add support for use of fixed DH client certificates
[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 <openssl/crypto.h>
156 #include "ssl_locl.h"
157 #include "kssl_lcl.h"
158 #include <openssl/buffer.h>
159 #include <openssl/rand.h>
160 #include <openssl/objects.h>
161 #include <openssl/evp.h>
162 #include <openssl/hmac.h>
163 #include <openssl/x509.h>
164 #ifndef OPENSSL_NO_DH
165 #include <openssl/dh.h>
166 #endif
167 #include <openssl/bn.h>
168 #ifndef OPENSSL_NO_KRB5
169 #include <openssl/krb5_asn.h>
170 #endif
171 #include <openssl/md5.h>
172
173 static const SSL_METHOD *ssl3_get_server_method(int ver);
174
175 static const SSL_METHOD *ssl3_get_server_method(int ver)
176         {
177         if (ver == SSL3_VERSION)
178                 return(SSLv3_server_method());
179         else
180                 return(NULL);
181         }
182
183 #ifndef OPENSSL_NO_SRP
184 static int ssl_check_srp_ext_ClientHello(SSL *s,int *al)
185         {
186         int ret = SSL_ERROR_NONE;
187
188         *al = SSL_AD_UNRECOGNIZED_NAME;
189
190         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
191             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
192                 {
193                 if(s->srp_ctx.login == NULL)
194                         {
195                         /* RFC 5054 says SHOULD reject, 
196                            we do so if There is no srp login name */
197                         ret = SSL3_AL_FATAL;
198                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
199                         }
200                 else
201                         {
202                         ret = SSL_srp_server_param_with_username(s,al);
203                         }
204                 }
205         return ret;
206         }
207 #endif
208
209 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
210                         ssl3_accept,
211                         ssl_undefined_function,
212                         ssl3_get_server_method)
213
214 int ssl3_accept(SSL *s)
215         {
216         BUF_MEM *buf;
217         unsigned long alg_k,Time=(unsigned long)time(NULL);
218         void (*cb)(const SSL *ssl,int type,int val)=NULL;
219         int ret= -1;
220         int new_state,state,skip=0;
221
222         RAND_add(&Time,sizeof(Time),0);
223         ERR_clear_error();
224         clear_sys_error();
225
226         if (s->info_callback != NULL)
227                 cb=s->info_callback;
228         else if (s->ctx->info_callback != NULL)
229                 cb=s->ctx->info_callback;
230
231         /* init things to blank */
232         s->in_handshake++;
233         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
234
235         if (s->cert == NULL)
236                 {
237                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
238                 return(-1);
239                 }
240
241 #ifndef OPENSSL_NO_HEARTBEATS
242         /* If we're awaiting a HeartbeatResponse, pretend we
243          * already got and don't await it anymore, because
244          * Heartbeats don't make sense during handshakes anyway.
245          */
246         if (s->tlsext_hb_pending)
247                 {
248                 s->tlsext_hb_pending = 0;
249                 s->tlsext_hb_seq++;
250                 }
251 #endif
252
253         for (;;)
254                 {
255                 state=s->state;
256
257                 switch (s->state)
258                         {
259                 case SSL_ST_RENEGOTIATE:
260                         s->renegotiate=1;
261                         /* s->state=SSL_ST_ACCEPT; */
262
263                 case SSL_ST_BEFORE:
264                 case SSL_ST_ACCEPT:
265                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
266                 case SSL_ST_OK|SSL_ST_ACCEPT:
267
268                         s->server=1;
269                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
270
271                         if ((s->version>>8) != 3)
272                                 {
273                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
274                                 return -1;
275                                 }
276                         s->type=SSL_ST_ACCEPT;
277
278                         if (s->init_buf == NULL)
279                                 {
280                                 if ((buf=BUF_MEM_new()) == NULL)
281                                         {
282                                         ret= -1;
283                                         goto end;
284                                         }
285                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
286                                         {
287                                         ret= -1;
288                                         goto end;
289                                         }
290                                 s->init_buf=buf;
291                                 }
292
293                         if (!ssl3_setup_buffers(s))
294                                 {
295                                 ret= -1;
296                                 goto end;
297                                 }
298
299                         s->init_num=0;
300                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
301                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
302
303                         if (s->state != SSL_ST_RENEGOTIATE)
304                                 {
305                                 /* Ok, we now need to push on a buffering BIO so that
306                                  * the output is sent in a way that TCP likes :-)
307                                  */
308                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
309                                 
310                                 ssl3_init_finished_mac(s);
311                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
312                                 s->ctx->stats.sess_accept++;
313                                 }
314                         else if (!s->s3->send_connection_binding &&
315                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
316                                 {
317                                 /* Server attempting to renegotiate with
318                                  * client that doesn't support secure
319                                  * renegotiation.
320                                  */
321                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
322                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
323                                 ret = -1;
324                                 goto end;
325                                 }
326                         else
327                                 {
328                                 /* s->state == SSL_ST_RENEGOTIATE,
329                                  * we will just send a HelloRequest */
330                                 s->ctx->stats.sess_accept_renegotiate++;
331                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
332                                 }
333                         break;
334
335                 case SSL3_ST_SW_HELLO_REQ_A:
336                 case SSL3_ST_SW_HELLO_REQ_B:
337
338                         s->shutdown=0;
339                         ret=ssl3_send_hello_request(s);
340                         if (ret <= 0) goto end;
341                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
342                         s->state=SSL3_ST_SW_FLUSH;
343                         s->init_num=0;
344
345                         ssl3_init_finished_mac(s);
346                         break;
347
348                 case SSL3_ST_SW_HELLO_REQ_C:
349                         s->state=SSL_ST_OK;
350                         break;
351
352                 case SSL3_ST_SR_CLNT_HELLO_A:
353                 case SSL3_ST_SR_CLNT_HELLO_B:
354                 case SSL3_ST_SR_CLNT_HELLO_C:
355
356                         if (s->rwstate != SSL_X509_LOOKUP)
357                         {
358                                 ret=ssl3_get_client_hello(s);
359                                 if (ret <= 0) goto end;
360                         }
361 #ifndef OPENSSL_NO_SRP
362                         {
363                         int al;
364                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
365                                         {
366                                         /* callback indicates firther work to be done */
367                                         s->rwstate=SSL_X509_LOOKUP;
368                                         goto end;
369                                         }
370                         if (ret != SSL_ERROR_NONE)
371                                 {
372                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);    
373                                 /* This is not really an error but the only means to
374                                    for a client to detect whether srp is supported. */
375                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)      
376                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);                     
377                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;                       
378                                 ret= -1;
379                                 goto end;       
380                                 }
381                         }
382 #endif          
383                         
384                         s->renegotiate = 2;
385                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
386                         s->init_num=0;
387                         break;
388
389                 case SSL3_ST_SW_SRVR_HELLO_A:
390                 case SSL3_ST_SW_SRVR_HELLO_B:
391                         ret=ssl3_send_server_hello(s);
392                         if (ret <= 0) goto end;
393 #ifndef OPENSSL_NO_TLSEXT
394                         if (s->hit)
395                                 {
396                                 if (s->tlsext_ticket_expected)
397                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
398                                 else
399                                         s->state=SSL3_ST_SW_CHANGE_A;
400                                 }
401 #else
402                         if (s->hit)
403                                         s->state=SSL3_ST_SW_CHANGE_A;
404 #endif
405                         else
406                                 s->state=SSL3_ST_SW_CERT_A;
407                         s->init_num=0;
408                         break;
409
410                 case SSL3_ST_SW_CERT_A:
411                 case SSL3_ST_SW_CERT_B:
412                         /* Check if it is anon DH or anon ECDH, */
413                         /* normal PSK or KRB5 or SRP */
414                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
415                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
416                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
417                                 {
418                                 ret=ssl3_send_server_certificate(s);
419                                 if (ret <= 0) goto end;
420 #ifndef OPENSSL_NO_TLSEXT
421                                 if (s->tlsext_status_expected)
422                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
423                                 else
424                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
425                                 }
426                         else
427                                 {
428                                 skip = 1;
429                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
430                                 }
431 #else
432                                 }
433                         else
434                                 skip=1;
435
436                         s->state=SSL3_ST_SW_KEY_EXCH_A;
437 #endif
438                         s->init_num=0;
439                         break;
440
441                 case SSL3_ST_SW_KEY_EXCH_A:
442                 case SSL3_ST_SW_KEY_EXCH_B:
443                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
444
445                         /* clear this, it may get reset by
446                          * send_server_key_exchange */
447                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
448 #ifndef OPENSSL_NO_KRB5
449                                 && !(alg_k & SSL_kKRB5)
450 #endif /* OPENSSL_NO_KRB5 */
451                                 )
452                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
453                                  * even when forbidden by protocol specs
454                                  * (handshake may fail as clients are not required to
455                                  * be able to handle this) */
456                                 s->s3->tmp.use_rsa_tmp=1;
457                         else
458                                 s->s3->tmp.use_rsa_tmp=0;
459
460
461                         /* only send if a DH key exchange, fortezza or
462                          * RSA but we have a sign only certificate
463                          *
464                          * PSK: may send PSK identity hints
465                          *
466                          * For ECC ciphersuites, we send a serverKeyExchange
467                          * message only if the cipher suite is either
468                          * ECDH-anon or ECDHE. In other cases, the
469                          * server certificate contains the server's
470                          * public key for key exchange.
