Prepare for 1.0.1j release
[openssl.git] / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include "ssl_locl.h"
156 #include "kssl_lcl.h"
157 #include "../crypto/constant_time_locl.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
302                         if (s->state != SSL_ST_RENEGOTIATE)
303                                 {
304                                 /* Ok, we now need to push on a buffering BIO so that
305                                  * the output is sent in a way that TCP likes :-)
306                                  */
307                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
308                                 
309                                 ssl3_init_finished_mac(s);
310                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
311                                 s->ctx->stats.sess_accept++;
312                                 }
313                         else if (!s->s3->send_connection_binding &&
314                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
315                                 {
316                                 /* Server attempting to renegotiate with
317                                  * client that doesn't support secure
318                                  * renegotiation.
319                                  */
320                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
321                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
322                                 ret = -1;
323                                 goto end;
324                                 }
325                         else
326                                 {
327                                 /* s->state == SSL_ST_RENEGOTIATE,
328                                  * we will just send a HelloRequest */
329                                 s->ctx->stats.sess_accept_renegotiate++;
330                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
331                                 }
332                         break;
333
334                 case SSL3_ST_SW_HELLO_REQ_A:
335                 case SSL3_ST_SW_HELLO_REQ_B:
336
337                         s->shutdown=0;
338                         ret=ssl3_send_hello_request(s);
339                         if (ret <= 0) goto end;
340                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
341                         s->state=SSL3_ST_SW_FLUSH;
342                         s->init_num=0;
343
344                         ssl3_init_finished_mac(s);
345                         break;
346
347                 case SSL3_ST_SW_HELLO_REQ_C:
348                         s->state=SSL_ST_OK;
349                         break;
350
351                 case SSL3_ST_SR_CLNT_HELLO_A:
352                 case SSL3_ST_SR_CLNT_HELLO_B:
353                 case SSL3_ST_SR_CLNT_HELLO_C:
354
355                         s->shutdown=0;
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|SSL_aKRB5|SSL_aSRP))
415                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
416                                 {
417                                 ret=ssl3_send_server_certificate(s);
418                                 if (ret <= 0) goto end;
419 #ifndef OPENSSL_NO_TLSEXT
420                                 if (s->tlsext_status_expected)
421                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
422                                 else
423                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
424                                 }
425                         else
426                                 {
427                                 skip = 1;
428                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
429                                 }
430 #else
431                                 }
432                         else
433                                 skip=1;
434
435                         s->state=SSL3_ST_SW_KEY_EXCH_A;
436 #endif
437                         s->init_num=0;
438                         break;
439
440                 case SSL3_ST_SW_KEY_EXCH_A:
441                 case SSL3_ST_SW_KEY_EXCH_B:
442                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
443
444                         /* clear this, it may get reset by
445                          * send_server_key_exchange */
446                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
447 #ifndef OPENSSL_NO_KRB5
448                                 && !(alg_k & SSL_kKRB5)
449 #endif /* OPENSSL_NO_KRB5 */
450                                 )
451                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
452                                  * even when forbidden by protocol specs
453                                  * (handshake may fail as clients are not required to
454                                  * be able to handle this) */
455                                 s->s3->tmp.use_rsa_tmp=1;
456                         else
457                                 s->s3->tmp.use_rsa_tmp=0;
458
459
460                         /* only send if a DH key exchange, fortezza or
461                          * RSA but we have a sign only certificate
462                          *
463                          * PSK: may send PSK identity hints
464                          *
465                          * For ECC ciphersuites, we send a serverKeyExchange
466                          * message only if the cipher suite is either
467                          * ECDH-anon or ECDHE. In other cases, the
468                          * server certificate contains the server's
469                          * public key for key exchange.
470                          */
471                         if (s->s3->tmp.use_rsa_tmp
472                         /* PSK: send ServerKeyExchange if PSK identity
473                          * hint if provided */
474 #ifndef OPENSSL_NO_PSK
475                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
476 #endif
477 #ifndef OPENSSL_NO_SRP
478                             /* SRP: send ServerKeyExchange */
479                             || (alg_k & SSL_kSRP)
480 #endif
481                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
482                             || (alg_k & SSL_kEECDH)
483                             || ((alg_k & SSL_kRSA)
484                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
485                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
486                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
487                                         )
488                                     )
489                                 )
490                             )
491                                 {
492                                 ret=ssl3_send_server_key_exchange(s);
493                                 if (ret <= 0) goto end;
494                                 }
495                         else
496                                 skip=1;
497
498                         s->state=SSL3_ST_SW_CERT_REQ_A;
499                         s->init_num=0;
500                         break;
501
502                 case SSL3_ST_SW_CERT_REQ_A:
503                 case SSL3_ST_SW_CERT_REQ_B:
504                         if (/* don't request cert unless asked for it: */
505                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
506                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
507                                  * don't request cert during re-negotiation: */
508                                 ((s->session->peer != NULL) &&
509                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
510                                 /* never request cert in anonymous ciphersuites
511                                  * (see section "Certificate request" in SSL 3 drafts
512                                  * and in RFC 2246): */
513                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
514                                  /* ... except when the application insists on verification
515                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
516                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
517                                  /* never request cert in Kerberos ciphersuites */
518                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) ||
519                                 /* don't request certificate for SRP auth */
520                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
521                                 /* With normal PSK Certificates and
522                                  * Certificate Requests are omitted */
523                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
524                                 {
525                                 /* no cert request */
526                                 skip=1;
527                                 s->s3->tmp.cert_request=0;
528                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
529                                 if (s->s3->handshake_buffer)
530                                         if (!ssl3_digest_cached_records(s))
531                                                 return -1;
532                                 }
533                         else
534                                 {
535                                 s->s3->tmp.cert_request=1;
536                                 ret=ssl3_send_certificate_request(s);
537                                 if (ret <= 0) goto end;
538 #ifndef NETSCAPE_HANG_BUG
539                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
540 #else
541                                 s->state=SSL3_ST_SW_FLUSH;
542                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
543 #endif
544                                 s->init_num=0;
545                                 }
546                         break;
547
548                 case SSL3_ST_SW_SRVR_DONE_A:
549                 case SSL3_ST_SW_SRVR_DONE_B:
550                         ret=ssl3_send_server_done(s);
551                         if (ret <= 0) goto end;
552                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
553                         s->state=SSL3_ST_SW_FLUSH;
554                         s->init_num=0;
555                         break;
556                 
557                 case SSL3_ST_SW_FLUSH:
558
559                         /* This code originally checked to see if
560                          * any data was pending using BIO_CTRL_INFO
561                          * and then flushed. This caused problems
562                          * as documented in PR#1939. The proposed
563                          * fix doesn't completely resolve this issue
564                          * as buggy implementations of BIO_CTRL_PENDING
565                          * still exist. So instead we just flush
566                          * unconditionally.
567                          */
568
569                         s->rwstate=SSL_WRITING;
570                         if (BIO_flush(s->wbio) <= 0)
571                                 {
572                                 ret= -1;
573                                 goto end;
574                                 }
575                         s->rwstate=SSL_NOTHING;
576
577                         s->state=s->s3->tmp.next_state;
578                         break;
579
580                 case SSL3_ST_SR_CERT_A:
581                 case SSL3_ST_SR_CERT_B:
582                         /* Check for second client hello (MS SGC) */
583                         ret = ssl3_check_client_hello(s);
584                         if (ret <= 0)
585                                 goto end;
586                         if (ret == 2)
587                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
588                         else {
589                                 if (s->s3->tmp.cert_request)
590                                         {
591                                         ret=ssl3_get_client_certificate(s);
592                                         if (ret <= 0) goto end;
593                                         }
594                                 s->init_num=0;
595                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
596                         }
597                         break;
598
599                 case SSL3_ST_SR_KEY_EXCH_A:
600                 case SSL3_ST_SR_KEY_EXCH_B:
601                         ret=ssl3_get_client_key_exchange(s);
602                         if (ret <= 0)
603                                 goto end;
604                         if (ret == 2)
605                                 {
606                                 /* For the ECDH ciphersuites when
607                                  * the client sends its ECDH pub key in
608                                  * a certificate, the CertificateVerify
609                                  * message is not sent.
610                                  * Also for GOST ciphersuites when
611                                  * the client uses its key from the certificate
612                                  * for key exchange.
613                                  */
614 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
615                                 s->state=SSL3_ST_SR_FINISHED_A;
616 #else
617                                 if (s->s3->next_proto_neg_seen)
618                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
619                                 else
620                                         s->state=SSL3_ST_SR_FINISHED_A;
621 #endif
622                                 s->init_num = 0;
623                                 }
624                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
625                                 {
626                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
627                                 s->init_num=0;
628                                 if (!s->session->peer)
629                                         break;
630                                 /* For TLS v1.2 freeze the handshake buffer
631                                  * at this point and digest cached records.
