Abort handshake if signature algorithm used not supported by peer.
[openssl.git] / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include "ssl_locl.h"
156 #include "kssl_lcl.h"
157 #include <openssl/buffer.h>
158 #include <openssl/rand.h>
159 #include <openssl/objects.h>
160 #include <openssl/evp.h>
161 #include <openssl/hmac.h>
162 #include <openssl/x509.h>
163 #ifndef OPENSSL_NO_DH
164 #include <openssl/dh.h>
165 #endif
166 #include <openssl/bn.h>
167 #ifndef OPENSSL_NO_KRB5
168 #include <openssl/krb5_asn.h>
169 #endif
170 #include <openssl/md5.h>
171
172 static const SSL_METHOD *ssl3_get_server_method(int ver);
173
174 static const SSL_METHOD *ssl3_get_server_method(int ver)
175         {
176         if (ver == SSL3_VERSION)
177                 return(SSLv3_server_method());
178         else
179                 return(NULL);
180         }
181
182 #ifndef OPENSSL_NO_SRP
183 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
184         {
185         int ret = SSL_ERROR_NONE;
186
187         *al = SSL_AD_UNRECOGNIZED_NAME;
188
189         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
190             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
191                 {
192                 if(s->srp_ctx.login == NULL)
193                         {
194                         /* RFC 5054 says SHOULD reject, 
195                            we do so if There is no srp login name */
196                         ret = SSL3_AL_FATAL;
197                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
198                         }
199                 else
200                         {
201                         ret = SSL_srp_server_param_with_username(s,al);
202                         }
203                 }
204         return ret;
205         }
206 #endif
207
208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
209                         ssl3_accept,
210                         ssl_undefined_function,
211                         ssl3_get_server_method)
212
213 int ssl3_accept(SSL *s)
214         {
215         BUF_MEM *buf;
216         unsigned long alg_k,Time=(unsigned long)time(NULL);
217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
218         int ret= -1;
219         int new_state,state,skip=0;
220
221         RAND_add(&Time,sizeof(Time),0);
222         ERR_clear_error();
223         clear_sys_error();
224
225         if (s->info_callback != NULL)
226                 cb=s->info_callback;
227         else if (s->ctx->info_callback != NULL)
228                 cb=s->ctx->info_callback;
229
230         /* init things to blank */
231         s->in_handshake++;
232         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
233
234         if (s->cert == NULL)
235                 {
236                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
237                 return(-1);
238                 }
239
240 #ifndef OPENSSL_NO_HEARTBEATS
241         /* If we're awaiting a HeartbeatResponse, pretend we
242          * already got and don't await it anymore, because
243          * Heartbeats don't make sense during handshakes anyway.
244          */
245         if (s->tlsext_hb_pending)
246                 {
247                 s->tlsext_hb_pending = 0;
248                 s->tlsext_hb_seq++;
249                 }
250 #endif
251
252         for (;;)
253                 {
254                 state=s->state;
255
256                 switch (s->state)
257                         {
258                 case SSL_ST_RENEGOTIATE:
259                         s->renegotiate=1;
260                         /* s->state=SSL_ST_ACCEPT; */
261
262                 case SSL_ST_BEFORE:
263                 case SSL_ST_ACCEPT:
264                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
265                 case SSL_ST_OK|SSL_ST_ACCEPT:
266
267                         s->server=1;
268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
269
270                         if ((s->version>>8) != 3)
271                                 {
272                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
273                                 return -1;
274                                 }
275                         s->type=SSL_ST_ACCEPT;
276
277                         if (s->init_buf == NULL)
278                                 {
279                                 if ((buf=BUF_MEM_new()) == NULL)
280                                         {
281                                         ret= -1;
282                                         goto end;
283                                         }
284                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
285                                         {
286                                         ret= -1;
287                                         goto end;
288                                         }
289                                 s->init_buf=buf;
290                                 }
291
292                         if (!ssl3_setup_buffers(s))
293                                 {
294                                 ret= -1;
295                                 goto end;
296                                 }
297
298                         s->init_num=0;
299                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
300                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
301
302                         if (s->state != SSL_ST_RENEGOTIATE)
303                                 {
304                                 /* Ok, we now need to push on a buffering BIO so that
305                                  * the output is sent in a way that TCP likes :-)
306                                  */
307                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
308                                 
309                                 ssl3_init_finished_mac(s);
310                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
311                                 s->ctx->stats.sess_accept++;
312                                 }
313                         else if (!s->s3->send_connection_binding &&
314                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
315                                 {
316                                 /* Server attempting to renegotiate with
317                                  * client that doesn't support secure
318                                  * renegotiation.
319                                  */
320                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
321                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
322                                 ret = -1;
323                                 goto end;
324                                 }
325                         else
326                                 {
327                                 /* s->state == SSL_ST_RENEGOTIATE,
328                                  * we will just send a HelloRequest */
329                                 s->ctx->stats.sess_accept_renegotiate++;
330                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
331                                 }
332                         break;
333
334                 case SSL3_ST_SW_HELLO_REQ_A:
335                 case SSL3_ST_SW_HELLO_REQ_B:
336
337                         s->shutdown=0;
338                         ret=ssl3_send_hello_request(s);
339                         if (ret <= 0) goto end;
340                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
341                         s->state=SSL3_ST_SW_FLUSH;
342                         s->init_num=0;
343
344                         ssl3_init_finished_mac(s);
345                         break;
346
347                 case SSL3_ST_SW_HELLO_REQ_C:
348                         s->state=SSL_ST_OK;
349                         break;
350
351                 case SSL3_ST_SR_CLNT_HELLO_A:
352                 case SSL3_ST_SR_CLNT_HELLO_B:
353                 case SSL3_ST_SR_CLNT_HELLO_C:
354
355                         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 #ifndef OPENSSL_NO_TLSEXT
407                                 s->state = SSL3_ST_SW_SUPPLEMENTAL_DATA_A;
408 #else
409                         s->state = SSL3_ST_SW_CERT_A;
410 #endif
411                         s->init_num = 0;
412                         break;
413
414 #ifndef OPENSSL_NO_TLSEXT
415                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_A:
416                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_B:
417                         /* We promised to send an audit proof in the hello. */
418                         if (s->s3->tlsext_authz_promised_to_client)
419                                 {
420                                 ret = tls1_send_server_supplemental_data(s);
421                                 if (ret <= 0) goto end;
422                                 }
423                         else
424                                 skip = 1;
425
426                         s->state = SSL3_ST_SW_CERT_A;
427                         s->init_num = 0;
428                         break;
429 #endif
430
431                 case SSL3_ST_SW_CERT_A:
432                 case SSL3_ST_SW_CERT_B:
433                         /* Check if it is anon DH or anon ECDH, */
434                         /* normal PSK or KRB5 or SRP */
435                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
436                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
437                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
438                                 {
439                                 ret=ssl3_send_server_certificate(s);
440                                 if (ret <= 0) goto end;
441 #ifndef OPENSSL_NO_TLSEXT
442                                 if (s->tlsext_status_expected)
443                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
444                                 else
445                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
446                                 }
447                         else
448                                 {
449                                 skip = 1;
450                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
451                                 }
452 #else
453                                 }
454                         else
455                                 skip=1;
456
457                         s->state=SSL3_ST_SW_KEY_EXCH_A;
458 #endif
459                         s->init_num=0;
460                         break;
461
462                 case SSL3_ST_SW_KEY_EXCH_A:
463                 case SSL3_ST_SW_KEY_EXCH_B:
464                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
465
466                         /* clear this, it may get reset by
467                          * send_server_key_exchange */
468                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
469 #ifndef OPENSSL_NO_KRB5
470                                 && !(alg_k & SSL_kKRB5)
471 #endif /* OPENSSL_NO_KRB5 */
472                                 )
473                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
474                                  * even when forbidden by protocol specs
475                                  * (handshake may fail as clients are not required to
476                                  * be able to handle this) */
477                                 s->s3->tmp.use_rsa_tmp=1;
478                         else
479                                 s->s3->tmp.use_rsa_tmp=0;
480
481
482                         /* only send if a DH key exchange, fortezza or
483                          * RSA but we have a sign only certificate
484                          *
485                          * PSK: may send PSK identity hints
486                          *
487                          * For ECC ciphersuites, we send a serverKeyExchange
488                          * message only if the cipher suite is either
489                          * ECDH-anon or ECDHE. In other cases, the
490                          * server certificate contains the server's
491                          * public key for key exchange.
492                          */
493                         if (s->s3->tmp.use_rsa_tmp
494                         /* PSK: send ServerKeyExchange if PSK identity
495                          * hint if provided */
496 #ifndef OPENSSL_NO_PSK
497                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
498 #endif
499 #ifndef OPENSSL_NO_SRP
500                             /* SRP: send ServerKeyExchange */
501                             || (alg_k & SSL_kSRP)
502 #endif
503                             || (alg_k & SSL_kEDH)
504                             || (alg_k & SSL_kEECDH)
505                             || ((alg_k & SSL_kRSA)
506                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
507                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
508                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
509                                         )
510                                     )
511                                 )
512                             )
513                                 {
514                                 ret=ssl3_send_server_key_exchange(s);
515                                 if (ret <= 0) goto end;
516                                 }
517                         else
518                                 skip=1;
519
520                         s->state=SSL3_ST_SW_CERT_REQ_A;
521                         s->init_num=0;
522                         break;
523
524                 case SSL3_ST_SW_CERT_REQ_A:
525                 case SSL3_ST_SW_CERT_REQ_B:
526                         if (/* don't request cert unless asked for it: */
527                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
528                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
529                                  * don't request cert during re-negotiation: */
530                                 ((s->session->peer != NULL) &&
531                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
532                                 /* never request cert in anonymous ciphersuites
533                                  * (see section "Certificate request" in SSL 3 drafts
534                                  * and in RFC 2246): */
535                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
536                                  /* ... except when the application insists on verification
537                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
538                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
539                                  /* never request cert in Kerberos ciphersuites */
540                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
541                                 /* With normal PSK Certificates and
542                                  * Certificate Requests are omitted */
543                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
544                                 {
545                                 /* no cert request */
546                                 skip=1;
547                                 s->s3->tmp.cert_request=0;
548                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
549                                 if (s->s3->handshake_buffer)
550                                         if (!ssl3_digest_cached_records(s))
551                                                 return -1;
552                                 }
553                         else
554                                 {
555                                 s->s3->tmp.cert_request=1;
556                                 ret=ssl3_send_certificate_request(s);
557                                 if (ret <= 0) goto end;
558 #ifndef NETSCAPE_HANG_BUG
559                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
560 #else
561                                 s->state=SSL3_ST_SW_FLUSH;
562                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
563 #endif
564                                 s->init_num=0;
565                                 }
566                         break;
567
568                 case SSL3_ST_SW_SRVR_DONE_A:
569                 case SSL3_ST_SW_SRVR_DONE_B:
570                         ret=ssl3_send_server_done(s);
571                         if (ret <= 0) goto end;
572                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
573                         s->state=SSL3_ST_SW_FLUSH;
574                         s->init_num=0;
575                         break;
576                 
577                 case SSL3_ST_SW_FLUSH:
578
579                         /* This code originally checked to see if
580                          * any data was pending using BIO_CTRL_INFO
581                          * and then flushed. This caused problems
582                          * as documented in PR#1939. The proposed
583                          * fix doesn't completely resolve this issue
584                          * as buggy implementations of BIO_CTRL_PENDING
585                          * still exist. So instead we just flush
586                          * unconditionally.
