use TLS1_get_version macro to check version so TLS v1.2 changes don't interfere with...
[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 *ad)
185         {
186         int ret = SSL_ERROR_NONE;
187
188         *ad = 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                         /* There isn't any srp login extension !!! */
196                         ret = SSL3_AL_WARNING;
197                         *ad = SSL_AD_MISSING_SRP_USERNAME;
198                         }
199                 else
200                         {
201                         ret = SSL_srp_server_param_with_username(s,ad);
202                         }
203                 }
204         return ret;
205         }
206 #endif
207
208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
209                         ssl3_accept,
210                         ssl_undefined_function,
211                         ssl3_get_server_method)
212
213 int ssl3_accept(SSL *s)
214         {
215         BUF_MEM *buf;
216         unsigned long alg_k,Time=(unsigned long)time(NULL);
217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
218         int ret= -1;
219         int new_state,state,skip=0;
220 #ifndef OPENSSL_NO_SRP
221         int srp_no_username =0;
222 #endif
223
224         RAND_add(&Time,sizeof(Time),0);
225         ERR_clear_error();
226         clear_sys_error();
227
228         if (s->info_callback != NULL)
229                 cb=s->info_callback;
230         else if (s->ctx->info_callback != NULL)
231                 cb=s->ctx->info_callback;
232
233         /* init things to blank */
234         s->in_handshake++;
235         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
236
237         if (s->cert == NULL)
238                 {
239                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
240                 return(-1);
241                 }
242
243         for (;;)
244                 {
245                 state=s->state;
246
247                 switch (s->state)
248                         {
249                 case SSL_ST_RENEGOTIATE:
250                         s->renegotiate=1;
251                         /* s->state=SSL_ST_ACCEPT; */
252
253                 case SSL_ST_BEFORE:
254                 case SSL_ST_ACCEPT:
255                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
256                 case SSL_ST_OK|SSL_ST_ACCEPT:
257
258                         s->server=1;
259                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
260
261                         if ((s->version>>8) != 3)
262                                 {
263                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
264                                 return -1;
265                                 }
266                         s->type=SSL_ST_ACCEPT;
267
268                         if (s->init_buf == NULL)
269                                 {
270                                 if ((buf=BUF_MEM_new()) == NULL)
271                                         {
272                                         ret= -1;
273                                         goto end;
274                                         }
275                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
276                                         {
277                                         ret= -1;
278                                         goto end;
279                                         }
280                                 s->init_buf=buf;
281                                 }
282
283                         if (!ssl3_setup_buffers(s))
284                                 {
285                                 ret= -1;
286                                 goto end;
287                                 }
288
289                         s->init_num=0;
290
291                         if (s->state != SSL_ST_RENEGOTIATE)
292                                 {
293                                 /* Ok, we now need to push on a buffering BIO so that
294                                  * the output is sent in a way that TCP likes :-)
295                                  */
296                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
297                                 
298                                 ssl3_init_finished_mac(s);
299                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
300                                 s->ctx->stats.sess_accept++;
301                                 }
302                         else if (!s->s3->send_connection_binding &&
303                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
304                                 {
305                                 /* Server attempting to renegotiate with
306                                  * client that doesn't support secure
307                                  * renegotiation.
308                                  */
309                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
310                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
311                                 ret = -1;
312                                 goto end;
313                                 }
314                         else
315                                 {
316                                 /* s->state == SSL_ST_RENEGOTIATE,
317                                  * we will just send a HelloRequest */
318                                 s->ctx->stats.sess_accept_renegotiate++;
319                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
320                                 }
321                         break;
322
323                 case SSL3_ST_SW_HELLO_REQ_A:
324                 case SSL3_ST_SW_HELLO_REQ_B:
325
326                         s->shutdown=0;
327                         ret=ssl3_send_hello_request(s);
328                         if (ret <= 0) goto end;
329                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
330                         s->state=SSL3_ST_SW_FLUSH;
331                         s->init_num=0;
332
333                         ssl3_init_finished_mac(s);
334                         break;
335
336                 case SSL3_ST_SW_HELLO_REQ_C:
337                         s->state=SSL_ST_OK;
338                         break;
339
340                 case SSL3_ST_SR_CLNT_HELLO_A:
341                 case SSL3_ST_SR_CLNT_HELLO_B:
342                 case SSL3_ST_SR_CLNT_HELLO_C:
343 #ifndef OPENSSL_NO_SRP
344                 case SSL3_ST_SR_CLNT_HELLO_SRP_USERNAME:
345 #endif
346
347                         s->shutdown=0;
348                         ret=ssl3_get_client_hello(s);
349                         if (ret <= 0) goto end;
350 #ifndef OPENSSL_NO_SRP
351                         {
352                         int extension_error = 0,al;
353
354                         if ((al = SSL_check_srp_ext_ClientHello(s,&extension_error)) != SSL_ERROR_NONE)
355                                 {
356                                 ssl3_send_alert(s,al,extension_error);
357                                 if (extension_error == SSL_AD_MISSING_SRP_USERNAME)
358                                         {
359                                         if (srp_no_username) goto end;
360                                         ERR_clear_error();
361                                         srp_no_username = 1;
362                                         s->state=SSL3_ST_SR_CLNT_HELLO_SRP_USERNAME;
363                                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
364                                         if ((ret=BIO_flush(s->wbio)) <= 0) goto end;
365                                         s->init_num=0;
366                                         break;
367                                         }
368                                 ret = -1;
369                                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
370                                 goto end;
371                                 }
372                         }
373 #endif
374                         
375                         s->renegotiate = 2;
376                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
377                         s->init_num=0;
378                         break;
379
380                 case SSL3_ST_SW_SRVR_HELLO_A:
381                 case SSL3_ST_SW_SRVR_HELLO_B:
382                         ret=ssl3_send_server_hello(s);
383                         if (ret <= 0) goto end;
384 #ifndef OPENSSL_NO_TLSEXT
385                         if (s->hit)
386                                 {
387                                 if (s->tlsext_ticket_expected)
388                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
389                                 else
390                                         s->state=SSL3_ST_SW_CHANGE_A;
391                                 }
392 #else
393                         if (s->hit)
394                                         s->state=SSL3_ST_SW_CHANGE_A;
395 #endif
396                         else
397                                 s->state=SSL3_ST_SW_CERT_A;
398                         s->init_num=0;
399                         break;
400
401                 case SSL3_ST_SW_CERT_A:
402                 case SSL3_ST_SW_CERT_B:
403                         /* Check if it is anon DH or anon ECDH, */
404                         /* normal PSK or KRB5 or SRP */
405                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
406                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
407                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
408                                 {
409                                 ret=ssl3_send_server_certificate(s);
410                                 if (ret <= 0) goto end;
411 #ifndef OPENSSL_NO_TLSEXT
412                                 if (s->tlsext_status_expected)
413                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
414                                 else
415                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
416                                 }
417                         else
418                                 {
419                                 skip = 1;
420                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
421                                 }
422 #else
423                                 }
424                         else
425                                 skip=1;
426
427                         s->state=SSL3_ST_SW_KEY_EXCH_A;
428 #endif
429                         s->init_num=0;
430                         break;
431
432                 case SSL3_ST_SW_KEY_EXCH_A:
433                 case SSL3_ST_SW_KEY_EXCH_B:
434                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
435
436                         /* clear this, it may get reset by
437                          * send_server_key_exchange */
438                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
439 #ifndef OPENSSL_NO_KRB5
440                                 && !(alg_k & SSL_kKRB5)
441 #endif /* OPENSSL_NO_KRB5 */
442                                 )
443                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
444                                  * even when forbidden by protocol specs
445                                  * (handshake may fail as clients are not required to
446                                  * be able to handle this) */
447                                 s->s3->tmp.use_rsa_tmp=1;
448                         else
449                                 s->s3->tmp.use_rsa_tmp=0;
450
451
452                         /* only send if a DH key exchange, fortezza or
453                          * RSA but we have a sign only certificate
454                          *
455                          * PSK: may send PSK identity hints
456                          *
457                          * For ECC ciphersuites, we send a serverKeyExchange
458                          * message only if the cipher suite is either
459                          * ECDH-anon or ECDHE. In other cases, the
460                          * server certificate contains the server's
461                          * public key for key exchange.
462                          */
463                         if (s->s3->tmp.use_rsa_tmp
464                         /* PSK: send ServerKeyExchange if PSK identity
465                          * hint if provided */
466 #ifndef OPENSSL_NO_PSK
467                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
468 #endif
469 #ifndef OPENSSL_NO_SRP
470                             /* SRP: send ServerKeyExchange */
471                             || (alg_k & SSL_kSRP)
472 #endif
473                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
474                             || (alg_k & SSL_kEECDH)
475                             || ((alg_k & SSL_kRSA)
476                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
477                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
478                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
479                                         )
480                                     )
481                                 )
482                             )
483                                 {
484                                 ret=ssl3_send_server_key_exchange(s);
485                                 if (ret <= 0) goto end;
486                                 }
487                         else
488                                 skip=1;
489
490                         s->state=SSL3_ST_SW_CERT_REQ_A;
491                         s->init_num=0;
492                         break;
493
494                 case SSL3_ST_SW_CERT_REQ_A:
495                 case SSL3_ST_SW_CERT_REQ_B:
496                         if (/* don't request cert unless asked for it: */
497                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
498                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
499                                  * don't request cert during re-negotiation: */
500                                 ((s->session->peer != NULL) &&
501                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
502                                 /* never request cert in anonymous ciphersuites
503                                  * (see section "Certificate request" in SSL 3 drafts
504                                  * and in RFC 2246): */
505                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
506                                  /* ... except when the application insists on verification
507                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
508                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
509                                  /* never request cert in Kerberos ciphersuites */
510                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
511                                 /* With normal PSK Certificates and
512                                  * Certificate Requests are omitted */
513                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
514                                 {
515                                 /* no cert request */
516                                 skip=1;
517                                 s->s3->tmp.cert_request=0;
518                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
519                                 if (s->s3->handshake_buffer)
520                                         if (!ssl3_digest_cached_records(s))
521                                                 return -1;
522                                 }
523                         else
524                                 {
525                                 s->s3->tmp.cert_request=1;
526                                 ret=ssl3_send_certificate_request(s);
527                                 if (ret <= 0) goto end;
528 #ifndef NETSCAPE_HANG_BUG
529                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
530 #else
531                                 s->state=SSL3_ST_SW_FLUSH;
532                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
533 #endif
534                                 s->init_num=0;
535                                 }
536                         break;
537
538                 case SSL3_ST_SW_SRVR_DONE_A:
539                 case SSL3_ST_SW_SRVR_DONE_B:
540                         ret=ssl3_send_server_done(s);
541                         if (ret <= 0) goto end;
542                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
543                         s->state=SSL3_ST_SW_FLUSH;
544                         s->init_num=0;
545                         break;
546                 
547                 case SSL3_ST_SW_FLUSH:
548
549                         /* This code originally checked to see if
550                          * any data was pending using BIO_CTRL_INFO
551                          * and then flushed. This caused problems
552                          * as documented in PR#1939. The proposed
553                          * fix doesn't completely resolve this issue
554                          * as buggy implementations of BIO_CTRL_PENDING
555                          * still exist. So instead we just flush
556                          * unconditionally.