632                                  */
633                                 if (!s->s3->handshake_buffer)
634                                         {
635                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
636                                         return -1;
637                                         }
638                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
639                                 if (!ssl3_digest_cached_records(s))
640                                         return -1;
641                                 }
642                         else
643                                 {
644                                 int offset=0;
645                                 int dgst_num;
646
647                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
648                                 s->init_num=0;
649
650                                 /* We need to get hashes here so if there is
651                                  * a client cert, it can be verified
652                                  * FIXME - digest processing for CertificateVerify
653                                  * should be generalized. But it is next step
654                                  */
655                                 if (s->s3->handshake_buffer)
656                                         if (!ssl3_digest_cached_records(s))
657                                                 return -1;
658                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
659                                         if (s->s3->handshake_dgst[dgst_num]) 
660                                                 {
661                                                 int dgst_size;
662
663                                                 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]));
664                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
665                                                 if (dgst_size < 0)
666                                                         {
667                                                         ret = -1;
668                                                         goto end;
669                                                         }
670                                                 offset+=dgst_size;
671                                                 }               
672                                 }
673                         break;
674
675                 case SSL3_ST_SR_CERT_VRFY_A:
676                 case SSL3_ST_SR_CERT_VRFY_B:
677
678                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
679                         /* we should decide if we expected this one */
680                         ret=ssl3_get_cert_verify(s);
681                         if (ret <= 0) goto end;
682
683 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
684                         s->state=SSL3_ST_SR_FINISHED_A;
685 #else
686                         if (s->s3->next_proto_neg_seen)
687                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
688                         else
689                                 s->state=SSL3_ST_SR_FINISHED_A;
690 #endif
691                         s->init_num=0;
692                         break;
693
694 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
695                 case SSL3_ST_SR_NEXT_PROTO_A:
696                 case SSL3_ST_SR_NEXT_PROTO_B:
697                         ret=ssl3_get_next_proto(s);
698                         if (ret <= 0) goto end;
699                         s->init_num = 0;
700                         s->state=SSL3_ST_SR_FINISHED_A;
701                         break;
702 #endif
703
704                 case SSL3_ST_SR_FINISHED_A:
705                 case SSL3_ST_SR_FINISHED_B:
706                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
707                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
708                                 SSL3_ST_SR_FINISHED_B);
709                         if (ret <= 0) goto end;
710                         if (s->hit)
711                                 s->state=SSL_ST_OK;
712 #ifndef OPENSSL_NO_TLSEXT
713                         else if (s->tlsext_ticket_expected)
714                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
715 #endif
716                         else
717                                 s->state=SSL3_ST_SW_CHANGE_A;
718                         s->init_num=0;
719                         break;
720
721 #ifndef OPENSSL_NO_TLSEXT
722                 case SSL3_ST_SW_SESSION_TICKET_A:
723                 case SSL3_ST_SW_SESSION_TICKET_B:
724                         ret=ssl3_send_newsession_ticket(s);
725                         if (ret <= 0) goto end;
726                         s->state=SSL3_ST_SW_CHANGE_A;
727                         s->init_num=0;
728                         break;
729
730                 case SSL3_ST_SW_CERT_STATUS_A:
731                 case SSL3_ST_SW_CERT_STATUS_B:
732                         ret=ssl3_send_cert_status(s);
733                         if (ret <= 0) goto end;
734                         s->state=SSL3_ST_SW_KEY_EXCH_A;
735                         s->init_num=0;
736                         break;
737
738 #endif
739
740                 case SSL3_ST_SW_CHANGE_A:
741                 case SSL3_ST_SW_CHANGE_B:
742
743                         s->session->cipher=s->s3->tmp.new_cipher;
744                         if (!s->method->ssl3_enc->setup_key_block(s))
745                                 { ret= -1; goto end; }
746
747                         ret=ssl3_send_change_cipher_spec(s,
748                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
749
750                         if (ret <= 0) goto end;
751                         s->state=SSL3_ST_SW_FINISHED_A;
752                         s->init_num=0;
753
754                         if (!s->method->ssl3_enc->change_cipher_state(s,
755                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
756                                 {
757                                 ret= -1;
758                                 goto end;
759                                 }
760
761                         break;
762
763                 case SSL3_ST_SW_FINISHED_A:
764                 case SSL3_ST_SW_FINISHED_B:
765                         ret=ssl3_send_finished(s,
766                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
767                                 s->method->ssl3_enc->server_finished_label,
768                                 s->method->ssl3_enc->server_finished_label_len);
769                         if (ret <= 0) goto end;
770                         s->state=SSL3_ST_SW_FLUSH;
771                         if (s->hit)
772                                 {
773 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
774                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
775 #else
776                                 if (s->s3->next_proto_neg_seen)
777                                         {
778                                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
779                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
780                                         }
781                                 else
782                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
783 #endif
784                                 }
785                         else
786                                 s->s3->tmp.next_state=SSL_ST_OK;
787                         s->init_num=0;
788                         break;
789
790                 case SSL_ST_OK:
791                         /* clean a few things up */
792                         ssl3_cleanup_key_block(s);
793
794                         BUF_MEM_free(s->init_buf);
795                         s->init_buf=NULL;
796
797                         /* remove buffering on output */
798                         ssl_free_wbio_buffer(s);
799
800                         s->init_num=0;
801
802                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
803                                 {
804                                 s->renegotiate=0;
805                                 s->new_session=0;
806                                 
807                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
808                                 
809                                 s->ctx->stats.sess_accept_good++;
810                                 /* s->server=1; */
811                                 s->handshake_func=ssl3_accept;
812
813                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
814                                 }
815                         
816                         ret = 1;
817                         goto end;
818                         /* break; */
819
820                 default:
821                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
822                         ret= -1;
823                         goto end;
824                         /* break; */
825                         }
826                 
827                 if (!s->s3->tmp.reuse_message && !skip)
828                         {
829                         if (s->debug)
830                                 {
831                                 if ((ret=BIO_flush(s->wbio)) <= 0)
832                                         goto end;
833                                 }
834
835
836                         if ((cb != NULL) && (s->state != state))
837                                 {
838                                 new_state=s->state;
839                                 s->state=state;
840                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
841                                 s->state=new_state;
842                                 }
843                         }
844                 skip=0;
845                 }
846 end:
847         /* BIO_flush(s->wbio); */
848
849         s->in_handshake--;
850         if (cb != NULL)
851                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
852         return(ret);
853         }
854
855 int ssl3_send_hello_request(SSL *s)
856         {
857         unsigned char *p;
858
859         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
860                 {
861                 p=(unsigned char *)s->init_buf->data;
862                 *(p++)=SSL3_MT_HELLO_REQUEST;
863                 *(p++)=0;
864                 *(p++)=0;
865                 *(p++)=0;
866
867                 s->state=SSL3_ST_SW_HELLO_REQ_B;
868                 /* number of bytes to write */
869                 s->init_num=4;
870                 s->init_off=0;
871                 }
872
873         /* SSL3_ST_SW_HELLO_REQ_B */
874         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
875         }
876
877 int ssl3_check_client_hello(SSL *s)
878         {
879         int ok;
880         long n;
881
882         /* this function is called when we really expect a Certificate message,
883          * so permit appropriate message length */
884         n=s->method->ssl_get_message(s,
885                 SSL3_ST_SR_CERT_A,
886                 SSL3_ST_SR_CERT_B,
887                 -1,
888                 s->max_cert_list,
889                 &ok);
890         if (!ok) return((int)n);
891         s->s3->tmp.reuse_message = 1;
892         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
893                 {
894                 /* We only allow the client to restart the handshake once per
895                  * negotiation. */
896                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
897                         {
898                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
899                         return -1;
900                         }
901                 /* Throw away what we have done so far in the current handshake,
902                  * which will now be aborted. (A full SSL_clear would be too much.) */
903 #ifndef OPENSSL_NO_DH
904                 if (s->s3->tmp.dh != NULL)
905                         {
906                         DH_free(s->s3->tmp.dh);
907                         s->s3->tmp.dh = NULL;
908                         }
909 #endif
910 #ifndef OPENSSL_NO_ECDH
911                 if (s->s3->tmp.ecdh != NULL)
912                         {
913                         EC_KEY_free(s->s3->tmp.ecdh);
914                         s->s3->tmp.ecdh = NULL;
915                         }
916 #endif
917                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
918                 return 2;
919                 }
920         return 1;
921 }
922
923 int ssl3_get_client_hello(SSL *s)
924         {
925         int i,j,ok,al,ret= -1;
926         unsigned int cookie_len;
927         long n;
928         unsigned long id;
929         unsigned char *p,*d,*q;
930         SSL_CIPHER *c;
931 #ifndef OPENSSL_NO_COMP
932         SSL_COMP *comp=NULL;
933 #endif
934         STACK_OF(SSL_CIPHER) *ciphers=NULL;
935
936         /* We do this so that we will respond with our native type.
937          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
938          * This down switching should be handled by a different method.
939          * If we are SSLv3, we will respond with SSLv3, even if prompted with
940          * TLSv1.
941          */
942         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
943                 )
944                 {
945                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
946                 }
947         s->first_packet=1;
948         n=s->method->ssl_get_message(s,
949                 SSL3_ST_SR_CLNT_HELLO_B,
950                 SSL3_ST_SR_CLNT_HELLO_C,
951                 SSL3_MT_CLIENT_HELLO,
952                 SSL3_RT_MAX_PLAIN_LENGTH,
953                 &ok);
954
955         if (!ok) return((int)n);
956         s->first_packet=0;
957         d=p=(unsigned char *)s->init_msg;
958
959         /* use version from inside client hello, not from record header
960          * (may differ: see RFC 2246, Appendix E, second paragraph) */
961         s->client_version=(((int)p[0])<<8)|(int)p[1];
962         p+=2;
963
964         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
965             (s->version != DTLS1_VERSION && s->client_version < s->version))
966                 {
967                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
968                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR && 
969                         !s->enc_write_ctx && !s->write_hash)
970                         {
971                         /* similar to ssl3_get_record, send alert using remote version number */
972                         s->version = s->client_version;
973                         }
974                 al = SSL_AD_PROTOCOL_VERSION;
975                 goto f_err;
976                 }
977
978         /* If we require cookies and this ClientHello doesn't
979          * contain one, just return since we do not want to
980          * allocate any memory yet. So check cookie length...
