Call OCSP Stapling callback after ciphersuite has been chosen, so the
[openssl.git] / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
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 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include "ssl_locl.h"
156 #include "kssl_lcl.h"
157 #include <openssl/buffer.h>
158 #include <openssl/rand.h>
159 #include <openssl/objects.h>
160 #include <openssl/evp.h>
161 #include <openssl/hmac.h>
162 #include <openssl/x509.h>
163 #ifndef OPENSSL_NO_DH
164 #include <openssl/dh.h>
165 #endif
166 #include <openssl/bn.h>
167 #ifndef OPENSSL_NO_KRB5
168 #include <openssl/krb5_asn.h>
169 #endif
170 #include <openssl/md5.h>
171
172 static const SSL_METHOD *ssl3_get_server_method(int ver);
173
174 static const SSL_METHOD *ssl3_get_server_method(int ver)
175         {
176         if (ver == SSL3_VERSION)
177                 return(SSLv3_server_method());
178         else
179                 return(NULL);
180         }
181
182 #ifndef OPENSSL_NO_SRP
183 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
184         {
185         int ret = SSL_ERROR_NONE;
186
187         *al = SSL_AD_UNRECOGNIZED_NAME;
188
189         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
190             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
191                 {
192                 if(s->srp_ctx.login == NULL)
193                         {
194                         /* RFC 5054 says SHOULD reject, 
195                            we do so if There is no srp login name */
196                         ret = SSL3_AL_FATAL;
197                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
198                         }
199                 else
200                         {
201                         ret = SSL_srp_server_param_with_username(s,al);
202                         }
203                 }
204         return ret;
205         }
206 #endif
207
208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
209                         ssl3_accept,
210                         ssl_undefined_function,
211                         ssl3_get_server_method)
212
213 int ssl3_accept(SSL *s)
214         {
215         BUF_MEM *buf;
216         unsigned long alg_k,Time=(unsigned long)time(NULL);
217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
218         int ret= -1;
219         int new_state,state,skip=0;
220
221         RAND_add(&Time,sizeof(Time),0);
222         ERR_clear_error();
223         clear_sys_error();
224
225         if (s->info_callback != NULL)
226                 cb=s->info_callback;
227         else if (s->ctx->info_callback != NULL)
228                 cb=s->ctx->info_callback;
229
230         /* init things to blank */
231         s->in_handshake++;
232         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
233
234         if (s->cert == NULL)
235                 {
236                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
237                 return(-1);
238                 }
239
240 #ifndef OPENSSL_NO_HEARTBEATS
241         /* If we're awaiting a HeartbeatResponse, pretend we
242          * already got and don't await it anymore, because
243          * Heartbeats don't make sense during handshakes anyway.
244          */
245         if (s->tlsext_hb_pending)
246                 {
247                 s->tlsext_hb_pending = 0;
248                 s->tlsext_hb_seq++;
249                 }
250 #endif
251
252         for (;;)
253                 {
254                 state=s->state;
255
256                 switch (s->state)
257                         {
258                 case SSL_ST_RENEGOTIATE:
259                         s->renegotiate=1;
260                         /* s->state=SSL_ST_ACCEPT; */
261
262                 case SSL_ST_BEFORE:
263                 case SSL_ST_ACCEPT:
264                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
265                 case SSL_ST_OK|SSL_ST_ACCEPT:
266
267                         s->server=1;
268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
269
270                         if ((s->version>>8) != 3)
271                                 {
272                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
273                                 return -1;
274                                 }
275                         s->type=SSL_ST_ACCEPT;
276
277                         if (s->init_buf == NULL)
278                                 {
279                                 if ((buf=BUF_MEM_new()) == NULL)
280                                         {
281                                         ret= -1;
282                                         goto end;
283                                         }
284                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
285                                         {
286                                         ret= -1;
287                                         goto end;
288                                         }
289                                 s->init_buf=buf;
290                                 }
291
292                         if (!ssl3_setup_buffers(s))
293                                 {
294                                 ret= -1;
295                                 goto end;
296                                 }
297
298                         s->init_num=0;
299                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
300                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
301
302                         if (s->state != SSL_ST_RENEGOTIATE)
303                                 {
304                                 /* Ok, we now need to push on a buffering BIO so that
305                                  * the output is sent in a way that TCP likes :-)
306                                  */
307                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
308                                 
309                                 ssl3_init_finished_mac(s);
310                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
311                                 s->ctx->stats.sess_accept++;
312                                 }
313                         else if (!s->s3->send_connection_binding &&
314                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
315                                 {
316                                 /* Server attempting to renegotiate with
317                                  * client that doesn't support secure
318                                  * renegotiation.
319                                  */
320                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
321                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
322                                 ret = -1;
323                                 goto end;
324                                 }
325                         else
326                                 {
327                                 /* s->state == SSL_ST_RENEGOTIATE,
328                                  * we will just send a HelloRequest */
329                                 s->ctx->stats.sess_accept_renegotiate++;
330                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
331                                 }
332                         break;
333
334                 case SSL3_ST_SW_HELLO_REQ_A:
335                 case SSL3_ST_SW_HELLO_REQ_B:
336
337                         s->shutdown=0;
338                         ret=ssl3_send_hello_request(s);
339                         if (ret <= 0) goto end;
340                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
341                         s->state=SSL3_ST_SW_FLUSH;
342                         s->init_num=0;
343
344                         ssl3_init_finished_mac(s);
345                         break;
346
347                 case SSL3_ST_SW_HELLO_REQ_C:
348                         s->state=SSL_ST_OK;
349                         break;
350
351                 case SSL3_ST_SR_CLNT_HELLO_A:
352                 case SSL3_ST_SR_CLNT_HELLO_B:
353                 case SSL3_ST_SR_CLNT_HELLO_C:
354
355                         if (s->rwstate != SSL_X509_LOOKUP)
356                         {
357                                 ret=ssl3_get_client_hello(s);
358                                 if (ret <= 0) goto end;
359                         }
360 #ifndef OPENSSL_NO_SRP
361                         {
362                         int al;
363                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
364                                         {
365                                         /* callback indicates firther work to be done */
366                                         s->rwstate=SSL_X509_LOOKUP;
367                                         goto end;
368                                         }
369                         if (ret != SSL_ERROR_NONE)
370                                 {
371                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);    
372                                 /* This is not really an error but the only means to
373                                    for a client to detect whether srp is supported. */
374                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)      
375                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);                     
376                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;                       
377                                 ret= -1;
378                                 goto end;       
379                                 }
380                         }
381 #endif          
382                         
383                         s->renegotiate = 2;
384                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
385                         s->init_num=0;
386                         break;
387
388                 case SSL3_ST_SW_SRVR_HELLO_A:
389                 case SSL3_ST_SW_SRVR_HELLO_B:
390                         ret=ssl3_send_server_hello(s);
391                         if (ret <= 0) goto end;
392 #ifndef OPENSSL_NO_TLSEXT
393                         if (s->hit)
394                                 {
395                                 if (s->tlsext_ticket_expected)
396                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
397                                 else
398                                         s->state=SSL3_ST_SW_CHANGE_A;
399                                 }
400 #else
401                         if (s->hit)
402                                         s->state=SSL3_ST_SW_CHANGE_A;
403 #endif
404                         else
405 #ifndef OPENSSL_NO_TLSEXT
406                                 s->state = SSL3_ST_SW_SUPPLEMENTAL_DATA_A;
407 #else
408                         s->state = SSL3_ST_SW_CERT_A;
409 #endif
410                         s->init_num = 0;
411                         break;
412
413 #ifndef OPENSSL_NO_TLSEXT
414                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_A:
415                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_B:
416                         /* We promised to send an audit proof in the hello. */
417                         if (s->s3->tlsext_authz_promised_to_client)
418                                 {
419                                 ret = tls1_send_server_supplemental_data(s);
420                                 if (ret <= 0) goto end;
421                                 }
422                         else
423                                 skip = 1;
424
425                         s->state = SSL3_ST_SW_CERT_A;
426                         s->init_num = 0;
427                         break;
428 #endif
429
430                 case SSL3_ST_SW_CERT_A:
431                 case SSL3_ST_SW_CERT_B:
432                         /* Check if it is anon DH or anon ECDH, */
433                         /* normal PSK or KRB5 or SRP */
434                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
435                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
436                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
437                                 {
438                                 ret=ssl3_send_server_certificate(s);
439                                 if (ret <= 0) goto end;
440 #ifndef OPENSSL_NO_TLSEXT
441                                 if (s->tlsext_status_expected)
442                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
443                                 else
444                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
445                                 }
446                         else
447                                 {
448                                 skip = 1;
449                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
450                                 }
451 #else
452                                 }
453                         else
454                                 skip=1;
455
456                         s->state=SSL3_ST_SW_KEY_EXCH_A;
457 #endif
458                         s->init_num=0;
459                         break;
460
461                 case SSL3_ST_SW_KEY_EXCH_A:
462                 case SSL3_ST_SW_KEY_EXCH_B:
463                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
464
465                         /* clear this, it may get reset by
466                          * send_server_key_exchange */
467                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
468 #ifndef OPENSSL_NO_KRB5
469                                 && !(alg_k & SSL_kKRB5)
470 #endif /* OPENSSL_NO_KRB5 */
471                                 )
472                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
473                                  * even when forbidden by protocol specs
474                                  * (handshake may fail as clients are not required to
475                                  * be able to handle this) */
476                                 s->s3->tmp.use_rsa_tmp=1;
477                         else
478                                 s->s3->tmp.use_rsa_tmp=0;
479
480
481                         /* only send if a DH key exchange, fortezza or
482                          * RSA but we have a sign only certificate
483                          *
484                          * PSK: may send PSK identity hints
485                          *
486                          * For ECC ciphersuites, we send a serverKeyExchange
487                          * message only if the cipher suite is either
488                          * ECDH-anon or ECDHE. In other cases, the
489                          * server certificate contains the server's
490                          * public key for key exchange.
