A:
391                 case SSL3_ST_CR_CERT_REQ_B:
392                         ret=ssl3_get_certificate_request(s);
393                         if (ret <= 0) goto end;
394                         s->state=SSL3_ST_CR_SRVR_DONE_A;
395                         s->init_num=0;
396                         break;
397
398                 case SSL3_ST_CR_SRVR_DONE_A:
399                 case SSL3_ST_CR_SRVR_DONE_B:
400                         ret=ssl3_get_server_done(s);
401                         if (ret <= 0) goto end;
402 #ifndef OPENSSL_NO_SRP
403                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
404                                 {
405                                 if ((ret = SRP_Calc_A_param(s))<=0)
406                                         {
407                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
408                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
409                                         goto end;
410                                         }
411                                 }
412 #endif
413                         if (s->s3->tmp.cert_req)
414                                 s->state=SSL3_ST_CW_CERT_A;
415                         else
416                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
417                         s->init_num=0;
418
419                         break;
420
421                 case SSL3_ST_CW_CERT_A:
422                 case SSL3_ST_CW_CERT_B:
423                 case SSL3_ST_CW_CERT_C:
424                 case SSL3_ST_CW_CERT_D:
425                         ret=ssl3_send_client_certificate(s);
426                         if (ret <= 0) goto end;
427                         s->state=SSL3_ST_CW_KEY_EXCH_A;
428                         s->init_num=0;
429                         break;
430
431                 case SSL3_ST_CW_KEY_EXCH_A:
432                 case SSL3_ST_CW_KEY_EXCH_B:
433                         ret=ssl3_send_client_key_exchange(s);
434                         if (ret <= 0) goto end;
435                         /* EAY EAY EAY need to check for DH fix cert
436                          * sent back */
437                         /* For TLS, cert_req is set to 2, so a cert chain
438                          * of nothing is sent, but no verify packet is sent */
439                         /* XXX: For now, we do not support client 
440                          * authentication in ECDH cipher suites with
441                          * ECDH (rather than ECDSA) certificates.
442                          * We need to skip the certificate verify 
443                          * message when client's ECDH public key is sent 
444                          * inside the client certificate.
445                          */
446                         if (s->s3->tmp.cert_req == 1)
447                                 {
448                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
449                                 }
450                         else
451                                 {
452                                 s->state=SSL3_ST_CW_CHANGE_A;
453                                 s->s3->change_cipher_spec=0;
454                                 }
455                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
456                                 {
457                                 s->state=SSL3_ST_CW_CHANGE_A;
458                                 s->s3->change_cipher_spec=0;
459                                 }
460
461                         s->init_num=0;
462                         break;
463
464                 case SSL3_ST_CW_CERT_VRFY_A:
465                 case SSL3_ST_CW_CERT_VRFY_B:
466                         ret=ssl3_send_client_verify(s);
467                         if (ret <= 0) goto end;
468                         s->state=SSL3_ST_CW_CHANGE_A;
469                         s->init_num=0;
470                         s->s3->change_cipher_spec=0;
471                         break;
472
473                 case SSL3_ST_CW_CHANGE_A:
474                 case SSL3_ST_CW_CHANGE_B:
475                         ret=ssl3_send_change_cipher_spec(s,
476                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
477                         if (ret <= 0) goto end;
478
479 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
480                         s->state=SSL3_ST_CW_FINISHED_A;
481 #else
482                         if (s->s3->next_proto_neg_seen)
483                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
484                         else
485                                 s->state=SSL3_ST_CW_FINISHED_A;
486 #endif
487                         s->init_num=0;
488
489                         s->session->cipher=s->s3->tmp.new_cipher;
490 #ifdef OPENSSL_NO_COMP
491                         s->session->compress_meth=0;
492 #else
493                         if (s->s3->tmp.new_compression == NULL)
494                                 s->session->compress_meth=0;
495                         else
496                                 s->session->compress_meth=
497                                         s->s3->tmp.new_compression->id;
498 #endif
499                         if (!s->method->ssl3_enc->setup_key_block(s))
500                                 {
501                                 ret= -1;
502                                 goto end;
503                                 }
504
505                         if (!s->method->ssl3_enc->change_cipher_state(s,
506                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
507                                 {
508                                 ret= -1;
509                                 goto end;
510                                 }
511
512                         break;
513
514 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
515                 case SSL3_ST_CW_NEXT_PROTO_A:
516                 case SSL3_ST_CW_NEXT_PROTO_B:
517                         ret=ssl3_send_next_proto(s);
518                         if (ret <= 0) goto end;
519                         s->state=SSL3_ST_CW_FINISHED_A;
520                         break;
521 #endif
522
523                 case SSL3_ST_CW_FINISHED_A:
524                 case SSL3_ST_CW_FINISHED_B:
525                         ret=ssl3_send_finished(s,
526                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
527                                 s->method->ssl3_enc->client_finished_label,
528                                 s->method->ssl3_enc->client_finished_label_len);
529                         if (ret <= 0) goto end;
530                         s->state=SSL3_ST_CW_FLUSH;
531
532                         /* clear flags */
533                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
534                         if (s->hit)
535                                 {
536                                 s->s3->tmp.next_state=SSL_ST_OK;
537                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
538                                         {
539                                         s->state=SSL_ST_OK;
540                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
541                                         s->s3->delay_buf_pop_ret=0;
542                                         }
543                                 }
544                         else
545                                 {
546 #ifndef OPENSSL_NO_TLSEXT
547                                 /* Allow NewSessionTicket if ticket expected */
548                                 if (s->tlsext_ticket_expected)
549                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
550                                 else
551 #endif
552                                 
553                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
554                                 }
555                         s->init_num=0;
556                         break;
557
558 #ifndef OPENSSL_NO_TLSEXT
559                 case SSL3_ST_CR_SESSION_TICKET_A:
560                 case SSL3_ST_CR_SESSION_TICKET_B:
561                         ret=ssl3_get_new_session_ticket(s);
562                         if (ret <= 0) goto end;
563                         s->state=SSL3_ST_CR_FINISHED_A;
564                         s->init_num=0;
565                 break;
566
567                 case SSL3_ST_CR_CERT_STATUS_A:
568                 case SSL3_ST_CR_CERT_STATUS_B:
569                         ret=ssl3_get_cert_status(s);
570                         if (ret <= 0) goto end;
571                         s->state=SSL3_ST_CR_KEY_EXCH_A;
572                         s->init_num=0;
573                 break;
574 #endif
575
576                 case SSL3_ST_CR_FINISHED_A:
577                 case SSL3_ST_CR_FINISHED_B:
578
579                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
580                                 SSL3_ST_CR_FINISHED_B);
581                         if (ret <= 0) goto end;
582
583                         if (s->hit)
584                                 s->state=SSL3_ST_CW_CHANGE_A;
585                         else
586                                 s->state=SSL_ST_OK;
587                         s->init_num=0;
588                         break;
589
590                 case SSL3_ST_CW_FLUSH:
591                         s->rwstate=SSL_WRITING;
592                         if (BIO_flush(s->wbio) <= 0)
593                                 {
594                                 ret= -1;
595                                 goto end;
596                                 }
597                         s->rwstate=SSL_NOTHING;
598                         s->state=s->s3->tmp.next_state;
599                         break;
600
601                 case SSL_ST_OK:
602                         /* clean a few things up */
603                         ssl3_cleanup_key_block(s);
604
605                         if (s->init_buf != NULL)
606                                 {
607                                 BUF_MEM_free(s->init_buf);
608                                 s->init_buf=NULL;
609                                 }
610
611                         /* If we are not 'joining' the last two packets,
612                          * remove the buffering now */
613                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
614                                 ssl_free_wbio_buffer(s);
615                         /* else do it later in ssl3_write */
616
617                         s->init_num=0;
618                         s->renegotiate=0;
619                         s->new_session=0;
620
621                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
622                         if (s->hit) s->ctx->stats.sess_hit++;
623
624                         ret=1;
625                         /* s->server=0; */
626                         s->handshake_func=ssl3_connect;
627                         s->ctx->stats.sess_connect_good++;
628
629                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
630
631                         goto end;
632                         /* break; */
633                         
634                 default:
635                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
636                         ret= -1;
637                         goto end;
638                         /* break; */
639                         }
640
641                 /* did we do anything */
642                 if (!s->s3->tmp.reuse_message && !skip)
643                         {
644                         if (s->debug)
645                                 {
646                                 if ((ret=BIO_flush(s->wbio)) <= 0)
647                                         goto end;
648                                 }
649
650                         if ((cb != NULL) && (s->state != state))
651                                 {
652                                 new_state=s->state;
653                                 s->state=state;
654                                 cb(s,SSL_CB_CONNECT_LOOP,1);
655                                 s->state=new_state;
656                                 }
657                         }
658                 skip=0;
659                 }
660 end:
661         s->in_handshake--;
662         if (buf != NULL)
663                 BUF_MEM_free(buf);
664         if (cb != NULL)
665                 cb(s,SSL_CB_CONNECT_EXIT,ret);
666         return(ret);
667         }
668
669
670 int ssl3_client_hello(SSL *s)
671         {
672         unsigned char *buf;
673         unsigned char *p,*d;
674         int i;
675         unsigned long Time,l;
676 #ifndef OPENSSL_NO_COMP
677         int j;
678         SSL_COMP *comp;
679 #endif
680
681         buf=(unsigned char *)s->init_buf->data;
682         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
683                 {
684                 SSL_SESSION *sess = s->session;
685                 if ((sess == NULL) ||
686                         (sess->ssl_version != s->version) ||
687 #ifdef OPENSSL_NO_TLSEXT
688                         !sess->session_id_length ||
689 #else
690                         (!sess->session_id_length && !sess->tlsext_tick) ||
691 #endif
692                         (sess->not_resumable))
693                         {
694                         if (!ssl_get_new_session(s,0))
695                                 goto err;
696                         }
697                 /* else use the pre-loaded session */
698
699                 p=s->s3->client_random;
700                 Time=(unsigned long)time(NULL);                 /* Time */
701                 l2n(Time,p);
702                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
703                         goto err;
704
705                 /* Do the message type and length last */
706                 d=p= &(buf[4]);
707
708                 /* version indicates the negotiated version: for example from
709                  * an SSLv2/v3 compatible client hello). The client_version
710                  * field is the maximum version we permit and it is also
711                  * used in RSA encrypted premaster secrets. Some servers can
712                  * choke if we initially report a higher version then
713                  * renegotiate to a lower one in the premaster secret. This
714                  * didn't happen with TLS 1.0 as most servers supported it
715                  * but it can with TLS 1.1 or later if the server only supports
716                  * 1.0.