471                          */
472                         if (s->s3->tmp.use_rsa_tmp
473                         /* PSK: send ServerKeyExchange if PSK identity
474                          * hint if provided */
475 #ifndef OPENSSL_NO_PSK
476                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
477 #endif
478 #ifndef OPENSSL_NO_SRP
479                             /* SRP: send ServerKeyExchange */
480                             || (alg_k & SSL_kSRP)
481 #endif
482                             || (alg_k & SSL_kEDH)
483                             || (alg_k & SSL_kEECDH)
484                             || ((alg_k & SSL_kRSA)
485                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
486                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
487                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
488                                         )
489                                     )
490                                 )
491                             )
492                                 {
493                                 ret=ssl3_send_server_key_exchange(s);
494                                 if (ret <= 0) goto end;
495                                 }
496                         else
497                                 skip=1;
498
499                         s->state=SSL3_ST_SW_CERT_REQ_A;
500                         s->init_num=0;
501                         break;
502
503                 case SSL3_ST_SW_CERT_REQ_A:
504                 case SSL3_ST_SW_CERT_REQ_B:
505                         if (/* don't request cert unless asked for it: */
506                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
507                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
508                                  * don't request cert during re-negotiation: */
509                                 ((s->session->peer != NULL) &&
510                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
511                                 /* never request cert in anonymous ciphersuites
512                                  * (see section "Certificate request" in SSL 3 drafts
513                                  * and in RFC 2246): */
514                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
515                                  /* ... except when the application insists on verification
516                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
517                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
518                                  /* never request cert in Kerberos ciphersuites */
519                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
520                                 /* With normal PSK Certificates and
521                                  * Certificate Requests are omitted */
522                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
523                                 {
524                                 /* no cert request */
525                                 skip=1;
526                                 s->s3->tmp.cert_request=0;
527                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
528                                 if (s->s3->handshake_buffer)
529                                         if (!ssl3_digest_cached_records(s))
530                                                 return -1;
531                                 }
532                         else
533                                 {
534                                 s->s3->tmp.cert_request=1;
535                                 ret=ssl3_send_certificate_request(s);
536                                 if (ret <= 0) goto end;
537 #ifndef NETSCAPE_HANG_BUG
538                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
539 #else
540                                 s->state=SSL3_ST_SW_FLUSH;
541                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
542 #endif
543                                 s->init_num=0;
544                                 }
545                         break;
546
547                 case SSL3_ST_SW_SRVR_DONE_A:
548                 case SSL3_ST_SW_SRVR_DONE_B:
549                         ret=ssl3_send_server_done(s);
550                         if (ret <= 0) goto end;
551                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
552                         s->state=SSL3_ST_SW_FLUSH;
553                         s->init_num=0;
554                         break;
555                 
556                 case SSL3_ST_SW_FLUSH:
557
558                         /* This code originally checked to see if
559                          * any data was pending using BIO_CTRL_INFO
560                          * and then flushed. This caused problems
561                          * as documented in PR#1939. The proposed
562                          * fix doesn't completely resolve this issue
563                          * as buggy implementations of BIO_CTRL_PENDING
564                          * still exist. So instead we just flush
565                          * unconditionally.
566                          */
567
568                         s->rwstate=SSL_WRITING;
569                         if (BIO_flush(s->wbio) <= 0)
570                                 {
571                                 ret= -1;
572                                 goto end;
573                                 }
574                         s->rwstate=SSL_NOTHING;
575
576                         s->state=s->s3->tmp.next_state;
577                         break;
578
579                 case SSL3_ST_SR_CERT_A:
580                 case SSL3_ST_SR_CERT_B:
581                         /* Check for second client hello (MS SGC) */
582                         ret = ssl3_check_client_hello(s);
583                         if (ret <= 0)
584                                 goto end;
585                         if (ret == 2)
586                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
587                         else {
588                                 if (s->s3->tmp.cert_request)
589                                         {
590                                         ret=ssl3_get_client_certificate(s);
591                                         if (ret <= 0) goto end;
592                                         }
593                                 s->init_num=0;
594                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
595                         }
596                         break;
597
598                 case SSL3_ST_SR_KEY_EXCH_A:
599                 case SSL3_ST_SR_KEY_EXCH_B:
600                         ret=ssl3_get_client_key_exchange(s);
601                         if (ret <= 0)
602                                 goto end;
603                         if (ret == 2)
604                                 {
605                                 /* For the ECDH ciphersuites when
606                                  * the client sends its ECDH pub key in
607                                  * a certificate, the CertificateVerify
608                                  * message is not sent.
609                                  * Also for GOST ciphersuites when
610                                  * the client uses its key from the certificate
611                                  * for key exchange.
612                                  */
613 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
614                                 s->state=SSL3_ST_SR_FINISHED_A;
615 #else
616                                 if (s->s3->next_proto_neg_seen)
617                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
618                                 else
619                                         s->state=SSL3_ST_SR_FINISHED_A;
620 #endif
621                                 s->init_num = 0;
622                                 }
623                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
624                                 {
625                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
626                                 s->init_num=0;
627                                 if (!s->session->peer)
628                                         break;
629                                 /* For TLS v1.2 freeze the handshake buffer
630                                  * at this point and digest cached records.
631                                  */
632                                 if (!s->s3->handshake_buffer)
633                                         {
634                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
635                                         return -1;
636                                         }
637                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
638                                 if (!ssl3_digest_cached_records(s))
639                                         return -1;
640                                 }
641                         else
642                                 {
643                                 int offset=0;
644                                 int dgst_num;
645
646                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
647                                 s->init_num=0;
648
649                                 /* We need to get hashes here so if there is
650                                  * a client cert, it can be verified
651                                  * FIXME - digest processing for CertificateVerify
652                                  * should be generalized. But it is next step
653                                  */
654                                 if (s->s3->handshake_buffer)
655                                         if (!ssl3_digest_cached_records(s))
656                                                 return -1;
657                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
658                                         if (s->s3->handshake_dgst[dgst_num]) 
659                                                 {
660                                                 int dgst_size;
661
662                                                 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]));
663                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
664                                                 if (dgst_size < 0)
665                                                         {
666                                                         ret = -1;
667                                                         goto end;
668                                                         }
669                                                 offset+=dgst_size;
670                                                 }               
671                                 }
672                         break;
673
674                 case SSL3_ST_SR_CERT_VRFY_A:
675                 case SSL3_ST_SR_CERT_VRFY_B:
676
677                         /* we should decide if we expected this one */
678                         ret=ssl3_get_cert_verify(s);
679                         if (ret <= 0) goto end;
680
681 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
682                         s->state=SSL3_ST_SR_FINISHED_A;
683 #else
684                         if (s->s3->next_proto_neg_seen)
685                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
686                         else
687                                 s->state=SSL3_ST_SR_FINISHED_A;
688 #endif
689                         s->init_num=0;
690                         break;
691
692 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
693                 case SSL3_ST_SR_NEXT_PROTO_A:
694                 case SSL3_ST_SR_NEXT_PROTO_B:
695                         ret=ssl3_get_next_proto(s);
696                         if (ret <= 0) goto end;
697                         s->init_num = 0;
698                         s->state=SSL3_ST_SR_FINISHED_A;
699                         break;
700 #endif
701
702                 case SSL3_ST_SR_FINISHED_A:
703                 case SSL3_ST_SR_FINISHED_B:
704                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
705                                 SSL3_ST_SR_FINISHED_B);
706                         if (ret <= 0) goto end;
707                         if (s->hit)
708                                 s->state=SSL_ST_OK;
709 #ifndef OPENSSL_NO_TLSEXT
710                         else if (s->tlsext_ticket_expected)
711                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
712 #endif
713                         else
714                                 s->state=SSL3_ST_SW_CHANGE_A;
715                         s->init_num=0;
716                         break;
717
718 #ifndef OPENSSL_NO_TLSEXT
719                 case SSL3_ST_SW_SESSION_TICKET_A:
720                 case SSL3_ST_SW_SESSION_TICKET_B:
721                         ret=ssl3_send_newsession_ticket(s);
722                         if (ret <= 0) goto end;
723                         s->state=SSL3_ST_SW_CHANGE_A;
724                         s->init_num=0;
725                         break;
726
727                 case SSL3_ST_SW_CERT_STATUS_A:
728                 case SSL3_ST_SW_CERT_STATUS_B:
729                         ret=ssl3_send_cert_status(s);
730                         if (ret <= 0) goto end;
731                         s->state=SSL3_ST_SW_KEY_EXCH_A;
732                         s->init_num=0;
733                         break;
734
735 #endif
736
737                 case SSL3_ST_SW_CHANGE_A:
738                 case SSL3_ST_SW_CHANGE_B:
739
740                         s->session->cipher=s->s3->tmp.new_cipher;
741                         if (!s->method->ssl3_enc->setup_key_block(s))
742                                 { ret= -1; goto end; }
743
744                         ret=ssl3_send_change_cipher_spec(s,
745                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
746
747                         if (ret <= 0) goto end;
748                         s->state=SSL3_ST_SW_FINISHED_A;
749                         s->init_num=0;
750
751                         if (!s->method->ssl3_enc->change_cipher_state(s,
752                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
753                                 {
754                                 ret= -1;
755                                 goto end;
756                                 }
757
758                         break;
759
760                 case SSL3_ST_SW_FINISHED_A:
761                 case SSL3_ST_SW_FINISHED_B:
762                         ret=ssl3_send_finished(s,
763                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
764                                 s->method->ssl3_enc->server_finished_label,
765                                 s->method->ssl3_enc->server_finished_label_len);
766                         if (ret <= 0) goto end;
767                         s->state=SSL3_ST_SW_FLUSH;
768                         if (s->hit)
769                                 {
770 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
771                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
772 #else
773                                 if (s->s3->next_proto_neg_seen)
774                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
775                                 else
776                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
777 #endif
778                                 }
779                         else
780                                 s->s3->tmp.next_state=SSL_ST_OK;
781                         s->init_num=0;
782                         break;
783
784                 case SSL_ST_OK:
785                         /* clean a few things up */
786                         ssl3_cleanup_key_block(s);
787
788                         BUF_MEM_free(s->init_buf);
789                         s->init_buf=NULL;
790
791                         /* remove buffering on output */
792                         ssl_free_wbio_buffer(s);
793
794                         s->init_num=0;
795
796                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
797                                 {
798                                 s->renegotiate=0;
799                                 s->new_session=0;
800                                 
801                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
802                                 
803                                 s->ctx->stats.sess_accept_good++;
804                                 /* s->server=1; */
805                                 s->handshake_func=ssl3_accept;
806
807                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
808                                 }
809                         
810                         ret = 1;
811                         goto end;
812                         /* break; */
813
814                 default:
815                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
816                         ret= -1;
817                         goto end;
818                         /* break; */
819                         }
820                 
821                 if (!s->s3->tmp.reuse_message && !skip)
822                         {
823                         if (s->debug)
824                                 {
825                                 if ((ret=BIO_flush(s->wbio)) <= 0)
826                                         goto end;
827                                 }
828
829
830                         if ((cb != NULL) && (s->state != state))
831                                 {
832                                 new_state=s->state;
833                                 s->state=state;
834                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
835                                 s->state=new_state;
836                                 }
837                         }
838                 skip=0;
839                 }
840 end:
841         /* BIO_flush(s->wbio); */
842
843         s->in_handshake--;
844         if (cb != NULL)
845                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
846         return(ret);
847         }
848
849 int ssl3_send_hello_request(SSL *s)
850         {
851         unsigned char *p;
852
853         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
854                 {
855                 p=(unsigned char *)s->init_buf->data;
856                 *(p++)=SSL3_MT_HELLO_REQUEST;
857                 *(p++)=0;
858                 *(p++)=0;
859                 *(p++)=0;
860
861                 s->state=SSL3_ST_SW_HELLO_REQ_B;
862                 /* number of bytes to write */
863                 s->init_num=4;
864                 s->init_off=0;
865                 }
866
867         /* SSL3_ST_SW_HELLO_REQ_B */
868         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
869         }
870
871 int ssl3_check_client_hello(SSL *s)
872         {
873         int ok;
874         long n;
875
876         /* We only allow the client to restart the handshake once per
877          * negotiation. */
878         if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
879                 {
880                 SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
881                 return -1;
882                 }
883
884         /* this function is called when we really expect a Certificate message,
885          * so permit appropriate message length */
886         n=s->method->ssl_get_message(s,
887                 SSL3_ST_SR_CERT_A,
888                 SSL3_ST_SR_CERT_B,
889                 -1,
890                 s->max_cert_list,
891                 &ok);
892         if (!ok) return((int)n);
893         s->s3->tmp.reuse_message = 1;
894         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
895                 {
896                 /* Throw away what we have done so far in the current handshake,
897                  * which will now be aborted. (A full SSL_clear would be too much.) */
898 #ifndef OPENSSL_NO_DH
899                 if (s->s3->tmp.dh != NULL)
900                         {
901                         DH_free(s->s3->tmp.dh);
902                         s->s3->tmp.dh = NULL;
903                         }
904 #endif
905 #ifndef OPENSSL_NO_ECDH
906                 if (s->s3->tmp.ecdh != NULL)
907                         {
908                         EC_KEY_free(s->s3->tmp.ecdh);
909                         s->s3->tmp.ecdh = NULL;
910                         }
911 #endif
912                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
913                 return 2;
914                 }
915         return 1;
916 }
917
918 int ssl3_get_client_hello(SSL *s)
919         {
920         int i,j,ok,al,ret= -1;
921         unsigned int cookie_len;
922         long n;
923         unsigned long id;
924         unsigned char *p,*d,*q;
925         SSL_CIPHER *c;
926 #ifndef OPENSSL_NO_COMP
927         SSL_COMP *comp=NULL;
928 #endif
929         STACK_OF(SSL_CIPHER) *ciphers=NULL;
930
931         /* We do this so that we will respond with our native type.
