fdf8052aa127c11618aa424795cbf503baa46aa0
[openssl.git] / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include "ssl_locl.h"
156 #include "kssl_lcl.h"
157 #include <openssl/buffer.h>
158 #include <openssl/rand.h>
159 #include <openssl/objects.h>
160 #include <openssl/evp.h>
161 #include <openssl/hmac.h>
162 #include <openssl/x509.h>
163 #ifndef OPENSSL_NO_DH
164 #include <openssl/dh.h>
165 #endif
166 #include <openssl/bn.h>
167 #ifndef OPENSSL_NO_KRB5
168 #include <openssl/krb5_asn.h>
169 #endif
170 #include <openssl/md5.h>
171
172 static const SSL_METHOD *ssl3_get_server_method(int ver);
173
174 static const SSL_METHOD *ssl3_get_server_method(int ver)
175         {
176         if (ver == SSL3_VERSION)
177                 return(SSLv3_server_method());
178         else
179                 return(NULL);
180         }
181
182 #ifndef OPENSSL_NO_SRP
183 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
184         {
185         int ret = SSL_ERROR_NONE;
186
187         *al = SSL_AD_UNRECOGNIZED_NAME;
188
189         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
190             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
191                 {
192                 if(s->srp_ctx.login == NULL)
193                         {
194                         /* RFC 5054 says SHOULD reject, 
195                            we do so if There is no srp login name */
196                         ret = SSL3_AL_FATAL;
197                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
198                         }
199                 else
200                         {
201                         ret = SSL_srp_server_param_with_username(s,al);
202                         }
203                 }
204         return ret;
205         }
206 #endif
207
208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
209                         ssl3_accept,
210                         ssl_undefined_function,
211                         ssl3_get_server_method)
212
213 int ssl3_accept(SSL *s)
214         {
215         BUF_MEM *buf;
216         unsigned long alg_k,Time=(unsigned long)time(NULL);
217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
218         int ret= -1;
219         int new_state,state,skip=0;
220
221         RAND_add(&Time,sizeof(Time),0);
222         ERR_clear_error();
223         clear_sys_error();
224
225         if (s->info_callback != NULL)
226                 cb=s->info_callback;
227         else if (s->ctx->info_callback != NULL)
228                 cb=s->ctx->info_callback;
229
230         /* init things to blank */
231         s->in_handshake++;
232         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
233
234         if (s->cert == NULL)
235                 {
236                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
237                 return(-1);
238                 }
239
240 #ifndef OPENSSL_NO_HEARTBEATS
241         /* If we're awaiting a HeartbeatResponse, pretend we
242          * already got and don't await it anymore, because
243          * Heartbeats don't make sense during handshakes anyway.
244          */
245         if (s->tlsext_hb_pending)
246                 {
247                 s->tlsext_hb_pending = 0;
248                 s->tlsext_hb_seq++;
249                 }
250 #endif
251
252         for (;;)
253                 {
254                 state=s->state;
255
256                 switch (s->state)
257                         {
258                 case SSL_ST_RENEGOTIATE:
259                         s->renegotiate=1;
260                         /* s->state=SSL_ST_ACCEPT; */
261
262                 case SSL_ST_BEFORE:
263                 case SSL_ST_ACCEPT:
264                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
265                 case SSL_ST_OK|SSL_ST_ACCEPT:
266
267                         s->server=1;
268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
269
270                         if ((s->version>>8) != 3)
271                                 {
272                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
273                                 return -1;
274                                 }
275                         s->type=SSL_ST_ACCEPT;
276
277                         if (s->init_buf == NULL)
278                                 {
279                                 if ((buf=BUF_MEM_new()) == NULL)
280                                         {
281                                         ret= -1;
282                                         goto end;
283                                         }
284                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
285                                         {
286                                         ret= -1;
287                                         goto end;
288                                         }
289                                 s->init_buf=buf;
290                                 }
291
292                         if (!ssl3_setup_buffers(s))
293                                 {
294                                 ret= -1;
295                                 goto end;
296                                 }
297
298                         s->init_num=0;
299                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
300                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
301
302                         if (s->state != SSL_ST_RENEGOTIATE)
303                                 {
304                                 /* Ok, we now need to push on a buffering BIO so that
305                                  * the output is sent in a way that TCP likes :-)
306                                  */
307                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
308                                 
309                                 ssl3_init_finished_mac(s);
310                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
311                                 s->ctx->stats.sess_accept++;
312                                 }
313                         else if (!s->s3->send_connection_binding &&
314                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
315                                 {
316                                 /* Server attempting to renegotiate with
317                                  * client that doesn't support secure
318                                  * renegotiation.
319                                  */
320                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
321                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
322                                 ret = -1;
323                                 goto end;
324                                 }
325                         else
326                                 {
327                                 /* s->state == SSL_ST_RENEGOTIATE,
328                                  * we will just send a HelloRequest */
329                                 s->ctx->stats.sess_accept_renegotiate++;
330                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
331                                 }
332                         break;
333
334                 case SSL3_ST_SW_HELLO_REQ_A:
335                 case SSL3_ST_SW_HELLO_REQ_B:
336
337                         s->shutdown=0;
338                         ret=ssl3_send_hello_request(s);
339                         if (ret <= 0) goto end;
340                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
341                         s->state=SSL3_ST_SW_FLUSH;
342                         s->init_num=0;
343
344                         ssl3_init_finished_mac(s);
345                         break;
346
347                 case SSL3_ST_SW_HELLO_REQ_C:
348                         s->state=SSL_ST_OK;
349                         break;
350
351                 case SSL3_ST_SR_CLNT_HELLO_A:
352                 case SSL3_ST_SR_CLNT_HELLO_B:
353                 case SSL3_ST_SR_CLNT_HELLO_C:
354
355                         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 #ifndef OPENSSL_NO_TLSEXT
406                                 s->state = SSL3_ST_SW_SUPPLEMENTAL_DATA_A;
407 #else
408                         s->state = SSL3_ST_SW_CERT_A;
409 #endif
410                         s->init_num = 0;
411                         break;
412
413 #ifndef OPENSSL_NO_TLSEXT
414                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_A:
415                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_B:
416                         /* We promised to send an audit proof in the hello. */
417                         if (s->s3->tlsext_authz_promised_to_client)
418                                 {
419                                 ret = tls1_send_server_supplemental_data(s);
420                                 if (ret <= 0) goto end;
421                                 }
422                         else
423                                 skip = 1;
424
425                         s->state = SSL3_ST_SW_CERT_A;
426                         s->init_num = 0;
427                         break;
428 #endif
429
430                 case SSL3_ST_SW_CERT_A:
431                 case SSL3_ST_SW_CERT_B:
432                         /* Check if it is anon DH or anon ECDH, */
433                         /* normal PSK or KRB5 or SRP */
434                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
435                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
436                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
437                                 {
438                                 ret=ssl3_send_server_certificate(s);
439                                 if (ret <= 0) goto end;
440 #ifndef OPENSSL_NO_TLSEXT
441                                 if (s->tlsext_status_expected)
442                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
443                                 else
444                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
445                                 }
446                         else
447                                 {
448                                 skip = 1;
449                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
450                                 }
451 #else
452                                 }
453                         else
454                                 skip=1;
455
456                         s->state=SSL3_ST_SW_KEY_EXCH_A;
457 #endif
458                         s->init_num=0;
459                         break;
460
461                 case SSL3_ST_SW_KEY_EXCH_A:
462                 case SSL3_ST_SW_KEY_EXCH_B:
463                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
464
465                         /* clear this, it may get reset by
466                          * send_server_key_exchange */
467                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
468 #ifndef OPENSSL_NO_KRB5
469                                 && !(alg_k & SSL_kKRB5)
470 #endif /* OPENSSL_NO_KRB5 */
471                                 )
472                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
473                                  * even when forbidden by protocol specs
474                                  * (handshake may fail as clients are not required to
475                                  * be able to handle this) */
476                                 s->s3->tmp.use_rsa_tmp=1;
477                         else
478                                 s->s3->tmp.use_rsa_tmp=0;
479
480
481                         /* only send if a DH key exchange, fortezza or
482                          * RSA but we have a sign only certificate
483                          *
484                          * PSK: may send PSK identity hints
485                          *
486                          * For ECC ciphersuites, we send a serverKeyExchange
487                          * message only if the cipher suite is either
488                          * ECDH-anon or ECDHE. In other cases, the
489                          * server certificate contains the server's
490                          * public key for key exchange.
491                          */
492                         if (s->s3->tmp.use_rsa_tmp
493                         /* PSK: send ServerKeyExchange if PSK identity
494                          * hint if provided */
495 #ifndef OPENSSL_NO_PSK
496                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
497 #endif
498 #ifndef OPENSSL_NO_SRP
499                             /* SRP: send ServerKeyExchange */
500                             || (alg_k & SSL_kSRP)
501 #endif
502                             || (alg_k & SSL_kEDH)
503                             || (alg_k & SSL_kEECDH)
504                             || ((alg_k & SSL_kRSA)
505                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
506                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
507                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
508                                         )
509                                     )
510                                 )
511                             )
512                                 {
513                                 ret=ssl3_send_server_key_exchange(s);
514                                 if (ret <= 0) goto end;
515                                 }
516                         else
517                                 skip=1;
518
519                         s->state=SSL3_ST_SW_CERT_REQ_A;
520                         s->init_num=0;
521                         break;
522
523                 case SSL3_ST_SW_CERT_REQ_A:
524                 case SSL3_ST_SW_CERT_REQ_B:
525                         if (/* don't request cert unless asked for it: */
526                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
527                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
528                                  * don't request cert during re-negotiation: */
529                                 ((s->session->peer != NULL) &&
530                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
531                                 /* never request cert in anonymous ciphersuites
532                                  * (see section "Certificate request" in SSL 3 drafts
533                                  * and in RFC 2246): */
534                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
535                                  /* ... except when the application insists on verification
536                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
537                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
538                                  /* never request cert in Kerberos ciphersuites */
539                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
540                                 /* With normal PSK Certificates and
541                                  * Certificate Requests are omitted */
542                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
543                                 {
544                                 /* no cert request */
545                                 skip=1;
546                                 s->s3->tmp.cert_request=0;
547                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
548                                 if (s->s3->handshake_buffer)
549                                         if (!ssl3_digest_cached_records(s))
550                                                 return -1;
551                                 }
552                         else
553                                 {
554                                 s->s3->tmp.cert_request=1;
555                                 ret=ssl3_send_certificate_request(s);
556                                 if (ret <= 0) goto end;
557 #ifndef NETSCAPE_HANG_BUG
558                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
559 #else
560                                 s->state=SSL3_ST_SW_FLUSH;
561                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
562 #endif
563                                 s->init_num=0;
564                                 }
565                         break;
566
567                 case SSL3_ST_SW_SRVR_DONE_A:
568                 case SSL3_ST_SW_SRVR_DONE_B:
569                         ret=ssl3_send_server_done(s);
570                         if (ret <= 0) goto end;
571                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
572                         s->state=SSL3_ST_SW_FLUSH;
573                         s->init_num=0;
574                         break;
575                 
576                 case SSL3_ST_SW_FLUSH:
577
578                         /* This code originally checked to see if
579                          * any data was pending using BIO_CTRL_INFO
580                          * and then flushed. This caused problems
581                          * as documented in PR#1939. The proposed
582                          * fix doesn't completely resolve this issue
583                          * as buggy implementations of BIO_CTRL_PENDING
584                          * still exist. So instead we just flush
585                          * unconditionally.
