PR: 1794
[openssl.git] / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include <openssl/crypto.h>
156 #include "ssl_locl.h"
157 #include "kssl_lcl.h"
158 #include <openssl/buffer.h>
159 #include <openssl/rand.h>
160 #include <openssl/objects.h>
161 #include <openssl/evp.h>
162 #include <openssl/hmac.h>
163 #include <openssl/x509.h>
164 #ifndef OPENSSL_NO_DH
165 #include <openssl/dh.h>
166 #endif
167 #include <openssl/bn.h>
168 #ifndef OPENSSL_NO_KRB5
169 #include <openssl/krb5_asn.h>
170 #endif
171 #include <openssl/md5.h>
172
173 static const SSL_METHOD *ssl3_get_server_method(int ver);
174
175 static const SSL_METHOD *ssl3_get_server_method(int ver)
176         {
177         if (ver == SSL3_VERSION)
178                 return(SSLv3_server_method());
179         else
180                 return(NULL);
181         }
182
183 #ifndef OPENSSL_NO_SRP
184 static int ssl_check_srp_ext_ClientHello(SSL *s,int *al)
185         {
186         int ret = SSL_ERROR_NONE;
187
188         *al = SSL_AD_UNRECOGNIZED_NAME;
189
190         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
191             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
192                 {
193                 if(s->srp_ctx.login == NULL)
194                         {
195                         /* RFC 5054 says SHOULD reject, 
196                            we do so if There is no srp login name */
197                         ret = SSL3_AL_FATAL;
198                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
199                         }
200                 else
201                         {
202                         ret = SSL_srp_server_param_with_username(s,al);
203                         }
204                 }
205         return ret;
206         }
207 #endif
208
209 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
210                         ssl3_accept,
211                         ssl_undefined_function,
212                         ssl3_get_server_method)
213
214 int ssl3_accept(SSL *s)
215         {
216         BUF_MEM *buf;
217         unsigned long alg_k,Time=(unsigned long)time(NULL);
218         void (*cb)(const SSL *ssl,int type,int val)=NULL;
219         int ret= -1;
220         int new_state,state,skip=0;
221
222         RAND_add(&Time,sizeof(Time),0);
223         ERR_clear_error();
224         clear_sys_error();
225
226         if (s->info_callback != NULL)
227                 cb=s->info_callback;
228         else if (s->ctx->info_callback != NULL)
229                 cb=s->ctx->info_callback;
230
231         /* init things to blank */
232         s->in_handshake++;
233         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
234
235         if (s->cert == NULL)
236                 {
237                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
238                 return(-1);
239                 }
240
241         for (;;)
242                 {
243                 state=s->state;
244
245                 switch (s->state)
246                         {
247                 case SSL_ST_RENEGOTIATE:
248                         s->renegotiate=1;
249                         /* s->state=SSL_ST_ACCEPT; */
250
251                 case SSL_ST_BEFORE:
252                 case SSL_ST_ACCEPT:
253                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
254                 case SSL_ST_OK|SSL_ST_ACCEPT:
255
256                         s->server=1;
257                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
258
259                         if ((s->version>>8) != 3)
260                                 {
261                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
262                                 return -1;
263                                 }
264                         s->type=SSL_ST_ACCEPT;
265
266                         if (s->init_buf == NULL)
267                                 {
268                                 if ((buf=BUF_MEM_new()) == NULL)
269                                         {
270                                         ret= -1;
271                                         goto end;
272                                         }
273                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
274                                         {
275                                         ret= -1;
276                                         goto end;
277                                         }
278                                 s->init_buf=buf;
279                                 }
280
281                         if (!ssl3_setup_buffers(s))
282                                 {
283                                 ret= -1;
284                                 goto end;
285                                 }
286
287                         s->init_num=0;
288
289                         if (s->state != SSL_ST_RENEGOTIATE)
290                                 {
291                                 /* Ok, we now need to push on a buffering BIO so that
292                                  * the output is sent in a way that TCP likes :-)
293                                  */
294                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
295                                 
296                                 ssl3_init_finished_mac(s);
297                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
298                                 s->ctx->stats.sess_accept++;
299                                 }
300                         else if (!s->s3->send_connection_binding &&
301                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
302                                 {
303                                 /* Server attempting to renegotiate with
304                                  * client that doesn't support secure
305                                  * renegotiation.
306                                  */
307                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
308                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
309                                 ret = -1;
310                                 goto end;
311                                 }
312                         else
313                                 {
314                                 /* s->state == SSL_ST_RENEGOTIATE,
315                                  * we will just send a HelloRequest */
316                                 s->ctx->stats.sess_accept_renegotiate++;
317                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
318                                 }
319                         break;
320
321                 case SSL3_ST_SW_HELLO_REQ_A:
322                 case SSL3_ST_SW_HELLO_REQ_B:
323
324                         s->shutdown=0;
325                         ret=ssl3_send_hello_request(s);
326                         if (ret <= 0) goto end;
327                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
328                         s->state=SSL3_ST_SW_FLUSH;
329                         s->init_num=0;
330
331                         ssl3_init_finished_mac(s);
332                         break;
333
334                 case SSL3_ST_SW_HELLO_REQ_C:
335                         s->state=SSL_ST_OK;
336                         break;
337
338                 case SSL3_ST_SR_CLNT_HELLO_A:
339                 case SSL3_ST_SR_CLNT_HELLO_B:
340                 case SSL3_ST_SR_CLNT_HELLO_C:
341
342                         s->shutdown=0;
343                         ret=ssl3_get_client_hello(s);
344                         if (ret <= 0) goto end;
345 #ifndef OPENSSL_NO_SRP
346                         {
347                         int al;
348
349                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al)) != SSL_ERROR_NONE)
350                                 {
351                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);                            
352                                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);                     
353                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;                       
354                                 ret= -1;
355                                 goto end;       
356                                 }
357                         }
358 #endif
359                         
360                         s->renegotiate = 2;
361                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
362                         s->init_num=0;
363                         break;
364
365                 case SSL3_ST_SW_SRVR_HELLO_A:
366                 case SSL3_ST_SW_SRVR_HELLO_B:
367                         ret=ssl3_send_server_hello(s);
368                         if (ret <= 0) goto end;
369 #ifndef OPENSSL_NO_TLSEXT
370                         if (s->hit)
371                                 {
372                                 if (s->tlsext_ticket_expected)
373                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
374                                 else
375                                         s->state=SSL3_ST_SW_CHANGE_A;
376                                 }
377 #else
378                         if (s->hit)
379                                         s->state=SSL3_ST_SW_CHANGE_A;
380 #endif
381                         else
382                                 s->state=SSL3_ST_SW_CERT_A;
383                         s->init_num=0;
384                         break;
385
386                 case SSL3_ST_SW_CERT_A:
387                 case SSL3_ST_SW_CERT_B:
388                         /* Check if it is anon DH or anon ECDH, */
389                         /* normal PSK or KRB5 or SRP */
390                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
391                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
392                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
393                                 {
394                                 ret=ssl3_send_server_certificate(s);
395                                 if (ret <= 0) goto end;
396 #ifndef OPENSSL_NO_TLSEXT
397                                 if (s->tlsext_status_expected)
398                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
399                                 else
400                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
401                                 }
402                         else
403                                 {
404                                 skip = 1;
405                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
406                                 }
407 #else
408                                 }
409                         else
410                                 skip=1;
411
412                         s->state=SSL3_ST_SW_KEY_EXCH_A;
413 #endif
414                         s->init_num=0;
415                         break;
416
417                 case SSL3_ST_SW_KEY_EXCH_A:
418                 case SSL3_ST_SW_KEY_EXCH_B:
419                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
420
421                         /* clear this, it may get reset by
422                          * send_server_key_exchange */
423                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
424 #ifndef OPENSSL_NO_KRB5
425                                 && !(alg_k & SSL_kKRB5)
426 #endif /* OPENSSL_NO_KRB5 */
427                                 )
428                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
429                                  * even when forbidden by protocol specs
430                                  * (handshake may fail as clients are not required to
431                                  * be able to handle this) */
432                                 s->s3->tmp.use_rsa_tmp=1;
433                         else
434                                 s->s3->tmp.use_rsa_tmp=0;
435
436
437                         /* only send if a DH key exchange, fortezza or
438                          * RSA but we have a sign only certificate
439                          *
440                          * PSK: may send PSK identity hints
441                          *
442                          * For ECC ciphersuites, we send a serverKeyExchange
443                          * message only if the cipher suite is either
444                          * ECDH-anon or ECDHE. In other cases, the
445                          * server certificate contains the server's
446                          * public key for key exchange.
447                          */
448                         if (s->s3->tmp.use_rsa_tmp
449                         /* PSK: send ServerKeyExchange if PSK identity
450                          * hint if provided */
451 #ifndef OPENSSL_NO_PSK
452                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
453 #endif
454 #ifndef OPENSSL_NO_SRP
455                             /* SRP: send ServerKeyExchange */
456                             || (alg_k & SSL_kSRP)
457 #endif
458                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
459                             || (alg_k & SSL_kEECDH)
460                             || ((alg_k & SSL_kRSA)
461                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
462                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
463                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
464                                         )
465                                     )
466                                 )
467                             )
468                                 {
469                                 ret=ssl3_send_server_key_exchange(s);
470                                 if (ret <= 0) goto end;
471                                 }
472                         else
473                                 skip=1;
474
475                         s->state=SSL3_ST_SW_CERT_REQ_A;
476                         s->init_num=0;
477                         break;
478
479                 case SSL3_ST_SW_CERT_REQ_A:
480                 case SSL3_ST_SW_CERT_REQ_B:
481                         if (/* don't request cert unless asked for it: */
482                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
483                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
484                                  * don't request cert during re-negotiation: */
485                                 ((s->session->peer != NULL) &&
486                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
487                                 /* never request cert in anonymous ciphersuites
488                                  * (see section "Certificate request" in SSL 3 drafts
489                                  * and in RFC 2246): */
490                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
491                                  /* ... except when the application insists on verification
492                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
493                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
494                                  /* never request cert in Kerberos ciphersuites */
495                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
496                                 /* With normal PSK Certificates and
497                                  * Certificate Requests are omitted */
498                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
499                                 {
500                                 /* no cert request */
501                                 skip=1;
502                                 s->s3->tmp.cert_request=0;
503                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
504                                 if (s->s3->handshake_buffer)
505                                         if (!ssl3_digest_cached_records(s))
506                                                 return -1;
507                                 }
508                         else
509                                 {
510                                 s->s3->tmp.cert_request=1;
511                                 ret=ssl3_send_certificate_request(s);
512                                 if (ret <= 0) goto end;
513 #ifndef NETSCAPE_HANG_BUG
514                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
515 #else
516                                 s->state=SSL3_ST_SW_FLUSH;
517                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
518 #endif
519                                 s->init_num=0;
520                                 }
521                         break;
522
523                 case SSL3_ST_SW_SRVR_DONE_A:
524                 case SSL3_ST_SW_SRVR_DONE_B:
525                         ret=ssl3_send_server_done(s);
526                         if (ret <= 0) goto end;
527                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
528                         s->state=SSL3_ST_SW_FLUSH;
529                         s->init_num=0;
530                         break;
531                 
532                 case SSL3_ST_SW_FLUSH:
533
534                         /* This code originally checked to see if
535                          * any data was pending using BIO_CTRL_INFO
536                          * and then flushed. This caused problems
537                          * as documented in PR#1939. The proposed
538                          * fix doesn't completely resolve this issue
539                          * as buggy implementations of BIO_CTRL_PENDING
540                          * still exist. So instead we just flush
541                          * unconditionally.