717                  *
718                  * Possible scenario with previous logic:
719                  *      1. Client hello indicates TLS 1.2
720                  *      2. Server hello says TLS 1.0
721                  *      3. RSA encrypted premaster secret uses 1.2.
722                  *      4. Handhaked proceeds using TLS 1.0.
723                  *      5. Server sends hello request to renegotiate.
724                  *      6. Client hello indicates TLS v1.0 as we now
725                  *         know that is maximum server supports.
726                  *      7. Server chokes on RSA encrypted premaster secret
727                  *         containing version 1.0.
728                  *
729                  * For interoperability it should be OK to always use the
730                  * maximum version we support in client hello and then rely
731                  * on the checking of version to ensure the servers isn't
732                  * being inconsistent: for example initially negotiating with
733                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
734                  * client_version in client hello and not resetting it to
735                  * the negotiated version.
736                  */
737 #if 0
738                 *(p++)=s->version>>8;
739                 *(p++)=s->version&0xff;
740                 s->client_version=s->version;
741 #else
742                 *(p++)=s->client_version>>8;
743                 *(p++)=s->client_version&0xff;
744 #endif
745
746                 /* Random stuff */
747                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
748                 p+=SSL3_RANDOM_SIZE;
749
750                 /* Session ID */
751                 if (s->new_session)
752                         i=0;
753                 else
754                         i=s->session->session_id_length;
755                 *(p++)=i;
756                 if (i != 0)
757                         {
758                         if (i > (int)sizeof(s->session->session_id))
759                                 {
760                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
761                                 goto err;
762                                 }
763                         memcpy(p,s->session->session_id,i);
764                         p+=i;
765                         }
766                 
767                 /* Ciphers supported */
768                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
769                 if (i == 0)
770                         {
771                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
772                         goto err;
773                         }
774 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
775                         /* Some servers hang if client hello > 256 bytes
776                          * as hack workaround chop number of supported ciphers
777                          * to keep it well below this if we use TLS v1.2
778                          */
779                         if (TLS1_get_version(s) >= TLS1_2_VERSION
780                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
781                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
782 #endif
783                 s2n(i,p);
784                 p+=i;
785
786                 /* COMPRESSION */
787 #ifdef OPENSSL_NO_COMP
788                 *(p++)=1;
789 #else
790
791                 if ((s->options & SSL_OP_NO_COMPRESSION)
792                                         || !s->ctx->comp_methods)
793                         j=0;
794                 else
795                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
796                 *(p++)=1+j;
797                 for (i=0; i<j; i++)
798                         {
799                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
800                         *(p++)=comp->id;
801                         }
802 #endif
803                 *(p++)=0; /* Add the NULL method */
804
805 #ifndef OPENSSL_NO_TLSEXT
806                 /* TLS extensions*/
807                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
808                         {
809                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
810                         goto err;
811                         }
812                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
813                         {
814                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
815                         goto err;
816                         }
817 #endif
818                 
819                 l=(p-d);
820                 d=buf;
821                 *(d++)=SSL3_MT_CLIENT_HELLO;
822                 l2n3(l,d);
823
824                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
825                 /* number of bytes to write */
826                 s->init_num=p-buf;
827                 s->init_off=0;
828                 }
829
830         /* SSL3_ST_CW_CLNT_HELLO_B */
831         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
832 err:
833         return(-1);
834         }
835
836 int ssl3_get_server_hello(SSL *s)
837         {
838         STACK_OF(SSL_CIPHER) *sk;
839         const SSL_CIPHER *c;
840         CERT *ct = s->cert;
841         unsigned char *p,*d;
842         int i,al=SSL_AD_INTERNAL_ERROR,ok;
843         unsigned int j;
844         long n;
845 #ifndef OPENSSL_NO_COMP
846         SSL_COMP *comp;
847 #endif
848
849         n=s->method->ssl_get_message(s,
850                 SSL3_ST_CR_SRVR_HELLO_A,
851                 SSL3_ST_CR_SRVR_HELLO_B,
852                 -1,
853                 20000, /* ?? */
854                 &ok);
855
856         if (!ok) return((int)n);
857
858         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
859                 {
860                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
861                         {
862                         if ( s->d1->send_cookie == 0)
863                                 {
864                                 s->s3->tmp.reuse_message = 1;
865                                 return 1;
866                                 }
867                         else /* already sent a cookie */
868                                 {
869                                 al=SSL_AD_UNEXPECTED_MESSAGE;
870                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
871                                 goto f_err;
872                                 }
873                         }
874                 }
875         
876         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
877                 {
878                 al=SSL_AD_UNEXPECTED_MESSAGE;
879                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
880                 goto f_err;
881                 }
882
883         d=p=(unsigned char *)s->init_msg;
884
885         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
886                 {
887                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
888                 s->version=(s->version&0xff00)|p[1];
889                 al=SSL_AD_PROTOCOL_VERSION;
890                 goto f_err;
891                 }
892         p+=2;
893
894         /* load the server hello data */
895         /* load the server random */
896         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
897         p+=SSL3_RANDOM_SIZE;
898
899         /* get the session-id */
900         j= *(p++);
901
902         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
903                 {
904                 al=SSL_AD_ILLEGAL_PARAMETER;
905                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
906                 goto f_err;
907                 }
908
909 #ifndef OPENSSL_NO_TLSEXT
910         /* check if we want to resume the session based on external pre-shared secret */
911         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
912                 {
913                 SSL_CIPHER *pref_cipher=NULL;
914                 s->session->master_key_length=sizeof(s->session->master_key);
915                 if (s->tls_session_secret_cb(s, s->session->master_key,
916                                              &s->session->master_key_length,
917                                              NULL, &pref_cipher,
918                                              s->tls_session_secret_cb_arg))
919                         {
920                         s->session->cipher = pref_cipher ?
921                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
922                         }
923                 }
924 #endif /* OPENSSL_NO_TLSEXT */
925
926         if (j != 0 && j == s->session->session_id_length
927             && memcmp(p,s->session->session_id,j) == 0)
928             {
929             if(s->sid_ctx_length != s->session->sid_ctx_length
930                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
931                 {
932                 /* actually a client application bug */
933                 al=SSL_AD_ILLEGAL_PARAMETER;
934                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
935                 goto f_err;
936                 }
937             s->hit=1;
938             }
939         else    /* a miss or crap from the other end */
940                 {
941                 /* If we were trying for session-id reuse, make a new
942                  * SSL_SESSION so we don't stuff up other people */
943                 s->hit=0;
944                 if (s->session->session_id_length > 0)
945                         {
946                         if (!ssl_get_new_session(s,0))
947                                 {
948                                 goto f_err;
949                                 }
950                         }
951                 s->session->session_id_length=j;
952                 memcpy(s->session->session_id,p,j); /* j could be 0 */
953                 }
954         p+=j;
955         c=ssl_get_cipher_by_char(s,p);
956         if (c == NULL)
957                 {
958                 /* unknown cipher */
959                 al=SSL_AD_ILLEGAL_PARAMETER;
960                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
961                 goto f_err;
962                 }
963         /* If it is a disabled cipher we didn't send it in client hello,
964          * so return an error.
965          */
966         if (c->algorithm_ssl & ct->mask_ssl ||
967                 c->algorithm_mkey & ct->mask_k ||
968                 c->algorithm_auth & ct->mask_a)
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         p+=ssl_put_cipher_by_char(s,NULL,NULL);
975
976         sk=ssl_get_ciphers_by_id(s);
977         i=sk_SSL_CIPHER_find(sk,c);
978         if (i < 0)
979                 {
980                 /* we did not say we would use this cipher */
981                 al=SSL_AD_ILLEGAL_PARAMETER;
982                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
983                 goto f_err;
984                 }
985
986         /* Depending on the session caching (internal/external), the cipher
987            and/or cipher_id values may not be set. Make sure that
988            cipher_id is set and use it for comparison. */
989         if (s->session->cipher)
990                 s->session->cipher_id = s->session->cipher->id;
991         if (s->hit && (s->session->cipher_id != c->id))
992                 {
993 /* Workaround is now obsolete */
994 #if 0
995                 if (!(s->options &
996                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
997 #endif
998                         {
999                         al=SSL_AD_ILLEGAL_PARAMETER;
1000                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1001                         goto f_err;
1002                         }
1003                 }
1004         s->s3->tmp.new_cipher=c;
1005         /* Don't digest cached records if TLS v1.2: we may need them for
1006          * client authentication.