491                          */
492                         if (s->s3->tmp.use_rsa_tmp
493                         /* PSK: send ServerKeyExchange if PSK identity
494                          * hint if provided */
495 #ifndef OPENSSL_NO_PSK
496                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
497 #endif
498 #ifndef OPENSSL_NO_SRP
499                             /* SRP: send ServerKeyExchange */
500                             || (alg_k & SSL_kSRP)
501 #endif
502                             || (alg_k & SSL_kEDH)
503                             || (alg_k & SSL_kEECDH)
504                             || ((alg_k & SSL_kRSA)
505                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
506                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
507                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
508                                         )
509                                     )
510                                 )
511                             )
512                                 {
513                                 ret=ssl3_send_server_key_exchange(s);
514                                 if (ret <= 0) goto end;
515                                 }
516                         else
517                                 skip=1;
518
519                         s->state=SSL3_ST_SW_CERT_REQ_A;
520                         s->init_num=0;
521                         break;
522
523                 case SSL3_ST_SW_CERT_REQ_A:
524                 case SSL3_ST_SW_CERT_REQ_B:
525                         if (/* don't request cert unless asked for it: */
526                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
527                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
528                                  * don't request cert during re-negotiation: */
529                                 ((s->session->peer != NULL) &&
530                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
531                                 /* never request cert in anonymous ciphersuites
532                                  * (see section "Certificate request" in SSL 3 drafts
533                                  * and in RFC 2246): */
534                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
535                                  /* ... except when the application insists on verification
536                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
537                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
538                                  /* never request cert in Kerberos ciphersuites */
539                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
540                                 /* With normal PSK Certificates and
541                                  * Certificate Requests are omitted */
542                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
543                                 {
544                                 /* no cert request */
545                                 skip=1;
546                                 s->s3->tmp.cert_request=0;
547                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
548                                 if (s->s3->handshake_buffer)
549                                         if (!ssl3_digest_cached_records(s))
550                                                 return -1;
551                                 }
552                         else
553                                 {
554                                 s->s3->tmp.cert_request=1;
555                                 ret=ssl3_send_certificate_request(s);
556                                 if (ret <= 0) goto end;
557 #ifndef NETSCAPE_HANG_BUG
558                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
559 #else
560                                 s->state=SSL3_ST_SW_FLUSH;
561                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
562 #endif
563                                 s->init_num=0;
564                                 }
565                         break;
566
567                 case SSL3_ST_SW_SRVR_DONE_A:
568                 case SSL3_ST_SW_SRVR_DONE_B:
569                         ret=ssl3_send_server_done(s);
570                         if (ret <= 0) goto end;
571                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
572                         s->state=SSL3_ST_SW_FLUSH;
573                         s->init_num=0;
574                         break;
575                 
576                 case SSL3_ST_SW_FLUSH:
577
578                         /* This code originally checked to see if
579                          * any data was pending using BIO_CTRL_INFO
580                          * and then flushed. This caused problems
581                          * as documented in PR#1939. The proposed
582                          * fix doesn't completely resolve this issue
583                          * as buggy implementations of BIO_CTRL_PENDING
584                          * still exist. So instead we just flush
585                          * unconditionally.
586                          */
587
588                         s->rwstate=SSL_WRITING;
589                         if (BIO_flush(s->wbio) <= 0)
590                                 {
591                                 ret= -1;
592                                 goto end;
593                                 }
594                         s->rwstate=SSL_NOTHING;
595
596                         s->state=s->s3->tmp.next_state;
597                         break;
598
599                 case SSL3_ST_SR_CERT_A:
600                 case SSL3_ST_SR_CERT_B:
601                         /* Check for second client hello (MS SGC) */
602                         ret = ssl3_check_client_hello(s);
603                         if (ret <= 0)
604                                 goto end;
605                         if (ret == 2)
606                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
607                         else {
608                                 if (s->s3->tmp.cert_request)
609                                         {
610                                         ret=ssl3_get_client_certificate(s);
611                                         if (ret <= 0) goto end;
612                                         }
613                                 s->init_num=0;
614                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
615                         }
616                         break;
617
618                 case SSL3_ST_SR_KEY_EXCH_A:
619                 case SSL3_ST_SR_KEY_EXCH_B:
620                         ret=ssl3_get_client_key_exchange(s);
621                         if (ret <= 0)
622                                 goto end;
623                         if (ret == 2)
624                                 {
625                                 /* For the ECDH ciphersuites when
626                                  * the client sends its ECDH pub key in
627                                  * a certificate, the CertificateVerify
628                                  * message is not sent.
629                                  * Also for GOST ciphersuites when
630                                  * the client uses its key from the certificate
631                                  * for key exchange.
632                                  */
633 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
634                                 s->state=SSL3_ST_SR_FINISHED_A;
635 #else
636                                 if (s->s3->next_proto_neg_seen)
637                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
638                                 else
639                                         s->state=SSL3_ST_SR_FINISHED_A;
640 #endif
641                                 s->init_num = 0;
642                                 }
643                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
644                                 {
645                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
646                                 s->init_num=0;
647                                 if (!s->session->peer)
648                                         break;
649                                 /* For TLS v1.2 freeze the handshake buffer
650                                  * at this point and digest cached records.
651                                  */
652                                 if (!s->s3->handshake_buffer)
653                                         {
654                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
655                                         return -1;
656                                         }
657                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
658                                 if (!ssl3_digest_cached_records(s))
659                                         return -1;
660                                 }
661                         else
662                                 {
663                                 int offset=0;
664                                 int dgst_num;
665
666                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
667                                 s->init_num=0;
668
669                                 /* We need to get hashes here so if there is
670                                  * a client cert, it can be verified
671                                  * FIXME - digest processing for CertificateVerify
672                                  * should be generalized. But it is next step
673                                  */
674                                 if (s->s3->handshake_buffer)
675                                         if (!ssl3_digest_cached_records(s))
676                                                 return -1;
677                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
678                                         if (s->s3->handshake_dgst[dgst_num]) 
679                                                 {
680                                                 int dgst_size;
681
682                                                 s->method->ssl3_enc->cert_verify_mac(s,EVP_MD_CTX_type(s->s3->handshake_dgst[dgst_num]),&(s->s3->tmp.cert_verify_md[offset]));
683                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
684                                                 if (dgst_size < 0)
685                                                         {
686                                                         ret = -1;
687                                                         goto end;
688                                                         }
689                                                 offset+=dgst_size;
690                                                 }               
691                                 }
692                         break;
693
694                 case SSL3_ST_SR_CERT_VRFY_A:
695                 case SSL3_ST_SR_CERT_VRFY_B:
696
697                         /* we should decide if we expected this one */
698                         ret=ssl3_get_cert_verify(s);
699                         if (ret <= 0) goto end;
700
701 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
702                         s->state=SSL3_ST_SR_FINISHED_A;
703 #else
704                         if (s->s3->next_proto_neg_seen)
705                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
706                         else
707                                 s->state=SSL3_ST_SR_FINISHED_A;
708 #endif
709                         s->init_num=0;
710                         break;
711
712 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
713                 case SSL3_ST_SR_NEXT_PROTO_A:
714                 case SSL3_ST_SR_NEXT_PROTO_B:
715                         ret=ssl3_get_next_proto(s);
716                         if (ret <= 0) goto end;
717                         s->init_num = 0;
718                         s->state=SSL3_ST_SR_FINISHED_A;
719                         break;
720 #endif
721
722                 case SSL3_ST_SR_FINISHED_A:
723                 case SSL3_ST_SR_FINISHED_B:
724                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
725                                 SSL3_ST_SR_FINISHED_B);
726                         if (ret <= 0) goto end;
727                         if (s->hit)
728                                 s->state=SSL_ST_OK;
729 #ifndef OPENSSL_NO_TLSEXT
730                         else if (s->tlsext_ticket_expected)
731                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
732 #endif
733                         else
734                                 s->state=SSL3_ST_SW_CHANGE_A;
735                         s->init_num=0;
736                         break;
737
738 #ifndef OPENSSL_NO_TLSEXT
739                 case SSL3_ST_SW_SESSION_TICKET_A:
740                 case SSL3_ST_SW_SESSION_TICKET_B:
741                         ret=ssl3_send_newsession_ticket(s);
742                         if (ret <= 0) goto end;
743                         s->state=SSL3_ST_SW_CHANGE_A;
744                         s->init_num=0;
745                         break;
746
747                 case SSL3_ST_SW_CERT_STATUS_A:
748                 case SSL3_ST_SW_CERT_STATUS_B:
749                         ret=ssl3_send_cert_status(s);
750                         if (ret <= 0) goto end;
751                         s->state=SSL3_ST_SW_KEY_EXCH_A;
752                         s->init_num=0;
753                         break;
754
755 #endif
756
757                 case SSL3_ST_SW_CHANGE_A:
758                 case SSL3_ST_SW_CHANGE_B:
759
760                         s->session->cipher=s->s3->tmp.new_cipher;
761                         if (!s->method->ssl3_enc->setup_key_block(s))
762                                 { ret= -1; goto end; }
763
764                         ret=ssl3_send_change_cipher_spec(s,
765                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
766
767                         if (ret <= 0) goto end;
768                         s->state=SSL3_ST_SW_FINISHED_A;
769                         s->init_num=0;
770
771                         if (!s->method->ssl3_enc->change_cipher_state(s,
772                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
773                                 {
774                                 ret= -1;
775                                 goto end;
776                                 }
777
778                         break;
779
780                 case SSL3_ST_SW_FINISHED_A:
781                 case SSL3_ST_SW_FINISHED_B:
782                         ret=ssl3_send_finished(s,
783                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
784                                 s->method->ssl3_enc->server_finished_label,