542                          */
543
544                         s->rwstate=SSL_WRITING;
545                         if (BIO_flush(s->wbio) <= 0)
546                                 {
547                                 ret= -1;
548                                 goto end;
549                                 }
550                         s->rwstate=SSL_NOTHING;
551
552                         s->state=s->s3->tmp.next_state;
553                         break;
554
555                 case SSL3_ST_SR_CERT_A:
556                 case SSL3_ST_SR_CERT_B:
557                         /* Check for second client hello (MS SGC) */
558                         ret = ssl3_check_client_hello(s);
559                         if (ret <= 0)
560                                 goto end;
561                         if (ret == 2)
562                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
563                         else {
564                                 if (s->s3->tmp.cert_request)
565                                         {
566                                         ret=ssl3_get_client_certificate(s);
567                                         if (ret <= 0) goto end;
568                                         }
569                                 s->init_num=0;
570                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
571                         }
572                         break;
573
574                 case SSL3_ST_SR_KEY_EXCH_A:
575                 case SSL3_ST_SR_KEY_EXCH_B:
576                         ret=ssl3_get_client_key_exchange(s);
577                         if (ret <= 0)
578                                 goto end;
579                         if (ret == 2)
580                                 {
581                                 /* For the ECDH ciphersuites when
582                                  * the client sends its ECDH pub key in
583                                  * a certificate, the CertificateVerify
584                                  * message is not sent.
585                                  * Also for GOST ciphersuites when
586                                  * the client uses its key from the certificate
587                                  * for key exchange.
588                                  */
589 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
590                                 s->state=SSL3_ST_SR_FINISHED_A;
591 #else
592                                 if (s->s3->next_proto_neg_seen)
593                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
594                                 else
595                                         s->state=SSL3_ST_SR_FINISHED_A;
596 #endif
597                                 s->init_num = 0;
598                                 }
599                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
600                                 {
601                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
602                                 s->init_num=0;
603                                 if (!s->session->peer)
604                                         break;
605                                 /* For TLS v1.2 freeze the handshake buffer
606                                  * at this point and digest cached records.
607                                  */
608                                 if (!s->s3->handshake_buffer)
609                                         {
610                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
611                                         return -1;
612                                         }
613                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
614                                 if (!ssl3_digest_cached_records(s))
615                                         return -1;
616                                 }
617                         else
618                                 {
619                                 int offset=0;
620                                 int dgst_num;
621
622                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
623                                 s->init_num=0;
624
625                                 /* We need to get hashes here so if there is
626                                  * a client cert, it can be verified
627                                  * FIXME - digest processing for CertificateVerify
628                                  * should be generalized. But it is next step
629                                  */
630                                 if (s->s3->handshake_buffer)
631                                         if (!ssl3_digest_cached_records(s))
632                                                 return -1;
633                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
634                                         if (s->s3->handshake_dgst[dgst_num]) 
635                                                 {
636                                                 int dgst_size;
637
638                                                 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]));
639                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
640                                                 if (dgst_size < 0)
641                                                         {
642                                                         ret = -1;
643                                                         goto end;
644                                                         }
645                                                 offset+=dgst_size;
646                                                 }               
647                                 }
648                         break;
649
650                 case SSL3_ST_SR_CERT_VRFY_A:
651                 case SSL3_ST_SR_CERT_VRFY_B:
652
653                         /* we should decide if we expected this one */
654                         ret=ssl3_get_cert_verify(s);
655                         if (ret <= 0) goto end;
656
657 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
658                         s->state=SSL3_ST_SR_FINISHED_A;
659 #else
660                         if (s->s3->next_proto_neg_seen)
661                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
662                         else
663                                 s->state=SSL3_ST_SR_FINISHED_A;
664 #endif
665                         s->init_num=0;
666                         break;
667
668 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
669                 case SSL3_ST_SR_NEXT_PROTO_A:
670                 case SSL3_ST_SR_NEXT_PROTO_B:
671                         ret=ssl3_get_next_proto(s);
672                         if (ret <= 0) goto end;
673                         s->init_num = 0;
674                         s->state=SSL3_ST_SR_FINISHED_A;
675                         break;
676 #endif
677
678                 case SSL3_ST_SR_FINISHED_A:
679                 case SSL3_ST_SR_FINISHED_B:
680                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
681                                 SSL3_ST_SR_FINISHED_B);
682                         if (ret <= 0) goto end;
683                         if (s->hit)
684                                 s->state=SSL_ST_OK;
685 #ifndef OPENSSL_NO_TLSEXT
686                         else if (s->tlsext_ticket_expected)
687                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
688 #endif
689                         else
690                                 s->state=SSL3_ST_SW_CHANGE_A;
691                         s->init_num=0;
692                         break;
693
694 #ifndef OPENSSL_NO_TLSEXT
695                 case SSL3_ST_SW_SESSION_TICKET_A:
696                 case SSL3_ST_SW_SESSION_TICKET_B:
697                         ret=ssl3_send_newsession_ticket(s);
698                         if (ret <= 0) goto end;
699                         s->state=SSL3_ST_SW_CHANGE_A;
700                         s->init_num=0;
701                         break;
702
703                 case SSL3_ST_SW_CERT_STATUS_A:
704                 case SSL3_ST_SW_CERT_STATUS_B:
705                         ret=ssl3_send_cert_status(s);
706                         if (ret <= 0) goto end;
707                         s->state=SSL3_ST_SW_KEY_EXCH_A;
708                         s->init_num=0;
709                         break;
710
711 #endif
712
713                 case SSL3_ST_SW_CHANGE_A:
714                 case SSL3_ST_SW_CHANGE_B:
715
716                         s->session->cipher=s->s3->tmp.new_cipher;
717                         if (!s->method->ssl3_enc->setup_key_block(s))
718                                 { ret= -1; goto end; }
719
720                         ret=ssl3_send_change_cipher_spec(s,
721                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
722
723                         if (ret <= 0) goto end;
724                         s->state=SSL3_ST_SW_FINISHED_A;
725                         s->init_num=0;
726
727                         if (!s->method->ssl3_enc->change_cipher_state(s,
728                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
729                                 {
730                                 ret= -1;
731                                 goto end;
732                                 }
733
734                         break;
735
736                 case SSL3_ST_SW_FINISHED_A:
737                 case SSL3_ST_SW_FINISHED_B:
738                         ret=ssl3_send_finished(s,
739                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
740                                 s->method->ssl3_enc->server_finished_label,
741                                 s->method->ssl3_enc->server_finished_label_len);
742                         if (ret <= 0) goto end;
743                         s->state=SSL3_ST_SW_FLUSH;
744                         if (s->hit)
745                                 {
746 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
747                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
748 #else
749                                 if (s->s3->next_proto_neg_seen)
750                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
751                                 else
752                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
753 #endif
754                                 }
755                         else
756                                 s->s3->tmp.next_state=SSL_ST_OK;
757                         s->init_num=0;
758                         break;
759
760                 case SSL_ST_OK:
761                         /* clean a few things up */
762                         ssl3_cleanup_key_block(s);
763
764                         BUF_MEM_free(s->init_buf);
765                         s->init_buf=NULL;
766
767                         /* remove buffering on output */
768                         ssl_free_wbio_buffer(s);
769
770                         s->init_num=0;
771
772                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
773                                 {
774                                 s->renegotiate=0;
775                                 s->new_session=0;
776                                 
777                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
778                                 
779                                 s->ctx->stats.sess_accept_good++;
780                                 /* s->server=1; */
781                                 s->handshake_func=ssl3_accept;
782
783                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
784                                 }
785                         
786                         ret = 1;
787                         goto end;
788                         /* break; */
789
790                 default:
791                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
792                         ret= -1;
793                         goto end;
794                         /* break; */
795                         }
796                 
797                 if (!s->s3->tmp.reuse_message && !skip)
798                         {
799                         if (s->debug)
800                                 {
801                                 if ((ret=BIO_flush(s->wbio)) <= 0)
802                                         goto end;
803                                 }
804
805
806                         if ((cb != NULL) && (s->state != state))
807                                 {
808                                 new_state=s->state;
809                                 s->state=state;
810                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
811                                 s->state=new_state;
812                                 }
813                         }
814                 skip=0;
815                 }
816 end:
817         /* BIO_flush(s->wbio); */
818
819         s->in_handshake--;
820         if (cb != NULL)
821                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
822         return(ret);
823         }
824
825 int ssl3_send_hello_request(SSL *s)
826         {
827         unsigned char *p;
828
829         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
830                 {
831                 p=(unsigned char *)s->init_buf->data;
832                 *(p++)=SSL3_MT_HELLO_REQUEST;
833                 *(p++)=0;
834                 *(p++)=0;
835                 *(p++)=0;
836
837                 s->state=SSL3_ST_SW_HELLO_REQ_B;
838                 /* number of bytes to write */
839                 s->init_num=4;
840                 s->init_off=0;
841                 }
842
843         /* SSL3_ST_SW_HELLO_REQ_B */
844         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
845         }
846
847 int ssl3_check_client_hello(SSL *s)
848         {
849         int ok;
850         long n;
851
852         /* this function is called when we really expect a Certificate message,
853          * so permit appropriate message length */
854         n=s->method->ssl_get_message(s,
855                 SSL3_ST_SR_CERT_A,
856                 SSL3_ST_SR_CERT_B,
857                 -1,
858                 s->max_cert_list,
859                 &ok);
860         if (!ok) return((int)n);
861         s->s3->tmp.reuse_message = 1;
862         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
863                 {
864                 /* Throw away what we have done so far in the current handshake,
865                  * which will now be aborted. (A full SSL_clear would be too much.) */
866 #ifndef OPENSSL_NO_DH
867                 if (s->s3->tmp.dh != NULL)
868                         {
869                         DH_free(s->s3->tmp.dh);
870                         s->s3->tmp.dh = NULL;
871                         }
872 #endif
873 #ifndef OPENSSL_NO_ECDH
874                 if (s->s3->tmp.ecdh != NULL)
875                         {
876                         EC_KEY_free(s->s3->tmp.ecdh);
877                         s->s3->tmp.ecdh = NULL;
878                         }
879 #endif
880                 return 2;
881                 }
882         return 1;
883 }
884
885 int ssl3_get_client_hello(SSL *s)
886         {
887         int i,j,ok,al,ret= -1;
888         unsigned int cookie_len;
889         long n;
890         unsigned long id;
891         unsigned char *p,*d,*q;
892         SSL_CIPHER *c;
893 #ifndef OPENSSL_NO_COMP
894         SSL_COMP *comp=NULL;
895 #endif
896         STACK_OF(SSL_CIPHER) *ciphers=NULL;
897
898         /* We do this so that we will respond with our native type.
