Submitted by: Peter Sylvester <peter.sylvester@edelweb.fr>
[openssl.git] / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include <openssl/crypto.h>
156 #include "ssl_locl.h"
157 #include "kssl_lcl.h"
158 #include <openssl/buffer.h>
159 #include <openssl/rand.h>
160 #include <openssl/objects.h>
161 #include <openssl/evp.h>
162 #include <openssl/hmac.h>
163 #include <openssl/x509.h>
164 #ifndef OPENSSL_NO_DH
165 #include <openssl/dh.h>
166 #endif
167 #include <openssl/bn.h>
168 #ifndef OPENSSL_NO_KRB5
169 #include <openssl/krb5_asn.h>
170 #endif
171 #include <openssl/md5.h>
172
173 static const SSL_METHOD *ssl3_get_server_method(int ver);
174
175 static const SSL_METHOD *ssl3_get_server_method(int ver)
176         {
177         if (ver == SSL3_VERSION)
178                 return(SSLv3_server_method());
179         else
180                 return(NULL);
181         }
182
183 #ifndef OPENSSL_NO_SRP
184 static int ssl_check_srp_ext_ClientHello(SSL *s,int *al)
185         {
186         int ret = SSL_ERROR_NONE;
187
188         *al = SSL_AD_UNRECOGNIZED_NAME;
189
190         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
191             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
192                 {
193                 if(s->srp_ctx.login == NULL)
194                         {
195                         /* RFC 5054 says SHOULD reject, 
196                            we do so if There is no srp login name */
197                         ret = SSL3_AL_FATAL;
198                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
199                         }
200                 else
201                         {
202                         ret = SSL_srp_server_param_with_username(s,al);
203                         }
204                 }
205         return ret;
206         }
207 #endif
208
209 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
210                         ssl3_accept,
211                         ssl_undefined_function,
212                         ssl3_get_server_method)
213
214 int ssl3_accept(SSL *s)
215         {
216         BUF_MEM *buf;
217         unsigned long alg_k,Time=(unsigned long)time(NULL);
218         void (*cb)(const SSL *ssl,int type,int val)=NULL;
219         int ret= -1;
220         int new_state,state,skip=0;
221
222         RAND_add(&Time,sizeof(Time),0);
223         ERR_clear_error();
224         clear_sys_error();
225
226         if (s->info_callback != NULL)
227                 cb=s->info_callback;
228         else if (s->ctx->info_callback != NULL)
229                 cb=s->ctx->info_callback;
230
231         /* init things to blank */
232         s->in_handshake++;
233         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
234
235         if (s->cert == NULL)
236                 {
237                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
238                 return(-1);
239                 }
240
241 #ifndef OPENSSL_NO_HEARTBEATS
242         /* If we're awaiting a HeartbeatResponse, pretend we
243          * already got and don't await it anymore, because
244          * Heartbeats don't make sense during handshakes anyway.
245          */
246         if (s->tlsext_hb_pending)
247                 {
248                 s->tlsext_hb_pending = 0;
249                 s->tlsext_hb_seq++;
250                 }
251 #endif
252
253         for (;;)
254                 {
255                 state=s->state;
256
257                 switch (s->state)
258                         {
259                 case SSL_ST_RENEGOTIATE:
260                         s->renegotiate=1;
261                         /* s->state=SSL_ST_ACCEPT; */
262
263                 case SSL_ST_BEFORE:
264                 case SSL_ST_ACCEPT:
265                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
266                 case SSL_ST_OK|SSL_ST_ACCEPT:
267
268                         s->server=1;
269                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
270
271                         if ((s->version>>8) != 3)
272                                 {
273                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
274                                 return -1;
275                                 }
276                         s->type=SSL_ST_ACCEPT;
277
278                         if (s->init_buf == NULL)
279                                 {
280                                 if ((buf=BUF_MEM_new()) == NULL)
281                                         {
282                                         ret= -1;
283                                         goto end;
284                                         }
285                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
286                                         {
287                                         ret= -1;
288                                         goto end;
289                                         }
290                                 s->init_buf=buf;
291                                 }
292
293                         if (!ssl3_setup_buffers(s))
294                                 {
295                                 ret= -1;
296                                 goto end;
297                                 }
298
299                         s->init_num=0;
300                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
301                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
302
303                         if (s->state != SSL_ST_RENEGOTIATE)
304                                 {
305                                 /* Ok, we now need to push on a buffering BIO so that
306                                  * the output is sent in a way that TCP likes :-)
307                                  */
308                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
309                                 
310                                 ssl3_init_finished_mac(s);
311                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
312                                 s->ctx->stats.sess_accept++;
313                                 }
314                         else if (!s->s3->send_connection_binding &&
315                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
316                                 {
317                                 /* Server attempting to renegotiate with
318                                  * client that doesn't support secure
319                                  * renegotiation.