981          */
982         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
983                 {
984                 unsigned int session_length, cookie_length;
985                 
986                 session_length = *(p + SSL3_RANDOM_SIZE);
987                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
988
989                 if (cookie_length == 0)
990                         return 1;
991                 }
992
993         /* load the client random */
994         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
995         p+=SSL3_RANDOM_SIZE;
996
997         /* get the session-id */
998         j= *(p++);
999
1000         s->hit=0;
1001         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1002          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1003          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1004          * than a change to default behavior so that applications relying on this for security
1005          * won't even compile against older library versions).
1006          *
1007          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1008          * renegotiation but not a new session (s->new_session remains unset): for servers,
1009          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1010          * setting will be ignored.
1011          */
1012         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1013                 {
1014                 if (!ssl_get_new_session(s,1))
1015                         goto err;
1016                 }
1017         else
1018                 {
1019                 i=ssl_get_prev_session(s, p, j, d + n);
1020                 if (i == 1)
1021                         { /* previous session */
1022                         s->hit=1;
1023                         }
1024                 else if (i == -1)
1025                         goto err;
1026                 else /* i == 0 */
1027                         {
1028                         if (!ssl_get_new_session(s,1))
1029                                 goto err;
1030                         }
1031                 }
1032
1033         p+=j;
1034
1035         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1036                 {
1037                 /* cookie stuff */
1038                 cookie_len = *(p++);
1039
1040                 /* 
1041                  * The ClientHello may contain a cookie even if the
1042                  * HelloVerify message has not been sent--make sure that it
1043                  * does not cause an overflow.
1044                  */
1045                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1046                         {
1047                         /* too much data */
1048                         al = SSL_AD_DECODE_ERROR;
1049                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1050                         goto f_err;
1051                         }
1052
1053                 /* verify the cookie if appropriate option is set. */
1054                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1055                         cookie_len > 0)
1056                         {
1057                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1058
1059                         if ( s->ctx->app_verify_cookie_cb != NULL)
1060                                 {
1061                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1062                                         cookie_len) == 0)
1063                                         {
1064                                         al=SSL_AD_HANDSHAKE_FAILURE;
1065                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1066                                                 SSL_R_COOKIE_MISMATCH);
1067                                         goto f_err;
1068                                         }
1069                                 /* else cookie verification succeeded */
1070                                 }
1071                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1072                                                   s->d1->cookie_len) != 0) /* default verification */
1073                                 {
1074                                         al=SSL_AD_HANDSHAKE_FAILURE;
1075                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1076                                                 SSL_R_COOKIE_MISMATCH);
1077                                         goto f_err;
1078                                 }
1079
1080                         ret = 2;
1081                         }
1082
1083                 p += cookie_len;
1084                 }
1085
1086         n2s(p,i);
1087         if ((i == 0) && (j != 0))
1088                 {
1089                 /* we need a cipher if we are not resuming a session */
1090                 al=SSL_AD_ILLEGAL_PARAMETER;
1091                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1092                 goto f_err;
1093                 }
1094         if ((p+i) >= (d+n))
1095                 {
1096                 /* not enough data */
1097                 al=SSL_AD_DECODE_ERROR;
1098                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1099                 goto f_err;
1100                 }
1101         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1102                 == NULL))
1103                 {
1104                 goto err;
1105                 }
1106         p+=i;
1107
1108         /* If it is a hit, check that the cipher is in the list */
1109         if ((s->hit) && (i > 0))
1110                 {
1111                 j=0;
1112                 id=s->session->cipher->id;
1113
1114 #ifdef CIPHER_DEBUG
1115                 printf("client sent %d ciphers\n",sk_num(ciphers));
1116 #endif
1117                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1118                         {
1119                         c=sk_SSL_CIPHER_value(ciphers,i);
1120 #ifdef CIPHER_DEBUG
1121                         printf("client [%2d of %2d]:%s\n",
1122                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1123 #endif
1124                         if (c->id == id)
1125                                 {
1126                                 j=1;
1127                                 break;
1128                                 }
1129                         }
1130 /* Disabled because it can be used in a ciphersuite downgrade
1131  * attack: CVE-2010-4180.
1132  */
1133 #if 0
1134                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1135                         {
1136                         /* Special case as client bug workaround: the previously used cipher may
1137                          * not be in the current list, the client instead might be trying to
1138                          * continue using a cipher that before wasn't chosen due to server
1139                          * preferences.  We'll have to reject the connection if the cipher is not
1140                          * enabled, though. */
1141                         c = sk_SSL_CIPHER_value(ciphers, 0);
1142                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1143                                 {
1144                                 s->session->cipher = c;
1145                                 j = 1;
1146                                 }
1147                         }
1148 #endif
1149                 if (j == 0)
1150                         {
1151                         /* we need to have the cipher in the cipher
1152                          * list if we are asked to reuse it */
1153                         al=SSL_AD_ILLEGAL_PARAMETER;
1154                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1155                         goto f_err;
1156                         }
1157                 }
1158
1159         /* compression */
1160         i= *(p++);
1161         if ((p+i) > (d+n))
1162                 {
1163                 /* not enough data */
1164                 al=SSL_AD_DECODE_ERROR;
1165                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1166                 goto f_err;
1167                 }
1168         q=p;
1169         for (j=0; j<i; j++)
1170                 {
1171                 if (p[j] == 0) break;
1172                 }
1173
1174         p+=i;
1175         if (j >= i)
1176                 {
1177                 /* no compress */
1178                 al=SSL_AD_DECODE_ERROR;
1179                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1180                 goto f_err;
1181                 }
1182
1183 #ifndef OPENSSL_NO_TLSEXT
1184         /* TLS extensions*/
1185         if (s->version >= SSL3_VERSION)
1186                 {
1187                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1188                         {
1189                         /* 'al' set by ssl_parse_clienthello_tlsext */
1190                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1191                         goto f_err;
1192                         }
1193                 }
1194                 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1195                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1196                         goto err;
1197                 }
1198
1199         /* Check if we want to use external pre-shared secret for this
1200          * handshake for not reused session only. We need to generate
1201          * server_random before calling tls_session_secret_cb in order to allow
1202          * SessionTicket processing to use it in key derivation. */
1203         {
1204                 unsigned char *pos;
1205                 pos=s->s3->server_random;
1206                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1207                         {
1208                         al=SSL_AD_INTERNAL_ERROR;
1209                         goto f_err;
1210                         }
1211         }
1212
1213         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1214                 {
1215                 SSL_CIPHER *pref_cipher=NULL;
1216
1217                 s->session->master_key_length=sizeof(s->session->master_key);
1218                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1219                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1220                         {
1221                         s->hit=1;
1222                         s->session->ciphers=ciphers;
1223                         s->session->verify_result=X509_V_OK;
1224
1225                         ciphers=NULL;
1226
1227                         /* check if some cipher was preferred by call back */
1228                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1229                         if (pref_cipher == NULL)
1230                                 {
1231                                 al=SSL_AD_HANDSHAKE_FAILURE;
1232                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1233                                 goto f_err;
1234                                 }
1235
1236                         s->session->cipher=pref_cipher;
1237
1238                         if (s->cipher_list)
1239                                 sk_SSL_CIPHER_free(s->cipher_list);
1240
1241                         if (s->cipher_list_by_id)
1242                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1243
1244                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1245                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1246                         }
1247                 }
1248 #endif
1249
1250         /* Worst case, we will use the NULL compression, but if we have other
1251          * options, we will now look for them.  We have i-1 compression
1252          * algorithms from the client, starting at q. */
1253         s->s3->tmp.new_compression=NULL;
1254 #ifndef OPENSSL_NO_COMP
1255         /* This only happens if we have a cache hit */
1256         if (s->session->compress_meth != 0)
1257                 {
1258                 int m, comp_id = s->session->compress_meth;
1259                 /* Perform sanity checks on resumed compression algorithm */
1260                 /* Can't disable compression */
1261                 if (s->options & SSL_OP_NO_COMPRESSION)
1262                         {
1263                         al=SSL_AD_INTERNAL_ERROR;
1264                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1265                         goto f_err;
1266                         }
1267                 /* Look for resumed compression method */
1268                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1269                         {
1270                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1271                         if (comp_id == comp->id)
1272                                 {
1273                                 s->s3->tmp.new_compression=comp;
1274                                 break;
1275                                 }
1276                         }
1277                 if (s->s3->tmp.new_compression == NULL)
1278                         {
1279                         al=SSL_AD_INTERNAL_ERROR;
1280                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1281                         goto f_err;
1282                         }
1283                 /* Look for resumed method in compression list */
1284                 for (m = 0; m < i; m++)
1285                         {
1286                         if (q[m] == comp_id)
1287                                 break;
1288                         }
1289                 if (m >= i)
1290                         {
1291                         al=SSL_AD_ILLEGAL_PARAMETER;
1292                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1293                         goto f_err;
1294                         }
1295                 }
1296         else if (s->hit)
1297                 comp = NULL;
1298         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1299                 { /* See if we have a match */
1300                 int m,nn,o,v,done=0;
1301
1302                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1303                 for (m=0; m<nn; m++)
1304                         {
1305                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1306                         v=comp->id;
1307                         for (o=0; o<i; o++)
1308                                 {
1309                                 if (v == q[o])
1310                                         {
1311                                         done=1;
1312                                         break;
1313                                         }
1314                                 }
1315                         if (done) break;
1316                         }
1317                 if (done)
1318                         s->s3->tmp.new_compression=comp;
1319                 else
1320                         comp=NULL;
1321                 }
1322 #else
1323         /* If compression is disabled we'd better not try to resume a session
1324          * using compression.