899          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
900          * This down switching should be handled by a different method.
901          * If we are SSLv3, we will respond with SSLv3, even if prompted with
902          * TLSv1.
903          */
904         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
905                 )
906                 {
907                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
908                 }
909         s->first_packet=1;
910         n=s->method->ssl_get_message(s,
911                 SSL3_ST_SR_CLNT_HELLO_B,
912                 SSL3_ST_SR_CLNT_HELLO_C,
913                 SSL3_MT_CLIENT_HELLO,
914                 SSL3_RT_MAX_PLAIN_LENGTH,
915                 &ok);
916
917         if (!ok) return((int)n);
918         s->first_packet=0;
919         d=p=(unsigned char *)s->init_msg;
920
921         /* use version from inside client hello, not from record header
922          * (may differ: see RFC 2246, Appendix E, second paragraph) */
923         s->client_version=(((int)p[0])<<8)|(int)p[1];
924         p+=2;
925
926         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
927             (s->version != DTLS1_VERSION && s->client_version < s->version))
928                 {
929                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
930                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
931                         {
932                         /* similar to ssl3_get_record, send alert using remote version number */
933                         s->version = s->client_version;
934                         }
935                 al = SSL_AD_PROTOCOL_VERSION;
936                 goto f_err;
937                 }
938
939         /* If we require cookies and this ClientHello doesn't
940          * contain one, just return since we do not want to
941          * allocate any memory yet. So check cookie length...
942          */
943         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
944                 {
945                 unsigned int session_length, cookie_length;
946                 
947                 session_length = *(p + SSL3_RANDOM_SIZE);
948                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
949
950                 if (cookie_length == 0)
951                         return 1;
952                 }
953
954         /* load the client random */
955         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
956         p+=SSL3_RANDOM_SIZE;
957
958         /* get the session-id */
959         j= *(p++);
960
961         s->hit=0;
962         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
963          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
964          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
965          * than a change to default behavior so that applications relying on this for security
966          * won't even compile against older library versions).
967          *
968          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
969          * renegotiation but not a new session (s->new_session remains unset): for servers,
970          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
971          * setting will be ignored.
972          */
973         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
974                 {
975                 if (!ssl_get_new_session(s,1))
976                         goto err;
977                 }
978         else
979                 {
980                 i=ssl_get_prev_session(s, p, j, d + n);
981                 if (i == 1)
982                         { /* previous session */
983                         s->hit=1;
984                         }
985                 else if (i == -1)
986                         goto err;
987                 else /* i == 0 */
988                         {
989                         if (!ssl_get_new_session(s,1))
990                                 goto err;
991                         }
992                 }
993
994         p+=j;
995
996         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
997                 {
998                 /* cookie stuff */
999                 cookie_len = *(p++);
1000
1001                 /* 
1002                  * The ClientHello may contain a cookie even if the
1003                  * HelloVerify message has not been sent--make sure that it
1004                  * does not cause an overflow.
1005                  */
1006                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1007                         {
1008                         /* too much data */
1009                         al = SSL_AD_DECODE_ERROR;
1010                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1011                         goto f_err;
1012                         }
1013
1014                 /* verify the cookie if appropriate option is set. */
1015                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1016                         cookie_len > 0)
1017                         {
1018                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1019
1020                         if ( s->ctx->app_verify_cookie_cb != NULL)
1021                                 {
1022                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1023                                         cookie_len) == 0)
1024                                         {
1025                                         al=SSL_AD_HANDSHAKE_FAILURE;
1026                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1027                                                 SSL_R_COOKIE_MISMATCH);
1028                                         goto f_err;
1029                                         }
1030                                 /* else cookie verification succeeded */
1031                                 }
1032                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1033                                                   s->d1->cookie_len) != 0) /* default verification */
1034                                 {
1035                                         al=SSL_AD_HANDSHAKE_FAILURE;
1036                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1037                                                 SSL_R_COOKIE_MISMATCH);
1038                                         goto f_err;
1039                                 }
1040
1041                         ret = 2;
1042                         }
1043
1044                 p += cookie_len;
1045                 }
1046
1047         n2s(p,i);
1048         if ((i == 0) && (j != 0))
1049                 {
1050                 /* we need a cipher if we are not resuming a session */
1051                 al=SSL_AD_ILLEGAL_PARAMETER;
1052                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1053                 goto f_err;
1054                 }
1055         if ((p+i) >= (d+n))
1056                 {
1057                 /* not enough data */
1058                 al=SSL_AD_DECODE_ERROR;
1059                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1060                 goto f_err;
1061                 }
1062         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1063                 == NULL))
1064                 {
1065                 goto err;
1066                 }
1067         p+=i;
1068
1069         /* If it is a hit, check that the cipher is in the list */
1070         if ((s->hit) && (i > 0))
1071                 {
1072                 j=0;
1073                 id=s->session->cipher->id;
1074
1075 #ifdef CIPHER_DEBUG
1076                 printf("client sent %d ciphers\n",sk_num(ciphers));
1077 #endif
1078                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1079                         {
1080                         c=sk_SSL_CIPHER_value(ciphers,i);
1081 #ifdef CIPHER_DEBUG
1082                         printf("client [%2d of %2d]:%s\n",
1083                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1084 #endif
1085                         if (c->id == id)
1086                                 {
1087                                 j=1;
1088                                 break;
1089                                 }
1090                         }
1091 /* Disabled because it can be used in a ciphersuite downgrade
1092  * attack: CVE-2010-4180.
1093  */
1094 #if 0
1095                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1096                         {
1097                         /* Special case as client bug workaround: the previously used cipher may
1098                          * not be in the current list, the client instead might be trying to
1099                          * continue using a cipher that before wasn't chosen due to server
1100                          * preferences.  We'll have to reject the connection if the cipher is not
1101                          * enabled, though. */
1102                         c = sk_SSL_CIPHER_value(ciphers, 0);
1103                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1104                                 {
1105                                 s->session->cipher = c;
1106                                 j = 1;
1107                                 }
1108                         }
1109 #endif
1110                 if (j == 0)
1111                         {
1112                         /* we need to have the cipher in the cipher
1113                          * list if we are asked to reuse it */
1114                         al=SSL_AD_ILLEGAL_PARAMETER;
1115                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1116                         goto f_err;
1117                         }
1118                 }
1119
1120         /* compression */
1121         i= *(p++);
1122         if ((p+i) > (d+n))
1123                 {
1124                 /* not enough data */
1125                 al=SSL_AD_DECODE_ERROR;
1126                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1127                 goto f_err;
1128                 }
1129         q=p;
1130         for (j=0; j<i; j++)
1131                 {
1132                 if (p[j] == 0) break;
1133                 }
1134
1135         p+=i;
1136         if (j >= i)
1137                 {
1138                 /* no compress */
1139                 al=SSL_AD_DECODE_ERROR;
1140                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1141                 goto f_err;
1142                 }
1143
1144 #ifndef OPENSSL_NO_TLSEXT
1145         /* TLS extensions*/
1146         if (s->version >= SSL3_VERSION)
1147                 {
1148                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1149                         {
1150                         /* 'al' set by ssl_parse_clienthello_tlsext */
1151                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1152                         goto f_err;
1153                         }
1154                 }
1155                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1156                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1157                         goto err;
1158                 }
1159
1160         /* Check if we want to use external pre-shared secret for this
1161          * handshake for not reused session only. We need to generate
1162          * server_random before calling tls_session_secret_cb in order to allow
1163          * SessionTicket processing to use it in key derivation. */
1164         {
1165                 unsigned long Time;
1166                 unsigned char *pos;
1167                 Time=(unsigned long)time(NULL);                 /* Time */
1168                 pos=s->s3->server_random;
1169                 l2n(Time,pos);
1170                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1171                         {
1172                         al=SSL_AD_INTERNAL_ERROR;
1173                         goto f_err;
1174                         }
1175         }
1176
1177         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1178                 {
1179                 SSL_CIPHER *pref_cipher=NULL;
1180
1181                 s->session->master_key_length=sizeof(s->session->master_key);
1182                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1183                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1184                         {
1185                         s->hit=1;
1186                         s->session->ciphers=ciphers;
1187                         s->session->verify_result=X509_V_OK;
1188
1189                         ciphers=NULL;
1190
1191                         /* check if some cipher was preferred by call back */
1192                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1193                         if (pref_cipher == NULL)
1194                                 {
1195                                 al=SSL_AD_HANDSHAKE_FAILURE;
1196                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1197                                 goto f_err;
1198                                 }
1199
1200                         s->session->cipher=pref_cipher;
1201
1202                         if (s->cipher_list)
1203                                 sk_SSL_CIPHER_free(s->cipher_list);
1204
1205                         if (s->cipher_list_by_id)
1206                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1207
1208                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1209                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1210                         }
1211                 }
1212 #endif
1213
1214         /* Worst case, we will use the NULL compression, but if we have other
1215          * options, we will now look for them.  We have i-1 compression
1216          * algorithms from the client, starting at q. */
1217         s->s3->tmp.new_compression=NULL;
1218 #ifndef OPENSSL_NO_COMP
1219         /* This only happens if we have a cache hit */
1220         if (s->session->compress_meth != 0)
1221                 {
1222                 int m, comp_id = s->session->compress_meth;
1223                 /* Perform sanity checks on resumed compression algorithm */
1224                 /* Can't disable compression */
1225                 if (s->options & SSL_OP_NO_COMPRESSION)
1226                         {
1227                         al=SSL_AD_INTERNAL_ERROR;
1228                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1229                         goto f_err;
1230                         }
1231                 /* Look for resumed compression method */
1232                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1233                         {
1234                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1235                         if (comp_id == comp->id)
1236                                 {
1237                                 s->s3->tmp.new_compression=comp;
1238                                 break;
1239                                 }
1240                         }
1241                 if (s->s3->tmp.new_compression == NULL)
1242                         {
1243                         al=SSL_AD_INTERNAL_ERROR;
1244                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1245                         goto f_err;
1246                         }
1247                 /* Look for resumed method in compression list */
1248                 for (m = 0; m < i; m++)
1249                         {
1250                         if (q[m] == comp_id)
1251                                 break;
1252                         }
1253                 if (m >= i)
1254                         {
1255                         al=SSL_AD_ILLEGAL_PARAMETER;
1256                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1257                         goto f_err;
1258                         }
1259                 }
1260         else if (s->hit)
1261                 comp = NULL;
1262         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1263                 { /* See if we have a match */
1264                 int m,nn,o,v,done=0;
1265
1266                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1267                 for (m=0; m<nn; m++)
1268                         {
1269                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1270                         v=comp->id;
1271                         for (o=0; o<i; o++)
1272                                 {
1273                                 if (v == q[o])
1274                                         {
1275                                         done=1;
1276                                         break;
1277                                         }
1278                                 }
1279                         if (done) break;
1280                         }
1281                 if (done)
1282                         s->s3->tmp.new_compression=comp;
1283                 else
1284                         comp=NULL;
1285                 }
1286 #else
1287         /* If compression is disabled we'd better not try to resume a session
1288          * using compression.