785                                 s->method->ssl3_enc->server_finished_label_len);
786                         if (ret <= 0) goto end;
787                         s->state=SSL3_ST_SW_FLUSH;
788                         if (s->hit)
789                                 {
790 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
791                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
792 #else
793                                 if (s->s3->next_proto_neg_seen)
794                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
795                                 else
796                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
797 #endif
798                                 }
799                         else
800                                 s->s3->tmp.next_state=SSL_ST_OK;
801                         s->init_num=0;
802                         break;
803
804                 case SSL_ST_OK:
805                         /* clean a few things up */
806                         ssl3_cleanup_key_block(s);
807
808                         BUF_MEM_free(s->init_buf);
809                         s->init_buf=NULL;
810
811                         /* remove buffering on output */
812                         ssl_free_wbio_buffer(s);
813
814                         s->init_num=0;
815
816                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
817                                 {
818                                 s->renegotiate=0;
819                                 s->new_session=0;
820                                 
821                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
822                                 
823                                 s->ctx->stats.sess_accept_good++;
824                                 /* s->server=1; */
825                                 s->handshake_func=ssl3_accept;
826
827                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
828                                 }
829                         
830                         ret = 1;
831                         goto end;
832                         /* break; */
833
834                 default:
835                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
836                         ret= -1;
837                         goto end;
838                         /* break; */
839                         }
840                 
841                 if (!s->s3->tmp.reuse_message && !skip)
842                         {
843                         if (s->debug)
844                                 {
845                                 if ((ret=BIO_flush(s->wbio)) <= 0)
846                                         goto end;
847                                 }
848
849
850                         if ((cb != NULL) && (s->state != state))
851                                 {
852                                 new_state=s->state;
853                                 s->state=state;
854                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
855                                 s->state=new_state;
856                                 }
857                         }
858                 skip=0;
859                 }
860 end:
861         /* BIO_flush(s->wbio); */
862
863         s->in_handshake--;
864         if (cb != NULL)
865                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
866         return(ret);
867         }
868
869 int ssl3_send_hello_request(SSL *s)
870         {
871         unsigned char *p;
872
873         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
874                 {
875                 p=(unsigned char *)s->init_buf->data;
876                 *(p++)=SSL3_MT_HELLO_REQUEST;
877                 *(p++)=0;
878                 *(p++)=0;
879                 *(p++)=0;
880
881                 s->state=SSL3_ST_SW_HELLO_REQ_B;
882                 /* number of bytes to write */
883                 s->init_num=4;
884                 s->init_off=0;
885                 }
886
887         /* SSL3_ST_SW_HELLO_REQ_B */
888         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
889         }
890
891 int ssl3_check_client_hello(SSL *s)
892         {
893         int ok;
894         long n;
895
896         /* this function is called when we really expect a Certificate message,
897          * so permit appropriate message length */
898         n=s->method->ssl_get_message(s,
899                 SSL3_ST_SR_CERT_A,
900                 SSL3_ST_SR_CERT_B,
901                 -1,
902                 s->max_cert_list,
903                 &ok);
904         if (!ok) return((int)n);
905         s->s3->tmp.reuse_message = 1;
906         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
907                 {
908                 /* We only allow the client to restart the handshake once per
909                  * negotiation. */
910                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
911                         {
912                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
913                         return -1;
914                         }
915                 /* Throw away what we have done so far in the current handshake,
916                  * which will now be aborted. (A full SSL_clear would be too much.) */
917 #ifndef OPENSSL_NO_DH
918                 if (s->s3->tmp.dh != NULL)
919                         {
920                         DH_free(s->s3->tmp.dh);
921                         s->s3->tmp.dh = NULL;
922                         }
923 #endif
924 #ifndef OPENSSL_NO_ECDH
925                 if (s->s3->tmp.ecdh != NULL)
926                         {
927                         EC_KEY_free(s->s3->tmp.ecdh);
928                         s->s3->tmp.ecdh = NULL;
929                         }
930 #endif
931                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
932                 return 2;
933                 }
934         return 1;
935 }
936
937 int ssl3_get_client_hello(SSL *s)
938         {
939         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
940         unsigned int cookie_len;
941         long n;
942         unsigned long id;
943         unsigned char *p,*d,*q;
944         SSL_CIPHER *c;
945 #ifndef OPENSSL_NO_COMP
946         SSL_COMP *comp=NULL;
947 #endif
948         STACK_OF(SSL_CIPHER) *ciphers=NULL;
949
950         /* We do this so that we will respond with our native type.
951          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
952          * This down switching should be handled by a different method.
953          * If we are SSLv3, we will respond with SSLv3, even if prompted with
954          * TLSv1.
955          */
956         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
957                 )
958                 {
959                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
960                 }
961         s->first_packet=1;
962         n=s->method->ssl_get_message(s,
963                 SSL3_ST_SR_CLNT_HELLO_B,
964                 SSL3_ST_SR_CLNT_HELLO_C,
965                 SSL3_MT_CLIENT_HELLO,
966                 SSL3_RT_MAX_PLAIN_LENGTH,
967                 &ok);
968
969         if (!ok) return((int)n);
970         s->first_packet=0;
971         d=p=(unsigned char *)s->init_msg;
972
973         /* use version from inside client hello, not from record header
974          * (may differ: see RFC 2246, Appendix E, second paragraph) */
975         s->client_version=(((int)p[0])<<8)|(int)p[1];
976         p+=2;
977
978         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
979             (s->version != DTLS1_VERSION && s->client_version < s->version))
980                 {
981                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
982                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
983                         {
984                         /* similar to ssl3_get_record, send alert using remote version number */
985                         s->version = s->client_version;
986                         }
987                 al = SSL_AD_PROTOCOL_VERSION;
988                 goto f_err;
989                 }
990
991         /* If we require cookies and this ClientHello doesn't
992          * contain one, just return since we do not want to
993          * allocate any memory yet. So check cookie length...
994          */
995         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
996                 {
997                 unsigned int session_length, cookie_length;
998                 
999                 session_length = *(p + SSL3_RANDOM_SIZE);
1000                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
1001
1002                 if (cookie_length == 0)
1003                         return 1;
1004                 }
1005
1006         /* load the client random */
1007         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1008         p+=SSL3_RANDOM_SIZE;
1009
1010         /* get the session-id */
1011         j= *(p++);
1012
1013         s->hit=0;
1014         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1015          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1016          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1017          * than a change to default behavior so that applications relying on this for security
1018          * won't even compile against older library versions).
1019          *
1020          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1021          * renegotiation but not a new session (s->new_session remains unset): for servers,
1022          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1023          * setting will be ignored.
1024          */
1025         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1026                 {
1027                 if (!ssl_get_new_session(s,1))
1028                         goto err;
1029                 }
1030         else
1031                 {
1032                 i=ssl_get_prev_session(s, p, j, d + n);
1033                 if (i == 1)
1034                         { /* previous session */
1035                         s->hit=1;
1036                         }
1037                 else if (i == -1)
1038                         goto err;
1039                 else /* i == 0 */
1040                         {
1041                         if (!ssl_get_new_session(s,1))
1042                                 goto err;
1043                         }
1044                 }
1045
1046         p+=j;
1047
1048         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1049                 {
1050                 /* cookie stuff */
1051                 cookie_len = *(p++);
1052
1053                 /* 
1054                  * The ClientHello may contain a cookie even if the
1055                  * HelloVerify message has not been sent--make sure that it
1056                  * does not cause an overflow.
1057                  */
1058                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1059                         {
1060                         /* too much data */
1061                         al = SSL_AD_DECODE_ERROR;
1062                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1063                         goto f_err;
1064                         }
1065
1066                 /* verify the cookie if appropriate option is set. */
1067                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1068                         cookie_len > 0)
1069                         {
1070                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1071
1072                         if ( s->ctx->app_verify_cookie_cb != NULL)
1073                                 {
1074                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1075                                         cookie_len) == 0)
1076                                         {
1077                                         al=SSL_AD_HANDSHAKE_FAILURE;
1078                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1079                                                 SSL_R_COOKIE_MISMATCH);
1080                                         goto f_err;
1081                                         }
1082                                 /* else cookie verification succeeded */
1083                                 }
1084                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1085                                                   s->d1->cookie_len) != 0) /* default verification */
1086                                 {
1087                                         al=SSL_AD_HANDSHAKE_FAILURE;
1088                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1089                                                 SSL_R_COOKIE_MISMATCH);
1090                                         goto f_err;
1091                                 }
1092
1093                         ret = 2;
1094                         }
1095
1096                 p += cookie_len;
1097                 }
1098
1099         n2s(p,i);
1100         if ((i == 0) && (j != 0))
1101                 {
1102                 /* we need a cipher if we are not resuming a session */
1103                 al=SSL_AD_ILLEGAL_PARAMETER;
1104                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1105                 goto f_err;
1106                 }
1107         if ((p+i) >= (d+n))
1108                 {
1109                 /* not enough data */
1110                 al=SSL_AD_DECODE_ERROR;
1111                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1112                 goto f_err;
1113                 }
1114         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1115                 == NULL))
1116                 {
1117                 goto err;
1118                 }
1119         p+=i;
1120
1121         /* If it is a hit, check that the cipher is in the list */
1122         if ((s->hit) && (i > 0))
1123                 {
1124                 j=0;
1125                 id=s->session->cipher->id;
1126
1127 #ifdef CIPHER_DEBUG
1128                 printf("client sent %d ciphers\n",sk_num(ciphers));
1129 #endif
1130                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1131                         {
1132                         c=sk_SSL_CIPHER_value(ciphers,i);
1133 #ifdef CIPHER_DEBUG
1134                         printf("client [%2d of %2d]:%s\n",
1135                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1136 #endif
1137                         if (c->id == id)
1138                                 {
1139                                 j=1;
1140                                 break;
1141                                 }
1142                         }
1143 /* Disabled because it can be used in a ciphersuite downgrade
1144  * attack: CVE-2010-4180.