320                                  */
321                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
322                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
323                                 ret = -1;
324                                 goto end;
325                                 }
326                         else
327                                 {
328                                 /* s->state == SSL_ST_RENEGOTIATE,
329                                  * we will just send a HelloRequest */
330                                 s->ctx->stats.sess_accept_renegotiate++;
331                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
332                                 }
333                         break;
334
335                 case SSL3_ST_SW_HELLO_REQ_A:
336                 case SSL3_ST_SW_HELLO_REQ_B:
337
338                         s->shutdown=0;
339                         ret=ssl3_send_hello_request(s);
340                         if (ret <= 0) goto end;
341                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
342                         s->state=SSL3_ST_SW_FLUSH;
343                         s->init_num=0;
344
345                         ssl3_init_finished_mac(s);
346                         break;
347
348                 case SSL3_ST_SW_HELLO_REQ_C:
349                         s->state=SSL_ST_OK;
350                         break;
351
352                 case SSL3_ST_SR_CLNT_HELLO_A:
353                 case SSL3_ST_SR_CLNT_HELLO_B:
354                 case SSL3_ST_SR_CLNT_HELLO_C:
355
356                         if (s->rwstate != SSL_X509_LOOKUP)
357                         {
358                                 ret=ssl3_get_client_hello(s);
359                                 if (ret <= 0) goto end;
360                         }
361 #ifndef OPENSSL_NO_SRP
362                         {
363                         int al;
364                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
365                                         {
366                                         /* callback indicates firther work to be done */
367                                         s->rwstate=SSL_X509_LOOKUP;
368                                         goto end;
369                                         }
370                         if (ret != SSL_ERROR_NONE)
371                                 {
372                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);    
373                                 /* This is not really an error but the only means to
374                                    for a client to detect whether srp is supported. */
375                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)      
376                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);                     
377                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;                       
378                                 ret= -1;
379                                 goto end;       
380                                 }
381                         }
382 #endif          
383                         
384                         s->renegotiate = 2;
385                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
386                         s->init_num=0;
387                         break;
388
389                 case SSL3_ST_SW_SRVR_HELLO_A:
390                 case SSL3_ST_SW_SRVR_HELLO_B:
391                         ret=ssl3_send_server_hello(s);
392                         if (ret <= 0) goto end;
393 #ifndef OPENSSL_NO_TLSEXT
394                         if (s->hit)
395                                 {
396                                 if (s->tlsext_ticket_expected)
397                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
398                                 else
399                                         s->state=SSL3_ST_SW_CHANGE_A;
400                                 }
401 #else
402                         if (s->hit)
403                                         s->state=SSL3_ST_SW_CHANGE_A;
404 #endif
405                         else
406                                 s->state=SSL3_ST_SW_CERT_A;
407                         s->init_num=0;
408                         break;
409
410                 case SSL3_ST_SW_CERT_A:
411                 case SSL3_ST_SW_CERT_B:
412                         /* Check if it is anon DH or anon ECDH, */
413                         /* normal PSK or KRB5 or SRP */
414                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
415                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
416                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
417                                 {
418                                 ret=ssl3_send_server_certificate(s);
419                                 if (ret <= 0) goto end;
420 #ifndef OPENSSL_NO_TLSEXT
421                                 if (s->tlsext_status_expected)
422                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
423                                 else
424                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
425                                 }
426                         else
427                                 {
428                                 skip = 1;
429                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
430                                 }
431 #else
432                                 }
433                         else
434                                 skip=1;
435
436                         s->state=SSL3_ST_SW_KEY_EXCH_A;
437 #endif
438                         s->init_num=0;
439                         break;
440
441                 case SSL3_ST_SW_KEY_EXCH_A:
442                 case SSL3_ST_SW_KEY_EXCH_B:
443                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
444
445                         /* clear this, it may get reset by
446                          * send_server_key_exchange */
447                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
448 #ifndef OPENSSL_NO_KRB5
449                                 && !(alg_k & SSL_kKRB5)
450 #endif /* OPENSSL_NO_KRB5 */
451                                 )
452                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
453                                  * even when forbidden by protocol specs
454                                  * (handshake may fail as clients are not required to
455                                  * be able to handle this) */
456                                 s->s3->tmp.use_rsa_tmp=1;
457                         else
458                                 s->s3->tmp.use_rsa_tmp=0;
459
460
461                         /* only send if a DH key exchange, fortezza or
462                          * RSA but we have a sign only certificate
463                          *
464                          * PSK: may send PSK identity hints
465                          *
466                          * For ECC ciphersuites, we send a serverKeyExchange
467                          * message only if the cipher suite is either
468                          * ECDH-anon or ECDHE. In other cases, the
469                          * server certificate contains the server's
470                          * public key for key exchange.