1325          */
1326         if (s->session->compress_meth != 0)
1327                 {
1328                 al=SSL_AD_INTERNAL_ERROR;
1329                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1330                 goto f_err;
1331                 }
1332 #endif
1333
1334         /* Given s->session->ciphers and SSL_get_ciphers, we must
1335          * pick a cipher */
1336
1337         if (!s->hit)
1338                 {
1339 #ifdef OPENSSL_NO_COMP
1340                 s->session->compress_meth=0;
1341 #else
1342                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1343 #endif
1344                 if (s->session->ciphers != NULL)
1345                         sk_SSL_CIPHER_free(s->session->ciphers);
1346                 s->session->ciphers=ciphers;
1347                 if (ciphers == NULL)
1348                         {
1349                         al=SSL_AD_ILLEGAL_PARAMETER;
1350                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1351                         goto f_err;
1352                         }
1353                 ciphers=NULL;
1354                 c=ssl3_choose_cipher(s,s->session->ciphers,
1355                                      SSL_get_ciphers(s));
1356
1357                 if (c == NULL)
1358                         {
1359                         al=SSL_AD_HANDSHAKE_FAILURE;
1360                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1361                         goto f_err;
1362                         }
1363                 s->s3->tmp.new_cipher=c;
1364                 }
1365         else
1366                 {
1367                 /* Session-id reuse */
1368 #ifdef REUSE_CIPHER_BUG
1369                 STACK_OF(SSL_CIPHER) *sk;
1370                 SSL_CIPHER *nc=NULL;
1371                 SSL_CIPHER *ec=NULL;
1372
1373                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1374                         {
1375                         sk=s->session->ciphers;
1376                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1377                                 {
1378                                 c=sk_SSL_CIPHER_value(sk,i);
1379                                 if (c->algorithm_enc & SSL_eNULL)
1380                                         nc=c;
1381                                 if (SSL_C_IS_EXPORT(c))
1382                                         ec=c;
1383                                 }
1384                         if (nc != NULL)
1385                                 s->s3->tmp.new_cipher=nc;
1386                         else if (ec != NULL)
1387                                 s->s3->tmp.new_cipher=ec;
1388                         else
1389                                 s->s3->tmp.new_cipher=s->session->cipher;
1390                         }
1391                 else
1392 #endif
1393                 s->s3->tmp.new_cipher=s->session->cipher;
1394                 }
1395
1396         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1397                 {
1398                 if (!ssl3_digest_cached_records(s))
1399                         {
1400                         al = SSL_AD_INTERNAL_ERROR;
1401                         goto f_err;
1402                         }
1403                 }
1404         
1405         /* we now have the following setup. 
1406          * client_random
1407          * cipher_list          - our prefered list of ciphers
1408          * ciphers              - the clients prefered list of ciphers
1409          * compression          - basically ignored right now
1410          * ssl version is set   - sslv3
1411          * s->session           - The ssl session has been setup.
1412          * s->hit               - session reuse flag
1413          * s->tmp.new_cipher    - the new cipher to use.
1414          */
1415
1416         /* Handles TLS extensions that we couldn't check earlier */
1417         if (s->version >= SSL3_VERSION)
1418                 {
1419                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1420                         {
1421                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1422                         goto err;
1423                         }
1424                 }
1425
1426         if (ret < 0) ret=1;
1427         if (0)
1428                 {
1429 f_err:
1430                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1431                 }
1432 err:
1433         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1434         return(ret);
1435         }
1436
1437 int ssl3_send_server_hello(SSL *s)
1438         {
1439         unsigned char *buf;
1440         unsigned char *p,*d;
1441         int i,sl;
1442         unsigned long l;
1443
1444         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1445                 {
1446                 buf=(unsigned char *)s->init_buf->data;
1447 #ifdef OPENSSL_NO_TLSEXT
1448                 p=s->s3->server_random;
1449                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1450                         return -1;
1451 #endif
1452                 /* Do the message type and length last */
1453                 d=p= &(buf[4]);
1454
1455                 *(p++)=s->version>>8;
1456                 *(p++)=s->version&0xff;
1457
1458                 /* Random stuff */
1459                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1460                 p+=SSL3_RANDOM_SIZE;
1461
1462                 /* There are several cases for the session ID to send
1463                  * back in the server hello:
1464                  * - For session reuse from the session cache,
1465                  *   we send back the old session ID.
1466                  * - If stateless session reuse (using a session ticket)
1467                  *   is successful, we send back the client's "session ID"
1468                  *   (which doesn't actually identify the session).
1469                  * - If it is a new session, we send back the new
1470                  *   session ID.
1471                  * - However, if we want the new session to be single-use,
1472                  *   we send back a 0-length session ID.
1473                  * s->hit is non-zero in either case of session reuse,
1474                  * so the following won't overwrite an ID that we're supposed
1475                  * to send back.
1476                  */
1477                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1478                         && !s->hit)
1479                         s->session->session_id_length=0;
1480
1481                 sl=s->session->session_id_length;
1482                 if (sl > (int)sizeof(s->session->session_id))
1483                         {
1484                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1485                         return -1;
1486                         }
1487                 *(p++)=sl;
1488                 memcpy(p,s->session->session_id,sl);
1489                 p+=sl;
1490
1491                 /* put the cipher */
1492                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1493                 p+=i;
1494
1495                 /* put the compression method */
1496 #ifdef OPENSSL_NO_COMP
1497                         *(p++)=0;
1498 #else
1499                 if (s->s3->tmp.new_compression == NULL)
1500                         *(p++)=0;
1501                 else
1502                         *(p++)=s->s3->tmp.new_compression->id;
1503 #endif
1504 #ifndef OPENSSL_NO_TLSEXT
1505                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1506                         {
1507                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1508                         return -1;
1509                         }
1510                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1511                         {
1512                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1513                         return -1;
1514                         }
1515 #endif
1516                 /* do the header */
1517                 l=(p-d);
1518                 d=buf;
1519                 *(d++)=SSL3_MT_SERVER_HELLO;
1520                 l2n3(l,d);
1521
1522                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1523                 /* number of bytes to write */
1524                 s->init_num=p-buf;
1525                 s->init_off=0;
1526                 }
1527
1528         /* SSL3_ST_SW_SRVR_HELLO_B */
1529         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1530         }
1531
1532 int ssl3_send_server_done(SSL *s)
1533         {
1534         unsigned char *p;
1535
1536         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1537                 {
1538                 p=(unsigned char *)s->init_buf->data;
1539
1540                 /* do the header */
1541                 *(p++)=SSL3_MT_SERVER_DONE;
1542                 *(p++)=0;
1543                 *(p++)=0;
1544                 *(p++)=0;
1545
1546                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1547                 /* number of bytes to write */
1548                 s->init_num=4;
1549                 s->init_off=0;
1550                 }
1551
1552         /* SSL3_ST_SW_SRVR_DONE_B */
1553         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1554         }
1555
1556 int ssl3_send_server_key_exchange(SSL *s)
1557         {
1558 #ifndef OPENSSL_NO_RSA
1559         unsigned char *q;
1560         int j,num;
1561         RSA *rsa;
1562         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1563         unsigned int u;
1564 #endif
1565 #ifndef OPENSSL_NO_DH
1566         DH *dh=NULL,*dhp;
1567 #endif
1568 #ifndef OPENSSL_NO_ECDH
1569         EC_KEY *ecdh=NULL, *ecdhp;
1570         unsigned char *encodedPoint = NULL;
1571         int encodedlen = 0;
1572         int curve_id = 0;
1573         BN_CTX *bn_ctx = NULL; 
1574 #endif
1575         EVP_PKEY *pkey;
1576         const EVP_MD *md = NULL;
1577         unsigned char *p,*d;
1578         int al,i;
1579         unsigned long type;
1580         int n;
1581         CERT *cert;
1582         BIGNUM *r[4];
1583         int nr[4],kn;
1584         BUF_MEM *buf;
1585         EVP_MD_CTX md_ctx;
1586
1587         EVP_MD_CTX_init(&md_ctx);
1588         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1589                 {
1590                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1591                 cert=s->cert;
1592
1593                 buf=s->init_buf;
1594
1595                 r[0]=r[1]=r[2]=r[3]=NULL;
1596                 n=0;
1597 #ifndef OPENSSL_NO_RSA
1598                 if (type & SSL_kRSA)
1599                         {
1600                         rsa=cert->rsa_tmp;
1601                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1602                                 {
1603                                 rsa=s->cert->rsa_tmp_cb(s,
1604                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1605                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1606                                 if(rsa == NULL)
1607                                 {
1608                                         al=SSL_AD_HANDSHAKE_FAILURE;
1609                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1610                                         goto f_err;
1611                                 }
1612                                 RSA_up_ref(rsa);
1613                                 cert->rsa_tmp=rsa;
1614                                 }
1615                         if (rsa == NULL)
1616                                 {
1617                                 al=SSL_AD_HANDSHAKE_FAILURE;
1618                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1619                                 goto f_err;
1620                                 }
1621                         r[0]=rsa->n;
1622                         r[1]=rsa->e;
1623                         s->s3->tmp.use_rsa_tmp=1;
1624                         }
1625                 else
1626 #endif
1627 #ifndef OPENSSL_NO_DH
1628                         if (type & SSL_kEDH)
1629                         {
1630                         dhp=cert->dh_tmp;
1631                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1632                                 dhp=s->cert->dh_tmp_cb(s,
1633                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1634                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1635                         if (dhp == NULL)
1636                                 {
1637                                 al=SSL_AD_HANDSHAKE_FAILURE;
1638                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1639                                 goto f_err;
1640                                 }
1641
1642                         if (s->s3->tmp.dh != NULL)
1643                                 {
1644                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1645                                 goto err;
1646                                 }
1647
1648                         if ((dh=DHparams_dup(dhp)) == NULL)
1649                                 {
1650                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1651                                 goto err;
1652                                 }
1653
1654                         s->s3->tmp.dh=dh;
1655                         if ((dhp->pub_key == NULL ||
1656                              dhp->priv_key == NULL ||
1657                              (s->options & SSL_OP_SINGLE_DH_USE)))
1658                                 {
1659                                 if(!DH_generate_key(dh))
1660                                     {
1661                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1662                                            ERR_R_DH_LIB);
1663                                     goto err;
1664                                     }
1665                                 }
1666                         else
1667                                 {
1668                                 dh->pub_key=BN_dup(dhp->pub_key);
1669                                 dh->priv_key=BN_dup(dhp->priv_key);
1670                                 if ((dh->pub_key == NULL) ||
1671                                         (dh->priv_key == NULL))
1672                                         {
1673                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1674                                         goto err;
1675                                         }
1676                                 }
1677                         r[0]=dh->p;
1678                         r[1]=dh->g;
1679                         r[2]=dh->pub_key;
1680                         }
1681                 else 
1682 #endif
1683 #ifndef OPENSSL_NO_ECDH
1684                         if (type & SSL_kEECDH)
1685                         {
1686                         const EC_GROUP *group;
1687
1688                         ecdhp=cert->ecdh_tmp;
1689                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1690                                 {
1691                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1692                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1693                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1694                                 }
1695                         if (ecdhp == NULL)
1696                                 {
1697                                 al=SSL_AD_HANDSHAKE_FAILURE;
1698                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1699                                 goto f_err;
1700                                 }
1701
1702                         if (s->s3->tmp.ecdh != NULL)
1703                                 {
1704                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1705                                 goto err;
1706                                 }
1707
1708                         /* Duplicate the ECDH structure. */
1709                         if (ecdhp == NULL)
1710                                 {
1711                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1712                                 goto err;
1713                                 }
1714                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1715                                 {
1716                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1717                                 goto err;
1718                                 }
1719
1720                         s->s3->tmp.ecdh=ecdh;
1721                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1722                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1723                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1724                                 {
1725                                 if(!EC_KEY_generate_key(ecdh))
1726                                     {
1727                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1728                                     goto err;
1729                                     }
1730                                 }
1731
1732                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1733                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1734                             (EC_KEY_get0_private_key(ecdh) == NULL))
1735                                 {
1736                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1737                                 goto err;
1738                                 }
1739
1740                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1741                             (EC_GROUP_get_degree(group) > 163)) 
1742                                 {
1743                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1744                                 goto err;
1745                                 }
1746
1747                         /* XXX: For now, we only support ephemeral ECDH
1748                          * keys over named (not generic) curves. For 
1749                          * supported named curves, curve_id is non-zero.