1145  */
1146 #if 0
1147                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1148                         {
1149                         /* Special case as client bug workaround: the previously used cipher may
1150                          * not be in the current list, the client instead might be trying to
1151                          * continue using a cipher that before wasn't chosen due to server
1152                          * preferences.  We'll have to reject the connection if the cipher is not
1153                          * enabled, though. */
1154                         c = sk_SSL_CIPHER_value(ciphers, 0);
1155                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1156                                 {
1157                                 s->session->cipher = c;
1158                                 j = 1;
1159                                 }
1160                         }
1161 #endif
1162                 if (j == 0)
1163                         {
1164                         /* we need to have the cipher in the cipher
1165                          * list if we are asked to reuse it */
1166                         al=SSL_AD_ILLEGAL_PARAMETER;
1167                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1168                         goto f_err;
1169                         }
1170                 }
1171
1172         /* compression */
1173         i= *(p++);
1174         if ((p+i) > (d+n))
1175                 {
1176                 /* not enough data */
1177                 al=SSL_AD_DECODE_ERROR;
1178                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1179                 goto f_err;
1180                 }
1181         q=p;
1182         for (j=0; j<i; j++)
1183                 {
1184                 if (p[j] == 0) break;
1185                 }
1186
1187         p+=i;
1188         if (j >= i)
1189                 {
1190                 /* no compress */
1191                 al=SSL_AD_DECODE_ERROR;
1192                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1193                 goto f_err;
1194                 }
1195
1196 #ifndef OPENSSL_NO_TLSEXT
1197         /* TLS extensions*/
1198         if (s->version >= SSL3_VERSION)
1199                 {
1200                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1201                         {
1202                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1203                         goto err;
1204                         }
1205                 }
1206
1207         /* Check if we want to use external pre-shared secret for this
1208          * handshake for not reused session only. We need to generate
1209          * server_random before calling tls_session_secret_cb in order to allow
1210          * SessionTicket processing to use it in key derivation. */
1211         {
1212                 unsigned long Time;
1213                 unsigned char *pos;
1214                 Time=(unsigned long)time(NULL);                 /* Time */
1215                 pos=s->s3->server_random;
1216                 l2n(Time,pos);
1217                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1218                         {
1219                         goto f_err;
1220                         }
1221         }
1222
1223         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1224                 {
1225                 SSL_CIPHER *pref_cipher=NULL;
1226
1227                 s->session->master_key_length=sizeof(s->session->master_key);
1228                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1229                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1230                         {
1231                         s->hit=1;
1232                         s->session->ciphers=ciphers;
1233                         s->session->verify_result=X509_V_OK;
1234
1235                         ciphers=NULL;
1236
1237                         /* check if some cipher was preferred by call back */
1238                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1239                         if (pref_cipher == NULL)
1240                                 {
1241                                 al=SSL_AD_HANDSHAKE_FAILURE;
1242                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1243                                 goto f_err;
1244                                 }
1245
1246                         s->session->cipher=pref_cipher;
1247
1248                         if (s->cipher_list)
1249                                 sk_SSL_CIPHER_free(s->cipher_list);
1250
1251                         if (s->cipher_list_by_id)
1252                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1253
1254                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1255                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1256                         }
1257                 }
1258 #endif
1259
1260         /* Worst case, we will use the NULL compression, but if we have other
1261          * options, we will now look for them.  We have i-1 compression
1262          * algorithms from the client, starting at q. */
1263         s->s3->tmp.new_compression=NULL;
1264 #ifndef OPENSSL_NO_COMP
1265         /* This only happens if we have a cache hit */
1266         if (s->session->compress_meth != 0)
1267                 {
1268                 int m, comp_id = s->session->compress_meth;
1269                 /* Perform sanity checks on resumed compression algorithm */
1270                 /* Can't disable compression */
1271                 if (s->options & SSL_OP_NO_COMPRESSION)
1272                         {
1273                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1274                         goto f_err;
1275                         }
1276                 /* Look for resumed compression method */
1277                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1278                         {
1279                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1280                         if (comp_id == comp->id)
1281                                 {
1282                                 s->s3->tmp.new_compression=comp;
1283                                 break;
1284                                 }
1285                         }
1286                 if (s->s3->tmp.new_compression == NULL)
1287                         {
1288                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1289                         goto f_err;
1290                         }
1291                 /* Look for resumed method in compression list */
1292                 for (m = 0; m < i; m++)
1293                         {
1294                         if (q[m] == comp_id)
1295                                 break;
1296                         }
1297                 if (m >= i)
1298                         {
1299                         al=SSL_AD_ILLEGAL_PARAMETER;
1300                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1301                         goto f_err;
1302                         }
1303                 }
1304         else if (s->hit)
1305                 comp = NULL;
1306         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1307                 { /* See if we have a match */
1308                 int m,nn,o,v,done=0;
1309
1310                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1311                 for (m=0; m<nn; m++)
1312                         {
1313                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1314                         v=comp->id;
1315                         for (o=0; o<i; o++)
1316                                 {
1317                                 if (v == q[o])
1318                                         {
1319                                         done=1;
1320                                         break;
1321                                         }
1322                                 }
1323                         if (done) break;
1324                         }
1325                 if (done)
1326                         s->s3->tmp.new_compression=comp;
1327                 else
1328                         comp=NULL;
1329                 }
1330 #else
1331         /* If compression is disabled we'd better not try to resume a session
1332          * using compression.
1333          */
1334         if (s->session->compress_meth != 0)
1335                 {
1336                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1337                 goto f_err;
1338                 }
1339 #endif
1340
1341         /* Given s->session->ciphers and SSL_get_ciphers, we must
1342          * pick a cipher */
1343
1344         if (!s->hit)
1345                 {
1346 #ifdef OPENSSL_NO_COMP
1347                 s->session->compress_meth=0;
1348 #else
1349                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1350 #endif
1351                 if (s->session->ciphers != NULL)
1352                         sk_SSL_CIPHER_free(s->session->ciphers);
1353                 s->session->ciphers=ciphers;
1354                 if (ciphers == NULL)
1355                         {
1356                         al=SSL_AD_ILLEGAL_PARAMETER;
1357                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1358                         goto f_err;
1359                         }
1360                 ciphers=NULL;
1361                 /* Let cert callback update server certificates if required */
1362                 if (s->cert->cert_cb
1363                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
1364                         {
1365                         al=SSL_AD_INTERNAL_ERROR;
1366                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1367                         goto f_err;
1368                         }
1369                 c=ssl3_choose_cipher(s,s->session->ciphers,
1370                                      SSL_get_ciphers(s));
1371
1372                 if (c == NULL)
1373                         {
1374                         al=SSL_AD_HANDSHAKE_FAILURE;
1375                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1376                         goto f_err;
1377                         }
1378                 s->s3->tmp.new_cipher=c;
1379                 /* check whether we should disable session resumption */
1380                 if (s->not_resumable_session_cb != NULL)
1381                         s->session->not_resumable=s->not_resumable_session_cb(s,
1382                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1383                 if (s->session->not_resumable)
1384                         /* do not send a session ticket */
1385                         s->tlsext_ticket_expected = 0;
1386                 }
1387         else
1388                 {
1389                 /* Session-id reuse */
1390 #ifdef REUSE_CIPHER_BUG
1391                 STACK_OF(SSL_CIPHER) *sk;
1392                 SSL_CIPHER *nc=NULL;
1393                 SSL_CIPHER *ec=NULL;
1394
1395                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1396                         {
1397                         sk=s->session->ciphers;
1398                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1399                                 {
1400                                 c=sk_SSL_CIPHER_value(sk,i);
1401                                 if (c->algorithm_enc & SSL_eNULL)
1402                                         nc=c;
1403                                 if (SSL_C_IS_EXPORT(c))
1404                                         ec=c;
1405                                 }
1406                         if (nc != NULL)
1407                                 s->s3->tmp.new_cipher=nc;
1408                         else if (ec != NULL)
1409                                 s->s3->tmp.new_cipher=ec;
1410                         else
1411                                 s->s3->tmp.new_cipher=s->session->cipher;
1412                         }
1413                 else
1414 #endif
1415                 s->s3->tmp.new_cipher=s->session->cipher;
1416                 }
1417
1418         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1419                 {
1420                 if (!ssl3_digest_cached_records(s))
1421                         goto f_err;
1422                 }
1423         
1424         /* we now have the following setup. 
1425          * client_random
1426          * cipher_list          - our prefered list of ciphers
1427          * ciphers              - the clients prefered list of ciphers
1428          * compression          - basically ignored right now
1429          * ssl version is set   - sslv3
1430          * s->session           - The ssl session has been setup.
1431          * s->hit               - session reuse flag
1432          * s->tmp.new_cipher    - the new cipher to use.
1433          */
1434
1435         /* Handles TLS extensions that we couldn't check earlier */
1436         if (s->version >= SSL3_VERSION)
1437                 {
1438                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1439                         {
1440                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1441                         goto err;
1442                         }
1443                 }
1444
1445         if (ret < 0) ret=1;
1446         if (0)
1447                 {
1448 f_err:
1449                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1450                 }
1451 err:
1452         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1453         return(ret);
1454         }
1455
1456 int ssl3_send_server_hello(SSL *s)
1457         {
1458         unsigned char *buf;
1459         unsigned char *p,*d;
1460         int i,sl;
1461         unsigned long l;
1462 #ifdef OPENSSL_NO_TLSEXT
1463         unsigned long Time;
1464 #endif
1465
1466         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1467                 {
1468                 buf=(unsigned char *)s->init_buf->data;
1469 #ifdef OPENSSL_NO_TLSEXT
1470                 p=s->s3->server_random;
1471                 /* Generate server_random if it was not needed previously */
1472                 Time=(unsigned long)time(NULL);                 /* Time */
1473                 l2n(Time,p);
1474                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1475                         return -1;
1476 #endif
1477                 /* Do the message type and length last */
1478                 d=p= &(buf[4]);
1479
1480                 *(p++)=s->version>>8;
1481                 *(p++)=s->version&0xff;
1482
1483                 /* Random stuff */
1484                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1485                 p+=SSL3_RANDOM_SIZE;
1486
1487                 /* There are several cases for the session ID to send
1488                  * back in the server hello:
1489                  * - For session reuse from the session cache,
1490                  *   we send back the old session ID.
1491                  * - If stateless session reuse (using a session ticket)
1492                  *   is successful, we send back the client's "session ID"
1493                  *   (which doesn't actually identify the session).
1494                  * - If it is a new session, we send back the new
1495                  *   session ID.
1496                  * - However, if we want the new session to be single-use,
1497                  *   we send back a 0-length session ID.
1498                  * s->hit is non-zero in either case of session reuse,
1499                  * so the following won't overwrite an ID that we're supposed
1500                  * to send back.
