tap: Define TAP_MANUALMAKE; unbreak building
[dragonfly.git] / crypto / openssl / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include "ssl_locl.h"
156 #include "kssl_lcl.h"
157 #include <openssl/buffer.h>
158 #include <openssl/rand.h>
159 #include <openssl/objects.h>
160 #include <openssl/evp.h>
161 #include <openssl/hmac.h>
162 #include <openssl/x509.h>
163 #ifndef OPENSSL_NO_DH
164 #include <openssl/dh.h>
165 #endif
166 #include <openssl/bn.h>
167 #ifndef OPENSSL_NO_KRB5
168 #include <openssl/krb5_asn.h>
169 #endif
170 #include <openssl/md5.h>
171
172 static const SSL_METHOD *ssl3_get_server_method(int ver);
173
174 static const SSL_METHOD *ssl3_get_server_method(int ver)
175         {
176         if (ver == SSL3_VERSION)
177                 return(SSLv3_server_method());
178         else
179                 return(NULL);
180         }
181
182 #ifndef OPENSSL_NO_SRP
183 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
184         {
185         int ret = SSL_ERROR_NONE;
186
187         *al = SSL_AD_UNRECOGNIZED_NAME;
188
189         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
190             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
191                 {
192                 if(s->srp_ctx.login == NULL)
193                         {
194                         /* RFC 5054 says SHOULD reject, 
195                            we do so if There is no srp login name */
196                         ret = SSL3_AL_FATAL;
197                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
198                         }
199                 else
200                         {
201                         ret = SSL_srp_server_param_with_username(s,al);
202                         }
203                 }
204         return ret;
205         }
206 #endif
207
208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
209                         ssl3_accept,
210                         ssl_undefined_function,
211                         ssl3_get_server_method)
212
213 int ssl3_accept(SSL *s)
214         {
215         BUF_MEM *buf;
216         unsigned long alg_k,Time=(unsigned long)time(NULL);
217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
218         int ret= -1;
219         int new_state,state,skip=0;
220
221         RAND_add(&Time,sizeof(Time),0);
222         ERR_clear_error();
223         clear_sys_error();
224
225         if (s->info_callback != NULL)
226                 cb=s->info_callback;
227         else if (s->ctx->info_callback != NULL)
228                 cb=s->ctx->info_callback;
229
230         /* init things to blank */
231         s->in_handshake++;
232         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
233
234         if (s->cert == NULL)
235                 {
236                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
237                 return(-1);
238                 }
239
240 #ifndef OPENSSL_NO_HEARTBEATS
241         /* If we're awaiting a HeartbeatResponse, pretend we
242          * already got and don't await it anymore, because
243          * Heartbeats don't make sense during handshakes anyway.
244          */
245         if (s->tlsext_hb_pending)
246                 {
247                 s->tlsext_hb_pending = 0;
248                 s->tlsext_hb_seq++;
249                 }
250 #endif
251
252         for (;;)
253                 {
254                 state=s->state;
255
256                 switch (s->state)
257                         {
258                 case SSL_ST_RENEGOTIATE:
259                         s->renegotiate=1;
260                         /* s->state=SSL_ST_ACCEPT; */
261
262                 case SSL_ST_BEFORE:
263                 case SSL_ST_ACCEPT:
264                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
265                 case SSL_ST_OK|SSL_ST_ACCEPT:
266
267                         s->server=1;
268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
269
270                         if ((s->version>>8) != 3)
271                                 {
272                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
273                                 return -1;
274                                 }
275                         s->type=SSL_ST_ACCEPT;
276
277                         if (s->init_buf == NULL)
278                                 {
279                                 if ((buf=BUF_MEM_new()) == NULL)
280                                         {
281                                         ret= -1;
282                                         goto end;
283                                         }
284                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
285                                         {
286                                         ret= -1;
287                                         goto end;
288                                         }
289                                 s->init_buf=buf;
290                                 }
291
292                         if (!ssl3_setup_buffers(s))
293                                 {
294                                 ret= -1;
295                                 goto end;
296                                 }
297
298                         s->init_num=0;
299                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
300
301                         if (s->state != SSL_ST_RENEGOTIATE)
302                                 {
303                                 /* Ok, we now need to push on a buffering BIO so that
304                                  * the output is sent in a way that TCP likes :-)
305                                  */
306                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
307                                 
308                                 ssl3_init_finished_mac(s);
309                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
310                                 s->ctx->stats.sess_accept++;
311                                 }
312                         else if (!s->s3->send_connection_binding &&
313                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
314                                 {
315                                 /* Server attempting to renegotiate with
316                                  * client that doesn't support secure
317                                  * renegotiation.
318                                  */
319                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
320                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
321                                 ret = -1;
322                                 goto end;
323                                 }
324                         else
325                                 {
326                                 /* s->state == SSL_ST_RENEGOTIATE,
327                                  * we will just send a HelloRequest */
328                                 s->ctx->stats.sess_accept_renegotiate++;
329                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
330                                 }
331                         break;
332
333                 case SSL3_ST_SW_HELLO_REQ_A:
334                 case SSL3_ST_SW_HELLO_REQ_B:
335
336                         s->shutdown=0;
337                         ret=ssl3_send_hello_request(s);
338                         if (ret <= 0) goto end;
339                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
340                         s->state=SSL3_ST_SW_FLUSH;
341                         s->init_num=0;
342
343                         ssl3_init_finished_mac(s);
344                         break;
345
346                 case SSL3_ST_SW_HELLO_REQ_C:
347                         s->state=SSL_ST_OK;
348                         break;
349
350                 case SSL3_ST_SR_CLNT_HELLO_A:
351                 case SSL3_ST_SR_CLNT_HELLO_B:
352                 case SSL3_ST_SR_CLNT_HELLO_C:
353
354                         s->shutdown=0;
355                         if (s->rwstate != SSL_X509_LOOKUP)
356                         {
357                                 ret=ssl3_get_client_hello(s);
358                                 if (ret <= 0) goto end;
359                         }
360 #ifndef OPENSSL_NO_SRP
361                         {
362                         int al;
363                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
364                                         {
365                                         /* callback indicates firther work to be done */
366                                         s->rwstate=SSL_X509_LOOKUP;
367                                         goto end;
368                                         }
369                         if (ret != SSL_ERROR_NONE)
370                                 {
371                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);    
372                                 /* This is not really an error but the only means to
373                                    for a client to detect whether srp is supported. */
374                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)      
375                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);                     
376                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;                       
377                                 ret= -1;
378                                 goto end;       
379                                 }
380                         }
381 #endif          
382                         
383                         s->renegotiate = 2;
384                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
385                         s->init_num=0;
386                         break;
387
388                 case SSL3_ST_SW_SRVR_HELLO_A:
389                 case SSL3_ST_SW_SRVR_HELLO_B:
390                         ret=ssl3_send_server_hello(s);
391                         if (ret <= 0) goto end;
392 #ifndef OPENSSL_NO_TLSEXT
393                         if (s->hit)
394                                 {
395                                 if (s->tlsext_ticket_expected)
396                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
397                                 else
398                                         s->state=SSL3_ST_SW_CHANGE_A;
399                                 }
400 #else
401                         if (s->hit)
402                                         s->state=SSL3_ST_SW_CHANGE_A;
403 #endif
404                         else
405                                 s->state=SSL3_ST_SW_CERT_A;
406                         s->init_num=0;
407                         break;
408
409                 case SSL3_ST_SW_CERT_A:
410                 case SSL3_ST_SW_CERT_B:
411                         /* Check if it is anon DH or anon ECDH, */
412                         /* normal PSK or KRB5 or SRP */
413                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
414                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
415                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
416                                 {
417                                 ret=ssl3_send_server_certificate(s);
418                                 if (ret <= 0) goto end;
419 #ifndef OPENSSL_NO_TLSEXT
420                                 if (s->tlsext_status_expected)
421                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
422                                 else
423                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
424                                 }
425                         else
426                                 {
427                                 skip = 1;
428                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
429                                 }
430 #else
431                                 }
432                         else
433                                 skip=1;
434
435                         s->state=SSL3_ST_SW_KEY_EXCH_A;
436 #endif
437                         s->init_num=0;
438                         break;
439
440                 case SSL3_ST_SW_KEY_EXCH_A:
441                 case SSL3_ST_SW_KEY_EXCH_B:
442                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
443
444                         /* clear this, it may get reset by
445                          * send_server_key_exchange */
446                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
447 #ifndef OPENSSL_NO_KRB5
448                                 && !(alg_k & SSL_kKRB5)
449 #endif /* OPENSSL_NO_KRB5 */
450                                 )
451                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
452                                  * even when forbidden by protocol specs
453                                  * (handshake may fail as clients are not required to
454                                  * be able to handle this) */
455                                 s->s3->tmp.use_rsa_tmp=1;
456                         else
457                                 s->s3->tmp.use_rsa_tmp=0;
458
459
460                         /* only send if a DH key exchange, fortezza or
461                          * RSA but we have a sign only certificate
462                          *
463                          * PSK: may send PSK identity hints
464                          *
465                          * For ECC ciphersuites, we send a serverKeyExchange
466                          * message only if the cipher suite is either
467                          * ECDH-anon or ECDHE. In other cases, the
468                          * server certificate contains the server's
469                          * public key for key exchange.
470                          */
471                         if (s->s3->tmp.use_rsa_tmp
472                         /* PSK: send ServerKeyExchange if PSK identity
473                          * hint if provided */
474 #ifndef OPENSSL_NO_PSK
475                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
476 #endif
477 #ifndef OPENSSL_NO_SRP
478                             /* SRP: send ServerKeyExchange */
479                             || (alg_k & SSL_kSRP)
480 #endif
481                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
482                             || (alg_k & SSL_kEECDH)
483                             || ((alg_k & SSL_kRSA)
484                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
485                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
486                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
487                                         )
488                                     )
489                                 )
490                             )
491                                 {
492                                 ret=ssl3_send_server_key_exchange(s);
493                                 if (ret <= 0) goto end;
494                                 }
495                         else
496                                 skip=1;
497
498                         s->state=SSL3_ST_SW_CERT_REQ_A;
499                         s->init_num=0;
500                         break;
501
502                 case SSL3_ST_SW_CERT_REQ_A:
503                 case SSL3_ST_SW_CERT_REQ_B:
504                         if (/* don't request cert unless asked for it: */
505                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
506                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
507                                  * don't request cert during re-negotiation: */
508                                 ((s->session->peer != NULL) &&
509                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
510                                 /* never request cert in anonymous ciphersuites
511                                  * (see section "Certificate request" in SSL 3 drafts
512                                  * and in RFC 2246): */
513                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
514                                  /* ... except when the application insists on verification
515                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
516                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
517                                  /* never request cert in Kerberos ciphersuites */
518                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
519                                 /* With normal PSK Certificates and
520                                  * Certificate Requests are omitted */
521                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
522                                 {
523                                 /* no cert request */
524                                 skip=1;
525                                 s->s3->tmp.cert_request=0;
526                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
527                                 if (s->s3->handshake_buffer)
528                                         if (!ssl3_digest_cached_records(s))
529                                                 return -1;
530                                 }
531                         else
532                                 {
533                                 s->s3->tmp.cert_request=1;
534                                 ret=ssl3_send_certificate_request(s);
535                                 if (ret <= 0) goto end;
536 #ifndef NETSCAPE_HANG_BUG
537                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
538 #else
539                                 s->state=SSL3_ST_SW_FLUSH;
540                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
541 #endif
542                                 s->init_num=0;
543                                 }
544                         break;
545
546                 case SSL3_ST_SW_SRVR_DONE_A:
547                 case SSL3_ST_SW_SRVR_DONE_B:
548                         ret=ssl3_send_server_done(s);
549                         if (ret <= 0) goto end;
550                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
551                         s->state=SSL3_ST_SW_FLUSH;
552                         s->init_num=0;
553                         break;
554                 
555                 case SSL3_ST_SW_FLUSH:
556
557                         /* This code originally checked to see if
558                          * any data was pending using BIO_CTRL_INFO
559                          * and then flushed. This caused problems
560                          * as documented in PR#1939. The proposed
561                          * fix doesn't completely resolve this issue
562                          * as buggy implementations of BIO_CTRL_PENDING
563                          * still exist. So instead we just flush
564                          * unconditionally.