1750                          */
1751                         if ((curve_id = 
1752                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1753                             == 0)
1754                                 {
1755                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1756                                 goto err;
1757                                 }
1758
1759                         /* Encode the public key.
1760                          * First check the size of encoding and
1761                          * allocate memory accordingly.
1762                          */
1763                         encodedlen = EC_POINT_point2oct(group, 
1764                             EC_KEY_get0_public_key(ecdh),
1765                             POINT_CONVERSION_UNCOMPRESSED, 
1766                             NULL, 0, NULL);
1767
1768                         encodedPoint = (unsigned char *) 
1769                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1770                         bn_ctx = BN_CTX_new();
1771                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1772                                 {
1773                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1774                                 goto err;
1775                                 }
1776
1777
1778                         encodedlen = EC_POINT_point2oct(group, 
1779                             EC_KEY_get0_public_key(ecdh), 
1780                             POINT_CONVERSION_UNCOMPRESSED, 
1781                             encodedPoint, encodedlen, bn_ctx);
1782
1783                         if (encodedlen == 0) 
1784                                 {
1785                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1786                                 goto err;
1787                                 }
1788
1789                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1790
1791                         /* XXX: For now, we only support named (not 
1792                          * generic) curves in ECDH ephemeral key exchanges.
1793                          * In this situation, we need four additional bytes
1794                          * to encode the entire ServerECDHParams
1795                          * structure. 
1796                          */
1797                         n = 4 + encodedlen;
1798
1799                         /* We'll generate the serverKeyExchange message
1800                          * explicitly so we can set these to NULLs
1801                          */
1802                         r[0]=NULL;
1803                         r[1]=NULL;
1804                         r[2]=NULL;
1805                         r[3]=NULL;
1806                         }
1807                 else 
1808 #endif /* !OPENSSL_NO_ECDH */
1809 #ifndef OPENSSL_NO_PSK
1810                         if (type & SSL_kPSK)
1811                                 {
1812                                 /* reserve size for record length and PSK identity hint*/
1813                                 n+=2+strlen(s->ctx->psk_identity_hint);
1814                                 }
1815                         else
1816 #endif /* !OPENSSL_NO_PSK */
1817 #ifndef OPENSSL_NO_SRP
1818                 if (type & SSL_kSRP)
1819                         {
1820                         if ((s->srp_ctx.N == NULL) ||
1821                                 (s->srp_ctx.g == NULL) ||
1822                                 (s->srp_ctx.s == NULL) ||
1823                                 (s->srp_ctx.B == NULL))
1824                                 {
1825                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1826                                 goto err;
1827                                 }
1828                         r[0]=s->srp_ctx.N;
1829                         r[1]=s->srp_ctx.g;
1830                         r[2]=s->srp_ctx.s;
1831                         r[3]=s->srp_ctx.B;
1832                         }
1833                 else 
1834 #endif
1835                         {
1836                         al=SSL_AD_HANDSHAKE_FAILURE;
1837                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1838                         goto f_err;
1839                         }
1840                 for (i=0; i < 4 && r[i] != NULL; i++)
1841                         {
1842                         nr[i]=BN_num_bytes(r[i]);
1843 #ifndef OPENSSL_NO_SRP
1844                         if ((i == 2) && (type & SSL_kSRP))
1845                                 n+=1+nr[i];
1846                         else
1847 #endif
1848                         n+=2+nr[i];
1849                         }
1850
1851                 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1852                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1853                         {
1854                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1855                                 == NULL)
1856                                 {
1857                                 al=SSL_AD_DECODE_ERROR;
1858                                 goto f_err;
1859                                 }
1860                         kn=EVP_PKEY_size(pkey);
1861                         }
1862                 else
1863                         {
1864                         pkey=NULL;
1865                         kn=0;
1866                         }
1867
1868                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1869                         {
1870                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1871                         goto err;
1872                         }
1873                 d=(unsigned char *)s->init_buf->data;
1874                 p= &(d[4]);
1875
1876                 for (i=0; i < 4 && r[i] != NULL; i++)
1877                         {
1878 #ifndef OPENSSL_NO_SRP
1879                         if ((i == 2) && (type & SSL_kSRP))
1880                                 {
1881                                 *p = nr[i];
1882                                 p++;
1883                                 }
1884                         else
1885 #endif
1886                         s2n(nr[i],p);
1887                         BN_bn2bin(r[i],p);
1888                         p+=nr[i];
1889                         }
1890
1891 #ifndef OPENSSL_NO_ECDH
1892                 if (type & SSL_kEECDH) 
1893                         {
1894                         /* XXX: For now, we only support named (not generic) curves.