586                          */
587
588                         s->rwstate=SSL_WRITING;
589                         if (BIO_flush(s->wbio) <= 0)
590                                 {
591                                 ret= -1;
592                                 goto end;
593                                 }
594                         s->rwstate=SSL_NOTHING;
595
596                         s->state=s->s3->tmp.next_state;
597                         break;
598
599                 case SSL3_ST_SR_CERT_A:
600                 case SSL3_ST_SR_CERT_B:
601                         /* Check for second client hello (MS SGC) */
602                         ret = ssl3_check_client_hello(s);
603                         if (ret <= 0)
604                                 goto end;
605                         if (ret == 2)
606                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
607                         else {
608                                 if (s->s3->tmp.cert_request)
609                                         {
610                                         ret=ssl3_get_client_certificate(s);
611                                         if (ret <= 0) goto end;
612                                         }
613                                 s->init_num=0;
614                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
615                         }
616                         break;
617
618                 case SSL3_ST_SR_KEY_EXCH_A:
619                 case SSL3_ST_SR_KEY_EXCH_B:
620                         ret=ssl3_get_client_key_exchange(s);
621                         if (ret <= 0)
622                                 goto end;
623                         if (ret == 2)
624                                 {
625                                 /* For the ECDH ciphersuites when
626                                  * the client sends its ECDH pub key in
627                                  * a certificate, the CertificateVerify
628                                  * message is not sent.
629                                  * Also for GOST ciphersuites when
630                                  * the client uses its key from the certificate
631                                  * for key exchange.
632                                  */
633 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
634                                 s->state=SSL3_ST_SR_FINISHED_A;
635 #else
636                                 if (s->s3->next_proto_neg_seen)
637                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
638                                 else
639                                         s->state=SSL3_ST_SR_FINISHED_A;
640 #endif
641                                 s->init_num = 0;
642                                 }
643                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
644                                 {
645                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
646                                 s->init_num=0;
647                                 if (!s->session->peer)
648                                         break;
649                                 /* For TLS v1.2 freeze the handshake buffer
650                                  * at this point and digest cached records.
651                                  */
652                                 if (!s->s3->handshake_buffer)
653                                         {
654                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
655                                         return -1;
656                                         }
657                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
658                                 if (!ssl3_digest_cached_records(s))
659                                         return -1;
660                                 }
661                         else
662                                 {
663                                 int offset=0;
664                                 int dgst_num;
665
666                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
667                                 s->init_num=0;
668
669                                 /* We need to get hashes here so if there is
670                                  * a client cert, it can be verified
671                                  * FIXME - digest processing for CertificateVerify
672                                  * should be generalized. But it is next step
673                                  */
674                                 if (s->s3->handshake_buffer)
675                                         if (!ssl3_digest_cached_records(s))
676                                                 return -1;
677                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
678                                         if (s->s3->handshake_dgst[dgst_num]) 
679                                                 {
680                                                 int dgst_size;
681
682                                                 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]));
683                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
684                                                 if (dgst_size < 0)
685                                                         {
686                                                         ret = -1;
687                                                         goto end;
688                                                         }
689                                                 offset+=dgst_size;
690                                                 }               
691                                 }
692                         break;
693
694                 case SSL3_ST_SR_CERT_VRFY_A:
695                 case SSL3_ST_SR_CERT_VRFY_B:
696
697                         /* we should decide if we expected this one */
698                         ret=ssl3_get_cert_verify(s);
699                         if (ret <= 0) goto end;
700
701 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
702                         s->state=SSL3_ST_SR_FINISHED_A;
703 #else
704                         if (s->s3->next_proto_neg_seen)
705                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
706                         else
707                                 s->state=SSL3_ST_SR_FINISHED_A;
708 #endif
709                         s->init_num=0;
710                         break;
711
712 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
713                 case SSL3_ST_SR_NEXT_PROTO_A:
714                 case SSL3_ST_SR_NEXT_PROTO_B:
715                         ret=ssl3_get_next_proto(s);
716                         if (ret <= 0) goto end;
717                         s->init_num = 0;
718                         s->state=SSL3_ST_SR_FINISHED_A;
719                         break;
720 #endif
721
722                 case SSL3_ST_SR_FINISHED_A:
723                 case SSL3_ST_SR_FINISHED_B:
724                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
725                                 SSL3_ST_SR_FINISHED_B);
726                         if (ret <= 0) goto end;
727                         if (s->hit)
728                                 s->state=SSL_ST_OK;
729 #ifndef OPENSSL_NO_TLSEXT
730                         else if (s->tlsext_ticket_expected)
731                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
732 #endif
733                         else
734                                 s->state=SSL3_ST_SW_CHANGE_A;
735                         s->init_num=0;
736                         break;
737
738 #ifndef OPENSSL_NO_TLSEXT
739                 case SSL3_ST_SW_SESSION_TICKET_A:
740                 case SSL3_ST_SW_SESSION_TICKET_B:
741                         ret=ssl3_send_newsession_ticket(s);
742                         if (ret <= 0) goto end;
743                         s->state=SSL3_ST_SW_CHANGE_A;
744                         s->init_num=0;
745                         break;
746
747                 case SSL3_ST_SW_CERT_STATUS_A:
748                 case SSL3_ST_SW_CERT_STATUS_B:
749                         ret=ssl3_send_cert_status(s);
750                         if (ret <= 0) goto end;
751                         s->state=SSL3_ST_SW_KEY_EXCH_A;
752                         s->init_num=0;
753                         break;
754
755 #endif
756
757                 case SSL3_ST_SW_CHANGE_A:
758                 case SSL3_ST_SW_CHANGE_B:
759
760                         s->session->cipher=s->s3->tmp.new_cipher;
761                         if (!s->method->ssl3_enc->setup_key_block(s))
762                                 { ret= -1; goto end; }
763
764                         ret=ssl3_send_change_cipher_spec(s,
765                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
766
767                         if (ret <= 0) goto end;
768                         s->state=SSL3_ST_SW_FINISHED_A;
769                         s->init_num=0;
770
771                         if (!s->method->ssl3_enc->change_cipher_state(s,
772                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
773                                 {
774                                 ret= -1;
775                                 goto end;
776                                 }
777
778                         break;
779
780                 case SSL3_ST_SW_FINISHED_A:
781                 case SSL3_ST_SW_FINISHED_B:
782                         ret=ssl3_send_finished(s,
783                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
784                                 s->method->ssl3_enc->server_finished_label,
785                                 s->method->ssl3_enc->server_finished_label_len);
786                         if (ret <= 0) goto end;
787                         s->state=SSL3_ST_SW_FLUSH;
788                         if (s->hit)
789                                 {
790 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
791                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
792 #else
793                                 if (s->s3->next_proto_neg_seen)
794                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
795                                 else
796                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
797 #endif
798                                 }
799                         else
800                                 s->s3->tmp.next_state=SSL_ST_OK;
801                         s->init_num=0;
802                         break;
803
804                 case SSL_ST_OK:
805                         /* clean a few things up */
806                         ssl3_cleanup_key_block(s);
807
808                         BUF_MEM_free(s->init_buf);
809                         s->init_buf=NULL;
810
811                         /* remove buffering on output */
812                         ssl_free_wbio_buffer(s);
813
814                         s->init_num=0;
815
816                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
817                                 {
818                                 s->renegotiate=0;
819                                 s->new_session=0;
820                                 
821                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
822                                 
823                                 s->ctx->stats.sess_accept_good++;
824                                 /* s->server=1; */
825                                 s->handshake_func=ssl3_accept;
826
827                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
828                                 }
829                         
830                         ret = 1;
831                         goto end;
832                         /* break; */
833
834                 default:
835                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
836                         ret= -1;
837                         goto end;
838                         /* break; */
839                         }
840                 
841                 if (!s->s3->tmp.reuse_message && !skip)
842                         {
843                         if (s->debug)
844                                 {
845                                 if ((ret=BIO_flush(s->wbio)) <= 0)
846                                         goto end;
847                                 }
848
849
850                         if ((cb != NULL) && (s->state != state))
851                                 {
852                                 new_state=s->state;
853                                 s->state=state;
854                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
855                                 s->state=new_state;
856                                 }
857                         }
858                 skip=0;
859                 }
860 end:
861         /* BIO_flush(s->wbio); */
862
863         s->in_handshake--;
864         if (cb != NULL)
865                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
866         return(ret);
867         }
868
869 int ssl3_send_hello_request(SSL *s)
870         {
871         unsigned char *p;
872
873         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
874                 {
875                 p=(unsigned char *)s->init_buf->data;
876                 *(p++)=SSL3_MT_HELLO_REQUEST;
877                 *(p++)=0;
878                 *(p++)=0;
879                 *(p++)=0;
880
881                 s->state=SSL3_ST_SW_HELLO_REQ_B;
882                 /* number of bytes to write */
883                 s->init_num=4;
884                 s->init_off=0;
885                 }
886
887         /* SSL3_ST_SW_HELLO_REQ_B */
888         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
889         }
890
891 int ssl3_check_client_hello(SSL *s)
892         {
893         int ok;
894         long n;
895
896         /* this function is called when we really expect a Certificate message,
897          * so permit appropriate message length */
898         n=s->method->ssl_get_message(s,
899                 SSL3_ST_SR_CERT_A,
900                 SSL3_ST_SR_CERT_B,
901                 -1,
902                 s->max_cert_list,
903                 &ok);
904         if (!ok) return((int)n);
905         s->s3->tmp.reuse_message = 1;
906         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
907                 {
908                 /* We only allow the client to restart the handshake once per
909                  * negotiation. */
910                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
911                         {
912                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
913                         return -1;
914                         }
915                 /* Throw away what we have done so far in the current handshake,
916                  * which will now be aborted. (A full SSL_clear would be too much.) */
917 #ifndef OPENSSL_NO_DH
918                 if (s->s3->tmp.dh != NULL)
919                         {
920                         DH_free(s->s3->tmp.dh);
921                         s->s3->tmp.dh = NULL;
922                         }
923 #endif
924 #ifndef OPENSSL_NO_ECDH
925                 if (s->s3->tmp.ecdh != NULL)
926                         {
927                         EC_KEY_free(s->s3->tmp.ecdh);
928                         s->s3->tmp.ecdh = NULL;
929                         }
930 #endif
931                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
932                 return 2;
933                 }
934         return 1;
935 }
936
937 int ssl3_get_client_hello(SSL *s)
938         {
939         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
940         unsigned int cookie_len;
941         long n;
942         unsigned long id;
943         unsigned char *p,*d,*q;
944         SSL_CIPHER *c;
945 #ifndef OPENSSL_NO_COMP
946         SSL_COMP *comp=NULL;
947 #endif
948         STACK_OF(SSL_CIPHER) *ciphers=NULL;
949
950         /* We do this so that we will respond with our native type.
951          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
952          * This down switching should be handled by a different method.
953          * If we are SSLv3, we will respond with SSLv3, even if prompted with
954          * TLSv1.
955          */
956         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
957                 )
958                 {
959                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
960                 }
961         s->first_packet=1;
962         n=s->method->ssl_get_message(s,
963                 SSL3_ST_SR_CLNT_HELLO_B,
964                 SSL3_ST_SR_CLNT_HELLO_C,
965                 SSL3_MT_CLIENT_HELLO,
966                 SSL3_RT_MAX_PLAIN_LENGTH,
967                 &ok);
968
969         if (!ok) return((int)n);
970         s->first_packet=0;
971         d=p=(unsigned char *)s->init_msg;
972
973         /* use version from inside client hello, not from record header
974          * (may differ: see RFC 2246, Appendix E, second paragraph) */
975         s->client_version=(((int)p[0])<<8)|(int)p[1];
976         p+=2;
977
978         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
979             (s->version != DTLS1_VERSION && s->client_version < s->version))
980                 {
981                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
982                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
983                         {
984                         /* similar to ssl3_get_record, send alert using remote version number */
985                         s->version = s->client_version;
986                         }
987                 al = SSL_AD_PROTOCOL_VERSION;
988                 goto f_err;
989                 }
990
991         /* If we require cookies and this ClientHello doesn't
992          * contain one, just return since we do not want to
993          * allocate any memory yet. So check cookie length...