557                          */
558
559                         s->rwstate=SSL_WRITING;
560                         if (BIO_flush(s->wbio) <= 0)
561                                 {
562                                 ret= -1;
563                                 goto end;
564                                 }
565                         s->rwstate=SSL_NOTHING;
566
567                         s->state=s->s3->tmp.next_state;
568                         break;
569
570                 case SSL3_ST_SR_CERT_A:
571                 case SSL3_ST_SR_CERT_B:
572                         /* Check for second client hello (MS SGC) */
573                         ret = ssl3_check_client_hello(s);
574                         if (ret <= 0)
575                                 goto end;
576                         if (ret == 2)
577                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
578                         else {
579                                 if (s->s3->tmp.cert_request)
580                                         {
581                                         ret=ssl3_get_client_certificate(s);
582                                         if (ret <= 0) goto end;
583                                         }
584                                 s->init_num=0;
585                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
586                         }
587                         break;
588
589                 case SSL3_ST_SR_KEY_EXCH_A:
590                 case SSL3_ST_SR_KEY_EXCH_B:
591                         ret=ssl3_get_client_key_exchange(s);
592                         if (ret <= 0)
593                                 goto end;
594                         if (ret == 2)
595                                 {
596                                 /* For the ECDH ciphersuites when
597                                  * the client sends its ECDH pub key in
598                                  * a certificate, the CertificateVerify
599                                  * message is not sent.
600                                  * Also for GOST ciphersuites when
601                                  * the client uses its key from the certificate
602                                  * for key exchange.
603                                  */
604 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
605                                 s->state=SSL3_ST_SR_FINISHED_A;
606 #else
607                                 if (s->s3->next_proto_neg_seen)
608                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
609                                 else
610                                         s->state=SSL3_ST_SR_FINISHED_A;
611 #endif
612                                 s->init_num = 0;
613                                 }
614                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
615                                 {
616                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
617                                 s->init_num=0;
618                                 if (!s->session->peer)
619                                         break;
620                                 /* For TLS v1.2 freeze the handshake buffer
621                                  * at this point and digest cached records.
622                                  */
623                                 if (!s->s3->handshake_buffer)
624                                         {
625                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
626                                         return -1;
627                                         }
628                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
629                                 if (!ssl3_digest_cached_records(s))
630                                         return -1;
631                                 }
632                         else
633                                 {
634                                 int offset=0;
635                                 int dgst_num;
636
637                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
638                                 s->init_num=0;
639
640                                 /* We need to get hashes here so if there is
641                                  * a client cert, it can be verified
642                                  * FIXME - digest processing for CertificateVerify
643                                  * should be generalized. But it is next step
644                                  */
645                                 if (s->s3->handshake_buffer)
646                                         if (!ssl3_digest_cached_records(s))
647                                                 return -1;
648                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
649                                         if (s->s3->handshake_dgst[dgst_num]) 
650                                                 {
651                                                 int dgst_size;
652
653                                                 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]));
654                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
655                                                 if (dgst_size < 0)
656                                                         {
657                                                         ret = -1;
658                                                         goto end;
659                                                         }
660                                                 offset+=dgst_size;
661                                                 }               
662                                 }
663                         break;
664
665                 case SSL3_ST_SR_CERT_VRFY_A:
666                 case SSL3_ST_SR_CERT_VRFY_B:
667
668                         /* we should decide if we expected this one */
669                         ret=ssl3_get_cert_verify(s);
670                         if (ret <= 0) goto end;
671
672 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
673                         s->state=SSL3_ST_SR_FINISHED_A;
674 #else
675                         if (s->s3->next_proto_neg_seen)
676                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
677                         else
678                                 s->state=SSL3_ST_SR_FINISHED_A;
679 #endif
680                         s->init_num=0;
681                         break;
682
683 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
684                 case SSL3_ST_SR_NEXT_PROTO_A:
685                 case SSL3_ST_SR_NEXT_PROTO_B:
686                         ret=ssl3_get_next_proto(s);
687                         if (ret <= 0) goto end;
688                         s->init_num = 0;
689                         s->state=SSL3_ST_SR_FINISHED_A;
690                         break;
691 #endif
692
693                 case SSL3_ST_SR_FINISHED_A:
694                 case SSL3_ST_SR_FINISHED_B:
695                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
696                                 SSL3_ST_SR_FINISHED_B);
697                         if (ret <= 0) goto end;
698 #ifndef OPENSSL_NO_TLSEXT
699                         if (s->tlsext_ticket_expected)
700                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
701                         else if (s->hit)
702                                 s->state=SSL_ST_OK;
703 #else
704                         if (s->hit)
705                                 s->state=SSL_ST_OK;
706 #endif
707                         else
708                                 s->state=SSL3_ST_SW_CHANGE_A;
709                         s->init_num=0;
710                         break;
711
712 #ifndef OPENSSL_NO_TLSEXT
713                 case SSL3_ST_SW_SESSION_TICKET_A:
714                 case SSL3_ST_SW_SESSION_TICKET_B:
715                         ret=ssl3_send_newsession_ticket(s);
716                         if (ret <= 0) goto end;
717                         s->state=SSL3_ST_SW_CHANGE_A;
718                         s->init_num=0;
719                         break;
720
721                 case SSL3_ST_SW_CERT_STATUS_A:
722                 case SSL3_ST_SW_CERT_STATUS_B:
723                         ret=ssl3_send_cert_status(s);
724                         if (ret <= 0) goto end;
725                         s->state=SSL3_ST_SW_KEY_EXCH_A;
726                         s->init_num=0;
727                         break;
728
729 #endif
730
731                 case SSL3_ST_SW_CHANGE_A:
732                 case SSL3_ST_SW_CHANGE_B:
733
734                         s->session->cipher=s->s3->tmp.new_cipher;
735                         if (!s->method->ssl3_enc->setup_key_block(s))
736                                 { ret= -1; goto end; }
737
738                         ret=ssl3_send_change_cipher_spec(s,
739                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
740
741                         if (ret <= 0) goto end;
742                         s->state=SSL3_ST_SW_FINISHED_A;
743                         s->init_num=0;
744
745                         if (!s->method->ssl3_enc->change_cipher_state(s,
746                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
747                                 {
748                                 ret= -1;
749                                 goto end;
750                                 }
751
752                         break;
753
754                 case SSL3_ST_SW_FINISHED_A:
755                 case SSL3_ST_SW_FINISHED_B:
756                         ret=ssl3_send_finished(s,
757                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
758                                 s->method->ssl3_enc->server_finished_label,
759                                 s->method->ssl3_enc->server_finished_label_len);
760                         if (ret <= 0) goto end;
761                         s->state=SSL3_ST_SW_FLUSH;
762                         if (s->hit)
763                                 {
764 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
765                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
766 #else
767                                 if (s->s3->next_proto_neg_seen)
768                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
769                                 else
770                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
771 #endif
772                                 }
773                         else
774                                 s->s3->tmp.next_state=SSL_ST_OK;
775                         s->init_num=0;
776                         break;
777
778                 case SSL_ST_OK:
779                         /* clean a few things up */
780                         ssl3_cleanup_key_block(s);
781
782                         BUF_MEM_free(s->init_buf);
783                         s->init_buf=NULL;
784
785                         /* remove buffering on output */
786                         ssl_free_wbio_buffer(s);
787
788                         s->init_num=0;
789
790                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
791                                 {
792                                 /* actually not necessarily a 'new' session unless
793                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
794                                 
795                                 s->renegotiate=0;
796                                 s->new_session=0;
797                                 
798                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
799                                 
800                                 s->ctx->stats.sess_accept_good++;
801                                 /* s->server=1; */
802                                 s->handshake_func=ssl3_accept;
803
804                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
805                                 }
806                         
807                         ret = 1;
808                         goto end;
809                         /* break; */
810
811                 default:
812                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
813                         ret= -1;
814                         goto end;
815                         /* break; */
816                         }
817                 
818                 if (!s->s3->tmp.reuse_message && !skip)
819                         {
820                         if (s->debug)
821                                 {
822                                 if ((ret=BIO_flush(s->wbio)) <= 0)
823                                         goto end;
824                                 }
825
826
827                         if ((cb != NULL) && (s->state != state))
828                                 {
829                                 new_state=s->state;
830                                 s->state=state;
831                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
832                                 s->state=new_state;
833                                 }
834                         }
835                 skip=0;
836                 }
837 end:
838         /* BIO_flush(s->wbio); */
839
840         s->in_handshake--;
841         if (cb != NULL)
842                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
843         return(ret);
844         }
845
846 int ssl3_send_hello_request(SSL *s)
847         {
848         unsigned char *p;
849
850         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
851                 {
852                 p=(unsigned char *)s->init_buf->data;
853                 *(p++)=SSL3_MT_HELLO_REQUEST;
854                 *(p++)=0;
855                 *(p++)=0;
856                 *(p++)=0;
857
858                 s->state=SSL3_ST_SW_HELLO_REQ_B;
859                 /* number of bytes to write */
860                 s->init_num=4;
861                 s->init_off=0;
862                 }
863
864         /* SSL3_ST_SW_HELLO_REQ_B */
865         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
866         }
867
868 int ssl3_check_client_hello(SSL *s)
869         {
870         int ok;
871         long n;
872
873         /* this function is called when we really expect a Certificate message,
874          * so permit appropriate message length */
875         n=s->method->ssl_get_message(s,
876                 SSL3_ST_SR_CERT_A,
877                 SSL3_ST_SR_CERT_B,
878                 -1,
879                 s->max_cert_list,
880                 &ok);
881         if (!ok) return((int)n);
882         s->s3->tmp.reuse_message = 1;
883         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
884                 {
885                 /* Throw away what we have done so far in the current handshake,
886                  * which will now be aborted. (A full SSL_clear would be too much.)