471                          */
472                         if (s->s3->tmp.use_rsa_tmp
473                         /* PSK: send ServerKeyExchange if PSK identity
474                          * hint if provided */
475 #ifndef OPENSSL_NO_PSK
476                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
477 #endif
478 #ifndef OPENSSL_NO_SRP
479                             /* SRP: send ServerKeyExchange */
480                             || (alg_k & SSL_kSRP)
481 #endif
482                             || (alg_k & SSL_kEDH)
483                             || (alg_k & SSL_kEECDH)
484                             || ((alg_k & SSL_kRSA)
485                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
486                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
487                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
488                                         )
489                                     )
490                                 )
491                             )
492                                 {
493                                 ret=ssl3_send_server_key_exchange(s);
494                                 if (ret <= 0) goto end;
495                                 }
496                         else
497                                 skip=1;
498
499                         s->state=SSL3_ST_SW_CERT_REQ_A;
500                         s->init_num=0;
501                         break;
502
503                 case SSL3_ST_SW_CERT_REQ_A:
504                 case SSL3_ST_SW_CERT_REQ_B:
505                         if (/* don't request cert unless asked for it: */
506                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
507                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
508                                  * don't request cert during re-negotiation: */
509                                 ((s->session->peer != NULL) &&
510                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
511                                 /* never request cert in anonymous ciphersuites
512                                  * (see section "Certificate request" in SSL 3 drafts
513                                  * and in RFC 2246): */
514                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
515                                  /* ... except when the application insists on verification
516                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
517                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
518                                  /* never request cert in Kerberos ciphersuites */
519                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
520                                 /* With normal PSK Certificates and
521                                  * Certificate Requests are omitted */
522                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
523                                 {
524                                 /* no cert request */
525                                 skip=1;
526                                 s->s3->tmp.cert_request=0;
527                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
528                                 if (s->s3->handshake_buffer)
529                                         if (!ssl3_digest_cached_records(s))
530                                                 return -1;
531                                 }
532                         else
533                                 {
534                                 s->s3->tmp.cert_request=1;
535                                 ret=ssl3_send_certificate_request(s);
536                                 if (ret <= 0) goto end;
537 #ifndef NETSCAPE_HANG_BUG
538                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
539 #else
540                                 s->state=SSL3_ST_SW_FLUSH;
541                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
542 #endif
543                                 s->init_num=0;
544                                 }
545                         break;
546
547                 case SSL3_ST_SW_SRVR_DONE_A:
548                 case SSL3_ST_SW_SRVR_DONE_B:
549                         ret=ssl3_send_server_done(s);
550                         if (ret <= 0) goto end;
551                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
552                         s->state=SSL3_ST_SW_FLUSH;
553                         s->init_num=0;
554                         break;
555                 
556                 case SSL3_ST_SW_FLUSH:
557
558                         /* This code originally checked to see if
559                          * any data was pending using BIO_CTRL_INFO
560                          * and then flushed. This caused problems
561                          * as documented in PR#1939. The proposed
562                          * fix doesn't completely resolve this issue
563                          * as buggy implementations of BIO_CTRL_PENDING
564                          * still exist. So instead we just flush
565                          * unconditionally.