1289          */
1290         if (s->session->compress_meth != 0)
1291                 {
1292                 al=SSL_AD_INTERNAL_ERROR;
1293                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1294                 goto f_err;
1295                 }
1296 #endif
1297
1298         /* Given s->session->ciphers and SSL_get_ciphers, we must
1299          * pick a cipher */
1300
1301         if (!s->hit)
1302                 {
1303 #ifdef OPENSSL_NO_COMP
1304                 s->session->compress_meth=0;
1305 #else
1306                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1307 #endif
1308                 if (s->session->ciphers != NULL)
1309                         sk_SSL_CIPHER_free(s->session->ciphers);
1310                 s->session->ciphers=ciphers;
1311                 if (ciphers == NULL)
1312                         {
1313                         al=SSL_AD_ILLEGAL_PARAMETER;
1314                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1315                         goto f_err;
1316                         }
1317                 ciphers=NULL;
1318                 c=ssl3_choose_cipher(s,s->session->ciphers,
1319                                      SSL_get_ciphers(s));
1320
1321                 if (c == NULL)
1322                         {
1323                         al=SSL_AD_HANDSHAKE_FAILURE;
1324                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1325                         goto f_err;
1326                         }
1327                 s->s3->tmp.new_cipher=c;
1328                 /* check whether we should disable session resumption */
1329                 if (s->not_resumable_session_cb != NULL)
1330                         s->session->not_resumable=s->not_resumable_session_cb(s,
1331                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1332                 if (s->session->not_resumable)
1333                         /* do not send a session ticket */
1334                         s->tlsext_ticket_expected = 0;
1335                 }
1336         else
1337                 {
1338                 /* Session-id reuse */
1339 #ifdef REUSE_CIPHER_BUG
1340                 STACK_OF(SSL_CIPHER) *sk;
1341                 SSL_CIPHER *nc=NULL;
1342                 SSL_CIPHER *ec=NULL;
1343
1344                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1345                         {
1346                         sk=s->session->ciphers;
1347                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1348                                 {
1349                                 c=sk_SSL_CIPHER_value(sk,i);
1350                                 if (c->algorithm_enc & SSL_eNULL)
1351                                         nc=c;
1352                                 if (SSL_C_IS_EXPORT(c))
1353                                         ec=c;
1354                                 }
1355                         if (nc != NULL)
1356                                 s->s3->tmp.new_cipher=nc;
1357                         else if (ec != NULL)
1358                                 s->s3->tmp.new_cipher=ec;
1359                         else
1360                                 s->s3->tmp.new_cipher=s->session->cipher;
1361                         }
1362                 else
1363 #endif
1364                 s->s3->tmp.new_cipher=s->session->cipher;
1365                 }
1366
1367         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1368                 {
1369                 if (!ssl3_digest_cached_records(s))
1370                         goto f_err;
1371                 }
1372         
1373         /* we now have the following setup. 
1374          * client_random
1375          * cipher_list          - our prefered list of ciphers
1376          * ciphers              - the clients prefered list of ciphers
1377          * compression          - basically ignored right now
1378          * ssl version is set   - sslv3
1379          * s->session           - The ssl session has been setup.
1380          * s->hit               - session reuse flag
1381          * s->tmp.new_cipher    - the new cipher to use.
1382          */
1383
1384         if (ret < 0) ret=1;
1385         if (0)
1386                 {
1387 f_err:
1388                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1389                 }
1390 err:
1391         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1392         return(ret);
1393         }
1394
1395 int ssl3_send_server_hello(SSL *s)
1396         {
1397         unsigned char *buf;
1398         unsigned char *p,*d;
1399         int i,sl;
1400         unsigned long l;
1401 #ifdef OPENSSL_NO_TLSEXT
1402         unsigned long Time;
1403 #endif
1404
1405         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1406                 {
1407                 buf=(unsigned char *)s->init_buf->data;
1408 #ifdef OPENSSL_NO_TLSEXT
1409                 p=s->s3->server_random;
1410                 /* Generate server_random if it was not needed previously */
1411                 Time=(unsigned long)time(NULL);                 /* Time */
1412                 l2n(Time,p);
1413                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1414                         return -1;
1415 #endif
1416                 /* Do the message type and length last */
1417                 d=p= &(buf[4]);
1418
1419                 *(p++)=s->version>>8;
1420                 *(p++)=s->version&0xff;
1421
1422                 /* Random stuff */
1423                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1424                 p+=SSL3_RANDOM_SIZE;
1425
1426                 /* There are several cases for the session ID to send
1427                  * back in the server hello:
1428                  * - For session reuse from the session cache,
1429                  *   we send back the old session ID.
1430                  * - If stateless session reuse (using a session ticket)
1431                  *   is successful, we send back the client's "session ID"
1432                  *   (which doesn't actually identify the session).
1433                  * - If it is a new session, we send back the new
1434                  *   session ID.
1435                  * - However, if we want the new session to be single-use,
1436                  *   we send back a 0-length session ID.
1437                  * s->hit is non-zero in either case of session reuse,
1438                  * so the following won't overwrite an ID that we're supposed
1439                  * to send back.