887                  * I hope that tmp.dh is the only thing that may need to be cleared
888                  * when a handshake is not completed ... */
889 #ifndef OPENSSL_NO_DH
890                 if (s->s3->tmp.dh != NULL)
891                         {
892                         DH_free(s->s3->tmp.dh);
893                         s->s3->tmp.dh = NULL;
894                         }
895 #endif
896                 return 2;
897                 }
898         return 1;
899 }
900
901 int ssl3_get_client_hello(SSL *s)
902         {
903         int i,j,ok,al,ret= -1;
904         unsigned int cookie_len;
905         long n;
906         unsigned long id;
907         unsigned char *p,*d,*q;
908         SSL_CIPHER *c;
909 #ifndef OPENSSL_NO_COMP
910         SSL_COMP *comp=NULL;
911 #endif
912         STACK_OF(SSL_CIPHER) *ciphers=NULL;
913
914         /* We do this so that we will respond with our native type.
915          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
916          * This down switching should be handled by a different method.
917          * If we are SSLv3, we will respond with SSLv3, even if prompted with
918          * TLSv1.
919          */
920         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
921 #ifndef OPENSSL_NO_SRP
922                 || (s->state == SSL3_ST_SR_CLNT_HELLO_SRP_USERNAME)
923 #endif
924                 )
925                 {
926                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
927                 }
928         s->first_packet=1;
929         n=s->method->ssl_get_message(s,
930                 SSL3_ST_SR_CLNT_HELLO_B,
931                 SSL3_ST_SR_CLNT_HELLO_C,
932                 SSL3_MT_CLIENT_HELLO,
933                 SSL3_RT_MAX_PLAIN_LENGTH,
934                 &ok);
935
936         if (!ok) return((int)n);
937         s->first_packet=0;
938         d=p=(unsigned char *)s->init_msg;
939
940         /* use version from inside client hello, not from record header
941          * (may differ: see RFC 2246, Appendix E, second paragraph) */
942         s->client_version=(((int)p[0])<<8)|(int)p[1];
943         p+=2;
944
945         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
946             (s->version != DTLS1_VERSION && s->client_version < s->version))
947                 {
948                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
949                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
950                         {
951                         /* similar to ssl3_get_record, send alert using remote version number */
952                         s->version = s->client_version;
953                         }
954                 al = SSL_AD_PROTOCOL_VERSION;
955                 goto f_err;
956                 }
957
958         /* If we require cookies and this ClientHello doesn't
959          * contain one, just return since we do not want to
960          * allocate any memory yet. So check cookie length...
961          */
962         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
963                 {
964                 unsigned int session_length, cookie_length;
965                 
966                 session_length = *(p + SSL3_RANDOM_SIZE);
967                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
968
969                 if (cookie_length == 0)
970                         return 1;
971                 }
972
973         /* load the client random */
974         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
975         p+=SSL3_RANDOM_SIZE;
976
977         /* get the session-id */
978         j= *(p++);
979
980         s->hit=0;
981         /* Versions before 0.9.7 always allow session reuse during renegotiation
982          * (i.e. when s->new_session is true), option
983          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
984          * Maybe this optional behaviour should always have been the default,
985          * but we cannot safely change the default behaviour (or new applications
986          * might be written that become totally unsecure when compiled with
987          * an earlier library version)
988          */
989         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
990                 {
991                 if (!ssl_get_new_session(s,1))
992                         goto err;
993                 }
994         else
995                 {
996                 i=ssl_get_prev_session(s, p, j, d + n);
997                 if (i == 1)
998                         { /* previous session */
999                         s->hit=1;
1000                         }
1001                 else if (i == -1)
1002                         goto err;
1003                 else /* i == 0 */
1004                         {
1005                         if (!ssl_get_new_session(s,1))
1006                                 goto err;
1007                         }
1008                 }
1009
1010         p+=j;
1011
1012         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1013                 {
1014                 /* cookie stuff */
1015                 cookie_len = *(p++);
1016
1017                 /* 
1018                  * The ClientHello may contain a cookie even if the
1019                  * HelloVerify message has not been sent--make sure that it
1020                  * does not cause an overflow.
1021                  */
1022                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1023                         {
1024                         /* too much data */
1025                         al = SSL_AD_DECODE_ERROR;
1026                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1027                         goto f_err;
1028                         }
1029
1030                 /* verify the cookie if appropriate option is set. */
1031                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1032                         cookie_len > 0)
1033                         {
1034                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1035
1036                         if ( s->ctx->app_verify_cookie_cb != NULL)
1037                                 {
1038                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1039                                         cookie_len) == 0)
1040                                         {
1041                                         al=SSL_AD_HANDSHAKE_FAILURE;
1042                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1043                                                 SSL_R_COOKIE_MISMATCH);
1044                                         goto f_err;
1045                                         }
1046                                 /* else cookie verification succeeded */
1047                                 }
1048                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1049                                                   s->d1->cookie_len) != 0) /* default verification */
1050                                 {
1051                                         al=SSL_AD_HANDSHAKE_FAILURE;
1052                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1053                                                 SSL_R_COOKIE_MISMATCH);
1054                                         goto f_err;
1055                                 }
1056
1057                         ret = 2;
1058                         }
1059
1060                 p += cookie_len;
1061                 }
1062
1063         n2s(p,i);
1064         if ((i == 0) && (j != 0))
1065                 {
1066                 /* we need a cipher if we are not resuming a session */
1067                 al=SSL_AD_ILLEGAL_PARAMETER;
1068                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1069                 goto f_err;
1070                 }
1071         if ((p+i) >= (d+n))
1072                 {
1073                 /* not enough data */
1074                 al=SSL_AD_DECODE_ERROR;
1075                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1076                 goto f_err;
1077                 }
1078         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1079                 == NULL))
1080                 {
1081                 goto err;
1082                 }
1083         p+=i;
1084
1085         /* If it is a hit, check that the cipher is in the list */
1086         if ((s->hit) && (i > 0))
1087                 {
1088                 j=0;
1089                 id=s->session->cipher->id;
1090
1091 #ifdef CIPHER_DEBUG
1092                 printf("client sent %d ciphers\n",sk_num(ciphers));
1093 #endif
1094                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1095                         {
1096                         c=sk_SSL_CIPHER_value(ciphers,i);
1097 #ifdef CIPHER_DEBUG
1098                         printf("client [%2d of %2d]:%s\n",
1099                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1100 #endif
1101                         if (c->id == id)
1102                                 {
1103                                 j=1;
1104                                 break;
1105                                 }
1106                         }
1107 /* Disabled because it can be used in a ciphersuite downgrade
1108  * attack: CVE-2010-4180.
1109  */
1110 #if 0
1111                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1112                         {
1113                         /* Special case as client bug workaround: the previously used cipher may
1114                          * not be in the current list, the client instead might be trying to
1115                          * continue using a cipher that before wasn't chosen due to server
1116                          * preferences.  We'll have to reject the connection if the cipher is not
1117                          * enabled, though. */
1118                         c = sk_SSL_CIPHER_value(ciphers, 0);
1119                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1120                                 {
1121                                 s->session->cipher = c;
1122                                 j = 1;
1123                                 }
1124                         }
1125 #endif
1126                 if (j == 0)
1127                         {
1128                         /* we need to have the cipher in the cipher
1129                          * list if we are asked to reuse it */
1130                         al=SSL_AD_ILLEGAL_PARAMETER;
1131                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1132                         goto f_err;
1133                         }
1134                 }
1135
1136         /* compression */
1137         i= *(p++);
1138         if ((p+i) > (d+n))
1139                 {
1140                 /* not enough data */
1141                 al=SSL_AD_DECODE_ERROR;
1142                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1143                 goto f_err;
1144                 }
1145         q=p;
1146         for (j=0; j<i; j++)
1147                 {
1148                 if (p[j] == 0) break;
1149                 }
1150
1151         p+=i;
1152         if (j >= i)
1153                 {
1154                 /* no compress */
1155                 al=SSL_AD_DECODE_ERROR;
1156                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1157                 goto f_err;
1158                 }
1159
1160 #ifndef OPENSSL_NO_TLSEXT
1161         /* TLS extensions*/
1162         if (s->version >= SSL3_VERSION)
1163                 {
1164                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1165                         {
1166                         /* 'al' set by ssl_parse_clienthello_tlsext */
1167                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1168                         goto f_err;
1169                         }
1170                 }
1171                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1172                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1173                         goto err;
1174                 }
1175
1176         /* Check if we want to use external pre-shared secret for this
1177          * handshake for not reused session only. We need to generate
1178          * server_random before calling tls_session_secret_cb in order to allow
1179          * SessionTicket processing to use it in key derivation. */
1180         {
1181                 unsigned long Time;
1182                 unsigned char *pos;
1183                 Time=(unsigned long)time(NULL);                 /* Time */
1184                 pos=s->s3->server_random;
1185                 l2n(Time,pos);
1186                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1187                         {
1188                         al=SSL_AD_INTERNAL_ERROR;
1189                         goto f_err;
1190                         }
1191         }
1192
1193         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1194                 {
1195                 SSL_CIPHER *pref_cipher=NULL;
1196
1197                 s->session->master_key_length=sizeof(s->session->master_key);
1198                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1199                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1200                         {
1201                         s->hit=1;
1202                         s->session->ciphers=ciphers;
1203                         s->session->verify_result=X509_V_OK;
1204
1205                         ciphers=NULL;
1206
1207                         /* check if some cipher was preferred by call back */
1208                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1209                         if (pref_cipher == NULL)
1210                                 {
1211                                 al=SSL_AD_HANDSHAKE_FAILURE;
1212                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1213                                 goto f_err;
1214                                 }
1215
1216                         s->session->cipher=pref_cipher;
1217
1218                         if (s->cipher_list)
1219                                 sk_SSL_CIPHER_free(s->cipher_list);
1220
1221                         if (s->cipher_list_by_id)
1222                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1223
1224                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1225                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1226                         }
1227                 }
1228 #endif
1229
1230         /* Worst case, we will use the NULL compression, but if we have other
1231          * options, we will now look for them.  We have i-1 compression
1232          * algorithms from the client, starting at q. */
1233         s->s3->tmp.new_compression=NULL;
1234 #ifndef OPENSSL_NO_COMP
1235         /* This only happens if we have a cache hit */
1236         if (s->session->compress_meth != 0)
1237                 {
1238                 int m, comp_id = s->session->compress_meth;
1239                 /* Perform sanity checks on resumed compression algorithm */
1240                 /* Can't disable compression */
1241                 if (s->options & SSL_OP_NO_COMPRESSION)
1242                         {
1243                         al=SSL_AD_INTERNAL_ERROR;
1244                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1245                         goto f_err;
1246                         }
1247                 /* Look for resumed compression method */
1248                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1249                         {
1250                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1251                         if (comp_id == comp->id)
1252                                 {
1253                                 s->s3->tmp.new_compression=comp;
1254                                 break;
1255                                 }
1256                         }
1257                 if (s->s3->tmp.new_compression == NULL)
1258                         {
1259                         al=SSL_AD_INTERNAL_ERROR;
1260                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1261                         goto f_err;
1262                         }
1263                 /* Look for resumed method in compression list */
1264                 for (m = 0; m < i; m++)
1265                         {
1266                         if (q[m] == comp_id)
1267                                 break;
1268                         }
1269                 if (m >= i)
1270                         {
1271                         al=SSL_AD_ILLEGAL_PARAMETER;
1272                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1273                         goto f_err;
1274                         }
1275                 }
1276         else if (s->hit)
1277                 comp = NULL;
1278         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1279                 { /* See if we have a match */
1280                 int m,nn,o,v,done=0;
1281
1282                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1283                 for (m=0; m<nn; m++)
1284                         {
1285                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1286                         v=comp->id;
1287                         for (o=0; o<i; o++)
1288                                 {
1289                                 if (v == q[o])
1290                                         {
1291                                         done=1;
1292                                         break;
1293                                         }
1294                                 }
1295                         if (done) break;
1296                         }
1297                 if (done)
1298                         s->s3->tmp.new_compression=comp;
1299                 else
1300                         comp=NULL;
1301                 }
1302 #else
1303         /* If compression is disabled we'd better not try to resume a session
1304          * using compression.