1895                          * In this situation, the serverKeyExchange message has:
1896                          * [1 byte CurveType], [2 byte CurveName]
1897                          * [1 byte length of encoded point], followed by
1898                          * the actual encoded point itself
1899                          */
1900                         *p = NAMED_CURVE_TYPE;
1901                         p += 1;
1902                         *p = 0;
1903                         p += 1;
1904                         *p = curve_id;
1905                         p += 1;
1906                         *p = encodedlen;
1907                         p += 1;
1908                         memcpy((unsigned char*)p, 
1909                             (unsigned char *)encodedPoint, 
1910                             encodedlen);
1911                         OPENSSL_free(encodedPoint);
1912                         encodedPoint = NULL;
1913                         p += encodedlen;
1914                         }
1915 #endif
1916
1917 #ifndef OPENSSL_NO_PSK
1918                 if (type & SSL_kPSK)
1919                         {
1920                         /* copy PSK identity hint */
1921                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1922                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1923                         p+=strlen(s->ctx->psk_identity_hint);
1924                         }
1925 #endif
1926
1927                 /* not anonymous */
1928                 if (pkey != NULL)
1929                         {
1930                         /* n is the length of the params, they start at &(d[4])
1931                          * and p points to the space at the end. */
1932 #ifndef OPENSSL_NO_RSA
1933                         if (pkey->type == EVP_PKEY_RSA
1934                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1935                                 {
1936                                 q=md_buf;
1937                                 j=0;
1938                                 for (num=2; num > 0; num--)
1939                                         {
1940                                         EVP_MD_CTX_set_flags(&md_ctx,
1941                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1942                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1943                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1944                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1945                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1946                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1947                                         EVP_DigestFinal_ex(&md_ctx,q,
1948                                                 (unsigned int *)&i);
1949                                         q+=i;
1950                                         j+=i;
1951                                         }
1952                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1953                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1954                                         {
1955                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1956                                         goto err;
1957                                         }
1958                                 s2n(u,p);
1959                                 n+=u+2;
1960                                 }
1961                         else
1962 #endif
1963                         if (md)
1964                                 {
1965                                 /* For TLS1.2 and later send signature
1966                                  * algorithm */
1967                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1968                                         {
1969                                         if (!tls12_get_sigandhash(p, pkey, md))
1970                                                 {
1971                                                 /* Should never happen */
1972                                                 al=SSL_AD_INTERNAL_ERROR;
1973                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1974                                                 goto f_err;
1975                                                 }
1976                                         p+=2;
1977                                         }
1978 #ifdef SSL_DEBUG
1979                                 fprintf(stderr, "Using hash %s\n",
1980                                                         EVP_MD_name(md));
1981 #endif
1982                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1983                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1984                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1985                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1986                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1987                                         (unsigned int *)&i,pkey))
1988                                         {
1989                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1990                                         goto err;
1991                                         }
1992                                 s2n(i,p);
1993                                 n+=i+2;
1994                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1995                                         n+= 2;
1996                                 }
1997                         else
1998                                 {
1999                                 /* Is this error check actually needed? */
2000                                 al=SSL_AD_HANDSHAKE_FAILURE;
2001                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2002                                 goto f_err;
2003                                 }
2004                         }
2005
2006                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2007                 l2n3(n,d);
2008
2009                 /* we should now have things packed up, so lets send
2010                  * it off */
2011                 s->init_num=n+4;
2012                 s->init_off=0;
2013                 }
2014
2015         s->state = SSL3_ST_SW_KEY_EXCH_B;
2016         EVP_MD_CTX_cleanup(&md_ctx);
2017         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2018 f_err:
2019         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2020 err:
2021 #ifndef OPENSSL_NO_ECDH
2022         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2023         BN_CTX_free(bn_ctx);
2024 #endif
2025         EVP_MD_CTX_cleanup(&md_ctx);
2026         return(-1);
2027         }
2028
2029 int ssl3_send_certificate_request(SSL *s)
2030         {
2031         unsigned char *p,*d;
2032         int i,j,nl,off,n;
2033         STACK_OF(X509_NAME) *sk=NULL;
2034         X509_NAME *name;
2035         BUF_MEM *buf;
2036
2037         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2038                 {
2039                 buf=s->init_buf;
2040
2041                 d=p=(unsigned char *)&(buf->data[4]);
2042
2043                 /* get the list of acceptable cert types */
2044                 p++;
2045                 n=ssl3_get_req_cert_type(s,p);
2046                 d[0]=n;
2047                 p+=n;
2048                 n++;
2049
2050                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2051                         {
2052                         nl = tls12_get_req_sig_algs(s, p + 2);
2053                         s2n(nl, p);
2054                         p += nl + 2;
2055                         n += nl + 2;
2056                         }
2057
2058                 off=n;
2059                 p+=2;
2060                 n+=2;
2061
2062                 sk=SSL_get_client_CA_list(s);
2063                 nl=0;
2064                 if (sk != NULL)
2065                         {
2066                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2067                                 {
2068                                 name=sk_X509_NAME_value(sk,i);
2069                                 j=i2d_X509_NAME(name,NULL);
2070                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2071                                         {
2072                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2073                                         goto err;
2074                                         }
2075                                 p=(unsigned char *)&(buf->data[4+n]);
2076                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2077                                         {
2078                                         s2n(j,p);
2079                                         i2d_X509_NAME(name,&p);
2080                                         n+=2+j;
2081                                         nl+=2+j;
2082                                         }
2083                                 else
2084                                         {
2085                                         d=p;
2086                                         i2d_X509_NAME(name,&p);
2087                                         j-=2; s2n(j,d); j+=2;
2088                                         n+=j;
2089                                         nl+=j;
2090                                         }
2091                                 }
2092                         }
2093                 /* else no CA names */
2094                 p=(unsigned char *)&(buf->data[4+off]);
2095                 s2n(nl,p);
2096
2097                 d=(unsigned char *)buf->data;
2098                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2099                 l2n3(n,d);
2100
2101                 /* we should now have things packed up, so lets send
2102                  * it off */
2103
2104                 s->init_num=n+4;
2105                 s->init_off=0;
2106 #ifdef NETSCAPE_HANG_BUG
2107                 if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2108                         {
2109                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2110                         goto err;
2111                         }
2112                 p=(unsigned char *)s->init_buf->data + s->init_num;
2113
2114                 /* do the header */
2115                 *(p++)=SSL3_MT_SERVER_DONE;
2116                 *(p++)=0;
2117                 *(p++)=0;
2118                 *(p++)=0;
2119                 s->init_num += 4;
2120 #endif
2121
2122                 s->state = SSL3_ST_SW_CERT_REQ_B;
2123                 }
2124
2125         /* SSL3_ST_SW_CERT_REQ_B */
2126         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2127 err:
2128         return(-1);
2129         }
2130
2131 int ssl3_get_client_key_exchange(SSL *s)
2132         {
2133         int i,al,ok;
2134         long n;
2135         unsigned long alg_k;
2136         unsigned char *p;
2137 #ifndef OPENSSL_NO_RSA
2138         RSA *rsa=NULL;
2139         EVP_PKEY *pkey=NULL;
2140 #endif
2141 #ifndef OPENSSL_NO_DH
2142         BIGNUM *pub=NULL;
2143         DH *dh_srvr;
2144 #endif
2145 #ifndef OPENSSL_NO_KRB5
2146         KSSL_ERR kssl_err;
2147 #endif /* OPENSSL_NO_KRB5 */
2148
2149 #ifndef OPENSSL_NO_ECDH
2150         EC_KEY *srvr_ecdh = NULL;
2151         EVP_PKEY *clnt_pub_pkey = NULL;
2152         EC_POINT *clnt_ecpoint = NULL;
2153         BN_CTX *bn_ctx = NULL; 
2154 #endif
2155
2156         n=s->method->ssl_get_message(s,
2157                 SSL3_ST_SR_KEY_EXCH_A,
2158                 SSL3_ST_SR_KEY_EXCH_B,
2159                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2160                 2048, /* ??? */
2161                 &ok);
2162
2163         if (!ok) return((int)n);
2164         p=(unsigned char *)s->init_msg;
2165
2166         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2167
2168 #ifndef OPENSSL_NO_RSA
2169         if (alg_k & SSL_kRSA)
2170                 {
2171                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2172                 int decrypt_len;
2173                 unsigned char decrypt_good, version_good;
2174
2175                 /* FIX THIS UP EAY EAY EAY EAY */
2176                 if (s->s3->tmp.use_rsa_tmp)
2177                         {
2178                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2179                                 rsa=s->cert->rsa_tmp;
2180                         /* Don't do a callback because rsa_tmp should
2181                          * be sent already */
2182                         if (rsa == NULL)
2183                                 {
2184                                 al=SSL_AD_HANDSHAKE_FAILURE;
2185                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2186                                 goto f_err;
2187
2188                                 }
2189                         }
2190                 else
2191                         {
2192                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2193                         if (    (pkey == NULL) ||
2194                                 (pkey->type != EVP_PKEY_RSA) ||
2195                                 (pkey->pkey.rsa == NULL))
2196                                 {
2197                                 al=SSL_AD_HANDSHAKE_FAILURE;
2198                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2199                                 goto f_err;
2200                                 }
2201                         rsa=pkey->pkey.rsa;
2202                         }
2203
2204                 /* TLS and [incidentally] DTLS{0xFEFF} */
2205                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2206                         {
2207                         n2s(p,i);
2208                         if (n != i+2)
2209                                 {
2210                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2211                                         {
2212                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2213                                         goto err;
2214                                         }
2215                                 else
2216                                         p-=2;
2217                                 }
2218                         else
2219                                 n=i;
2220                         }
2221
2222                 /* We must not leak whether a decryption failure occurs because
2223                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2224                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2225                  * the TLS RFC and generates a random premaster secret for the
2226                  * case that the decrypt fails. See
2227                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2228
2229                 /* should be RAND_bytes, but we cannot work around a failure. */
2230                 if (RAND_pseudo_bytes(rand_premaster_secret,
2231                                       sizeof(rand_premaster_secret)) <= 0)
2232                         goto err;
2233                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2234                 ERR_clear_error();
2235
2236                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2237                  * decrypt_good will be 0xff if so and zero otherwise. */
2238                 decrypt_good = constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2239
2240                 /* If the version in the decrypted pre-master secret is correct
2241                  * then version_good will be 0xff, otherwise it'll be zero.