932          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
933          * This down switching should be handled by a different method.
934          * If we are SSLv3, we will respond with SSLv3, even if prompted with
935          * TLSv1.
936          */
937         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
938                 )
939                 {
940                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
941                 }
942         s->first_packet=1;
943         n=s->method->ssl_get_message(s,
944                 SSL3_ST_SR_CLNT_HELLO_B,
945                 SSL3_ST_SR_CLNT_HELLO_C,
946                 SSL3_MT_CLIENT_HELLO,
947                 SSL3_RT_MAX_PLAIN_LENGTH,
948                 &ok);
949
950         if (!ok) return((int)n);
951         s->first_packet=0;
952         d=p=(unsigned char *)s->init_msg;
953
954         /* use version from inside client hello, not from record header
955          * (may differ: see RFC 2246, Appendix E, second paragraph) */
956         s->client_version=(((int)p[0])<<8)|(int)p[1];
957         p+=2;
958
959         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
960             (s->version != DTLS1_VERSION && s->client_version < s->version))
961                 {
962                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
963                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
964                         {
965                         /* similar to ssl3_get_record, send alert using remote version number */
966                         s->version = s->client_version;
967                         }
968                 al = SSL_AD_PROTOCOL_VERSION;
969                 goto f_err;
970                 }
971
972         /* If we require cookies and this ClientHello doesn't
973          * contain one, just return since we do not want to
974          * allocate any memory yet. So check cookie length...
975          */
976         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
977                 {
978                 unsigned int session_length, cookie_length;
979                 
980                 session_length = *(p + SSL3_RANDOM_SIZE);
981                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
982
983                 if (cookie_length == 0)
984                         return 1;
985                 }
986
987         /* load the client random */
988         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
989         p+=SSL3_RANDOM_SIZE;
990
991         /* get the session-id */
992         j= *(p++);
993
994         s->hit=0;
995         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
996          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
997          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
998          * than a change to default behavior so that applications relying on this for security
999          * won't even compile against older library versions).
1000          *
1001          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1002          * renegotiation but not a new session (s->new_session remains unset): for servers,
1003          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1004          * setting will be ignored.
1005          */
1006         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1007                 {
1008                 if (!ssl_get_new_session(s,1))
1009                         goto err;
1010                 }
1011         else
1012                 {
1013                 i=ssl_get_prev_session(s, p, j, d + n);
1014                 if (i == 1)
1015                         { /* previous session */
1016                         s->hit=1;
1017                         }
1018                 else if (i == -1)
1019                         goto err;
1020                 else /* i == 0 */
1021                         {
1022                         if (!ssl_get_new_session(s,1))
1023                                 goto err;
1024                         }
1025                 }
1026
1027         p+=j;
1028
1029         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1030                 {
1031                 /* cookie stuff */
1032                 cookie_len = *(p++);
1033
1034                 /* 
1035                  * The ClientHello may contain a cookie even if the
1036                  * HelloVerify message has not been sent--make sure that it
1037                  * does not cause an overflow.
1038                  */
1039                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1040                         {
1041                         /* too much data */
1042                         al = SSL_AD_DECODE_ERROR;
1043                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1044                         goto f_err;
1045                         }
1046
1047                 /* verify the cookie if appropriate option is set. */
1048                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1049                         cookie_len > 0)
1050                         {
1051                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1052
1053                         if ( s->ctx->app_verify_cookie_cb != NULL)
1054                                 {
1055                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1056                                         cookie_len) == 0)
1057                                         {
1058                                         al=SSL_AD_HANDSHAKE_FAILURE;
1059                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1060                                                 SSL_R_COOKIE_MISMATCH);
1061                                         goto f_err;
1062                                         }
1063                                 /* else cookie verification succeeded */
1064                                 }
1065                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1066                                                   s->d1->cookie_len) != 0) /* default verification */
1067                                 {
1068                                         al=SSL_AD_HANDSHAKE_FAILURE;
1069                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1070                                                 SSL_R_COOKIE_MISMATCH);
1071                                         goto f_err;
1072                                 }
1073
1074                         ret = 2;
1075                         }
1076
1077                 p += cookie_len;
1078                 }
1079
1080         n2s(p,i);
1081         if ((i == 0) && (j != 0))
1082                 {
1083                 /* we need a cipher if we are not resuming a session */
1084                 al=SSL_AD_ILLEGAL_PARAMETER;
1085                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1086                 goto f_err;
1087                 }
1088         if ((p+i) >= (d+n))
1089                 {
1090                 /* not enough data */
1091                 al=SSL_AD_DECODE_ERROR;
1092                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1093                 goto f_err;
1094                 }
1095         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1096                 == NULL))
1097                 {
1098                 goto err;
1099                 }
1100         p+=i;
1101
1102         /* If it is a hit, check that the cipher is in the list */
1103         if ((s->hit) && (i > 0))
1104                 {
1105                 j=0;
1106                 id=s->session->cipher->id;
1107
1108 #ifdef CIPHER_DEBUG
1109                 printf("client sent %d ciphers\n",sk_num(ciphers));
1110 #endif
1111                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1112                         {
1113                         c=sk_SSL_CIPHER_value(ciphers,i);
1114 #ifdef CIPHER_DEBUG
1115                         printf("client [%2d of %2d]:%s\n",
1116                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1117 #endif
1118                         if (c->id == id)
1119                                 {
1120                                 j=1;
1121                                 break;
1122                                 }
1123                         }
1124 /* Disabled because it can be used in a ciphersuite downgrade
1125  * attack: CVE-2010-4180.