1305          */
1306         if (s->session->compress_meth != 0)
1307                 {
1308                 al=SSL_AD_INTERNAL_ERROR;
1309                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1310                 goto f_err;
1311                 }
1312 #endif
1313
1314         /* Given s->session->ciphers and SSL_get_ciphers, we must
1315          * pick a cipher */
1316
1317         if (!s->hit)
1318                 {
1319 #ifdef OPENSSL_NO_COMP
1320                 s->session->compress_meth=0;
1321 #else
1322                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1323 #endif
1324                 if (s->session->ciphers != NULL)
1325                         sk_SSL_CIPHER_free(s->session->ciphers);
1326                 s->session->ciphers=ciphers;
1327                 if (ciphers == NULL)
1328                         {
1329                         al=SSL_AD_ILLEGAL_PARAMETER;
1330                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1331                         goto f_err;
1332                         }
1333                 ciphers=NULL;
1334                 c=ssl3_choose_cipher(s,s->session->ciphers,
1335                                      SSL_get_ciphers(s));
1336
1337                 if (c == NULL)
1338                         {
1339                         al=SSL_AD_HANDSHAKE_FAILURE;
1340                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1341                         goto f_err;
1342                         }
1343                 s->s3->tmp.new_cipher=c;
1344                 /* check whether we should disable session resumption */
1345                 if (s->not_resumable_session_cb != NULL)
1346                         s->session->not_resumable=s->not_resumable_session_cb(s,
1347                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1348                 if (s->session->not_resumable)
1349                         /* do not send a session ticket */
1350                         s->tlsext_ticket_expected = 0;
1351                 }
1352         else
1353                 {
1354                 /* Session-id reuse */
1355 #ifdef REUSE_CIPHER_BUG
1356                 STACK_OF(SSL_CIPHER) *sk;
1357                 SSL_CIPHER *nc=NULL;
1358                 SSL_CIPHER *ec=NULL;
1359
1360                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1361                         {
1362                         sk=s->session->ciphers;
1363                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1364                                 {
1365                                 c=sk_SSL_CIPHER_value(sk,i);
1366                                 if (c->algorithm_enc & SSL_eNULL)
1367                                         nc=c;
1368                                 if (SSL_C_IS_EXPORT(c))
1369                                         ec=c;
1370                                 }
1371                         if (nc != NULL)
1372                                 s->s3->tmp.new_cipher=nc;
1373                         else if (ec != NULL)
1374                                 s->s3->tmp.new_cipher=ec;
1375                         else
1376                                 s->s3->tmp.new_cipher=s->session->cipher;
1377                         }
1378                 else
1379 #endif
1380                 s->s3->tmp.new_cipher=s->session->cipher;
1381                 }
1382
1383         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1384                 {
1385                 if (!ssl3_digest_cached_records(s))
1386                         goto f_err;
1387                 }
1388         
1389         /* we now have the following setup. 
1390          * client_random
1391          * cipher_list          - our prefered list of ciphers
1392          * ciphers              - the clients prefered list of ciphers
1393          * compression          - basically ignored right now
1394          * ssl version is set   - sslv3
1395          * s->session           - The ssl session has been setup.
1396          * s->hit               - session reuse flag
1397          * s->tmp.new_cipher    - the new cipher to use.
1398          */
1399
1400         if (ret < 0) ret=1;
1401         if (0)
1402                 {
1403 f_err:
1404                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1405                 }
1406 err:
1407         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1408         return(ret);
1409         }
1410
1411 int ssl3_send_server_hello(SSL *s)
1412         {
1413         unsigned char *buf;
1414         unsigned char *p,*d;
1415         int i,sl;
1416         unsigned long l;
1417 #ifdef OPENSSL_NO_TLSEXT
1418         unsigned long Time;
1419 #endif
1420
1421         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1422                 {
1423                 buf=(unsigned char *)s->init_buf->data;
1424 #ifdef OPENSSL_NO_TLSEXT
1425                 p=s->s3->server_random;
1426                 /* Generate server_random if it was not needed previously */
1427                 Time=(unsigned long)time(NULL);                 /* Time */
1428                 l2n(Time,p);
1429                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1430                         return -1;
1431 #endif
1432                 /* Do the message type and length last */
1433                 d=p= &(buf[4]);
1434
1435                 *(p++)=s->version>>8;
1436                 *(p++)=s->version&0xff;
1437
1438                 /* Random stuff */
1439                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1440                 p+=SSL3_RANDOM_SIZE;
1441
1442                 /* now in theory we have 3 options to sending back the
1443                  * session id.  If it is a re-use, we send back the
1444                  * old session-id, if it is a new session, we send
1445                  * back the new session-id or we send back a 0 length
1446                  * session-id if we want it to be single use.
1447                  * Currently I will not implement the '0' length session-id
1448                  * 12-Jan-98 - I'll now support the '0' length stuff.
1449                  *
1450                  * We also have an additional case where stateless session
1451                  * resumption is successful: we always send back the old
1452                  * session id. In this case s->hit is non zero: this can
1453                  * only happen if stateless session resumption is succesful
1454                  * if session caching is disabled so existing functionality
1455                  * is unaffected.