1007          */
1008         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
1009                 goto f_err;
1010         /* lets get the compression algorithm */
1011         /* COMPRESSION */
1012 #ifdef OPENSSL_NO_COMP
1013         if (*(p++) != 0)
1014                 {
1015                 al=SSL_AD_ILLEGAL_PARAMETER;
1016                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1017                 goto f_err;
1018                 }
1019         /* If compression is disabled we'd better not try to resume a session
1020          * using compression.
1021          */
1022         if (s->session->compress_meth != 0)
1023                 {
1024                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1025                 goto f_err;
1026                 }
1027 #else
1028         j= *(p++);
1029         if (s->hit && j != s->session->compress_meth)
1030                 {
1031                 al=SSL_AD_ILLEGAL_PARAMETER;
1032                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1033                 goto f_err;
1034                 }
1035         if (j == 0)
1036                 comp=NULL;
1037         else if (s->options & SSL_OP_NO_COMPRESSION)
1038                 {
1039                 al=SSL_AD_ILLEGAL_PARAMETER;
1040                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1041                 goto f_err;
1042                 }
1043         else
1044                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1045         
1046         if ((j != 0) && (comp == NULL))
1047                 {
1048                 al=SSL_AD_ILLEGAL_PARAMETER;
1049                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1050                 goto f_err;
1051                 }
1052         else
1053                 {
1054                 s->s3->tmp.new_compression=comp;
1055                 }
1056 #endif
1057
1058 #ifndef OPENSSL_NO_TLSEXT
1059         /* TLS extensions*/
1060         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1061                 {
1062                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1063                 goto err; 
1064                 }
1065 #endif
1066
1067         if (p != (d+n))
1068                 {
1069                 /* wrong packet length */
1070                 al=SSL_AD_DECODE_ERROR;
1071                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1072                 goto f_err;
1073                 }
1074
1075         return(1);
1076 f_err:
1077         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1078 err:
1079         return(-1);
1080         }
1081
1082 int ssl3_get_server_certificate(SSL *s)
1083         {
1084         int al,i,ok,ret= -1;
1085         unsigned long n,nc,llen,l;
1086         X509 *x=NULL;
1087         const unsigned char *q,*p;
1088         unsigned char *d;
1089         STACK_OF(X509) *sk=NULL;
1090         SESS_CERT *sc;
1091         EVP_PKEY *pkey=NULL;
1092         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1093
1094         n=s->method->ssl_get_message(s,
1095                 SSL3_ST_CR_CERT_A,
1096                 SSL3_ST_CR_CERT_B,
1097                 -1,
1098                 s->max_cert_list,
1099                 &ok);
1100
1101         if (!ok) return((int)n);
1102
1103         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1104                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 
1105                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1106                 {
1107                 s->s3->tmp.reuse_message=1;
1108                 return(1);
1109                 }
1110
1111         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1112                 {
1113                 al=SSL_AD_UNEXPECTED_MESSAGE;
1114                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1115                 goto f_err;
1116                 }
1117         p=d=(unsigned char *)s->init_msg;
1118
1119         if ((sk=sk_X509_new_null()) == NULL)
1120                 {
1121                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1122                 goto err;
1123                 }
1124
1125         n2l3(p,llen);
1126         if (llen+3 != n)
1127                 {
1128                 al=SSL_AD_DECODE_ERROR;
1129                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1130                 goto f_err;
1131                 }
1132         for (nc=0; nc<llen; )
1133                 {
1134                 n2l3(p,l);
1135                 if ((l+nc+3) > llen)
1136                         {
1137                         al=SSL_AD_DECODE_ERROR;
1138                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1139                         goto f_err;
1140                         }
1141
1142                 q=p;
1143                 x=d2i_X509(NULL,&q,l);
1144                 if (x == NULL)
1145                         {
1146                         al=SSL_AD_BAD_CERTIFICATE;
1147                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1148                         goto f_err;
1149                         }
1150                 if (q != (p+l))
1151                         {
1152                         al=SSL_AD_DECODE_ERROR;
1153                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1154                         goto f_err;
1155                         }
1156                 if (!sk_X509_push(sk,x))
1157                         {
1158                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1159                         goto err;
1160                         }
1161                 x=NULL;
1162                 nc+=l+3;
1163                 p=q;
1164                 }
1165
1166         i=ssl_verify_cert_chain(s,sk);
1167         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1168 #ifndef OPENSSL_NO_KRB5
1169             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1170                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1171 #endif /* OPENSSL_NO_KRB5 */
1172                 )
1173                 {
1174                 al=ssl_verify_alarm_type(s->verify_result);
1175                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1176                 goto f_err; 
1177                 }
1178         ERR_clear_error(); /* but we keep s->verify_result */
1179
1180         sc=ssl_sess_cert_new();
1181         if (sc == NULL) goto err;
1182
1183         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1184         s->session->sess_cert=sc;
1185
1186         sc->cert_chain=sk;
1187         /* Inconsistency alert: cert_chain does include the peer's
1188          * certificate, which we don't include in s3_srvr.c */
1189         x=sk_X509_value(sk,0);
1190         sk=NULL;
1191         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1192
1193         pkey=X509_get_pubkey(x);
1194
1195         /* VRS: allow null cert if auth == KRB5 */
1196         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1197                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1198                     ? 0 : 1;
1199
1200 #ifdef KSSL_DEBUG
1201         printf("pkey,x = %p, %p\n", pkey,x);
1202         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1203         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1204                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1205 #endif    /* KSSL_DEBUG */
1206
1207         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1208                 {
1209                 x=NULL;
1210                 al=SSL3_AL_FATAL;
1211                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1212                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1213                 goto f_err;
1214                 }
1215
1216         i=ssl_cert_type(x,pkey);
1217         if (need_cert && i < 0)
1218                 {
1219                 x=NULL;
1220                 al=SSL3_AL_FATAL;
1221                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1222                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1223                 goto f_err;
1224                 }
1225
1226         if (need_cert)
1227                 {
1228                 sc->peer_cert_type=i;
1229                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1230                 /* Why would the following ever happen?
1231                  * We just created sc a couple of lines ago. */
1232                 if (sc->peer_pkeys[i].x509 != NULL)
1233                         X509_free(sc->peer_pkeys[i].x509);
1234                 sc->peer_pkeys[i].x509=x;
1235                 sc->peer_key= &(sc->peer_pkeys[i]);
1236
1237                 if (s->session->peer != NULL)
1238                         X509_free(s->session->peer);
1239                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1240                 s->session->peer=x;
1241                 }
1242         else
1243                 {
1244                 sc->peer_cert_type=i;
1245                 sc->peer_key= NULL;
1246
1247                 if (s->session->peer != NULL)
1248                         X509_free(s->session->peer);
1249                 s->session->peer=NULL;
1250                 }
1251         s->session->verify_result = s->verify_result;
1252
1253         x=NULL;
1254 #ifndef OPENSSL_NO_TLSEXT
1255         /* Check the audit proof. */
1256         if (s->ctx->tlsext_authz_server_audit_proof_cb)
1257                 {
1258                 ret = s->ctx->tlsext_authz_server_audit_proof_cb(s,
1259                         s->ctx->tlsext_authz_server_audit_proof_cb_arg);
1260                 if (ret <= 0)
1261                         {
1262                         al = SSL_AD_BAD_CERTIFICATE;
1263                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_INVALID_AUDIT_PROOF);
1264                         goto f_err;
1265                         }
1266                 }
1267
1268 #endif
1269         ret=1;
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,i,j,param_len,ok;
1290         long 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         param_len=0;
1367         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1368         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1369         EVP_MD_CTX_init(&md_ctx);
1370
1371 #ifndef OPENSSL_NO_PSK
1372         if (alg_k & SSL_kPSK)
1373                 {
1374                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1375
1376                 al=SSL_AD_HANDSHAKE_FAILURE;
1377                 n2s(p,i);
1378                 param_len=i+2;
1379                 /* Store PSK identity hint for later use, hint is used
1380                  * in ssl3_send_client_key_exchange.  Assume that the
1381                  * maximum length of a PSK identity hint can be as
1382                  * long as the maximum length of a PSK identity. */
1383                 if (i > PSK_MAX_IDENTITY_LEN)
1384                         {
1385                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1386                                 SSL_R_DATA_LENGTH_TOO_LONG);
1387                         goto f_err;
1388                         }
1389                 if (param_len > n)
1390                         {
1391                         al=SSL_AD_DECODE_ERROR;
1392                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1393                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1394                         goto f_err;
1395                         }
1396                 /* If received PSK identity hint contains NULL
1397                  * characters, the hint is truncated from the first
1398                  * NULL. p may not be ending with NULL, so create a
1399                  * NULL-terminated string. */
1400                 memcpy(tmp_id_hint, p, i);
1401                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1402                 if (s->ctx->psk_identity_hint != NULL)
1403                         OPENSSL_free(s->ctx->psk_identity_hint);
1404                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1405                 if (s->ctx->psk_identity_hint == NULL)