994          */
995         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
996                 {
997                 unsigned int session_length, cookie_length;
998                 
999                 session_length = *(p + SSL3_RANDOM_SIZE);
1000                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
1001
1002                 if (cookie_length == 0)
1003                         return 1;
1004                 }
1005
1006         /* load the client random */
1007         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1008         p+=SSL3_RANDOM_SIZE;
1009
1010         /* get the session-id */
1011         j= *(p++);
1012
1013         s->hit=0;
1014         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1015          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1016          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1017          * than a change to default behavior so that applications relying on this for security
1018          * won't even compile against older library versions).
1019          *
1020          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1021          * renegotiation but not a new session (s->new_session remains unset): for servers,
1022          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1023          * setting will be ignored.
1024          */
1025         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1026                 {
1027                 if (!ssl_get_new_session(s,1))
1028                         goto err;
1029                 }
1030         else
1031                 {
1032                 i=ssl_get_prev_session(s, p, j, d + n);
1033                 if (i == 1)
1034                         { /* previous session */
1035                         s->hit=1;
1036                         }
1037                 else if (i == -1)
1038                         goto err;
1039                 else /* i == 0 */
1040                         {
1041                         if (!ssl_get_new_session(s,1))
1042                                 goto err;
1043                         }
1044                 }
1045
1046         p+=j;
1047
1048         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1049                 {
1050                 /* cookie stuff */
1051                 cookie_len = *(p++);
1052
1053                 /* 
1054                  * The ClientHello may contain a cookie even if the
1055                  * HelloVerify message has not been sent--make sure that it
1056                  * does not cause an overflow.
1057                  */
1058                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1059                         {
1060                         /* too much data */
1061                         al = SSL_AD_DECODE_ERROR;
1062                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1063                         goto f_err;
1064                         }
1065
1066                 /* verify the cookie if appropriate option is set. */
1067                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1068                         cookie_len > 0)
1069                         {
1070                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1071
1072                         if ( s->ctx->app_verify_cookie_cb != NULL)
1073                                 {
1074                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1075                                         cookie_len) == 0)
1076                                         {
1077                                         al=SSL_AD_HANDSHAKE_FAILURE;
1078                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1079                                                 SSL_R_COOKIE_MISMATCH);
1080                                         goto f_err;
1081                                         }
1082                                 /* else cookie verification succeeded */
1083                                 }
1084                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1085                                                   s->d1->cookie_len) != 0) /* default verification */
1086                                 {
1087                                         al=SSL_AD_HANDSHAKE_FAILURE;
1088                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1089                                                 SSL_R_COOKIE_MISMATCH);
1090                                         goto f_err;
1091                                 }
1092
1093                         ret = 2;
1094                         }
1095
1096                 p += cookie_len;
1097                 }
1098
1099         n2s(p,i);
1100         if ((i == 0) && (j != 0))
1101                 {
1102                 /* we need a cipher if we are not resuming a session */
1103                 al=SSL_AD_ILLEGAL_PARAMETER;
1104                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1105                 goto f_err;
1106                 }
1107         if ((p+i) >= (d+n))
1108                 {
1109                 /* not enough data */
1110                 al=SSL_AD_DECODE_ERROR;
1111                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1112                 goto f_err;
1113                 }
1114         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1115                 == NULL))
1116                 {
1117                 goto err;
1118                 }
1119         p+=i;
1120
1121         /* If it is a hit, check that the cipher is in the list */
1122         if ((s->hit) && (i > 0))
1123                 {
1124                 j=0;
1125                 id=s->session->cipher->id;
1126
1127 #ifdef CIPHER_DEBUG
1128                 printf("client sent %d ciphers\n",sk_num(ciphers));
1129 #endif
1130                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1131                         {
1132                         c=sk_SSL_CIPHER_value(ciphers,i);
1133 #ifdef CIPHER_DEBUG
1134                         printf("client [%2d of %2d]:%s\n",
1135                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1136 #endif
1137                         if (c->id == id)
1138                                 {
1139                                 j=1;
1140                                 break;
1141                                 }
1142                         }
1143 /* Disabled because it can be used in a ciphersuite downgrade
1144  * attack: CVE-2010-4180.
1145  */
1146 #if 0
1147                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1148                         {
1149                         /* Special case as client bug workaround: the previously used cipher may
1150                          * not be in the current list, the client instead might be trying to
1151                          * continue using a cipher that before wasn't chosen due to server
1152                          * preferences.  We'll have to reject the connection if the cipher is not
1153                          * enabled, though. */
1154                         c = sk_SSL_CIPHER_value(ciphers, 0);
1155                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1156                                 {
1157                                 s->session->cipher = c;
1158                                 j = 1;
1159                                 }
1160                         }
1161 #endif
1162                 if (j == 0)
1163                         {
1164                         /* we need to have the cipher in the cipher
1165                          * list if we are asked to reuse it */
1166                         al=SSL_AD_ILLEGAL_PARAMETER;
1167                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1168                         goto f_err;
1169                         }
1170                 }
1171
1172         /* compression */
1173         i= *(p++);
1174         if ((p+i) > (d+n))
1175                 {
1176                 /* not enough data */
1177                 al=SSL_AD_DECODE_ERROR;
1178                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1179                 goto f_err;
1180                 }
1181         q=p;
1182         for (j=0; j<i; j++)
1183                 {
1184                 if (p[j] == 0) break;
1185                 }
1186
1187         p+=i;
1188         if (j >= i)
1189                 {
1190                 /* no compress */
1191                 al=SSL_AD_DECODE_ERROR;
1192                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1193                 goto f_err;
1194                 }
1195
1196 #ifndef OPENSSL_NO_TLSEXT
1197         /* TLS extensions*/
1198         if (s->version >= SSL3_VERSION)
1199                 {
1200                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1201                         {
1202                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1203                         goto err;
1204                         }
1205                 }
1206
1207         /* Check if we want to use external pre-shared secret for this
1208          * handshake for not reused session only. We need to generate
1209          * server_random before calling tls_session_secret_cb in order to allow
1210          * SessionTicket processing to use it in key derivation. */
1211         {
1212                 unsigned long Time;
1213                 unsigned char *pos;
1214                 Time=(unsigned long)time(NULL);                 /* Time */
1215                 pos=s->s3->server_random;
1216                 l2n(Time,pos);
1217                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1218                         {
1219                         goto f_err;
1220                         }
1221         }
1222
1223         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1224                 {
1225                 SSL_CIPHER *pref_cipher=NULL;
1226
1227                 s->session->master_key_length=sizeof(s->session->master_key);
1228                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1229                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1230                         {
1231                         s->hit=1;
1232                         s->session->ciphers=ciphers;
1233                         s->session->verify_result=X509_V_OK;
1234
1235                         ciphers=NULL;
1236
1237                         /* check if some cipher was preferred by call back */
1238                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1239                         if (pref_cipher == NULL)
1240                                 {
1241                                 al=SSL_AD_HANDSHAKE_FAILURE;
1242                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1243                                 goto f_err;
1244                                 }
1245
1246                         s->session->cipher=pref_cipher;
1247
1248                         if (s->cipher_list)
1249                                 sk_SSL_CIPHER_free(s->cipher_list);
1250
1251                         if (s->cipher_list_by_id)
1252                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1253
1254                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1255                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1256                         }
1257                 }
1258 #endif
1259
1260         /* Worst case, we will use the NULL compression, but if we have other
1261          * options, we will now look for them.  We have i-1 compression
1262          * algorithms from the client, starting at q. */
1263         s->s3->tmp.new_compression=NULL;
1264 #ifndef OPENSSL_NO_COMP
1265         /* This only happens if we have a cache hit */
1266         if (s->session->compress_meth != 0)
1267                 {
1268                 int m, comp_id = s->session->compress_meth;
1269                 /* Perform sanity checks on resumed compression algorithm */
1270                 /* Can't disable compression */
1271                 if (s->options & SSL_OP_NO_COMPRESSION)
1272                         {
1273                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1274                         goto f_err;
1275                         }
1276                 /* Look for resumed compression method */
1277                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1278                         {
1279                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1280                         if (comp_id == comp->id)
1281                                 {
1282                                 s->s3->tmp.new_compression=comp;
1283                                 break;
1284                                 }
1285                         }
1286                 if (s->s3->tmp.new_compression == NULL)
1287                         {
1288                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1289                         goto f_err;
1290                         }
1291                 /* Look for resumed method in compression list */
1292                 for (m = 0; m < i; m++)
1293                         {
1294                         if (q[m] == comp_id)
1295                                 break;
1296                         }
1297                 if (m >= i)
1298                         {
1299                         al=SSL_AD_ILLEGAL_PARAMETER;
1300                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1301                         goto f_err;
1302                         }
1303                 }
1304         else if (s->hit)
1305                 comp = NULL;
1306         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1307                 { /* See if we have a match */
1308                 int m,nn,o,v,done=0;
1309
1310                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1311                 for (m=0; m<nn; m++)
1312                         {
1313                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1314                         v=comp->id;
1315                         for (o=0; o<i; o++)
1316                                 {
1317                                 if (v == q[o])
1318                                         {
1319                                         done=1;
1320                                         break;
1321                                         }
1322                                 }
1323                         if (done) break;
1324                         }
1325                 if (done)
1326                         s->s3->tmp.new_compression=comp;
1327                 else
1328                         comp=NULL;
1329                 }
1330 #else
1331         /* If compression is disabled we'd better not try to resume a session
1332          * using compression.
1333          */
1334         if (s->session->compress_meth != 0)
1335                 {
1336                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1337                 goto f_err;
1338                 }
1339 #endif
1340
1341         /* Given s->session->ciphers and SSL_get_ciphers, we must
1342          * pick a cipher */
1343
1344         if (!s->hit)
1345                 {
1346 #ifdef OPENSSL_NO_COMP
1347                 s->session->compress_meth=0;
1348 #else
1349                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1350 #endif
1351                 if (s->session->ciphers != NULL)
1352                         sk_SSL_CIPHER_free(s->session->ciphers);
1353                 s->session->ciphers=ciphers;
1354                 if (ciphers == NULL)
1355                         {
1356                         al=SSL_AD_ILLEGAL_PARAMETER;
1357                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1358                         goto f_err;
1359                         }
1360                 ciphers=NULL;
1361                 c=ssl3_choose_cipher(s,s->session->ciphers,
1362                                      SSL_get_ciphers(s));
1363
1364                 if (c == NULL)
1365                         {
1366                         al=SSL_AD_HANDSHAKE_FAILURE;
1367                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1368                         goto f_err;
1369                         }
1370                 s->s3->tmp.new_cipher=c;
1371                 /* check whether we should disable session resumption */
1372                 if (s->not_resumable_session_cb != NULL)
1373                         s->session->not_resumable=s->not_resumable_session_cb(s,
1374                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1375                 if (s->session->not_resumable)
1376                         /* do not send a session ticket */
1377                         s->tlsext_ticket_expected = 0;
1378                 }
1379         else
1380                 {
1381                 /* Session-id reuse */
1382 #ifdef REUSE_CIPHER_BUG
1383                 STACK_OF(SSL_CIPHER) *sk;
1384                 SSL_CIPHER *nc=NULL;
1385                 SSL_CIPHER *ec=NULL;
1386
1387                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1388                         {
1389                         sk=s->session->ciphers;
1390                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1391                                 {
1392                                 c=sk_SSL_CIPHER_value(sk,i);
1393                                 if (c->algorithm_enc & SSL_eNULL)
1394                                         nc=c;
1395                                 if (SSL_C_IS_EXPORT(c))
1396                                         ec=c;
1397                                 }
1398                         if (nc != NULL)
1399                                 s->s3->tmp.new_cipher=nc;
1400                         else if (ec != NULL)
1401                                 s->s3->tmp.new_cipher=ec;
1402                         else
1403                                 s->s3->tmp.new_cipher=s->session->cipher;
1404                         }
1405                 else
1406 #endif
1407                 s->s3->tmp.new_cipher=s->session->cipher;
1408                 }
1409
1410         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1411                 {
1412                 if (!ssl3_digest_cached_records(s))
1413                         goto f_err;
1414                 }
1415         
1416         /* we now have the following setup. 