587                          */
588
589                         s->rwstate=SSL_WRITING;
590                         if (BIO_flush(s->wbio) <= 0)
591                                 {
592                                 ret= -1;
593                                 goto end;
594                                 }
595                         s->rwstate=SSL_NOTHING;
596
597                         s->state=s->s3->tmp.next_state;
598                         break;
599
600                 case SSL3_ST_SR_CERT_A:
601                 case SSL3_ST_SR_CERT_B:
602                         /* Check for second client hello (MS SGC) */
603                         ret = ssl3_check_client_hello(s);
604                         if (ret <= 0)
605                                 goto end;
606                         if (ret == 2)
607                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
608                         else {
609                                 if (s->s3->tmp.cert_request)
610                                         {
611                                         ret=ssl3_get_client_certificate(s);
612                                         if (ret <= 0) goto end;
613                                         }
614                                 s->init_num=0;
615                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
616                         }
617                         break;
618
619                 case SSL3_ST_SR_KEY_EXCH_A:
620                 case SSL3_ST_SR_KEY_EXCH_B:
621                         ret=ssl3_get_client_key_exchange(s);
622                         if (ret <= 0)
623                                 goto end;
624                         if (ret == 2)
625                                 {
626                                 /* For the ECDH ciphersuites when
627                                  * the client sends its ECDH pub key in
628                                  * a certificate, the CertificateVerify
629                                  * message is not sent.
630                                  * Also for GOST ciphersuites when
631                                  * the client uses its key from the certificate
632                                  * for key exchange.
633                                  */
634 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
635                                 s->state=SSL3_ST_SR_FINISHED_A;
636 #else
637                                 if (s->s3->next_proto_neg_seen)
638                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
639                                 else
640                                         s->state=SSL3_ST_SR_FINISHED_A;
641 #endif
642                                 s->init_num = 0;
643                                 }
644                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
645                                 {
646                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
647                                 s->init_num=0;
648                                 if (!s->session->peer)
649                                         break;
650                                 /* For TLS v1.2 freeze the handshake buffer
651                                  * at this point and digest cached records.
652                                  */
653                                 if (!s->s3->handshake_buffer)
654                                         {
655                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
656                                         return -1;
657                                         }
658                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
659                                 if (!ssl3_digest_cached_records(s))
660                                         return -1;
661                                 }
662                         else
663                                 {
664                                 int offset=0;
665                                 int dgst_num;
666
667                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
668                                 s->init_num=0;
669
670                                 /* We need to get hashes here so if there is
671                                  * a client cert, it can be verified
672                                  * FIXME - digest processing for CertificateVerify
673                                  * should be generalized. But it is next step
674                                  */
675                                 if (s->s3->handshake_buffer)
676                                         if (!ssl3_digest_cached_records(s))
677                                                 return -1;
678                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
679                                         if (s->s3->handshake_dgst[dgst_num]) 
680                                                 {
681                                                 int dgst_size;
682
683                                                 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]));
684                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
685                                                 if (dgst_size < 0)
686                                                         {
687                                                         ret = -1;
688                                                         goto end;
689                                                         }
690                                                 offset+=dgst_size;
691                                                 }               
692                                 }
693                         break;
694
695                 case SSL3_ST_SR_CERT_VRFY_A:
696                 case SSL3_ST_SR_CERT_VRFY_B:
697
698                         /* we should decide if we expected this one */
699                         ret=ssl3_get_cert_verify(s);
700                         if (ret <= 0) goto end;
701
702 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
703                         s->state=SSL3_ST_SR_FINISHED_A;
704 #else
705                         if (s->s3->next_proto_neg_seen)
706                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
707                         else
708                                 s->state=SSL3_ST_SR_FINISHED_A;
709 #endif
710                         s->init_num=0;
711                         break;
712
713 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
714                 case SSL3_ST_SR_NEXT_PROTO_A:
715                 case SSL3_ST_SR_NEXT_PROTO_B:
716                         ret=ssl3_get_next_proto(s);
717                         if (ret <= 0) goto end;
718                         s->init_num = 0;
719                         s->state=SSL3_ST_SR_FINISHED_A;
720                         break;
721 #endif
722
723                 case SSL3_ST_SR_FINISHED_A:
724                 case SSL3_ST_SR_FINISHED_B:
725                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
726                                 SSL3_ST_SR_FINISHED_B);
727                         if (ret <= 0) goto end;
728                         if (s->hit)
729                                 s->state=SSL_ST_OK;
730 #ifndef OPENSSL_NO_TLSEXT
731                         else if (s->tlsext_ticket_expected)
732                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
733 #endif
734                         else
735                                 s->state=SSL3_ST_SW_CHANGE_A;
736                         s->init_num=0;
737                         break;
738
739 #ifndef OPENSSL_NO_TLSEXT
740                 case SSL3_ST_SW_SESSION_TICKET_A:
741                 case SSL3_ST_SW_SESSION_TICKET_B:
742                         ret=ssl3_send_newsession_ticket(s);
743                         if (ret <= 0) goto end;
744                         s->state=SSL3_ST_SW_CHANGE_A;
745                         s->init_num=0;
746                         break;
747
748                 case SSL3_ST_SW_CERT_STATUS_A:
749                 case SSL3_ST_SW_CERT_STATUS_B:
750                         ret=ssl3_send_cert_status(s);
751                         if (ret <= 0) goto end;
752                         s->state=SSL3_ST_SW_KEY_EXCH_A;
753                         s->init_num=0;
754                         break;
755
756 #endif
757
758                 case SSL3_ST_SW_CHANGE_A:
759                 case SSL3_ST_SW_CHANGE_B:
760
761                         s->session->cipher=s->s3->tmp.new_cipher;
762                         if (!s->method->ssl3_enc->setup_key_block(s))
763                                 { ret= -1; goto end; }
764
765                         ret=ssl3_send_change_cipher_spec(s,
766                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
767
768                         if (ret <= 0) goto end;
769                         s->state=SSL3_ST_SW_FINISHED_A;
770                         s->init_num=0;
771
772                         if (!s->method->ssl3_enc->change_cipher_state(s,
773                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
774                                 {
775                                 ret= -1;
776                                 goto end;
777                                 }
778
779                         break;
780
781                 case SSL3_ST_SW_FINISHED_A:
782                 case SSL3_ST_SW_FINISHED_B:
783                         ret=ssl3_send_finished(s,
784                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
785                                 s->method->ssl3_enc->server_finished_label,
786                                 s->method->ssl3_enc->server_finished_label_len);
787                         if (ret <= 0) goto end;
788                         s->state=SSL3_ST_SW_FLUSH;
789                         if (s->hit)
790                                 {
791 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
792                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
793 #else
794                                 if (s->s3->next_proto_neg_seen)
795                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
796                                 else
797                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
798 #endif
799                                 }
800                         else
801                                 s->s3->tmp.next_state=SSL_ST_OK;
802                         s->init_num=0;
803                         break;
804
805                 case SSL_ST_OK:
806                         /* clean a few things up */
807                         ssl3_cleanup_key_block(s);
808
809                         BUF_MEM_free(s->init_buf);
810                         s->init_buf=NULL;
811
812                         /* remove buffering on output */
813                         ssl_free_wbio_buffer(s);
814
815                         s->init_num=0;
816
817                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
818                                 {
819                                 s->renegotiate=0;
820                                 s->new_session=0;
821                                 
822                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
823                                 
824                                 s->ctx->stats.sess_accept_good++;
825                                 /* s->server=1; */
826                                 s->handshake_func=ssl3_accept;
827
828                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
829                                 }
830                         
831                         ret = 1;
832                         goto end;
833                         /* break; */
834
835                 default:
836                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
837                         ret= -1;
838                         goto end;
839                         /* break; */
840                         }
841                 
842                 if (!s->s3->tmp.reuse_message && !skip)
843                         {
844                         if (s->debug)
845                                 {
846                                 if ((ret=BIO_flush(s->wbio)) <= 0)
847                                         goto end;
848                                 }
849
850
851                         if ((cb != NULL) && (s->state != state))
852                                 {
853                                 new_state=s->state;
854                                 s->state=state;
855                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
856                                 s->state=new_state;
857                                 }
858                         }
859                 skip=0;
860                 }
861 end:
862         /* BIO_flush(s->wbio); */
863
864         s->in_handshake--;
865         if (cb != NULL)
866                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
867         return(ret);
868         }
869
870 int ssl3_send_hello_request(SSL *s)
871         {
872         unsigned char *p;
873
874         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
875                 {
876                 p=(unsigned char *)s->init_buf->data;
877                 *(p++)=SSL3_MT_HELLO_REQUEST;
878                 *(p++)=0;
879                 *(p++)=0;
880                 *(p++)=0;
881
882                 s->state=SSL3_ST_SW_HELLO_REQ_B;
883                 /* number of bytes to write */
884                 s->init_num=4;
885                 s->init_off=0;
886                 }
887
888         /* SSL3_ST_SW_HELLO_REQ_B */
889         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
890         }
891
892 int ssl3_check_client_hello(SSL *s)
893         {
894         int ok;
895         long n;
896
897         /* this function is called when we really expect a Certificate message,
898          * so permit appropriate message length */
899         n=s->method->ssl_get_message(s,
900                 SSL3_ST_SR_CERT_A,
901                 SSL3_ST_SR_CERT_B,
902                 -1,
903                 s->max_cert_list,
904                 &ok);
905         if (!ok) return((int)n);
906         s->s3->tmp.reuse_message = 1;
907         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
908                 {
909                 /* We only allow the client to restart the handshake once per
910                  * negotiation. */
911                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
912                         {
913                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
914                         return -1;
915                         }
916                 /* Throw away what we have done so far in the current handshake,
917                  * which will now be aborted. (A full SSL_clear would be too much.) */
918 #ifndef OPENSSL_NO_DH
919                 if (s->s3->tmp.dh != NULL)
920                         {
921                         DH_free(s->s3->tmp.dh);
922                         s->s3->tmp.dh = NULL;
923                         }
924 #endif
925 #ifndef OPENSSL_NO_ECDH
926                 if (s->s3->tmp.ecdh != NULL)
927                         {
928                         EC_KEY_free(s->s3->tmp.ecdh);
929                         s->s3->tmp.ecdh = NULL;
930                         }
931 #endif
932                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
933                 return 2;
934                 }
935         return 1;
936 }
937
938 int ssl3_get_client_hello(SSL *s)
939         {
940         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
941         unsigned int cookie_len;
942         long n;
943         unsigned long id;
944         unsigned char *p,*d,*q;
945         SSL_CIPHER *c;
946 #ifndef OPENSSL_NO_COMP
947         SSL_COMP *comp=NULL;
948 #endif
949         STACK_OF(SSL_CIPHER) *ciphers=NULL;
950
951         /* We do this so that we will respond with our native type.