1406                         {
1407                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1408                         goto f_err;
1409                         }          
1410
1411                 p+=i;
1412                 n-=param_len;
1413                 }
1414         else
1415 #endif /* !OPENSSL_NO_PSK */
1416 #ifndef OPENSSL_NO_SRP
1417         if (alg_k & SSL_kSRP)
1418                 {
1419                 n2s(p,i);
1420                 param_len=i+2;
1421                 if (param_len > n)
1422                         {
1423                         al=SSL_AD_DECODE_ERROR;
1424                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1425                         goto f_err;
1426                         }
1427                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1428                         {
1429                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1430                         goto err;
1431                         }
1432                 p+=i;
1433
1434                 n2s(p,i);
1435                 param_len+=i+2;
1436                 if (param_len > n)
1437                         {
1438                         al=SSL_AD_DECODE_ERROR;
1439                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1440                         goto f_err;
1441                         }
1442                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1443                         {
1444                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1445                         goto err;
1446                         }
1447                 p+=i;
1448
1449                 i = (unsigned int)(p[0]);
1450                 p++;
1451                 param_len+=i+1;
1452                 if (param_len > n)
1453                         {
1454                         al=SSL_AD_DECODE_ERROR;
1455                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1456                         goto f_err;
1457                         }
1458                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1459                         {
1460                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1461                         goto err;
1462                         }
1463                 p+=i;
1464
1465                 n2s(p,i);
1466                 param_len+=i+2;
1467                 if (param_len > n)
1468                         {
1469                         al=SSL_AD_DECODE_ERROR;
1470                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1471                         goto f_err;
1472                         }
1473                 if (!(s->srp_ctx.B=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                 n-=param_len;
1480
1481 /* We must check if there is a certificate */
1482 #ifndef OPENSSL_NO_RSA
1483                 if (alg_a & SSL_aRSA)
1484                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1485 #else
1486                 if (0)
1487                         ;
1488 #endif
1489 #ifndef OPENSSL_NO_DSA
1490                 else if (alg_a & SSL_aDSS)
1491                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1492 #endif
1493                 }
1494         else
1495 #endif /* !OPENSSL_NO_SRP */
1496 #ifndef OPENSSL_NO_RSA
1497         if (alg_k & SSL_kRSA)
1498                 {
1499                 if ((rsa=RSA_new()) == NULL)
1500                         {
1501                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1502                         goto err;
1503                         }
1504                 n2s(p,i);
1505                 param_len=i+2;
1506                 if (param_len > n)
1507                         {
1508                         al=SSL_AD_DECODE_ERROR;
1509                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1510                         goto f_err;
1511                         }
1512                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1513                         {
1514                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1515                         goto err;
1516                         }
1517                 p+=i;
1518
1519                 n2s(p,i);
1520                 param_len+=i+2;
1521                 if (param_len > n)
1522                         {
1523                         al=SSL_AD_DECODE_ERROR;
1524                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1525                         goto f_err;
1526                         }
1527                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1528                         {
1529                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1530                         goto err;
1531                         }
1532                 p+=i;
1533                 n-=param_len;
1534
1535                 /* this should be because we are using an export cipher */
1536                 if (alg_a & SSL_aRSA)
1537                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1538                 else
1539                         {
1540                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1541                         goto err;
1542                         }
1543                 s->session->sess_cert->peer_rsa_tmp=rsa;
1544                 rsa=NULL;
1545                 }
1546 #else /* OPENSSL_NO_RSA */
1547         if (0)
1548                 ;
1549 #endif
1550 #ifndef OPENSSL_NO_DH
1551         else if (alg_k & SSL_kEDH)
1552                 {
1553                 if ((dh=DH_new()) == NULL)
1554                         {
1555                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1556                         goto err;
1557                         }
1558                 n2s(p,i);
1559                 param_len=i+2;
1560                 if (param_len > n)
1561                         {
1562                         al=SSL_AD_DECODE_ERROR;
1563                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1564                         goto f_err;
1565                         }
1566                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1567                         {
1568                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1569                         goto err;
1570                         }
1571                 p+=i;
1572
1573                 n2s(p,i);
1574                 param_len+=i+2;
1575                 if (param_len > n)
1576                         {
1577                         al=SSL_AD_DECODE_ERROR;
1578                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1579                         goto f_err;
1580                         }
1581                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1582                         {
1583                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1584                         goto err;
1585                         }
1586                 p+=i;
1587
1588                 n2s(p,i);
1589                 param_len+=i+2;
1590                 if (param_len > n)
1591                         {
1592                         al=SSL_AD_DECODE_ERROR;
1593                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1594                         goto f_err;
1595                         }
1596                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1597                         {
1598                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1599                         goto err;
1600                         }
1601                 p+=i;
1602                 n-=param_len;
1603
1604 #ifndef OPENSSL_NO_RSA
1605                 if (alg_a & SSL_aRSA)
1606                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1607 #else
1608                 if (0)
1609                         ;
1610 #endif
1611 #ifndef OPENSSL_NO_DSA
1612                 else if (alg_a & SSL_aDSS)
1613                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1614 #endif
1615                 /* else anonymous DH, so no certificate or pkey. */
1616
1617                 s->session->sess_cert->peer_dh_tmp=dh;
1618                 dh=NULL;
1619                 }
1620         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1621                 {
1622                 al=SSL_AD_ILLEGAL_PARAMETER;
1623                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1624                 goto f_err;
1625                 }
1626 #endif /* !OPENSSL_NO_DH */
1627
1628 #ifndef OPENSSL_NO_ECDH
1629         else if (alg_k & SSL_kEECDH)
1630                 {
1631                 EC_GROUP *ngroup;
1632                 const EC_GROUP *group;
1633
1634                 if ((ecdh=EC_KEY_new()) == NULL)
1635                         {
1636                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1637                         goto err;
1638                         }
1639
1640                 /* Extract elliptic curve parameters and the
1641                  * server's ephemeral ECDH public key.
1642                  * Keep accumulating lengths of various components in
1643                  * param_len and make sure it never exceeds n.
1644                  */
1645
1646                 /* XXX: For now we only support named (not generic) curves
1647                  * and the ECParameters in this case is just three bytes.
1648                  */
1649                 param_len=3;
1650                 if ((param_len > n) ||
1651                     (*p != NAMED_CURVE_TYPE) || 
1652                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)) 
1653                         {
1654                         al=SSL_AD_INTERNAL_ERROR;
1655                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1656                         goto f_err;
1657                         }
1658
1659                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1660                 if (ngroup == NULL)
1661                         {
1662                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1663                         goto err;
1664                         }
1665                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1666                         {
1667                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1668                         goto err;
1669                         }
1670                 EC_GROUP_free(ngroup);
1671
1672                 group = EC_KEY_get0_group(ecdh);
1673
1674                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1675                     (EC_GROUP_get_degree(group) > 163))
1676                         {
1677                         al=SSL_AD_EXPORT_RESTRICTION;
1678                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1679                         goto f_err;
1680                         }
1681
1682                 p+=3;
1683
1684                 /* Next, get the encoded ECPoint */
1685                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1686                     ((bn_ctx = BN_CTX_new()) == NULL))
1687                         {
1688                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1689                         goto err;
1690                         }
1691
1692                 encoded_pt_len = *p;  /* length of encoded point */
1693                 p+=1;
1694                 param_len += (1 + encoded_pt_len);
1695                 if ((param_len > n) ||
1696                     (EC_POINT_oct2point(group, srvr_ecpoint, 
1697                         p, encoded_pt_len, bn_ctx) == 0))
1698                         {
1699                         al=SSL_AD_DECODE_ERROR;
1700                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1701                         goto f_err;
1702                         }
1703
1704                 n-=param_len;
1705                 p+=encoded_pt_len;
1706
1707                 /* The ECC/TLS specification does not mention
1708                  * the use of DSA to sign ECParameters in the server
1709                  * key exchange message. We do support RSA and ECDSA.