565                          */
566
567                         s->rwstate=SSL_WRITING;
568                         if (BIO_flush(s->wbio) <= 0)
569                                 {
570                                 ret= -1;
571                                 goto end;
572                                 }
573                         s->rwstate=SSL_NOTHING;
574
575                         s->state=s->s3->tmp.next_state;
576                         break;
577
578                 case SSL3_ST_SR_CERT_A:
579                 case SSL3_ST_SR_CERT_B:
580                         /* Check for second client hello (MS SGC) */
581                         ret = ssl3_check_client_hello(s);
582                         if (ret <= 0)
583                                 goto end;
584                         if (ret == 2)
585                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
586                         else {
587                                 if (s->s3->tmp.cert_request)
588                                         {
589                                         ret=ssl3_get_client_certificate(s);
590                                         if (ret <= 0) goto end;
591                                         }
592                                 s->init_num=0;
593                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
594                         }
595                         break;
596
597                 case SSL3_ST_SR_KEY_EXCH_A:
598                 case SSL3_ST_SR_KEY_EXCH_B:
599                         ret=ssl3_get_client_key_exchange(s);
600                         if (ret <= 0)
601                                 goto end;
602                         if (ret == 2)
603                                 {
604                                 /* For the ECDH ciphersuites when
605                                  * the client sends its ECDH pub key in
606                                  * a certificate, the CertificateVerify
607                                  * message is not sent.
608                                  * Also for GOST ciphersuites when
609                                  * the client uses its key from the certificate
610                                  * for key exchange.
611                                  */
612 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
613                                 s->state=SSL3_ST_SR_FINISHED_A;
614 #else
615                                 if (s->s3->next_proto_neg_seen)
616                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
617                                 else
618                                         s->state=SSL3_ST_SR_FINISHED_A;
619 #endif
620                                 s->init_num = 0;
621                                 }
622                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
623                                 {
624                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
625                                 s->init_num=0;
626                                 if (!s->session->peer)
627                                         break;
628                                 /* For TLS v1.2 freeze the handshake buffer
629                                  * at this point and digest cached records.
630                                  */
631                                 if (!s->s3->handshake_buffer)
632                                         {
633                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
634                                         return -1;
635                                         }
636                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
637                                 if (!ssl3_digest_cached_records(s))
638                                         return -1;
639                                 }
640                         else
641                                 {
642                                 int offset=0;
643                                 int dgst_num;
644
645                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
646                                 s->init_num=0;
647
648                                 /* We need to get hashes here so if there is
649                                  * a client cert, it can be verified
650                                  * FIXME - digest processing for CertificateVerify
651                                  * should be generalized. But it is next step
652                                  */
653                                 if (s->s3->handshake_buffer)
654                                         if (!ssl3_digest_cached_records(s))
655                                                 return -1;
656                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
657                                         if (s->s3->handshake_dgst[dgst_num]) 
658                                                 {
659                                                 int dgst_size;
660
661                                                 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]));
662                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
663                                                 if (dgst_size < 0)
664                                                         {
665                                                         ret = -1;
666                                                         goto end;
667                                                         }
668                                                 offset+=dgst_size;
669                                                 }               
670                                 }
671                         break;
672
673                 case SSL3_ST_SR_CERT_VRFY_A:
674                 case SSL3_ST_SR_CERT_VRFY_B:
675
676                         /* we should decide if we expected this one */
677                         ret=ssl3_get_cert_verify(s);
678                         if (ret <= 0) goto end;
679
680 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
681                         s->state=SSL3_ST_SR_FINISHED_A;
682 #else
683                         if (s->s3->next_proto_neg_seen)
684                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
685                         else
686                                 s->state=SSL3_ST_SR_FINISHED_A;
687 #endif
688                         s->init_num=0;
689                         break;
690
691 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
692                 case SSL3_ST_SR_NEXT_PROTO_A:
693                 case SSL3_ST_SR_NEXT_PROTO_B:
694                         ret=ssl3_get_next_proto(s);
695                         if (ret <= 0) goto end;
696                         s->init_num = 0;
697                         s->state=SSL3_ST_SR_FINISHED_A;
698                         break;
699 #endif
700
701                 case SSL3_ST_SR_FINISHED_A:
702                 case SSL3_ST_SR_FINISHED_B:
703                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
704                                 SSL3_ST_SR_FINISHED_B);
705                         if (ret <= 0) goto end;
706                         if (s->hit)
707                                 s->state=SSL_ST_OK;
708 #ifndef OPENSSL_NO_TLSEXT
709                         else if (s->tlsext_ticket_expected)
710                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
711 #endif
712                         else
713                                 s->state=SSL3_ST_SW_CHANGE_A;
714                         s->init_num=0;
715                         break;
716
717 #ifndef OPENSSL_NO_TLSEXT
718                 case SSL3_ST_SW_SESSION_TICKET_A:
719                 case SSL3_ST_SW_SESSION_TICKET_B:
720                         ret=ssl3_send_newsession_ticket(s);
721                         if (ret <= 0) goto end;
722                         s->state=SSL3_ST_SW_CHANGE_A;
723                         s->init_num=0;
724                         break;
725
726                 case SSL3_ST_SW_CERT_STATUS_A:
727                 case SSL3_ST_SW_CERT_STATUS_B:
728                         ret=ssl3_send_cert_status(s);
729                         if (ret <= 0) goto end;
730                         s->state=SSL3_ST_SW_KEY_EXCH_A;
731                         s->init_num=0;
732                         break;
733
734 #endif
735
736                 case SSL3_ST_SW_CHANGE_A:
737                 case SSL3_ST_SW_CHANGE_B:
738
739                         s->session->cipher=s->s3->tmp.new_cipher;
740                         if (!s->method->ssl3_enc->setup_key_block(s))
741                                 { ret= -1; goto end; }
742
743                         ret=ssl3_send_change_cipher_spec(s,
744                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
745
746                         if (ret <= 0) goto end;
747                         s->state=SSL3_ST_SW_FINISHED_A;
748                         s->init_num=0;
749
750                         if (!s->method->ssl3_enc->change_cipher_state(s,
751                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
752                                 {
753                                 ret= -1;
754                                 goto end;
755                                 }
756
757                         break;
758
759                 case SSL3_ST_SW_FINISHED_A:
760                 case SSL3_ST_SW_FINISHED_B:
761                         ret=ssl3_send_finished(s,
762                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
763                                 s->method->ssl3_enc->server_finished_label,
764                                 s->method->ssl3_enc->server_finished_label_len);
765                         if (ret <= 0) goto end;
766                         s->state=SSL3_ST_SW_FLUSH;
767                         if (s->hit)
768                                 {
769 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
770                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
771 #else
772                                 if (s->s3->next_proto_neg_seen)
773                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
774                                 else
775                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
776 #endif
777                                 }
778                         else
779                                 s->s3->tmp.next_state=SSL_ST_OK;
780                         s->init_num=0;
781                         break;
782
783                 case SSL_ST_OK:
784                         /* clean a few things up */
785                         ssl3_cleanup_key_block(s);
786
787                         BUF_MEM_free(s->init_buf);
788                         s->init_buf=NULL;
789
790                         /* remove buffering on output */
791                         ssl_free_wbio_buffer(s);
792
793                         s->init_num=0;
794
795                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
796                                 {
797                                 s->renegotiate=0;
798                                 s->new_session=0;
799                                 
800                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
801                                 
802                                 s->ctx->stats.sess_accept_good++;
803                                 /* s->server=1; */
804                                 s->handshake_func=ssl3_accept;
805
806                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
807                                 }
808                         
809                         ret = 1;
810                         goto end;
811                         /* break; */
812
813                 default:
814                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
815                         ret= -1;
816                         goto end;
817                         /* break; */
818                         }
819                 
820                 if (!s->s3->tmp.reuse_message && !skip)
821                         {
822                         if (s->debug)
823                                 {
824                                 if ((ret=BIO_flush(s->wbio)) <= 0)
825                                         goto end;
826                                 }
827
828
829                         if ((cb != NULL) && (s->state != state))
830                                 {
831                                 new_state=s->state;
832                                 s->state=state;
833                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
834                                 s->state=new_state;
835                                 }
836                         }
837                 skip=0;
838                 }
839 end:
840         /* BIO_flush(s->wbio); */
841
842         s->in_handshake--;
843         if (cb != NULL)
844                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
845         return(ret);
846         }
847
848 int ssl3_send_hello_request(SSL *s)
849         {
850         unsigned char *p;
851
852         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
853                 {
854                 p=(unsigned char *)s->init_buf->data;
855                 *(p++)=SSL3_MT_HELLO_REQUEST;
856                 *(p++)=0;
857                 *(p++)=0;
858                 *(p++)=0;
859
860                 s->state=SSL3_ST_SW_HELLO_REQ_B;
861                 /* number of bytes to write */
862                 s->init_num=4;
863                 s->init_off=0;
864                 }
865
866         /* SSL3_ST_SW_HELLO_REQ_B */
867         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
868         }
869
870 int ssl3_check_client_hello(SSL *s)
871         {
872         int ok;
873         long n;
874
875         /* this function is called when we really expect a Certificate message,
876          * so permit appropriate message length */
877         n=s->method->ssl_get_message(s,
878                 SSL3_ST_SR_CERT_A,
879                 SSL3_ST_SR_CERT_B,
880                 -1,
881                 s->max_cert_list,
882                 &ok);
883         if (!ok) return((int)n);
884         s->s3->tmp.reuse_message = 1;
885         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
886                 {
887                 /* We only allow the client to restart the handshake once per
888                  * negotiation. */
889                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
890                         {
891                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
892                         return -1;
893                         }
894                 /* Throw away what we have done so far in the current handshake,
895                  * which will now be aborted. (A full SSL_clear would be too much.) */
896 #ifndef OPENSSL_NO_DH
897                 if (s->s3->tmp.dh != NULL)
898                         {
899                         DH_free(s->s3->tmp.dh);
900                         s->s3->tmp.dh = NULL;
901                         }
902 #endif
903 #ifndef OPENSSL_NO_ECDH
904                 if (s->s3->tmp.ecdh != NULL)
905                         {
906                         EC_KEY_free(s->s3->tmp.ecdh);
907                         s->s3->tmp.ecdh = NULL;
908                         }
909 #endif
910                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
911                 return 2;
912                 }
913         return 1;
914 }
915
916 int ssl3_get_client_hello(SSL *s)
917         {
918         int i,j,ok,al,ret= -1;
919         unsigned int cookie_len;
920         long n;
921         unsigned long id;
922         unsigned char *p,*d,*q;
923         SSL_CIPHER *c;
924 #ifndef OPENSSL_NO_COMP
925         SSL_COMP *comp=NULL;
926 #endif
927         STACK_OF(SSL_CIPHER) *ciphers=NULL;
928
929         /* We do this so that we will respond with our native type.