2242                  * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2243                  * (http://eprint.iacr.org/2003/052/) exploits the version
2244                  * number check as a "bad version oracle". Thus version checks
2245                  * are done in constant time and are treated like any other
2246                  * decryption error. */
2247                 version_good = constant_time_eq_8(p[0], (unsigned)(s->client_version>>8));
2248                 version_good &= constant_time_eq_8(p[1], (unsigned)(s->client_version&0xff));
2249
2250                 /* The premaster secret must contain the same version number as
2251                  * the ClientHello to detect version rollback attacks
2252                  * (strangely, the protocol does not offer such protection for
2253                  * DH ciphersuites). However, buggy clients exist that send the
2254                  * negotiated protocol version instead if the server does not
2255                  * support the requested protocol version. If
2256                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2257                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2258                         {
2259                         unsigned char workaround_good;
2260                         workaround_good = constant_time_eq_8(p[0], (unsigned)(s->version>>8));
2261                         workaround_good &= constant_time_eq_8(p[1], (unsigned)(s->version&0xff));
2262                         version_good |= workaround_good;
2263                         }
2264
2265                 /* Both decryption and version must be good for decrypt_good
2266                  * to remain non-zero (0xff). */
2267                 decrypt_good &= version_good;
2268
2269                 /* Now copy rand_premaster_secret over p using
2270                  * decrypt_good_mask. */
2271                 for (i = 0; i < (int) sizeof(rand_premaster_secret); i++)
2272                         {
2273                         p[i] = constant_time_select_8(decrypt_good, p[i],
2274                                                       rand_premaster_secret[i]);
2275                         }
2276
2277                 s->session->master_key_length=
2278                         s->method->ssl3_enc->generate_master_secret(s,
2279                                 s->session->master_key,
2280                                 p,i);
2281                 OPENSSL_cleanse(p,i);
2282                 }
2283         else
2284 #endif
2285 #ifndef OPENSSL_NO_DH
2286                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2287                 {
2288                 n2s(p,i);
2289                 if (n != i+2)
2290                         {
2291                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2292                                 {
2293                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2294                                 goto err;
2295                                 }
2296                         else
2297                                 {
2298                                 p-=2;
2299                                 i=(int)n;
2300                                 }
2301                         }
2302
2303                 if (n == 0L) /* the parameters are in the cert */
2304                         {
2305                         al=SSL_AD_HANDSHAKE_FAILURE;
2306                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2307                         goto f_err;
2308                         }
2309                 else
2310                         {
2311                         if (s->s3->tmp.dh == NULL)
2312                                 {
2313                                 al=SSL_AD_HANDSHAKE_FAILURE;
2314                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2315                                 goto f_err;
2316                                 }
2317                         else
2318                                 dh_srvr=s->s3->tmp.dh;
2319                         }
2320
2321                 pub=BN_bin2bn(p,i,NULL);
2322                 if (pub == NULL)
2323                         {
2324                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2325                         goto err;
2326                         }
2327
2328                 i=DH_compute_key(p,pub,dh_srvr);
2329
2330                 if (i <= 0)
2331                         {
2332                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2333                         BN_clear_free(pub);
2334                         goto err;
2335                         }
2336
2337                 DH_free(s->s3->tmp.dh);
2338                 s->s3->tmp.dh=NULL;
2339
2340                 BN_clear_free(pub);
2341                 pub=NULL;
2342                 s->session->master_key_length=
2343                         s->method->ssl3_enc->generate_master_secret(s,
2344                                 s->session->master_key,p,i);
2345                 OPENSSL_cleanse(p,i);
2346                 }
2347         else
2348 #endif
2349 #ifndef OPENSSL_NO_KRB5
2350         if (alg_k & SSL_kKRB5)
2351                 {
2352                 krb5_error_code         krb5rc;
2353                 krb5_data               enc_ticket;
2354                 krb5_data               authenticator;
2355                 krb5_data               enc_pms;
2356                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2357                 EVP_CIPHER_CTX          ciph_ctx;
2358                 const EVP_CIPHER        *enc = NULL;
2359                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2360                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2361                                                + EVP_MAX_BLOCK_LENGTH];
2362                 int                  padl, outl;
2363                 krb5_timestamp          authtime = 0;
2364                 krb5_ticket_times       ttimes;
2365
2366                 EVP_CIPHER_CTX_init(&ciph_ctx);
2367
2368                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2369
2370                 n2s(p,i);
2371                 enc_ticket.length = i;
2372
2373                 if (n < (long)(enc_ticket.length + 6))
2374                         {
2375                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2376                                 SSL_R_DATA_LENGTH_TOO_LONG);
2377                         goto err;
2378                         }
2379
2380                 enc_ticket.data = (char *)p;
2381                 p+=enc_ticket.length;
2382
2383                 n2s(p,i);
2384                 authenticator.length = i;
2385
2386                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2387                         {
2388                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2389                                 SSL_R_DATA_LENGTH_TOO_LONG);
2390                         goto err;
2391                         }
2392
2393                 authenticator.data = (char *)p;
2394                 p+=authenticator.length;
2395
2396                 n2s(p,i);
2397                 enc_pms.length = i;
2398                 enc_pms.data = (char *)p;
2399                 p+=enc_pms.length;
2400
2401                 /* Note that the length is checked again below,
2402                 ** after decryption
2403                 */
2404                 if(enc_pms.length > sizeof pms)
2405                         {
2406                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2407                                SSL_R_DATA_LENGTH_TOO_LONG);
2408                         goto err;
2409                         }
2410
2411                 if (n != (long)(enc_ticket.length + authenticator.length +
2412                                                 enc_pms.length + 6))
2413                         {
2414                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2415                                 SSL_R_DATA_LENGTH_TOO_LONG);
2416                         goto err;
2417                         }
2418
2419                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2420                                         &kssl_err)) != 0)
2421                         {
2422 #ifdef KSSL_DEBUG
2423                         printf("kssl_sget_tkt rtn %d [%d]\n",
2424                                 krb5rc, kssl_err.reason);
2425                         if (kssl_err.text)
2426                                 printf("kssl_err text= %s\n", kssl_err.text);
2427 #endif  /* KSSL_DEBUG */
2428                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2429                                 kssl_err.reason);
2430                         goto err;
2431                         }
2432
2433                 /*  Note: no authenticator is not considered an error,
2434                 **  but will return authtime == 0.
2435                 */
2436                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2437                                         &authtime, &kssl_err)) != 0)
2438                         {
2439 #ifdef KSSL_DEBUG
2440                         printf("kssl_check_authent rtn %d [%d]\n",
2441                                 krb5rc, kssl_err.reason);
2442                         if (kssl_err.text)
2443                                 printf("kssl_err text= %s\n", kssl_err.text);
2444 #endif  /* KSSL_DEBUG */
2445                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2446                                 kssl_err.reason);
2447                         goto err;
2448                         }
2449
2450                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2451                         {
2452                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2453                         goto err;
2454                         }
2455
2456 #ifdef KSSL_DEBUG
2457                 kssl_ctx_show(kssl_ctx);
2458 #endif  /* KSSL_DEBUG */
2459
2460                 enc = kssl_map_enc(kssl_ctx->enctype);
2461                 if (enc == NULL)
2462                     goto err;
2463
2464                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2465
2466                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2467                         {
2468                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2469                                 SSL_R_DECRYPTION_FAILED);
2470                         goto err;
2471                         }
2472                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2473                                         (unsigned char *)enc_pms.data, enc_pms.length))
2474                         {
2475                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2476                                 SSL_R_DECRYPTION_FAILED);
2477                         goto err;
2478                         }
2479                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2480                         {
2481                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2482                                 SSL_R_DATA_LENGTH_TOO_LONG);
2483                         goto err;
2484                         }
2485                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2486                         {
2487                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2488                                 SSL_R_DECRYPTION_FAILED);
2489                         goto err;
2490                         }
2491                 outl += padl;
2492                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2493                         {
2494                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2495                                 SSL_R_DATA_LENGTH_TOO_LONG);
2496                         goto err;
2497                         }
2498                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2499                     {
2500                     /* The premaster secret must contain the same version number as the
2501                      * ClientHello to detect version rollback attacks (strangely, the
2502                      * protocol does not offer such protection for DH ciphersuites).
2503                      * However, buggy clients exist that send random bytes instead of
2504                      * the protocol version.
2505                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2506                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2507                      */
2508                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2509                         {
2510                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2511                                SSL_AD_DECODE_ERROR);
2512                         goto err;
2513                         }
2514                     }
2515
2516                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2517
2518                 s->session->master_key_length=
2519                         s->method->ssl3_enc->generate_master_secret(s,
2520                                 s->session->master_key, pms, outl);
2521
2522                 if (kssl_ctx->client_princ)
2523                         {
2524                         size_t len = strlen(kssl_ctx->client_princ);
2525                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2526                                 {
2527                                 s->session->krb5_client_princ_len = len;
2528                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2529                                 }
2530                         }
2531
2532
2533                 /*  Was doing kssl_ctx_free() here,
2534                 **  but it caused problems for apache.
2535                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2536                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2537                 */
2538                 }
2539         else
2540 #endif  /* OPENSSL_NO_KRB5 */
2541
2542 #ifndef OPENSSL_NO_ECDH
2543                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2544                 {
2545                 int ret = 1;
2546                 int field_size = 0;
2547                 const EC_KEY   *tkey;
2548                 const EC_GROUP *group;
2549                 const BIGNUM *priv_key;
2550
2551                 /* initialize structures for server's ECDH key pair */
2552                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2553                         {
2554                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2555                             ERR_R_MALLOC_FAILURE);
2556                         goto err;
2557                         }
2558
2559                 /* Let's get server private key and group information */
2560                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2561                         { 
2562                         /* use the certificate */
2563                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2564                         }
2565                 else
2566                         {
2567                         /* use the ephermeral values we saved when
2568                          * generating the ServerKeyExchange msg.
2569                          */
2570                         tkey = s->s3->tmp.ecdh;
2571                         }
2572
2573                 group    = EC_KEY_get0_group(tkey);
2574                 priv_key = EC_KEY_get0_private_key(tkey);
2575
2576                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2577                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2578                         {
2579                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2580                                ERR_R_EC_LIB);
2581                         goto err;
2582                         }
2583
2584                 /* Let's get client's public key */
2585                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2586                         {
2587                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2588                             ERR_R_MALLOC_FAILURE);
2589                         goto err;
2590                         }
2591
2592                 if (n == 0L) 
2593                         {
2594                         /* Client Publickey was in Client Certificate */
2595
2596                          if (alg_k & SSL_kEECDH)
2597                                  {
2598                                  al=SSL_AD_HANDSHAKE_FAILURE;
2599                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2600                                  goto f_err;
2601                                  }
2602                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2603                             == NULL) || 
2604                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2605                                 {
2606                                 /* XXX: For now, we do not support client
2607                                  * authentication using ECDH certificates
2608                                  * so this branch (n == 0L) of the code is
2609                                  * never executed. When that support is
2610                                  * added, we ought to ensure the key 
2611                                  * received in the certificate is 
2612                                  * authorized for key agreement.
2613                                  * ECDH_compute_key implicitly checks that
2614                                  * the two ECDH shares are for the same
2615                                  * group.
2616                                  */
2617                                 al=SSL_AD_HANDSHAKE_FAILURE;
2618                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2619                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2620                                 goto f_err;
2621                                 }
2622
2623                         if (EC_POINT_copy(clnt_ecpoint,
2624                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2625                                 {
2626                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2627                                         ERR_R_EC_LIB);
2628                                 goto err;
2629                                 }
2630                         ret = 2; /* Skip certificate verify processing */
2631                         }
2632                 else
2633                         {
2634                         /* Get client's public key from encoded point
2635                          * in the ClientKeyExchange message.