1501                  */
1502                 if (s->session->not_resumable ||
1503                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1504                                 && !s->hit))
1505                         s->session->session_id_length=0;
1506
1507                 sl=s->session->session_id_length;
1508                 if (sl > (int)sizeof(s->session->session_id))
1509                         {
1510                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1511                         return -1;
1512                         }
1513                 *(p++)=sl;
1514                 memcpy(p,s->session->session_id,sl);
1515                 p+=sl;
1516
1517                 /* put the cipher */
1518                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1519                 p+=i;
1520
1521                 /* put the compression method */
1522 #ifdef OPENSSL_NO_COMP
1523                         *(p++)=0;
1524 #else
1525                 if (s->s3->tmp.new_compression == NULL)
1526                         *(p++)=0;
1527                 else
1528                         *(p++)=s->s3->tmp.new_compression->id;
1529 #endif
1530 #ifndef OPENSSL_NO_TLSEXT
1531                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1532                         {
1533                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1534                         return -1;
1535                         }
1536                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1537                         {
1538                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1539                         return -1;
1540                         }
1541 #endif
1542                 /* do the header */
1543                 l=(p-d);
1544                 d=buf;
1545                 *(d++)=SSL3_MT_SERVER_HELLO;
1546                 l2n3(l,d);
1547
1548                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1549                 /* number of bytes to write */
1550                 s->init_num=p-buf;
1551                 s->init_off=0;
1552                 }
1553
1554         /* SSL3_ST_SW_SRVR_HELLO_B */
1555         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1556         }
1557
1558 int ssl3_send_server_done(SSL *s)
1559         {
1560         unsigned char *p;
1561
1562         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1563                 {
1564                 p=(unsigned char *)s->init_buf->data;
1565
1566                 /* do the header */
1567                 *(p++)=SSL3_MT_SERVER_DONE;
1568                 *(p++)=0;
1569                 *(p++)=0;
1570                 *(p++)=0;
1571
1572                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1573                 /* number of bytes to write */
1574                 s->init_num=4;
1575                 s->init_off=0;
1576                 }
1577
1578         /* SSL3_ST_SW_SRVR_DONE_B */
1579         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1580         }
1581
1582 int ssl3_send_server_key_exchange(SSL *s)
1583         {
1584 #ifndef OPENSSL_NO_RSA
1585         unsigned char *q;
1586         int j,num;
1587         RSA *rsa;
1588         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1589         unsigned int u;
1590 #endif
1591 #ifndef OPENSSL_NO_DH
1592         DH *dh=NULL,*dhp;
1593 #endif
1594 #ifndef OPENSSL_NO_ECDH
1595         EC_KEY *ecdh=NULL, *ecdhp;
1596         unsigned char *encodedPoint = NULL;
1597         int encodedlen = 0;
1598         int curve_id = 0;
1599         BN_CTX *bn_ctx = NULL; 
1600 #endif
1601         EVP_PKEY *pkey;
1602         const EVP_MD *md = NULL;
1603         unsigned char *p,*d;
1604         int al,i;
1605         unsigned long type;
1606         int n;
1607         CERT *cert;
1608         BIGNUM *r[4];
1609         int nr[4],kn;
1610         BUF_MEM *buf;
1611         EVP_MD_CTX md_ctx;
1612
1613         EVP_MD_CTX_init(&md_ctx);
1614         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1615                 {
1616                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1617                 cert=s->cert;
1618
1619                 buf=s->init_buf;
1620
1621                 r[0]=r[1]=r[2]=r[3]=NULL;
1622                 n=0;
1623 #ifndef OPENSSL_NO_RSA
1624                 if (type & SSL_kRSA)
1625                         {
1626                         rsa=cert->rsa_tmp;
1627                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1628                                 {
1629                                 rsa=s->cert->rsa_tmp_cb(s,
1630                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1631                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1632                                 if(rsa == NULL)
1633                                 {
1634                                         al=SSL_AD_HANDSHAKE_FAILURE;
1635                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1636                                         goto f_err;
1637                                 }
1638                                 RSA_up_ref(rsa);
1639                                 cert->rsa_tmp=rsa;
1640                                 }
1641                         if (rsa == NULL)
1642                                 {
1643                                 al=SSL_AD_HANDSHAKE_FAILURE;
1644                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1645                                 goto f_err;
1646                                 }
1647                         r[0]=rsa->n;
1648                         r[1]=rsa->e;
1649                         s->s3->tmp.use_rsa_tmp=1;
1650                         }
1651                 else
1652 #endif
1653 #ifndef OPENSSL_NO_DH
1654                         if (type & SSL_kEDH)
1655                         {
1656                         dhp=cert->dh_tmp;
1657                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1658                                 dhp=s->cert->dh_tmp_cb(s,
1659                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1660                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1661                         if (dhp == NULL)
1662                                 {
1663                                 al=SSL_AD_HANDSHAKE_FAILURE;
1664                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1665                                 goto f_err;
1666                                 }
1667
1668                         if (s->s3->tmp.dh != NULL)
1669                                 {
1670                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1671                                 goto err;
1672                                 }
1673
1674                         if ((dh=DHparams_dup(dhp)) == NULL)
1675                                 {
1676                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1677                                 goto err;
1678                                 }
1679
1680                         s->s3->tmp.dh=dh;
1681                         if ((dhp->pub_key == NULL ||
1682                              dhp->priv_key == NULL ||
1683                              (s->options & SSL_OP_SINGLE_DH_USE)))
1684                                 {
1685                                 if(!DH_generate_key(dh))
1686                                     {
1687                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1688                                            ERR_R_DH_LIB);
1689                                     goto err;
1690                                     }
1691                                 }
1692                         else
1693                                 {
1694                                 dh->pub_key=BN_dup(dhp->pub_key);
1695                                 dh->priv_key=BN_dup(dhp->priv_key);
1696                                 if ((dh->pub_key == NULL) ||
1697                                         (dh->priv_key == NULL))
1698                                         {
1699                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1700                                         goto err;
1701                                         }
1702                                 }
1703                         r[0]=dh->p;
1704                         r[1]=dh->g;
1705                         r[2]=dh->pub_key;
1706                         }
1707                 else 
1708 #endif
1709 #ifndef OPENSSL_NO_ECDH
1710                         if (type & SSL_kEECDH)
1711                         {
1712                         const EC_GROUP *group;
1713
1714                         ecdhp=cert->ecdh_tmp;
1715                         if (s->cert->ecdh_tmp_auto)
1716                                 {
1717                                 /* Get NID of appropriate shared curve */
1718                                 int nid = tls1_shared_curve(s, -2);
1719                                 if (nid != NID_undef)
1720                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1721                                 }
1722                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1723                                 {
1724                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1725                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1726                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1727                                 }
1728                         if (ecdhp == NULL)
1729                                 {
1730                                 al=SSL_AD_HANDSHAKE_FAILURE;
1731                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1732                                 goto f_err;
1733                                 }
1734
1735                         if (s->s3->tmp.ecdh != NULL)
1736                                 {
1737                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1738                                 goto err;
1739                                 }
1740
1741                         /* Duplicate the ECDH structure. */
1742                         if (ecdhp == NULL)
1743                                 {
1744                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1745                                 goto err;
1746                                 }
1747                         if (s->cert->ecdh_tmp_auto)
1748                                 ecdh = ecdhp;
1749                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1750                                 {
1751                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1752                                 goto err;
1753                                 }
1754
1755                         s->s3->tmp.ecdh=ecdh;
1756                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1757                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1758                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1759                                 {
1760                                 if(!EC_KEY_generate_key(ecdh))
1761                                     {
1762                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1763                                     goto err;
1764                                     }
1765                                 }
1766
1767                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1768                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1769                             (EC_KEY_get0_private_key(ecdh) == NULL))
1770                                 {
1771                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1772                                 goto err;
1773                                 }
1774
1775                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1776                             (EC_GROUP_get_degree(group) > 163)) 
1777                                 {
1778                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1779                                 goto err;
1780                                 }
1781
1782                         /* XXX: For now, we only support ephemeral ECDH
1783                          * keys over named (not generic) curves. For 
1784                          * supported named curves, curve_id is non-zero.
1785                          */
1786                         if ((curve_id = 
1787                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1788                             == 0)
1789                                 {
1790                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1791                                 goto err;
1792                                 }
1793
1794                         /* Encode the public key.
1795                          * First check the size of encoding and
1796                          * allocate memory accordingly.
1797                          */
1798                         encodedlen = EC_POINT_point2oct(group, 
1799                             EC_KEY_get0_public_key(ecdh),
1800                             POINT_CONVERSION_UNCOMPRESSED, 
1801                             NULL, 0, NULL);
1802
1803                         encodedPoint = (unsigned char *) 
1804                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1805                         bn_ctx = BN_CTX_new();
1806                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1807                                 {
1808                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1809                                 goto err;
1810                                 }
1811
1812
1813                         encodedlen = EC_POINT_point2oct(group, 
1814                             EC_KEY_get0_public_key(ecdh), 
1815                             POINT_CONVERSION_UNCOMPRESSED, 
1816                             encodedPoint, encodedlen, bn_ctx);
1817
1818                         if (encodedlen == 0) 
1819                                 {
1820                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1821                                 goto err;
1822                                 }
1823
1824                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1825
1826                         /* XXX: For now, we only support named (not 
1827                          * generic) curves in ECDH ephemeral key exchanges.
1828                          * In this situation, we need four additional bytes
1829                          * to encode the entire ServerECDHParams
1830                          * structure. 
1831                          */
1832                         n = 4 + encodedlen;
1833
1834                         /* We'll generate the serverKeyExchange message
1835                          * explicitly so we can set these to NULLs
1836                          */
1837                         r[0]=NULL;
1838                         r[1]=NULL;
1839                         r[2]=NULL;
1840                         r[3]=NULL;
1841                         }
1842                 else 
1843 #endif /* !OPENSSL_NO_ECDH */
1844 #ifndef OPENSSL_NO_PSK
1845                         if (type & SSL_kPSK)
1846                                 {
1847                                 /* reserve size for record length and PSK identity hint*/
1848                                 n+=2+strlen(s->ctx->psk_identity_hint);
1849                                 }
1850                         else
1851 #endif /* !OPENSSL_NO_PSK */
1852 #ifndef OPENSSL_NO_SRP
1853                 if (type & SSL_kSRP)
1854                         {
1855                         if ((s->srp_ctx.N == NULL) ||
1856                                 (s->srp_ctx.g == NULL) ||
1857                                 (s->srp_ctx.s == NULL) ||
1858                                 (s->srp_ctx.B == NULL))
1859                                 {
1860                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1861                                 goto err;
1862                                 }
1863                         r[0]=s->srp_ctx.N;
1864                         r[1]=s->srp_ctx.g;
1865                         r[2]=s->srp_ctx.s;
1866                         r[3]=s->srp_ctx.B;
1867                         }
1868                 else 
1869 #endif
1870                         {
1871                         al=SSL_AD_HANDSHAKE_FAILURE;
1872                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1873                         goto f_err;
1874                         }
1875                 for (i=0; r[i] != NULL && i<4; i++)
1876                         {
1877                         nr[i]=BN_num_bytes(r[i]);
1878 #ifndef OPENSSL_NO_SRP
1879                         if ((i == 2) && (type & SSL_kSRP))
1880                                 n+=1+nr[i];
1881                         else
1882 #endif
1883                         n+=2+nr[i];
1884                         }
1885
1886                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1887                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1888                         {
1889                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1890                                 == NULL)
1891                                 {
1892                                 al=SSL_AD_DECODE_ERROR;
1893                                 goto f_err;
1894                                 }
1895                         kn=EVP_PKEY_size(pkey);
1896                         }
1897                 else
1898                         {
1899                         pkey=NULL;
1900                         kn=0;
1901                         }
1902
1903                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1904                         {
1905                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1906                         goto err;
1907                         }
1908                 d=(unsigned char *)s->init_buf->data;
1909                 p= &(d[4]);
1910
1911                 for (i=0; r[i] != NULL && i<4; i++)
1912                         {
1913 #ifndef OPENSSL_NO_SRP
1914                         if ((i == 2) && (type & SSL_kSRP))
1915                                 {
1916                                 *p = nr[i];
1917                                 p++;
1918                                 }
1919                         else
1920 #endif
1921                         s2n(nr[i],p);
1922                         BN_bn2bin(r[i],p);
1923                         p+=nr[i];
1924                         }
1925
1926 #ifndef OPENSSL_NO_ECDH
1927                 if (type & SSL_kEECDH) 
1928                         {
1929                         /* XXX: For now, we only support named (not generic) curves.