1126  */
1127 #if 0
1128                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1129                         {
1130                         /* Special case as client bug workaround: the previously used cipher may
1131                          * not be in the current list, the client instead might be trying to
1132                          * continue using a cipher that before wasn't chosen due to server
1133                          * preferences.  We'll have to reject the connection if the cipher is not
1134                          * enabled, though. */
1135                         c = sk_SSL_CIPHER_value(ciphers, 0);
1136                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1137                                 {
1138                                 s->session->cipher = c;
1139                                 j = 1;
1140                                 }
1141                         }
1142 #endif
1143                 if (j == 0)
1144                         {
1145                         /* we need to have the cipher in the cipher
1146                          * list if we are asked to reuse it */
1147                         al=SSL_AD_ILLEGAL_PARAMETER;
1148                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1149                         goto f_err;
1150                         }
1151                 }
1152
1153         /* compression */
1154         i= *(p++);
1155         if ((p+i) > (d+n))
1156                 {
1157                 /* not enough data */
1158                 al=SSL_AD_DECODE_ERROR;
1159                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1160                 goto f_err;
1161                 }
1162         q=p;
1163         for (j=0; j<i; j++)
1164                 {
1165                 if (p[j] == 0) break;
1166                 }
1167
1168         p+=i;
1169         if (j >= i)
1170                 {
1171                 /* no compress */
1172                 al=SSL_AD_DECODE_ERROR;
1173                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1174                 goto f_err;
1175                 }
1176
1177 #ifndef OPENSSL_NO_TLSEXT
1178         /* TLS extensions*/
1179         if (s->version >= SSL3_VERSION)
1180                 {
1181                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1182                         {
1183                         /* 'al' set by ssl_parse_clienthello_tlsext */
1184                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1185                         goto f_err;
1186                         }
1187                 }
1188                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1189                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1190                         goto err;
1191                 }
1192
1193         /* Check if we want to use external pre-shared secret for this
1194          * handshake for not reused session only. We need to generate
1195          * server_random before calling tls_session_secret_cb in order to allow
1196          * SessionTicket processing to use it in key derivation. */
1197         {
1198                 unsigned long Time;
1199                 unsigned char *pos;
1200                 Time=(unsigned long)time(NULL);                 /* Time */
1201                 pos=s->s3->server_random;
1202                 l2n(Time,pos);
1203                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1204                         {
1205                         al=SSL_AD_INTERNAL_ERROR;
1206                         goto f_err;
1207                         }
1208         }
1209
1210         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1211                 {
1212                 SSL_CIPHER *pref_cipher=NULL;
1213
1214                 s->session->master_key_length=sizeof(s->session->master_key);
1215                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1216                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1217                         {
1218                         s->hit=1;
1219                         s->session->ciphers=ciphers;
1220                         s->session->verify_result=X509_V_OK;
1221
1222                         ciphers=NULL;
1223
1224                         /* check if some cipher was preferred by call back */
1225                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1226                         if (pref_cipher == NULL)
1227                                 {
1228                                 al=SSL_AD_HANDSHAKE_FAILURE;
1229                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1230                                 goto f_err;
1231                                 }
1232
1233                         s->session->cipher=pref_cipher;
1234
1235                         if (s->cipher_list)
1236                                 sk_SSL_CIPHER_free(s->cipher_list);
1237
1238                         if (s->cipher_list_by_id)
1239                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1240
1241                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1242                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1243                         }
1244                 }
1245 #endif
1246
1247         /* Worst case, we will use the NULL compression, but if we have other
1248          * options, we will now look for them.  We have i-1 compression
1249          * algorithms from the client, starting at q. */
1250         s->s3->tmp.new_compression=NULL;
1251 #ifndef OPENSSL_NO_COMP
1252         /* This only happens if we have a cache hit */
1253         if (s->session->compress_meth != 0)
1254                 {
1255                 int m, comp_id = s->session->compress_meth;
1256                 /* Perform sanity checks on resumed compression algorithm */
1257                 /* Can't disable compression */
1258                 if (s->options & SSL_OP_NO_COMPRESSION)
1259                         {
1260                         al=SSL_AD_INTERNAL_ERROR;
1261                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1262                         goto f_err;
1263                         }
1264                 /* Look for resumed compression method */
1265                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1266                         {
1267                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1268                         if (comp_id == comp->id)
1269                                 {
1270                                 s->s3->tmp.new_compression=comp;
1271                                 break;
1272                                 }
1273                         }
1274                 if (s->s3->tmp.new_compression == NULL)
1275                         {
1276                         al=SSL_AD_INTERNAL_ERROR;
1277                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1278                         goto f_err;
1279                         }
1280                 /* Look for resumed method in compression list */
1281                 for (m = 0; m < i; m++)
1282                         {
1283                         if (q[m] == comp_id)
1284                                 break;
1285                         }
1286                 if (m >= i)
1287                         {
1288                         al=SSL_AD_ILLEGAL_PARAMETER;
1289                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1290                         goto f_err;
1291                         }
1292                 }
1293         else if (s->hit)
1294                 comp = NULL;
1295         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1296                 { /* See if we have a match */
1297                 int m,nn,o,v,done=0;
1298
1299                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1300                 for (m=0; m<nn; m++)
1301                         {
1302                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1303                         v=comp->id;
1304                         for (o=0; o<i; o++)
1305                                 {
1306                                 if (v == q[o])
1307                                         {
1308                                         done=1;
1309                                         break;
1310                                         }
1311                                 }
1312                         if (done) break;
1313                         }
1314                 if (done)
1315                         s->s3->tmp.new_compression=comp;
1316                 else
1317                         comp=NULL;
1318                 }
1319 #else
1320         /* If compression is disabled we'd better not try to resume a session
1321          * using compression.
1322          */
1323         if (s->session->compress_meth != 0)
1324                 {
1325                 al=SSL_AD_INTERNAL_ERROR;
1326                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1327                 goto f_err;
1328                 }
1329 #endif
1330
1331         /* Given s->session->ciphers and SSL_get_ciphers, we must
1332          * pick a cipher */
1333
1334         if (!s->hit)
1335                 {
1336 #ifdef OPENSSL_NO_COMP
1337                 s->session->compress_meth=0;
1338 #else
1339                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1340 #endif
1341                 if (s->session->ciphers != NULL)
1342                         sk_SSL_CIPHER_free(s->session->ciphers);
1343                 s->session->ciphers=ciphers;
1344                 if (ciphers == NULL)
1345                         {
1346                         al=SSL_AD_ILLEGAL_PARAMETER;
1347                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1348                         goto f_err;
1349                         }
1350                 ciphers=NULL;
1351                 c=ssl3_choose_cipher(s,s->session->ciphers,
1352                                      SSL_get_ciphers(s));
1353
1354                 if (c == NULL)
1355                         {
1356                         al=SSL_AD_HANDSHAKE_FAILURE;
1357                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1358                         goto f_err;
1359                         }
1360                 s->s3->tmp.new_cipher=c;
1361                 /* check whether we should disable session resumption */
1362                 if (s->not_resumable_session_cb != NULL)
1363                         s->session->not_resumable=s->not_resumable_session_cb(s,
1364                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1365                 if (s->session->not_resumable)
1366                         /* do not send a session ticket */
1367                         s->tlsext_ticket_expected = 0;
1368                 }
1369         else
1370                 {
1371                 /* Session-id reuse */
1372 #ifdef REUSE_CIPHER_BUG
1373                 STACK_OF(SSL_CIPHER) *sk;
1374                 SSL_CIPHER *nc=NULL;
1375                 SSL_CIPHER *ec=NULL;
1376
1377                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1378                         {
1379                         sk=s->session->ciphers;
1380                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1381                                 {
1382                                 c=sk_SSL_CIPHER_value(sk,i);
1383                                 if (c->algorithm_enc & SSL_eNULL)
1384                                         nc=c;
1385                                 if (SSL_C_IS_EXPORT(c))
1386                                         ec=c;
1387                                 }
1388                         if (nc != NULL)
1389                                 s->s3->tmp.new_cipher=nc;
1390                         else if (ec != NULL)
1391                                 s->s3->tmp.new_cipher=ec;
1392                         else
1393                                 s->s3->tmp.new_cipher=s->session->cipher;
1394                         }
1395                 else
1396 #endif
1397                 s->s3->tmp.new_cipher=s->session->cipher;
1398                 }
1399
1400         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1401                 {
1402                 if (!ssl3_digest_cached_records(s))
1403                         goto f_err;
1404                 }
1405         
1406         /* we now have the following setup. 
1407          * client_random
1408          * cipher_list          - our prefered list of ciphers
1409          * ciphers              - the clients prefered list of ciphers
1410          * compression          - basically ignored right now
1411          * ssl version is set   - sslv3
1412          * s->session           - The ssl session has been setup.
1413          * s->hit               - session reuse flag
1414          * s->tmp.new_cipher    - the new cipher to use.
1415          */
1416
1417         if (ret < 0) ret=1;
1418         if (0)
1419                 {
1420 f_err:
1421                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1422                 }
1423 err:
1424         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1425         return(ret);
1426         }
1427
1428 int ssl3_send_server_hello(SSL *s)
1429         {
1430         unsigned char *buf;
1431         unsigned char *p,*d;
1432         int i,sl;
1433         unsigned long l;
1434 #ifdef OPENSSL_NO_TLSEXT
1435         unsigned long Time;
1436 #endif
1437
1438         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1439                 {
1440                 buf=(unsigned char *)s->init_buf->data;
1441 #ifdef OPENSSL_NO_TLSEXT
1442                 p=s->s3->server_random;
1443                 /* Generate server_random if it was not needed previously */
1444                 Time=(unsigned long)time(NULL);                 /* Time */
1445                 l2n(Time,p);
1446                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1447                         return -1;
1448 #endif
1449                 /* Do the message type and length last */
1450                 d=p= &(buf[4]);
1451
1452                 *(p++)=s->version>>8;
1453                 *(p++)=s->version&0xff;
1454
1455                 /* Random stuff */
1456                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1457                 p+=SSL3_RANDOM_SIZE;
1458
1459                 /* There are several cases for the session ID to send
1460                  * back in the server hello:
1461                  * - For session reuse from the session cache,
1462                  *   we send back the old session ID.
1463                  * - If stateless session reuse (using a session ticket)
1464                  *   is successful, we send back the client's "session ID"
1465                  *   (which doesn't actually identify the session).
1466                  * - If it is a new session, we send back the new
1467                  *   session ID.
1468                  * - However, if we want the new session to be single-use,
1469                  *   we send back a 0-length session ID.
1470                  * s->hit is non-zero in either case of session reuse,
1471                  * so the following won't overwrite an ID that we're supposed
1472                  * to send back.