566                          */
567
568                         s->rwstate=SSL_WRITING;
569                         if (BIO_flush(s->wbio) <= 0)
570                                 {
571                                 ret= -1;
572                                 goto end;
573                                 }
574                         s->rwstate=SSL_NOTHING;
575
576                         s->state=s->s3->tmp.next_state;
577                         break;
578
579                 case SSL3_ST_SR_CERT_A:
580                 case SSL3_ST_SR_CERT_B:
581                         /* Check for second client hello (MS SGC) */
582                         ret = ssl3_check_client_hello(s);
583                         if (ret <= 0)
584                                 goto end;
585                         if (ret == 2)
586                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
587                         else {
588                                 if (s->s3->tmp.cert_request)
589                                         {
590                                         ret=ssl3_get_client_certificate(s);
591                                         if (ret <= 0) goto end;
592                                         }
593                                 s->init_num=0;
594                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
595                         }
596                         break;
597
598                 case SSL3_ST_SR_KEY_EXCH_A:
599                 case SSL3_ST_SR_KEY_EXCH_B:
600                         ret=ssl3_get_client_key_exchange(s);
601                         if (ret <= 0)
602                                 goto end;
603                         if (ret == 2)
604                                 {
605                                 /* For the ECDH ciphersuites when
606                                  * the client sends its ECDH pub key in
607                                  * a certificate, the CertificateVerify
608                                  * message is not sent.
609                                  * Also for GOST ciphersuites when
610                                  * the client uses its key from the certificate
611                                  * for key exchange.
612                                  */
613 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
614                                 s->state=SSL3_ST_SR_FINISHED_A;
615 #else
616                                 if (s->s3->next_proto_neg_seen)
617                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
618                                 else
619                                         s->state=SSL3_ST_SR_FINISHED_A;
620 #endif
621                                 s->init_num = 0;
622                                 }
623                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
624                                 {
625                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
626                                 s->init_num=0;
627                                 if (!s->session->peer)
628                                         break;
629                                 /* For TLS v1.2 freeze the handshake buffer
630                                  * at this point and digest cached records.
631                                  */
632                                 if (!s->s3->handshake_buffer)
633                                         {
634                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
635                                         return -1;
636                                         }
637                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
638                                 if (!ssl3_digest_cached_records(s))
639                                         return -1;
640                                 }
641                         else
642                                 {
643                                 int offset=0;
644                                 int dgst_num;
645
646                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
647                                 s->init_num=0;
648
649                                 /* We need to get hashes here so if there is
650                                  * a client cert, it can be verified
651                                  * FIXME - digest processing for CertificateVerify
652                                  * should be generalized. But it is next step
653                                  */
654                                 if (s->s3->handshake_buffer)
655                                         if (!ssl3_digest_cached_records(s))
656                                                 return -1;
657                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
658                                         if (s->s3->handshake_dgst[dgst_num]) 
659                                                 {
660                                                 int dgst_size;
661
662                                                 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]));
663                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
664                                                 if (dgst_size < 0)
665                                                         {
666                                                         ret = -1;
667                                                         goto end;
668                                                         }
669                                                 offset+=dgst_size;
670                                                 }               
671                                 }
672                         break;
673
674                 case SSL3_ST_SR_CERT_VRFY_A:
675                 case SSL3_ST_SR_CERT_VRFY_B:
676
677                         /* we should decide if we expected this one */
678                         ret=ssl3_get_cert_verify(s);
679                         if (ret <= 0) goto end;