1440                  */
1441                 if (s->session->not_resumable ||
1442                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1443                                 && !s->hit))
1444                         s->session->session_id_length=0;
1445
1446                 sl=s->session->session_id_length;
1447                 if (sl > (int)sizeof(s->session->session_id))
1448                         {
1449                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1450                         return -1;
1451                         }
1452                 *(p++)=sl;
1453                 memcpy(p,s->session->session_id,sl);
1454                 p+=sl;
1455
1456                 /* put the cipher */
1457                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1458                 p+=i;
1459
1460                 /* put the compression method */
1461 #ifdef OPENSSL_NO_COMP
1462                         *(p++)=0;
1463 #else
1464                 if (s->s3->tmp.new_compression == NULL)
1465                         *(p++)=0;
1466                 else
1467                         *(p++)=s->s3->tmp.new_compression->id;
1468 #endif
1469 #ifndef OPENSSL_NO_TLSEXT
1470                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1471                         {
1472                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1473                         return -1;
1474                         }
1475                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1476                         {
1477                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1478                         return -1;
1479                         }
1480 #endif
1481                 /* do the header */
1482                 l=(p-d);
1483                 d=buf;
1484                 *(d++)=SSL3_MT_SERVER_HELLO;
1485                 l2n3(l,d);
1486
1487                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1488                 /* number of bytes to write */
1489                 s->init_num=p-buf;
1490                 s->init_off=0;
1491                 }
1492
1493         /* SSL3_ST_SW_SRVR_HELLO_B */
1494         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1495         }
1496
1497 int ssl3_send_server_done(SSL *s)
1498         {
1499         unsigned char *p;
1500
1501         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1502                 {
1503                 p=(unsigned char *)s->init_buf->data;
1504
1505                 /* do the header */
1506                 *(p++)=SSL3_MT_SERVER_DONE;
1507                 *(p++)=0;
1508                 *(p++)=0;
1509                 *(p++)=0;
1510
1511                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1512                 /* number of bytes to write */
1513                 s->init_num=4;
1514                 s->init_off=0;
1515                 }
1516
1517         /* SSL3_ST_SW_SRVR_DONE_B */
1518         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1519         }
1520
1521 int ssl3_send_server_key_exchange(SSL *s)
1522         {
1523 #ifndef OPENSSL_NO_RSA
1524         unsigned char *q;
1525         int j,num;
1526         RSA *rsa;
1527         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1528         unsigned int u;
1529 #endif
1530 #ifndef OPENSSL_NO_DH
1531         DH *dh=NULL,*dhp;
1532 #endif
1533 #ifndef OPENSSL_NO_ECDH
1534         EC_KEY *ecdh=NULL, *ecdhp;
1535         unsigned char *encodedPoint = NULL;
1536         int encodedlen = 0;
1537         int curve_id = 0;
1538         BN_CTX *bn_ctx = NULL; 
1539 #endif
1540         EVP_PKEY *pkey;
1541         const EVP_MD *md = NULL;
1542         unsigned char *p,*d;
1543         int al,i;
1544         unsigned long type;
1545         int n;
1546         CERT *cert;
1547         BIGNUM *r[4];
1548         int nr[4],kn;
1549         BUF_MEM *buf;
1550         EVP_MD_CTX md_ctx;
1551
1552         EVP_MD_CTX_init(&md_ctx);
1553         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1554                 {
1555                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1556                 cert=s->cert;
1557
1558                 buf=s->init_buf;
1559
1560                 r[0]=r[1]=r[2]=r[3]=NULL;
1561                 n=0;
1562 #ifndef OPENSSL_NO_RSA
1563                 if (type & SSL_kRSA)
1564                         {
1565                         rsa=cert->rsa_tmp;
1566                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1567                                 {
1568                                 rsa=s->cert->rsa_tmp_cb(s,
1569                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1570                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1571                                 if(rsa == NULL)
1572                                 {
1573                                         al=SSL_AD_HANDSHAKE_FAILURE;
1574                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1575                                         goto f_err;
1576                                 }
1577                                 RSA_up_ref(rsa);
1578                                 cert->rsa_tmp=rsa;
1579                                 }
1580                         if (rsa == NULL)
1581                                 {
1582                                 al=SSL_AD_HANDSHAKE_FAILURE;
1583                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1584                                 goto f_err;
1585                                 }
1586                         r[0]=rsa->n;
1587                         r[1]=rsa->e;
1588                         s->s3->tmp.use_rsa_tmp=1;
1589                         }
1590                 else
1591 #endif
1592 #ifndef OPENSSL_NO_DH
1593                         if (type & SSL_kEDH)
1594                         {
1595                         dhp=cert->dh_tmp;
1596                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1597                                 dhp=s->cert->dh_tmp_cb(s,
1598                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1599                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1600                         if (dhp == NULL)
1601                                 {
1602                                 al=SSL_AD_HANDSHAKE_FAILURE;
1603                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1604                                 goto f_err;
1605                                 }
1606
1607                         if (s->s3->tmp.dh != NULL)
1608                                 {
1609                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1610                                 goto err;
1611                                 }
1612
1613                         if ((dh=DHparams_dup(dhp)) == NULL)
1614                                 {
1615                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1616                                 goto err;
1617                                 }
1618
1619                         s->s3->tmp.dh=dh;
1620                         if ((dhp->pub_key == NULL ||
1621                              dhp->priv_key == NULL ||
1622                              (s->options & SSL_OP_SINGLE_DH_USE)))
1623                                 {
1624                                 if(!DH_generate_key(dh))
1625                                     {
1626                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1627                                            ERR_R_DH_LIB);
1628                                     goto err;
1629                                     }
1630                                 }
1631                         else
1632                                 {
1633                                 dh->pub_key=BN_dup(dhp->pub_key);
1634                                 dh->priv_key=BN_dup(dhp->priv_key);
1635                                 if ((dh->pub_key == NULL) ||
1636                                         (dh->priv_key == NULL))
1637                                         {
1638                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1639                                         goto err;
1640                                         }
1641                                 }
1642                         r[0]=dh->p;
1643                         r[1]=dh->g;
1644                         r[2]=dh->pub_key;
1645                         }
1646                 else 
1647 #endif
1648 #ifndef OPENSSL_NO_ECDH
1649                         if (type & SSL_kEECDH)
1650                         {
1651                         const EC_GROUP *group;
1652
1653                         ecdhp=cert->ecdh_tmp;
1654                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1655                                 {
1656                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1657                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1658                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1659                                 }
1660                         if (ecdhp == NULL)
1661                                 {
1662                                 al=SSL_AD_HANDSHAKE_FAILURE;
1663                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1664                                 goto f_err;
1665                                 }
1666
1667                         if (s->s3->tmp.ecdh != NULL)
1668                                 {
1669                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1670                                 goto err;
1671                                 }
1672
1673                         /* Duplicate the ECDH structure. */
1674                         if (ecdhp == NULL)
1675                                 {
1676                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1677                                 goto err;
1678                                 }
1679                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1680                                 {
1681                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1682                                 goto err;
1683                                 }
1684
1685                         s->s3->tmp.ecdh=ecdh;
1686                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1687                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1688                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1689                                 {
1690                                 if(!EC_KEY_generate_key(ecdh))
1691                                     {
1692                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1693                                     goto err;
1694                                     }
1695                                 }
1696
1697                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1698                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1699                             (EC_KEY_get0_private_key(ecdh) == NULL))
1700                                 {
1701                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1702                                 goto err;
1703                                 }
1704
1705                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1706                             (EC_GROUP_get_degree(group) > 163)) 
1707                                 {
1708                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1709                                 goto err;
1710                                 }
1711
1712                         /* XXX: For now, we only support ephemeral ECDH
1713                          * keys over named (not generic) curves. For 
1714                          * supported named curves, curve_id is non-zero.
1715                          */
1716                         if ((curve_id = 
1717                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1718                             == 0)
1719                                 {
1720                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1721                                 goto err;
1722                                 }
1723
1724                         /* Encode the public key.
1725                          * First check the size of encoding and
1726                          * allocate memory accordingly.
1727                          */
1728                         encodedlen = EC_POINT_point2oct(group, 
1729                             EC_KEY_get0_public_key(ecdh),
1730                             POINT_CONVERSION_UNCOMPRESSED, 
1731                             NULL, 0, NULL);
1732
1733                         encodedPoint = (unsigned char *) 
1734                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1735                         bn_ctx = BN_CTX_new();
1736                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1737                                 {
1738                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1739                                 goto err;
1740                                 }
1741
1742
1743                         encodedlen = EC_POINT_point2oct(group, 
1744                             EC_KEY_get0_public_key(ecdh), 
1745                             POINT_CONVERSION_UNCOMPRESSED, 
1746                             encodedPoint, encodedlen, bn_ctx);
1747
1748                         if (encodedlen == 0) 
1749                                 {
1750                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1751                                 goto err;
1752                                 }
1753
1754                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1755
1756                         /* XXX: For now, we only support named (not 
1757                          * generic) curves in ECDH ephemeral key exchanges.
1758                          * In this situation, we need four additional bytes
1759                          * to encode the entire ServerECDHParams
1760                          * structure. 
1761                          */
1762                         n = 4 + encodedlen;
1763
1764                         /* We'll generate the serverKeyExchange message
1765                          * explicitly so we can set these to NULLs
1766                          */
1767                         r[0]=NULL;
1768                         r[1]=NULL;
1769                         r[2]=NULL;
1770                         r[3]=NULL;
1771                         }
1772                 else 
1773 #endif /* !OPENSSL_NO_ECDH */
1774 #ifndef OPENSSL_NO_PSK
1775                         if (type & SSL_kPSK)
1776                                 {
1777                                 /* reserve size for record length and PSK identity hint*/
1778                                 n+=2+strlen(s->ctx->psk_identity_hint);
1779                                 }
1780                         else
1781 #endif /* !OPENSSL_NO_PSK */
1782 #ifndef OPENSSL_NO_SRP
1783                 if (type & SSL_kSRP)
1784                         {
1785                         if ((s->srp_ctx.N == NULL) ||
1786                                 (s->srp_ctx.g == NULL) ||
1787                                 (s->srp_ctx.s == NULL) ||
1788                                 (s->srp_ctx.B == NULL))
1789                                 {
1790                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1791                                 goto err;
1792                                 }
1793                         r[0]=s->srp_ctx.N;
1794                         r[1]=s->srp_ctx.g;
1795                         r[2]=s->srp_ctx.s;
1796                         r[3]=s->srp_ctx.B;
1797                         }
1798                 else 
1799 #endif
1800                         {
1801                         al=SSL_AD_HANDSHAKE_FAILURE;
1802                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1803                         goto f_err;
1804                         }
1805                 for (i=0; r[i] != NULL && i<4; i++)
1806                         {
1807                         nr[i]=BN_num_bytes(r[i]);
1808 #ifndef OPENSSL_NO_SRP
1809                         if ((i == 2) && (type & SSL_kSRP))
1810                                 n+=1+nr[i];
1811                         else
1812 #endif
1813                         n+=2+nr[i];
1814                         }
1815
1816                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1817                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1818                         {
1819                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1820                                 == NULL)
1821                                 {
1822                                 al=SSL_AD_DECODE_ERROR;
1823                                 goto f_err;
1824                                 }
1825                         kn=EVP_PKEY_size(pkey);
1826                         }
1827                 else
1828                         {
1829                         pkey=NULL;
1830                         kn=0;
1831                         }
1832
1833                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1834                         {
1835                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1836                         goto err;
1837                         }
1838                 d=(unsigned char *)s->init_buf->data;
1839                 p= &(d[4]);
1840
1841                 for (i=0; r[i] != NULL && i<4; i++)
1842                         {
1843 #ifndef OPENSSL_NO_SRP
1844                         if ((i == 2) && (type & SSL_kSRP))
1845                                 {
1846                                 *p = nr[i];
1847                                 p++;
1848                                 }
1849                         else
1850 #endif
1851                         s2n(nr[i],p);
1852                         BN_bn2bin(r[i],p);
1853                         p+=nr[i];
1854                         }
1855
1856 #ifndef OPENSSL_NO_ECDH
1857                 if (type & SSL_kEECDH) 
1858                         {
1859                         /* XXX: For now, we only support named (not generic) curves.