952          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
953          * This down switching should be handled by a different method.
954          * If we are SSLv3, we will respond with SSLv3, even if prompted with
955          * TLSv1.
956          */
957         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
958                 )
959                 {
960                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
961                 }
962         s->first_packet=1;
963         n=s->method->ssl_get_message(s,
964                 SSL3_ST_SR_CLNT_HELLO_B,
965                 SSL3_ST_SR_CLNT_HELLO_C,
966                 SSL3_MT_CLIENT_HELLO,
967                 SSL3_RT_MAX_PLAIN_LENGTH,
968                 &ok);
969
970         if (!ok) return((int)n);
971         s->first_packet=0;
972         d=p=(unsigned char *)s->init_msg;
973
974         /* use version from inside client hello, not from record header
975          * (may differ: see RFC 2246, Appendix E, second paragraph) */
976         s->client_version=(((int)p[0])<<8)|(int)p[1];
977         p+=2;
978
979         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
980             (s->version != DTLS1_VERSION && s->client_version < s->version))
981                 {
982                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
983                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
984                         {
985                         /* similar to ssl3_get_record, send alert using remote version number */
986                         s->version = s->client_version;
987                         }
988                 al = SSL_AD_PROTOCOL_VERSION;
989                 goto f_err;
990                 }
991
992         /* If we require cookies and this ClientHello doesn't
993          * contain one, just return since we do not want to
994          * allocate any memory yet. So check cookie length...
995          */
996         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
997                 {
998                 unsigned int session_length, cookie_length;
999                 
1000                 session_length = *(p + SSL3_RANDOM_SIZE);
1001                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
1002
1003                 if (cookie_length == 0)
1004                         return 1;
1005                 }
1006
1007         /* load the client random */
1008         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1009         p+=SSL3_RANDOM_SIZE;
1010
1011         /* get the session-id */
1012         j= *(p++);
1013
1014         s->hit=0;
1015         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1016          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1017          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1018          * than a change to default behavior so that applications relying on this for security
1019          * won't even compile against older library versions).
1020          *
1021          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1022          * renegotiation but not a new session (s->new_session remains unset): for servers,
1023          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1024          * setting will be ignored.
1025          */
1026         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1027                 {
1028                 if (!ssl_get_new_session(s,1))
1029                         goto err;
1030                 }
1031         else
1032                 {
1033                 i=ssl_get_prev_session(s, p, j, d + n);
1034                 if (i == 1)
1035                         { /* previous session */
1036                         s->hit=1;
1037                         }
1038                 else if (i == -1)
1039                         goto err;
1040                 else /* i == 0 */
1041                         {
1042                         if (!ssl_get_new_session(s,1))
1043                                 goto err;
1044                         }
1045                 }
1046
1047         p+=j;
1048
1049         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1050                 {
1051                 /* cookie stuff */
1052                 cookie_len = *(p++);
1053
1054                 /* 
1055                  * The ClientHello may contain a cookie even if the
1056                  * HelloVerify message has not been sent--make sure that it
1057                  * does not cause an overflow.
1058                  */
1059                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1060                         {
1061                         /* too much data */
1062                         al = SSL_AD_DECODE_ERROR;
1063                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1064                         goto f_err;
1065                         }
1066
1067                 /* verify the cookie if appropriate option is set. */
1068                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1069                         cookie_len > 0)
1070                         {
1071                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1072
1073                         if ( s->ctx->app_verify_cookie_cb != NULL)
1074                                 {
1075                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1076                                         cookie_len) == 0)
1077                                         {
1078                                         al=SSL_AD_HANDSHAKE_FAILURE;
1079                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1080                                                 SSL_R_COOKIE_MISMATCH);
1081                                         goto f_err;
1082                                         }
1083                                 /* else cookie verification succeeded */
1084                                 }
1085                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1086                                                   s->d1->cookie_len) != 0) /* default verification */
1087                                 {
1088                                         al=SSL_AD_HANDSHAKE_FAILURE;
1089                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1090                                                 SSL_R_COOKIE_MISMATCH);
1091                                         goto f_err;
1092                                 }
1093
1094                         ret = 2;
1095                         }
1096
1097                 p += cookie_len;
1098                 }
1099
1100         n2s(p,i);
1101         if ((i == 0) && (j != 0))
1102                 {
1103                 /* we need a cipher if we are not resuming a session */
1104                 al=SSL_AD_ILLEGAL_PARAMETER;
1105                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1106                 goto f_err;
1107                 }
1108         if ((p+i) >= (d+n))
1109                 {
1110                 /* not enough data */
1111                 al=SSL_AD_DECODE_ERROR;
1112                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1113                 goto f_err;
1114                 }
1115         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1116                 == NULL))
1117                 {
1118                 goto err;
1119                 }
1120         p+=i;
1121
1122         /* If it is a hit, check that the cipher is in the list */
1123         if ((s->hit) && (i > 0))
1124                 {
1125                 j=0;
1126                 id=s->session->cipher->id;
1127
1128 #ifdef CIPHER_DEBUG
1129                 printf("client sent %d ciphers\n",sk_num(ciphers));
1130 #endif
1131                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1132                         {
1133                         c=sk_SSL_CIPHER_value(ciphers,i);
1134 #ifdef CIPHER_DEBUG
1135                         printf("client [%2d of %2d]:%s\n",
1136                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1137 #endif
1138                         if (c->id == id)
1139                                 {
1140                                 j=1;
1141                                 break;
1142                                 }
1143                         }
1144 /* Disabled because it can be used in a ciphersuite downgrade
1145  * attack: CVE-2010-4180.