1930                          * In this situation, the serverKeyExchange message has:
1931                          * [1 byte CurveType], [2 byte CurveName]
1932                          * [1 byte length of encoded point], followed by
1933                          * the actual encoded point itself
1934                          */
1935                         *p = NAMED_CURVE_TYPE;
1936                         p += 1;
1937                         *p = 0;
1938                         p += 1;
1939                         *p = curve_id;
1940                         p += 1;
1941                         *p = encodedlen;
1942                         p += 1;
1943                         memcpy((unsigned char*)p, 
1944                             (unsigned char *)encodedPoint, 
1945                             encodedlen);
1946                         OPENSSL_free(encodedPoint);
1947                         encodedPoint = NULL;
1948                         p += encodedlen;
1949                         }
1950 #endif
1951
1952 #ifndef OPENSSL_NO_PSK
1953                 if (type & SSL_kPSK)
1954                         {
1955                         /* copy PSK identity hint */
1956                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1957                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1958                         p+=strlen(s->ctx->psk_identity_hint);
1959                         }
1960 #endif
1961
1962                 /* not anonymous */
1963                 if (pkey != NULL)
1964                         {
1965                         /* n is the length of the params, they start at &(d[4])
1966                          * and p points to the space at the end. */
1967 #ifndef OPENSSL_NO_RSA
1968                         if (pkey->type == EVP_PKEY_RSA
1969                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1970                                 {
1971                                 q=md_buf;
1972                                 j=0;
1973                                 for (num=2; num > 0; num--)
1974                                         {
1975                                         EVP_MD_CTX_set_flags(&md_ctx,
1976                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1977                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1978                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1979                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1980                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1981                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1982                                         EVP_DigestFinal_ex(&md_ctx,q,
1983                                                 (unsigned int *)&i);
1984                                         q+=i;
1985                                         j+=i;
1986                                         }
1987                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1988                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1989                                         {
1990                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1991                                         goto err;
1992                                         }
1993                                 s2n(u,p);
1994                                 n+=u+2;
1995                                 }
1996                         else
1997 #endif
1998                         if (md)
1999                                 {
2000                                 /* For TLS1.2 and later send signature
2001                                  * algorithm */
2002                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2003                                         {
2004                                         if (!tls12_get_sigandhash(p, pkey, md))
2005                                                 {
2006                                                 /* Should never happen */
2007                                                 al=SSL_AD_INTERNAL_ERROR;
2008                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2009                                                 goto f_err;
2010                                                 }
2011                                         p+=2;
2012                                         }
2013 #ifdef SSL_DEBUG
2014                                 fprintf(stderr, "Using hash %s\n",
2015                                                         EVP_MD_name(md));
2016 #endif
2017                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2018                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2019                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2020                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
2021                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2022                                         (unsigned int *)&i,pkey))
2023                                         {
2024                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2025                                         goto err;
2026                                         }
2027                                 s2n(i,p);
2028                                 n+=i+2;
2029                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2030                                         n+= 2;
2031                                 }
2032                         else
2033                                 {
2034                                 /* Is this error check actually needed? */
2035                                 al=SSL_AD_HANDSHAKE_FAILURE;
2036                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2037                                 goto f_err;
2038                                 }
2039                         }
2040
2041                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2042                 l2n3(n,d);
2043
2044                 /* we should now have things packed up, so lets send
2045                  * it off */
2046                 s->init_num=n+4;
2047                 s->init_off=0;
2048                 }
2049
2050         s->state = SSL3_ST_SW_KEY_EXCH_B;
2051         EVP_MD_CTX_cleanup(&md_ctx);
2052         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2053 f_err:
2054         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2055 err:
2056 #ifndef OPENSSL_NO_ECDH
2057         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2058         BN_CTX_free(bn_ctx);
2059 #endif
2060         EVP_MD_CTX_cleanup(&md_ctx);
2061         return(-1);
2062         }
2063
2064 int ssl3_send_certificate_request(SSL *s)
2065         {
2066         unsigned char *p,*d;
2067         int i,j,nl,off,n;
2068         STACK_OF(X509_NAME) *sk=NULL;
2069         X509_NAME *name;
2070         BUF_MEM *buf;
2071
2072         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2073                 {
2074                 buf=s->init_buf;
2075
2076                 d=p=(unsigned char *)&(buf->data[4]);
2077
2078                 /* get the list of acceptable cert types */
2079                 p++;
2080                 n=ssl3_get_req_cert_type(s,p);
2081                 d[0]=n;
2082                 p+=n;
2083                 n++;
2084
2085                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2086                         {
2087                         const unsigned char *psigs;
2088                         nl = tls12_get_psigalgs(s, &psigs);
2089                         s2n(nl, p);
2090                         memcpy(p, psigs, nl);
2091                         p += nl;
2092                         n += nl + 2;
2093                         }
2094
2095                 off=n;
2096                 p+=2;
2097                 n+=2;
2098
2099                 sk=SSL_get_client_CA_list(s);
2100                 nl=0;
2101                 if (sk != NULL)
2102                         {
2103                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2104                                 {
2105                                 name=sk_X509_NAME_value(sk,i);
2106                                 j=i2d_X509_NAME(name,NULL);
2107                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2108                                         {
2109                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2110                                         goto err;
2111                                         }
2112                                 p=(unsigned char *)&(buf->data[4+n]);
2113                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2114                                         {
2115                                         s2n(j,p);
2116                                         i2d_X509_NAME(name,&p);
2117                                         n+=2+j;
2118                                         nl+=2+j;
2119                                         }
2120                                 else
2121                                         {
2122                                         d=p;
2123                                         i2d_X509_NAME(name,&p);
2124                                         j-=2; s2n(j,d); j+=2;
2125                                         n+=j;
2126                                         nl+=j;
2127                                         }
2128                                 }
2129                         }
2130                 /* else no CA names */
2131                 p=(unsigned char *)&(buf->data[4+off]);
2132                 s2n(nl,p);
2133
2134                 d=(unsigned char *)buf->data;
2135                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2136                 l2n3(n,d);
2137
2138                 /* we should now have things packed up, so lets send
2139                  * it off */
2140
2141                 s->init_num=n+4;
2142                 s->init_off=0;
2143 #ifdef NETSCAPE_HANG_BUG
2144                 p=(unsigned char *)s->init_buf->data + s->init_num;
2145
2146                 /* do the header */
2147                 *(p++)=SSL3_MT_SERVER_DONE;
2148                 *(p++)=0;
2149                 *(p++)=0;
2150                 *(p++)=0;
2151                 s->init_num += 4;
2152 #endif
2153
2154                 s->state = SSL3_ST_SW_CERT_REQ_B;
2155                 }
2156
2157         /* SSL3_ST_SW_CERT_REQ_B */
2158         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2159 err:
2160         return(-1);
2161         }
2162
2163 int ssl3_get_client_key_exchange(SSL *s)
2164         {
2165         int i,al,ok;
2166         long n;
2167         unsigned long alg_k;
2168         unsigned char *p;
2169 #ifndef OPENSSL_NO_RSA
2170         RSA *rsa=NULL;
2171         EVP_PKEY *pkey=NULL;
2172 #endif
2173 #ifndef OPENSSL_NO_DH
2174         BIGNUM *pub=NULL;
2175         DH *dh_srvr, *dh_clnt = NULL;
2176 #endif
2177 #ifndef OPENSSL_NO_KRB5
2178         KSSL_ERR kssl_err;
2179 #endif /* OPENSSL_NO_KRB5 */
2180
2181 #ifndef OPENSSL_NO_ECDH
2182         EC_KEY *srvr_ecdh = NULL;
2183         EVP_PKEY *clnt_pub_pkey = NULL;
2184         EC_POINT *clnt_ecpoint = NULL;
2185         BN_CTX *bn_ctx = NULL; 
2186 #endif
2187
2188         n=s->method->ssl_get_message(s,
2189                 SSL3_ST_SR_KEY_EXCH_A,
2190                 SSL3_ST_SR_KEY_EXCH_B,
2191                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2192                 2048, /* ??? */
2193                 &ok);
2194
2195         if (!ok) return((int)n);
2196         p=(unsigned char *)s->init_msg;
2197
2198         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2199
2200 #ifndef OPENSSL_NO_RSA
2201         if (alg_k & SSL_kRSA)
2202                 {
2203                 /* FIX THIS UP EAY EAY EAY EAY */
2204                 if (s->s3->tmp.use_rsa_tmp)
2205                         {
2206                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2207                                 rsa=s->cert->rsa_tmp;
2208                         /* Don't do a callback because rsa_tmp should
2209                          * be sent already */
2210                         if (rsa == NULL)
2211                                 {
2212                                 al=SSL_AD_HANDSHAKE_FAILURE;
2213                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2214                                 goto f_err;
2215
2216                                 }
2217                         }
2218                 else
2219                         {
2220                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2221                         if (    (pkey == NULL) ||
2222                                 (pkey->type != EVP_PKEY_RSA) ||
2223                                 (pkey->pkey.rsa == NULL))
2224                                 {
2225                                 al=SSL_AD_HANDSHAKE_FAILURE;
2226                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2227                                 goto f_err;
2228                                 }
2229                         rsa=pkey->pkey.rsa;
2230                         }
2231
2232                 /* TLS and [incidentally] DTLS{0xFEFF} */
2233                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2234                         {
2235                         n2s(p,i);
2236                         if (n != i+2)
2237                                 {
2238                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2239                                         {
2240                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2241                                         goto err;
2242                                         }
2243                                 else
2244                                         p-=2;
2245                                 }
2246                         else
2247                                 n=i;
2248                         }
2249
2250                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2251
2252                 al = -1;
2253                 
2254                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2255                         {
2256                         al=SSL_AD_DECODE_ERROR;
2257                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2258                         }
2259
2260                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2261                         {
2262                         /* The premaster secret must contain the same version number as the
2263                          * ClientHello to detect version rollback attacks (strangely, the
2264                          * protocol does not offer such protection for DH ciphersuites).