1710                  */
1711                 if (0) ;
1712 #ifndef OPENSSL_NO_RSA
1713                 else if (alg_a & SSL_aRSA)
1714                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1715 #endif
1716 #ifndef OPENSSL_NO_ECDSA
1717                 else if (alg_a & SSL_aECDSA)
1718                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1719 #endif
1720                 /* else anonymous ECDH, so no certificate or pkey. */
1721                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1722                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1723                 ecdh=NULL;
1724                 BN_CTX_free(bn_ctx);
1725                 bn_ctx = NULL;
1726                 EC_POINT_free(srvr_ecpoint);
1727                 srvr_ecpoint = NULL;
1728                 }
1729         else if (alg_k)
1730                 {
1731                 al=SSL_AD_UNEXPECTED_MESSAGE;
1732                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1733                 goto f_err;
1734                 }
1735 #endif /* !OPENSSL_NO_ECDH */
1736
1737
1738         /* p points to the next byte, there are 'n' bytes left */
1739
1740         /* if it was signed, check the signature */
1741         if (pkey != NULL)
1742                 {
1743                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1744                         {
1745                         int sigalg = tls12_get_sigid(pkey);
1746                         /* Should never happen */
1747                         if (sigalg == -1)
1748                                 {
1749                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1750                                 goto err;
1751                                 }
1752                         /* Check key type is consistent with signature */
1753                         if (sigalg != (int)p[1])
1754                                 {
1755                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1756                                 al=SSL_AD_DECODE_ERROR;
1757                                 goto f_err;
1758                                 }
1759                         md = tls12_get_hash(p[0]);
1760                         if (md == NULL)
1761                                 {
1762                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1763                                 al=SSL_AD_DECODE_ERROR;
1764                                 goto f_err;
1765                                 }
1766 #ifdef SSL_DEBUG
1767 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1768 #endif
1769                         p += 2;
1770                         n -= 2;
1771                         }
1772                 else
1773                         md = EVP_sha1();
1774                         
1775                 n2s(p,i);
1776                 n-=2;
1777                 j=EVP_PKEY_size(pkey);
1778
1779                 if ((i != n) || (n > j) || (n <= 0))
1780                         {
1781                         /* wrong packet length */
1782                         al=SSL_AD_DECODE_ERROR;
1783                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1784                         goto f_err;
1785                         }
1786
1787 #ifndef OPENSSL_NO_RSA
1788                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1789                         {
1790                         int num;
1791
1792                         j=0;
1793                         q=md_buf;
1794                         for (num=2; num > 0; num--)
1795                                 {
1796                                 EVP_MD_CTX_set_flags(&md_ctx,
1797                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1798                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1799                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1800                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1801                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1802                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1803                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1804                                 q+=i;
1805                                 j+=i;
1806                                 }
1807                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1808                                                                 pkey->pkey.rsa);
1809                         if (i < 0)
1810                                 {
1811                                 al=SSL_AD_DECRYPT_ERROR;
1812                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1813                                 goto f_err;
1814                                 }
1815                         if (i == 0)
1816                                 {
1817                                 /* bad signature */
1818                                 al=SSL_AD_DECRYPT_ERROR;
1819                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1820                                 goto f_err;
1821                                 }
1822                         }
1823                 else
1824 #endif
1825                         {
1826                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1827                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1828                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1829                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1830                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1831                                 {
1832                                 /* bad signature */
1833                                 al=SSL_AD_DECRYPT_ERROR;
1834                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1835                                 goto f_err;
1836                                 }
1837                         }
1838                 }
1839         else
1840                 {
1841                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1842                         /* aNULL or kPSK do not need public keys */
1843                         {
1844                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1845                         goto err;
1846                         }
1847                 /* still data left over */
1848                 if (n != 0)
1849                         {
1850                         al=SSL_AD_DECODE_ERROR;
1851                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1852                         goto f_err;
1853                         }
1854                 }
1855         EVP_PKEY_free(pkey);
1856         EVP_MD_CTX_cleanup(&md_ctx);
1857         return(1);
1858 f_err:
1859         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1860 err:
1861         EVP_PKEY_free(pkey);
1862 #ifndef OPENSSL_NO_RSA
1863         if (rsa != NULL)
1864                 RSA_free(rsa);
1865 #endif
1866 #ifndef OPENSSL_NO_DH
1867         if (dh != NULL)
1868                 DH_free(dh);
1869 #endif
1870 #ifndef OPENSSL_NO_ECDH
1871         BN_CTX_free(bn_ctx);
1872         EC_POINT_free(srvr_ecpoint);
1873         if (ecdh != NULL)
1874                 EC_KEY_free(ecdh);
1875 #endif
1876         EVP_MD_CTX_cleanup(&md_ctx);
1877         return(-1);
1878         }
1879
1880 int ssl3_get_certificate_request(SSL *s)
1881         {
1882         int ok,ret=0;
1883         unsigned long n,nc,l;
1884         unsigned int llen, ctype_num,i;
1885         X509_NAME *xn=NULL;
1886         const unsigned char *p,*q;
1887         unsigned char *d;
1888         STACK_OF(X509_NAME) *ca_sk=NULL;
1889
1890         n=s->method->ssl_get_message(s,
1891                 SSL3_ST_CR_CERT_REQ_A,
1892                 SSL3_ST_CR_CERT_REQ_B,
1893                 -1,
1894                 s->max_cert_list,
1895                 &ok);
1896
1897         if (!ok) return((int)n);
1898
1899         s->s3->tmp.cert_req=0;
1900
1901         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1902                 {
1903                 s->s3->tmp.reuse_message=1;
1904                 /* If we get here we don't need any cached handshake records
1905                  * as we wont be doing client auth.
1906                  */
1907                 if (s->s3->handshake_buffer)
1908                         {
1909                         if (!ssl3_digest_cached_records(s))
1910                                 goto err;
1911                         }
1912                 return(1);
1913                 }
1914
1915         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1916                 {
1917                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1918                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1919                 goto err;
1920                 }
1921
1922         /* TLS does not like anon-DH with client cert */
1923         if (s->version > SSL3_VERSION)
1924                 {
1925                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1926                         {
1927                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1928                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1929                         goto err;
1930                         }
1931                 }
1932
1933         p=d=(unsigned char *)s->init_msg;
1934
1935         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1936                 {
1937                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1938                 goto err;
1939                 }
1940
1941         /* get the certificate types */
1942         ctype_num= *(p++);
1943         if (s->cert->ctypes)
1944                 {
1945                 OPENSSL_free(s->cert->ctypes);
1946                 s->cert->ctypes = NULL;
1947                 }
1948         if (ctype_num > SSL3_CT_NUMBER)
1949                 {
1950                 /* If we exceed static buffer copy all to cert structure */
1951                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
1952                 memcpy(s->cert->ctypes, p, ctype_num);
1953                 s->cert->ctype_num = (size_t)ctype_num;
1954                 ctype_num=SSL3_CT_NUMBER;
1955                 }
1956         for (i=0; i<ctype_num; i++)
1957                 s->s3->tmp.ctype[i]= p[i];
1958         p+=p[-1];
1959         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1960                 {
1961                 n2s(p, llen);
1962                 /* Check we have enough room for signature algorithms and
1963                  * following length value.
1964                  */
1965                 if ((unsigned long)(p - d + llen + 2) > n)
1966                         {
1967                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1968                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1969                         goto err;
1970                         }
1971                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1972                         {
1973                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1974                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1975                         goto err;
1976                         }
1977                 p += llen;
1978                 }
1979
1980         /* get the CA RDNs */
1981         n2s(p,llen);
1982 #if 0
1983 {
1984 FILE *out;
1985 out=fopen("/tmp/vsign.der","w");
1986 fwrite(p,1,llen,out);
1987 fclose(out);
1988 }
1989 #endif
1990
1991         if ((unsigned long)(p - d + llen) != n)
1992                 {
1993                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1994                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1995                 goto err;
1996                 }
1997
1998         for (nc=0; nc<llen; )
1999                 {
2000                 n2s(p,l);
2001                 if ((l+nc+2) > llen)
2002                         {
2003                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2004                                 goto cont; /* netscape bugs */
2005                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2006                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2007                         goto err;
2008                         }
2009
2010                 q=p;
2011
2012                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2013                         {
2014                         /* If netscape tolerance is on, ignore errors */
2015                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2016                                 goto cont;
2017                         else
2018                                 {
2019                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2020                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2021                                 goto err;
2022                                 }
2023                         }
2024
2025                 if (q != (p+l))
2026                         {
2027                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2028                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2029                         goto err;
2030                         }
2031                 if (!sk_X509_NAME_push(ca_sk,xn))
2032                         {
2033                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2034                         goto err;
2035                         }
2036
2037                 p+=l;
2038                 nc+=l+2;
2039                 }
2040
2041         if (0)
2042                 {
2043 cont:
2044                 ERR_clear_error();
2045                 }
2046
2047         /* we should setup a certificate to return.... */
2048         s->s3->tmp.cert_req=1;
2049         s->s3->tmp.ctype_num=ctype_num;
2050         if (s->s3->tmp.ca_names != NULL)
2051                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2052         s->s3->tmp.ca_names=ca_sk;
2053         ca_sk=NULL;
2054
2055         ret=1;
2056 err:
2057         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2058         return(ret);
2059         }
2060
2061 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2062         {
2063         return(X509_NAME_cmp(*a,*b));
2064         }
2065 #ifndef OPENSSL_NO_TLSEXT
2066 int ssl3_get_new_session_ticket(SSL *s)
2067         {
2068         int ok,al,ret=0, ticklen;
2069         long n;
2070         const unsigned char *p;
2071         unsigned char *d;
2072
2073         n=s->method->ssl_get_message(s,
2074                 SSL3_ST_CR_SESSION_TICKET_A,
2075                 SSL3_ST_CR_SESSION_TICKET_B,
2076                 -1,
2077                 16384,
2078                 &ok);
2079
2080         if (!ok)
2081                 return((int)n);
2082
2083         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2084                 {
2085                 s->s3->tmp.reuse_message=1;
2086                 return(1);
2087                 }
2088         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2089                 {
2090                 al=SSL_AD_UNEXPECTED_MESSAGE;
2091                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2092                 goto f_err;
2093                 }
2094         if (n < 6)
2095                 {
2096                 /* need at least ticket_lifetime_hint + ticket length */
2097                 al = SSL_AD_DECODE_ERROR;
2098                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2099                 goto f_err;
2100                 }
2101
2102         p=d=(unsigned char *)s->init_msg;
2103         n2l(p, s->session->tlsext_tick_lifetime_hint);
2104         n2s(p, ticklen);
2105         /* ticket_lifetime_hint + ticket_length + ticket */
2106         if (ticklen + 6 != n)
2107                 {
2108                 al = SSL_AD_DECODE_ERROR;
2109                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2110                 goto f_err;
2111                 }
2112         if (s->session->tlsext_tick)
2113                 {
2114                 OPENSSL_free(s->session->tlsext_tick);
2115                 s->session->tlsext_ticklen = 0;
2116                 }
2117         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2118         if (!s->session->tlsext_tick)
2119                 {
2120                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2121                 goto err;
2122                 }
2123         memcpy(s->session->tlsext_tick, p, ticklen);
2124         s->session->tlsext_ticklen = ticklen;
2125         /* There are two ways to detect a resumed ticket sesion.