680
681 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
682                         s->state=SSL3_ST_SR_FINISHED_A;
683 #else
684                         if (s->s3->next_proto_neg_seen)
685                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
686                         else
687                                 s->state=SSL3_ST_SR_FINISHED_A;
688 #endif
689                         s->init_num=0;
690                         break;
691
692 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
693                 case SSL3_ST_SR_NEXT_PROTO_A:
694                 case SSL3_ST_SR_NEXT_PROTO_B:
695                         ret=ssl3_get_next_proto(s);
696                         if (ret <= 0) goto end;
697                         s->init_num = 0;
698                         s->state=SSL3_ST_SR_FINISHED_A;
699                         break;
700 #endif
701
702                 case SSL3_ST_SR_FINISHED_A:
703                 case SSL3_ST_SR_FINISHED_B:
704                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
705                                 SSL3_ST_SR_FINISHED_B);
706                         if (ret <= 0) goto end;
707                         if (s->hit)
708                                 s->state=SSL_ST_OK;
709 #ifndef OPENSSL_NO_TLSEXT
710                         else if (s->tlsext_ticket_expected)
711                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
712 #endif
713                         else
714                                 s->state=SSL3_ST_SW_CHANGE_A;
715                         s->init_num=0;
716                         break;
717
718 #ifndef OPENSSL_NO_TLSEXT
719                 case SSL3_ST_SW_SESSION_TICKET_A:
720                 case SSL3_ST_SW_SESSION_TICKET_B:
721                         ret=ssl3_send_newsession_ticket(s);
722                         if (ret <= 0) goto end;
723                         s->state=SSL3_ST_SW_CHANGE_A;
724                         s->init_num=0;
725                         break;
726
727                 case SSL3_ST_SW_CERT_STATUS_A:
728                 case SSL3_ST_SW_CERT_STATUS_B:
729                         ret=ssl3_send_cert_status(s);
730                         if (ret <= 0) goto end;
731                         s->state=SSL3_ST_SW_KEY_EXCH_A;
732                         s->init_num=0;
733                         break;
734
735 #endif
736
737                 case SSL3_ST_SW_CHANGE_A:
738                 case SSL3_ST_SW_CHANGE_B:
739
740                         s->session->cipher=s->s3->tmp.new_cipher;
741                         if (!s->method->ssl3_enc->setup_key_block(s))
742                                 { ret= -1; goto end; }
743
744                         ret=ssl3_send_change_cipher_spec(s,
745                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
746
747                         if (ret <= 0) goto end;
748                         s->state=SSL3_ST_SW_FINISHED_A;
749                         s->init_num=0;
750
751                         if (!s->method->ssl3_enc->change_cipher_state(s,
752                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
753                                 {
754                                 ret= -1;
755                                 goto end;
756                                 }
757
758                         break;
759
760                 case SSL3_ST_SW_FINISHED_A:
761                 case SSL3_ST_SW_FINISHED_B:
762                         ret=ssl3_send_finished(s,
763                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
764                                 s->method->ssl3_enc->server_finished_label,
765                                 s->method->ssl3_enc->server_finished_label_len);
766                         if (ret <= 0) goto end;
767                         s->state=SSL3_ST_SW_FLUSH;
768                         if (s->hit)
769                                 {
770 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
771                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
772 #else
773                                 if (s->s3->next_proto_neg_seen)
774                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
775                                 else
776                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
777 #endif
778                                 }
779                         else
780                                 s->s3->tmp.next_state=SSL_ST_OK;
781                         s->init_num=0;
782                         break;
783
784                 case SSL_ST_OK:
785                         /* clean a few things up */
786                         ssl3_cleanup_key_block(s);
787
788                         BUF_MEM_free(s->init_buf);
789                         s->init_buf=NULL;
790
791                         /* remove buffering on output */
792                         ssl_free_wbio_buffer(s);
793
794                         s->init_num=0;
795
796                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
797                                 {
798                                 s->renegotiate=0;
799                                 s->new_session=0;
800                                 
801                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
802                                 
803                                 s->ctx->stats.sess_accept_good++;
804                                 /* s->server=1; */
805                                 s->handshake_func=ssl3_accept;
806
807                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
808                                 }
809                         
810                         ret = 1;
811                         goto end;
812                         /* break; */
813
814                 default:
815                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
816                         ret= -1;
817                         goto end;
818                         /* break; */