1146  */
1147 #if 0
1148                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1149                         {
1150                         /* Special case as client bug workaround: the previously used cipher may
1151                          * not be in the current list, the client instead might be trying to
1152                          * continue using a cipher that before wasn't chosen due to server
1153                          * preferences.  We'll have to reject the connection if the cipher is not
1154                          * enabled, though. */
1155                         c = sk_SSL_CIPHER_value(ciphers, 0);
1156                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1157                                 {
1158                                 s->session->cipher = c;
1159                                 j = 1;
1160                                 }
1161                         }
1162 #endif
1163                 if (j == 0)
1164                         {
1165                         /* we need to have the cipher in the cipher
1166                          * list if we are asked to reuse it */
1167                         al=SSL_AD_ILLEGAL_PARAMETER;
1168                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1169                         goto f_err;
1170                         }
1171                 }
1172
1173         /* compression */
1174         i= *(p++);
1175         if ((p+i) > (d+n))
1176                 {
1177                 /* not enough data */
1178                 al=SSL_AD_DECODE_ERROR;
1179                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1180                 goto f_err;
1181                 }
1182         q=p;
1183         for (j=0; j<i; j++)
1184                 {
1185                 if (p[j] == 0) break;
1186                 }
1187
1188         p+=i;
1189         if (j >= i)
1190                 {
1191                 /* no compress */
1192                 al=SSL_AD_DECODE_ERROR;
1193                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1194                 goto f_err;
1195                 }
1196
1197 #ifndef OPENSSL_NO_TLSEXT
1198         /* TLS extensions*/
1199         if (s->version >= SSL3_VERSION)
1200                 {
1201                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1202                         {
1203                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1204                         goto err;
1205                         }
1206                 }
1207
1208         /* Check if we want to use external pre-shared secret for this
1209          * handshake for not reused session only. We need to generate
1210          * server_random before calling tls_session_secret_cb in order to allow
1211          * SessionTicket processing to use it in key derivation. */
1212         {
1213                 unsigned long Time;
1214                 unsigned char *pos;
1215                 Time=(unsigned long)time(NULL);                 /* Time */
1216                 pos=s->s3->server_random;
1217                 l2n(Time,pos);
1218                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1219                         {
1220                         goto f_err;
1221                         }
1222         }
1223
1224         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1225                 {
1226                 SSL_CIPHER *pref_cipher=NULL;
1227
1228                 s->session->master_key_length=sizeof(s->session->master_key);
1229                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1230                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1231                         {
1232                         s->hit=1;
1233                         s->session->ciphers=ciphers;
1234                         s->session->verify_result=X509_V_OK;
1235
1236                         ciphers=NULL;
1237
1238                         /* check if some cipher was preferred by call back */
1239                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1240                         if (pref_cipher == NULL)
1241                                 {
1242                                 al=SSL_AD_HANDSHAKE_FAILURE;
1243                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1244                                 goto f_err;
1245                                 }
1246
1247                         s->session->cipher=pref_cipher;
1248
1249                         if (s->cipher_list)
1250                                 sk_SSL_CIPHER_free(s->cipher_list);
1251
1252                         if (s->cipher_list_by_id)
1253                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1254
1255                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1256                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1257                         }
1258                 }
1259 #endif
1260
1261         /* Worst case, we will use the NULL compression, but if we have other
1262          * options, we will now look for them.  We have i-1 compression
1263          * algorithms from the client, starting at q. */
1264         s->s3->tmp.new_compression=NULL;
1265 #ifndef OPENSSL_NO_COMP
1266         /* This only happens if we have a cache hit */
1267         if (s->session->compress_meth != 0)
1268                 {
1269                 int m, comp_id = s->session->compress_meth;
1270                 /* Perform sanity checks on resumed compression algorithm */
1271                 /* Can't disable compression */
1272                 if (s->options & SSL_OP_NO_COMPRESSION)
1273                         {
1274                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1275                         goto f_err;
1276                         }
1277                 /* Look for resumed compression method */
1278                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1279                         {
1280                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1281                         if (comp_id == comp->id)
1282                                 {
1283                                 s->s3->tmp.new_compression=comp;
1284                                 break;
1285                                 }
1286                         }
1287                 if (s->s3->tmp.new_compression == NULL)
1288                         {
1289                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1290                         goto f_err;
1291                         }
1292                 /* Look for resumed method in compression list */
1293                 for (m = 0; m < i; m++)
1294                         {
1295                         if (q[m] == comp_id)
1296                                 break;
1297                         }
1298                 if (m >= i)
1299                         {
1300                         al=SSL_AD_ILLEGAL_PARAMETER;
1301                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1302                         goto f_err;
1303                         }
1304                 }
1305         else if (s->hit)
1306                 comp = NULL;
1307         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1308                 { /* See if we have a match */
1309                 int m,nn,o,v,done=0;
1310
1311                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1312                 for (m=0; m<nn; m++)
1313                         {
1314                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1315                         v=comp->id;
1316                         for (o=0; o<i; o++)
1317                                 {
1318                                 if (v == q[o])
1319                                         {
1320                                         done=1;
1321                                         break;
1322                                         }
1323                                 }
1324                         if (done) break;
1325                         }
1326                 if (done)
1327                         s->s3->tmp.new_compression=comp;
1328                 else
1329                         comp=NULL;
1330                 }
1331 #else
1332         /* If compression is disabled we'd better not try to resume a session
1333          * using compression.
1334          */
1335         if (s->session->compress_meth != 0)
1336                 {
1337                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1338                 goto f_err;
1339                 }
1340 #endif
1341
1342         /* Given s->session->ciphers and SSL_get_ciphers, we must
1343          * pick a cipher */
1344
1345         if (!s->hit)
1346                 {
1347 #ifdef OPENSSL_NO_COMP
1348                 s->session->compress_meth=0;
1349 #else
1350                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1351 #endif
1352                 if (s->session->ciphers != NULL)
1353                         sk_SSL_CIPHER_free(s->session->ciphers);
1354                 s->session->ciphers=ciphers;
1355                 if (ciphers == NULL)
1356                         {
1357                         al=SSL_AD_ILLEGAL_PARAMETER;
1358                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1359                         goto f_err;
1360                         }
1361                 ciphers=NULL;
1362                 /* Let cert callback update server certificates if required */
1363                 if (s->cert->cert_cb
1364                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
1365                         {
1366                         al=SSL_AD_INTERNAL_ERROR;
1367                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1368                         goto f_err;
1369                         }
1370                 c=ssl3_choose_cipher(s,s->session->ciphers,
1371                                      SSL_get_ciphers(s));
1372
1373                 if (c == NULL)
1374                         {
1375                         al=SSL_AD_HANDSHAKE_FAILURE;
1376                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1377                         goto f_err;
1378                         }
1379                 s->s3->tmp.new_cipher=c;
1380                 }
1381         else
1382                 {
1383                 /* Session-id reuse */
1384 #ifdef REUSE_CIPHER_BUG
1385                 STACK_OF(SSL_CIPHER) *sk;
1386                 SSL_CIPHER *nc=NULL;
1387                 SSL_CIPHER *ec=NULL;
1388
1389                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1390                         {
1391                         sk=s->session->ciphers;
1392                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1393                                 {
1394                                 c=sk_SSL_CIPHER_value(sk,i);
1395                                 if (c->algorithm_enc & SSL_eNULL)
1396                                         nc=c;
1397                                 if (SSL_C_IS_EXPORT(c))
1398                                         ec=c;
1399                                 }
1400                         if (nc != NULL)
1401                                 s->s3->tmp.new_cipher=nc;
1402                         else if (ec != NULL)
1403                                 s->s3->tmp.new_cipher=ec;
1404                         else
1405                                 s->s3->tmp.new_cipher=s->session->cipher;
1406                         }
1407                 else
1408 #endif
1409                 s->s3->tmp.new_cipher=s->session->cipher;
1410                 }
1411
1412         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1413                 {
1414                 if (!ssl3_digest_cached_records(s))
1415                         goto f_err;
1416                 }
1417         
1418         /* we now have the following setup. 
1419          * client_random
1420          * cipher_list          - our prefered list of ciphers
1421          * ciphers              - the clients prefered list of ciphers
1422          * compression          - basically ignored right now
1423          * ssl version is set   - sslv3
1424          * s->session           - The ssl session has been setup.
1425          * s->hit               - session reuse flag
1426          * s->tmp.new_cipher    - the new cipher to use.
1427          */
1428
1429         /* Handles TLS extensions that we couldn't check earlier */
1430         if (s->version >= SSL3_VERSION)
1431                 {
1432                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1433                         {
1434                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1435                         goto err;
1436                         }
1437                 }
1438
1439         if (ret < 0) ret=1;
1440         if (0)
1441                 {
1442 f_err:
1443                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1444                 }
1445 err:
1446         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1447         return(ret);
1448         }
1449
1450 int ssl3_send_server_hello(SSL *s)
1451         {
1452         unsigned char *buf;
1453         unsigned char *p,*d;
1454         int i,sl;
1455         unsigned long l;
1456 #ifdef OPENSSL_NO_TLSEXT
1457         unsigned long Time;
1458 #endif
1459
1460         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1461                 {
1462                 buf=(unsigned char *)s->init_buf->data;
1463 #ifdef OPENSSL_NO_TLSEXT
1464                 p=s->s3->server_random;
1465                 /* Generate server_random if it was not needed previously */
1466                 Time=(unsigned long)time(NULL);                 /* Time */
1467                 l2n(Time,p);
1468                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1469                         return -1;
1470 #endif
1471                 /* Do the message type and length last */
1472                 d=p= &(buf[4]);
1473
1474                 *(p++)=s->version>>8;
1475                 *(p++)=s->version&0xff;
1476
1477                 /* Random stuff */
1478                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1479                 p+=SSL3_RANDOM_SIZE;
1480
1481                 /* There are several cases for the session ID to send
1482                  * back in the server hello:
1483                  * - For session reuse from the session cache,
1484                  *   we send back the old session ID.
1485                  * - If stateless session reuse (using a session ticket)
1486                  *   is successful, we send back the client's "session ID"
1487                  *   (which doesn't actually identify the session).
1488                  * - If it is a new session, we send back the new
1489                  *   session ID.
1490                  * - However, if we want the new session to be single-use,
1491                  *   we send back a 0-length session ID.
1492                  * s->hit is non-zero in either case of session reuse,
1493                  * so the following won't overwrite an ID that we're supposed
1494                  * to send back.