1473                  */
1474                 if (s->session->not_resumable ||
1475                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1476                                 && !s->hit))
1477                         s->session->session_id_length=0;
1478
1479                 sl=s->session->session_id_length;
1480                 if (sl > (int)sizeof(s->session->session_id))
1481                         {
1482                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1483                         return -1;
1484                         }
1485                 *(p++)=sl;
1486                 memcpy(p,s->session->session_id,sl);
1487                 p+=sl;
1488
1489                 /* put the cipher */
1490                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1491                 p+=i;
1492
1493                 /* put the compression method */
1494 #ifdef OPENSSL_NO_COMP
1495                         *(p++)=0;
1496 #else
1497                 if (s->s3->tmp.new_compression == NULL)
1498                         *(p++)=0;
1499                 else
1500                         *(p++)=s->s3->tmp.new_compression->id;
1501 #endif
1502 #ifndef OPENSSL_NO_TLSEXT
1503                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1504                         {
1505                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1506                         return -1;
1507                         }
1508                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1509                         {
1510                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1511                         return -1;
1512                         }
1513 #endif
1514                 /* do the header */
1515                 l=(p-d);
1516                 d=buf;
1517                 *(d++)=SSL3_MT_SERVER_HELLO;
1518                 l2n3(l,d);
1519
1520                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1521                 /* number of bytes to write */
1522                 s->init_num=p-buf;
1523                 s->init_off=0;
1524                 }
1525
1526         /* SSL3_ST_SW_SRVR_HELLO_B */
1527         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1528         }
1529
1530 int ssl3_send_server_done(SSL *s)
1531         {
1532         unsigned char *p;
1533
1534         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1535                 {
1536                 p=(unsigned char *)s->init_buf->data;
1537
1538                 /* do the header */
1539                 *(p++)=SSL3_MT_SERVER_DONE;
1540                 *(p++)=0;
1541                 *(p++)=0;
1542                 *(p++)=0;
1543
1544                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1545                 /* number of bytes to write */
1546                 s->init_num=4;
1547                 s->init_off=0;
1548                 }
1549
1550         /* SSL3_ST_SW_SRVR_DONE_B */
1551         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1552         }
1553
1554 int ssl3_send_server_key_exchange(SSL *s)
1555         {
1556 #ifndef OPENSSL_NO_RSA
1557         unsigned char *q;
1558         int j,num;
1559         RSA *rsa;
1560         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1561         unsigned int u;
1562 #endif
1563 #ifndef OPENSSL_NO_DH
1564         DH *dh=NULL,*dhp;
1565 #endif
1566 #ifndef OPENSSL_NO_ECDH
1567         EC_KEY *ecdh=NULL, *ecdhp;
1568         unsigned char *encodedPoint = NULL;
1569         int encodedlen = 0;
1570         int curve_id = 0;
1571         BN_CTX *bn_ctx = NULL; 
1572 #endif
1573         EVP_PKEY *pkey;
1574         const EVP_MD *md = NULL;
1575         unsigned char *p,*d;
1576         int al,i;
1577         unsigned long type;
1578         int n;
1579         CERT *cert;
1580         BIGNUM *r[4];
1581         int nr[4],kn;
1582         BUF_MEM *buf;
1583         EVP_MD_CTX md_ctx;
1584
1585         EVP_MD_CTX_init(&md_ctx);
1586         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1587                 {
1588                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1589                 cert=s->cert;
1590
1591                 buf=s->init_buf;
1592
1593                 r[0]=r[1]=r[2]=r[3]=NULL;
1594                 n=0;
1595 #ifndef OPENSSL_NO_RSA
1596                 if (type & SSL_kRSA)
1597                         {
1598                         rsa=cert->rsa_tmp;
1599                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1600                                 {
1601                                 rsa=s->cert->rsa_tmp_cb(s,
1602                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1603                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1604                                 if(rsa == NULL)
1605                                 {
1606                                         al=SSL_AD_HANDSHAKE_FAILURE;
1607                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1608                                         goto f_err;
1609                                 }
1610                                 RSA_up_ref(rsa);
1611                                 cert->rsa_tmp=rsa;
1612                                 }
1613                         if (rsa == NULL)
1614                                 {
1615                                 al=SSL_AD_HANDSHAKE_FAILURE;
1616                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1617                                 goto f_err;
1618                                 }
1619                         r[0]=rsa->n;
1620                         r[1]=rsa->e;
1621                         s->s3->tmp.use_rsa_tmp=1;
1622                         }
1623                 else
1624 #endif
1625 #ifndef OPENSSL_NO_DH
1626                         if (type & SSL_kEDH)
1627                         {
1628                         dhp=cert->dh_tmp;
1629                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1630                                 dhp=s->cert->dh_tmp_cb(s,
1631                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1632                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1633                         if (dhp == NULL)
1634                                 {
1635                                 al=SSL_AD_HANDSHAKE_FAILURE;
1636                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1637                                 goto f_err;
1638                                 }
1639
1640                         if (s->s3->tmp.dh != NULL)
1641                                 {
1642                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1643                                 goto err;
1644                                 }
1645
1646                         if ((dh=DHparams_dup(dhp)) == NULL)
1647                                 {
1648                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1649                                 goto err;
1650                                 }
1651
1652                         s->s3->tmp.dh=dh;
1653                         if ((dhp->pub_key == NULL ||
1654                              dhp->priv_key == NULL ||
1655                              (s->options & SSL_OP_SINGLE_DH_USE)))
1656                                 {
1657                                 if(!DH_generate_key(dh))
1658                                     {
1659                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1660                                            ERR_R_DH_LIB);
1661                                     goto err;
1662                                     }
1663                                 }
1664                         else
1665                                 {
1666                                 dh->pub_key=BN_dup(dhp->pub_key);
1667                                 dh->priv_key=BN_dup(dhp->priv_key);
1668                                 if ((dh->pub_key == NULL) ||
1669                                         (dh->priv_key == NULL))
1670                                         {
1671                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1672                                         goto err;
1673                                         }
1674                                 }
1675                         r[0]=dh->p;
1676                         r[1]=dh->g;
1677                         r[2]=dh->pub_key;
1678                         }
1679                 else 
1680 #endif
1681 #ifndef OPENSSL_NO_ECDH
1682                         if (type & SSL_kEECDH)
1683                         {
1684                         const EC_GROUP *group;
1685
1686                         ecdhp=cert->ecdh_tmp;
1687                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1688                                 {
1689                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1690                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1691                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1692                                 }
1693                         if (ecdhp == NULL)
1694                                 {
1695                                 al=SSL_AD_HANDSHAKE_FAILURE;
1696                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1697                                 goto f_err;
1698                                 }
1699
1700                         if (s->s3->tmp.ecdh != NULL)
1701                                 {
1702                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1703                                 goto err;
1704                                 }
1705
1706                         /* Duplicate the ECDH structure. */
1707                         if (ecdhp == NULL)
1708                                 {
1709                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1710                                 goto err;
1711                                 }
1712                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1713                                 {
1714                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1715                                 goto err;
1716                                 }
1717
1718                         s->s3->tmp.ecdh=ecdh;
1719                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1720                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1721                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1722                                 {
1723                                 if(!EC_KEY_generate_key(ecdh))
1724                                     {
1725                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1726                                     goto err;
1727                                     }
1728                                 }
1729
1730                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1731                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1732                             (EC_KEY_get0_private_key(ecdh) == NULL))
1733                                 {
1734                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1735                                 goto err;
1736                                 }
1737
1738                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1739                             (EC_GROUP_get_degree(group) > 163)) 
1740                                 {
1741                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1742                                 goto err;
1743                                 }
1744
1745                         /* XXX: For now, we only support ephemeral ECDH
1746                          * keys over named (not generic) curves. For 
1747                          * supported named curves, curve_id is non-zero.
1748                          */
1749                         if ((curve_id = 
1750                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1751                             == 0)
1752                                 {
1753                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1754                                 goto err;
1755                                 }
1756
1757                         /* Encode the public key.
1758                          * First check the size of encoding and
1759                          * allocate memory accordingly.
1760                          */
1761                         encodedlen = EC_POINT_point2oct(group, 
1762                             EC_KEY_get0_public_key(ecdh),
1763                             POINT_CONVERSION_UNCOMPRESSED, 
1764                             NULL, 0, NULL);
1765
1766                         encodedPoint = (unsigned char *) 
1767                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1768                         bn_ctx = BN_CTX_new();
1769                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1770                                 {
1771                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1772                                 goto err;
1773                                 }
1774
1775
1776                         encodedlen = EC_POINT_point2oct(group, 
1777                             EC_KEY_get0_public_key(ecdh), 
1778                             POINT_CONVERSION_UNCOMPRESSED, 
1779                             encodedPoint, encodedlen, bn_ctx);
1780
1781                         if (encodedlen == 0) 
1782                                 {
1783                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1784                                 goto err;
1785                                 }
1786
1787                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1788
1789                         /* XXX: For now, we only support named (not 
1790                          * generic) curves in ECDH ephemeral key exchanges.
1791                          * In this situation, we need four additional bytes
1792                          * to encode the entire ServerECDHParams
1793                          * structure. 
1794                          */
1795                         n = 4 + encodedlen;
1796
1797                         /* We'll generate the serverKeyExchange message
1798                          * explicitly so we can set these to NULLs
1799                          */
1800                         r[0]=NULL;
1801                         r[1]=NULL;
1802                         r[2]=NULL;
1803                         r[3]=NULL;
1804                         }
1805                 else 
1806 #endif /* !OPENSSL_NO_ECDH */
1807 #ifndef OPENSSL_NO_PSK
1808                         if (type & SSL_kPSK)
1809                                 {
1810                                 /* reserve size for record length and PSK identity hint*/
1811                                 n+=2+strlen(s->ctx->psk_identity_hint);
1812                                 }
1813                         else
1814 #endif /* !OPENSSL_NO_PSK */
1815 #ifndef OPENSSL_NO_SRP
1816                 if (type & SSL_kSRP)
1817                         {
1818                         if ((s->srp_ctx.N == NULL) ||
1819                                 (s->srp_ctx.g == NULL) ||
1820                                 (s->srp_ctx.s == NULL) ||
1821                                 (s->srp_ctx.B == NULL))
1822                                 {
1823                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1824                                 goto err;
1825                                 }
1826                         r[0]=s->srp_ctx.N;
1827                         r[1]=s->srp_ctx.g;
1828                         r[2]=s->srp_ctx.s;
1829                         r[3]=s->srp_ctx.B;
1830                         }
1831                 else 
1832 #endif
1833                         {
1834                         al=SSL_AD_HANDSHAKE_FAILURE;
1835                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1836                         goto f_err;
1837                         }
1838                 for (i=0; r[i] != NULL && i<4; i++)
1839                         {
1840                         nr[i]=BN_num_bytes(r[i]);
1841 #ifndef OPENSSL_NO_SRP
1842                         if ((i == 2) && (type & SSL_kSRP))
1843                                 n+=1+nr[i];
1844                         else
1845 #endif
1846                         n+=2+nr[i];
1847                         }
1848
1849                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1850                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1851                         {
1852                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1853                                 == NULL)
1854                                 {
1855                                 al=SSL_AD_DECODE_ERROR;
1856                                 goto f_err;
1857                                 }
1858                         kn=EVP_PKEY_size(pkey);
1859                         }
1860                 else
1861                         {
1862                         pkey=NULL;
1863                         kn=0;
1864                         }
1865
1866                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1867                         {
1868                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1869                         goto err;
1870                         }
1871                 d=(unsigned char *)s->init_buf->data;
1872                 p= &(d[4]);
1873
1874                 for (i=0; r[i] != NULL && i<4; i++)
1875                         {
1876 #ifndef OPENSSL_NO_SRP
1877                         if ((i == 2) && (type & SSL_kSRP))
1878                                 {
1879                                 *p = nr[i];
1880                                 p++;
1881                                 }
1882                         else
1883 #endif
1884                         s2n(nr[i],p);
1885                         BN_bn2bin(r[i],p);
1886                         p+=nr[i];
1887                         }
1888
1889 #ifndef OPENSSL_NO_ECDH
1890                 if (type & SSL_kEECDH) 
1891                         {
1892                         /* XXX: For now, we only support named (not generic) curves.