930          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
931          * This down switching should be handled by a different method.
932          * If we are SSLv3, we will respond with SSLv3, even if prompted with
933          * TLSv1.
934          */
935         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
936                 )
937                 {
938                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
939                 }
940         s->first_packet=1;
941         n=s->method->ssl_get_message(s,
942                 SSL3_ST_SR_CLNT_HELLO_B,
943                 SSL3_ST_SR_CLNT_HELLO_C,
944                 SSL3_MT_CLIENT_HELLO,
945                 SSL3_RT_MAX_PLAIN_LENGTH,
946                 &ok);
947
948         if (!ok) return((int)n);
949         s->first_packet=0;
950         d=p=(unsigned char *)s->init_msg;
951
952         /* use version from inside client hello, not from record header
953          * (may differ: see RFC 2246, Appendix E, second paragraph) */
954         s->client_version=(((int)p[0])<<8)|(int)p[1];
955         p+=2;
956
957         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
958             (s->version != DTLS1_VERSION && s->client_version < s->version))
959                 {
960                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
961                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
962                         {
963                         /* similar to ssl3_get_record, send alert using remote version number */
964                         s->version = s->client_version;
965                         }
966                 al = SSL_AD_PROTOCOL_VERSION;
967                 goto f_err;
968                 }
969
970         /* If we require cookies and this ClientHello doesn't
971          * contain one, just return since we do not want to
972          * allocate any memory yet. So check cookie length...
973          */
974         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
975                 {
976                 unsigned int session_length, cookie_length;
977                 
978                 session_length = *(p + SSL3_RANDOM_SIZE);
979                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
980
981                 if (cookie_length == 0)
982                         return 1;
983                 }
984
985         /* load the client random */
986         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
987         p+=SSL3_RANDOM_SIZE;
988
989         /* get the session-id */
990         j= *(p++);
991
992         s->hit=0;
993         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
994          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
995          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
996          * than a change to default behavior so that applications relying on this for security
997          * won't even compile against older library versions).
998          *
999          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1000          * renegotiation but not a new session (s->new_session remains unset): for servers,
1001          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1002          * setting will be ignored.
1003          */
1004         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1005                 {
1006                 if (!ssl_get_new_session(s,1))
1007                         goto err;
1008                 }
1009         else
1010                 {
1011                 i=ssl_get_prev_session(s, p, j, d + n);
1012                 if (i == 1)
1013                         { /* previous session */
1014                         s->hit=1;
1015                         }
1016                 else if (i == -1)
1017                         goto err;
1018                 else /* i == 0 */
1019                         {
1020                         if (!ssl_get_new_session(s,1))
1021                                 goto err;
1022                         }
1023                 }
1024
1025         p+=j;
1026
1027         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1028                 {
1029                 /* cookie stuff */
1030                 cookie_len = *(p++);
1031
1032                 /* 
1033                  * The ClientHello may contain a cookie even if the
1034                  * HelloVerify message has not been sent--make sure that it
1035                  * does not cause an overflow.
1036                  */
1037                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1038                         {
1039                         /* too much data */
1040                         al = SSL_AD_DECODE_ERROR;
1041                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1042                         goto f_err;
1043                         }
1044
1045                 /* verify the cookie if appropriate option is set. */
1046                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1047                         cookie_len > 0)
1048                         {
1049                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1050
1051                         if ( s->ctx->app_verify_cookie_cb != NULL)
1052                                 {
1053                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1054                                         cookie_len) == 0)
1055                                         {
1056                                         al=SSL_AD_HANDSHAKE_FAILURE;
1057                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1058                                                 SSL_R_COOKIE_MISMATCH);
1059                                         goto f_err;
1060                                         }
1061                                 /* else cookie verification succeeded */
1062                                 }
1063                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1064                                                   s->d1->cookie_len) != 0) /* default verification */
1065                                 {
1066                                         al=SSL_AD_HANDSHAKE_FAILURE;
1067                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1068                                                 SSL_R_COOKIE_MISMATCH);
1069                                         goto f_err;
1070                                 }
1071
1072                         ret = 2;
1073                         }
1074
1075                 p += cookie_len;
1076                 }
1077
1078         n2s(p,i);
1079         if ((i == 0) && (j != 0))
1080                 {
1081                 /* we need a cipher if we are not resuming a session */
1082                 al=SSL_AD_ILLEGAL_PARAMETER;
1083                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1084                 goto f_err;
1085                 }
1086         if ((p+i) >= (d+n))
1087                 {
1088                 /* not enough data */
1089                 al=SSL_AD_DECODE_ERROR;
1090                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1091                 goto f_err;
1092                 }
1093         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1094                 == NULL))
1095                 {
1096                 goto err;
1097                 }
1098         p+=i;
1099
1100         /* If it is a hit, check that the cipher is in the list */
1101         if ((s->hit) && (i > 0))
1102                 {
1103                 j=0;
1104                 id=s->session->cipher->id;
1105
1106 #ifdef CIPHER_DEBUG
1107                 printf("client sent %d ciphers\n",sk_num(ciphers));
1108 #endif
1109                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1110                         {
1111                         c=sk_SSL_CIPHER_value(ciphers,i);
1112 #ifdef CIPHER_DEBUG
1113                         printf("client [%2d of %2d]:%s\n",
1114                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1115 #endif
1116                         if (c->id == id)
1117                                 {
1118                                 j=1;
1119                                 break;
1120                                 }
1121                         }
1122 /* Disabled because it can be used in a ciphersuite downgrade
1123  * attack: CVE-2010-4180.
1124  */
1125 #if 0
1126                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1127                         {
1128                         /* Special case as client bug workaround: the previously used cipher may
1129                          * not be in the current list, the client instead might be trying to
1130                          * continue using a cipher that before wasn't chosen due to server
1131                          * preferences.  We'll have to reject the connection if the cipher is not
1132                          * enabled, though. */
1133                         c = sk_SSL_CIPHER_value(ciphers, 0);
1134                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1135                                 {
1136                                 s->session->cipher = c;
1137                                 j = 1;
1138                                 }
1139                         }
1140 #endif
1141                 if (j == 0)
1142                         {
1143                         /* we need to have the cipher in the cipher
1144                          * list if we are asked to reuse it */
1145                         al=SSL_AD_ILLEGAL_PARAMETER;
1146                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1147                         goto f_err;
1148                         }
1149                 }
1150
1151         /* compression */
1152         i= *(p++);
1153         if ((p+i) > (d+n))
1154                 {
1155                 /* not enough data */
1156                 al=SSL_AD_DECODE_ERROR;
1157                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1158                 goto f_err;
1159                 }
1160         q=p;
1161         for (j=0; j<i; j++)
1162                 {
1163                 if (p[j] == 0) break;
1164                 }
1165
1166         p+=i;
1167         if (j >= i)
1168                 {
1169                 /* no compress */
1170                 al=SSL_AD_DECODE_ERROR;
1171                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1172                 goto f_err;
1173                 }
1174
1175 #ifndef OPENSSL_NO_TLSEXT
1176         /* TLS extensions*/
1177         if (s->version >= SSL3_VERSION)
1178                 {
1179                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1180                         {
1181                         /* 'al' set by ssl_parse_clienthello_tlsext */
1182                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1183                         goto f_err;
1184                         }
1185                 }
1186                 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1187                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1188                         goto err;
1189                 }
1190
1191         /* Check if we want to use external pre-shared secret for this
1192          * handshake for not reused session only. We need to generate
1193          * server_random before calling tls_session_secret_cb in order to allow
1194          * SessionTicket processing to use it in key derivation. */
1195         {
1196                 unsigned long Time;
1197                 unsigned char *pos;
1198                 Time=(unsigned long)time(NULL);                 /* Time */
1199                 pos=s->s3->server_random;
1200                 l2n(Time,pos);
1201                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1202                         {
1203                         al=SSL_AD_INTERNAL_ERROR;
1204                         goto f_err;
1205                         }
1206         }
1207
1208         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1209                 {
1210                 SSL_CIPHER *pref_cipher=NULL;
1211
1212                 s->session->master_key_length=sizeof(s->session->master_key);
1213                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1214                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1215                         {
1216                         s->hit=1;
1217                         s->session->ciphers=ciphers;
1218                         s->session->verify_result=X509_V_OK;
1219
1220                         ciphers=NULL;
1221
1222                         /* check if some cipher was preferred by call back */
1223                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1224                         if (pref_cipher == NULL)
1225                                 {
1226                                 al=SSL_AD_HANDSHAKE_FAILURE;
1227                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1228                                 goto f_err;
1229                                 }
1230
1231                         s->session->cipher=pref_cipher;
1232
1233                         if (s->cipher_list)
1234                                 sk_SSL_CIPHER_free(s->cipher_list);
1235
1236                         if (s->cipher_list_by_id)
1237                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1238
1239                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1240                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1241                         }
1242                 }
1243 #endif
1244
1245         /* Worst case, we will use the NULL compression, but if we have other
1246          * options, we will now look for them.  We have i-1 compression
1247          * algorithms from the client, starting at q. */
1248         s->s3->tmp.new_compression=NULL;
1249 #ifndef OPENSSL_NO_COMP
1250         /* This only happens if we have a cache hit */
1251         if (s->session->compress_meth != 0)
1252                 {
1253                 int m, comp_id = s->session->compress_meth;
1254                 /* Perform sanity checks on resumed compression algorithm */
1255                 /* Can't disable compression */
1256                 if (s->options & SSL_OP_NO_COMPRESSION)
1257                         {
1258                         al=SSL_AD_INTERNAL_ERROR;
1259                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1260                         goto f_err;
1261                         }
1262                 /* Look for resumed compression method */
1263                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1264                         {
1265                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1266                         if (comp_id == comp->id)
1267                                 {
1268                                 s->s3->tmp.new_compression=comp;
1269                                 break;
1270                                 }
1271                         }
1272                 if (s->s3->tmp.new_compression == NULL)
1273                         {
1274                         al=SSL_AD_INTERNAL_ERROR;
1275                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1276                         goto f_err;
1277                         }
1278                 /* Look for resumed method in compression list */
1279                 for (m = 0; m < i; m++)
1280                         {
1281                         if (q[m] == comp_id)
1282                                 break;
1283                         }
1284                 if (m >= i)
1285                         {
1286                         al=SSL_AD_ILLEGAL_PARAMETER;
1287                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1288                         goto f_err;
1289                         }
1290                 }
1291         else if (s->hit)
1292                 comp = NULL;
1293         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1294                 { /* See if we have a match */
1295                 int m,nn,o,v,done=0;
1296
1297                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1298                 for (m=0; m<nn; m++)
1299                         {
1300                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1301                         v=comp->id;
1302                         for (o=0; o<i; o++)
1303                                 {
1304                                 if (v == q[o])
1305                                         {
1306                                         done=1;
1307                                         break;
1308                                         }
1309                                 }
1310                         if (done) break;
1311                         }
1312                 if (done)
1313                         s->s3->tmp.new_compression=comp;
1314                 else
1315                         comp=NULL;
1316                 }
1317 #else
1318         /* If compression is disabled we'd better not try to resume a session
1319          * using compression.