1495                  */
1496                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1497                         && !s->hit)
1498                         s->session->session_id_length=0;
1499
1500                 sl=s->session->session_id_length;
1501                 if (sl > (int)sizeof(s->session->session_id))
1502                         {
1503                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1504                         return -1;
1505                         }
1506                 *(p++)=sl;
1507                 memcpy(p,s->session->session_id,sl);
1508                 p+=sl;
1509
1510                 /* put the cipher */
1511                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1512                 p+=i;
1513
1514                 /* put the compression method */
1515 #ifdef OPENSSL_NO_COMP
1516                         *(p++)=0;
1517 #else
1518                 if (s->s3->tmp.new_compression == NULL)
1519                         *(p++)=0;
1520                 else
1521                         *(p++)=s->s3->tmp.new_compression->id;
1522 #endif
1523 #ifndef OPENSSL_NO_TLSEXT
1524                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1525                         {
1526                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1527                         return -1;
1528                         }
1529                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1530                         {
1531                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1532                         return -1;
1533                         }
1534 #endif
1535                 /* do the header */
1536                 l=(p-d);
1537                 d=buf;
1538                 *(d++)=SSL3_MT_SERVER_HELLO;
1539                 l2n3(l,d);
1540
1541                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1542                 /* number of bytes to write */
1543                 s->init_num=p-buf;
1544                 s->init_off=0;
1545                 }
1546
1547         /* SSL3_ST_SW_SRVR_HELLO_B */
1548         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1549         }
1550
1551 int ssl3_send_server_done(SSL *s)
1552         {
1553         unsigned char *p;
1554
1555         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1556                 {
1557                 p=(unsigned char *)s->init_buf->data;
1558
1559                 /* do the header */
1560                 *(p++)=SSL3_MT_SERVER_DONE;
1561                 *(p++)=0;
1562                 *(p++)=0;
1563                 *(p++)=0;
1564
1565                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1566                 /* number of bytes to write */
1567                 s->init_num=4;
1568                 s->init_off=0;
1569                 }
1570
1571         /* SSL3_ST_SW_SRVR_DONE_B */
1572         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1573         }
1574
1575 int ssl3_send_server_key_exchange(SSL *s)
1576         {
1577 #ifndef OPENSSL_NO_RSA
1578         unsigned char *q;
1579         int j,num;
1580         RSA *rsa;
1581         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1582         unsigned int u;
1583 #endif
1584 #ifndef OPENSSL_NO_DH
1585         DH *dh=NULL,*dhp;
1586 #endif
1587 #ifndef OPENSSL_NO_ECDH
1588         EC_KEY *ecdh=NULL, *ecdhp;
1589         unsigned char *encodedPoint = NULL;
1590         int encodedlen = 0;
1591         int curve_id = 0;
1592         BN_CTX *bn_ctx = NULL; 
1593 #endif
1594         EVP_PKEY *pkey;
1595         const EVP_MD *md = NULL;
1596         unsigned char *p,*d;
1597         int al,i;
1598         unsigned long type;
1599         int n;
1600         CERT *cert;
1601         BIGNUM *r[4];
1602         int nr[4],kn;
1603         BUF_MEM *buf;
1604         EVP_MD_CTX md_ctx;
1605
1606         EVP_MD_CTX_init(&md_ctx);
1607         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1608                 {
1609                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1610                 cert=s->cert;
1611
1612                 buf=s->init_buf;
1613
1614                 r[0]=r[1]=r[2]=r[3]=NULL;
1615                 n=0;
1616 #ifndef OPENSSL_NO_RSA
1617                 if (type & SSL_kRSA)
1618                         {
1619                         rsa=cert->rsa_tmp;
1620                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1621                                 {
1622                                 rsa=s->cert->rsa_tmp_cb(s,
1623                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1624                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1625                                 if(rsa == NULL)
1626                                 {
1627                                         al=SSL_AD_HANDSHAKE_FAILURE;
1628                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1629                                         goto f_err;
1630                                 }
1631                                 RSA_up_ref(rsa);
1632                                 cert->rsa_tmp=rsa;
1633                                 }
1634                         if (rsa == NULL)
1635                                 {
1636                                 al=SSL_AD_HANDSHAKE_FAILURE;
1637                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1638                                 goto f_err;
1639                                 }
1640                         r[0]=rsa->n;
1641                         r[1]=rsa->e;
1642                         s->s3->tmp.use_rsa_tmp=1;
1643                         }
1644                 else
1645 #endif
1646 #ifndef OPENSSL_NO_DH
1647                         if (type & SSL_kEDH)
1648                         {
1649                         dhp=cert->dh_tmp;
1650                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1651                                 dhp=s->cert->dh_tmp_cb(s,
1652                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1653                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1654                         if (dhp == NULL)
1655                                 {
1656                                 al=SSL_AD_HANDSHAKE_FAILURE;
1657                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1658                                 goto f_err;
1659                                 }
1660
1661                         if (s->s3->tmp.dh != NULL)
1662                                 {
1663                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1664                                 goto err;
1665                                 }
1666
1667                         if ((dh=DHparams_dup(dhp)) == NULL)
1668                                 {
1669                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1670                                 goto err;
1671                                 }
1672
1673                         s->s3->tmp.dh=dh;
1674                         if ((dhp->pub_key == NULL ||
1675                              dhp->priv_key == NULL ||
1676                              (s->options & SSL_OP_SINGLE_DH_USE)))
1677                                 {
1678                                 if(!DH_generate_key(dh))
1679                                     {
1680                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1681                                            ERR_R_DH_LIB);
1682                                     goto err;
1683                                     }
1684                                 }
1685                         else
1686                                 {
1687                                 dh->pub_key=BN_dup(dhp->pub_key);
1688                                 dh->priv_key=BN_dup(dhp->priv_key);
1689                                 if ((dh->pub_key == NULL) ||
1690                                         (dh->priv_key == NULL))
1691                                         {
1692                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1693                                         goto err;
1694                                         }
1695                                 }
1696                         r[0]=dh->p;
1697                         r[1]=dh->g;
1698                         r[2]=dh->pub_key;
1699                         }
1700                 else 
1701 #endif
1702 #ifndef OPENSSL_NO_ECDH
1703                         if (type & SSL_kEECDH)
1704                         {
1705                         const EC_GROUP *group;
1706
1707                         ecdhp=cert->ecdh_tmp;
1708                         if (s->cert->ecdh_tmp_auto)
1709                                 {
1710                                 /* Get NID of first shared curve */
1711                                 int nid = tls1_shared_curve(s, 0);
1712                                 if (nid != NID_undef)
1713                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1714                                 }
1715                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1716                                 {
1717                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1718                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1719                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1720                                 }
1721                         if (ecdhp == NULL)
1722                                 {
1723                                 al=SSL_AD_HANDSHAKE_FAILURE;
1724                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1725                                 goto f_err;
1726                                 }
1727
1728                         if (s->s3->tmp.ecdh != NULL)
1729                                 {
1730                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1731                                 goto err;
1732                                 }
1733
1734                         /* Duplicate the ECDH structure. */
1735                         if (ecdhp == NULL)
1736                                 {
1737                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1738                                 goto err;
1739                                 }
1740                         if (s->cert->ecdh_tmp_auto)
1741                                 ecdh = ecdhp;
1742                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1743                                 {
1744                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1745                                 goto err;
1746                                 }
1747
1748                         s->s3->tmp.ecdh=ecdh;
1749                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1750                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1751                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1752                                 {
1753                                 if(!EC_KEY_generate_key(ecdh))
1754                                     {
1755                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1756                                     goto err;
1757                                     }
1758                                 }
1759
1760                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1761                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1762                             (EC_KEY_get0_private_key(ecdh) == NULL))
1763                                 {
1764                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1765                                 goto err;
1766                                 }
1767
1768                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1769                             (EC_GROUP_get_degree(group) > 163)) 
1770                                 {
1771                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1772                                 goto err;
1773                                 }
1774
1775                         /* XXX: For now, we only support ephemeral ECDH
1776                          * keys over named (not generic) curves. For 
1777                          * supported named curves, curve_id is non-zero.
1778                          */
1779                         if ((curve_id = 
1780                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1781                             == 0)
1782                                 {
1783                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1784                                 goto err;
1785                                 }
1786
1787                         /* Encode the public key.
1788                          * First check the size of encoding and
1789                          * allocate memory accordingly.
1790                          */
1791                         encodedlen = EC_POINT_point2oct(group, 
1792                             EC_KEY_get0_public_key(ecdh),
1793                             POINT_CONVERSION_UNCOMPRESSED, 
1794                             NULL, 0, NULL);
1795
1796                         encodedPoint = (unsigned char *) 
1797                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1798                         bn_ctx = BN_CTX_new();
1799                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1800                                 {
1801                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1802                                 goto err;
1803                                 }
1804
1805
1806                         encodedlen = EC_POINT_point2oct(group, 
1807                             EC_KEY_get0_public_key(ecdh), 
1808                             POINT_CONVERSION_UNCOMPRESSED, 
1809                             encodedPoint, encodedlen, bn_ctx);
1810
1811                         if (encodedlen == 0) 
1812                                 {
1813                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1814                                 goto err;
1815                                 }
1816
1817                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1818
1819                         /* XXX: For now, we only support named (not 
1820                          * generic) curves in ECDH ephemeral key exchanges.
1821                          * In this situation, we need four additional bytes
1822                          * to encode the entire ServerECDHParams
1823                          * structure. 
1824                          */
1825                         n = 4 + encodedlen;
1826
1827                         /* We'll generate the serverKeyExchange message
1828                          * explicitly so we can set these to NULLs
1829                          */
1830                         r[0]=NULL;
1831                         r[1]=NULL;
1832                         r[2]=NULL;
1833                         r[3]=NULL;
1834                         }
1835                 else 
1836 #endif /* !OPENSSL_NO_ECDH */
1837 #ifndef OPENSSL_NO_PSK
1838                         if (type & SSL_kPSK)
1839                                 {
1840                                 /* reserve size for record length and PSK identity hint*/
1841                                 n+=2+strlen(s->ctx->psk_identity_hint);
1842                                 }
1843                         else
1844 #endif /* !OPENSSL_NO_PSK */
1845 #ifndef OPENSSL_NO_SRP
1846                 if (type & SSL_kSRP)
1847                         {
1848                         if ((s->srp_ctx.N == NULL) ||
1849                                 (s->srp_ctx.g == NULL) ||
1850                                 (s->srp_ctx.s == NULL) ||
1851                                 (s->srp_ctx.B == NULL))
1852                                 {
1853                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1854                                 goto err;
1855                                 }
1856                         r[0]=s->srp_ctx.N;
1857                         r[1]=s->srp_ctx.g;
1858                         r[2]=s->srp_ctx.s;
1859                         r[3]=s->srp_ctx.B;
1860                         }
1861                 else 
1862 #endif
1863                         {
1864                         al=SSL_AD_HANDSHAKE_FAILURE;
1865                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1866                         goto f_err;
1867                         }
1868                 for (i=0; r[i] != NULL && i<4; i++)
1869                         {
1870                         nr[i]=BN_num_bytes(r[i]);
1871 #ifndef OPENSSL_NO_SRP
1872                         if ((i == 2) && (type & SSL_kSRP))
1873                                 n+=1+nr[i];
1874                         else
1875 #endif
1876                         n+=2+nr[i];
1877                         }
1878
1879                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1880                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1881                         {
1882                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1883                                 == NULL)
1884                                 {
1885                                 al=SSL_AD_DECODE_ERROR;
1886                                 goto f_err;
1887                                 }
1888                         kn=EVP_PKEY_size(pkey);
1889                         }
1890                 else
1891                         {
1892                         pkey=NULL;
1893                         kn=0;
1894                         }
1895
1896                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1897                         {
1898                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1899                         goto err;
1900                         }
1901                 d=(unsigned char *)s->init_buf->data;
1902                 p= &(d[4]);
1903
1904                 for (i=0; r[i] != NULL && i<4; i++)
1905                         {
1906 #ifndef OPENSSL_NO_SRP
1907                         if ((i == 2) && (type & SSL_kSRP))
1908                                 {
1909                                 *p = nr[i];
1910                                 p++;
1911                                 }
1912                         else
1913 #endif
1914                         s2n(nr[i],p);
1915                         BN_bn2bin(r[i],p);
1916                         p+=nr[i];
1917                         }
1918
1919 #ifndef OPENSSL_NO_ECDH
1920                 if (type & SSL_kEECDH) 
1921                         {
1922                         /* XXX: For now, we only support named (not generic) curves.