1893                          * In this situation, the serverKeyExchange message has:
1894                          * [1 byte CurveType], [2 byte CurveName]
1895                          * [1 byte length of encoded point], followed by
1896                          * the actual encoded point itself
1897                          */
1898                         *p = NAMED_CURVE_TYPE;
1899                         p += 1;
1900                         *p = 0;
1901                         p += 1;
1902                         *p = curve_id;
1903                         p += 1;
1904                         *p = encodedlen;
1905                         p += 1;
1906                         memcpy((unsigned char*)p, 
1907                             (unsigned char *)encodedPoint, 
1908                             encodedlen);
1909                         OPENSSL_free(encodedPoint);
1910                         encodedPoint = NULL;
1911                         p += encodedlen;
1912                         }
1913 #endif
1914
1915 #ifndef OPENSSL_NO_PSK
1916                 if (type & SSL_kPSK)
1917                         {
1918                         /* copy PSK identity hint */
1919                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1920                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1921                         p+=strlen(s->ctx->psk_identity_hint);
1922                         }
1923 #endif
1924
1925                 /* not anonymous */
1926                 if (pkey != NULL)
1927                         {
1928                         /* n is the length of the params, they start at &(d[4])
1929                          * and p points to the space at the end. */
1930 #ifndef OPENSSL_NO_RSA
1931                         if (pkey->type == EVP_PKEY_RSA
1932                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1933                                 {
1934                                 q=md_buf;
1935                                 j=0;
1936                                 for (num=2; num > 0; num--)
1937                                         {
1938                                         EVP_MD_CTX_set_flags(&md_ctx,
1939                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1940                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1941                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1942                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1943                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1944                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1945                                         EVP_DigestFinal_ex(&md_ctx,q,
1946                                                 (unsigned int *)&i);
1947                                         q+=i;
1948                                         j+=i;
1949                                         }
1950                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1951                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1952                                         {
1953                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1954                                         goto err;
1955                                         }
1956                                 s2n(u,p);
1957                                 n+=u+2;
1958                                 }
1959                         else
1960 #endif
1961                         if (md)
1962                                 {
1963                                 /* For TLS1.2 and later send signature
1964                                  * algorithm */
1965                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1966                                         {
1967                                         if (!tls12_get_sigandhash(p, pkey, md))
1968                                                 {
1969                                                 /* Should never happen */
1970                                                 al=SSL_AD_INTERNAL_ERROR;
1971                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1972                                                 goto f_err;
1973                                                 }
1974                                         p+=2;
1975                                         }
1976 #ifdef SSL_DEBUG
1977                                 fprintf(stderr, "Using hash %s\n",
1978                                                         EVP_MD_name(md));
1979 #endif
1980                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1981                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1982                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1983                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1984                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1985                                         (unsigned int *)&i,pkey))
1986                                         {
1987                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1988                                         goto err;
1989                                         }
1990                                 s2n(i,p);
1991                                 n+=i+2;
1992                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1993                                         n+= 2;
1994                                 }
1995                         else
1996                                 {
1997                                 /* Is this error check actually needed? */
1998                                 al=SSL_AD_HANDSHAKE_FAILURE;
1999                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2000                                 goto f_err;
2001                                 }
2002                         }
2003
2004                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2005                 l2n3(n,d);
2006
2007                 /* we should now have things packed up, so lets send
2008                  * it off */
2009                 s->init_num=n+4;
2010                 s->init_off=0;
2011                 }
2012
2013         s->state = SSL3_ST_SW_KEY_EXCH_B;
2014         EVP_MD_CTX_cleanup(&md_ctx);
2015         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2016 f_err:
2017         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2018 err:
2019 #ifndef OPENSSL_NO_ECDH
2020         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2021         BN_CTX_free(bn_ctx);
2022 #endif
2023         EVP_MD_CTX_cleanup(&md_ctx);
2024         return(-1);
2025         }
2026
2027 int ssl3_send_certificate_request(SSL *s)
2028         {
2029         unsigned char *p,*d;
2030         int i,j,nl,off,n;
2031         STACK_OF(X509_NAME) *sk=NULL;
2032         X509_NAME *name;
2033         BUF_MEM *buf;
2034
2035         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2036                 {
2037                 buf=s->init_buf;
2038
2039                 d=p=(unsigned char *)&(buf->data[4]);
2040
2041                 /* get the list of acceptable cert types */
2042                 p++;
2043                 n=ssl3_get_req_cert_type(s,p);
2044                 d[0]=n;
2045                 p+=n;
2046                 n++;
2047
2048                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2049                         {
2050                         nl = tls12_get_req_sig_algs(s, p + 2);
2051                         s2n(nl, p);
2052                         p += nl + 2;
2053                         n += nl + 2;
2054                         }
2055
2056                 off=n;
2057                 p+=2;
2058                 n+=2;
2059
2060                 sk=SSL_get_client_CA_list(s);
2061                 nl=0;
2062                 if (sk != NULL)
2063                         {
2064                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2065                                 {
2066                                 name=sk_X509_NAME_value(sk,i);
2067                                 j=i2d_X509_NAME(name,NULL);
2068                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2069                                         {
2070                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2071                                         goto err;
2072                                         }
2073                                 p=(unsigned char *)&(buf->data[4+n]);
2074                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2075                                         {
2076                                         s2n(j,p);
2077                                         i2d_X509_NAME(name,&p);
2078                                         n+=2+j;
2079                                         nl+=2+j;
2080                                         }
2081                                 else
2082                                         {
2083                                         d=p;
2084                                         i2d_X509_NAME(name,&p);
2085                                         j-=2; s2n(j,d); j+=2;
2086                                         n+=j;
2087                                         nl+=j;
2088                                         }
2089                                 }
2090                         }
2091                 /* else no CA names */
2092                 p=(unsigned char *)&(buf->data[4+off]);
2093                 s2n(nl,p);
2094
2095                 d=(unsigned char *)buf->data;
2096                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2097                 l2n3(n,d);
2098
2099                 /* we should now have things packed up, so lets send
2100                  * it off */
2101
2102                 s->init_num=n+4;
2103                 s->init_off=0;
2104 #ifdef NETSCAPE_HANG_BUG
2105                 p=(unsigned char *)s->init_buf->data + s->init_num;
2106
2107                 /* do the header */
2108                 *(p++)=SSL3_MT_SERVER_DONE;
2109                 *(p++)=0;
2110                 *(p++)=0;
2111                 *(p++)=0;
2112                 s->init_num += 4;
2113 #endif
2114
2115                 s->state = SSL3_ST_SW_CERT_REQ_B;
2116                 }
2117
2118         /* SSL3_ST_SW_CERT_REQ_B */
2119         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2120 err:
2121         return(-1);
2122         }
2123
2124 int ssl3_get_client_key_exchange(SSL *s)
2125         {
2126         int i,al,ok;
2127         long n;
2128         unsigned long alg_k;
2129         unsigned char *p;
2130 #ifndef OPENSSL_NO_RSA
2131         RSA *rsa=NULL;
2132         EVP_PKEY *pkey=NULL;
2133 #endif
2134 #ifndef OPENSSL_NO_DH
2135         BIGNUM *pub=NULL;
2136         DH *dh_srvr, *dh_clnt = NULL;
2137 #endif
2138 #ifndef OPENSSL_NO_KRB5
2139         KSSL_ERR kssl_err;
2140 #endif /* OPENSSL_NO_KRB5 */
2141
2142 #ifndef OPENSSL_NO_ECDH
2143         EC_KEY *srvr_ecdh = NULL;
2144         EVP_PKEY *clnt_pub_pkey = NULL;
2145         EC_POINT *clnt_ecpoint = NULL;
2146         BN_CTX *bn_ctx = NULL; 
2147 #endif
2148
2149         n=s->method->ssl_get_message(s,
2150                 SSL3_ST_SR_KEY_EXCH_A,
2151                 SSL3_ST_SR_KEY_EXCH_B,
2152                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2153                 2048, /* ??? */
2154                 &ok);
2155
2156         if (!ok) return((int)n);
2157         p=(unsigned char *)s->init_msg;
2158
2159         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2160
2161 #ifndef OPENSSL_NO_RSA
2162         if (alg_k & SSL_kRSA)
2163                 {
2164                 /* FIX THIS UP EAY EAY EAY EAY */
2165                 if (s->s3->tmp.use_rsa_tmp)
2166                         {
2167                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2168                                 rsa=s->cert->rsa_tmp;
2169                         /* Don't do a callback because rsa_tmp should
2170                          * be sent already */
2171                         if (rsa == NULL)
2172                                 {
2173                                 al=SSL_AD_HANDSHAKE_FAILURE;
2174                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2175                                 goto f_err;
2176
2177                                 }
2178                         }
2179                 else
2180                         {
2181                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2182                         if (    (pkey == NULL) ||
2183                                 (pkey->type != EVP_PKEY_RSA) ||
2184                                 (pkey->pkey.rsa == NULL))
2185                                 {
2186                                 al=SSL_AD_HANDSHAKE_FAILURE;
2187                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2188                                 goto f_err;
2189                                 }
2190                         rsa=pkey->pkey.rsa;
2191                         }
2192
2193                 /* TLS and [incidentally] DTLS{0xFEFF} */
2194                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2195                         {
2196                         n2s(p,i);
2197                         if (n != i+2)
2198                                 {
2199                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2200                                         {
2201                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2202                                         goto err;
2203                                         }
2204                                 else
2205                                         p-=2;
2206                                 }
2207                         else
2208                                 n=i;
2209                         }
2210
2211                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2212
2213                 al = -1;
2214                 
2215                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2216                         {
2217                         al=SSL_AD_DECODE_ERROR;
2218                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2219                         }
2220
2221                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2222                         {
2223                         /* The premaster secret must contain the same version number as the
2224                          * ClientHello to detect version rollback attacks (strangely, the
2225                          * protocol does not offer such protection for DH ciphersuites).
2226                          * However, buggy clients exist that send the negotiated protocol
2227                          * version instead if the server does not support the requested
2228                          * protocol version.