1320          */
1321         if (s->session->compress_meth != 0)
1322                 {
1323                 al=SSL_AD_INTERNAL_ERROR;
1324                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1325                 goto f_err;
1326                 }
1327 #endif
1328
1329         /* Given s->session->ciphers and SSL_get_ciphers, we must
1330          * pick a cipher */
1331
1332         if (!s->hit)
1333                 {
1334 #ifdef OPENSSL_NO_COMP
1335                 s->session->compress_meth=0;
1336 #else
1337                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1338 #endif
1339                 if (s->session->ciphers != NULL)
1340                         sk_SSL_CIPHER_free(s->session->ciphers);
1341                 s->session->ciphers=ciphers;
1342                 if (ciphers == NULL)
1343                         {
1344                         al=SSL_AD_ILLEGAL_PARAMETER;
1345                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1346                         goto f_err;
1347                         }
1348                 ciphers=NULL;
1349                 c=ssl3_choose_cipher(s,s->session->ciphers,
1350                                      SSL_get_ciphers(s));
1351
1352                 if (c == NULL)
1353                         {
1354                         al=SSL_AD_HANDSHAKE_FAILURE;
1355                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1356                         goto f_err;
1357                         }
1358                 s->s3->tmp.new_cipher=c;
1359                 }
1360         else
1361                 {
1362                 /* Session-id reuse */
1363 #ifdef REUSE_CIPHER_BUG
1364                 STACK_OF(SSL_CIPHER) *sk;
1365                 SSL_CIPHER *nc=NULL;
1366                 SSL_CIPHER *ec=NULL;
1367
1368                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1369                         {
1370                         sk=s->session->ciphers;
1371                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1372                                 {
1373                                 c=sk_SSL_CIPHER_value(sk,i);
1374                                 if (c->algorithm_enc & SSL_eNULL)
1375                                         nc=c;
1376                                 if (SSL_C_IS_EXPORT(c))
1377                                         ec=c;
1378                                 }
1379                         if (nc != NULL)
1380                                 s->s3->tmp.new_cipher=nc;
1381                         else if (ec != NULL)
1382                                 s->s3->tmp.new_cipher=ec;
1383                         else
1384                                 s->s3->tmp.new_cipher=s->session->cipher;
1385                         }
1386                 else
1387 #endif
1388                 s->s3->tmp.new_cipher=s->session->cipher;
1389                 }
1390
1391         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1392                 {
1393                 if (!ssl3_digest_cached_records(s))
1394                         goto f_err;
1395                 }
1396         
1397         /* we now have the following setup. 
1398          * client_random
1399          * cipher_list          - our prefered list of ciphers
1400          * ciphers              - the clients prefered list of ciphers
1401          * compression          - basically ignored right now
1402          * ssl version is set   - sslv3
1403          * s->session           - The ssl session has been setup.
1404          * s->hit               - session reuse flag
1405          * s->tmp.new_cipher    - the new cipher to use.
1406          */
1407
1408         /* Handles TLS extensions that we couldn't check earlier */
1409         if (s->version >= SSL3_VERSION)
1410                 {
1411                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1412                         {
1413                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1414                         goto err;
1415                         }
1416                 }
1417
1418         if (ret < 0) ret=1;
1419         if (0)
1420                 {
1421 f_err:
1422                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1423                 }
1424 err:
1425         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1426         return(ret);
1427         }
1428
1429 int ssl3_send_server_hello(SSL *s)
1430         {
1431         unsigned char *buf;
1432         unsigned char *p,*d;
1433         int i,sl;
1434         unsigned long l;
1435 #ifdef OPENSSL_NO_TLSEXT
1436         unsigned long Time;
1437 #endif
1438
1439         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1440                 {
1441                 buf=(unsigned char *)s->init_buf->data;
1442 #ifdef OPENSSL_NO_TLSEXT
1443                 p=s->s3->server_random;
1444                 /* Generate server_random if it was not needed previously */
1445                 Time=(unsigned long)time(NULL);                 /* Time */
1446                 l2n(Time,p);
1447                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1448                         return -1;
1449 #endif
1450                 /* Do the message type and length last */
1451                 d=p= &(buf[4]);
1452
1453                 *(p++)=s->version>>8;
1454                 *(p++)=s->version&0xff;
1455
1456                 /* Random stuff */
1457                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1458                 p+=SSL3_RANDOM_SIZE;
1459
1460                 /* There are several cases for the session ID to send
1461                  * back in the server hello:
1462                  * - For session reuse from the session cache,
1463                  *   we send back the old session ID.
1464                  * - If stateless session reuse (using a session ticket)
1465                  *   is successful, we send back the client's "session ID"
1466                  *   (which doesn't actually identify the session).
1467                  * - If it is a new session, we send back the new
1468                  *   session ID.
1469                  * - However, if we want the new session to be single-use,
1470                  *   we send back a 0-length session ID.
1471                  * s->hit is non-zero in either case of session reuse,
1472                  * so the following won't overwrite an ID that we're supposed
1473                  * to send back.
1474                  */
1475                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1476                         && !s->hit)
1477                         s->session->session_id_length=0;
1478
1479                 sl=s->session->session_id_length;
1480                 if (sl > (int)sizeof(s->session->session_id))
1481                         {
1482                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1483                         return -1;
1484                         }
1485                 *(p++)=sl;
1486                 memcpy(p,s->session->session_id,sl);
1487                 p+=sl;
1488
1489                 /* put the cipher */
1490                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1491                 p+=i;
1492
1493                 /* put the compression method */
1494 #ifdef OPENSSL_NO_COMP
1495                         *(p++)=0;
1496 #else
1497                 if (s->s3->tmp.new_compression == NULL)
1498                         *(p++)=0;
1499                 else
1500                         *(p++)=s->s3->tmp.new_compression->id;
1501 #endif
1502 #ifndef OPENSSL_NO_TLSEXT
1503                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1504                         {
1505                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1506                         return -1;
1507                         }
1508                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1509                         {
1510                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1511                         return -1;
1512                         }
1513 #endif
1514                 /* do the header */
1515                 l=(p-d);
1516                 d=buf;
1517                 *(d++)=SSL3_MT_SERVER_HELLO;
1518                 l2n3(l,d);
1519
1520                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1521                 /* number of bytes to write */
1522                 s->init_num=p-buf;
1523                 s->init_off=0;
1524                 }
1525
1526         /* SSL3_ST_SW_SRVR_HELLO_B */
1527         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1528         }
1529
1530 int ssl3_send_server_done(SSL *s)
1531         {
1532         unsigned char *p;
1533
1534         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1535                 {
1536                 p=(unsigned char *)s->init_buf->data;
1537
1538                 /* do the header */
1539                 *(p++)=SSL3_MT_SERVER_DONE;
1540                 *(p++)=0;
1541                 *(p++)=0;
1542                 *(p++)=0;
1543
1544                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1545                 /* number of bytes to write */
1546                 s->init_num=4;
1547                 s->init_off=0;
1548                 }
1549
1550         /* SSL3_ST_SW_SRVR_DONE_B */
1551         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1552         }
1553
1554 int ssl3_send_server_key_exchange(SSL *s)
1555         {
1556 #ifndef OPENSSL_NO_RSA
1557         unsigned char *q;
1558         int j,num;
1559         RSA *rsa;
1560         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1561         unsigned int u;
1562 #endif
1563 #ifndef OPENSSL_NO_DH
1564         DH *dh=NULL,*dhp;
1565 #endif
1566 #ifndef OPENSSL_NO_ECDH
1567         EC_KEY *ecdh=NULL, *ecdhp;
1568         unsigned char *encodedPoint = NULL;
1569         int encodedlen = 0;
1570         int curve_id = 0;
1571         BN_CTX *bn_ctx = NULL; 
1572 #endif
1573         EVP_PKEY *pkey;
1574         const EVP_MD *md = NULL;
1575         unsigned char *p,*d;
1576         int al,i;
1577         unsigned long type;
1578         int n;
1579         CERT *cert;
1580         BIGNUM *r[4];
1581         int nr[4],kn;
1582         BUF_MEM *buf;
1583         EVP_MD_CTX md_ctx;
1584
1585         EVP_MD_CTX_init(&md_ctx);
1586         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1587                 {
1588                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1589                 cert=s->cert;
1590
1591                 buf=s->init_buf;
1592
1593                 r[0]=r[1]=r[2]=r[3]=NULL;
1594                 n=0;
1595 #ifndef OPENSSL_NO_RSA
1596                 if (type & SSL_kRSA)
1597                         {
1598                         rsa=cert->rsa_tmp;
1599                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1600                                 {
1601                                 rsa=s->cert->rsa_tmp_cb(s,
1602                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1603                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1604                                 if(rsa == NULL)
1605                                 {
1606                                         al=SSL_AD_HANDSHAKE_FAILURE;
1607                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1608                                         goto f_err;
1609                                 }
1610                                 RSA_up_ref(rsa);
1611                                 cert->rsa_tmp=rsa;
1612                                 }
1613                         if (rsa == NULL)
1614                                 {
1615                                 al=SSL_AD_HANDSHAKE_FAILURE;
1616                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1617                                 goto f_err;
1618                                 }
1619                         r[0]=rsa->n;
1620                         r[1]=rsa->e;
1621                         s->s3->tmp.use_rsa_tmp=1;
1622                         }
1623                 else
1624 #endif
1625 #ifndef OPENSSL_NO_DH
1626                         if (type & SSL_kEDH)
1627                         {
1628                         dhp=cert->dh_tmp;
1629                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1630                                 dhp=s->cert->dh_tmp_cb(s,
1631                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1632                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1633                         if (dhp == NULL)
1634                                 {
1635                                 al=SSL_AD_HANDSHAKE_FAILURE;
1636                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1637                                 goto f_err;
1638                                 }
1639
1640                         if (s->s3->tmp.dh != NULL)
1641                                 {
1642                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1643                                 goto err;
1644                                 }
1645
1646                         if ((dh=DHparams_dup(dhp)) == NULL)
1647                                 {
1648                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1649                                 goto err;
1650                                 }
1651
1652                         s->s3->tmp.dh=dh;
1653                         if ((dhp->pub_key == NULL ||
1654                              dhp->priv_key == NULL ||
1655                              (s->options & SSL_OP_SINGLE_DH_USE)))
1656                                 {
1657                                 if(!DH_generate_key(dh))
1658                                     {
1659                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1660                                            ERR_R_DH_LIB);
1661                                     goto err;
1662                                     }
1663                                 }
1664                         else
1665                                 {
1666                                 dh->pub_key=BN_dup(dhp->pub_key);
1667                                 dh->priv_key=BN_dup(dhp->priv_key);
1668                                 if ((dh->pub_key == NULL) ||
1669                                         (dh->priv_key == NULL))
1670                                         {
1671                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1672                                         goto err;
1673                                         }
1674                                 }
1675                         r[0]=dh->p;
1676                         r[1]=dh->g;
1677                         r[2]=dh->pub_key;
1678                         }
1679                 else 
1680 #endif
1681 #ifndef OPENSSL_NO_ECDH
1682                         if (type & SSL_kEECDH)
1683                         {
1684                         const EC_GROUP *group;
1685
1686                         ecdhp=cert->ecdh_tmp;
1687                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1688                                 {
1689                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1690                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1691                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1692                                 }
1693                         if (ecdhp == NULL)
1694                                 {
1695                                 al=SSL_AD_HANDSHAKE_FAILURE;
1696                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1697                                 goto f_err;
1698                                 }
1699
1700                         if (s->s3->tmp.ecdh != NULL)
1701                                 {
1702                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1703                                 goto err;
1704                                 }
1705
1706                         /* Duplicate the ECDH structure. */
1707                         if (ecdhp == NULL)
1708                                 {
1709                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1710                                 goto err;
1711                                 }
1712                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1713                                 {
1714                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1715                                 goto err;
1716                                 }
1717
1718                         s->s3->tmp.ecdh=ecdh;
1719                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1720                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1721                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1722                                 {
1723                                 if(!EC_KEY_generate_key(ecdh))
1724                                     {
1725                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1726                                     goto err;
1727                                     }
1728                                 }
1729
1730                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1731                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1732                             (EC_KEY_get0_private_key(ecdh) == NULL))
1733                                 {
1734                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1735                                 goto err;
1736                                 }
1737
1738                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1739                             (EC_GROUP_get_degree(group) > 163)) 
1740                                 {
1741                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1742                                 goto err;
1743                                 }
1744
1745                         /* XXX: For now, we only support ephemeral ECDH
1746                          * keys over named (not generic) curves. For 
1747                          * supported named curves, curve_id is non-zero.