2126          * One is to set an appropriate session ID and then the server
2127          * must return a match in ServerHello. This allows the normal
2128          * client session ID matching to work and we know much 
2129          * earlier that the ticket has been accepted.
2130          * 
2131          * The other way is to set zero length session ID when the
2132          * ticket is presented and rely on the handshake to determine
2133          * session resumption.
2134          *
2135          * We choose the former approach because this fits in with
2136          * assumptions elsewhere in OpenSSL. The session ID is set
2137          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2138          * ticket.
2139          */ 
2140         EVP_Digest(p, ticklen,
2141                         s->session->session_id, &s->session->session_id_length,
2142 #ifndef OPENSSL_NO_SHA256
2143                                                         EVP_sha256(), NULL);
2144 #else
2145                                                         EVP_sha1(), NULL);
2146 #endif
2147         ret=1;
2148         return(ret);
2149 f_err:
2150         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2151 err:
2152         return(-1);
2153         }
2154
2155 int ssl3_get_cert_status(SSL *s)
2156         {
2157         int ok, al;
2158         unsigned long resplen,n;
2159         const unsigned char *p;
2160
2161         n=s->method->ssl_get_message(s,
2162                 SSL3_ST_CR_CERT_STATUS_A,
2163                 SSL3_ST_CR_CERT_STATUS_B,
2164                 SSL3_MT_CERTIFICATE_STATUS,
2165                 16384,
2166                 &ok);
2167
2168         if (!ok) return((int)n);
2169         if (n < 4)
2170                 {
2171                 /* need at least status type + length */
2172                 al = SSL_AD_DECODE_ERROR;
2173                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2174                 goto f_err;
2175                 }
2176         p = (unsigned char *)s->init_msg;
2177         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2178                 {
2179                 al = SSL_AD_DECODE_ERROR;
2180                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2181                 goto f_err;
2182                 }
2183         n2l3(p, resplen);
2184         if (resplen + 4 != n)
2185                 {
2186                 al = SSL_AD_DECODE_ERROR;
2187                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2188                 goto f_err;
2189                 }
2190         if (s->tlsext_ocsp_resp)
2191                 OPENSSL_free(s->tlsext_ocsp_resp);
2192         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2193         if (!s->tlsext_ocsp_resp)
2194                 {
2195                 al = SSL_AD_INTERNAL_ERROR;
2196                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2197                 goto f_err;
2198                 }
2199         s->tlsext_ocsp_resplen = resplen;
2200         if (s->ctx->tlsext_status_cb)
2201                 {
2202                 int ret;
2203                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2204                 if (ret == 0)
2205                         {
2206                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2207                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2208                         goto f_err;
2209                         }
2210                 if (ret < 0)
2211                         {
2212                         al = SSL_AD_INTERNAL_ERROR;
2213                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2214                         goto f_err;
2215                         }
2216                 }
2217         return 1;
2218 f_err:
2219         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2220         return(-1);
2221         }
2222 #endif
2223
2224 int ssl3_get_server_done(SSL *s)
2225         {
2226         int ok,ret=0;
2227         long n;
2228
2229         n=s->method->ssl_get_message(s,
2230                 SSL3_ST_CR_SRVR_DONE_A,
2231                 SSL3_ST_CR_SRVR_DONE_B,
2232                 SSL3_MT_SERVER_DONE,
2233                 30, /* should be very small, like 0 :-) */
2234                 &ok);
2235
2236         if (!ok) return((int)n);
2237         if (n > 0)
2238                 {
2239                 /* should contain no data */
2240                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2241                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2242                 return -1;
2243                 }
2244         ret=1;
2245         return(ret);
2246         }
2247
2248
2249 int ssl3_send_client_key_exchange(SSL *s)
2250         {
2251         unsigned char *p,*d;
2252         int n;
2253         unsigned long alg_k;
2254 #ifndef OPENSSL_NO_RSA
2255         unsigned char *q;
2256         EVP_PKEY *pkey=NULL;
2257 #endif
2258 #ifndef OPENSSL_NO_KRB5
2259         KSSL_ERR kssl_err;
2260 #endif /* OPENSSL_NO_KRB5 */
2261 #ifndef OPENSSL_NO_ECDH
2262         EC_KEY *clnt_ecdh = NULL;
2263         const EC_POINT *srvr_ecpoint = NULL;
2264         EVP_PKEY *srvr_pub_pkey = NULL;
2265         unsigned char *encodedPoint = NULL;
2266         int encoded_pt_len = 0;
2267         BN_CTX * bn_ctx = NULL;
2268 #endif
2269
2270         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2271                 {
2272                 d=(unsigned char *)s->init_buf->data;
2273                 p= &(d[4]);
2274
2275                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2276
2277                 /* Fool emacs indentation */
2278                 if (0) {}
2279 #ifndef OPENSSL_NO_RSA
2280                 else if (alg_k & SSL_kRSA)
2281                         {
2282                         RSA *rsa;
2283                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2284
2285                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2286                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2287                         else
2288                                 {
2289                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2290                                 if ((pkey == NULL) ||
2291                                         (pkey->type != EVP_PKEY_RSA) ||
2292                                         (pkey->pkey.rsa == NULL))
2293                                         {
2294                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2295                                         goto err;
2296                                         }
2297                                 rsa=pkey->pkey.rsa;
2298                                 EVP_PKEY_free(pkey);
2299                                 }
2300                                 
2301                         tmp_buf[0]=s->client_version>>8;
2302                         tmp_buf[1]=s->client_version&0xff;
2303                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2304                                         goto err;
2305
2306                         s->session->master_key_length=sizeof tmp_buf;
2307
2308                         q=p;
2309                         /* Fix buf for TLS and beyond */
2310                         if (s->version > SSL3_VERSION)
2311                                 p+=2;
2312                         n=RSA_public_encrypt(sizeof tmp_buf,
2313                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2314 #ifdef PKCS1_CHECK
2315                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2316                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2317 #endif
2318                         if (n <= 0)
2319                                 {
2320                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2321                                 goto err;
2322                                 }
2323
2324                         /* Fix buf for TLS and beyond */
2325                         if (s->version > SSL3_VERSION)
2326                                 {
2327                                 s2n(n,q);
2328                                 n+=2;
2329                                 }
2330
2331                         s->session->master_key_length=
2332                                 s->method->ssl3_enc->generate_master_secret(s,
2333                                         s->session->master_key,
2334                                         tmp_buf,sizeof tmp_buf);
2335                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2336                         }
2337 #endif
2338 #ifndef OPENSSL_NO_KRB5
2339                 else if (alg_k & SSL_kKRB5)
2340                         {
2341                         krb5_error_code krb5rc;
2342                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2343                         /*  krb5_data   krb5_ap_req;  */
2344                         krb5_data       *enc_ticket;
2345                         krb5_data       authenticator, *authp = NULL;
2346                         EVP_CIPHER_CTX  ciph_ctx;
2347                         const EVP_CIPHER *enc = NULL;
2348                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2349                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2350                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
2351                                                 + EVP_MAX_IV_LENGTH];
2352                         int             padl, outl = sizeof(epms);
2353
2354                         EVP_CIPHER_CTX_init(&ciph_ctx);
2355
2356 #ifdef KSSL_DEBUG
2357                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2358                                 alg_k, SSL_kKRB5);
2359 #endif  /* KSSL_DEBUG */
2360
2361                         authp = NULL;
2362 #ifdef KRB5SENDAUTH
2363                         if (KRB5SENDAUTH)  authp = &authenticator;
2364 #endif  /* KRB5SENDAUTH */
2365
2366                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2367                                 &kssl_err);
2368                         enc = kssl_map_enc(kssl_ctx->enctype);
2369                         if (enc == NULL)
2370                             goto err;
2371 #ifdef KSSL_DEBUG
2372                         {
2373                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2374                         if (krb5rc && kssl_err.text)
2375                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2376                         }
2377 #endif  /* KSSL_DEBUG */
2378
2379                         if (krb5rc)
2380                                 {
2381                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2382                                                 SSL_AD_HANDSHAKE_FAILURE);
2383                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2384                                                 kssl_err.reason);
2385                                 goto err;
2386                                 }
2387
2388                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2389                         **  in place of RFC 2712 KerberosWrapper, as in:
2390                         **
2391                         **  Send ticket (copy to *p, set n = length)
2392                         **  n = krb5_ap_req.length;
2393                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2394                         **  if (krb5_ap_req.data)  
2395                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2396                         **
2397                         **  Now using real RFC 2712 KerberosWrapper
2398                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2399                         **  Note: 2712 "opaque" types are here replaced
2400                         **  with a 2-byte length followed by the value.
2401                         **  Example:
2402                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2403                         **  Where "xx xx" = length bytes.  Shown here with
2404                         **  optional authenticator omitted.