2265                          * However, buggy clients exist that send the negotiated protocol
2266                          * version instead if the server does not support the requested
2267                          * protocol version.
2268                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2269                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2270                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2271                                 {
2272                                 al=SSL_AD_DECODE_ERROR;
2273                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2274
2275                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2276                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2277                                  * number check as a "bad version oracle" -- an alert would
2278                                  * reveal that the plaintext corresponding to some ciphertext
2279                                  * made up by the adversary is properly formatted except
2280                                  * that the version number is wrong.  To avoid such attacks,
2281                                  * we should treat this just like any other decryption error. */
2282                                 }
2283                         }
2284
2285                 if (al != -1)
2286                         {
2287                         /* Some decryption failure -- use random value instead as countermeasure
2288                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2289                          * (see RFC 2246, section 7.4.7.1). */
2290                         ERR_clear_error();
2291                         i = SSL_MAX_MASTER_KEY_LENGTH;
2292                         p[0] = s->client_version >> 8;
2293                         p[1] = s->client_version & 0xff;
2294                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2295                                 goto err;
2296                         }
2297         
2298                 s->session->master_key_length=
2299                         s->method->ssl3_enc->generate_master_secret(s,
2300                                 s->session->master_key,
2301                                 p,i);
2302                 OPENSSL_cleanse(p,i);
2303                 }
2304         else
2305 #endif
2306 #ifndef OPENSSL_NO_DH
2307                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2308                 {
2309                 int idx = -1;
2310                 EVP_PKEY *skey = NULL;
2311                 if (n)
2312                         n2s(p,i);
2313                 else
2314                         i = 0;
2315                 if (n && n != i+2)
2316                         {
2317                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2318                                 {
2319                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2320                                 goto err;
2321                                 }
2322                         else
2323                                 {
2324                                 p-=2;
2325                                 i=(int)n;
2326                                 }
2327                         }
2328                 if (alg_k & SSL_kDHr)
2329                         idx = SSL_PKEY_DH_RSA;
2330                 else if (alg_k & SSL_kDHd)
2331                         idx = SSL_PKEY_DH_DSA;
2332                 if (idx >= 0)
2333                         {
2334                         skey = s->cert->pkeys[idx].privatekey;
2335                         if ((skey == NULL) ||
2336                                 (skey->type != EVP_PKEY_DH) ||
2337                                 (skey->pkey.dh == NULL))
2338                                 {
2339                                 al=SSL_AD_HANDSHAKE_FAILURE;
2340                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2341                                 goto f_err;
2342                                 }
2343                         dh_srvr = skey->pkey.dh;
2344                         }
2345                 else if (s->s3->tmp.dh == NULL)
2346                         {
2347                         al=SSL_AD_HANDSHAKE_FAILURE;
2348                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2349                         goto f_err;
2350                         }
2351                 else
2352                         dh_srvr=s->s3->tmp.dh;
2353
2354                 if (n == 0L)
2355                         {
2356                         /* Get pubkey from cert */
2357                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2358                         if (clkey)
2359                                 {
2360                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2361                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2362                                 }
2363                         if (dh_clnt == NULL)
2364                                 {
2365                                 al=SSL_AD_HANDSHAKE_FAILURE;
2366                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2367                                 goto f_err;
2368                                 }
2369                         EVP_PKEY_free(clkey);
2370                         pub = dh_clnt->pub_key;
2371                         }
2372                 else
2373                         pub=BN_bin2bn(p,i,NULL);
2374                 if (pub == NULL)
2375                         {
2376                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2377                         goto err;
2378                         }
2379
2380                 i=DH_compute_key(p,pub,dh_srvr);
2381
2382                 if (i <= 0)
2383                         {
2384                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2385                         BN_clear_free(pub);
2386                         goto err;
2387                         }
2388
2389                 DH_free(s->s3->tmp.dh);
2390                 s->s3->tmp.dh=NULL;
2391                 if (dh_clnt)
2392                         DH_free(dh_clnt);
2393                 else
2394                         BN_clear_free(pub);
2395                 pub=NULL;
2396                 s->session->master_key_length=
2397                         s->method->ssl3_enc->generate_master_secret(s,
2398                                 s->session->master_key,p,i);
2399                 OPENSSL_cleanse(p,i);
2400                 if (dh_clnt)
2401                         return 2;
2402                 }
2403         else
2404 #endif
2405 #ifndef OPENSSL_NO_KRB5
2406         if (alg_k & SSL_kKRB5)
2407                 {
2408                 krb5_error_code         krb5rc;
2409                 krb5_data               enc_ticket;
2410                 krb5_data               authenticator;
2411                 krb5_data               enc_pms;
2412                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2413                 EVP_CIPHER_CTX          ciph_ctx;
2414                 const EVP_CIPHER        *enc = NULL;
2415                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2416                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2417                                                + EVP_MAX_BLOCK_LENGTH];
2418                 int                  padl, outl;
2419                 krb5_timestamp          authtime = 0;
2420                 krb5_ticket_times       ttimes;
2421
2422                 EVP_CIPHER_CTX_init(&ciph_ctx);
2423
2424                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2425
2426                 n2s(p,i);
2427                 enc_ticket.length = i;
2428
2429                 if (n < (long)(enc_ticket.length + 6))
2430                         {
2431                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2432                                 SSL_R_DATA_LENGTH_TOO_LONG);
2433                         goto err;
2434                         }
2435
2436                 enc_ticket.data = (char *)p;
2437                 p+=enc_ticket.length;
2438
2439                 n2s(p,i);
2440                 authenticator.length = i;
2441
2442                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2443                         {
2444                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2445                                 SSL_R_DATA_LENGTH_TOO_LONG);
2446                         goto err;
2447                         }
2448
2449                 authenticator.data = (char *)p;
2450                 p+=authenticator.length;
2451
2452                 n2s(p,i);
2453                 enc_pms.length = i;
2454                 enc_pms.data = (char *)p;
2455                 p+=enc_pms.length;
2456
2457                 /* Note that the length is checked again below,
2458                 ** after decryption
2459                 */
2460                 if(enc_pms.length > sizeof pms)
2461                         {
2462                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2463                                SSL_R_DATA_LENGTH_TOO_LONG);
2464                         goto err;
2465                         }
2466
2467                 if (n != (long)(enc_ticket.length + authenticator.length +
2468                                                 enc_pms.length + 6))
2469                         {
2470                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2471                                 SSL_R_DATA_LENGTH_TOO_LONG);
2472                         goto err;
2473                         }
2474
2475                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2476                                         &kssl_err)) != 0)
2477                         {
2478 #ifdef KSSL_DEBUG
2479                         printf("kssl_sget_tkt rtn %d [%d]\n",
2480                                 krb5rc, kssl_err.reason);
2481                         if (kssl_err.text)
2482                                 printf("kssl_err text= %s\n", kssl_err.text);
2483 #endif  /* KSSL_DEBUG */
2484                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2485                                 kssl_err.reason);
2486                         goto err;
2487                         }
2488
2489                 /*  Note: no authenticator is not considered an error,
2490                 **  but will return authtime == 0.
2491                 */
2492                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2493                                         &authtime, &kssl_err)) != 0)
2494                         {
2495 #ifdef KSSL_DEBUG
2496                         printf("kssl_check_authent rtn %d [%d]\n",
2497                                 krb5rc, kssl_err.reason);
2498                         if (kssl_err.text)
2499                                 printf("kssl_err text= %s\n", kssl_err.text);
2500 #endif  /* KSSL_DEBUG */
2501                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2502                                 kssl_err.reason);
2503                         goto err;
2504                         }
2505
2506                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2507                         {
2508                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2509                         goto err;
2510                         }
2511
2512 #ifdef KSSL_DEBUG
2513                 kssl_ctx_show(kssl_ctx);
2514 #endif  /* KSSL_DEBUG */
2515
2516                 enc = kssl_map_enc(kssl_ctx->enctype);
2517                 if (enc == NULL)
2518                     goto err;
2519
2520                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2521
2522                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2523                         {
2524                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2525                                 SSL_R_DECRYPTION_FAILED);
2526                         goto err;
2527                         }
2528                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2529                                         (unsigned char *)enc_pms.data, enc_pms.length))
2530                         {
2531                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2532                                 SSL_R_DECRYPTION_FAILED);
2533                         goto err;
2534                         }
2535                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2536                         {
2537                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2538                                 SSL_R_DATA_LENGTH_TOO_LONG);
2539                         goto err;
2540                         }
2541                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2542                         {
2543                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2544                                 SSL_R_DECRYPTION_FAILED);
2545                         goto err;
2546                         }
2547                 outl += padl;
2548                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2549                         {
2550                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2551                                 SSL_R_DATA_LENGTH_TOO_LONG);
2552                         goto err;
2553                         }
2554                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2555                     {
2556                     /* The premaster secret must contain the same version number as the
2557                      * ClientHello to detect version rollback attacks (strangely, the
2558                      * protocol does not offer such protection for DH ciphersuites).
2559                      * However, buggy clients exist that send random bytes instead of
2560                      * the protocol version.