1748                          */
1749                         if ((curve_id = 
1750                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1751                             == 0)
1752                                 {
1753                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1754                                 goto err;
1755                                 }
1756
1757                         /* Encode the public key.
1758                          * First check the size of encoding and
1759                          * allocate memory accordingly.
1760                          */
1761                         encodedlen = EC_POINT_point2oct(group, 
1762                             EC_KEY_get0_public_key(ecdh),
1763                             POINT_CONVERSION_UNCOMPRESSED, 
1764                             NULL, 0, NULL);
1765
1766                         encodedPoint = (unsigned char *) 
1767                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1768                         bn_ctx = BN_CTX_new();
1769                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1770                                 {
1771                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1772                                 goto err;
1773                                 }
1774
1775
1776                         encodedlen = EC_POINT_point2oct(group, 
1777                             EC_KEY_get0_public_key(ecdh), 
1778                             POINT_CONVERSION_UNCOMPRESSED, 
1779                             encodedPoint, encodedlen, bn_ctx);
1780
1781                         if (encodedlen == 0) 
1782                                 {
1783                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1784                                 goto err;
1785                                 }
1786
1787                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1788
1789                         /* XXX: For now, we only support named (not 
1790                          * generic) curves in ECDH ephemeral key exchanges.
1791                          * In this situation, we need four additional bytes
1792                          * to encode the entire ServerECDHParams
1793                          * structure. 
1794                          */
1795                         n = 4 + encodedlen;
1796
1797                         /* We'll generate the serverKeyExchange message
1798                          * explicitly so we can set these to NULLs
1799                          */
1800                         r[0]=NULL;
1801                         r[1]=NULL;
1802                         r[2]=NULL;
1803                         r[3]=NULL;
1804                         }
1805                 else 
1806 #endif /* !OPENSSL_NO_ECDH */
1807 #ifndef OPENSSL_NO_PSK
1808                         if (type & SSL_kPSK)
1809                                 {
1810                                 /* reserve size for record length and PSK identity hint*/
1811                                 n+=2+strlen(s->ctx->psk_identity_hint);
1812                                 }
1813                         else
1814 #endif /* !OPENSSL_NO_PSK */
1815 #ifndef OPENSSL_NO_SRP
1816                 if (type & SSL_kSRP)
1817                         {
1818                         if ((s->srp_ctx.N == NULL) ||
1819                                 (s->srp_ctx.g == NULL) ||
1820                                 (s->srp_ctx.s == NULL) ||
1821                                 (s->srp_ctx.B == NULL))
1822                                 {
1823                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1824                                 goto err;
1825                                 }
1826                         r[0]=s->srp_ctx.N;
1827                         r[1]=s->srp_ctx.g;
1828                         r[2]=s->srp_ctx.s;
1829                         r[3]=s->srp_ctx.B;
1830                         }
1831                 else 
1832 #endif
1833                         {
1834                         al=SSL_AD_HANDSHAKE_FAILURE;
1835                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1836                         goto f_err;
1837                         }
1838                 for (i=0; r[i] != NULL && i<4; i++)
1839                         {
1840                         nr[i]=BN_num_bytes(r[i]);
1841 #ifndef OPENSSL_NO_SRP
1842                         if ((i == 2) && (type & SSL_kSRP))
1843                                 n+=1+nr[i];
1844                         else
1845 #endif
1846                         n+=2+nr[i];
1847                         }
1848
1849                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1850                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1851                         {
1852                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1853                                 == NULL)
1854                                 {
1855                                 al=SSL_AD_DECODE_ERROR;
1856                                 goto f_err;
1857                                 }
1858                         kn=EVP_PKEY_size(pkey);
1859                         }
1860                 else
1861                         {
1862                         pkey=NULL;
1863                         kn=0;
1864                         }
1865
1866                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1867                         {
1868                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1869                         goto err;
1870                         }
1871                 d=(unsigned char *)s->init_buf->data;
1872                 p= &(d[4]);
1873
1874                 for (i=0; r[i] != NULL && i<4; i++)
1875                         {
1876 #ifndef OPENSSL_NO_SRP
1877                         if ((i == 2) && (type & SSL_kSRP))
1878                                 {
1879                                 *p = nr[i];
1880                                 p++;
1881                                 }
1882                         else
1883 #endif
1884                         s2n(nr[i],p);
1885                         BN_bn2bin(r[i],p);
1886                         p+=nr[i];
1887                         }
1888
1889 #ifndef OPENSSL_NO_ECDH
1890                 if (type & SSL_kEECDH) 
1891                         {
1892                         /* XXX: For now, we only support named (not generic) curves.
1893                          * In this situation, the serverKeyExchange message has:
1894                          * [1 byte CurveType], [2 byte CurveName]
1895                          * [1 byte length of encoded point], followed by
1896                          * the actual encoded point itself
1897                          */
1898                         *p = NAMED_CURVE_TYPE;
1899                         p += 1;
1900                         *p = 0;
1901                         p += 1;
1902                         *p = curve_id;
1903                         p += 1;
1904                         *p = encodedlen;
1905                         p += 1;
1906                         memcpy((unsigned char*)p, 
1907                             (unsigned char *)encodedPoint, 
1908                             encodedlen);
1909                         OPENSSL_free(encodedPoint);
1910                         encodedPoint = NULL;
1911                         p += encodedlen;
1912                         }
1913 #endif
1914
1915 #ifndef OPENSSL_NO_PSK
1916                 if (type & SSL_kPSK)
1917                         {
1918                         /* copy PSK identity hint */
1919                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1920                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1921                         p+=strlen(s->ctx->psk_identity_hint);
1922                         }
1923 #endif
1924
1925                 /* not anonymous */
1926                 if (pkey != NULL)
1927                         {
1928                         /* n is the length of the params, they start at &(d[4])
1929                          * and p points to the space at the end. */
1930 #ifndef OPENSSL_NO_RSA
1931                         if (pkey->type == EVP_PKEY_RSA
1932                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1933                                 {
1934                                 q=md_buf;
1935                                 j=0;
1936                                 for (num=2; num > 0; num--)
1937                                         {
1938                                         EVP_MD_CTX_set_flags(&md_ctx,
1939                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1940                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1941                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1942                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1943                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1944                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1945                                         EVP_DigestFinal_ex(&md_ctx,q,
1946                                                 (unsigned int *)&i);
1947                                         q+=i;
1948                                         j+=i;
1949                                         }
1950                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1951                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1952                                         {
1953                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1954                                         goto err;
1955                                         }
1956                                 s2n(u,p);
1957                                 n+=u+2;
1958                                 }
1959                         else
1960 #endif
1961                         if (md)
1962                                 {
1963                                 /* For TLS1.2 and later send signature
1964                                  * algorithm */
1965                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1966                                         {
1967                                         if (!tls12_get_sigandhash(p, pkey, md))
1968                                                 {
1969                                                 /* Should never happen */
1970                                                 al=SSL_AD_INTERNAL_ERROR;
1971                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1972                                                 goto f_err;
1973                                                 }
1974                                         p+=2;
1975                                         }
1976 #ifdef SSL_DEBUG
1977                                 fprintf(stderr, "Using hash %s\n",
1978                                                         EVP_MD_name(md));
1979 #endif
1980                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1981                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1982                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1983                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1984                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1985                                         (unsigned int *)&i,pkey))
1986                                         {
1987                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1988                                         goto err;
1989                                         }
1990                                 s2n(i,p);
1991                                 n+=i+2;
1992                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1993                                         n+= 2;
1994                                 }
1995                         else
1996                                 {
1997                                 /* Is this error check actually needed? */
1998                                 al=SSL_AD_HANDSHAKE_FAILURE;
1999                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2000                                 goto f_err;
2001                                 }
2002                         }
2003
2004                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2005                 l2n3(n,d);
2006
2007                 /* we should now have things packed up, so lets send
2008                  * it off */
2009                 s->init_num=n+4;
2010                 s->init_off=0;
2011                 }
2012
2013         s->state = SSL3_ST_SW_KEY_EXCH_B;
2014         EVP_MD_CTX_cleanup(&md_ctx);
2015         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2016 f_err:
2017         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2018 err:
2019 #ifndef OPENSSL_NO_ECDH
2020         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2021         BN_CTX_free(bn_ctx);
2022 #endif
2023         EVP_MD_CTX_cleanup(&md_ctx);
2024         return(-1);
2025         }
2026
2027 int ssl3_send_certificate_request(SSL *s)
2028         {
2029         unsigned char *p,*d;
2030         int i,j,nl,off,n;
2031         STACK_OF(X509_NAME) *sk=NULL;
2032         X509_NAME *name;
2033         BUF_MEM *buf;
2034
2035         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2036                 {
2037                 buf=s->init_buf;
2038
2039                 d=p=(unsigned char *)&(buf->data[4]);
2040
2041                 /* get the list of acceptable cert types */
2042                 p++;
2043                 n=ssl3_get_req_cert_type(s,p);
2044                 d[0]=n;
2045                 p+=n;
2046                 n++;
2047
2048                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2049                         {
2050                         nl = tls12_get_req_sig_algs(s, p + 2);
2051                         s2n(nl, p);
2052                         p += nl + 2;
2053                         n += nl + 2;
2054                         }
2055
2056                 off=n;
2057                 p+=2;
2058                 n+=2;
2059
2060                 sk=SSL_get_client_CA_list(s);
2061                 nl=0;
2062                 if (sk != NULL)
2063                         {
2064                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2065                                 {
2066                                 name=sk_X509_NAME_value(sk,i);
2067                                 j=i2d_X509_NAME(name,NULL);
2068                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2069                                         {
2070                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2071                                         goto err;
2072                                         }
2073                                 p=(unsigned char *)&(buf->data[4+n]);
2074                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2075                                         {
2076                                         s2n(j,p);
2077                                         i2d_X509_NAME(name,&p);
2078                                         n+=2+j;
2079                                         nl+=2+j;
2080                                         }
2081                                 else
2082                                         {
2083                                         d=p;
2084                                         i2d_X509_NAME(name,&p);
2085                                         j-=2; s2n(j,d); j+=2;
2086                                         n+=j;
2087                                         nl+=j;
2088                                         }
2089                                 }
2090                         }
2091                 /* else no CA names */
2092                 p=(unsigned char *)&(buf->data[4+off]);
2093                 s2n(nl,p);
2094
2095                 d=(unsigned char *)buf->data;
2096                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2097                 l2n3(n,d);
2098
2099                 /* we should now have things packed up, so lets send
2100                  * it off */
2101
2102                 s->init_num=n+4;
2103                 s->init_off=0;
2104 #ifdef NETSCAPE_HANG_BUG
2105                 p=(unsigned char *)s->init_buf->data + s->init_num;
2106
2107                 /* do the header */
2108                 *(p++)=SSL3_MT_SERVER_DONE;
2109                 *(p++)=0;
2110                 *(p++)=0;