2405                         */
2406
2407                         /*  KerberosWrapper.Ticket              */
2408                         s2n(enc_ticket->length,p);
2409                         memcpy(p, enc_ticket->data, enc_ticket->length);
2410                         p+= enc_ticket->length;
2411                         n = enc_ticket->length + 2;
2412
2413                         /*  KerberosWrapper.Authenticator       */
2414                         if (authp  &&  authp->length)  
2415                                 {
2416                                 s2n(authp->length,p);
2417                                 memcpy(p, authp->data, authp->length);
2418                                 p+= authp->length;
2419                                 n+= authp->length + 2;
2420                                 
2421                                 free(authp->data);
2422                                 authp->data = NULL;
2423                                 authp->length = 0;
2424                                 }
2425                         else
2426                                 {
2427                                 s2n(0,p);/*  null authenticator length  */
2428                                 n+=2;
2429                                 }
2430  
2431                             tmp_buf[0]=s->client_version>>8;
2432                             tmp_buf[1]=s->client_version&0xff;
2433                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2434                                 goto err;
2435
2436                         /*  20010420 VRS.  Tried it this way; failed.
2437                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2438                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2439                         **                              kssl_ctx->length);
2440                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2441                         */
2442
2443                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2444                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2445                                 kssl_ctx->key,iv);
2446                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2447                                 sizeof tmp_buf);
2448                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2449                         outl += padl;
2450                         if (outl > (int)sizeof epms)
2451                                 {
2452                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2453                                 goto err;
2454                                 }
2455                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2456
2457                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2458                         s2n(outl,p);
2459                         memcpy(p, epms, outl);
2460                         p+=outl;
2461                         n+=outl + 2;
2462
2463                         s->session->master_key_length=
2464                                 s->method->ssl3_enc->generate_master_secret(s,
2465                                         s->session->master_key,
2466                                         tmp_buf, sizeof tmp_buf);
2467
2468                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2469                         OPENSSL_cleanse(epms, outl);
2470                         }
2471 #endif
2472 #ifndef OPENSSL_NO_DH
2473                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2474                         {
2475                         DH *dh_srvr,*dh_clnt;
2476                         SESS_CERT *scert = s->session->sess_cert;
2477
2478                         if (scert == NULL) 
2479                                 {
2480                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2481                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2482                                 goto err;
2483                                 }
2484
2485                         if (scert->peer_dh_tmp != NULL)
2486                                 dh_srvr=scert->peer_dh_tmp;
2487                         else
2488                                 {
2489                                 /* we get them from the cert */
2490                                 int idx = scert->peer_cert_type;
2491                                 EVP_PKEY *spkey = NULL;
2492                                 dh_srvr = NULL;
2493                                 if (idx >= 0)
2494                                         spkey = X509_get_pubkey(
2495                                                 scert->peer_pkeys[idx].x509);
2496                                 if (spkey)
2497                                         {
2498                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2499                                         EVP_PKEY_free(spkey);
2500                                         }
2501                                 if (dh_srvr == NULL)
2502                                         {
2503                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2504                                             ERR_R_INTERNAL_ERROR);
2505                                         goto err;
2506                                         }
2507                                 }
2508                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2509                                 {
2510                                 /* Use client certificate key */
2511                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2512                                 dh_clnt = NULL;
2513                                 if (clkey)
2514                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2515                                 if (dh_clnt == NULL)
2516                                         {
2517                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2518                                             ERR_R_INTERNAL_ERROR);
2519                                         goto err;
2520                                         }
2521                                 }
2522                         else
2523                                 {
2524                                 /* generate a new random key */
2525                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2526                                         {
2527                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2528                                         goto err;
2529                                         }
2530                                 if (!DH_generate_key(dh_clnt))
2531                                         {
2532                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2533                                         DH_free(dh_clnt);
2534                                         goto err;
2535                                         }
2536                                 }
2537
2538                         /* use the 'p' output buffer for the DH key, but
2539                          * make sure to clear it out afterwards */
2540
2541                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2542                         if (scert->peer_dh_tmp == NULL)
2543                                 DH_free(dh_srvr);
2544
2545                         if (n <= 0)
2546                                 {
2547                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2548                                 DH_free(dh_clnt);
2549                                 goto err;
2550                                 }
2551
2552                         /* generate master key from the result */
2553                         s->session->master_key_length=
2554                                 s->method->ssl3_enc->generate_master_secret(s,
2555                                         s->session->master_key,p,n);
2556                         /* clean up */
2557                         memset(p,0,n);
2558
2559                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2560                                 n = 0;
2561                         else
2562                                 {
2563                                 /* send off the data */
2564                                 n=BN_num_bytes(dh_clnt->pub_key);
2565                                 s2n(n,p);
2566                                 BN_bn2bin(dh_clnt->pub_key,p);
2567                                 n+=2;
2568                                 }
2569
2570                         DH_free(dh_clnt);
2571
2572                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2573                         }
2574 #endif
2575
2576 #ifndef OPENSSL_NO_ECDH 
2577                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2578                         {
2579                         const EC_GROUP *srvr_group = NULL;
2580                         EC_KEY *tkey;
2581                         int ecdh_clnt_cert = 0;
2582                         int field_size = 0;
2583
2584                         /* Did we send out the client's
2585                          * ECDH share for use in premaster
2586                          * computation as part of client certificate?
2587                          * If so, set ecdh_clnt_cert to 1.
2588                          */
2589                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
2590                                 {
2591                                 /* XXX: For now, we do not support client
2592                                  * authentication using ECDH certificates.
2593                                  * To add such support, one needs to add
2594                                  * code that checks for appropriate 
2595                                  * conditions and sets ecdh_clnt_cert to 1.
2596                                  * For example, the cert have an ECC
2597                                  * key on the same curve as the server's
2598                                  * and the key should be authorized for
2599                                  * key agreement.
2600                                  *
2601                                  * One also needs to add code in ssl3_connect
2602                                  * to skip sending the certificate verify
2603                                  * message.
2604                                  *
2605                                  * if ((s->cert->key->privatekey != NULL) &&
2606                                  *     (s->cert->key->privatekey->type ==
2607                                  *      EVP_PKEY_EC) && ...)
2608                                  * ecdh_clnt_cert = 1;
2609                                  */
2610                                 }
2611
2612                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2613                                 {
2614                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2615                                 }
2616                         else
2617                                 {
2618                                 /* Get the Server Public Key from Cert */
2619                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2620                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2621                                 if ((srvr_pub_pkey == NULL) ||
2622                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2623                                     (srvr_pub_pkey->pkey.ec == NULL))
2624                                         {
2625                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2626                                             ERR_R_INTERNAL_ERROR);
2627                                         goto err;
2628                                         }
2629
2630                                 tkey = srvr_pub_pkey->pkey.ec;
2631                                 }
2632
2633                         srvr_group   = EC_KEY_get0_group(tkey);
2634                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2635
2636                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2637                                 {
2638                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2639                                     ERR_R_INTERNAL_ERROR);
2640                                 goto err;
2641                                 }
2642
2643                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
2644                                 {
2645                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2646                                 goto err;
2647                                 }
2648
2649                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2650                                 {
2651                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2652                                 goto err;
2653                                 }
2654                         if (ecdh_clnt_cert) 
2655                                 { 
2656                                 /* Reuse key info from our certificate
2657                                  * We only need our private key to perform
2658                                  * the ECDH computation.
2659                                  */
2660                                 const BIGNUM *priv_key;
2661                                 tkey = s->cert->key->privatekey->pkey.ec;
2662                                 priv_key = EC_KEY_get0_private_key(tkey);
2663                                 if (priv_key == NULL)
2664                                         {
2665                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2666                                         goto err;
2667                                         }
2668                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2669                                         {
2670                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2671                                         goto err;
2672                                         }
2673                                 }
2674                         else 
2675                                 {
2676                                 /* Generate a new ECDH key pair */
2677                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2678                                         {
2679                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2680                                         goto err;
2681                                         }
2682                                 }
2683
2684                         /* use the 'p' output buffer for the ECDH key, but
2685                          * make sure to clear it out afterwards
2686                          */
2687
2688                         field_size = EC_GROUP_get_degree(srvr_group);
2689                         if (field_size <= 0)
2690                                 {
2691                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2692                                        ERR_R_ECDH_LIB);
2693                                 goto err;
2694                                 }
2695                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2696                         if (n <= 0)
2697                                 {
2698                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2699                                        ERR_R_ECDH_LIB);
2700                                 goto err;
2701                                 }
2702
2703                         /* generate master key from the result */
2704                         s->session->master_key_length = s->method->ssl3_enc \
2705                             -> generate_master_secret(s, 
2706                                 s->session->master_key,
2707                                 p, n);
2708
2709                         memset(p, 0, n); /* clean up */
2710
2711                         if (ecdh_clnt_cert) 
2712                                 {
2713                                 /* Send empty client key exch message */
2714                                 n = 0;
2715                                 }
2716                         else 
2717                                 {
2718                                 /* First check the size of encoding and
2719                                  * allocate memory accordingly.