2229                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2230                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2231                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2232                                 {
2233                                 al=SSL_AD_DECODE_ERROR;
2234                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2235
2236                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2237                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2238                                  * number check as a "bad version oracle" -- an alert would
2239                                  * reveal that the plaintext corresponding to some ciphertext
2240                                  * made up by the adversary is properly formatted except
2241                                  * that the version number is wrong.  To avoid such attacks,
2242                                  * we should treat this just like any other decryption error. */
2243                                 }
2244                         }
2245
2246                 if (al != -1)
2247                         {
2248                         /* Some decryption failure -- use random value instead as countermeasure
2249                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2250                          * (see RFC 2246, section 7.4.7.1). */
2251                         ERR_clear_error();
2252                         i = SSL_MAX_MASTER_KEY_LENGTH;
2253                         p[0] = s->client_version >> 8;
2254                         p[1] = s->client_version & 0xff;
2255                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2256                                 goto err;
2257                         }
2258         
2259                 s->session->master_key_length=
2260                         s->method->ssl3_enc->generate_master_secret(s,
2261                                 s->session->master_key,
2262                                 p,i);
2263                 OPENSSL_cleanse(p,i);
2264                 }
2265         else
2266 #endif
2267 #ifndef OPENSSL_NO_DH
2268                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2269                 {
2270                 int idx = -1;
2271                 EVP_PKEY *skey = NULL;
2272                 if (n)
2273                         n2s(p,i);
2274                 if (n && n != i+2)
2275                         {
2276                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2277                                 {
2278                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2279                                 goto err;
2280                                 }
2281                         else
2282                                 {
2283                                 p-=2;
2284                                 i=(int)n;
2285                                 }
2286                         }
2287                 if (alg_k & SSL_kDHr)
2288                         idx = SSL_PKEY_DH_RSA;
2289                 else if (alg_k & SSL_kDHd)
2290                         idx = SSL_PKEY_DH_DSA;
2291                 if (idx >= 0)
2292                         {
2293                         skey = s->cert->pkeys[idx].privatekey;
2294                         if ((skey == NULL) ||
2295                                 (skey->type != EVP_PKEY_DH) ||
2296                                 (skey->pkey.dh == NULL))
2297                                 {
2298                                 al=SSL_AD_HANDSHAKE_FAILURE;
2299                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2300                                 goto f_err;
2301                                 }
2302                         dh_srvr = skey->pkey.dh;
2303                         }
2304                 else if (s->s3->tmp.dh == NULL)
2305                         {
2306                         al=SSL_AD_HANDSHAKE_FAILURE;
2307                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2308                         goto f_err;
2309                         }
2310                 else
2311                         dh_srvr=s->s3->tmp.dh;
2312
2313                 if (n == 0L)
2314                         {
2315                         /* Get pubkey from cert */
2316                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2317                         if (clkey)
2318                                 {
2319                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2320                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2321                                 }
2322                         if (dh_clnt == NULL)
2323                                 {
2324                                 al=SSL_AD_HANDSHAKE_FAILURE;
2325                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2326                                 goto f_err;
2327                                 }
2328                         EVP_PKEY_free(clkey);
2329                         pub = dh_clnt->pub_key;
2330                         }
2331                 else
2332                         pub=BN_bin2bn(p,i,NULL);
2333                 if (pub == NULL)
2334                         {
2335                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2336                         goto err;
2337                         }
2338
2339                 i=DH_compute_key(p,pub,dh_srvr);
2340
2341                 if (i <= 0)
2342                         {
2343                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2344                         BN_clear_free(pub);
2345                         goto err;
2346                         }
2347
2348                 DH_free(s->s3->tmp.dh);
2349                 s->s3->tmp.dh=NULL;
2350                 if (dh_clnt)
2351                         DH_free(dh_clnt);
2352                 else
2353                         BN_clear_free(pub);
2354                 pub=NULL;
2355                 s->session->master_key_length=
2356                         s->method->ssl3_enc->generate_master_secret(s,
2357                                 s->session->master_key,p,i);
2358                 OPENSSL_cleanse(p,i);
2359                 if (dh_clnt)
2360                         return 2;
2361                 }
2362         else
2363 #endif
2364 #ifndef OPENSSL_NO_KRB5
2365         if (alg_k & SSL_kKRB5)
2366                 {
2367                 krb5_error_code         krb5rc;
2368                 krb5_data               enc_ticket;
2369                 krb5_data               authenticator;
2370                 krb5_data               enc_pms;
2371                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2372                 EVP_CIPHER_CTX          ciph_ctx;
2373                 const EVP_CIPHER        *enc = NULL;
2374                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2375                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2376                                                + EVP_MAX_BLOCK_LENGTH];
2377                 int                  padl, outl;
2378                 krb5_timestamp          authtime = 0;
2379                 krb5_ticket_times       ttimes;
2380
2381                 EVP_CIPHER_CTX_init(&ciph_ctx);
2382
2383                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2384
2385                 n2s(p,i);
2386                 enc_ticket.length = i;
2387
2388                 if (n < (long)(enc_ticket.length + 6))
2389                         {
2390                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2391                                 SSL_R_DATA_LENGTH_TOO_LONG);
2392                         goto err;
2393                         }
2394
2395                 enc_ticket.data = (char *)p;
2396                 p+=enc_ticket.length;
2397
2398                 n2s(p,i);
2399                 authenticator.length = i;
2400
2401                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2402                         {
2403                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2404                                 SSL_R_DATA_LENGTH_TOO_LONG);
2405                         goto err;
2406                         }
2407
2408                 authenticator.data = (char *)p;
2409                 p+=authenticator.length;
2410
2411                 n2s(p,i);
2412                 enc_pms.length = i;
2413                 enc_pms.data = (char *)p;
2414                 p+=enc_pms.length;
2415
2416                 /* Note that the length is checked again below,
2417                 ** after decryption
2418                 */
2419                 if(enc_pms.length > sizeof pms)
2420                         {
2421                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2422                                SSL_R_DATA_LENGTH_TOO_LONG);
2423                         goto err;
2424                         }
2425
2426                 if (n != (long)(enc_ticket.length + authenticator.length +
2427                                                 enc_pms.length + 6))
2428                         {
2429                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2430                                 SSL_R_DATA_LENGTH_TOO_LONG);
2431                         goto err;
2432                         }
2433
2434                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2435                                         &kssl_err)) != 0)
2436                         {
2437 #ifdef KSSL_DEBUG
2438                         printf("kssl_sget_tkt rtn %d [%d]\n",
2439                                 krb5rc, kssl_err.reason);
2440                         if (kssl_err.text)
2441                                 printf("kssl_err text= %s\n", kssl_err.text);
2442 #endif  /* KSSL_DEBUG */
2443                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2444                                 kssl_err.reason);
2445                         goto err;
2446                         }
2447
2448                 /*  Note: no authenticator is not considered an error,
2449                 **  but will return authtime == 0.
2450                 */
2451                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2452                                         &authtime, &kssl_err)) != 0)
2453                         {
2454 #ifdef KSSL_DEBUG
2455                         printf("kssl_check_authent rtn %d [%d]\n",
2456                                 krb5rc, kssl_err.reason);
2457                         if (kssl_err.text)
2458                                 printf("kssl_err text= %s\n", kssl_err.text);
2459 #endif  /* KSSL_DEBUG */
2460                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2461                                 kssl_err.reason);
2462                         goto err;
2463                         }
2464
2465                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2466                         {
2467                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2468                         goto err;
2469                         }
2470
2471 #ifdef KSSL_DEBUG
2472                 kssl_ctx_show(kssl_ctx);
2473 #endif  /* KSSL_DEBUG */
2474
2475                 enc = kssl_map_enc(kssl_ctx->enctype);
2476                 if (enc == NULL)
2477                     goto err;
2478
2479                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2480
2481                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2482                         {
2483                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2484                                 SSL_R_DECRYPTION_FAILED);
2485                         goto err;
2486                         }
2487                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2488                                         (unsigned char *)enc_pms.data, enc_pms.length))
2489                         {
2490                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2491                                 SSL_R_DECRYPTION_FAILED);
2492                         goto err;
2493                         }
2494                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2495                         {
2496                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2497                                 SSL_R_DATA_LENGTH_TOO_LONG);
2498                         goto err;
2499                         }
2500                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2501                         {
2502                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2503                                 SSL_R_DECRYPTION_FAILED);
2504                         goto err;
2505                         }
2506                 outl += padl;
2507                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2508                         {
2509                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2510                                 SSL_R_DATA_LENGTH_TOO_LONG);
2511                         goto err;
2512                         }
2513                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2514                     {
2515                     /* The premaster secret must contain the same version number as the
2516                      * ClientHello to detect version rollback attacks (strangely, the
2517                      * protocol does not offer such protection for DH ciphersuites).
2518                      * However, buggy clients exist that send random bytes instead of
2519                      * the protocol version.
2520                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2521                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2522                      */
2523                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2524                         {
2525                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2526                                SSL_AD_DECODE_ERROR);
2527                         goto err;
2528                         }
2529                     }
2530
2531                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2532
2533                 s->session->master_key_length=
2534                         s->method->ssl3_enc->generate_master_secret(s,
2535                                 s->session->master_key, pms, outl);
2536
2537                 if (kssl_ctx->client_princ)
2538                         {
2539                         size_t len = strlen(kssl_ctx->client_princ);
2540                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2541                                 {
2542                                 s->session->krb5_client_princ_len = len;
2543                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2544                                 }
2545                         }
2546
2547
2548                 /*  Was doing kssl_ctx_free() here,
2549                 **  but it caused problems for apache.
2550                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2551                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2552                 */
2553                 }
2554         else
2555 #endif  /* OPENSSL_NO_KRB5 */
2556
2557 #ifndef OPENSSL_NO_ECDH
2558                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2559                 {
2560                 int ret = 1;
2561                 int field_size = 0;
2562                 const EC_KEY   *tkey;
2563                 const EC_GROUP *group;
2564                 const BIGNUM *priv_key;
2565
2566                 /* initialize structures for server's ECDH key pair */
2567                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2568                         {
2569                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2570                             ERR_R_MALLOC_FAILURE);
2571                         goto err;
2572                         }
2573
2574                 /* Let's get server private key and group information */
2575                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2576                         { 
2577                         /* use the certificate */
2578                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2579                         }
2580                 else
2581                         {
2582                         /* use the ephermeral values we saved when
2583                          * generating the ServerKeyExchange msg.