1456                  */
1457                 if (s->session->not_resumable ||
1458                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1459                                 && !s->hit))
1460                         s->session->session_id_length=0;
1461
1462                 sl=s->session->session_id_length;
1463                 if (sl > (int)sizeof(s->session->session_id))
1464                         {
1465                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1466                         return -1;
1467                         }
1468                 *(p++)=sl;
1469                 memcpy(p,s->session->session_id,sl);
1470                 p+=sl;
1471
1472                 /* put the cipher */
1473                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1474                 p+=i;
1475
1476                 /* put the compression method */
1477 #ifdef OPENSSL_NO_COMP
1478                         *(p++)=0;
1479 #else
1480                 if (s->s3->tmp.new_compression == NULL)
1481                         *(p++)=0;
1482                 else
1483                         *(p++)=s->s3->tmp.new_compression->id;
1484 #endif
1485 #ifndef OPENSSL_NO_TLSEXT
1486                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1487                         {
1488                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1489                         return -1;
1490                         }
1491                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1492                         {
1493                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1494                         return -1;
1495                         }
1496 #endif
1497                 /* do the header */
1498                 l=(p-d);
1499                 d=buf;
1500                 *(d++)=SSL3_MT_SERVER_HELLO;
1501                 l2n3(l,d);
1502
1503                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1504                 /* number of bytes to write */
1505                 s->init_num=p-buf;
1506                 s->init_off=0;
1507                 }
1508
1509         /* SSL3_ST_SW_SRVR_HELLO_B */
1510         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1511         }
1512
1513 int ssl3_send_server_done(SSL *s)
1514         {
1515         unsigned char *p;
1516
1517         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1518                 {
1519                 p=(unsigned char *)s->init_buf->data;
1520
1521                 /* do the header */
1522                 *(p++)=SSL3_MT_SERVER_DONE;
1523                 *(p++)=0;
1524                 *(p++)=0;
1525                 *(p++)=0;
1526
1527                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1528                 /* number of bytes to write */
1529                 s->init_num=4;
1530                 s->init_off=0;
1531                 }
1532
1533         /* SSL3_ST_SW_SRVR_DONE_B */
1534         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1535         }
1536
1537 int ssl3_send_server_key_exchange(SSL *s)
1538         {
1539 #ifndef OPENSSL_NO_RSA
1540         unsigned char *q;
1541         int j,num;
1542         RSA *rsa;
1543         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1544         unsigned int u;
1545 #endif
1546 #ifndef OPENSSL_NO_DH
1547         DH *dh=NULL,*dhp;
1548 #endif
1549 #ifndef OPENSSL_NO_ECDH
1550         EC_KEY *ecdh=NULL, *ecdhp;
1551         unsigned char *encodedPoint = NULL;
1552         int encodedlen = 0;
1553         int curve_id = 0;
1554         BN_CTX *bn_ctx = NULL; 
1555 #endif
1556         EVP_PKEY *pkey;
1557         const EVP_MD *md = NULL;
1558         unsigned char *p,*d;
1559         int al,i;
1560         unsigned long type;
1561         int n;
1562         CERT *cert;
1563         BIGNUM *r[4];
1564         int nr[4],kn;
1565         BUF_MEM *buf;
1566         EVP_MD_CTX md_ctx;
1567
1568         EVP_MD_CTX_init(&md_ctx);
1569         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1570                 {
1571                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1572                 cert=s->cert;
1573
1574                 buf=s->init_buf;
1575
1576                 r[0]=r[1]=r[2]=r[3]=NULL;
1577                 n=0;
1578 #ifndef OPENSSL_NO_RSA
1579                 if (type & SSL_kRSA)
1580                         {
1581                         rsa=cert->rsa_tmp;
1582                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1583                                 {
1584                                 rsa=s->cert->rsa_tmp_cb(s,
1585                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1586                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1587                                 if(rsa == NULL)
1588                                 {
1589                                         al=SSL_AD_HANDSHAKE_FAILURE;
1590                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1591                                         goto f_err;
1592                                 }
1593                                 RSA_up_ref(rsa);
1594                                 cert->rsa_tmp=rsa;
1595                                 }
1596                         if (rsa == NULL)
1597                                 {
1598                                 al=SSL_AD_HANDSHAKE_FAILURE;
1599                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1600                                 goto f_err;
1601                                 }
1602                         r[0]=rsa->n;
1603                         r[1]=rsa->e;
1604                         s->s3->tmp.use_rsa_tmp=1;
1605                         }
1606                 else
1607 #endif
1608 #ifndef OPENSSL_NO_DH
1609                         if (type & SSL_kEDH)
1610                         {
1611                         dhp=cert->dh_tmp;
1612                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1613                                 dhp=s->cert->dh_tmp_cb(s,
1614                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1615                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1616                         if (dhp == NULL)
1617                                 {
1618                                 al=SSL_AD_HANDSHAKE_FAILURE;
1619                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1620                                 goto f_err;
1621                                 }
1622
1623                         if (s->s3->tmp.dh != NULL)
1624                                 {
1625                                 DH_free(dh);
1626                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1627                                 goto err;
1628                                 }
1629
1630                         if ((dh=DHparams_dup(dhp)) == NULL)
1631                                 {
1632                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1633                                 goto err;
1634                                 }
1635
1636                         s->s3->tmp.dh=dh;
1637                         if ((dhp->pub_key == NULL ||
1638                              dhp->priv_key == NULL ||
1639                              (s->options & SSL_OP_SINGLE_DH_USE)))
1640                                 {
1641                                 if(!DH_generate_key(dh))
1642                                     {
1643                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1644                                            ERR_R_DH_LIB);
1645                                     goto err;
1646                                     }
1647                                 }
1648                         else
1649                                 {
1650                                 dh->pub_key=BN_dup(dhp->pub_key);
1651                                 dh->priv_key=BN_dup(dhp->priv_key);
1652                                 if ((dh->pub_key == NULL) ||
1653                                         (dh->priv_key == NULL))
1654                                         {
1655                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1656                                         goto err;
1657                                         }
1658                                 }
1659                         r[0]=dh->p;
1660                         r[1]=dh->g;
1661                         r[2]=dh->pub_key;
1662                         }
1663                 else 
1664 #endif
1665 #ifndef OPENSSL_NO_ECDH
1666                         if (type & SSL_kEECDH)
1667                         {
1668                         const EC_GROUP *group;
1669
1670                         ecdhp=cert->ecdh_tmp;
1671                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1672                                 {
1673                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1674                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1675                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1676                                 }
1677                         if (ecdhp == NULL)
1678                                 {
1679                                 al=SSL_AD_HANDSHAKE_FAILURE;
1680                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1681                                 goto f_err;
1682                                 }
1683
1684                         if (s->s3->tmp.ecdh != NULL)
1685                                 {
1686                                 EC_KEY_free(s->s3->tmp.ecdh); 
1687                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1688                                 goto err;
1689                                 }
1690
1691                         /* Duplicate the ECDH structure. */
1692                         if (ecdhp == NULL)
1693                                 {
1694                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1695                                 goto err;
1696                                 }
1697                         if (!EC_KEY_up_ref(ecdhp))
1698                                 {
1699                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1700                                 goto err;
1701                                 }
1702                         ecdh = ecdhp;
1703
1704                         s->s3->tmp.ecdh=ecdh;
1705                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1706                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1707                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1708                                 {
1709                                 if(!EC_KEY_generate_key(ecdh))
1710                                     {
1711                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1712                                     goto err;
1713                                     }
1714                                 }
1715
1716                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1717                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1718                             (EC_KEY_get0_private_key(ecdh) == NULL))
1719                                 {
1720                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1721                                 goto err;
1722                                 }
1723
1724                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1725                             (EC_GROUP_get_degree(group) > 163)) 
1726                                 {
1727                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1728                                 goto err;
1729                                 }
1730
1731                         /* XXX: For now, we only support ephemeral ECDH
1732                          * keys over named (not generic) curves. For 
1733                          * supported named curves, curve_id is non-zero.
1734                          */
1735                         if ((curve_id = 
1736                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1737                             == 0)
1738                                 {
1739                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1740                                 goto err;
1741                                 }
1742
1743                         /* Encode the public key.
1744                          * First check the size of encoding and
1745                          * allocate memory accordingly.
1746                          */
1747                         encodedlen = EC_POINT_point2oct(group, 
1748                             EC_KEY_get0_public_key(ecdh),
1749                             POINT_CONVERSION_UNCOMPRESSED, 
1750                             NULL, 0, NULL);
1751
1752                         encodedPoint = (unsigned char *) 
1753                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1754                         bn_ctx = BN_CTX_new();
1755                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1756                                 {
1757                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1758                                 goto err;
1759                                 }
1760
1761
1762                         encodedlen = EC_POINT_point2oct(group, 
1763                             EC_KEY_get0_public_key(ecdh), 
1764                             POINT_CONVERSION_UNCOMPRESSED, 
1765                             encodedPoint, encodedlen, bn_ctx);
1766
1767                         if (encodedlen == 0) 
1768                                 {
1769                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1770                                 goto err;
1771                                 }
1772
1773                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1774
1775                         /* XXX: For now, we only support named (not 
1776                          * generic) curves in ECDH ephemeral key exchanges.
1777                          * In this situation, we need four additional bytes
1778                          * to encode the entire ServerECDHParams
1779                          * structure. 
1780                          */
1781                         n = 4 + encodedlen;
1782
1783                         /* We'll generate the serverKeyExchange message
1784                          * explicitly so we can set these to NULLs
1785                          */
1786                         r[0]=NULL;
1787                         r[1]=NULL;
1788                         r[2]=NULL;
1789                         r[3]=NULL;
1790                         }
1791                 else 
1792 #endif /* !OPENSSL_NO_ECDH */
1793 #ifndef OPENSSL_NO_PSK
1794                         if (type & SSL_kPSK)
1795                                 {
1796                                 /* reserve size for record length and PSK identity hint*/
1797                                 n+=2+strlen(s->ctx->psk_identity_hint);
1798                                 }
1799                         else
1800 #endif /* !OPENSSL_NO_PSK */
1801 #ifndef OPENSSL_NO_SRP
1802                 if (type & SSL_kSRP)
1803                         {
1804                         if ((s->srp_ctx.N == NULL) ||
1805                                 (s->srp_ctx.g == NULL) ||
1806                                 (s->srp_ctx.s == NULL) ||
1807                                 (s->srp_ctx.B == NULL))
1808                                 {
1809                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1810                                 goto err;
1811                                 }
1812                         r[0]=s->srp_ctx.N;
1813                         r[1]=s->srp_ctx.g;
1814                         r[2]=s->srp_ctx.s;
1815                         r[3]=s->srp_ctx.B;
1816                         }
1817                 else 
1818 #endif
1819                         {
1820                         al=SSL_AD_HANDSHAKE_FAILURE;
1821                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1822                         goto f_err;
1823                         }
1824                 for (i=0; r[i] != NULL && i<4; i++)
1825                         {
1826                         nr[i]=BN_num_bytes(r[i]);
1827 #ifndef OPENSSL_NO_SRP
1828                         if ((i == 2) && (type & SSL_kSRP))
1829                                 n+=1+nr[i];
1830                         else
1831 #endif
1832                         n+=2+nr[i];
1833                         }
1834
1835                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1836                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1837                         {
1838                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1839                                 == NULL)
1840                                 {
1841                                 al=SSL_AD_DECODE_ERROR;
1842                                 goto f_err;
1843                                 }
1844                         kn=EVP_PKEY_size(pkey);
1845                         }
1846                 else
1847                         {
1848                         pkey=NULL;
1849                         kn=0;
1850                         }
1851
1852                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1853                         {
1854                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1855                         goto err;
1856                         }
1857                 d=(unsigned char *)s->init_buf->data;
1858                 p= &(d[4]);
1859
1860                 for (i=0; r[i] != NULL && i<4; i++)
1861                         {
1862 #ifndef OPENSSL_NO_SRP
1863                         if ((i == 2) && (type & SSL_kSRP))
1864                                 {
1865                                 *p = nr[i];
1866                                 p++;
1867                                 }
1868                         else
1869 #endif
1870                         s2n(nr[i],p);
1871                         BN_bn2bin(r[i],p);
1872                         p+=nr[i];
1873                         }
1874
1875 #ifndef OPENSSL_NO_ECDH
1876                 if (type & SSL_kEECDH) 
1877                         {
1878                         /* XXX: For now, we only support named (not generic) curves.