2720                                  */
2721                                 encoded_pt_len = 
2722                                     EC_POINT_point2oct(srvr_group, 
2723                                         EC_KEY_get0_public_key(clnt_ecdh), 
2724                                         POINT_CONVERSION_UNCOMPRESSED, 
2725                                         NULL, 0, NULL);
2726
2727                                 encodedPoint = (unsigned char *) 
2728                                     OPENSSL_malloc(encoded_pt_len * 
2729                                         sizeof(unsigned char)); 
2730                                 bn_ctx = BN_CTX_new();
2731                                 if ((encodedPoint == NULL) || 
2732                                     (bn_ctx == NULL)) 
2733                                         {
2734                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2735                                         goto err;
2736                                         }
2737
2738                                 /* Encode the public key */
2739                                 n = EC_POINT_point2oct(srvr_group, 
2740                                     EC_KEY_get0_public_key(clnt_ecdh), 
2741                                     POINT_CONVERSION_UNCOMPRESSED, 
2742                                     encodedPoint, encoded_pt_len, bn_ctx);
2743
2744                                 *p = n; /* length of encoded point */
2745                                 /* Encoded point will be copied here */
2746                                 p += 1; 
2747                                 /* copy the point */
2748                                 memcpy((unsigned char *)p, encodedPoint, n);
2749                                 /* increment n to account for length field */
2750                                 n += 1; 
2751                                 }
2752
2753                         /* Free allocated memory */
2754                         BN_CTX_free(bn_ctx);
2755                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2756                         if (clnt_ecdh != NULL) 
2757                                  EC_KEY_free(clnt_ecdh);
2758                         EVP_PKEY_free(srvr_pub_pkey);
2759                         }
2760 #endif /* !OPENSSL_NO_ECDH */
2761                 else if (alg_k & SSL_kGOST) 
2762                         {
2763                         /* GOST key exchange message creation */
2764                         EVP_PKEY_CTX *pkey_ctx;
2765                         X509 *peer_cert; 
2766                         size_t msglen;
2767                         unsigned int md_len;
2768                         int keytype;
2769                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2770                         EVP_MD_CTX *ukm_hash;
2771                         EVP_PKEY *pub_key;
2772
2773                         /* Get server sertificate PKEY and create ctx from it */
2774                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2775                         if (!peer_cert) 
2776                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2777                         if (!peer_cert)         {
2778                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2779                                         goto err;
2780                                 }       
2781                                 
2782                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2783                         /* If we have send a certificate, and certificate key
2784
2785                          * parameters match those of server certificate, use
2786                          * certificate key for key exchange
2787                          */
2788
2789                          /* Otherwise, generate ephemeral key pair */
2790                                         
2791                         EVP_PKEY_encrypt_init(pkey_ctx);
2792                           /* Generate session key */    
2793                     RAND_bytes(premaster_secret,32);
2794                         /* If we have client certificate, use its secret as peer key */
2795                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2796                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2797                                         /* If there was an error - just ignore it. Ephemeral key
2798                                         * would be used
2799                                         */
2800                                         ERR_clear_error();
2801                                 }
2802                         }                       
2803                         /* Compute shared IV and store it in algorithm-specific
2804                          * context data */
2805                         ukm_hash = EVP_MD_CTX_create();
2806                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2807                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2808                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2809                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2810                         EVP_MD_CTX_destroy(ukm_hash);
2811                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2812                                 8,shared_ukm)<0) {
2813                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2814                                                 SSL_R_LIBRARY_BUG);
2815                                         goto err;
2816                                 }       
2817                         /* Make GOST keytransport blob message */
2818                         /*Encapsulate it into sequence */
2819                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2820                         msglen=255;
2821                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2822                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2823                                         SSL_R_LIBRARY_BUG);
2824                                 goto err;
2825                         }
2826                         if (msglen >= 0x80)
2827                                 {
2828                                 *(p++)=0x81;
2829                                 *(p++)= msglen & 0xff;
2830                                 n=msglen+3;
2831                                 }
2832                         else
2833                                 {
2834                                 *(p++)= msglen & 0xff;
2835                                 n=msglen+2;
2836                                 }
2837                         memcpy(p, tmp, msglen);
2838                         /* Check if pubkey from client certificate was used */
2839                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2840                                 {
2841                                 /* Set flag "skip certificate verify" */
2842                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2843                                 }
2844                         EVP_PKEY_CTX_free(pkey_ctx);
2845                         s->session->master_key_length=
2846                                 s->method->ssl3_enc->generate_master_secret(s,
2847                                         s->session->master_key,premaster_secret,32);
2848                         EVP_PKEY_free(pub_key);
2849
2850                         }
2851 #ifndef OPENSSL_NO_SRP
2852                 else if (alg_k & SSL_kSRP)
2853                         {
2854                         if (s->srp_ctx.A != NULL)
2855                                 {
2856                                 /* send off the data */
2857                                 n=BN_num_bytes(s->srp_ctx.A);
2858                                 s2n(n,p);
2859                                 BN_bn2bin(s->srp_ctx.A,p);
2860                                 n+=2;
2861                                 }
2862                         else
2863                                 {
2864                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2865                                 goto err;
2866                                 }
2867                         if (s->session->srp_username != NULL)
2868                                 OPENSSL_free(s->session->srp_username);
2869                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2870                         if (s->session->srp_username == NULL)
2871                                 {
2872                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2873                                         ERR_R_MALLOC_FAILURE);
2874                                 goto err;
2875                                 }
2876
2877                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2878                                 {
2879                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2880                                 goto err;
2881                                 }
2882                         }
2883 #endif
2884 #ifndef OPENSSL_NO_PSK
2885                 else if (alg_k & SSL_kPSK)
2886                         {
2887                         char identity[PSK_MAX_IDENTITY_LEN];
2888                         unsigned char *t = NULL;
2889                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2890                         unsigned int pre_ms_len = 0, psk_len = 0;
2891                         int psk_err = 1;
2892
2893                         n = 0;
2894                         if (s->psk_client_callback == NULL)
2895                                 {
2896                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2897                                         SSL_R_PSK_NO_CLIENT_CB);
2898                                 goto err;
2899                                 }
2900
2901                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2902                                 identity, PSK_MAX_IDENTITY_LEN,
2903                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2904                         if (psk_len > PSK_MAX_PSK_LEN)
2905                                 {
2906                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2907                                         ERR_R_INTERNAL_ERROR);
2908                                 goto psk_err;
2909                                 }
2910                         else if (psk_len == 0)
2911                                 {
2912                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2913                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2914                                 goto psk_err;
2915                                 }
2916
2917                         /* create PSK pre_master_secret */
2918                         pre_ms_len = 2+psk_len+2+psk_len;
2919                         t = psk_or_pre_ms;
2920                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2921                         s2n(psk_len, t);
2922                         memset(t, 0, psk_len);
2923                         t+=psk_len;
2924                         s2n(psk_len, t);
2925
2926                         if (s->session->psk_identity_hint != NULL)
2927                                 OPENSSL_free(s->session->psk_identity_hint);
2928                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2929                         if (s->ctx->psk_identity_hint != NULL &&
2930                                 s->session->psk_identity_hint == NULL)
2931                                 {
2932                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2933                                         ERR_R_MALLOC_FAILURE);
2934                                 goto psk_err;
2935                                 }
2936
2937                         if (s->session->psk_identity != NULL)
2938                                 OPENSSL_free(s->session->psk_identity);
2939                         s->session->psk_identity = BUF_strdup(identity);
2940                         if (s->session->psk_identity == NULL)
2941                                 {
2942                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2943                                         ERR_R_MALLOC_FAILURE);
2944                                 goto psk_err;
2945                                 }
2946
2947                         s->session->master_key_length =
2948                                 s->method->ssl3_enc->generate_master_secret(s,
2949                                         s->session->master_key,
2950                                         psk_or_pre_ms, pre_ms_len); 
2951                         n = strlen(identity);
2952                         s2n(n, p);
2953                         memcpy(p, identity, n);
2954                         n+=2;
2955                         psk_err = 0;
2956                 psk_err:
2957                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2958                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2959                         if (psk_err != 0)
2960                                 {
2961                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2962                                 goto err;
2963                                 }
2964                         }
2965 #endif
2966                 else
2967                         {
2968                         ssl3_send_alert(s, SSL3_AL_FATAL,
2969                             SSL_AD_HANDSHAKE_FAILURE);
2970                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2971                             ERR_R_INTERNAL_ERROR);
2972                         goto err;
2973                         }
2974                 
2975                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2976                 l2n3(n,d);
2977
2978                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2979                 /* number of bytes to write */
2980                 s->init_num=n+4;
2981                 s->init_off=0;
2982                 }
2983
2984         /* SSL3_ST_CW_KEY_EXCH_B */
2985         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2986 err:
2987 #ifndef OPENSSL_NO_ECDH
2988         BN_CTX_free(bn_ctx);
2989         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2990         if (clnt_ecdh != NULL) 
2991                 EC_KEY_free(clnt_ecdh);
2992         EVP_PKEY_free(srvr_pub_pkey);
2993 #endif
2994         return(-1);
2995         }
2996
2997 int ssl3_send_client_verify(SSL *s)
2998         {
2999         unsigned char *p,*d;
3000         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3001         EVP_PKEY *pkey;
3002         EVP_PKEY_CTX *pctx=NULL;
3003         EVP_MD_CTX mctx;
3004         unsigned u=0;
3005         unsigned long n;
3006         int j;
3007
3008         EVP_MD_CTX_init(&mctx);
3009
3010         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3011                 {
3012                 d=(unsigned char *)s->init_buf->data;
3013                 p= &(d[4]);
3014                 pkey=s->cert->key->privatekey;
3015 /* Create context from key and test if sha1 is allowed as digest */
3016                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3017                 EVP_PKEY_sign_init(pctx);
3018                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3019                         {
3020                         if (TLS1_get_version(s) < TLS1_2_VERSION)
3021                                 s->method->ssl3_enc->cert_verify_mac(s,
3022                                                 NID_sha1,
3023                                                 &(data[MD5_DIGEST_LENGTH]));
3024                         }
3025                 else
3026                         {
3027                         ERR_clear_error();
3028                         }
3029                 /* For TLS v1.2 send signature algorithm and signature
3030