1860                          * In this situation, the serverKeyExchange message has:
1861                          * [1 byte CurveType], [2 byte CurveName]
1862                          * [1 byte length of encoded point], followed by
1863                          * the actual encoded point itself
1864                          */
1865                         *p = NAMED_CURVE_TYPE;
1866                         p += 1;
1867                         *p = 0;
1868                         p += 1;
1869                         *p = curve_id;
1870                         p += 1;
1871                         *p = encodedlen;
1872                         p += 1;
1873                         memcpy((unsigned char*)p, 
1874                             (unsigned char *)encodedPoint, 
1875                             encodedlen);
1876                         OPENSSL_free(encodedPoint);
1877                         encodedPoint = NULL;
1878                         p += encodedlen;
1879                         }
1880 #endif
1881
1882 #ifndef OPENSSL_NO_PSK
1883                 if (type & SSL_kPSK)
1884                         {
1885                         /* copy PSK identity hint */
1886                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1887                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1888                         p+=strlen(s->ctx->psk_identity_hint);
1889                         }
1890 #endif
1891
1892                 /* not anonymous */
1893                 if (pkey != NULL)
1894                         {
1895                         /* n is the length of the params, they start at &(d[4])
1896                          * and p points to the space at the end. */
1897 #ifndef OPENSSL_NO_RSA
1898                         if (pkey->type == EVP_PKEY_RSA
1899                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1900                                 {
1901                                 q=md_buf;
1902                                 j=0;
1903                                 for (num=2; num > 0; num--)
1904                                         {
1905                                         EVP_MD_CTX_set_flags(&md_ctx,
1906                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1907                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1908                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1909                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1910                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1911                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1912                                         EVP_DigestFinal_ex(&md_ctx,q,
1913                                                 (unsigned int *)&i);
1914                                         q+=i;
1915                                         j+=i;
1916                                         }
1917                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1918                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1919                                         {
1920                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1921                                         goto err;
1922                                         }
1923                                 s2n(u,p);
1924                                 n+=u+2;
1925                                 }
1926                         else
1927 #endif
1928                         if (md)
1929                                 {
1930                                 /* For TLS1.2 and later send signature
1931                                  * algorithm */
1932                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1933                                         {
1934                                         if (!tls12_get_sigandhash(p, pkey, md))
1935                                                 {
1936                                                 /* Should never happen */
1937                                                 al=SSL_AD_INTERNAL_ERROR;
1938                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1939                                                 goto f_err;
1940                                                 }
1941                                         p+=2;
1942                                         }
1943 #ifdef SSL_DEBUG
1944                                 fprintf(stderr, "Using hash %s\n",
1945                                                         EVP_MD_name(md));
1946 #endif
1947                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1948                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1949                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1950                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1951                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1952                                         (unsigned int *)&i,pkey))
1953                                         {
1954                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1955                                         goto err;
1956                                         }
1957                                 s2n(i,p);
1958                                 n+=i+2;
1959                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1960                                         n+= 2;
1961                                 }
1962                         else
1963                                 {
1964                                 /* Is this error check actually needed? */
1965                                 al=SSL_AD_HANDSHAKE_FAILURE;
1966                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1967                                 goto f_err;
1968                                 }
1969                         }
1970
1971                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1972                 l2n3(n,d);
1973
1974                 /* we should now have things packed up, so lets send
1975                  * it off */
1976                 s->init_num=n+4;
1977                 s->init_off=0;
1978                 }
1979
1980         s->state = SSL3_ST_SW_KEY_EXCH_B;
1981         EVP_MD_CTX_cleanup(&md_ctx);
1982         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1983 f_err:
1984         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1985 err:
1986 #ifndef OPENSSL_NO_ECDH
1987         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1988         BN_CTX_free(bn_ctx);
1989 #endif
1990         EVP_MD_CTX_cleanup(&md_ctx);
1991         return(-1);
1992         }
1993
1994 int ssl3_send_certificate_request(SSL *s)
1995         {
1996         unsigned char *p,*d;
1997         int i,j,nl,off,n;
1998         STACK_OF(X509_NAME) *sk=NULL;
1999         X509_NAME *name;
2000         BUF_MEM *buf;
2001
2002         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2003                 {
2004                 buf=s->init_buf;
2005
2006                 d=p=(unsigned char *)&(buf->data[4]);
2007
2008                 /* get the list of acceptable cert types */
2009                 p++;
2010                 n=ssl3_get_req_cert_type(s,p);
2011                 d[0]=n;
2012                 p+=n;
2013                 n++;
2014
2015                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2016                         {
2017                         nl = tls12_get_req_sig_algs(s, p + 2);
2018                         s2n(nl, p);
2019                         p += nl + 2;
2020                         n += nl + 2;
2021                         }
2022
2023                 off=n;
2024                 p+=2;
2025                 n+=2;
2026
2027                 sk=SSL_get_client_CA_list(s);
2028                 nl=0;
2029                 if (sk != NULL)
2030                         {
2031                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2032                                 {
2033                                 name=sk_X509_NAME_value(sk,i);
2034                                 j=i2d_X509_NAME(name,NULL);
2035                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2036                                         {
2037                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2038                                         goto err;
2039                                         }
2040                                 p=(unsigned char *)&(buf->data[4+n]);
2041                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2042                                         {
2043                                         s2n(j,p);
2044                                         i2d_X509_NAME(name,&p);
2045                                         n+=2+j;
2046                                         nl+=2+j;
2047                                         }
2048                                 else
2049                                         {
2050                                         d=p;
2051                                         i2d_X509_NAME(name,&p);
2052                                         j-=2; s2n(j,d); j+=2;
2053                                         n+=j;
2054                                         nl+=j;
2055                                         }
2056                                 }
2057                         }
2058                 /* else no CA names */
2059                 p=(unsigned char *)&(buf->data[4+off]);
2060                 s2n(nl,p);
2061
2062                 d=(unsigned char *)buf->data;
2063                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2064                 l2n3(n,d);
2065
2066                 /* we should now have things packed up, so lets send
2067                  * it off */
2068
2069                 s->init_num=n+4;
2070                 s->init_off=0;
2071 #ifdef NETSCAPE_HANG_BUG
2072                 p=(unsigned char *)s->init_buf->data + s->init_num;
2073
2074                 /* do the header */
2075                 *(p++)=SSL3_MT_SERVER_DONE;
2076                 *(p++)=0;
2077                 *(p++)=0;
2078                 *(p++)=0;
2079                 s->init_num += 4;
2080 #endif
2081
2082                 s->state = SSL3_ST_SW_CERT_REQ_B;
2083                 }
2084
2085         /* SSL3_ST_SW_CERT_REQ_B */
2086         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2087 err:
2088         return(-1);
2089         }
2090
2091 int ssl3_get_client_key_exchange(SSL *s)
2092         {
2093         int i,al,ok;
2094         long n;
2095         unsigned long alg_k;
2096         unsigned char *p;
2097 #ifndef OPENSSL_NO_RSA
2098         RSA *rsa=NULL;
2099         EVP_PKEY *pkey=NULL;
2100 #endif
2101 #ifndef OPENSSL_NO_DH
2102         BIGNUM *pub=NULL;
2103         DH *dh_srvr;
2104 #endif
2105 #ifndef OPENSSL_NO_KRB5
2106         KSSL_ERR kssl_err;
2107 #endif /* OPENSSL_NO_KRB5 */
2108
2109 #ifndef OPENSSL_NO_ECDH
2110         EC_KEY *srvr_ecdh = NULL;
2111         EVP_PKEY *clnt_pub_pkey = NULL;
2112         EC_POINT *clnt_ecpoint = NULL;
2113         BN_CTX *bn_ctx = NULL; 
2114 #endif
2115
2116         n=s->method->ssl_get_message(s,
2117                 SSL3_ST_SR_KEY_EXCH_A,
2118                 SSL3_ST_SR_KEY_EXCH_B,
2119                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2120                 2048, /* ??? */
2121                 &ok);
2122
2123         if (!ok) return((int)n);
2124         p=(unsigned char *)s->init_msg;
2125
2126         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2127
2128 #ifndef OPENSSL_NO_RSA
2129         if (alg_k & SSL_kRSA)
2130                 {
2131                 /* FIX THIS UP EAY EAY EAY EAY */
2132                 if (s->s3->tmp.use_rsa_tmp)
2133                         {
2134                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2135                                 rsa=s->cert->rsa_tmp;
2136                         /* Don't do a callback because rsa_tmp should
2137                          * be sent already */
2138                         if (rsa == NULL)
2139                                 {
2140                                 al=SSL_AD_HANDSHAKE_FAILURE;
2141                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2142                                 goto f_err;
2143
2144                                 }
2145                         }
2146                 else
2147                         {
2148                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2149                         if (    (pkey == NULL) ||
2150                                 (pkey->type != EVP_PKEY_RSA) ||
2151                                 (pkey->pkey.rsa == NULL))
2152                                 {
2153                                 al=SSL_AD_HANDSHAKE_FAILURE;
2154                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2155                                 goto f_err;
2156                                 }
2157                         rsa=pkey->pkey.rsa;
2158                         }
2159
2160                 /* TLS and [incidentally] DTLS{0xFEFF} */
2161                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2162                         {
2163                         n2s(p,i);
2164                         if (n != i+2)
2165                                 {
2166                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2167                                         {
2168                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2169                                         goto err;
2170                                         }
2171                                 else
2172                                         p-=2;
2173                                 }
2174                         else
2175                                 n=i;
2176                         }
2177
2178                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2179
2180                 al = -1;
2181                 
2182                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2183                         {
2184                         al=SSL_AD_DECODE_ERROR;
2185                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2186                         }
2187
2188                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2189                         {
2190                         /* The premaster secret must contain the same version number as the
2191                          * ClientHello to detect version rollback attacks (strangely, the
2192                          * protocol does not offer such protection for DH ciphersuites).
2193                          * However, buggy clients exist that send the negotiated protocol
2194                          * version instead if the server does not support the requested
2195                          * protocol version.