2636                          */
2637                         if ((bn_ctx = BN_CTX_new()) == NULL)
2638                                 {
2639                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2640                                     ERR_R_MALLOC_FAILURE);
2641                                 goto err;
2642                                 }
2643
2644                         /* Get encoded point length */
2645                         i = *p; 
2646                         p += 1;
2647                         if (n != 1 + i)
2648                                 {
2649                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2650                                     ERR_R_EC_LIB);
2651                                 goto err;
2652                                 }
2653                         if (EC_POINT_oct2point(group, 
2654                             clnt_ecpoint, p, i, bn_ctx) == 0)
2655                                 {
2656                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2657                                     ERR_R_EC_LIB);
2658                                 goto err;
2659                                 }
2660                         /* p is pointing to somewhere in the buffer
2661                          * currently, so set it to the start 
2662                          */ 
2663                         p=(unsigned char *)s->init_buf->data;
2664                         }
2665
2666                 /* Compute the shared pre-master secret */
2667                 field_size = EC_GROUP_get_degree(group);
2668                 if (field_size <= 0)
2669                         {
2670                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2671                                ERR_R_ECDH_LIB);
2672                         goto err;
2673                         }
2674                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2675                 if (i <= 0)
2676                         {
2677                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2678                             ERR_R_ECDH_LIB);
2679                         goto err;
2680                         }
2681
2682                 EVP_PKEY_free(clnt_pub_pkey);
2683                 EC_POINT_free(clnt_ecpoint);
2684                 EC_KEY_free(srvr_ecdh);
2685                 BN_CTX_free(bn_ctx);
2686                 EC_KEY_free(s->s3->tmp.ecdh);
2687                 s->s3->tmp.ecdh = NULL; 
2688
2689                 /* Compute the master secret */
2690                 s->session->master_key_length = s->method->ssl3_enc-> \
2691                     generate_master_secret(s, s->session->master_key, p, i);
2692                 
2693                 OPENSSL_cleanse(p, i);
2694                 return (ret);
2695                 }
2696         else
2697 #endif
2698 #ifndef OPENSSL_NO_PSK
2699                 if (alg_k & SSL_kPSK)
2700                         {
2701                         unsigned char *t = NULL;
2702                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2703                         unsigned int pre_ms_len = 0, psk_len = 0;
2704                         int psk_err = 1;
2705                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2706
2707                         al=SSL_AD_HANDSHAKE_FAILURE;
2708
2709                         n2s(p,i);
2710                         if (n != i+2)
2711                                 {
2712                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2713                                         SSL_R_LENGTH_MISMATCH);
2714                                 goto psk_err;
2715                                 }
2716                         if (i > PSK_MAX_IDENTITY_LEN)
2717                                 {
2718                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2719                                         SSL_R_DATA_LENGTH_TOO_LONG);
2720                                 goto psk_err;
2721                                 }
2722                         if (s->psk_server_callback == NULL)
2723                                 {
2724                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2725                                        SSL_R_PSK_NO_SERVER_CB);
2726                                 goto psk_err;
2727                                 }
2728
2729                         /* Create guaranteed NULL-terminated identity
2730                          * string for the callback */
2731                         memcpy(tmp_id, p, i);
2732                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2733                         psk_len = s->psk_server_callback(s, tmp_id,
2734                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2735                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2736
2737                         if (psk_len > PSK_MAX_PSK_LEN)
2738                                 {
2739                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2740                                         ERR_R_INTERNAL_ERROR);
2741                                 goto psk_err;
2742                                 }
2743                         else if (psk_len == 0)
2744                                 {
2745                                 /* PSK related to the given identity not found */
2746                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2747                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2748                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2749                                 goto psk_err;
2750                                 }
2751
2752                         /* create PSK pre_master_secret */
2753                         pre_ms_len=2+psk_len+2+psk_len;
2754                         t = psk_or_pre_ms;
2755                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2756                         s2n(psk_len, t);
2757                         memset(t, 0, psk_len);
2758                         t+=psk_len;
2759                         s2n(psk_len, t);
2760
2761                         if (s->session->psk_identity != NULL)
2762                                 OPENSSL_free(s->session->psk_identity);
2763                         s->session->psk_identity = BUF_strdup((char *)p);
2764                         if (s->session->psk_identity == NULL)
2765                                 {
2766                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2767                                         ERR_R_MALLOC_FAILURE);
2768                                 goto psk_err;
2769                                 }
2770
2771                         if (s->session->psk_identity_hint != NULL)
2772                                 OPENSSL_free(s->session->psk_identity_hint);
2773                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2774                         if (s->ctx->psk_identity_hint != NULL &&
2775                                 s->session->psk_identity_hint == NULL)
2776                                 {
2777                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2778                                         ERR_R_MALLOC_FAILURE);
2779                                 goto psk_err;
2780                                 }
2781
2782                         s->session->master_key_length=
2783                                 s->method->ssl3_enc->generate_master_secret(s,
2784                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2785                         psk_err = 0;
2786                 psk_err:
2787                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2788                         if (psk_err != 0)
2789                                 goto f_err;
2790                         }
2791                 else
2792 #endif
2793 #ifndef OPENSSL_NO_SRP
2794                 if (alg_k & SSL_kSRP)
2795                         {
2796                         int param_len;
2797
2798                         n2s(p,i);
2799                         param_len=i+2;
2800                         if (param_len > n)
2801                                 {
2802                                 al=SSL_AD_DECODE_ERROR;
2803                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2804                                 goto f_err;
2805                                 }
2806                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2807                                 {
2808                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2809                                 goto err;
2810                                 }
2811                         if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2812                                 || BN_is_zero(s->srp_ctx.A))
2813                                 {
2814                                 al=SSL_AD_ILLEGAL_PARAMETER;
2815                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2816                                 goto f_err;
2817                                 }
2818                         if (s->session->srp_username != NULL)
2819                                 OPENSSL_free(s->session->srp_username);
2820                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2821                         if (s->session->srp_username == NULL)
2822                                 {
2823                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2824                                         ERR_R_MALLOC_FAILURE);
2825                                 goto err;
2826                                 }
2827
2828                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2829                                 {
2830                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2831                                 goto err;
2832                                 }
2833
2834                         p+=i;
2835                         }
2836                 else
2837 #endif  /* OPENSSL_NO_SRP */
2838                 if (alg_k & SSL_kGOST) 
2839                         {
2840                         int ret = 0;
2841                         EVP_PKEY_CTX *pkey_ctx;
2842                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2843                         unsigned char premaster_secret[32], *start;
2844                         size_t outlen=32, inlen;
2845                         unsigned long alg_a;
2846                         int Ttag, Tclass;
2847                         long Tlen;
2848
2849                         /* Get our certificate private key*/
2850                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2851                         if (alg_a & SSL_aGOST94)
2852                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2853                         else if (alg_a & SSL_aGOST01)
2854                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2855
2856                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2857                         EVP_PKEY_decrypt_init(pkey_ctx);
2858                         /* If client certificate is present and is of the same type, maybe
2859                          * use it for key exchange.  Don't mind errors from
2860                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2861                          * a client certificate for authorization only. */
2862                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2863                         if (client_pub_pkey)
2864                                 {
2865                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2866                                         ERR_clear_error();
2867                                 }
2868                         /* Decrypt session key */
2869                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED || 
2870                                 Ttag != V_ASN1_SEQUENCE ||
2871                                 Tclass != V_ASN1_UNIVERSAL) 
2872                                 {
2873                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2874                                 goto gerr;
2875                                 }
2876                         start = p;
2877                         inlen = Tlen;
2878                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2879
2880                                 {
2881                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2882                                 goto gerr;
2883                                 }
2884                         /* Generate master secret */
2885                         s->session->master_key_length=
2886                                 s->method->ssl3_enc->generate_master_secret(s,
2887                                         s->session->master_key,premaster_secret,32);
2888                         /* Check if pubkey from client certificate was used */
2889                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2890                                 ret = 2;
2891                         else
2892                                 ret = 1;
2893                 gerr:
2894                         EVP_PKEY_free(client_pub_pkey);
2895                         EVP_PKEY_CTX_free(pkey_ctx);
2896                         if (ret)
2897                                 return ret;
2898                         else
2899                                 goto err;
2900                         }
2901                 else
2902                 {
2903                 al=SSL_AD_HANDSHAKE_FAILURE;
2904                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2905                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2906                 goto f_err;
2907                 }
2908
2909         return(1);
2910 f_err:
2911         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2912 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2913 err:
2914 #endif
2915 #ifndef OPENSSL_NO_ECDH
2916         EVP_PKEY_free(clnt_pub_pkey);
2917         EC_POINT_free(clnt_ecpoint);
2918         if (srvr_ecdh != NULL) 
2919                 EC_KEY_free(srvr_ecdh);
2920         BN_CTX_free(bn_ctx);
2921 #endif
2922         return(-1);
2923         }
2924
2925 int ssl3_get_cert_verify(SSL *s)
2926         {
2927         EVP_PKEY *pkey=NULL;
2928         unsigned char *p;
2929         int al,ok,ret=0;
2930         long n;
2931         int type=0,i,j;
2932         X509 *peer;
2933         const EVP_MD *md = NULL;
2934         EVP_MD_CTX mctx;
2935         EVP_MD_CTX_init(&mctx);
2936
2937         n=s->method->ssl_get_message(s,
2938                 SSL3_ST_SR_CERT_VRFY_A,
2939                 SSL3_ST_SR_CERT_VRFY_B,
2940                 -1,
2941                 SSL3_RT_MAX_PLAIN_LENGTH,
2942                 &ok);
2943