819                         }
820                 
821                 if (!s->s3->tmp.reuse_message && !skip)
822                         {
823                         if (s->debug)
824                                 {
825                                 if ((ret=BIO_flush(s->wbio)) <= 0)
826                                         goto end;
827                                 }
828
829
830                         if ((cb != NULL) && (s->state != state))
831                                 {
832                                 new_state=s->state;
833                                 s->state=state;
834                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
835                                 s->state=new_state;
836                                 }
837                         }
838                 skip=0;
839                 }
840 end:
841         /* BIO_flush(s->wbio); */
842
843         s->in_handshake--;
844         if (cb != NULL)
845                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
846         return(ret);
847         }
848
849 int ssl3_send_hello_request(SSL *s)
850         {
851         unsigned char *p;
852
853         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
854                 {
855                 p=(unsigned char *)s->init_buf->data;
856                 *(p++)=SSL3_MT_HELLO_REQUEST;
857                 *(p++)=0;
858                 *(p++)=0;
859                 *(p++)=0;
860
861                 s->state=SSL3_ST_SW_HELLO_REQ_B;
862                 /* number of bytes to write */
863                 s->init_num=4;
864                 s->init_off=0;
865                 }
866
867         /* SSL3_ST_SW_HELLO_REQ_B */
868         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
869         }
870
871 int ssl3_check_client_hello(SSL *s)
872         {
873         int ok;
874         long n;
875
876         /* this function is called when we really expect a Certificate message,
877          * so permit appropriate message length */
878         n=s->method->ssl_get_message(s,
879                 SSL3_ST_SR_CERT_A,
880                 SSL3_ST_SR_CERT_B,
881                 -1,
882                 s->max_cert_list,
883                 &ok);
884         if (!ok) return((int)n);
885         s->s3->tmp.reuse_message = 1;
886         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
887                 {
888                 /* We only allow the client to restart the handshake once per
889                  * negotiation. */
890                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
891                         {
892                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
893                         return -1;
894                         }
895                 /* Throw away what we have done so far in the current handshake,
896                  * which will now be aborted. (A full SSL_clear would be too much.) */
897 #ifndef OPENSSL_NO_DH
898                 if (s->s3->tmp.dh != NULL)
899                         {
900                         DH_free(s->s3->tmp.dh);
901                         s->s3->tmp.dh = NULL;
902                         }
903 #endif
904 #ifndef OPENSSL_NO_ECDH
905                 if (s->s3->tmp.ecdh != NULL)
906                         {
907                         EC_KEY_free(s->s3->tmp.ecdh);
908                         s->s3->tmp.ecdh = NULL;
909                         }
910 #endif
911                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
912                 return 2;
913                 }
914         return 1;
915 }
916
917 int ssl3_get_client_hello(SSL *s)
918         {
919         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
920         unsigned int cookie_len;
921         long n;
922         unsigned long id;
923         unsigned char *p,*d,*q;
924         SSL_CIPHER *c;
925 #ifndef OPENSSL_NO_COMP
926         SSL_COMP *comp=NULL;
927 #endif
928         STACK_OF(SSL_CIPHER) *ciphers=NULL;
929
930         /* We do this so that we will respond with our native type.
931          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
932          * This down switching should be handled by a different method.
933          * If we are SSLv3, we will respond with SSLv3, even if prompted with
934          * TLSv1.
935          */
936         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
937                 )
938                 {
939                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
940                 }
941         s->first_packet=1;
942         n=s->method->ssl_get_message(s,
943                 SSL3_ST_SR_CLNT_HELLO_B,
944                 SSL3_ST_SR_CLNT_HELLO_C,
945                 SSL3_MT_CLIENT_HELLO,
946                 SSL3_RT_MAX_PLAIN_LENGTH,
947                 &ok);
948
949         if (!ok) return((int)n);
950         s->first_packet=0;
951         d=p=(unsigned char *)s->init_msg;
952
953         /* use version from inside client hello, not from record header
954          * (may differ: see RFC 2246, Appendix E, second paragraph) */
955         s->client_version=(((int)p[0])<<8)|(int)p[1];
956         p+=2;
957
958         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
959             (s->version != DTLS1_VERSION && s->client_version < s->version))
960                 {
961                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
962                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
963                         {
964                         /* similar to ssl3_get_record, send alert using remote version number */
965                         s->version = s->client_version;
966                         }
967                 al = SSL_AD_PROTOCOL_VERSION;
968                 goto f_err;
969                 }
970
971         /* If we require cookies and this ClientHello doesn't
972          * contain one, just return since we do not want to
973          * allocate any memory yet. So check cookie length...