1879                          * In this situation, the serverKeyExchange message has:
1880                          * [1 byte CurveType], [2 byte CurveName]
1881                          * [1 byte length of encoded point], followed by
1882                          * the actual encoded point itself
1883                          */
1884                         *p = NAMED_CURVE_TYPE;
1885                         p += 1;
1886                         *p = 0;
1887                         p += 1;
1888                         *p = curve_id;
1889                         p += 1;
1890                         *p = encodedlen;
1891                         p += 1;
1892                         memcpy((unsigned char*)p, 
1893                             (unsigned char *)encodedPoint, 
1894                             encodedlen);
1895                         OPENSSL_free(encodedPoint);
1896                         encodedPoint = NULL;
1897                         p += encodedlen;
1898                         }
1899 #endif
1900
1901 #ifndef OPENSSL_NO_PSK
1902                 if (type & SSL_kPSK)
1903                         {
1904                         /* copy PSK identity hint */
1905                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1906                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1907                         p+=strlen(s->ctx->psk_identity_hint);
1908                         }
1909 #endif
1910
1911                 /* not anonymous */
1912                 if (pkey != NULL)
1913                         {
1914                         /* n is the length of the params, they start at &(d[4])
1915                          * and p points to the space at the end. */
1916 #ifndef OPENSSL_NO_RSA
1917                         if (pkey->type == EVP_PKEY_RSA
1918                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1919                                 {
1920                                 q=md_buf;
1921                                 j=0;
1922                                 for (num=2; num > 0; num--)
1923                                         {
1924                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1925                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1926                                         EVP_MD_CTX_set_flags(&md_ctx,
1927                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1928                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1929                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1930                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1931                                         EVP_DigestFinal_ex(&md_ctx,q,
1932                                                 (unsigned int *)&i);
1933                                         q+=i;
1934                                         j+=i;
1935                                         }
1936                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1937                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1938                                         {
1939                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1940                                         goto err;
1941                                         }
1942                                 s2n(u,p);
1943                                 n+=u+2;
1944                                 }
1945                         else
1946 #endif
1947                         if (md)
1948                                 {
1949                                 /* For TLS1.2 and later send signature
1950                                  * algorithm */
1951                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1952                                         {
1953                                         if (!tls12_get_sigandhash(p, pkey, md))
1954                                                 {
1955                                                 /* Should never happen */
1956                                                 al=SSL_AD_INTERNAL_ERROR;
1957                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1958                                                 goto f_err;
1959                                                 }
1960                                         p+=2;
1961                                         }
1962 #ifdef SSL_DEBUG
1963                                 fprintf(stderr, "Using hash %s\n",
1964                                                         EVP_MD_name(md));
1965 #endif
1966                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1967                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1968                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1969                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1970                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1971                                         (unsigned int *)&i,pkey))
1972                                         {
1973                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1974                                         goto err;
1975                                         }
1976                                 s2n(i,p);
1977                                 n+=i+2;
1978                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1979                                         n+= 2;
1980                                 }
1981                         else
1982                                 {
1983                                 /* Is this error check actually needed? */
1984                                 al=SSL_AD_HANDSHAKE_FAILURE;
1985                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1986                                 goto f_err;
1987                                 }
1988                         }
1989
1990                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1991                 l2n3(n,d);
1992
1993                 /* we should now have things packed up, so lets send
1994                  * it off */
1995                 s->init_num=n+4;
1996                 s->init_off=0;
1997                 }
1998
1999         s->state = SSL3_ST_SW_KEY_EXCH_B;
2000         EVP_MD_CTX_cleanup(&md_ctx);
2001         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2002 f_err:
2003         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2004 err:
2005 #ifndef OPENSSL_NO_ECDH
2006         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2007         BN_CTX_free(bn_ctx);
2008 #endif
2009         EVP_MD_CTX_cleanup(&md_ctx);
2010         return(-1);
2011         }
2012
2013 int ssl3_send_certificate_request(SSL *s)
2014         {
2015         unsigned char *p,*d;
2016         int i,j,nl,off,n;
2017         STACK_OF(X509_NAME) *sk=NULL;
2018         X509_NAME *name;
2019         BUF_MEM *buf;
2020
2021         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2022                 {
2023                 buf=s->init_buf;
2024
2025                 d=p=(unsigned char *)&(buf->data[4]);
2026
2027                 /* get the list of acceptable cert types */
2028                 p++;
2029                 n=ssl3_get_req_cert_type(s,p);
2030                 d[0]=n;
2031                 p+=n;
2032                 n++;
2033
2034                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2035                         {
2036                         nl = tls12_get_req_sig_algs(s, p + 2);
2037                         s2n(nl, p);
2038                         p += nl + 2;
2039                         n += nl + 2;
2040                         }
2041
2042                 off=n;
2043                 p+=2;
2044                 n+=2;
2045
2046                 sk=SSL_get_client_CA_list(s);
2047                 nl=0;
2048                 if (sk != NULL)
2049                         {
2050                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2051                                 {
2052                                 name=sk_X509_NAME_value(sk,i);
2053                                 j=i2d_X509_NAME(name,NULL);
2054                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2055                                         {
2056                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2057                                         goto err;
2058                                         }
2059                                 p=(unsigned char *)&(buf->data[4+n]);
2060                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2061                                         {
2062                                         s2n(j,p);
2063                                         i2d_X509_NAME(name,&p);
2064                                         n+=2+j;
2065                                         nl+=2+j;
2066                                         }
2067                                 else
2068                                         {
2069                                         d=p;
2070                                         i2d_X509_NAME(name,&p);
2071                                         j-=2; s2n(j,d); j+=2;
2072                                         n+=j;
2073                                         nl+=j;
2074                                         }
2075                                 }
2076                         }
2077                 /* else no CA names */
2078                 p=(unsigned char *)&(buf->data[4+off]);
2079                 s2n(nl,p);
2080
2081                 d=(unsigned char *)buf->data;
2082                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2083                 l2n3(n,d);
2084
2085                 /* we should now have things packed up, so lets send
2086                  * it off */
2087
2088                 s->init_num=n+4;
2089                 s->init_off=0;
2090 #ifdef NETSCAPE_HANG_BUG
2091                 p=(unsigned char *)s->init_buf->data + s->init_num;
2092
2093                 /* do the header */
2094                 *(p++)=SSL3_MT_SERVER_DONE;
2095                 *(p++)=0;
2096                 *(p++)=0;
2097                 *(p++)=0;
2098                 s->init_num += 4;
2099 #endif
2100
2101                 s->state = SSL3_ST_SW_CERT_REQ_B;
2102                 }
2103
2104         /* SSL3_ST_SW_CERT_REQ_B */
2105         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2106 err:
2107         return(-1);
2108         }
2109
2110 int ssl3_get_client_key_exchange(SSL *s)
2111         {
2112         int i,al,ok;
2113         long n;
2114         unsigned long alg_k;
2115         unsigned char *p;
2116 #ifndef OPENSSL_NO_RSA
2117         RSA *rsa=NULL;
2118         EVP_PKEY *pkey=NULL;
2119 #endif
2120 #ifndef OPENSSL_NO_DH
2121         BIGNUM *pub=NULL;
2122         DH *dh_srvr;
2123 #endif
2124 #ifndef OPENSSL_NO_KRB5
2125         KSSL_ERR kssl_err;
2126 #endif /* OPENSSL_NO_KRB5 */
2127
2128 #ifndef OPENSSL_NO_ECDH
2129         EC_KEY *srvr_ecdh = NULL;
2130         EVP_PKEY *clnt_pub_pkey = NULL;
2131         EC_POINT *clnt_ecpoint = NULL;
2132         BN_CTX *bn_ctx = NULL; 
2133 #endif
2134
2135         n=s->method->ssl_get_message(s,
2136                 SSL3_ST_SR_KEY_EXCH_A,
2137                 SSL3_ST_SR_KEY_EXCH_B,
2138                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2139                 2048, /* ??? */
2140                 &ok);
2141
2142         if (!ok) return((int)n);
2143         p=(unsigned char *)s->init_msg;
2144
2145         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2146
2147 #ifndef OPENSSL_NO_RSA
2148         if (alg_k & SSL_kRSA)
2149                 {
2150                 /* FIX THIS UP EAY EAY EAY EAY */
2151                 if (s->s3->tmp.use_rsa_tmp)
2152                         {
2153                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2154                                 rsa=s->cert->rsa_tmp;
2155                         /* Don't do a callback because rsa_tmp should
2156                          * be sent already */
2157                         if (rsa == NULL)
2158                                 {
2159                                 al=SSL_AD_HANDSHAKE_FAILURE;
2160                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2161                                 goto f_err;
2162
2163                                 }
2164                         }
2165                 else
2166                         {
2167                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2168                         if (    (pkey == NULL) ||
2169                                 (pkey->type != EVP_PKEY_RSA) ||
2170                                 (pkey->pkey.rsa == NULL))
2171                                 {
2172                                 al=SSL_AD_HANDSHAKE_FAILURE;
2173                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2174                                 goto f_err;
2175                                 }
2176                         rsa=pkey->pkey.rsa;
2177                         }
2178
2179                 /* TLS and [incidentally] DTLS{0xFEFF} */
2180                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2181                         {
2182                         n2s(p,i);
2183                         if (n != i+2)
2184                                 {
2185                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2186                                         {
2187                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2188                                         goto err;
2189                                         }
2190                                 else
2191                                         p-=2;
2192                                 }
2193                         else
2194                                 n=i;
2195                         }
2196
2197                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2198
2199                 al = -1;
2200                 
2201                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2202                         {
2203                         al=SSL_AD_DECODE_ERROR;
2204                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2205                         }
2206
2207                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2208                         {
2209                         /* The premaster secret must contain the same version number as the
2210                          * ClientHello to detect version rollback attacks (strangely, the
2211                          * protocol does not offer such protection for DH ciphersuites).
2212                          * However, buggy clients exist that send the negotiated protocol
2213                          * version instead if the server does not support the requested
2214                          * protocol version.