2196                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2197                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2198                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2199                                 {
2200                                 al=SSL_AD_DECODE_ERROR;
2201                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2202
2203                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2204                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2205                                  * number check as a "bad version oracle" -- an alert would
2206                                  * reveal that the plaintext corresponding to some ciphertext
2207                                  * made up by the adversary is properly formatted except
2208                                  * that the version number is wrong.  To avoid such attacks,
2209                                  * we should treat this just like any other decryption error. */
2210                                 }
2211                         }
2212
2213                 if (al != -1)
2214                         {
2215                         /* Some decryption failure -- use random value instead as countermeasure
2216                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2217                          * (see RFC 2246, section 7.4.7.1). */
2218                         ERR_clear_error();
2219                         i = SSL_MAX_MASTER_KEY_LENGTH;
2220                         p[0] = s->client_version >> 8;
2221                         p[1] = s->client_version & 0xff;
2222                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2223                                 goto err;
2224                         }
2225         
2226                 s->session->master_key_length=
2227                         s->method->ssl3_enc->generate_master_secret(s,
2228                                 s->session->master_key,
2229                                 p,i);
2230                 OPENSSL_cleanse(p,i);
2231                 }
2232         else
2233 #endif
2234 #ifndef OPENSSL_NO_DH
2235                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2236                 {
2237                 n2s(p,i);
2238                 if (n != i+2)
2239                         {
2240                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2241                                 {
2242                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2243                                 goto err;
2244                                 }
2245                         else
2246                                 {
2247                                 p-=2;
2248                                 i=(int)n;
2249                                 }
2250                         }
2251
2252                 if (n == 0L) /* the parameters are in the cert */
2253                         {
2254                         al=SSL_AD_HANDSHAKE_FAILURE;
2255                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2256                         goto f_err;
2257                         }
2258                 else
2259                         {
2260                         if (s->s3->tmp.dh == NULL)
2261                                 {
2262                                 al=SSL_AD_HANDSHAKE_FAILURE;
2263                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2264                                 goto f_err;
2265                                 }
2266                         else
2267                                 dh_srvr=s->s3->tmp.dh;
2268                         }
2269
2270                 pub=BN_bin2bn(p,i,NULL);
2271                 if (pub == NULL)
2272                         {
2273                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2274                         goto err;
2275                         }
2276
2277                 i=DH_compute_key(p,pub,dh_srvr);
2278
2279                 if (i <= 0)
2280                         {
2281                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2282                         goto err;
2283                         }
2284
2285                 DH_free(s->s3->tmp.dh);
2286                 s->s3->tmp.dh=NULL;
2287
2288                 BN_clear_free(pub);
2289                 pub=NULL;
2290                 s->session->master_key_length=
2291                         s->method->ssl3_enc->generate_master_secret(s,
2292                                 s->session->master_key,p,i);
2293                 OPENSSL_cleanse(p,i);
2294                 }
2295         else
2296 #endif
2297 #ifndef OPENSSL_NO_KRB5
2298         if (alg_k & SSL_kKRB5)
2299                 {
2300                 krb5_error_code         krb5rc;
2301                 krb5_data               enc_ticket;
2302                 krb5_data               authenticator;
2303                 krb5_data               enc_pms;
2304                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2305                 EVP_CIPHER_CTX          ciph_ctx;
2306                 const EVP_CIPHER        *enc = NULL;
2307                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2308                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2309                                                + EVP_MAX_BLOCK_LENGTH];
2310                 int                  padl, outl;
2311                 krb5_timestamp          authtime = 0;
2312                 krb5_ticket_times       ttimes;
2313
2314                 EVP_CIPHER_CTX_init(&ciph_ctx);
2315
2316                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2317
2318                 n2s(p,i);
2319                 enc_ticket.length = i;
2320
2321                 if (n < (long)(enc_ticket.length + 6))
2322                         {
2323                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2324                                 SSL_R_DATA_LENGTH_TOO_LONG);
2325                         goto err;
2326                         }
2327
2328                 enc_ticket.data = (char *)p;
2329                 p+=enc_ticket.length;
2330
2331                 n2s(p,i);
2332                 authenticator.length = i;
2333
2334                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2335                         {
2336                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2337                                 SSL_R_DATA_LENGTH_TOO_LONG);
2338                         goto err;
2339                         }
2340
2341                 authenticator.data = (char *)p;
2342                 p+=authenticator.length;
2343
2344                 n2s(p,i);
2345                 enc_pms.length = i;
2346                 enc_pms.data = (char *)p;
2347                 p+=enc_pms.length;
2348
2349                 /* Note that the length is checked again below,
2350                 ** after decryption
2351                 */
2352                 if(enc_pms.length > sizeof pms)
2353                         {
2354                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2355                                SSL_R_DATA_LENGTH_TOO_LONG);
2356                         goto err;
2357                         }
2358
2359                 if (n != (long)(enc_ticket.length + authenticator.length +
2360                                                 enc_pms.length + 6))
2361                         {
2362                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2363                                 SSL_R_DATA_LENGTH_TOO_LONG);
2364                         goto err;
2365                         }
2366
2367                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2368                                         &kssl_err)) != 0)
2369                         {
2370 #ifdef KSSL_DEBUG
2371                         printf("kssl_sget_tkt rtn %d [%d]\n",
2372                                 krb5rc, kssl_err.reason);
2373                         if (kssl_err.text)
2374                                 printf("kssl_err text= %s\n", kssl_err.text);
2375 #endif  /* KSSL_DEBUG */
2376                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2377                                 kssl_err.reason);
2378                         goto err;
2379                         }
2380
2381                 /*  Note: no authenticator is not considered an error,
2382                 **  but will return authtime == 0.
2383                 */
2384                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2385                                         &authtime, &kssl_err)) != 0)
2386                         {
2387 #ifdef KSSL_DEBUG
2388                         printf("kssl_check_authent rtn %d [%d]\n",
2389                                 krb5rc, kssl_err.reason);
2390                         if (kssl_err.text)
2391                                 printf("kssl_err text= %s\n", kssl_err.text);
2392 #endif  /* KSSL_DEBUG */
2393                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2394                                 kssl_err.reason);
2395                         goto err;
2396                         }
2397
2398                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2399                         {
2400                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2401                         goto err;
2402                         }
2403
2404 #ifdef KSSL_DEBUG
2405                 kssl_ctx_show(kssl_ctx);
2406 #endif  /* KSSL_DEBUG */
2407
2408                 enc = kssl_map_enc(kssl_ctx->enctype);
2409                 if (enc == NULL)
2410                     goto err;
2411
2412                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2413
2414                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2415                         {
2416                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2417                                 SSL_R_DECRYPTION_FAILED);
2418                         goto err;
2419                         }
2420                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2421                                         (unsigned char *)enc_pms.data, enc_pms.length))
2422                         {
2423                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2424                                 SSL_R_DECRYPTION_FAILED);
2425                         goto err;
2426                         }
2427                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2428                         {
2429                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2430                                 SSL_R_DATA_LENGTH_TOO_LONG);
2431                         goto err;
2432                         }
2433                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2434                         {
2435                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2436                                 SSL_R_DECRYPTION_FAILED);
2437                         goto err;
2438                         }
2439                 outl += padl;
2440                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2441                         {
2442                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2443                                 SSL_R_DATA_LENGTH_TOO_LONG);
2444                         goto err;
2445                         }
2446                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2447                     {
2448                     /* The premaster secret must contain the same version number as the
2449                      * ClientHello to detect version rollback attacks (strangely, the
2450                      * protocol does not offer such protection for DH ciphersuites).
2451                      * However, buggy clients exist that send random bytes instead of
2452                      * the protocol version.
2453                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2454                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2455                      */
2456                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2457                         {
2458                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2459                                SSL_AD_DECODE_ERROR);
2460                         goto err;
2461                         }
2462                     }
2463
2464                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2465
2466                 s->session->master_key_length=
2467                         s->method->ssl3_enc->generate_master_secret(s,
2468                                 s->session->master_key, pms, outl);
2469
2470                 if (kssl_ctx->client_princ)
2471                         {
2472                         size_t len = strlen(kssl_ctx->client_princ);
2473                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2474                                 {
2475                                 s->session->krb5_client_princ_len = len;
2476                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2477                                 }
2478                         }
2479
2480
2481                 /*  Was doing kssl_ctx_free() here,
2482                 **  but it caused problems for apache.
2483                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2484                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2485                 */
2486                 }
2487         else
2488 #endif  /* OPENSSL_NO_KRB5 */
2489
2490 #ifndef OPENSSL_NO_ECDH
2491                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2492                 {
2493                 int ret = 1;
2494                 int field_size = 0;
2495                 const EC_KEY   *tkey;
2496                 const EC_GROUP *group;
2497                 const BIGNUM *priv_key;
2498
2499                 /* initialize structures for server's ECDH key pair */
2500                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2501                         {
2502                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2503                             ERR_R_MALLOC_FAILURE);
2504                         goto err;
2505                         }
2506
2507                 /* Let's get server private key and group information */
2508                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2509                         { 
2510                         /* use the certificate */
2511                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2512                         }
2513                 else
2514                         {
2515                         /* use the ephermeral values we saved when
2516                          * generating the ServerKeyExchange msg.
2517                          */
2518                         tkey = s->s3->tmp.ecdh;
2519                         }
2520
2521                 group    = EC_KEY_get0_group(tkey);
2522                 priv_key = EC_KEY_get0_private_key(tkey);
2523
2524                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2525                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2526                         {
2527                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2528                                ERR_R_EC_LIB);
2529                         goto err;
2530                         }
2531
2532                 /* Let's get client's public key */
2533                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2534                         {
2535                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2536                             ERR_R_MALLOC_FAILURE);
2537                         goto err;
2538                         }
2539
2540                 if (n == 0L) 
2541                         {
2542                         /* Client Publickey was in Client Certificate */
2543
2544                          if (alg_k & SSL_kEECDH)
2545                                  {
2546                                  al=SSL_AD_HANDSHAKE_FAILURE;
2547                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2548                                  goto f_err;
2549                                  }
2550                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2551                             == NULL) || 
2552                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2553                                 {
2554                                 /* XXX: For now, we do not support client
2555                                  * authentication using ECDH certificates
2556                                  * so this branch (n == 0L) of the code is
2557                                  * never executed. When that support is
2558                                  * added, we ought to ensure the key 
2559                                  * received in the certificate is 
2560                                  * authorized for key agreement.
2561                                  * ECDH_compute_key implicitly checks that
2562                                  * the two ECDH shares are for the same
2563                                  * group.
2564                                  */
2565                                 al=SSL_AD_HANDSHAKE_FAILURE;
2566                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2567                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2568                                 goto f_err;
2569                                 }
2570
2571                         if (EC_POINT_copy(clnt_ecpoint,
2572                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2573                                 {
2574                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2575                                         ERR_R_EC_LIB);
2576                                 goto err;
2577                                 }
2578                         ret = 2; /* Skip certificate verify processing */
2579                         }
2580                 else
2581                         {
2582                         /* Get client's public key from encoded point
2583                          * in the ClientKeyExchange message.