2111                 *(p++)=0;
2112                 s->init_num += 4;
2113 #endif
2114
2115                 s->state = SSL3_ST_SW_CERT_REQ_B;
2116                 }
2117
2118         /* SSL3_ST_SW_CERT_REQ_B */
2119         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2120 err:
2121         return(-1);
2122         }
2123
2124 int ssl3_get_client_key_exchange(SSL *s)
2125         {
2126         int i,al,ok;
2127         long n;
2128         unsigned long alg_k;
2129         unsigned char *p;
2130 #ifndef OPENSSL_NO_RSA
2131         RSA *rsa=NULL;
2132         EVP_PKEY *pkey=NULL;
2133 #endif
2134 #ifndef OPENSSL_NO_DH
2135         BIGNUM *pub=NULL;
2136         DH *dh_srvr;
2137 #endif
2138 #ifndef OPENSSL_NO_KRB5
2139         KSSL_ERR kssl_err;
2140 #endif /* OPENSSL_NO_KRB5 */
2141
2142 #ifndef OPENSSL_NO_ECDH
2143         EC_KEY *srvr_ecdh = NULL;
2144         EVP_PKEY *clnt_pub_pkey = NULL;
2145         EC_POINT *clnt_ecpoint = NULL;
2146         BN_CTX *bn_ctx = NULL; 
2147 #endif
2148
2149         n=s->method->ssl_get_message(s,
2150                 SSL3_ST_SR_KEY_EXCH_A,
2151                 SSL3_ST_SR_KEY_EXCH_B,
2152                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2153                 2048, /* ??? */
2154                 &ok);
2155
2156         if (!ok) return((int)n);
2157         p=(unsigned char *)s->init_msg;
2158
2159         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2160
2161 #ifndef OPENSSL_NO_RSA
2162         if (alg_k & SSL_kRSA)
2163                 {
2164                 /* FIX THIS UP EAY EAY EAY EAY */
2165                 if (s->s3->tmp.use_rsa_tmp)
2166                         {
2167                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2168                                 rsa=s->cert->rsa_tmp;
2169                         /* Don't do a callback because rsa_tmp should
2170                          * be sent already */
2171                         if (rsa == NULL)
2172                                 {
2173                                 al=SSL_AD_HANDSHAKE_FAILURE;
2174                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2175                                 goto f_err;
2176
2177                                 }
2178                         }
2179                 else
2180                         {
2181                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2182                         if (    (pkey == NULL) ||
2183                                 (pkey->type != EVP_PKEY_RSA) ||
2184                                 (pkey->pkey.rsa == NULL))
2185                                 {
2186                                 al=SSL_AD_HANDSHAKE_FAILURE;
2187                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2188                                 goto f_err;
2189                                 }
2190                         rsa=pkey->pkey.rsa;
2191                         }
2192
2193                 /* TLS and [incidentally] DTLS{0xFEFF} */
2194                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2195                         {
2196                         n2s(p,i);
2197                         if (n != i+2)
2198                                 {
2199                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2200                                         {
2201                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2202                                         goto err;
2203                                         }
2204                                 else
2205                                         p-=2;
2206                                 }
2207                         else
2208                                 n=i;
2209                         }
2210
2211                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2212
2213                 al = -1;
2214                 
2215                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2216                         {
2217                         al=SSL_AD_DECODE_ERROR;
2218                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2219                         }
2220
2221                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2222                         {
2223                         /* The premaster secret must contain the same version number as the
2224                          * ClientHello to detect version rollback attacks (strangely, the
2225                          * protocol does not offer such protection for DH ciphersuites).
2226                          * However, buggy clients exist that send the negotiated protocol
2227                          * version instead if the server does not support the requested
2228                          * protocol version.
2229                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2230                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2231                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2232                                 {
2233                                 al=SSL_AD_DECODE_ERROR;
2234                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2235
2236                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2237                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2238                                  * number check as a "bad version oracle" -- an alert would
2239                                  * reveal that the plaintext corresponding to some ciphertext
2240                                  * made up by the adversary is properly formatted except
2241                                  * that the version number is wrong.  To avoid such attacks,
2242                                  * we should treat this just like any other decryption error. */
2243                                 }
2244                         }
2245
2246                 if (al != -1)
2247                         {
2248                         /* Some decryption failure -- use random value instead as countermeasure
2249                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2250                          * (see RFC 2246, section 7.4.7.1). */
2251                         ERR_clear_error();
2252                         i = SSL_MAX_MASTER_KEY_LENGTH;
2253                         p[0] = s->client_version >> 8;
2254                         p[1] = s->client_version & 0xff;
2255                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2256                                 goto err;
2257                         }
2258         
2259                 s->session->master_key_length=
2260                         s->method->ssl3_enc->generate_master_secret(s,
2261                                 s->session->master_key,
2262                                 p,i);
2263                 OPENSSL_cleanse(p,i);
2264                 }
2265         else
2266 #endif
2267 #ifndef OPENSSL_NO_DH
2268                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2269                 {
2270                 n2s(p,i);
2271                 if (n != i+2)
2272                         {
2273                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2274                                 {
2275                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2276                                 goto err;
2277                                 }
2278                         else
2279                                 {
2280                                 p-=2;
2281                                 i=(int)n;
2282                                 }
2283                         }
2284
2285                 if (n == 0L) /* the parameters are in the cert */
2286                         {
2287                         al=SSL_AD_HANDSHAKE_FAILURE;
2288                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2289                         goto f_err;
2290                         }
2291                 else
2292                         {
2293                         if (s->s3->tmp.dh == NULL)
2294                                 {
2295                                 al=SSL_AD_HANDSHAKE_FAILURE;
2296                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2297                                 goto f_err;
2298                                 }
2299                         else
2300                                 dh_srvr=s->s3->tmp.dh;
2301                         }
2302
2303                 pub=BN_bin2bn(p,i,NULL);
2304                 if (pub == NULL)
2305                         {
2306                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2307                         goto err;
2308                         }
2309
2310                 i=DH_compute_key(p,pub,dh_srvr);
2311
2312                 if (i <= 0)
2313                         {
2314                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2315                         BN_clear_free(pub);
2316                         goto err;
2317                         }
2318
2319                 DH_free(s->s3->tmp.dh);
2320                 s->s3->tmp.dh=NULL;
2321
2322                 BN_clear_free(pub);
2323                 pub=NULL;
2324                 s->session->master_key_length=
2325                         s->method->ssl3_enc->generate_master_secret(s,
2326                                 s->session->master_key,p,i);
2327                 OPENSSL_cleanse(p,i);
2328                 }
2329         else
2330 #endif
2331 #ifndef OPENSSL_NO_KRB5
2332         if (alg_k & SSL_kKRB5)
2333                 {
2334                 krb5_error_code         krb5rc;
2335                 krb5_data               enc_ticket;
2336                 krb5_data               authenticator;
2337                 krb5_data               enc_pms;
2338                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2339                 EVP_CIPHER_CTX          ciph_ctx;
2340                 const EVP_CIPHER        *enc = NULL;
2341                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2342                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2343                                                + EVP_MAX_BLOCK_LENGTH];
2344                 int                  padl, outl;
2345                 krb5_timestamp          authtime = 0;
2346                 krb5_ticket_times       ttimes;
2347
2348                 EVP_CIPHER_CTX_init(&ciph_ctx);
2349
2350                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2351
2352                 n2s(p,i);
2353                 enc_ticket.length = i;
2354
2355                 if (n < (long)(enc_ticket.length + 6))
2356                         {
2357                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2358                                 SSL_R_DATA_LENGTH_TOO_LONG);
2359                         goto err;
2360                         }
2361
2362                 enc_ticket.data = (char *)p;
2363                 p+=enc_ticket.length;
2364
2365                 n2s(p,i);
2366                 authenticator.length = i;
2367
2368                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2369                         {
2370                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2371                                 SSL_R_DATA_LENGTH_TOO_LONG);
2372                         goto err;
2373                         }
2374
2375                 authenticator.data = (char *)p;
2376                 p+=authenticator.length;
2377
2378                 n2s(p,i);
2379                 enc_pms.length = i;
2380                 enc_pms.data = (char *)p;
2381                 p+=enc_pms.length;
2382
2383                 /* Note that the length is checked again below,
2384                 ** after decryption
2385                 */
2386                 if(enc_pms.length > sizeof pms)
2387                         {
2388                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2389                                SSL_R_DATA_LENGTH_TOO_LONG);
2390                         goto err;
2391                         }
2392
2393                 if (n != (long)(enc_ticket.length + authenticator.length +
2394                                                 enc_pms.length + 6))
2395                         {
2396                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2397                                 SSL_R_DATA_LENGTH_TOO_LONG);
2398                         goto err;
2399                         }
2400
2401                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2402                                         &kssl_err)) != 0)
2403                         {
2404 #ifdef KSSL_DEBUG
2405                         printf("kssl_sget_tkt rtn %d [%d]\n",
2406                                 krb5rc, kssl_err.reason);
2407                         if (kssl_err.text)
2408                                 printf("kssl_err text= %s\n", kssl_err.text);
2409 #endif  /* KSSL_DEBUG */
2410                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2411                                 kssl_err.reason);
2412                         goto err;
2413                         }
2414
2415                 /*  Note: no authenticator is not considered an error,
2416                 **  but will return authtime == 0.
2417                 */
2418                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2419                                         &authtime, &kssl_err)) != 0)
2420                         {
2421 #ifdef KSSL_DEBUG
2422                         printf("kssl_check_authent rtn %d [%d]\n",
2423                                 krb5rc, kssl_err.reason);
2424                         if (kssl_err.text)
2425                                 printf("kssl_err text= %s\n", kssl_err.text);
2426 #endif  /* KSSL_DEBUG */
2427                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2428                                 kssl_err.reason);
2429                         goto err;
2430                         }
2431
2432                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2433                         {
2434                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2435                         goto err;
2436                         }
2437
2438 #ifdef KSSL_DEBUG
2439                 kssl_ctx_show(kssl_ctx);
2440 #endif  /* KSSL_DEBUG */
2441
2442                 enc = kssl_map_enc(kssl_ctx->enctype);
2443                 if (enc == NULL)
2444                     goto err;
2445
2446                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2447
2448                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2449                         {
2450                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2451                                 SSL_R_DECRYPTION_FAILED);
2452                         goto err;
2453                         }
2454                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2455                                         (unsigned char *)enc_pms.data, enc_pms.length))
2456                         {
2457                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2458                                 SSL_R_DECRYPTION_FAILED);
2459                         goto err;
2460                         }
2461                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2462                         {
2463                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2464                                 SSL_R_DATA_LENGTH_TOO_LONG);
2465                         goto err;
2466                         }
2467                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2468                         {
2469                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2470                                 SSL_R_DECRYPTION_FAILED);
2471                         goto err;
2472                         }
2473                 outl += padl;
2474                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2475                         {
2476                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2477                                 SSL_R_DATA_LENGTH_TOO_LONG);
2478                         goto err;
2479                         }
2480                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2481                     {
2482                     /* The premaster secret must contain the same version number as the
2483                      * ClientHello to detect version rollback attacks (strangely, the
2484                      * protocol does not offer such protection for DH ciphersuites).