974          */
975         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
976                 {
977                 unsigned int session_length, cookie_length;
978                 
979                 session_length = *(p + SSL3_RANDOM_SIZE);
980                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
981
982                 if (cookie_length == 0)
983                         return 1;
984                 }
985
986         /* load the client random */
987         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
988         p+=SSL3_RANDOM_SIZE;
989
990         /* get the session-id */
991         j= *(p++);
992
993         s->hit=0;
994         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
995          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
996          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
997          * than a change to default behavior so that applications relying on this for security
998          * won't even compile against older library versions).
999          *
1000          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1001          * renegotiation but not a new session (s->new_session remains unset): for servers,
1002          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1003          * setting will be ignored.
1004          */
1005         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1006                 {
1007                 if (!ssl_get_new_session(s,1))
1008                         goto err;
1009                 }
1010         else
1011                 {
1012                 i=ssl_get_prev_session(s, p, j, d + n);
1013                 if (i == 1)
1014                         { /* previous session */
1015                         s->hit=1;
1016                         }
1017                 else if (i == -1)
1018                         goto err;
1019                 else /* i == 0 */
1020                         {
1021                         if (!ssl_get_new_session(s,1))
1022                                 goto err;
1023                         }
1024                 }
1025
1026         p+=j;
1027
1028         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1029                 {
1030                 /* cookie stuff */
1031                 cookie_len = *(p++);
1032
1033                 /* 
1034                  * The ClientHello may contain a cookie even if the
1035                  * HelloVerify message has not been sent--make sure that it
1036                  * does not cause an overflow.
1037                  */
1038                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1039                         {
1040                         /* too much data */
1041                         al = SSL_AD_DECODE_ERROR;
1042                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1043                         goto f_err;
1044                         }
1045
1046                 /* verify the cookie if appropriate option is set. */
1047                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1048                         cookie_len > 0)
1049                         {
1050                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1051
1052                         if ( s->ctx->app_verify_cookie_cb != NULL)
1053                                 {
1054                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1055                                         cookie_len) == 0)
1056                                         {
1057                                         al=SSL_AD_HANDSHAKE_FAILURE;
1058                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1059                                                 SSL_R_COOKIE_MISMATCH);
1060                                         goto f_err;
1061                                         }
1062                                 /* else cookie verification succeeded */
1063                                 }
1064                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1065                                                   s->d1->cookie_len) != 0) /* default verification */
1066                                 {
1067                                         al=SSL_AD_HANDSHAKE_FAILURE;
1068                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1069                                                 SSL_R_COOKIE_MISMATCH);
1070                                         goto f_err;
1071                                 }
1072
1073                         ret = 2;
1074                         }
1075
1076                 p += cookie_len;
1077                 }
1078
1079         n2s(p,i);
1080         if ((i == 0) && (j != 0))
1081                 {
1082                 /* we need a cipher if we are not resuming a session */
1083                 al=SSL_AD_ILLEGAL_PARAMETER;
1084                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1085                 goto f_err;
1086                 }
1087         if ((p+i) >= (d+n))
1088                 {
1089                 /* not enough data */
1090                 al=SSL_AD_DECODE_ERROR;
1091                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1092                 goto f_err;
1093                 }
1094         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1095                 == NULL))
1096                 {
1097                 goto err;
1098                 }
1099         p+=i;
1100
1101         /* If it is a hit, check that the cipher is in the list */
1102         if ((s->hit) && (i > 0))
1103                 {
1104                 j=0;
1105                 id=s->session->cipher->id;
1106
1107 #ifdef CIPHER_DEBUG
1108                 printf("client sent %d ciphers\n",sk_num(ciphers));
1109 #endif
1110                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1111                         {
1112                         c=sk_SSL_CIPHER_value(ciphers,i);
1113 #ifdef CIPHER_DEBUG
1114                         printf("client [%2d of %2d]:%s\n",
1115                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1116 #endif
1117                         if (c->id == id)
1118                                 {
1119                                 j=1;
1120                                 break;
1121                                 }
1122                         }
1123 /* Disabled because it can be used in a ciphersuite downgrade
1124  * attack: CVE-2010-4180.