1417          * client_random
1418          * cipher_list          - our prefered list of ciphers
1419          * ciphers              - the clients prefered list of ciphers
1420          * compression          - basically ignored right now
1421          * ssl version is set   - sslv3
1422          * s->session           - The ssl session has been setup.
1423          * s->hit               - session reuse flag
1424          * s->tmp.new_cipher    - the new cipher to use.
1425          */
1426
1427         if (ret < 0) ret=1;
1428         if (0)
1429                 {
1430 f_err:
1431                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1432                 }
1433 err:
1434         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1435         return(ret);
1436         }
1437
1438 int ssl3_send_server_hello(SSL *s)
1439         {
1440         unsigned char *buf;
1441         unsigned char *p,*d;
1442         int i,sl;
1443         unsigned long l;
1444 #ifdef OPENSSL_NO_TLSEXT
1445         unsigned long Time;
1446 #endif
1447
1448         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1449                 {
1450                 buf=(unsigned char *)s->init_buf->data;
1451 #ifdef OPENSSL_NO_TLSEXT
1452                 p=s->s3->server_random;
1453                 /* Generate server_random if it was not needed previously */
1454                 Time=(unsigned long)time(NULL);                 /* Time */
1455                 l2n(Time,p);
1456                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1457                         return -1;
1458 #endif
1459                 /* Do the message type and length last */
1460                 d=p= &(buf[4]);
1461
1462                 *(p++)=s->version>>8;
1463                 *(p++)=s->version&0xff;
1464
1465                 /* Random stuff */
1466                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1467                 p+=SSL3_RANDOM_SIZE;
1468
1469                 /* There are several cases for the session ID to send
1470                  * back in the server hello:
1471                  * - For session reuse from the session cache,
1472                  *   we send back the old session ID.
1473                  * - If stateless session reuse (using a session ticket)
1474                  *   is successful, we send back the client's "session ID"
1475                  *   (which doesn't actually identify the session).
1476                  * - If it is a new session, we send back the new
1477                  *   session ID.
1478                  * - However, if we want the new session to be single-use,
1479                  *   we send back a 0-length session ID.
1480                  * s->hit is non-zero in either case of session reuse,
1481                  * so the following won't overwrite an ID that we're supposed
1482                  * to send back.
1483                  */
1484                 if (s->session->not_resumable ||
1485                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1486                                 && !s->hit))
1487                         s->session->session_id_length=0;
1488
1489                 sl=s->session->session_id_length;
1490                 if (sl > (int)sizeof(s->session->session_id))
1491                         {
1492                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1493                         return -1;
1494                         }
1495                 *(p++)=sl;
1496                 memcpy(p,s->session->session_id,sl);
1497                 p+=sl;
1498
1499                 /* put the cipher */
1500                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1501                 p+=i;
1502
1503                 /* put the compression method */
1504 #ifdef OPENSSL_NO_COMP
1505                         *(p++)=0;
1506 #else
1507                 if (s->s3->tmp.new_compression == NULL)
1508                         *(p++)=0;
1509                 else
1510                         *(p++)=s->s3->tmp.new_compression->id;
1511 #endif
1512 #ifndef OPENSSL_NO_TLSEXT
1513                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1514                         {
1515                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1516                         return -1;
1517                         }
1518                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1519                         {
1520                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1521                         return -1;
1522                         }
1523 #endif
1524                 /* do the header */
1525                 l=(p-d);
1526                 d=buf;
1527                 *(d++)=SSL3_MT_SERVER_HELLO;
1528                 l2n3(l,d);
1529
1530                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1531                 /* number of bytes to write */
1532                 s->init_num=p-buf;
1533                 s->init_off=0;
1534                 }
1535
1536         /* SSL3_ST_SW_SRVR_HELLO_B */
1537         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1538         }
1539
1540 int ssl3_send_server_done(SSL *s)
1541         {
1542         unsigned char *p;
1543
1544         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1545                 {
1546                 p=(unsigned char *)s->init_buf->data;
1547
1548                 /* do the header */
1549                 *(p++)=SSL3_MT_SERVER_DONE;
1550                 *(p++)=0;
1551                 *(p++)=0;
1552                 *(p++)=0;
1553
1554                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1555                 /* number of bytes to write */
1556                 s->init_num=4;
1557                 s->init_off=0;
1558                 }
1559
1560         /* SSL3_ST_SW_SRVR_DONE_B */
1561         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1562         }
1563
1564 int ssl3_send_server_key_exchange(SSL *s)
1565         {
1566 #ifndef OPENSSL_NO_RSA
1567         unsigned char *q;
1568         int j,num;
1569         RSA *rsa;
1570         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1571         unsigned int u;
1572 #endif
1573 #ifndef OPENSSL_NO_DH
1574         DH *dh=NULL,*dhp;
1575 #endif
1576 #ifndef OPENSSL_NO_ECDH
1577         EC_KEY *ecdh=NULL, *ecdhp;
1578         unsigned char *encodedPoint = NULL;
1579         int encodedlen = 0;
1580         int curve_id = 0;
1581         BN_CTX *bn_ctx = NULL; 
1582 #endif
1583         EVP_PKEY *pkey;
1584         const EVP_MD *md = NULL;
1585         unsigned char *p,*d;
1586         int al,i;
1587         unsigned long type;
1588         int n;
1589         CERT *cert;
1590         BIGNUM *r[4];
1591         int nr[4],kn;
1592         BUF_MEM *buf;
1593         EVP_MD_CTX md_ctx;
1594
1595         EVP_MD_CTX_init(&md_ctx);
1596         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1597                 {
1598                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1599                 cert=s->cert;
1600
1601                 buf=s->init_buf;
1602
1603                 r[0]=r[1]=r[2]=r[3]=NULL;
1604                 n=0;
1605 #ifndef OPENSSL_NO_RSA
1606                 if (type & SSL_kRSA)
1607                         {
1608                         rsa=cert->rsa_tmp;
1609                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1610                                 {
1611                                 rsa=s->cert->rsa_tmp_cb(s,
1612                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1613                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1614                                 if(rsa == NULL)
1615                                 {
1616                                         al=SSL_AD_HANDSHAKE_FAILURE;
1617                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1618                                         goto f_err;
1619                                 }
1620                                 RSA_up_ref(rsa);
1621                                 cert->rsa_tmp=rsa;
1622                                 }
1623                         if (rsa == NULL)
1624                                 {
1625                                 al=SSL_AD_HANDSHAKE_FAILURE;
1626                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1627                                 goto f_err;
1628                                 }
1629                         r[0]=rsa->n;
1630                         r[1]=rsa->e;
1631                         s->s3->tmp.use_rsa_tmp=1;
1632                         }
1633                 else
1634 #endif
1635 #ifndef OPENSSL_NO_DH
1636                         if (type & SSL_kEDH)
1637                         {
1638                         dhp=cert->dh_tmp;
1639                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1640                                 dhp=s->cert->dh_tmp_cb(s,
1641                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1642                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1643                         if (dhp == NULL)
1644                                 {
1645                                 al=SSL_AD_HANDSHAKE_FAILURE;
1646                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1647                                 goto f_err;
1648                                 }
1649
1650                         if (s->s3->tmp.dh != NULL)
1651                                 {
1652                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1653                                 goto err;
1654                                 }
1655
1656                         if ((dh=DHparams_dup(dhp)) == NULL)
1657                                 {
1658                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1659                                 goto err;
1660                                 }
1661
1662                         s->s3->tmp.dh=dh;
1663                         if ((dhp->pub_key == NULL ||
1664                              dhp->priv_key == NULL ||
1665                              (s->options & SSL_OP_SINGLE_DH_USE)))
1666                                 {
1667                                 if(!DH_generate_key(dh))
1668                                     {
1669                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1670                                            ERR_R_DH_LIB);
1671                                     goto err;
1672                                     }
1673                                 }
1674                         else
1675                                 {
1676                                 dh->pub_key=BN_dup(dhp->pub_key);
1677                                 dh->priv_key=BN_dup(dhp->priv_key);
1678                                 if ((dh->pub_key == NULL) ||
1679                                         (dh->priv_key == NULL))
1680                                         {
1681                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1682                                         goto err;
1683                                         }
1684                                 }
1685                         r[0]=dh->p;
1686                         r[1]=dh->g;
1687                         r[2]=dh->pub_key;
1688                         }
1689                 else 
1690 #endif
1691 #ifndef OPENSSL_NO_ECDH
1692                         if (type & SSL_kEECDH)
1693                         {
1694                         const EC_GROUP *group;
1695
1696                         ecdhp=cert->ecdh_tmp;
1697                         if (s->cert->ecdh_tmp_auto)
1698                                 {
1699                                 /* Get NID of first shared curve */
1700                                 int nid = tls1_shared_curve(s, 0);
1701                                 if (nid != NID_undef)
1702                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1703                                 }
1704                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1705                                 {
1706                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1707                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1708                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1709                                 }
1710                         if (ecdhp == NULL)
1711                                 {
1712                                 al=SSL_AD_HANDSHAKE_FAILURE;
1713                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1714                                 goto f_err;
1715                                 }
1716
1717                         if (s->s3->tmp.ecdh != NULL)
1718                                 {
1719                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1720                                 goto err;
1721                                 }
1722
1723                         /* Duplicate the ECDH structure. */
1724                         if (ecdhp == NULL)
1725                                 {
1726                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1727                                 goto err;
1728                                 }
1729                         if (s->cert->ecdh_tmp_auto)
1730                                 ecdh = ecdhp;
1731                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1732                                 {
1733                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1734                                 goto err;
1735                                 }
1736
1737                         s->s3->tmp.ecdh=ecdh;
1738                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1739                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1740                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1741                                 {
1742                                 if(!EC_KEY_generate_key(ecdh))
1743                                     {
1744                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1745                                     goto err;
1746                                     }
1747                                 }
1748
1749                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1750                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1751                             (EC_KEY_get0_private_key(ecdh) == NULL))
1752                                 {
1753                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1754                                 goto err;
1755                                 }
1756
1757                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1758                             (EC_GROUP_get_degree(group) > 163)) 
1759                                 {
1760                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1761                                 goto err;
1762                                 }
1763
1764                         /* XXX: For now, we only support ephemeral ECDH
1765                          * keys over named (not generic) curves. For 
1766                          * supported named curves, curve_id is non-zero.
1767                          */
1768                         if ((curve_id = 
1769                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1770                             == 0)
1771                                 {
1772                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1773                                 goto err;
1774                                 }
1775
1776                         /* Encode the public key.
1777                          * First check the size of encoding and
1778                          * allocate memory accordingly.