1923                          * In this situation, the serverKeyExchange message has:
1924                          * [1 byte CurveType], [2 byte CurveName]
1925                          * [1 byte length of encoded point], followed by
1926                          * the actual encoded point itself
1927                          */
1928                         *p = NAMED_CURVE_TYPE;
1929                         p += 1;
1930                         *p = 0;
1931                         p += 1;
1932                         *p = curve_id;
1933                         p += 1;
1934                         *p = encodedlen;
1935                         p += 1;
1936                         memcpy((unsigned char*)p, 
1937                             (unsigned char *)encodedPoint, 
1938                             encodedlen);
1939                         OPENSSL_free(encodedPoint);
1940                         encodedPoint = NULL;
1941                         p += encodedlen;
1942                         }
1943 #endif
1944
1945 #ifndef OPENSSL_NO_PSK
1946                 if (type & SSL_kPSK)
1947                         {
1948                         /* copy PSK identity hint */
1949                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1950                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1951                         p+=strlen(s->ctx->psk_identity_hint);
1952                         }
1953 #endif
1954
1955                 /* not anonymous */
1956                 if (pkey != NULL)
1957                         {
1958                         /* n is the length of the params, they start at &(d[4])
1959                          * and p points to the space at the end. */
1960 #ifndef OPENSSL_NO_RSA
1961                         if (pkey->type == EVP_PKEY_RSA
1962                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1963                                 {
1964                                 q=md_buf;
1965                                 j=0;
1966                                 for (num=2; num > 0; num--)
1967                                         {
1968                                         EVP_MD_CTX_set_flags(&md_ctx,
1969                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1970                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1971                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1972                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1973                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1974                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1975                                         EVP_DigestFinal_ex(&md_ctx,q,
1976                                                 (unsigned int *)&i);
1977                                         q+=i;
1978                                         j+=i;
1979                                         }
1980                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1981                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1982                                         {
1983                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1984                                         goto err;
1985                                         }
1986                                 s2n(u,p);
1987                                 n+=u+2;
1988                                 }
1989                         else
1990 #endif
1991                         if (md)
1992                                 {
1993                                 /* For TLS1.2 and later send signature
1994                                  * algorithm */
1995                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1996                                         {
1997                                         if (!tls12_get_sigandhash(p, pkey, md))
1998                                                 {
1999                                                 /* Should never happen */
2000                                                 al=SSL_AD_INTERNAL_ERROR;
2001                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2002                                                 goto f_err;
2003                                                 }
2004                                         p+=2;
2005                                         }
2006 #ifdef SSL_DEBUG
2007                                 fprintf(stderr, "Using hash %s\n",
2008                                                         EVP_MD_name(md));
2009 #endif
2010                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2011                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2012                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2013                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
2014                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2015                                         (unsigned int *)&i,pkey))
2016                                         {
2017                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2018                                         goto err;
2019                                         }
2020                                 s2n(i,p);
2021                                 n+=i+2;
2022                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2023                                         n+= 2;
2024                                 }
2025                         else
2026                                 {
2027                                 /* Is this error check actually needed? */
2028                                 al=SSL_AD_HANDSHAKE_FAILURE;
2029                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2030                                 goto f_err;
2031                                 }
2032                         }
2033
2034                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2035                 l2n3(n,d);
2036
2037                 /* we should now have things packed up, so lets send
2038                  * it off */
2039                 s->init_num=n+4;
2040                 s->init_off=0;
2041                 }
2042
2043         s->state = SSL3_ST_SW_KEY_EXCH_B;
2044         EVP_MD_CTX_cleanup(&md_ctx);
2045         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2046 f_err:
2047         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2048 err:
2049 #ifndef OPENSSL_NO_ECDH
2050         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2051         BN_CTX_free(bn_ctx);
2052 #endif
2053         EVP_MD_CTX_cleanup(&md_ctx);
2054         return(-1);
2055         }
2056
2057 int ssl3_send_certificate_request(SSL *s)
2058         {
2059         unsigned char *p,*d;
2060         int i,j,nl,off,n;
2061         STACK_OF(X509_NAME) *sk=NULL;
2062         X509_NAME *name;
2063         BUF_MEM *buf;
2064
2065         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2066                 {
2067                 buf=s->init_buf;
2068
2069                 d=p=(unsigned char *)&(buf->data[4]);
2070
2071                 /* get the list of acceptable cert types */
2072                 p++;
2073                 n=ssl3_get_req_cert_type(s,p);
2074                 d[0]=n;
2075                 p+=n;
2076                 n++;
2077
2078                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2079                         {
2080                         const unsigned char *psigs;
2081                         nl = tls12_get_psigalgs(s, &psigs);
2082                         s2n(nl, p);
2083                         memcpy(p, psigs, nl);
2084                         p += nl;
2085                         n += nl + 2;
2086                         }
2087
2088                 off=n;
2089                 p+=2;
2090                 n+=2;
2091
2092                 sk=SSL_get_client_CA_list(s);
2093                 nl=0;
2094                 if (sk != NULL)
2095                         {
2096                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2097                                 {
2098                                 name=sk_X509_NAME_value(sk,i);
2099                                 j=i2d_X509_NAME(name,NULL);
2100                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2101                                         {
2102                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2103                                         goto err;
2104                                         }
2105                                 p=(unsigned char *)&(buf->data[4+n]);
2106                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2107                                         {
2108                                         s2n(j,p);
2109                                         i2d_X509_NAME(name,&p);
2110                                         n+=2+j;
2111                                         nl+=2+j;
2112                                         }
2113                                 else
2114                                         {
2115                                         d=p;
2116                                         i2d_X509_NAME(name,&p);
2117                                         j-=2; s2n(j,d); j+=2;
2118                                         n+=j;
2119                                         nl+=j;
2120                                         }
2121                                 }
2122                         }
2123                 /* else no CA names */
2124                 p=(unsigned char *)&(buf->data[4+off]);
2125                 s2n(nl,p);
2126
2127                 d=(unsigned char *)buf->data;
2128                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2129                 l2n3(n,d);
2130
2131                 /* we should now have things packed up, so lets send
2132                  * it off */
2133
2134                 s->init_num=n+4;
2135                 s->init_off=0;
2136 #ifdef NETSCAPE_HANG_BUG
2137                 p=(unsigned char *)s->init_buf->data + s->init_num;
2138
2139                 /* do the header */
2140                 *(p++)=SSL3_MT_SERVER_DONE;
2141                 *(p++)=0;
2142                 *(p++)=0;
2143                 *(p++)=0;
2144                 s->init_num += 4;
2145 #endif
2146
2147                 s->state = SSL3_ST_SW_CERT_REQ_B;
2148                 }
2149
2150         /* SSL3_ST_SW_CERT_REQ_B */
2151         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2152 err:
2153         return(-1);
2154         }
2155
2156 int ssl3_get_client_key_exchange(SSL *s)
2157         {
2158         int i,al,ok;
2159         long n;
2160         unsigned long alg_k;
2161         unsigned char *p;
2162 #ifndef OPENSSL_NO_RSA
2163         RSA *rsa=NULL;
2164         EVP_PKEY *pkey=NULL;
2165 #endif
2166 #ifndef OPENSSL_NO_DH
2167         BIGNUM *pub=NULL;
2168         DH *dh_srvr, *dh_clnt = NULL;
2169 #endif
2170 #ifndef OPENSSL_NO_KRB5
2171         KSSL_ERR kssl_err;
2172 #endif /* OPENSSL_NO_KRB5 */
2173
2174 #ifndef OPENSSL_NO_ECDH
2175         EC_KEY *srvr_ecdh = NULL;
2176         EVP_PKEY *clnt_pub_pkey = NULL;
2177         EC_POINT *clnt_ecpoint = NULL;
2178         BN_CTX *bn_ctx = NULL; 
2179 #endif
2180
2181         n=s->method->ssl_get_message(s,
2182                 SSL3_ST_SR_KEY_EXCH_A,
2183                 SSL3_ST_SR_KEY_EXCH_B,
2184                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2185                 2048, /* ??? */
2186                 &ok);
2187
2188         if (!ok) return((int)n);
2189         p=(unsigned char *)s->init_msg;
2190
2191         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2192
2193 #ifndef OPENSSL_NO_RSA
2194         if (alg_k & SSL_kRSA)
2195                 {
2196                 /* FIX THIS UP EAY EAY EAY EAY */
2197                 if (s->s3->tmp.use_rsa_tmp)
2198                         {
2199                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2200                                 rsa=s->cert->rsa_tmp;
2201                         /* Don't do a callback because rsa_tmp should
2202                          * be sent already */
2203                         if (rsa == NULL)
2204                                 {
2205                                 al=SSL_AD_HANDSHAKE_FAILURE;
2206                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2207                                 goto f_err;
2208
2209                                 }
2210                         }
2211                 else
2212                         {
2213                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2214                         if (    (pkey == NULL) ||
2215                                 (pkey->type != EVP_PKEY_RSA) ||
2216                                 (pkey->pkey.rsa == NULL))
2217                                 {
2218                                 al=SSL_AD_HANDSHAKE_FAILURE;
2219                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2220                                 goto f_err;
2221                                 }
2222                         rsa=pkey->pkey.rsa;
2223                         }
2224
2225                 /* TLS and [incidentally] DTLS{0xFEFF} */
2226                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2227                         {
2228                         n2s(p,i);
2229                         if (n != i+2)
2230                                 {
2231                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2232                                         {
2233                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2234                                         goto err;
2235                                         }
2236                                 else
2237                                         p-=2;
2238                                 }
2239                         else
2240                                 n=i;
2241                         }
2242
2243                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2244
2245                 al = -1;
2246                 
2247                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2248                         {
2249                         al=SSL_AD_DECODE_ERROR;
2250                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2251                         }
2252
2253                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2254                         {
2255                         /* The premaster secret must contain the same version number as the
2256                          * ClientHello to detect version rollback attacks (strangely, the
2257                          * protocol does not offer such protection for DH ciphersuites).