2584                          */
2585                         if ((bn_ctx = BN_CTX_new()) == NULL)
2586                                 {
2587                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2588                                     ERR_R_MALLOC_FAILURE);
2589                                 goto err;
2590                                 }
2591
2592                         /* Get encoded point length */
2593                         i = *p; 
2594                         p += 1;
2595                         if (n != 1 + i)
2596                                 {
2597                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2598                                     ERR_R_EC_LIB);
2599                                 goto err;
2600                                 }
2601                         if (EC_POINT_oct2point(group, 
2602                             clnt_ecpoint, p, i, bn_ctx) == 0)
2603                                 {
2604                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2605                                     ERR_R_EC_LIB);
2606                                 goto err;
2607                                 }
2608                         /* p is pointing to somewhere in the buffer
2609                          * currently, so set it to the start 
2610                          */ 
2611                         p=(unsigned char *)s->init_buf->data;
2612                         }
2613
2614                 /* Compute the shared pre-master secret */
2615                 field_size = EC_GROUP_get_degree(group);
2616                 if (field_size <= 0)
2617                         {
2618                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2619                                ERR_R_ECDH_LIB);
2620                         goto err;
2621                         }
2622                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2623                 if (i <= 0)
2624                         {
2625                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2626                             ERR_R_ECDH_LIB);
2627                         goto err;
2628                         }
2629
2630                 EVP_PKEY_free(clnt_pub_pkey);
2631                 EC_POINT_free(clnt_ecpoint);
2632                 EC_KEY_free(srvr_ecdh);
2633                 BN_CTX_free(bn_ctx);
2634                 EC_KEY_free(s->s3->tmp.ecdh);
2635                 s->s3->tmp.ecdh = NULL; 
2636
2637                 /* Compute the master secret */
2638                 s->session->master_key_length = s->method->ssl3_enc-> \
2639                     generate_master_secret(s, s->session->master_key, p, i);
2640                 
2641                 OPENSSL_cleanse(p, i);
2642                 return (ret);
2643                 }
2644         else
2645 #endif
2646 #ifndef OPENSSL_NO_PSK
2647                 if (alg_k & SSL_kPSK)
2648                         {
2649                         unsigned char *t = NULL;
2650                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2651                         unsigned int pre_ms_len = 0, psk_len = 0;
2652                         int psk_err = 1;
2653                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2654
2655                         al=SSL_AD_HANDSHAKE_FAILURE;
2656
2657                         n2s(p,i);
2658                         if (n != i+2)
2659                                 {
2660                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2661                                         SSL_R_LENGTH_MISMATCH);
2662                                 goto psk_err;
2663                                 }
2664                         if (i > PSK_MAX_IDENTITY_LEN)
2665                                 {
2666                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2667                                         SSL_R_DATA_LENGTH_TOO_LONG);
2668                                 goto psk_err;
2669                                 }
2670                         if (s->psk_server_callback == NULL)
2671                                 {
2672                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2673                                        SSL_R_PSK_NO_SERVER_CB);
2674                                 goto psk_err;
2675                                 }
2676
2677                         /* Create guaranteed NULL-terminated identity
2678                          * string for the callback */
2679                         memcpy(tmp_id, p, i);
2680                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2681                         psk_len = s->psk_server_callback(s, tmp_id,
2682                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2683                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2684
2685                         if (psk_len > PSK_MAX_PSK_LEN)
2686                                 {
2687                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2688                                         ERR_R_INTERNAL_ERROR);
2689                                 goto psk_err;
2690                                 }
2691                         else if (psk_len == 0)
2692                                 {
2693                                 /* PSK related to the given identity not found */
2694                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2695                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2696                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2697                                 goto psk_err;
2698                                 }
2699
2700                         /* create PSK pre_master_secret */
2701                         pre_ms_len=2+psk_len+2+psk_len;
2702                         t = psk_or_pre_ms;
2703                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2704                         s2n(psk_len, t);
2705                         memset(t, 0, psk_len);
2706                         t+=psk_len;
2707                         s2n(psk_len, t);
2708
2709                         if (s->session->psk_identity != NULL)
2710                                 OPENSSL_free(s->session->psk_identity);
2711                         s->session->psk_identity = BUF_strdup((char *)p);
2712                         if (s->session->psk_identity == NULL)
2713                                 {
2714                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2715                                         ERR_R_MALLOC_FAILURE);
2716                                 goto psk_err;
2717                                 }
2718
2719                         if (s->session->psk_identity_hint != NULL)
2720                                 OPENSSL_free(s->session->psk_identity_hint);
2721                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2722                         if (s->ctx->psk_identity_hint != NULL &&
2723                                 s->session->psk_identity_hint == NULL)
2724                                 {
2725                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2726                                         ERR_R_MALLOC_FAILURE);
2727                                 goto psk_err;
2728                                 }
2729
2730                         s->session->master_key_length=
2731                                 s->method->ssl3_enc->generate_master_secret(s,
2732                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2733                         psk_err = 0;
2734                 psk_err:
2735                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2736                         if (psk_err != 0)
2737                                 goto f_err;
2738                         }
2739                 else
2740 #endif
2741 #ifndef OPENSSL_NO_SRP
2742                 if (alg_k & SSL_kSRP)
2743                         {
2744                         int param_len;
2745
2746                         n2s(p,i);
2747                         param_len=i+2;
2748                         if (param_len > n)
2749                                 {
2750                                 al=SSL_AD_DECODE_ERROR;
2751                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2752                                 goto f_err;
2753                                 }
2754                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2755                                 {
2756                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2757                                 goto err;
2758                                 }
2759                         if (s->session->srp_username != NULL)
2760                                 OPENSSL_free(s->session->srp_username);
2761                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2762                         if (s->session->srp_username == NULL)
2763                                 {
2764                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2765                                         ERR_R_MALLOC_FAILURE);
2766                                 goto err;
2767                                 }
2768
2769                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2770                                 {
2771                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2772                                 goto err;
2773                                 }
2774
2775                         p+=i;
2776                         }
2777                 else
2778 #endif  /* OPENSSL_NO_SRP */
2779                 if (alg_k & SSL_kGOST) 
2780                         {
2781                         int ret = 0;
2782                         EVP_PKEY_CTX *pkey_ctx;
2783                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2784                         unsigned char premaster_secret[32], *start;
2785                         size_t outlen=32, inlen;
2786                         unsigned long alg_a;
2787
2788                         /* Get our certificate private key*/
2789                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2790                         if (alg_a & SSL_aGOST94)
2791                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2792                         else if (alg_a & SSL_aGOST01)
2793                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2794
2795                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2796                         EVP_PKEY_decrypt_init(pkey_ctx);
2797                         /* If client certificate is present and is of the same type, maybe
2798                          * use it for key exchange.  Don't mind errors from
2799                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2800                          * a client certificate for authorization only. */
2801                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2802                         if (client_pub_pkey)
2803                                 {
2804                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2805                                         ERR_clear_error();
2806                                 }
2807                         /* Decrypt session key */
2808                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2809                                 {
2810                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2811                                 goto gerr;
2812                                 }
2813                         if (p[1] == 0x81)
2814                                 {
2815                                 start = p+3;
2816                                 inlen = p[2];
2817                                 }
2818                         else if (p[1] < 0x80)
2819                                 {
2820                                 start = p+2;
2821                                 inlen = p[1];
2822                                 }
2823                         else
2824                                 {
2825                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2826                                 goto gerr;
2827                                 }
2828                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2829
2830                                 {
2831                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2832                                 goto gerr;
2833                                 }
2834                         /* Generate master secret */
2835                         s->session->master_key_length=
2836                                 s->method->ssl3_enc->generate_master_secret(s,
2837                                         s->session->master_key,premaster_secret,32);
2838                         /* Check if pubkey from client certificate was used */
2839                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2840                                 ret = 2;
2841                         else
2842                                 ret = 1;
2843                 gerr:
2844                         EVP_PKEY_free(client_pub_pkey);
2845                         EVP_PKEY_CTX_free(pkey_ctx);
2846                         if (ret)
2847                                 return ret;
2848                         else
2849                                 goto err;
2850                         }
2851                 else
2852                 {
2853                 al=SSL_AD_HANDSHAKE_FAILURE;
2854                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2855                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2856                 goto f_err;
2857                 }
2858
2859         return(1);
2860 f_err:
2861         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2862 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2863 err:
2864 #endif
2865 #ifndef OPENSSL_NO_ECDH
2866         EVP_PKEY_free(clnt_pub_pkey);
2867         EC_POINT_free(clnt_ecpoint);
2868         if (srvr_ecdh != NULL) 
2869                 EC_KEY_free(srvr_ecdh);
2870         BN_CTX_free(bn_ctx);
2871 #endif
2872         return(-1);
2873         }
2874
2875 int ssl3_get_cert_verify(SSL *s)
2876         {
2877         EVP_PKEY *pkey=NULL;
2878         unsigned char *p;
2879         int al,ok,ret=0;
2880         long n;
2881         int type=0,i,j;
2882         X509 *peer;
2883         const EVP_MD *md = NULL;
2884         EVP_MD_CTX mctx;
2885         EVP_MD_CTX_init(&mctx);
2886
2887         n=s->method->ssl_get_message(s,
2888                 SSL3_ST_SR_CERT_VRFY_A,
2889                 SSL3_ST_SR_CERT_VRFY_B,
2890                 -1,
2891                 514, /* 514? */
2892                 &ok);
2893
2894         if (!ok) return((int)n);
2895
2896         if (s->session->peer != NULL)
2897                 {
2898                 peer=s->session->peer;
2899                 pkey=X509_get_pubkey(peer);
2900                 type=X509_certificate_type(peer,pkey);
2901                 }
2902         else
2903                 {
2904                 peer=NULL;
2905                 pkey=NULL;
2906                 }
2907
2908         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2909                 {
2910                 s->s3->tmp.reuse_message=1;
2911                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2912                         {
2913                         al=SSL_AD_UNEXPECTED_MESSAGE;
2914                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2915                         goto f_err;
2916                         }
2917                 ret=1;
2918                 goto end;
2919                 }
2920
2921         if (peer == NULL)
2922                 {
2923                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2924                 al=SSL_AD_UNEXPECTED_MESSAGE;
2925                 goto f_err;
2926                 }
2927
2928         if (!(type & EVP_PKT_SIGN))
2929                 {
2930                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2931                 al=SSL_AD_ILLEGAL_PARAMETER;
2932                 goto f_err;
2933                 }
2934
2935         if (s->s3->change_cipher_spec)
2936                 {
2937                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2938                 al=SSL_AD_UNEXPECTED_MESSAGE;
2939                 goto f_err;
2940                 }
2941
2942         /* we now have a signature that we need to verify */
2943         p=(unsigned char *)s->init_msg;
2944         /* Check for broken implementations of GOST ciphersuites */
2945         /* If key is GOST and n is exactly 64, it is bare
2946          * signature without length field */
2947         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2948                 pkey->type == NID_id_GostR3410_2001) )
2949                 {