2485                      * However, buggy clients exist that send random bytes instead of
2486                      * the protocol version.
2487                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2488                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2489                      */
2490                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2491                         {
2492                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2493                                SSL_AD_DECODE_ERROR);
2494                         goto err;
2495                         }
2496                     }
2497
2498                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2499
2500                 s->session->master_key_length=
2501                         s->method->ssl3_enc->generate_master_secret(s,
2502                                 s->session->master_key, pms, outl);
2503
2504                 if (kssl_ctx->client_princ)
2505                         {
2506                         size_t len = strlen(kssl_ctx->client_princ);
2507                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2508                                 {
2509                                 s->session->krb5_client_princ_len = len;
2510                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2511                                 }
2512                         }
2513
2514
2515                 /*  Was doing kssl_ctx_free() here,
2516                 **  but it caused problems for apache.
2517                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2518                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2519                 */
2520                 }
2521         else
2522 #endif  /* OPENSSL_NO_KRB5 */
2523
2524 #ifndef OPENSSL_NO_ECDH
2525                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2526                 {
2527                 int ret = 1;
2528                 int field_size = 0;
2529                 const EC_KEY   *tkey;
2530                 const EC_GROUP *group;
2531                 const BIGNUM *priv_key;
2532
2533                 /* initialize structures for server's ECDH key pair */
2534                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2535                         {
2536                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2537                             ERR_R_MALLOC_FAILURE);
2538                         goto err;
2539                         }
2540
2541                 /* Let's get server private key and group information */
2542                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2543                         { 
2544                         /* use the certificate */
2545                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2546                         }
2547                 else
2548                         {
2549                         /* use the ephermeral values we saved when
2550                          * generating the ServerKeyExchange msg.
2551                          */
2552                         tkey = s->s3->tmp.ecdh;
2553                         }
2554
2555                 group    = EC_KEY_get0_group(tkey);
2556                 priv_key = EC_KEY_get0_private_key(tkey);
2557
2558                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2559                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2560                         {
2561                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2562                                ERR_R_EC_LIB);
2563                         goto err;
2564                         }
2565
2566                 /* Let's get client's public key */
2567                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2568                         {
2569                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2570                             ERR_R_MALLOC_FAILURE);
2571                         goto err;
2572                         }
2573
2574                 if (n == 0L) 
2575                         {
2576                         /* Client Publickey was in Client Certificate */
2577
2578                          if (alg_k & SSL_kEECDH)
2579                                  {
2580                                  al=SSL_AD_HANDSHAKE_FAILURE;
2581                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2582                                  goto f_err;
2583                                  }
2584                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2585                             == NULL) || 
2586                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2587                                 {
2588                                 /* XXX: For now, we do not support client
2589                                  * authentication using ECDH certificates
2590                                  * so this branch (n == 0L) of the code is
2591                                  * never executed. When that support is
2592                                  * added, we ought to ensure the key 
2593                                  * received in the certificate is 
2594                                  * authorized for key agreement.
2595                                  * ECDH_compute_key implicitly checks that
2596                                  * the two ECDH shares are for the same
2597                                  * group.
2598                                  */
2599                                 al=SSL_AD_HANDSHAKE_FAILURE;
2600                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2601                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2602                                 goto f_err;
2603                                 }
2604
2605                         if (EC_POINT_copy(clnt_ecpoint,
2606                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2607                                 {
2608                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2609                                         ERR_R_EC_LIB);
2610                                 goto err;
2611                                 }
2612                         ret = 2; /* Skip certificate verify processing */
2613                         }
2614                 else
2615                         {
2616                         /* Get client's public key from encoded point
2617                          * in the ClientKeyExchange message.
2618                          */
2619                         if ((bn_ctx = BN_CTX_new()) == NULL)
2620                                 {
2621                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2622                                     ERR_R_MALLOC_FAILURE);
2623                                 goto err;
2624                                 }
2625
2626                         /* Get encoded point length */
2627                         i = *p; 
2628                         p += 1;
2629                         if (n != 1 + i)
2630                                 {
2631                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2632                                     ERR_R_EC_LIB);
2633                                 goto err;
2634                                 }
2635                         if (EC_POINT_oct2point(group, 
2636                             clnt_ecpoint, p, i, bn_ctx) == 0)
2637                                 {
2638                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2639                                     ERR_R_EC_LIB);
2640                                 goto err;
2641                                 }
2642                         /* p is pointing to somewhere in the buffer
2643                          * currently, so set it to the start 
2644                          */ 
2645                         p=(unsigned char *)s->init_buf->data;
2646                         }
2647
2648                 /* Compute the shared pre-master secret */
2649                 field_size = EC_GROUP_get_degree(group);
2650                 if (field_size <= 0)
2651                         {
2652                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2653                                ERR_R_ECDH_LIB);
2654                         goto err;
2655                         }
2656                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2657                 if (i <= 0)
2658                         {
2659                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2660                             ERR_R_ECDH_LIB);
2661                         goto err;
2662                         }
2663
2664                 EVP_PKEY_free(clnt_pub_pkey);
2665                 EC_POINT_free(clnt_ecpoint);
2666                 EC_KEY_free(srvr_ecdh);
2667                 BN_CTX_free(bn_ctx);
2668                 EC_KEY_free(s->s3->tmp.ecdh);
2669                 s->s3->tmp.ecdh = NULL; 
2670
2671                 /* Compute the master secret */
2672                 s->session->master_key_length = s->method->ssl3_enc-> \
2673                     generate_master_secret(s, s->session->master_key, p, i);
2674                 
2675                 OPENSSL_cleanse(p, i);
2676                 return (ret);
2677                 }
2678         else
2679 #endif
2680 #ifndef OPENSSL_NO_PSK
2681                 if (alg_k & SSL_kPSK)
2682                         {
2683                         unsigned char *t = NULL;
2684                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2685                         unsigned int pre_ms_len = 0, psk_len = 0;
2686                         int psk_err = 1;
2687                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2688
2689                         al=SSL_AD_HANDSHAKE_FAILURE;
2690
2691                         n2s(p,i);
2692                         if (n != i+2)
2693                                 {
2694                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2695                                         SSL_R_LENGTH_MISMATCH);
2696                                 goto psk_err;
2697                                 }
2698                         if (i > PSK_MAX_IDENTITY_LEN)
2699                                 {
2700                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2701                                         SSL_R_DATA_LENGTH_TOO_LONG);
2702                                 goto psk_err;
2703                                 }
2704                         if (s->psk_server_callback == NULL)
2705                                 {
2706                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2707                                        SSL_R_PSK_NO_SERVER_CB);
2708                                 goto psk_err;
2709                                 }
2710
2711                         /* Create guaranteed NULL-terminated identity
2712                          * string for the callback */
2713                         memcpy(tmp_id, p, i);
2714                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2715                         psk_len = s->psk_server_callback(s, tmp_id,
2716                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2717                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2718
2719                         if (psk_len > PSK_MAX_PSK_LEN)
2720                                 {
2721                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2722                                         ERR_R_INTERNAL_ERROR);
2723                                 goto psk_err;
2724                                 }
2725                         else if (psk_len == 0)
2726                                 {
2727                                 /* PSK related to the given identity not found */
2728                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2729                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2730                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2731                                 goto psk_err;
2732                                 }
2733
2734                         /* create PSK pre_master_secret */
2735                         pre_ms_len=2+psk_len+2+psk_len;
2736                         t = psk_or_pre_ms;
2737                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2738                         s2n(psk_len, t);
2739                         memset(t, 0, psk_len);
2740                         t+=psk_len;
2741                         s2n(psk_len, t);
2742
2743                         if (s->session->psk_identity != NULL)
2744                                 OPENSSL_free(s->session->psk_identity);
2745                         s->session->psk_identity = BUF_strdup((char *)p);
2746                         if (s->session->psk_identity == NULL)
2747                                 {
2748                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2749                                         ERR_R_MALLOC_FAILURE);
2750                                 goto psk_err;
2751                                 }
2752
2753                         if (s->session->psk_identity_hint != NULL)
2754                                 OPENSSL_free(s->session->psk_identity_hint);
2755                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2756                         if (s->ctx->psk_identity_hint != NULL &&
2757                                 s->session->psk_identity_hint == NULL)
2758                                 {
2759                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2760                                         ERR_R_MALLOC_FAILURE);
2761                                 goto psk_err;
2762                                 }
2763
2764                         s->session->master_key_length=
2765                                 s->method->ssl3_enc->generate_master_secret(s,
2766                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2767                         psk_err = 0;
2768                 psk_err:
2769                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2770                         if (psk_err != 0)
2771                                 goto f_err;
2772                         }
2773                 else
2774 #endif
2775 #ifndef OPENSSL_NO_SRP
2776                 if (alg_k & SSL_kSRP)
2777                         {
2778                         int param_len;
2779
2780                         n2s(p,i);
2781                         param_len=i+2;
2782                         if (param_len > n)
2783                                 {
2784                                 al=SSL_AD_DECODE_ERROR;
2785                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2786                                 goto f_err;
2787                                 }
2788                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2789                                 {
2790                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2791                                 goto err;
2792                                 }
2793                         if (s->session->srp_username != NULL)
2794                                 OPENSSL_free(s->session->srp_username);
2795                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2796                         if (s->session->srp_username == NULL)
2797                                 {
2798                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2799                                         ERR_R_MALLOC_FAILURE);
2800                                 goto err;
2801                                 }
2802
2803                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2804                                 {
2805                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2806                                 goto err;
2807                                 }
2808
2809                         p+=i;
2810                         }
2811                 else
2812 #endif  /* OPENSSL_NO_SRP */
2813                 if (alg_k & SSL_kGOST) 
2814                         {
2815                         int ret = 0;
2816                         EVP_PKEY_CTX *pkey_ctx;
2817                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2818                         unsigned char premaster_secret[32], *start;
2819                         size_t outlen=32, inlen;
2820                         unsigned long alg_a;
2821
2822                         /* Get our certificate private key*/
2823                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2824                         if (alg_a & SSL_aGOST94)
2825                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2826                         else if (alg_a & SSL_aGOST01)
2827                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2828
2829                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2830                         EVP_PKEY_decrypt_init(pkey_ctx);
2831                         /* If client certificate is present and is of the same type, maybe
2832                          * use it for key exchange.  Don't mind errors from
2833                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2834                          * a client certificate for authorization only. */
2835                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2836                         if (client_pub_pkey)