1779                          */
1780                         encodedlen = EC_POINT_point2oct(group, 
1781                             EC_KEY_get0_public_key(ecdh),
1782                             POINT_CONVERSION_UNCOMPRESSED, 
1783                             NULL, 0, NULL);
1784
1785                         encodedPoint = (unsigned char *) 
1786                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1787                         bn_ctx = BN_CTX_new();
1788                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1789                                 {
1790                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1791                                 goto err;
1792                                 }
1793
1794
1795                         encodedlen = EC_POINT_point2oct(group, 
1796                             EC_KEY_get0_public_key(ecdh), 
1797                             POINT_CONVERSION_UNCOMPRESSED, 
1798                             encodedPoint, encodedlen, bn_ctx);
1799
1800                         if (encodedlen == 0) 
1801                                 {
1802                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1803                                 goto err;
1804                                 }
1805
1806                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1807
1808                         /* XXX: For now, we only support named (not 
1809                          * generic) curves in ECDH ephemeral key exchanges.
1810                          * In this situation, we need four additional bytes
1811                          * to encode the entire ServerECDHParams
1812                          * structure. 
1813                          */
1814                         n = 4 + encodedlen;
1815
1816                         /* We'll generate the serverKeyExchange message
1817                          * explicitly so we can set these to NULLs
1818                          */
1819                         r[0]=NULL;
1820                         r[1]=NULL;
1821                         r[2]=NULL;
1822                         r[3]=NULL;
1823                         }
1824                 else 
1825 #endif /* !OPENSSL_NO_ECDH */
1826 #ifndef OPENSSL_NO_PSK
1827                         if (type & SSL_kPSK)
1828                                 {
1829                                 /* reserve size for record length and PSK identity hint*/
1830                                 n+=2+strlen(s->ctx->psk_identity_hint);
1831                                 }
1832                         else
1833 #endif /* !OPENSSL_NO_PSK */
1834 #ifndef OPENSSL_NO_SRP
1835                 if (type & SSL_kSRP)
1836                         {
1837                         if ((s->srp_ctx.N == NULL) ||
1838                                 (s->srp_ctx.g == NULL) ||
1839                                 (s->srp_ctx.s == NULL) ||
1840                                 (s->srp_ctx.B == NULL))
1841                                 {
1842                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1843                                 goto err;
1844                                 }
1845                         r[0]=s->srp_ctx.N;
1846                         r[1]=s->srp_ctx.g;
1847                         r[2]=s->srp_ctx.s;
1848                         r[3]=s->srp_ctx.B;
1849                         }
1850                 else 
1851 #endif
1852                         {
1853                         al=SSL_AD_HANDSHAKE_FAILURE;
1854                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1855                         goto f_err;
1856                         }
1857                 for (i=0; r[i] != NULL && i<4; i++)
1858                         {
1859                         nr[i]=BN_num_bytes(r[i]);
1860 #ifndef OPENSSL_NO_SRP
1861                         if ((i == 2) && (type & SSL_kSRP))
1862                                 n+=1+nr[i];
1863                         else
1864 #endif
1865                         n+=2+nr[i];
1866                         }
1867
1868                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1869                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1870                         {
1871                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1872                                 == NULL)
1873                                 {
1874                                 al=SSL_AD_DECODE_ERROR;
1875                                 goto f_err;
1876                                 }
1877                         kn=EVP_PKEY_size(pkey);
1878                         }
1879                 else
1880                         {
1881                         pkey=NULL;
1882                         kn=0;
1883                         }
1884
1885                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1886                         {
1887                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1888                         goto err;
1889                         }
1890                 d=(unsigned char *)s->init_buf->data;
1891                 p= &(d[4]);
1892
1893                 for (i=0; r[i] != NULL && i<4; i++)
1894                         {
1895 #ifndef OPENSSL_NO_SRP
1896                         if ((i == 2) && (type & SSL_kSRP))
1897                                 {
1898                                 *p = nr[i];
1899                                 p++;
1900                                 }
1901                         else
1902 #endif
1903                         s2n(nr[i],p);
1904                         BN_bn2bin(r[i],p);
1905                         p+=nr[i];
1906                         }
1907
1908 #ifndef OPENSSL_NO_ECDH
1909                 if (type & SSL_kEECDH) 
1910                         {
1911                         /* XXX: For now, we only support named (not generic) curves.
1912                          * In this situation, the serverKeyExchange message has:
1913                          * [1 byte CurveType], [2 byte CurveName]
1914                          * [1 byte length of encoded point], followed by
1915                          * the actual encoded point itself
1916                          */
1917                         *p = NAMED_CURVE_TYPE;
1918                         p += 1;
1919                         *p = 0;
1920                         p += 1;
1921                         *p = curve_id;
1922                         p += 1;
1923                         *p = encodedlen;
1924                         p += 1;
1925                         memcpy((unsigned char*)p, 
1926                             (unsigned char *)encodedPoint, 
1927                             encodedlen);
1928                         OPENSSL_free(encodedPoint);
1929                         encodedPoint = NULL;
1930                         p += encodedlen;
1931                         }
1932 #endif
1933
1934 #ifndef OPENSSL_NO_PSK
1935                 if (type & SSL_kPSK)
1936                         {
1937                         /* copy PSK identity hint */
1938                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1939                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1940                         p+=strlen(s->ctx->psk_identity_hint);
1941                         }
1942 #endif
1943
1944                 /* not anonymous */
1945                 if (pkey != NULL)
1946                         {
1947                         /* n is the length of the params, they start at &(d[4])
1948                          * and p points to the space at the end. */
1949 #ifndef OPENSSL_NO_RSA
1950                         if (pkey->type == EVP_PKEY_RSA
1951                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1952                                 {
1953                                 q=md_buf;
1954                                 j=0;
1955                                 for (num=2; num > 0; num--)
1956                                         {
1957                                         EVP_MD_CTX_set_flags(&md_ctx,
1958                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1959                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1960                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1961                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1962                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1963                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1964                                         EVP_DigestFinal_ex(&md_ctx,q,
1965                                                 (unsigned int *)&i);
1966                                         q+=i;
1967                                         j+=i;
1968                                         }
1969                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1970                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1971                                         {
1972                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1973                                         goto err;
1974                                         }
1975                                 s2n(u,p);
1976                                 n+=u+2;
1977                                 }
1978                         else
1979 #endif
1980                         if (md)
1981                                 {
1982                                 /* For TLS1.2 and later send signature
1983                                  * algorithm */
1984                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1985                                         {
1986                                         if (!tls12_get_sigandhash(p, pkey, md))
1987                                                 {
1988                                                 /* Should never happen */
1989                                                 al=SSL_AD_INTERNAL_ERROR;
1990                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1991                                                 goto f_err;
1992                                                 }
1993                                         p+=2;
1994                                         }
1995 #ifdef SSL_DEBUG
1996                                 fprintf(stderr, "Using hash %s\n",
1997                                                         EVP_MD_name(md));
1998 #endif
1999                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2000                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2001                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2002                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
2003                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2004                                         (unsigned int *)&i,pkey))
2005                                         {
2006                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2007                                         goto err;
2008                                         }
2009                                 s2n(i,p);
2010                                 n+=i+2;
2011                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2012                                         n+= 2;
2013                                 }
2014                         else
2015                                 {
2016                                 /* Is this error check actually needed? */
2017                                 al=SSL_AD_HANDSHAKE_FAILURE;
2018                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2019                                 goto f_err;
2020                                 }
2021                         }
2022
2023                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2024                 l2n3(n,d);
2025
2026                 /* we should now have things packed up, so lets send
2027                  * it off */
2028                 s->init_num=n+4;
2029                 s->init_off=0;
2030                 }
2031
2032         s->state = SSL3_ST_SW_KEY_EXCH_B;
2033         EVP_MD_CTX_cleanup(&md_ctx);
2034         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2035 f_err:
2036         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2037 err:
2038 #ifndef OPENSSL_NO_ECDH
2039         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2040         BN_CTX_free(bn_ctx);
2041 #endif
2042         EVP_MD_CTX_cleanup(&md_ctx);
2043         return(-1);
2044         }
2045
2046 int ssl3_send_certificate_request(SSL *s)
2047         {
2048         unsigned char *p,*d;
2049         int i,j,nl,off,n;
2050         STACK_OF(X509_NAME) *sk=NULL;
2051         X509_NAME *name;
2052         BUF_MEM *buf;
2053
2054         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2055                 {
2056                 buf=s->init_buf;
2057
2058                 d=p=(unsigned char *)&(buf->data[4]);
2059
2060                 /* get the list of acceptable cert types */
2061                 p++;
2062                 n=ssl3_get_req_cert_type(s,p);
2063                 d[0]=n;
2064                 p+=n;
2065                 n++;
2066
2067                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2068                         {
2069                         nl = tls12_get_req_sig_algs(s, p + 2);
2070                         s2n(nl, p);
2071                         p += nl + 2;
2072                         n += nl + 2;
2073                         }
2074
2075                 off=n;
2076                 p+=2;
2077                 n+=2;
2078
2079                 sk=SSL_get_client_CA_list(s);
2080                 nl=0;
2081                 if (sk != NULL)
2082                         {
2083                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2084                                 {
2085                                 name=sk_X509_NAME_value(sk,i);
2086                                 j=i2d_X509_NAME(name,NULL);
2087                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2088                                         {
2089                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2090                                         goto err;
2091                                         }
2092                                 p=(unsigned char *)&(buf->data[4+n]);
2093                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2094                                         {
2095                                         s2n(j,p);
2096                                         i2d_X509_NAME(name,&p);
2097                                         n+=2+j;
2098                                         nl+=2+j;
2099                                         }
2100                                 else
2101                                         {
2102                                         d=p;
2103                                         i2d_X509_NAME(name,&p);
2104                                         j-=2; s2n(j,d); j+=2;
2105                                         n+=j;
2106                                         nl+=j;
2107                                         }
2108                                 }
2109                         }
2110                 /* else no CA names */
2111                 p=(unsigned char *)&(buf->data[4+off]);
2112                 s2n(nl,p);
2113
2114                 d=(unsigned char *)buf->data;
2115                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2116                 l2n3(n,d);
2117
2118                 /* we should now have things packed up, so lets send
2119                  * it off */
2120
2121                 s->init_num=n+4;
2122                 s->init_off=0;
2123 #ifdef NETSCAPE_HANG_BUG
2124                 p=(unsigned char *)s->init_buf->data + s->init_num;
2125
2126                 /* do the header */
2127                 *(p++)=SSL3_MT_SERVER_DONE;
2128                 *(p++)=0;
2129                 *(p++)=0;
2130                 *(p++)=0;
2131                 s->init_num += 4;
2132 #endif
2133
2134                 s->state = SSL3_ST_SW_CERT_REQ_B;
2135                 }
2136
2137         /* SSL3_ST_SW_CERT_REQ_B */
2138         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2139 err:
2140         return(-1);
2141         }
2142
2143 int ssl3_get_client_key_exchange(SSL *s)
2144         {
2145         int i,al,ok;
2146         long n;
2147         unsigned long alg_k;
2148         unsigned char *p;
2149 #ifndef OPENSSL_NO_RSA
2150         RSA *rsa=NULL;
2151         EVP_PKEY *pkey=NULL;
2152 #endif
2153 #ifndef OPENSSL_NO_DH
2154         BIGNUM *pub=NULL;
2155         DH *dh_srvr, *dh_clnt = NULL;
2156 #endif
2157 #ifndef OPENSSL_NO_KRB5
2158         KSSL_ERR kssl_err;
2159 #endif /* OPENSSL_NO_KRB5 */
2160
2161 #ifndef OPENSSL_NO_ECDH
2162         EC_KEY *srvr_ecdh = NULL;
2163         EVP_PKEY *clnt_pub_pkey = NULL;
2164         EC_POINT *clnt_ecpoint = NULL;
2165         BN_CTX *bn_ctx = NULL; 
2166 #endif
2167
2168         n=s->method->ssl_get_message(s,
2169                 SSL3_ST_SR_KEY_EXCH_A,
2170                 SSL3_ST_SR_KEY_EXCH_B,
2171                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2172                 2048, /* ??? */
2173                 &ok);
2174
2175         if (!ok) return((int)n);
2176         p=(unsigned char *)s->init_msg;
2177
2178         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2179
2180 #ifndef OPENSSL_NO_RSA
2181         if (alg_k & SSL_kRSA)
2182                 {
2183                 /* FIX THIS UP EAY EAY EAY EAY */
2184                 if (s->s3->tmp.use_rsa_tmp)
2185                         {
2186                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2187                                 rsa=s->cert->rsa_tmp;
2188                         /* Don't do a callback because rsa_tmp should
2189                          * be sent already */
2190                         if (rsa == NULL)
2191                                 {
2192                                 al=SSL_AD_HANDSHAKE_FAILURE;
2193                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2194                                 goto f_err;
2195
2196                                 }
2197                         }
2198                 else
2199                         {
2200                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2201                         if (    (pkey == NULL) ||
2202                                 (pkey->type != EVP_PKEY_RSA) ||
2203                                 (pkey->pkey.rsa == NULL))
2204                                 {
2205                                 al=SSL_AD_HANDSHAKE_FAILURE;
2206                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2207                                 goto f_err;
2208                                 }
2209                         rsa=pkey->pkey.rsa;
2210                         }
2211
2212                 /* TLS and [incidentally] DTLS{0xFEFF} */
2213                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2214                         {
2215                         n2s(p,i);
2216                         if (n != i+2)
2217                                 {
2218                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2219                                         {
2220                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2221                                         goto err;
2222                                         }
2223                                 else
2224                                         p-=2;
2225                                 }
2226                         else
2227                                 n=i;
2228                         }
2229
2230                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2231
2232                 al = -1;
2233                 
2234                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2235                         {
2236                         al=SSL_AD_DECODE_ERROR;
2237                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2238                         }
2239
2240                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2241                         {
2242                         /* The premaster secret must contain the same version number as the
2243                          * ClientHello to detect version rollback attacks (strangely, the
2244                          * protocol does not offer such protection for DH ciphersuites).