2561                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2562                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2563                      */
2564                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2565                         {
2566                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2567                                SSL_AD_DECODE_ERROR);
2568                         goto err;
2569                         }
2570                     }
2571
2572                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2573
2574                 s->session->master_key_length=
2575                         s->method->ssl3_enc->generate_master_secret(s,
2576                                 s->session->master_key, pms, outl);
2577
2578                 if (kssl_ctx->client_princ)
2579                         {
2580                         size_t len = strlen(kssl_ctx->client_princ);
2581                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2582                                 {
2583                                 s->session->krb5_client_princ_len = len;
2584                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2585                                 }
2586                         }
2587
2588
2589                 /*  Was doing kssl_ctx_free() here,
2590                 **  but it caused problems for apache.
2591                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2592                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2593                 */
2594                 }
2595         else
2596 #endif  /* OPENSSL_NO_KRB5 */
2597
2598 #ifndef OPENSSL_NO_ECDH
2599                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2600                 {
2601                 int ret = 1;
2602                 int field_size = 0;
2603                 const EC_KEY   *tkey;
2604                 const EC_GROUP *group;
2605                 const BIGNUM *priv_key;
2606
2607                 /* initialize structures for server's ECDH key pair */
2608                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2609                         {
2610                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2611                             ERR_R_MALLOC_FAILURE);
2612                         goto err;
2613                         }
2614
2615                 /* Let's get server private key and group information */
2616                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2617                         { 
2618                         /* use the certificate */
2619                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2620                         }
2621                 else
2622                         {
2623                         /* use the ephermeral values we saved when
2624                          * generating the ServerKeyExchange msg.
2625                          */
2626                         tkey = s->s3->tmp.ecdh;
2627                         }
2628
2629                 group    = EC_KEY_get0_group(tkey);
2630                 priv_key = EC_KEY_get0_private_key(tkey);
2631
2632                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2633                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2634                         {
2635                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2636                                ERR_R_EC_LIB);
2637                         goto err;
2638                         }
2639
2640                 /* Let's get client's public key */
2641                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2642                         {
2643                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2644                             ERR_R_MALLOC_FAILURE);
2645                         goto err;
2646                         }
2647
2648                 if (n == 0L) 
2649                         {
2650                         /* Client Publickey was in Client Certificate */
2651
2652                          if (alg_k & SSL_kEECDH)
2653                                  {
2654                                  al=SSL_AD_HANDSHAKE_FAILURE;
2655                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2656                                  goto f_err;
2657                                  }
2658                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2659                             == NULL) || 
2660                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2661                                 {
2662                                 /* XXX: For now, we do not support client
2663                                  * authentication using ECDH certificates
2664                                  * so this branch (n == 0L) of the code is
2665                                  * never executed. When that support is
2666                                  * added, we ought to ensure the key 
2667                                  * received in the certificate is 
2668                                  * authorized for key agreement.
2669                                  * ECDH_compute_key implicitly checks that
2670                                  * the two ECDH shares are for the same
2671                                  * group.
2672                                  */
2673                                 al=SSL_AD_HANDSHAKE_FAILURE;
2674                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2675                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2676                                 goto f_err;
2677                                 }
2678
2679                         if (EC_POINT_copy(clnt_ecpoint,
2680                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2681                                 {
2682                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2683                                         ERR_R_EC_LIB);
2684                                 goto err;
2685                                 }
2686                         ret = 2; /* Skip certificate verify processing */
2687                         }
2688                 else
2689                         {
2690                         /* Get client's public key from encoded point
2691                          * in the ClientKeyExchange message.
2692                          */
2693                         if ((bn_ctx = BN_CTX_new()) == NULL)
2694                                 {
2695                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2696                                     ERR_R_MALLOC_FAILURE);
2697                                 goto err;
2698                                 }
2699
2700                         /* Get encoded point length */
2701                         i = *p; 
2702                         p += 1;
2703                         if (n != 1 + i)
2704                                 {
2705                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2706                                     ERR_R_EC_LIB);
2707                                 goto err;
2708                                 }
2709                         if (EC_POINT_oct2point(group, 
2710                             clnt_ecpoint, p, i, bn_ctx) == 0)
2711                                 {
2712                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2713                                     ERR_R_EC_LIB);
2714                                 goto err;
2715                                 }
2716                         /* p is pointing to somewhere in the buffer
2717                          * currently, so set it to the start 
2718                          */ 
2719                         p=(unsigned char *)s->init_buf->data;
2720                         }
2721
2722                 /* Compute the shared pre-master secret */
2723                 field_size = EC_GROUP_get_degree(group);
2724                 if (field_size <= 0)
2725                         {
2726                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2727                                ERR_R_ECDH_LIB);
2728                         goto err;
2729                         }
2730                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2731                 if (i <= 0)
2732                         {
2733                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2734                             ERR_R_ECDH_LIB);
2735                         goto err;
2736                         }
2737
2738                 EVP_PKEY_free(clnt_pub_pkey);
2739                 EC_POINT_free(clnt_ecpoint);
2740                 EC_KEY_free(srvr_ecdh);
2741                 BN_CTX_free(bn_ctx);
2742                 EC_KEY_free(s->s3->tmp.ecdh);
2743                 s->s3->tmp.ecdh = NULL; 
2744
2745                 /* Compute the master secret */
2746                 s->session->master_key_length = s->method->ssl3_enc-> \
2747                     generate_master_secret(s, s->session->master_key, p, i);
2748                 
2749                 OPENSSL_cleanse(p, i);
2750                 return (ret);
2751                 }
2752         else
2753 #endif
2754 #ifndef OPENSSL_NO_PSK
2755                 if (alg_k & SSL_kPSK)
2756                         {
2757                         unsigned char *t = NULL;
2758                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2759                         unsigned int pre_ms_len = 0, psk_len = 0;
2760                         int psk_err = 1;
2761                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2762
2763                         al=SSL_AD_HANDSHAKE_FAILURE;
2764
2765                         n2s(p,i);
2766                         if (n != i+2)
2767                                 {
2768                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2769                                         SSL_R_LENGTH_MISMATCH);
2770                                 goto psk_err;
2771                                 }
2772                         if (i > PSK_MAX_IDENTITY_LEN)
2773                                 {
2774                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2775                                         SSL_R_DATA_LENGTH_TOO_LONG);
2776                                 goto psk_err;
2777                                 }
2778                         if (s->psk_server_callback == NULL)
2779                                 {
2780                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2781                                        SSL_R_PSK_NO_SERVER_CB);
2782                                 goto psk_err;
2783                                 }
2784
2785                         /* Create guaranteed NULL-terminated identity
2786                          * string for the callback */
2787                         memcpy(tmp_id, p, i);
2788                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2789                         psk_len = s->psk_server_callback(s, tmp_id,
2790                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2791                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2792
2793                         if (psk_len > PSK_MAX_PSK_LEN)
2794                                 {
2795                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2796                                         ERR_R_INTERNAL_ERROR);
2797                                 goto psk_err;
2798                                 }
2799                         else if (psk_len == 0)
2800                                 {
2801                                 /* PSK related to the given identity not found */
2802                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2803                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2804                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2805                                 goto psk_err;
2806                                 }
2807
2808                         /* create PSK pre_master_secret */
2809                         pre_ms_len=2+psk_len+2+psk_len;
2810                         t = psk_or_pre_ms;
2811                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2812                         s2n(psk_len, t);
2813                         memset(t, 0, psk_len);
2814                         t+=psk_len;
2815                         s2n(psk_len, t);
2816
2817                         if (s->session->psk_identity != NULL)
2818                                 OPENSSL_free(s->session->psk_identity);
2819                         s->session->psk_identity = BUF_strdup((char *)p);
2820                         if (s->session->psk_identity == NULL)
2821                                 {
2822                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2823                                         ERR_R_MALLOC_FAILURE);
2824                                 goto psk_err;
2825                                 }
2826
2827                         if (s->session->psk_identity_hint != NULL)
2828                                 OPENSSL_free(s->session->psk_identity_hint);
2829                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2830                         if (s->ctx->psk_identity_hint != NULL &&
2831                                 s->session->psk_identity_hint == NULL)
2832                                 {
2833                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2834                                         ERR_R_MALLOC_FAILURE);
2835                                 goto psk_err;
2836                                 }
2837
2838                         s->session->master_key_length=
2839                                 s->method->ssl3_enc->generate_master_secret(s,
2840                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2841                         psk_err = 0;
2842                 psk_err:
2843                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2844                         if (psk_err != 0)
2845                                 goto f_err;
2846                         }
2847                 else
2848 #endif
2849 #ifndef OPENSSL_NO_SRP
2850                 if (alg_k & SSL_kSRP)
2851                         {
2852                         int param_len;
2853
2854                         n2s(p,i);
2855                         param_len=i+2;
2856                         if (param_len > n)
2857                                 {
2858                                 al=SSL_AD_DECODE_ERROR;
2859                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2860                                 goto f_err;
2861                                 }
2862                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2863                                 {
2864                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
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_GET_CLIENT_KEY_EXCHANGE,
2873                                         ERR_R_MALLOC_FAILURE);
2874                                 goto err;
2875                                 }
2876
2877                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2878                                 {
2879                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2880                                 goto err;
2881                                 }
2882
2883                         p+=i;
2884                         }
2885                 else
2886 #endif  /* OPENSSL_NO_SRP */
2887                 if (alg_k & SSL_kGOST) 
2888                         {
2889                         int ret = 0;
2890                         EVP_PKEY_CTX *pkey_ctx;
2891                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2892                         unsigned char premaster_secret[32], *start;
2893                         size_t outlen=32, inlen;
2894                         unsigned long alg_a;
2895
2896                         /* Get our certificate private key*/
2897                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2898                         if (alg_a & SSL_aGOST94)
2899                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2900                         else if (alg_a & SSL_aGOST01)
2901                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2902
2903                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2904                         EVP_PKEY_decrypt_init(pkey_ctx);
2905                         /* If client certificate is present and is of the same type, maybe
2906                          * use it for key exchange.  Don't mind errors from
2907                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2908                          * a client certificate for authorization only. */
2909                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2910                         if (client_pub_pkey)
2911                                 {
2912                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2913                                         ERR_clear_error();
2914                                 }
2915                         /* Decrypt session key */
2916                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2917                                 {
2918                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2919                                 goto gerr;
2920                                 }
2921                         if (p[1] == 0x81)
2922                                 {
2923                                 start = p+3;
2924                                 inlen = p[2];
2925                                 }
2926                         else if (p[1] < 0x80)
2927                                 {
2928                                 start = p+2;
2929                                 inlen = p[1];
2930                                 }