2837                                 {
2838                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2839                                         ERR_clear_error();
2840                                 }
2841                         /* Decrypt session key */
2842                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2843                                 {
2844                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2845                                 goto gerr;
2846                                 }
2847                         if (p[1] == 0x81)
2848                                 {
2849                                 start = p+3;
2850                                 inlen = p[2];
2851                                 }
2852                         else if (p[1] < 0x80)
2853                                 {
2854                                 start = p+2;
2855                                 inlen = p[1];
2856                                 }
2857                         else
2858                                 {
2859                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2860                                 goto gerr;
2861                                 }
2862                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2863
2864                                 {
2865                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2866                                 goto gerr;
2867                                 }
2868                         /* Generate master secret */
2869                         s->session->master_key_length=
2870                                 s->method->ssl3_enc->generate_master_secret(s,
2871                                         s->session->master_key,premaster_secret,32);
2872                         /* Check if pubkey from client certificate was used */
2873                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2874                                 ret = 2;
2875                         else
2876                                 ret = 1;
2877                 gerr:
2878                         EVP_PKEY_free(client_pub_pkey);
2879                         EVP_PKEY_CTX_free(pkey_ctx);
2880                         if (ret)
2881                                 return ret;
2882                         else
2883                                 goto err;
2884                         }
2885                 else
2886                 {
2887                 al=SSL_AD_HANDSHAKE_FAILURE;
2888                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2889                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2890                 goto f_err;
2891                 }
2892
2893         return(1);
2894 f_err:
2895         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2896 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2897 err:
2898 #endif
2899 #ifndef OPENSSL_NO_ECDH
2900         EVP_PKEY_free(clnt_pub_pkey);
2901         EC_POINT_free(clnt_ecpoint);
2902         if (srvr_ecdh != NULL) 
2903                 EC_KEY_free(srvr_ecdh);
2904         BN_CTX_free(bn_ctx);
2905 #endif
2906         return(-1);
2907         }
2908
2909 int ssl3_get_cert_verify(SSL *s)
2910         {
2911         EVP_PKEY *pkey=NULL;
2912         unsigned char *p;
2913         int al,ok,ret=0;
2914         long n;
2915         int type=0,i,j;
2916         X509 *peer;
2917         const EVP_MD *md = NULL;
2918         EVP_MD_CTX mctx;
2919         EVP_MD_CTX_init(&mctx);
2920
2921         n=s->method->ssl_get_message(s,
2922                 SSL3_ST_SR_CERT_VRFY_A,
2923                 SSL3_ST_SR_CERT_VRFY_B,
2924                 -1,
2925                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
2926                 &ok);
2927
2928         if (!ok) return((int)n);
2929
2930         if (s->session->peer != NULL)
2931                 {
2932                 peer=s->session->peer;
2933                 pkey=X509_get_pubkey(peer);
2934                 type=X509_certificate_type(peer,pkey);
2935                 }
2936         else
2937                 {
2938                 peer=NULL;
2939                 pkey=NULL;
2940                 }
2941
2942         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2943                 {
2944                 s->s3->tmp.reuse_message=1;
2945                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
2946                         {
2947                         al=SSL_AD_UNEXPECTED_MESSAGE;
2948                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2949                         goto f_err;
2950                         }
2951                 ret=1;
2952                 goto end;
2953                 }
2954
2955         if (peer == NULL)
2956                 {
2957                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2958                 al=SSL_AD_UNEXPECTED_MESSAGE;
2959                 goto f_err;
2960                 }
2961
2962         if (!(type & EVP_PKT_SIGN))
2963                 {
2964                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2965                 al=SSL_AD_ILLEGAL_PARAMETER;
2966                 goto f_err;
2967                 }
2968
2969         if (s->s3->change_cipher_spec)
2970                 {
2971                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2972                 al=SSL_AD_UNEXPECTED_MESSAGE;
2973                 goto f_err;
2974                 }
2975
2976         /* we now have a signature that we need to verify */
2977         p=(unsigned char *)s->init_msg;
2978         /* Check for broken implementations of GOST ciphersuites */
2979         /* If key is GOST and n is exactly 64, it is bare
2980          * signature without length field */
2981         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2982                 pkey->type == NID_id_GostR3410_2001) )
2983                 {
2984                 i=64;
2985                 } 
2986         else 
2987                 {       
2988                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2989                         {
2990                         int sigalg = tls12_get_sigid(pkey);
2991                         /* Should never happen */
2992                         if (sigalg == -1)
2993                                 {
2994                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2995                                 al=SSL_AD_INTERNAL_ERROR;
2996                                 goto f_err;
2997                                 }
2998                         /* Check key type is consistent with signature */
2999                         if (sigalg != (int)p[1])
3000                                 {
3001                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3002                                 al=SSL_AD_DECODE_ERROR;
3003                                 goto f_err;
3004                                 }
3005                         md = tls12_get_hash(p[0]);
3006                         if (md == NULL)
3007                                 {
3008                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3009                                 al=SSL_AD_DECODE_ERROR;
3010                                 goto f_err;
3011                                 }
3012 #ifdef SSL_DEBUG
3013 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3014 #endif
3015                         p += 2;
3016                         n -= 2;
3017                         }
3018                 n2s(p,i);
3019                 n-=2;
3020                 if (i > n)
3021                         {
3022                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3023                         al=SSL_AD_DECODE_ERROR;
3024                         goto f_err;
3025                         }
3026         }
3027         j=EVP_PKEY_size(pkey);
3028         if ((i > j) || (n > j) || (n <= 0))
3029                 {
3030                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3031                 al=SSL_AD_DECODE_ERROR;
3032                 goto f_err;
3033                 }
3034
3035         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3036                 {
3037                 long hdatalen = 0;
3038                 void *hdata;
3039                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3040                 if (hdatalen <= 0)
3041                         {
3042                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3043                         al=SSL_AD_INTERNAL_ERROR;
3044                         goto f_err;
3045                         }
3046 #ifdef SSL_DEBUG
3047                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3048                                                         EVP_MD_name(md));
3049 #endif
3050                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3051                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3052                         {
3053                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3054                         al=SSL_AD_INTERNAL_ERROR;
3055                         goto f_err;
3056                         }
3057
3058                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3059                         {
3060                         al=SSL_AD_DECRYPT_ERROR;
3061                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3062                         goto f_err;
3063                         }
3064                 }
3065         else
3066 #ifndef OPENSSL_NO_RSA 
3067         if (pkey->type == EVP_PKEY_RSA)
3068                 {
3069                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3070                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
3071                                                         pkey->pkey.rsa);
3072                 if (i < 0)
3073                         {
3074                         al=SSL_AD_DECRYPT_ERROR;
3075                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3076                         goto f_err;
3077                         }
3078                 if (i == 0)
3079                         {
3080                         al=SSL_AD_DECRYPT_ERROR;
3081                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3082                         goto f_err;
3083                         }
3084                 }
3085         else
3086 #endif
3087 #ifndef OPENSSL_NO_DSA
3088                 if (pkey->type == EVP_PKEY_DSA)
3089                 {
3090                 j=DSA_verify(pkey->save_type,
3091                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3092                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3093                 if (j <= 0)
3094                         {
3095                         /* bad signature */
3096                         al=SSL_AD_DECRYPT_ERROR;
3097                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3098                         goto f_err;
3099                         }
3100                 }
3101         else
3102 #endif
3103 #ifndef OPENSSL_NO_ECDSA
3104                 if (pkey->type == EVP_PKEY_EC)
3105                 {
3106                 j=ECDSA_verify(pkey->save_type,
3107                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3108                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3109                 if (j <= 0)
3110                         {
3111                         /* bad signature */
3112                         al=SSL_AD_DECRYPT_ERROR;
3113                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3114                             SSL_R_BAD_ECDSA_SIGNATURE);
3115                         goto f_err;
3116                         }
3117                 }
3118         else
3119 #endif
3120         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3121                 {   unsigned char signature[64];
3122                         int idx;
3123                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3124                         EVP_PKEY_verify_init(pctx);
3125                         if (i!=64) {
3126                                 fprintf(stderr,"GOST signature length is %d",i);
3127                         }       
3128                         for (idx=0;idx<64;idx++) {
3129                                 signature[63-idx]=p[idx];
3130                         }       
3131                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3132                         EVP_PKEY_CTX_free(pctx);
3133                         if (j<=0) 
3134                                 {
3135                                 al=SSL_AD_DECRYPT_ERROR;
3136                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3137                                         SSL_R_BAD_ECDSA_SIGNATURE);
3138                                 goto f_err;
3139                                 }       
3140                 }
3141         else    
3142                 {
3143                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3144                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3145                 goto f_err;
3146                 }
3147
3148
3149         ret=1;
3150         if (0)
3151                 {
3152 f_err:
3153                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3154                 }
3155 end:
3156         if (s->s3->handshake_buffer)
3157                 {
3158                 BIO_free(s->s3->handshake_buffer);
3159                 s->s3->handshake_buffer = NULL;
3160                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3161                 }
3162         EVP_MD_CTX_cleanup(&mctx);
3163         EVP_PKEY_free(pkey);
3164         return(ret);
3165         }
3166
3167 int ssl3_get_client_certificate(SSL *s)
3168         {
3169         int i,ok,al,ret= -1;
3170         X509 *x=NULL;
3171         unsigned long l,nc,llen,n;
3172         const unsigned char *p,*q;
3173         unsigned char *d;
3174         STACK_OF(X509) *sk=NULL;
3175
3176         n=s->method->ssl_get_message(s,
3177                 SSL3_ST_SR_CERT_A,
3178                 SSL3_ST_SR_CERT_B,
3179                 -1,
3180                 s->max_cert_list,
3181                 &ok);
3182
3183         if (!ok) return((int)n);
3184
3185         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3186                 {
3187                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3188                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3189                         {
3190                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3191                         al=SSL_AD_HANDSHAKE_FAILURE;
3192                         goto f_err;
3193                         }
3194                 /* If tls asked for a client cert, the client must return a 0 list */
3195                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3196                         {
3197                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3198                         al=SSL_AD_UNEXPECTED_MESSAGE;
3199                         goto f_err;
3200                         }
3201                 s->s3->tmp.reuse_message=1;
3202                 return(1);
3203                 }
3204
3205         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3206                 {
3207                 al=SSL_AD_UNEXPECTED_MESSAGE;
3208                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3209                 goto f_err;
3210                 }
3211         p=d=(unsigned char *)s->init_msg;
3212
3213         if ((sk=sk_X509_new_null()) == NULL)
3214                 {
3215                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3216                 goto err;
3217                 }
3218
3219         n2l3(p,llen);
3220         if (llen+3 != n)
3221                 {
3222                 al=SSL_AD_DECODE_ERROR;
3223                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3224                 goto f_err;
3225                 }
3226         for (nc=0; nc<llen; )
3227                 {
3228                 n2l3(p,l);
3229                 if ((l+nc+3) > llen)
3230                         {
3231                         al=SSL_AD_DECODE_ERROR;
3232                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3233                         goto f_err;
3234                         }
3235
3236                 q=p;
3237                 x=d2i_X509(NULL,&p,l);
3238                 if (x == NULL)
3239                         {
3240                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3241                         goto err;
3242                         }
3243                 if (p != (q+l))
3244                         {
3245                         al=SSL_AD_DECODE_ERROR;
3246                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3247                         goto f_err;
3248                         }
3249                 if (!sk_X509_push(sk,x))
3250                         {
3251                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3252                         goto err;
3253                         }
3254                 x=NULL;
3255                 nc+=l+3;
3256                 }
3257
3258         if (sk_X509_num(sk) <= 0)
3259                 {
3260                 /* TLS does not mind 0 certs returned */