2215                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2216                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2217                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2218                                 {
2219                                 al=SSL_AD_DECODE_ERROR;
2220                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2221
2222                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2223                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2224                                  * number check as a "bad version oracle" -- an alert would
2225                                  * reveal that the plaintext corresponding to some ciphertext
2226                                  * made up by the adversary is properly formatted except
2227                                  * that the version number is wrong.  To avoid such attacks,
2228                                  * we should treat this just like any other decryption error. */
2229                                 }
2230                         }
2231
2232                 if (al != -1)
2233                         {
2234                         /* Some decryption failure -- use random value instead as countermeasure
2235                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2236                          * (see RFC 2246, section 7.4.7.1). */
2237                         ERR_clear_error();
2238                         i = SSL_MAX_MASTER_KEY_LENGTH;
2239                         p[0] = s->client_version >> 8;
2240                         p[1] = s->client_version & 0xff;
2241                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2242                                 goto err;
2243                         }
2244         
2245                 s->session->master_key_length=
2246                         s->method->ssl3_enc->generate_master_secret(s,
2247                                 s->session->master_key,
2248                                 p,i);
2249                 OPENSSL_cleanse(p,i);
2250                 }
2251         else
2252 #endif
2253 #ifndef OPENSSL_NO_DH
2254                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2255                 {
2256                 n2s(p,i);
2257                 if (n != i+2)
2258                         {
2259                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2260                                 {
2261                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2262                                 goto err;
2263                                 }
2264                         else
2265                                 {
2266                                 p-=2;
2267                                 i=(int)n;
2268                                 }
2269                         }
2270
2271                 if (n == 0L) /* the parameters are in the cert */
2272                         {
2273                         al=SSL_AD_HANDSHAKE_FAILURE;
2274                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2275                         goto f_err;
2276                         }
2277                 else
2278                         {
2279                         if (s->s3->tmp.dh == NULL)
2280                                 {
2281                                 al=SSL_AD_HANDSHAKE_FAILURE;
2282                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2283                                 goto f_err;
2284                                 }
2285                         else
2286                                 dh_srvr=s->s3->tmp.dh;
2287                         }
2288
2289                 pub=BN_bin2bn(p,i,NULL);
2290                 if (pub == NULL)
2291                         {
2292                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2293                         goto err;
2294                         }
2295
2296                 i=DH_compute_key(p,pub,dh_srvr);
2297
2298                 if (i <= 0)
2299                         {
2300                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2301                         goto err;
2302                         }
2303
2304                 DH_free(s->s3->tmp.dh);
2305                 s->s3->tmp.dh=NULL;
2306
2307                 BN_clear_free(pub);
2308                 pub=NULL;
2309                 s->session->master_key_length=
2310                         s->method->ssl3_enc->generate_master_secret(s,
2311                                 s->session->master_key,p,i);
2312                 OPENSSL_cleanse(p,i);
2313                 }
2314         else
2315 #endif
2316 #ifndef OPENSSL_NO_KRB5
2317         if (alg_k & SSL_kKRB5)
2318                 {
2319                 krb5_error_code         krb5rc;
2320                 krb5_data               enc_ticket;
2321                 krb5_data               authenticator;
2322                 krb5_data               enc_pms;
2323                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2324                 EVP_CIPHER_CTX          ciph_ctx;
2325                 const EVP_CIPHER        *enc = NULL;
2326                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2327                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2328                                                + EVP_MAX_BLOCK_LENGTH];
2329                 int                  padl, outl;
2330                 krb5_timestamp          authtime = 0;
2331                 krb5_ticket_times       ttimes;
2332
2333                 EVP_CIPHER_CTX_init(&ciph_ctx);
2334
2335                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2336
2337                 n2s(p,i);
2338                 enc_ticket.length = i;
2339
2340                 if (n < (long)(enc_ticket.length + 6))
2341                         {
2342                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2343                                 SSL_R_DATA_LENGTH_TOO_LONG);
2344                         goto err;
2345                         }
2346
2347                 enc_ticket.data = (char *)p;
2348                 p+=enc_ticket.length;
2349
2350                 n2s(p,i);
2351                 authenticator.length = i;
2352
2353                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2354                         {
2355                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2356                                 SSL_R_DATA_LENGTH_TOO_LONG);
2357                         goto err;
2358                         }
2359
2360                 authenticator.data = (char *)p;
2361                 p+=authenticator.length;
2362
2363                 n2s(p,i);
2364                 enc_pms.length = i;
2365                 enc_pms.data = (char *)p;
2366                 p+=enc_pms.length;
2367
2368                 /* Note that the length is checked again below,
2369                 ** after decryption
2370                 */
2371                 if(enc_pms.length > sizeof pms)
2372                         {
2373                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2374                                SSL_R_DATA_LENGTH_TOO_LONG);
2375                         goto err;
2376                         }
2377
2378                 if (n != (long)(enc_ticket.length + authenticator.length +
2379                                                 enc_pms.length + 6))
2380                         {
2381                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2382                                 SSL_R_DATA_LENGTH_TOO_LONG);
2383                         goto err;
2384                         }
2385
2386                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2387                                         &kssl_err)) != 0)
2388                         {
2389 #ifdef KSSL_DEBUG
2390                         printf("kssl_sget_tkt rtn %d [%d]\n",
2391                                 krb5rc, kssl_err.reason);
2392                         if (kssl_err.text)
2393                                 printf("kssl_err text= %s\n", kssl_err.text);
2394 #endif  /* KSSL_DEBUG */
2395                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2396                                 kssl_err.reason);
2397                         goto err;
2398                         }
2399
2400                 /*  Note: no authenticator is not considered an error,
2401                 **  but will return authtime == 0.
2402                 */
2403                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2404                                         &authtime, &kssl_err)) != 0)
2405                         {
2406 #ifdef KSSL_DEBUG
2407                         printf("kssl_check_authent rtn %d [%d]\n",
2408                                 krb5rc, kssl_err.reason);
2409                         if (kssl_err.text)
2410                                 printf("kssl_err text= %s\n", kssl_err.text);
2411 #endif  /* KSSL_DEBUG */
2412                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2413                                 kssl_err.reason);
2414                         goto err;
2415                         }
2416
2417                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2418                         {
2419                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2420                         goto err;
2421                         }
2422
2423 #ifdef KSSL_DEBUG
2424                 kssl_ctx_show(kssl_ctx);
2425 #endif  /* KSSL_DEBUG */
2426
2427                 enc = kssl_map_enc(kssl_ctx->enctype);
2428                 if (enc == NULL)
2429                     goto err;
2430
2431                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2432
2433                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2434                         {
2435                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2436                                 SSL_R_DECRYPTION_FAILED);
2437                         goto err;
2438                         }
2439                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2440                                         (unsigned char *)enc_pms.data, enc_pms.length))
2441                         {
2442                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2443                                 SSL_R_DECRYPTION_FAILED);
2444                         goto err;
2445                         }
2446                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2447                         {
2448                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2449                                 SSL_R_DATA_LENGTH_TOO_LONG);
2450                         goto err;
2451                         }
2452                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2453                         {
2454                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2455                                 SSL_R_DECRYPTION_FAILED);
2456                         goto err;
2457                         }
2458                 outl += padl;
2459                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2460                         {
2461                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2462                                 SSL_R_DATA_LENGTH_TOO_LONG);
2463                         goto err;
2464                         }
2465                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2466                     {
2467                     /* The premaster secret must contain the same version number as the
2468                      * ClientHello to detect version rollback attacks (strangely, the
2469                      * protocol does not offer such protection for DH ciphersuites).
2470                      * However, buggy clients exist that send random bytes instead of
2471                      * the protocol version.
2472                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2473                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2474                      */
2475                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2476                         {
2477                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2478                                SSL_AD_DECODE_ERROR);
2479                         goto err;
2480                         }
2481                     }
2482
2483                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2484
2485                 s->session->master_key_length=
2486                         s->method->ssl3_enc->generate_master_secret(s,
2487                                 s->session->master_key, pms, outl);
2488
2489                 if (kssl_ctx->client_princ)
2490                         {
2491                         size_t len = strlen(kssl_ctx->client_princ);
2492                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2493                                 {
2494                                 s->session->krb5_client_princ_len = len;
2495                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2496                                 }
2497                         }
2498
2499
2500                 /*  Was doing kssl_ctx_free() here,
2501                 **  but it caused problems for apache.
2502                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2503                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2504                 */
2505                 }
2506         else
2507 #endif  /* OPENSSL_NO_KRB5 */
2508
2509 #ifndef OPENSSL_NO_ECDH
2510                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2511                 {
2512                 int ret = 1;
2513                 int field_size = 0;
2514                 const EC_KEY   *tkey;
2515                 const EC_GROUP *group;
2516                 const BIGNUM *priv_key;
2517
2518                 /* initialize structures for server's ECDH key pair */
2519                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2520                         {
2521                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2522                             ERR_R_MALLOC_FAILURE);
2523                         goto err;
2524                         }
2525
2526                 /* Let's get server private key and group information */
2527                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2528                         { 
2529                         /* use the certificate */
2530                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2531                         }
2532                 else
2533                         {
2534                         /* use the ephermeral values we saved when
2535                          * generating the ServerKeyExchange msg.
2536                          */
2537                         tkey = s->s3->tmp.ecdh;
2538                         }
2539
2540                 group    = EC_KEY_get0_group(tkey);
2541                 priv_key = EC_KEY_get0_private_key(tkey);
2542
2543                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2544                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2545                         {
2546                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2547                                ERR_R_EC_LIB);
2548                         goto err;
2549                         }
2550
2551                 /* Let's get client's public key */
2552                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2553                         {
2554                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2555                             ERR_R_MALLOC_FAILURE);
2556                         goto err;
2557                         }
2558
2559                 if (n == 0L) 
2560                         {
2561                         /* Client Publickey was in Client Certificate */
2562
2563                          if (alg_k & SSL_kEECDH)
2564                                  {
2565                                  al=SSL_AD_HANDSHAKE_FAILURE;
2566                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2567                                  goto f_err;
2568                                  }
2569                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2570                             == NULL) || 
2571                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2572                                 {
2573                                 /* XXX: For now, we do not support client
2574                                  * authentication using ECDH certificates
2575                                  * so this branch (n == 0L) of the code is
2576                                  * never executed. When that support is
2577                                  * added, we ought to ensure the key 
2578                                  * received in the certificate is 
2579                                  * authorized for key agreement.
2580                                  * ECDH_compute_key implicitly checks that
2581                                  * the two ECDH shares are for the same
2582                                  * group.
2583                                  */
2584                                 al=SSL_AD_HANDSHAKE_FAILURE;
2585                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2586                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2587                                 goto f_err;
2588                                 }
2589
2590                         if (EC_POINT_copy(clnt_ecpoint,
2591                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2592                                 {
2593                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2594                                         ERR_R_EC_LIB);
2595                                 goto err;
2596                                 }
2597                         ret = 2; /* Skip certificate verify processing */
2598                         }
2599                 else
2600                         {
2601                         /* Get client's public key from encoded point
2602                          * in the ClientKeyExchange message.