2245                          * However, buggy clients exist that send the negotiated protocol
2246                          * version instead if the server does not support the requested
2247                          * protocol version.
2248                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2249                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2250                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2251                                 {
2252                                 al=SSL_AD_DECODE_ERROR;
2253                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2254
2255                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2256                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2257                                  * number check as a "bad version oracle" -- an alert would
2258                                  * reveal that the plaintext corresponding to some ciphertext
2259                                  * made up by the adversary is properly formatted except
2260                                  * that the version number is wrong.  To avoid such attacks,
2261                                  * we should treat this just like any other decryption error. */
2262                                 }
2263                         }
2264
2265                 if (al != -1)
2266                         {
2267                         /* Some decryption failure -- use random value instead as countermeasure
2268                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2269                          * (see RFC 2246, section 7.4.7.1). */
2270                         ERR_clear_error();
2271                         i = SSL_MAX_MASTER_KEY_LENGTH;
2272                         p[0] = s->client_version >> 8;
2273                         p[1] = s->client_version & 0xff;
2274                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2275                                 goto err;
2276                         }
2277         
2278                 s->session->master_key_length=
2279                         s->method->ssl3_enc->generate_master_secret(s,
2280                                 s->session->master_key,
2281                                 p,i);
2282                 OPENSSL_cleanse(p,i);
2283                 }
2284         else
2285 #endif
2286 #ifndef OPENSSL_NO_DH
2287                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2288                 {
2289                 int idx = -1;
2290                 EVP_PKEY *skey = NULL;
2291                 if (n)
2292                         n2s(p,i);
2293                 else
2294                         i = 0;
2295                 if (n && n != i+2)
2296                         {
2297                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2298                                 {
2299                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2300                                 goto err;
2301                                 }
2302                         else
2303                                 {
2304                                 p-=2;
2305                                 i=(int)n;
2306                                 }
2307                         }
2308                 if (alg_k & SSL_kDHr)
2309                         idx = SSL_PKEY_DH_RSA;
2310                 else if (alg_k & SSL_kDHd)
2311                         idx = SSL_PKEY_DH_DSA;
2312                 if (idx >= 0)
2313                         {
2314                         skey = s->cert->pkeys[idx].privatekey;
2315                         if ((skey == NULL) ||
2316                                 (skey->type != EVP_PKEY_DH) ||
2317                                 (skey->pkey.dh == NULL))
2318                                 {
2319                                 al=SSL_AD_HANDSHAKE_FAILURE;
2320                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2321                                 goto f_err;
2322                                 }
2323                         dh_srvr = skey->pkey.dh;
2324                         }
2325                 else if (s->s3->tmp.dh == NULL)
2326                         {
2327                         al=SSL_AD_HANDSHAKE_FAILURE;
2328                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2329                         goto f_err;
2330                         }
2331                 else
2332                         dh_srvr=s->s3->tmp.dh;
2333
2334                 if (n == 0L)
2335                         {
2336                         /* Get pubkey from cert */
2337                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2338                         if (clkey)
2339                                 {
2340                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2341                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2342                                 }
2343                         if (dh_clnt == NULL)
2344                                 {
2345                                 al=SSL_AD_HANDSHAKE_FAILURE;
2346                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2347                                 goto f_err;
2348                                 }
2349                         EVP_PKEY_free(clkey);
2350                         pub = dh_clnt->pub_key;
2351                         }
2352                 else
2353                         pub=BN_bin2bn(p,i,NULL);
2354                 if (pub == NULL)
2355                         {
2356                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2357                         goto err;
2358                         }
2359
2360                 i=DH_compute_key(p,pub,dh_srvr);
2361
2362                 if (i <= 0)
2363                         {
2364                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2365                         BN_clear_free(pub);
2366                         goto err;
2367                         }
2368
2369                 DH_free(s->s3->tmp.dh);
2370                 s->s3->tmp.dh=NULL;
2371                 if (dh_clnt)
2372                         DH_free(dh_clnt);
2373                 else
2374                         BN_clear_free(pub);
2375                 pub=NULL;
2376                 s->session->master_key_length=
2377                         s->method->ssl3_enc->generate_master_secret(s,
2378                                 s->session->master_key,p,i);
2379                 OPENSSL_cleanse(p,i);
2380                 if (dh_clnt)
2381                         return 2;
2382                 }
2383         else
2384 #endif
2385 #ifndef OPENSSL_NO_KRB5
2386         if (alg_k & SSL_kKRB5)
2387                 {
2388                 krb5_error_code         krb5rc;
2389                 krb5_data               enc_ticket;
2390                 krb5_data               authenticator;
2391                 krb5_data               enc_pms;
2392                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2393                 EVP_CIPHER_CTX          ciph_ctx;
2394                 const EVP_CIPHER        *enc = NULL;
2395                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2396                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2397                                                + EVP_MAX_BLOCK_LENGTH];
2398                 int                  padl, outl;
2399                 krb5_timestamp          authtime = 0;
2400                 krb5_ticket_times       ttimes;
2401
2402                 EVP_CIPHER_CTX_init(&ciph_ctx);
2403
2404                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2405
2406                 n2s(p,i);
2407                 enc_ticket.length = i;
2408
2409                 if (n < (long)(enc_ticket.length + 6))
2410                         {
2411                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2412                                 SSL_R_DATA_LENGTH_TOO_LONG);
2413                         goto err;
2414                         }
2415
2416                 enc_ticket.data = (char *)p;
2417                 p+=enc_ticket.length;
2418
2419                 n2s(p,i);
2420                 authenticator.length = i;
2421
2422                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2423                         {
2424                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2425                                 SSL_R_DATA_LENGTH_TOO_LONG);
2426                         goto err;
2427                         }
2428
2429                 authenticator.data = (char *)p;
2430                 p+=authenticator.length;
2431
2432                 n2s(p,i);
2433                 enc_pms.length = i;
2434                 enc_pms.data = (char *)p;
2435                 p+=enc_pms.length;
2436
2437                 /* Note that the length is checked again below,
2438                 ** after decryption
2439                 */
2440                 if(enc_pms.length > sizeof pms)
2441                         {
2442                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2443                                SSL_R_DATA_LENGTH_TOO_LONG);
2444                         goto err;
2445                         }
2446
2447                 if (n != (long)(enc_ticket.length + authenticator.length +
2448                                                 enc_pms.length + 6))
2449                         {
2450                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2451                                 SSL_R_DATA_LENGTH_TOO_LONG);
2452                         goto err;
2453                         }
2454
2455                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2456                                         &kssl_err)) != 0)
2457                         {
2458 #ifdef KSSL_DEBUG
2459                         printf("kssl_sget_tkt rtn %d [%d]\n",
2460                                 krb5rc, kssl_err.reason);
2461                         if (kssl_err.text)
2462                                 printf("kssl_err text= %s\n", kssl_err.text);
2463 #endif  /* KSSL_DEBUG */
2464                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2465                                 kssl_err.reason);
2466                         goto err;
2467                         }
2468
2469                 /*  Note: no authenticator is not considered an error,
2470                 **  but will return authtime == 0.
2471                 */
2472                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2473                                         &authtime, &kssl_err)) != 0)
2474                         {
2475 #ifdef KSSL_DEBUG
2476                         printf("kssl_check_authent rtn %d [%d]\n",
2477                                 krb5rc, kssl_err.reason);
2478                         if (kssl_err.text)
2479                                 printf("kssl_err text= %s\n", kssl_err.text);
2480 #endif  /* KSSL_DEBUG */
2481                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2482                                 kssl_err.reason);
2483                         goto err;
2484                         }
2485
2486                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2487                         {
2488                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2489                         goto err;
2490                         }
2491
2492 #ifdef KSSL_DEBUG
2493                 kssl_ctx_show(kssl_ctx);
2494 #endif  /* KSSL_DEBUG */
2495
2496                 enc = kssl_map_enc(kssl_ctx->enctype);
2497                 if (enc == NULL)
2498                     goto err;
2499
2500                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2501
2502                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2503                         {
2504                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2505                                 SSL_R_DECRYPTION_FAILED);
2506                         goto err;
2507                         }
2508                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2509                                         (unsigned char *)enc_pms.data, enc_pms.length))
2510                         {
2511                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2512                                 SSL_R_DECRYPTION_FAILED);
2513                         goto err;
2514                         }
2515                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2516                         {
2517                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2518                                 SSL_R_DATA_LENGTH_TOO_LONG);
2519                         goto err;
2520                         }
2521                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2522                         {
2523                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2524                                 SSL_R_DECRYPTION_FAILED);
2525                         goto err;
2526                         }
2527                 outl += padl;
2528                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2529                         {
2530                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2531                                 SSL_R_DATA_LENGTH_TOO_LONG);
2532                         goto err;
2533                         }
2534                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2535                     {
2536                     /* The premaster secret must contain the same version number as the
2537                      * ClientHello to detect version rollback attacks (strangely, the
2538                      * protocol does not offer such protection for DH ciphersuites).
2539                      * However, buggy clients exist that send random bytes instead of
2540                      * the protocol version.
2541                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2542                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2543                      */
2544                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2545                         {
2546                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2547                                SSL_AD_DECODE_ERROR);
2548                         goto err;
2549                         }
2550                     }
2551
2552                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2553
2554                 s->session->master_key_length=
2555                         s->method->ssl3_enc->generate_master_secret(s,
2556                                 s->session->master_key, pms, outl);
2557
2558                 if (kssl_ctx->client_princ)
2559                         {
2560                         size_t len = strlen(kssl_ctx->client_princ);
2561                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2562                                 {
2563                                 s->session->krb5_client_princ_len = len;
2564                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2565                                 }
2566                         }
2567
2568
2569                 /*  Was doing kssl_ctx_free() here,
2570                 **  but it caused problems for apache.