2584                          */
2585                         tkey = s->s3->tmp.ecdh;
2586                         }
2587
2588                 group    = EC_KEY_get0_group(tkey);
2589                 priv_key = EC_KEY_get0_private_key(tkey);
2590
2591                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2592                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2593                         {
2594                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2595                                ERR_R_EC_LIB);
2596                         goto err;
2597                         }
2598
2599                 /* Let's get client's public key */
2600                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2601                         {
2602                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2603                             ERR_R_MALLOC_FAILURE);
2604                         goto err;
2605                         }
2606
2607                 if (n == 0L) 
2608                         {
2609                         /* Client Publickey was in Client Certificate */
2610
2611                          if (alg_k & SSL_kEECDH)
2612                                  {
2613                                  al=SSL_AD_HANDSHAKE_FAILURE;
2614                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2615                                  goto f_err;
2616                                  }
2617                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2618                             == NULL) || 
2619                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2620                                 {
2621                                 /* XXX: For now, we do not support client
2622                                  * authentication using ECDH certificates
2623                                  * so this branch (n == 0L) of the code is
2624                                  * never executed. When that support is
2625                                  * added, we ought to ensure the key 
2626                                  * received in the certificate is 
2627                                  * authorized for key agreement.
2628                                  * ECDH_compute_key implicitly checks that
2629                                  * the two ECDH shares are for the same
2630                                  * group.
2631                                  */
2632                                 al=SSL_AD_HANDSHAKE_FAILURE;
2633                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2634                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2635                                 goto f_err;
2636                                 }
2637
2638                         if (EC_POINT_copy(clnt_ecpoint,
2639                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2640                                 {
2641                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2642                                         ERR_R_EC_LIB);
2643                                 goto err;
2644                                 }
2645                         ret = 2; /* Skip certificate verify processing */
2646                         }
2647                 else
2648                         {
2649                         /* Get client's public key from encoded point
2650                          * in the ClientKeyExchange message.
2651                          */
2652                         if ((bn_ctx = BN_CTX_new()) == NULL)
2653                                 {
2654                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2655                                     ERR_R_MALLOC_FAILURE);
2656                                 goto err;
2657                                 }
2658
2659                         /* Get encoded point length */
2660                         i = *p; 
2661                         p += 1;
2662                         if (n != 1 + i)
2663                                 {
2664                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2665                                     ERR_R_EC_LIB);
2666                                 goto err;
2667                                 }
2668                         if (EC_POINT_oct2point(group, 
2669                             clnt_ecpoint, p, i, bn_ctx) == 0)
2670                                 {
2671                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2672                                     ERR_R_EC_LIB);
2673                                 goto err;
2674                                 }
2675                         /* p is pointing to somewhere in the buffer
2676                          * currently, so set it to the start 
2677                          */ 
2678                         p=(unsigned char *)s->init_buf->data;
2679                         }
2680
2681                 /* Compute the shared pre-master secret */
2682                 field_size = EC_GROUP_get_degree(group);
2683                 if (field_size <= 0)
2684                         {
2685                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2686                                ERR_R_ECDH_LIB);
2687                         goto err;
2688                         }
2689                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2690                 if (i <= 0)
2691                         {
2692                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2693                             ERR_R_ECDH_LIB);
2694                         goto err;
2695                         }
2696
2697                 EVP_PKEY_free(clnt_pub_pkey);
2698                 EC_POINT_free(clnt_ecpoint);
2699                 EC_KEY_free(srvr_ecdh);
2700                 BN_CTX_free(bn_ctx);
2701                 EC_KEY_free(s->s3->tmp.ecdh);
2702                 s->s3->tmp.ecdh = NULL; 
2703
2704                 /* Compute the master secret */
2705                 s->session->master_key_length = s->method->ssl3_enc-> \
2706                     generate_master_secret(s, s->session->master_key, p, i);
2707                 
2708                 OPENSSL_cleanse(p, i);
2709                 return (ret);
2710                 }
2711         else
2712 #endif
2713 #ifndef OPENSSL_NO_PSK
2714                 if (alg_k & SSL_kPSK)
2715                         {
2716                         unsigned char *t = NULL;
2717                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2718                         unsigned int pre_ms_len = 0, psk_len = 0;
2719                         int psk_err = 1;
2720                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2721
2722                         al=SSL_AD_HANDSHAKE_FAILURE;
2723
2724                         n2s(p,i);
2725                         if (n != i+2)
2726                                 {
2727                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2728                                         SSL_R_LENGTH_MISMATCH);
2729                                 goto psk_err;
2730                                 }
2731                         if (i > PSK_MAX_IDENTITY_LEN)
2732                                 {
2733                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2734                                         SSL_R_DATA_LENGTH_TOO_LONG);
2735                                 goto psk_err;
2736                                 }
2737                         if (s->psk_server_callback == NULL)
2738                                 {
2739                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2740                                        SSL_R_PSK_NO_SERVER_CB);
2741                                 goto psk_err;
2742                                 }
2743
2744                         /* Create guaranteed NULL-terminated identity
2745                          * string for the callback */
2746                         memcpy(tmp_id, p, i);
2747                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2748                         psk_len = s->psk_server_callback(s, tmp_id,
2749                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2750                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2751
2752                         if (psk_len > PSK_MAX_PSK_LEN)
2753                                 {
2754                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2755                                         ERR_R_INTERNAL_ERROR);
2756                                 goto psk_err;
2757                                 }
2758                         else if (psk_len == 0)
2759                                 {
2760                                 /* PSK related to the given identity not found */
2761                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2762                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2763                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2764                                 goto psk_err;
2765                                 }
2766
2767                         /* create PSK pre_master_secret */
2768                         pre_ms_len=2+psk_len+2+psk_len;
2769                         t = psk_or_pre_ms;
2770                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2771                         s2n(psk_len, t);
2772                         memset(t, 0, psk_len);
2773                         t+=psk_len;
2774                         s2n(psk_len, t);
2775
2776                         if (s->session->psk_identity != NULL)
2777                                 OPENSSL_free(s->session->psk_identity);
2778                         s->session->psk_identity = BUF_strdup((char *)p);
2779                         if (s->session->psk_identity == NULL)
2780                                 {
2781                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2782                                         ERR_R_MALLOC_FAILURE);
2783                                 goto psk_err;
2784                                 }
2785
2786                         if (s->session->psk_identity_hint != NULL)
2787                                 OPENSSL_free(s->session->psk_identity_hint);
2788                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2789                         if (s->ctx->psk_identity_hint != NULL &&
2790                                 s->session->psk_identity_hint == NULL)
2791                                 {
2792                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2793                                         ERR_R_MALLOC_FAILURE);
2794                                 goto psk_err;
2795                                 }
2796
2797                         s->session->master_key_length=
2798                                 s->method->ssl3_enc->generate_master_secret(s,
2799                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2800                         psk_err = 0;
2801                 psk_err:
2802                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2803                         if (psk_err != 0)
2804                                 goto f_err;
2805                         }
2806                 else
2807 #endif
2808 #ifndef OPENSSL_NO_SRP
2809                 if (alg_k & SSL_kSRP)
2810                         {
2811                         int param_len;
2812
2813                         n2s(p,i);
2814                         param_len=i+2;
2815                         if (param_len > n)
2816                                 {
2817                                 al=SSL_AD_DECODE_ERROR;
2818                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2819                                 goto f_err;
2820                                 }
2821                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2822                                 {
2823                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2824                                 goto err;
2825                                 }
2826                         if (s->session->srp_username != NULL)
2827                                 OPENSSL_free(s->session->srp_username);
2828                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2829                         if (s->session->srp_username == NULL)
2830                                 {
2831                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2832                                         ERR_R_MALLOC_FAILURE);
2833                                 goto err;
2834                                 }
2835
2836                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2837                                 {
2838                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2839                                 goto err;
2840                                 }
2841
2842                         p+=i;
2843                         }
2844                 else
2845 #endif  /* OPENSSL_NO_SRP */
2846                 if (alg_k & SSL_kGOST) 
2847                         {
2848                         int ret = 0;
2849                         EVP_PKEY_CTX *pkey_ctx;
2850                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2851                         unsigned char premaster_secret[32], *start;
2852                         size_t outlen=32, inlen;
2853                         unsigned long alg_a;
2854
2855                         /* Get our certificate private key*/
2856                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2857                         if (alg_a & SSL_aGOST94)
2858                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2859                         else if (alg_a & SSL_aGOST01)
2860                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2861
2862                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2863                         EVP_PKEY_decrypt_init(pkey_ctx);
2864                         /* If client certificate is present and is of the same type, maybe
2865                          * use it for key exchange.  Don't mind errors from
2866                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2867                          * a client certificate for authorization only. */
2868                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2869                         if (client_pub_pkey)
2870                                 {
2871                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2872                                         ERR_clear_error();
2873                                 }
2874                         /* Decrypt session key */
2875                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2876                                 {
2877                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2878                                 goto gerr;
2879                                 }
2880                         if (p[1] == 0x81)
2881                                 {
2882                                 start = p+3;
2883                                 inlen = p[2];
2884                                 }
2885                         else if (p[1] < 0x80)
2886                                 {
2887                                 start = p+2;
2888                                 inlen = p[1];
2889                                 }
2890                         else
2891                                 {
2892                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2893                                 goto gerr;
2894                                 }
2895                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2896
2897                                 {
2898                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2899                                 goto gerr;
2900                                 }
2901                         /* Generate master secret */
2902                         s->session->master_key_length=
2903                                 s->method->ssl3_enc->generate_master_secret(s,
2904                                         s->session->master_key,premaster_secret,32);
2905                         /* Check if pubkey from client certificate was used */
2906                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2907                                 ret = 2;
2908                         else
2909                                 ret = 1;
2910                 gerr:
2911                         EVP_PKEY_free(client_pub_pkey);
2912                         EVP_PKEY_CTX_free(pkey_ctx);
2913                         if (ret)
2914                                 return ret;
2915                         else
2916                                 goto err;
2917                         }
2918                 else
2919                 {
2920                 al=SSL_AD_HANDSHAKE_FAILURE;
2921                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2922                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2923                 goto f_err;
2924                 }
2925
2926         return(1);
2927 f_err:
2928         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2929 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2930 err:
2931 #endif