2603                          */
2604                         if ((bn_ctx = BN_CTX_new()) == NULL)
2605                                 {
2606                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2607                                     ERR_R_MALLOC_FAILURE);
2608                                 goto err;
2609                                 }
2610
2611                         /* Get encoded point length */
2612                         i = *p; 
2613                         p += 1;
2614                         if (EC_POINT_oct2point(group, 
2615                             clnt_ecpoint, p, i, bn_ctx) == 0)
2616                                 {
2617                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2618                                     ERR_R_EC_LIB);
2619                                 goto err;
2620                                 }
2621                         /* p is pointing to somewhere in the buffer
2622                          * currently, so set it to the start 
2623                          */ 
2624                         p=(unsigned char *)s->init_buf->data;
2625                         }
2626
2627                 /* Compute the shared pre-master secret */
2628                 field_size = EC_GROUP_get_degree(group);
2629                 if (field_size <= 0)
2630                         {
2631                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2632                                ERR_R_ECDH_LIB);
2633                         goto err;
2634                         }
2635                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2636                 if (i <= 0)
2637                         {
2638                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2639                             ERR_R_ECDH_LIB);
2640                         goto err;
2641                         }
2642
2643                 EVP_PKEY_free(clnt_pub_pkey);
2644                 EC_POINT_free(clnt_ecpoint);
2645                 EC_KEY_free(srvr_ecdh);
2646                 BN_CTX_free(bn_ctx);
2647                 EC_KEY_free(s->s3->tmp.ecdh);
2648                 s->s3->tmp.ecdh = NULL; 
2649
2650                 /* Compute the master secret */
2651                 s->session->master_key_length = s->method->ssl3_enc-> \
2652                     generate_master_secret(s, s->session->master_key, p, i);
2653                 
2654                 OPENSSL_cleanse(p, i);
2655                 return (ret);
2656                 }
2657         else
2658 #endif
2659 #ifndef OPENSSL_NO_PSK
2660                 if (alg_k & SSL_kPSK)
2661                         {
2662                         unsigned char *t = NULL;
2663                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2664                         unsigned int pre_ms_len = 0, psk_len = 0;
2665                         int psk_err = 1;
2666                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2667
2668                         al=SSL_AD_HANDSHAKE_FAILURE;
2669
2670                         n2s(p,i);
2671                         if (n != i+2)
2672                                 {
2673                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2674                                         SSL_R_LENGTH_MISMATCH);
2675                                 goto psk_err;
2676                                 }
2677                         if (i > PSK_MAX_IDENTITY_LEN)
2678                                 {
2679                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2680                                         SSL_R_DATA_LENGTH_TOO_LONG);
2681                                 goto psk_err;
2682                                 }
2683                         if (s->psk_server_callback == NULL)
2684                                 {
2685                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2686                                        SSL_R_PSK_NO_SERVER_CB);
2687                                 goto psk_err;
2688                                 }
2689
2690                         /* Create guaranteed NULL-terminated identity
2691                          * string for the callback */
2692                         memcpy(tmp_id, p, i);
2693                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2694                         psk_len = s->psk_server_callback(s, tmp_id,
2695                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2696                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2697
2698                         if (psk_len > PSK_MAX_PSK_LEN)
2699                                 {
2700                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2701                                         ERR_R_INTERNAL_ERROR);
2702                                 goto psk_err;
2703                                 }
2704                         else if (psk_len == 0)
2705                                 {
2706                                 /* PSK related to the given identity not found */
2707                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2708                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2709                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2710                                 goto psk_err;
2711                                 }
2712
2713                         /* create PSK pre_master_secret */
2714                         pre_ms_len=2+psk_len+2+psk_len;
2715                         t = psk_or_pre_ms;
2716                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2717                         s2n(psk_len, t);
2718                         memset(t, 0, psk_len);
2719                         t+=psk_len;
2720                         s2n(psk_len, t);
2721
2722                         if (s->session->psk_identity != NULL)
2723                                 OPENSSL_free(s->session->psk_identity);
2724                         s->session->psk_identity = BUF_strdup((char *)p);
2725                         if (s->session->psk_identity == NULL)
2726                                 {
2727                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2728                                         ERR_R_MALLOC_FAILURE);
2729                                 goto psk_err;
2730                                 }
2731
2732                         if (s->session->psk_identity_hint != NULL)
2733                                 OPENSSL_free(s->session->psk_identity_hint);
2734                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2735                         if (s->ctx->psk_identity_hint != NULL &&
2736                                 s->session->psk_identity_hint == NULL)
2737                                 {
2738                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2739                                         ERR_R_MALLOC_FAILURE);
2740                                 goto psk_err;
2741                                 }
2742
2743                         s->session->master_key_length=
2744                                 s->method->ssl3_enc->generate_master_secret(s,
2745                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2746                         psk_err = 0;
2747                 psk_err:
2748                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2749                         if (psk_err != 0)
2750                                 goto f_err;
2751                         }
2752                 else
2753 #endif
2754 #ifndef OPENSSL_NO_SRP
2755                 if (alg_k & SSL_kSRP)
2756                         {
2757                         int param_len;
2758
2759                         n2s(p,i);
2760                         param_len=i+2;
2761                         if (param_len > n)
2762                                 {
2763                                 al=SSL_AD_DECODE_ERROR;
2764                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2765                                 goto f_err;
2766                                 }
2767                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2768                                 {
2769                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2770                                 goto err;
2771                                 }
2772                         if (s->session->srp_username != NULL)
2773                                 OPENSSL_free(s->session->srp_username);
2774                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2775                         if (s->session->srp_username == NULL)
2776                                 {
2777                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2778                                         ERR_R_MALLOC_FAILURE);
2779                                 goto err;
2780                                 }
2781
2782                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2783                                 {
2784                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2785                                 goto err;
2786                                 }
2787
2788                         p+=i;
2789                         }
2790                 else
2791 #endif  /* OPENSSL_NO_SRP */
2792                 if (alg_k & SSL_kGOST) 
2793                         {
2794                         int ret = 0;
2795                         EVP_PKEY_CTX *pkey_ctx;
2796                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2797                         unsigned char premaster_secret[32], *start;
2798                         size_t outlen=32, inlen;
2799                         unsigned long alg_a;
2800
2801                         /* Get our certificate private key*/
2802                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2803                         if (alg_a & SSL_aGOST94)
2804                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2805                         else if (alg_a & SSL_aGOST01)
2806                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2807
2808                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2809                         EVP_PKEY_decrypt_init(pkey_ctx);
2810                         /* If client certificate is present and is of the same type, maybe
2811                          * use it for key exchange.  Don't mind errors from
2812                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2813                          * a client certificate for authorization only. */
2814                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2815                         if (client_pub_pkey)
2816                                 {
2817                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2818                                         ERR_clear_error();
2819                                 }
2820                         /* Decrypt session key */
2821                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2822                                 {
2823                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2824                                 goto gerr;
2825                                 }
2826                         if (p[1] == 0x81)
2827                                 {
2828                                 start = p+3;
2829                                 inlen = p[2];
2830                                 }
2831                         else if (p[1] < 0x80)
2832                                 {
2833                                 start = p+2;
2834                                 inlen = p[1];
2835                                 }
2836                         else
2837                                 {
2838                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2839                                 goto gerr;
2840                                 }
2841                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2842
2843                                 {
2844                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2845                                 goto gerr;
2846                                 }
2847                         /* Generate master secret */
2848                         s->session->master_key_length=
2849                                 s->method->ssl3_enc->generate_master_secret(s,
2850                                         s->session->master_key,premaster_secret,32);
2851                         /* Check if pubkey from client certificate was used */
2852                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2853                                 ret = 2;
2854                         else
2855                                 ret = 1;
2856                 gerr:
2857                         EVP_PKEY_free(client_pub_pkey);
2858                         EVP_PKEY_CTX_free(pkey_ctx);
2859                         if (ret)
2860                                 return ret;
2861                         else
2862                                 goto err;
2863                         }
2864                 else
2865                 {
2866                 al=SSL_AD_HANDSHAKE_FAILURE;
2867                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2868                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2869                 goto f_err;
2870                 }
2871
2872         return(1);
2873 f_err:
2874         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2875 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2876 err:
2877 #endif
2878 #ifndef OPENSSL_NO_ECDH
2879         EVP_PKEY_free(clnt_pub_pkey);
2880         EC_POINT_free(clnt_ecpoint);
2881         if (srvr_ecdh != NULL) 
2882                 EC_KEY_free(srvr_ecdh);
2883         BN_CTX_free(bn_ctx);
2884 #endif
2885         return(-1);
2886         }
2887
2888 int ssl3_get_cert_verify(SSL *s)
2889         {
2890         EVP_PKEY *pkey=NULL;
2891         unsigned char *p;
2892         int al,ok,ret=0;
2893         long n;
2894         int type=0,i,j;
2895         X509 *peer;
2896         const EVP_MD *md = NULL;
2897         EVP_MD_CTX mctx;
2898         EVP_MD_CTX_init(&mctx);
2899
2900         n=s->method->ssl_get_message(s,
2901                 SSL3_ST_SR_CERT_VRFY_A,
2902                 SSL3_ST_SR_CERT_VRFY_B,
2903                 -1,
2904                 514, /* 514? */
2905                 &ok);
2906
2907         if (!ok) return((int)n);
2908
2909         if (s->session->peer != NULL)
2910                 {
2911                 peer=s->session->peer;
2912                 pkey=X509_get_pubkey(peer);
2913                 type=X509_certificate_type(peer,pkey);
2914                 }
2915         else
2916                 {
2917                 peer=NULL;
2918                 pkey=NULL;
2919                 }
2920
2921         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2922                 {
2923                 s->s3->tmp.reuse_message=1;
2924                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2925                         {
2926                         al=SSL_AD_UNEXPECTED_MESSAGE;
2927                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2928                         goto f_err;
2929                         }
2930                 ret=1;
2931                 goto end;
2932                 }
2933
2934         if (peer == NULL)
2935                 {
2936                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2937                 al=SSL_AD_UNEXPECTED_MESSAGE;
2938                 goto f_err;
2939                 }
2940
2941         if (!(type & EVP_PKT_SIGN))
2942                 {
2943                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2944                 al=SSL_AD_ILLEGAL_PARAMETER;
2945                 goto f_err;
2946                 }
2947