2571                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2572                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2573                 */
2574                 }
2575         else
2576 #endif  /* OPENSSL_NO_KRB5 */
2577
2578 #ifndef OPENSSL_NO_ECDH
2579                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2580                 {
2581                 int ret = 1;
2582                 int field_size = 0;
2583                 const EC_KEY   *tkey;
2584                 const EC_GROUP *group;
2585                 const BIGNUM *priv_key;
2586
2587                 /* initialize structures for server's ECDH key pair */
2588                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2589                         {
2590                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2591                             ERR_R_MALLOC_FAILURE);
2592                         goto err;
2593                         }
2594
2595                 /* Let's get server private key and group information */
2596                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2597                         { 
2598                         /* use the certificate */
2599                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2600                         }
2601                 else
2602                         {
2603                         /* use the ephermeral values we saved when
2604                          * generating the ServerKeyExchange msg.
2605                          */
2606                         tkey = s->s3->tmp.ecdh;
2607                         }
2608
2609                 group    = EC_KEY_get0_group(tkey);
2610                 priv_key = EC_KEY_get0_private_key(tkey);
2611
2612                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2613                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2614                         {
2615                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2616                                ERR_R_EC_LIB);
2617                         goto err;
2618                         }
2619
2620                 /* Let's get client's public key */
2621                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2622                         {
2623                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2624                             ERR_R_MALLOC_FAILURE);
2625                         goto err;
2626                         }
2627
2628                 if (n == 0L) 
2629                         {
2630                         /* Client Publickey was in Client Certificate */
2631
2632                          if (alg_k & SSL_kEECDH)
2633                                  {
2634                                  al=SSL_AD_HANDSHAKE_FAILURE;
2635                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2636                                  goto f_err;
2637                                  }
2638                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2639                             == NULL) || 
2640                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2641                                 {
2642                                 /* XXX: For now, we do not support client
2643                                  * authentication using ECDH certificates
2644                                  * so this branch (n == 0L) of the code is
2645                                  * never executed. When that support is
2646                                  * added, we ought to ensure the key 
2647                                  * received in the certificate is 
2648                                  * authorized for key agreement.
2649                                  * ECDH_compute_key implicitly checks that
2650                                  * the two ECDH shares are for the same
2651                                  * group.
2652                                  */
2653                                 al=SSL_AD_HANDSHAKE_FAILURE;
2654                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2655                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2656                                 goto f_err;
2657                                 }
2658
2659                         if (EC_POINT_copy(clnt_ecpoint,
2660                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2661                                 {
2662                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2663                                         ERR_R_EC_LIB);
2664                                 goto err;
2665                                 }
2666                         ret = 2; /* Skip certificate verify processing */
2667                         }
2668                 else
2669                         {
2670                         /* Get client's public key from encoded point
2671                          * in the ClientKeyExchange message.
2672                          */
2673                         if ((bn_ctx = BN_CTX_new()) == NULL)
2674                                 {
2675                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2676                                     ERR_R_MALLOC_FAILURE);
2677                                 goto err;
2678                                 }
2679
2680                         /* Get encoded point length */
2681                         i = *p; 
2682                         p += 1;
2683                         if (n != 1 + i)
2684                                 {
2685                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2686                                     ERR_R_EC_LIB);
2687                                 goto err;
2688                                 }
2689                         if (EC_POINT_oct2point(group, 
2690                             clnt_ecpoint, p, i, bn_ctx) == 0)
2691                                 {
2692                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2693                                     ERR_R_EC_LIB);
2694                                 goto err;
2695                                 }
2696                         /* p is pointing to somewhere in the buffer
2697                          * currently, so set it to the start 
2698                          */ 
2699                         p=(unsigned char *)s->init_buf->data;
2700                         }
2701
2702                 /* Compute the shared pre-master secret */
2703                 field_size = EC_GROUP_get_degree(group);
2704                 if (field_size <= 0)
2705                         {
2706                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2707                                ERR_R_ECDH_LIB);
2708                         goto err;
2709                         }
2710                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2711                 if (i <= 0)
2712                         {
2713                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2714                             ERR_R_ECDH_LIB);
2715                         goto err;
2716                         }
2717
2718                 EVP_PKEY_free(clnt_pub_pkey);
2719                 EC_POINT_free(clnt_ecpoint);
2720                 EC_KEY_free(srvr_ecdh);
2721                 BN_CTX_free(bn_ctx);
2722                 EC_KEY_free(s->s3->tmp.ecdh);
2723                 s->s3->tmp.ecdh = NULL; 
2724
2725                 /* Compute the master secret */
2726                 s->session->master_key_length = s->method->ssl3_enc-> \
2727                     generate_master_secret(s, s->session->master_key, p, i);
2728                 
2729                 OPENSSL_cleanse(p, i);
2730                 return (ret);
2731                 }
2732         else
2733 #endif
2734 #ifndef OPENSSL_NO_PSK
2735                 if (alg_k & SSL_kPSK)
2736                         {
2737                         unsigned char *t = NULL;
2738                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2739                         unsigned int pre_ms_len = 0, psk_len = 0;
2740                         int psk_err = 1;
2741                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2742
2743                         al=SSL_AD_HANDSHAKE_FAILURE;
2744
2745                         n2s(p,i);
2746                         if (n != i+2)
2747                                 {
2748                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2749                                         SSL_R_LENGTH_MISMATCH);
2750                                 goto psk_err;
2751                                 }
2752                         if (i > PSK_MAX_IDENTITY_LEN)
2753                                 {
2754                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2755                                         SSL_R_DATA_LENGTH_TOO_LONG);
2756                                 goto psk_err;
2757                                 }
2758                         if (s->psk_server_callback == NULL)
2759                                 {
2760                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2761                                        SSL_R_PSK_NO_SERVER_CB);
2762                                 goto psk_err;
2763                                 }
2764
2765                         /* Create guaranteed NULL-terminated identity
2766                          * string for the callback */
2767                         memcpy(tmp_id, p, i);
2768                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2769                         psk_len = s->psk_server_callback(s, tmp_id,
2770                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2771                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2772
2773                         if (psk_len > PSK_MAX_PSK_LEN)
2774                                 {
2775                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2776                                         ERR_R_INTERNAL_ERROR);
2777                                 goto psk_err;
2778                                 }
2779                         else if (psk_len == 0)
2780                                 {
2781                                 /* PSK related to the given identity not found */
2782                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2783                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2784                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2785                                 goto psk_err;
2786                                 }
2787
2788                         /* create PSK pre_master_secret */
2789                         pre_ms_len=2+psk_len+2+psk_len;
2790                         t = psk_or_pre_ms;
2791                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2792                         s2n(psk_len, t);
2793                         memset(t, 0, psk_len);
2794                         t+=psk_len;
2795                         s2n(psk_len, t);
2796
2797                         if (s->session->psk_identity != NULL)
2798                                 OPENSSL_free(s->session->psk_identity);
2799                         s->session->psk_identity = BUF_strdup((char *)p);
2800                         if (s->session->psk_identity == NULL)
2801                                 {
2802                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2803                                         ERR_R_MALLOC_FAILURE);
2804                                 goto psk_err;
2805                                 }
2806
2807                         if (s->session->psk_identity_hint != NULL)
2808                                 OPENSSL_free(s->session->psk_identity_hint);
2809                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2810                         if (s->ctx->psk_identity_hint != NULL &&
2811                                 s->session->psk_identity_hint == NULL)
2812                                 {
2813                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2814                                         ERR_R_MALLOC_FAILURE);
2815                                 goto psk_err;
2816                                 }
2817
2818                         s->session->master_key_length=
2819                                 s->method->ssl3_enc->generate_master_secret(s,
2820                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2821                         psk_err = 0;
2822                 psk_err:
2823                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2824                         if (psk_err != 0)
2825                                 goto f_err;
2826                         }
2827                 else
2828 #endif
2829 #ifndef OPENSSL_NO_SRP
2830                 if (alg_k & SSL_kSRP)
2831                         {
2832                         int param_len;
2833
2834                         n2s(p,i);
2835                         param_len=i+2;
2836                         if (param_len > n)
2837                                 {
2838                                 al=SSL_AD_DECODE_ERROR;
2839                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2840                                 goto f_err;
2841                                 }
2842                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2843                                 {
2844                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2845                                 goto err;
2846                                 }
2847                         if (s->session->srp_username != NULL)
2848                                 OPENSSL_free(s->session->srp_username);
2849                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2850                         if (s->session->srp_username == NULL)
2851                                 {
2852                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2853                                         ERR_R_MALLOC_FAILURE);
2854                                 goto err;
2855                                 }
2856
2857                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2858                                 {
2859                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2860                                 goto err;
2861                                 }
2862
2863                         p+=i;
2864                         }
2865                 else
2866 #endif  /* OPENSSL_NO_SRP */
2867                 if (alg_k & SSL_kGOST) 
2868                         {
2869                         int ret = 0;
2870                         EVP_PKEY_CTX *pkey_ctx;
2871                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2872                         unsigned char premaster_secret[32], *start;
2873                         size_t outlen=32, inlen;
2874                         unsigned long alg_a;
2875
2876                         /* Get our certificate private key*/
2877                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2878                         if (alg_a & SSL_aGOST94)
2879                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2880                         else if (alg_a & SSL_aGOST01)
2881                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2882
2883                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2884                         EVP_PKEY_decrypt_init(pkey_ctx);
2885                         /* If client certificate is present and is of the same type, maybe
2886                          * use it for key exchange.  Don't mind errors from
2887                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2888                          * a client certificate for authorization only. */
2889                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2890                         if (client_pub_pkey)
2891                                 {
2892                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2893                                         ERR_clear_error();
2894                                 }
2895                         /* Decrypt session key */
2896                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2897                                 {
2898                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2899                                 goto gerr;
2900                                 }
2901                         if (p[1] == 0x81)
2902                                 {
2903                                 start = p+3;
2904                                 inlen = p[2];
2905                                 }
2906                         else if (p[1] < 0x80)
2907                                 {
2908                                 start = p+2;
2909                                 inlen = p[1];
2910                                 }
2911                         else
2912                                 {
2913                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2914                                 goto gerr;
2915                                 }
2916                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2917
2918                                 {
2919                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2920                                 goto gerr;
2921                                 }
2922                         /* Generate master secret */
2923                         s->session->master_key_length=
2924                                 s->method->ssl3_enc->generate_master_secret(s,
2925                                         s->session->master_key,premaster_secret,32);
2926                         /* Check if pubkey from client certificate was used */
2927                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2928                                 ret = 2;
2929                         else
2930                                 ret = 1;
2931                 gerr:
2932                         EVP_PKEY_free(client_pub_pkey);
2933                         EVP_PKEY_CTX_free(pkey_ctx);
2934                         if (ret)
2935                                 return ret;
2936                         else
2937                                 goto err;
2938                         }
2939                 else
2940                 {
2941                 al=SSL_AD_HANDSHAKE_FAILURE;
2942                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2943                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2944                 goto f_err;
2945                 }
2946
2947         return(1);
2948 f_err:
2949         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2950 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2951 err:
2952 #endif
2953 #ifndef OPENSSL_NO_ECDH
2954         EVP_PKEY_free(clnt_pub_pkey);
2955         EC_POINT_free(clnt_ecpoint);
2956         if (srvr_ecdh != NULL) 
2957                 EC_KEY_free(srvr_ecdh);
2958         BN_CTX_free(bn_ctx);
2959 #endif
2960         return(-1);
2961         }
2962
2963 int ssl3_get_cert_verify(SSL *s)
2964         {
2965         EVP_PKEY *pkey=NULL;
2966         unsigned char *p;
2967         int al,ok,ret=0;
2968         long n;
2969         int type=0,i,j;
2970         X509 *peer;
2971         const EVP_MD *md = NULL;
2972         EVP_MD_CTX mctx;
2973         EVP_MD_CTX_init(&mctx);
2974
2975         n=s->method->ssl_get_message(s,
2976                 SSL3_ST_SR_CERT_VRFY_A,
2977                 SSL3_ST_SR_CERT_VRFY_B,
2978                 -1,
2979                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
2980                 &ok);
2981
2982         if (!ok) return((int)n);
2983
2984         if (s->session->peer != NULL)
2985                 {
2986                 peer=s->session->peer;
2987                 pkey=X509_get_pubkey(peer);
2988                 type=X509_certificate_type(peer,pkey);
2989                 }
2990         else
2991                 {
2992                 peer=NULL;
2993                 pkey=NULL;
2994                 }
2995
2996         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2997                 {
2998                 s->s3->tmp.reuse_message=1;
2999                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3000                         {
3001                         al=SSL_AD_UNEXPECTED_MESSAGE;
3002                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3003                         goto f_err;
3004                         }
3005                 ret=1;
3006                 goto end;
3007                 }
3008
3009         if (peer == NULL)
3010                 {
3011                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3012                 al=SSL_AD_UNEXPECTED_MESSAGE;
3013                 goto f_err;
3014                 }
3015
3016         if (!(type & EVP_PKT_SIGN))
3017                 {
3018                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3019                 al=SSL_AD_ILLEGAL_PARAMETER;
3020                 goto f_err;
3021                 }
3022
3023         if (s->s3->change_cipher_spec)
3024                 {
3025                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3026                 al=SSL_AD_UNEXPECTED_MESSAGE;
3027                 goto f_err;
3028                 }
3029
3030         /* we now have a signature that we need to verify */
3031         p=(unsigned char *)s->init_msg;
3032         /* Check for broken implementations of GOST ciphersuites */
3033         /* If key is GOST and n is exactly 64, it is bare
3034          * signature without length field */
3035         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3036                 pkey->type == NID_id_GostR3410_2001) )
3037                 {
3038                 i=64;
3039                 } 
3040         else 
3041                 {       
3042                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3043                         {
3044                         int sigalg = tls12_get_sigid(pkey);
3045                         /* Should never happen */
3046                         if (sigalg == -1)
3047                                 {
3048                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3049                                 al=SSL_AD_INTERNAL_ERROR;
3050                                 goto f_err;
3051                                 }
3052                         /* Check key type is consistent with signature */
3053                         if (sigalg != (int)p[1])
3054                                 {
3055                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3056                                 al=SSL_AD_DECODE_ERROR;
3057                                 goto f_err;
3058                                 }
3059                         md = tls12_get_hash(p[0]);
3060                         if (md == NULL)
3061                                 {
3062                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3063                                 al=SSL_AD_DECODE_ERROR;
3064                                 goto f_err;
3065                                 }
3066 #ifdef SSL_DEBUG
3067 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3068 #endif
3069                         p += 2;
3070                         n -= 2;
3071                         }
3072                 n2s(p,i);
3073                 n-=2;
3074                 if (i > n)
3075                         {
3076                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3077                         al=SSL_AD_DECODE_ERROR;
3078                         goto f_err;
3079                         }
3080         }
3081         j=EVP_PKEY_size(pkey);
3082         if ((i > j) || (n > j) || (n <= 0))
3083                 {
3084                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3085                 al=SSL_AD_DECODE_ERROR;
3086                 goto f_err;
3087                 }
3088
3089         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3090                 {
3091                 long hdatalen = 0;
3092                 void *hdata;
3093                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3094                 if (hdatalen <= 0)
3095                         {
3096                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3097                         al=SSL_AD_INTERNAL_ERROR;
3098                         goto f_err;
3099                         }
3100 #ifdef SSL_DEBUG
3101                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3102                                                         EVP_MD_name(md));
3103 #endif
3104                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3105                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3106                         {
3107                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3108                         al=SSL_AD_INTERNAL_ERROR;
3109                         goto f_err;
3110                         }
3111
3112                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3113                         {
3114                         al=SSL_AD_DECRYPT_ERROR;
3115                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3116                         goto f_err;
3117                         }
3118                 }
3119         else
3120 #ifndef OPENSSL_NO_RSA 
3121         if (pkey->type == EVP_PKEY_RSA)
3122                 {
3123                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3124                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
3125                                                         pkey->pkey.rsa);
3126                 if (i < 0)
3127                         {
3128                         al=SSL_AD_DECRYPT_ERROR;
3129                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3130                         goto f_err;
3131                         }
3132                 if (i == 0)
3133                         {
3134                         al=SSL_AD_DECRYPT_ERROR;
3135                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3136                         goto f_err;
3137                         }
3138                 }
3139         else
3140 #endif
3141 #ifndef OPENSSL_NO_DSA
3142                 if (pkey->type == EVP_PKEY_DSA)
3143                 {
3144                 j=DSA_verify(pkey->save_type,
3145                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3146                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3147                 if (j <= 0)
3148                         {
3149                         /* bad signature */
3150                         al=SSL_AD_DECRYPT_ERROR;
3151                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3152                         goto f_err;
3153                         }
3154                 }
3155         else
3156 #endif
3157 #ifndef OPENSSL_NO_ECDSA
3158                 if (pkey->type == EVP_PKEY_EC)
3159                 {
3160                 j=ECDSA_verify(pkey->save_type,
3161                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3162                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3163                 if (j <= 0)
3164                         {
3165                         /* bad signature */
3166                         al=SSL_AD_DECRYPT_ERROR;
3167                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3168                             SSL_R_BAD_ECDSA_SIGNATURE);
3169                         goto f_err;
3170                         }
3171                 }
3172         else
3173 #endif
3174         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3175                 {   unsigned char signature[64];
3176                         int idx;
3177                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3178                         EVP_PKEY_verify_init(pctx);
3179                         if (i!=64) {
3180                                 fprintf(stderr,"GOST signature length is %d",i);
3181                         }       
3182                         for (idx=0;idx<64;idx++) {
3183                                 signature[63-idx]=p[idx];
3184                         }       
3185                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3186                         EVP_PKEY_CTX_free(pctx);
3187                         if (j<=0) 
3188                                 {
3189                                 al=SSL_AD_DECRYPT_ERROR;
3190                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3191                                         SSL_R_BAD_ECDSA_SIGNATURE);
3192                                 goto f_err;
3193                                 }       
3194                 }
3195         else    
3196                 {
3197                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3198                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3199                 goto f_err;
3200                 }
3201
3202
3203         ret=1;
3204         if (0)
3205                 {
3206 f_err:
3207                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3208                 }
3209 end:
3210         if (s->s3->handshake_buffer)
3211                 {
3212                 BIO_free(s->s3->handshake_buffer);
3213                 s->s3->handshake_buffer = NULL;
3214                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3215                 }
3216         EVP_MD_CTX_cleanup(&mctx);
3217         EVP_PKEY_free(pkey);
3218         return(ret);
3219         }
3220
3221 int ssl3_get_client_certificate(SSL *s)
3222         {
3223         int i,ok,al,ret= -1;
3224         X509 *x=NULL;
3225         unsigned long l,nc,llen,n;
3226         const unsigned char *p,*q;
3227         unsigned char *d;
3228         STACK_OF(X509) *sk=NULL;
3229
3230         n=s->method->ssl_get_message(s,
3231                 SSL3_ST_SR_CERT_A,
3232                 SSL3_ST_SR_CERT_B,
3233                 -1,
3234                 s->max_cert_list,
3235                 &ok);
3236
3237         if (!ok) return((int)n);
3238
3239         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3240                 {
3241                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3242                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3243                         {
3244                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3245                         al=SSL_AD_HANDSHAKE_FAILURE;
3246                         goto f_err;
3247                         }
3248                 /* If tls asked for a client cert, the client must return a 0 list */
3249                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3250                         {
3251                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3252                         al=SSL_AD_UNEXPECTED_MESSAGE;
3253                         goto f_err;
3254                         }
3255                 s->s3->tmp.reuse_message=1;
3256                 return(1);
3257                 }
3258
3259         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3260                 {
3261                 al=SSL_AD_UNEXPECTED_MESSAGE;
3262                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3263                 goto f_err;
3264                 }
3265         p=d=(unsigned char *)s->init_msg;
3266
3267         if ((sk=sk_X509_new_null()) == NULL)
3268                 {
3269                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3270                 goto err;
3271                 }
3272
3273         n2l3(p,llen);
3274         if (llen+3 != n)
3275                 {
3276                 al=SSL_AD_DECODE_ERROR;
3277                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3278                 goto f_err;
3279                 }
3280         for (nc=0; nc<llen; )
3281                 {
3282                 n2l3(p,l);
3283                 if ((l+nc+3) > llen)
3284                         {
3285                         al=SSL_AD_DECODE_ERROR;
3286                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3287                         goto f_err;
3288                         }
3289
3290                 q=p;
3291                 x=d2i_X509(NULL,&p,l);
3292                 if (x == NULL)
3293                         {
3294                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3295                         goto err;
3296                         }
3297                 if (p != (q+l))
3298                         {
3299                         al=SSL_AD_DECODE_ERROR;
3300                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3301                         goto f_err;
3302                         }
3303                 if (!sk_X509_push(sk,x))
3304                         {
3305                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3306                         goto err;
3307                         }
3308                 x=NULL;
3309                 nc+=l+3;
3310                 }
3311
3312         if (sk_X509_num(sk) <= 0)
3313                 {
3314                 /* TLS does not mind 0 certs returned */
3315                 if (s->version == SSL3_VERSION)
3316                         {
3317                         al=SSL_AD_HANDSHAKE_FAILURE;
3318                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3319                         goto f_err;
3320                         }
3321                 /* Fail for TLS only if we required a certificate */
3322                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3323                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3324                         {
3325                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3326                         al=SSL_AD_HANDSHAKE_FAILURE;
3327                         goto f_err;
3328                         }
3329                 /* No client certificate so digest cached records */
3330                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3331                         {
3332                         al=SSL_AD_INTERNAL_ERROR;
3333                         goto f_err;
3334                         }
3335                 }
3336         else
3337                 {
3338                 i=ssl_verify_cert_chain(s,sk);
3339                 if (i <= 0)
3340                         {
3341                         al=ssl_verify_alarm_type(s->verify_result);
3342                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3343                         goto f_err;
3344                         }
3345                 }
3346
3347         if (s->session->peer != NULL) /* This should not be needed */
3348                 X509_free(s->session->peer);
3349         s->session->peer=sk_X509_shift(sk);
3350         s->session->verify_result = s->verify_result;
3351
3352         /* With the current implementation, sess_cert will always be NULL
3353          * when we arrive here. */
3354         if (s->session->sess_cert == NULL)
3355                 {
3356                 s->session->sess_cert = ssl_sess_cert_new();
3357                 if (s->session->sess_cert == NULL)
3358                         {
3359                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3360                         goto err;
3361                         }
3362                 }
3363         if (s->session->sess_cert->cert_chain != NULL)
3364                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3365         s->session->sess_cert->cert_chain=sk;
3366         /* Inconsistency alert: cert_chain does *not* include the
3367          * peer's own certificate, while we do include it in s3_clnt.c */
3368
3369         sk=NULL;
3370
3371         ret=1;
3372         if (0)
3373                 {
3374 f_err:
3375                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3376                 }
3377 err:
3378         if (