2258                          * However, buggy clients exist that send the negotiated protocol
2259                          * version instead if the server does not support the requested
2260                          * protocol version.
2261                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2262                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2263                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2264                                 {
2265                                 al=SSL_AD_DECODE_ERROR;
2266                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2267
2268                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2269                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2270                                  * number check as a "bad version oracle" -- an alert would
2271                                  * reveal that the plaintext corresponding to some ciphertext
2272                                  * made up by the adversary is properly formatted except
2273                                  * that the version number is wrong.  To avoid such attacks,
2274                                  * we should treat this just like any other decryption error. */
2275                                 }
2276                         }
2277
2278                 if (al != -1)
2279                         {
2280                         /* Some decryption failure -- use random value instead as countermeasure
2281                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2282                          * (see RFC 2246, section 7.4.7.1). */
2283                         ERR_clear_error();
2284                         i = SSL_MAX_MASTER_KEY_LENGTH;
2285                         p[0] = s->client_version >> 8;
2286                         p[1] = s->client_version & 0xff;
2287                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2288                                 goto err;
2289                         }
2290         
2291                 s->session->master_key_length=
2292                         s->method->ssl3_enc->generate_master_secret(s,
2293                                 s->session->master_key,
2294                                 p,i);
2295                 OPENSSL_cleanse(p,i);
2296                 }
2297         else
2298 #endif
2299 #ifndef OPENSSL_NO_DH
2300                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2301                 {
2302                 int idx = -1;
2303                 EVP_PKEY *skey = NULL;
2304                 if (n)
2305                         n2s(p,i);
2306                 else
2307                         i = 0;
2308                 if (n && n != i+2)
2309                         {
2310                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2311                                 {
2312                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2313                                 goto err;
2314                                 }
2315                         else
2316                                 {
2317                                 p-=2;
2318                                 i=(int)n;
2319                                 }
2320                         }
2321                 if (alg_k & SSL_kDHr)
2322                         idx = SSL_PKEY_DH_RSA;
2323                 else if (alg_k & SSL_kDHd)
2324                         idx = SSL_PKEY_DH_DSA;
2325                 if (idx >= 0)
2326                         {
2327                         skey = s->cert->pkeys[idx].privatekey;
2328                         if ((skey == NULL) ||
2329                                 (skey->type != EVP_PKEY_DH) ||
2330                                 (skey->pkey.dh == NULL))
2331                                 {
2332                                 al=SSL_AD_HANDSHAKE_FAILURE;
2333                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2334                                 goto f_err;
2335                                 }
2336                         dh_srvr = skey->pkey.dh;
2337                         }
2338                 else if (s->s3->tmp.dh == NULL)
2339                         {
2340                         al=SSL_AD_HANDSHAKE_FAILURE;
2341                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2342                         goto f_err;
2343                         }
2344                 else
2345                         dh_srvr=s->s3->tmp.dh;
2346
2347                 if (n == 0L)
2348                         {
2349                         /* Get pubkey from cert */
2350                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2351                         if (clkey)
2352                                 {
2353                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2354                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2355                                 }
2356                         if (dh_clnt == NULL)
2357                                 {
2358                                 al=SSL_AD_HANDSHAKE_FAILURE;
2359                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2360                                 goto f_err;
2361                                 }
2362                         EVP_PKEY_free(clkey);
2363                         pub = dh_clnt->pub_key;
2364                         }
2365                 else
2366                         pub=BN_bin2bn(p,i,NULL);
2367                 if (pub == NULL)
2368                         {
2369                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2370                         goto err;
2371                         }
2372
2373                 i=DH_compute_key(p,pub,dh_srvr);
2374
2375                 if (i <= 0)
2376                         {
2377                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2378                         BN_clear_free(pub);
2379                         goto err;
2380                         }
2381
2382                 DH_free(s->s3->tmp.dh);
2383                 s->s3->tmp.dh=NULL;
2384                 if (dh_clnt)
2385                         DH_free(dh_clnt);
2386                 else
2387                         BN_clear_free(pub);
2388                 pub=NULL;
2389                 s->session->master_key_length=
2390                         s->method->ssl3_enc->generate_master_secret(s,
2391                                 s->session->master_key,p,i);
2392                 OPENSSL_cleanse(p,i);
2393                 if (dh_clnt)
2394                         return 2;
2395                 }
2396         else
2397 #endif
2398 #ifndef OPENSSL_NO_KRB5
2399         if (alg_k & SSL_kKRB5)
2400                 {
2401                 krb5_error_code         krb5rc;
2402                 krb5_data               enc_ticket;
2403                 krb5_data               authenticator;
2404                 krb5_data               enc_pms;
2405                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2406                 EVP_CIPHER_CTX          ciph_ctx;
2407                 const EVP_CIPHER        *enc = NULL;
2408                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2409                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2410                                                + EVP_MAX_BLOCK_LENGTH];
2411                 int                  padl, outl;
2412                 krb5_timestamp          authtime = 0;
2413                 krb5_ticket_times       ttimes;
2414
2415                 EVP_CIPHER_CTX_init(&ciph_ctx);
2416
2417                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2418
2419                 n2s(p,i);
2420                 enc_ticket.length = i;
2421
2422                 if (n < (long)(enc_ticket.length + 6))
2423                         {
2424                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2425                                 SSL_R_DATA_LENGTH_TOO_LONG);
2426                         goto err;
2427                         }
2428
2429                 enc_ticket.data = (char *)p;
2430                 p+=enc_ticket.length;
2431
2432                 n2s(p,i);
2433                 authenticator.length = i;
2434
2435                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2436                         {
2437                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2438                                 SSL_R_DATA_LENGTH_TOO_LONG);
2439                         goto err;
2440                         }
2441
2442                 authenticator.data = (char *)p;
2443                 p+=authenticator.length;
2444
2445                 n2s(p,i);
2446                 enc_pms.length = i;
2447                 enc_pms.data = (char *)p;
2448                 p+=enc_pms.length;
2449
2450                 /* Note that the length is checked again below,
2451                 ** after decryption
2452                 */
2453                 if(enc_pms.length > sizeof pms)
2454                         {
2455                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2456                                SSL_R_DATA_LENGTH_TOO_LONG);
2457                         goto err;
2458                         }
2459
2460                 if (n != (long)(enc_ticket.length + authenticator.length +
2461                                                 enc_pms.length + 6))
2462                         {
2463                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2464                                 SSL_R_DATA_LENGTH_TOO_LONG);
2465                         goto err;
2466                         }
2467
2468                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2469                                         &kssl_err)) != 0)
2470                         {
2471 #ifdef KSSL_DEBUG
2472                         printf("kssl_sget_tkt rtn %d [%d]\n",
2473                                 krb5rc, kssl_err.reason);
2474                         if (kssl_err.text)
2475                                 printf("kssl_err text= %s\n", kssl_err.text);
2476 #endif  /* KSSL_DEBUG */
2477                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2478                                 kssl_err.reason);
2479                         goto err;
2480                         }
2481
2482                 /*  Note: no authenticator is not considered an error,
2483                 **  but will return authtime == 0.
2484                 */
2485                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2486                                         &authtime, &kssl_err)) != 0)
2487                         {
2488 #ifdef KSSL_DEBUG
2489                         printf("kssl_check_authent rtn %d [%d]\n",
2490                                 krb5rc, kssl_err.reason);
2491                         if (kssl_err.text)
2492                                 printf("kssl_err text= %s\n", kssl_err.text);
2493 #endif  /* KSSL_DEBUG */
2494                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2495                                 kssl_err.reason);
2496                         goto err;
2497                         }
2498
2499                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2500                         {
2501                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2502                         goto err;
2503                         }
2504
2505 #ifdef KSSL_DEBUG
2506                 kssl_ctx_show(kssl_ctx);
2507 #endif  /* KSSL_DEBUG */
2508
2509                 enc = kssl_map_enc(kssl_ctx->enctype);
2510                 if (enc == NULL)
2511                     goto err;
2512
2513                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2514
2515                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2516                         {
2517                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2518                                 SSL_R_DECRYPTION_FAILED);
2519                         goto err;
2520                         }
2521                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2522                                         (unsigned char *)enc_pms.data, enc_pms.length))
2523                         {
2524                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2525                                 SSL_R_DECRYPTION_FAILED);
2526                         goto err;
2527                         }
2528                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2529                         {
2530                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2531                                 SSL_R_DATA_LENGTH_TOO_LONG);
2532                         goto err;
2533                         }
2534                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2535                         {
2536                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2537                                 SSL_R_DECRYPTION_FAILED);
2538                         goto err;
2539                         }
2540                 outl += padl;
2541                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2542                         {
2543                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2544                                 SSL_R_DATA_LENGTH_TOO_LONG);
2545                         goto err;
2546                         }
2547                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2548                     {
2549                     /* The premaster secret must contain the same version number as the
2550                      * ClientHello to detect version rollback attacks (strangely, the
2551                      * protocol does not offer such protection for DH ciphersuites).
2552                      * However, buggy clients exist that send random bytes instead of
2553                      * the protocol version.
2554                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2555                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2556                      */
2557                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2558                         {
2559                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2560                                SSL_AD_DECODE_ERROR);
2561                         goto err;
2562                         }
2563                     }
2564
2565                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2566
2567                 s->session->master_key_length=
2568                         s->method->ssl3_enc->generate_master_secret(s,
2569                                 s->session->master_key, pms, outl);
2570
2571                 if (kssl_ctx->client_princ)
2572                         {
2573                         size_t len = strlen(kssl_ctx->client_princ);
2574                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2575                                 {
2576                                 s->session->krb5_client_princ_len = len;
2577                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2578                                 }
2579                         }
2580
2581
2582                 /*  Was doing kssl_ctx_free() here,
2583                 **  but it caused problems for apache.
2584                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2585                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2586                 */
2587                 }
2588         else
2589 #endif  /* OPENSSL_NO_KRB5 */
2590
2591 #ifndef OPENSSL_NO_ECDH
2592                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2593                 {
2594                 int ret = 1;
2595                 int field_size = 0;
2596                 const EC_KEY   *tkey;
2597                 const EC_GROUP *group;
2598                 const BIGNUM *priv_key;
2599
2600                 /* initialize structures for server's ECDH key pair */
2601                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2602                         {
2603                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2604                             ERR_R_MALLOC_FAILURE);
2605                         goto err;
2606                         }
2607
2608                 /* Let's get server private key and group information */
2609                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2610                         { 
2611                         /* use the certificate */
2612                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2613                         }
2614                 else
2615                         {
2616                         /* use the ephermeral values we saved when
2617                          * generating the ServerKeyExchange msg.
2618                          */
2619                         tkey = s->s3->tmp.ecdh;
2620                         }
2621
2622                 group    = EC_KEY_get0_group(tkey);
2623                 priv_key = EC_KEY_get0_private_key(tkey);
2624
2625                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2626                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2627                         {
2628                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2629                                ERR_R_EC_LIB);
2630                         goto err;
2631                         }
2632
2633                 /* Let's get client's public key */
2634                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2635                         {
2636                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2637                             ERR_R_MALLOC_FAILURE);
2638                         goto err;
2639                         }
2640
2641                 if (n == 0L) 
2642                         {
2643                         /* Client Publickey was in Client Certificate */
2644
2645                          if (alg_k & SSL_kEECDH)
2646                                  {
2647                                  al=SSL_AD_HANDSHAKE_FAILURE;
2648                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2649                                  goto f_err;
2650                                  }
2651                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2652                             == NULL) || 
2653                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2654                                 {
2655                                 /* XXX: For now, we do not support client
2656                                  * authentication using ECDH certificates
2657                                  * so this branch (n == 0L) of the code is
2658                                  * never executed. When that support is
2659                                  * added, we ought to ensure the key 
2660                                  * received in the certificate is 
2661                                  * authorized for key agreement.
2662                                  * ECDH_compute_key implicitly checks that
2663                                  * the two ECDH shares are for the same
2664                                  * group.
2665                                  */
2666                                 al=SSL_AD_HANDSHAKE_FAILURE;
2667                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2668                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2669                                 goto f_err;
2670                                 }
2671
2672                         if (EC_POINT_copy(clnt_ecpoint,
2673                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2674                                 {
2675                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2676                                         ERR_R_EC_LIB);
2677                                 goto err;
2678                                 }
2679                         ret = 2; /* Skip certificate verify processing */
2680                         }
2681                 else
2682                         {
2683                         /* Get client's public key from encoded point
2684                          * in the ClientKeyExchange message.
2685                          */
2686                         if ((bn_ctx = BN_CTX_new()) == NULL)
2687                                 {
2688                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2689                                     ERR_R_MALLOC_FAILURE);
2690                                 goto err;
2691                                 }
2692
2693                         /* Get encoded point length */
2694                         i = *p; 
2695                         p += 1;
2696                         if (n != 1 + i)
2697                                 {
2698                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2699                                     ERR_R_EC_LIB);
2700                                 goto err;
2701                                 }
2702                         if (EC_POINT_oct2point(group, 
2703                             clnt_ecpoint, p, i, bn_ctx) == 0)
2704                                 {
2705                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2706                                     ERR_R_EC_LIB);
2707                                 goto err;
2708                                 }
2709                         /* p is pointing to somewhere in the buffer
2710                          * currently, so set it to the start 
2711                          */ 
2712                         p=(unsigned char *)s->init_buf->data;
2713                         }
2714
2715                 /* Compute the shared pre-master secret */
2716                 field_size = EC_GROUP_get_degree(group);
2717                 if (field_size <= 0)
2718                         {
2719                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2720                                ERR_R_ECDH_LIB);
2721                         goto err;
2722                         }
2723                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2724                 if (i <= 0)
2725                         {
2726                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2727                             ERR_R_ECDH_LIB);
2728                         goto err;
2729                         }
2730
2731                 EVP_PKEY_free(clnt_pub_pkey);
2732                 EC_POINT_free(clnt_ecpoint);
2733                 EC_KEY_free(srvr_ecdh);
2734                 BN_CTX_free(bn_ctx);
2735                 EC_KEY_free(s->s3->tmp.ecdh);
2736                 s->s3->tmp.ecdh = NULL; 
2737
2738                 /* Compute the master secret */
2739                 s->session->master_key_length = s->method->ssl3_enc-> \
2740                     generate_master_secret(s, s->session->master_key, p, i);
2741                 
2742                 OPENSSL_cleanse(p, i);
2743                 return (ret);
2744                 }
2745         else
2746 #endif
2747 #ifndef OPENSSL_NO_PSK
2748                 if (alg_k & SSL_kPSK)
2749                         {
2750                         unsigned char *t = NULL;
2751                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2752                         unsigned int pre_ms_len = 0, psk_len = 0;
2753                         int psk_err = 1;
2754                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2755
2756                         al=SSL_AD_HANDSHAKE_FAILURE;
2757
2758                         n2s(p,i);
2759                         if (n != i+2)
2760                                 {
2761                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2762                                         SSL_R_LENGTH_MISMATCH);
2763                                 goto psk_err;
2764                                 }
2765                         if (i > PSK_MAX_IDENTITY_LEN)
2766                                 {
2767                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2768                                         SSL_R_DATA_LENGTH_TOO_LONG);
2769                                 goto psk_err;
2770                                 }
2771                         if (s->psk_server_callback == NULL)
2772                                 {
2773                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2774                                        SSL_R_PSK_NO_SERVER_CB);
2775                                 goto psk_err;
2776                                 }
2777
2778                         /* Create guaranteed NULL-terminated identity
2779                          * string for the callback */
2780                         memcpy(tmp_id, p, i);
2781                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2782                         psk_len = s->psk_server_callback(s, tmp_id,
2783                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2784                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2785
2786                         if (psk_len > PSK_MAX_PSK_LEN)
2787                                 {
2788                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2789                                         ERR_R_INTERNAL_ERROR);
2790                                 goto psk_err;
2791                                 }
2792                         else if (psk_len == 0)
2793                                 {
2794                                 /* PSK related to the given identity not found */
2795                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2796                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2797                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2798                                 goto psk_err;
2799                                 }
2800
2801                         /* create PSK pre_master_secret */
2802                         pre_ms_len=2+psk_len+2+psk_len;
2803                         t = psk_or_pre_ms;
2804                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2805                         s2n(psk_len, t);
2806                         memset(t, 0, psk_len);
2807                         t+=psk_len;
2808                         s2n(psk_len, t);
2809
2810                         if (s->session->psk_identity != NULL)
2811                                 OPENSSL_free(s->session->psk_identity);
2812                         s->session->psk_identity = BUF_strdup((char *)p);
2813                         if (s->session->psk_identity == NULL)
2814                                 {
2815                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2816                                         ERR_R_MALLOC_FAILURE);
2817                                 goto psk_err;
2818                                 }
2819
2820                         if (s->session->psk_identity_hint != NULL)
2821                                 OPENSSL_free(s->session->psk_identity_hint);
2822                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2823                         if (s->ctx->psk_identity_hint != NULL &&
2824                                 s->session->psk_identity_hint == NULL)
2825                                 {
2826                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2827                                         ERR_R_MALLOC_FAILURE);
2828                                 goto psk_err;
2829                                 }
2830
2831                         s->session->master_key_length=
2832                                 s->method->ssl3_enc->generate_master_secret(s,
2833                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2834                         psk_err = 0;
2835                 psk_err:
2836                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2837                         if (psk_err != 0)
2838                                 goto f_err;
2839                         }
2840                 else
2841 #endif
2842 #ifndef OPENSSL_NO_SRP
2843                 if (alg_k & SSL_kSRP)
2844                         {
2845                         int param_len;
2846
2847                         n2s(p,i);
2848                         param_len=i+2;
2849                         if (param_len > n)
2850                                 {
2851                                 al=SSL_AD_DECODE_ERROR;
2852                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2853                                 goto f_err;
2854                                 }
2855                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2856                                 {
2857                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2858                                 goto err;
2859                                 }
2860                         if (s->session->srp_username != NULL)
2861                                 OPENSSL_free(s->session->srp_username);
2862                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2863                         if (s->session->srp_username == NULL)
2864                                 {
2865                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2866                                         ERR_R_MALLOC_FAILURE);
2867                                 goto err;
2868                                 }
2869
2870                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2871                                 {
2872                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2873                                 goto err;
2874                                 }
2875
2876                         p+=i;
2877                         }
2878                 else
2879 #endif  /* OPENSSL_NO_SRP */
2880                 if (alg_k & SSL_kGOST) 
2881                         {
2882                         int ret = 0;
2883                         EVP_PKEY_CTX *pkey_ctx;
2884                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2885                         unsigned char premaster_secret[32], *start;
2886                         size_t outlen=32, inlen;
2887                         unsigned long alg_a;
2888
2889                         /* Get our certificate private key*/
2890                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2891                         if (alg_a & SSL_aGOST94)
2892                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2893                         else if (alg_a & SSL_aGOST01)
2894                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2895
2896                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2897                         EVP_PKEY_decrypt_init(pkey_ctx);
2898                         /* If client certificate is present and is of the same type, maybe
2899                          * use it for key exchange.  Don't mind errors from
2900                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2901                          * a client certificate for authorization only. */
2902                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2903                         if (client_pub_pkey)
2904                                 {
2905                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2906                                         ERR_clear_error();
2907                                 }
2908                         /* Decrypt session key */
2909                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2910                                 {
2911                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2912                                 goto gerr;
2913                                 }
2914                         if (p[1] == 0x81)
2915                                 {
2916                                 start = p+3;
2917                                 inlen = p[2];
2918                                 }
2919                         else if (p[1] < 0x80)
2920                                 {
2921                                 start = p+2;
2922                                 inlen = p[1];
2923                                 }
2924                         else
2925                                 {
2926                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2927                                 goto gerr;
2928                                 }
2929                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2930
2931          &nbs