1125  */
1126 #if 0
1127                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1128                         {
1129                         /* Special case as client bug workaround: the previously used cipher may
1130                          * not be in the current list, the client instead might be trying to
1131                          * continue using a cipher that before wasn't chosen due to server
1132                          * preferences.  We'll have to reject the connection if the cipher is not
1133                          * enabled, though. */
1134                         c = sk_SSL_CIPHER_value(ciphers, 0);
1135                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1136                                 {
1137                                 s->session->cipher = c;
1138                                 j = 1;
1139                                 }
1140                         }
1141 #endif
1142                 if (j == 0)
1143                         {
1144                         /* we need to have the cipher in the cipher
1145                          * list if we are asked to reuse it */
1146                         al=SSL_AD_ILLEGAL_PARAMETER;
1147                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1148                         goto f_err;
1149                         }
1150                 }
1151
1152         /* compression */
1153         i= *(p++);
1154         if ((p+i) > (d+n))
1155                 {
1156                 /* not enough data */
1157                 al=SSL_AD_DECODE_ERROR;
1158                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1159                 goto f_err;
1160                 }
1161         q=p;
1162         for (j=0; j<i; j++)
1163                 {
1164                 if (p[j] == 0) break;
1165                 }
1166
1167         p+=i;
1168         if (j >= i)
1169                 {
1170                 /* no compress */
1171                 al=SSL_AD_DECODE_ERROR;
1172                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1173                 goto f_err;
1174                 }
1175
1176 #ifndef OPENSSL_NO_TLSEXT
1177         /* TLS extensions*/
1178         if (s->version >= SSL3_VERSION)
1179                 {
1180                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1181                         {
1182                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1183                         goto err;
1184                         }
1185                 }
1186
1187         /* Check if we want to use external pre-shared secret for this
1188          * handshake for not reused session only. We need to generate
1189          * server_random before calling tls_session_secret_cb in order to allow
1190          * SessionTicket processing to use it in key derivation. */
1191         {
1192                 unsigned long Time;
1193                 unsigned char *pos;
1194                 Time=(unsigned long)time(NULL);                 /* Time */
1195                 pos=s->s3->server_random;
1196                 l2n(Time,pos);
1197                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1198                         {
1199                         goto f_err;
1200                         }
1201         }
1202
1203         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1204                 {
1205                 SSL_CIPHER *pref_cipher=NULL;
1206
1207                 s->session->master_key_length=sizeof(s->session->master_key);
1208                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1209                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1210                         {
1211                         s->hit=1;
1212                         s->session->ciphers=ciphers;
1213                         s->session->verify_result=X509_V_OK;
1214
1215                         ciphers=NULL;
1216
1217                         /* check if some cipher was preferred by call back */
1218                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1219                         if (pref_cipher == NULL)
1220                                 {
1221                                 al=SSL_AD_HANDSHAKE_FAILURE;
1222                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1223                                 goto f_err;
1224                                 }
1225
1226                         s->session->cipher=pref_cipher;
1227
1228                         if (s->cipher_list)
1229                                 sk_SSL_CIPHER_free(s->cipher_list);
1230
1231                         if (s->cipher_list_by_id)
1232                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1233
1234                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1235                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1236                         }
1237                 }
1238 #endif
1239
1240         /* Worst case, we will use the NULL compression, but if we have other
1241          * options, we will now look for them.  We have i-1 compression
1242          * algorithms from the client, starting at q. */
1243         s->s3->tmp.new_compression=NULL;
1244 #ifndef OPENSSL_NO_COMP
1245         /* This only happens if we have a cache hit */
1246         if (s->session->compress_meth != 0)
1247                 {
1248                 int m, comp_id = s->session->compress_meth;
1249                 /* Perform sanity checks on resumed compression algorithm */
1250                 /* Can't disable compression */
1251                 if (s->options & SSL_OP_NO_COMPRESSION)
1252                         {
1253                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1254                         goto f_err;
1255                         }
1256                 /* Look for resumed compression method */
1257                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1258                         {
1259                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1260                         if (comp_id == comp->id)
1261                                 {
1262                                 s->s3->tmp.new_compression=comp;
1263                                 break;
1264                                 }
1265                         }
1266                 if (s->s3->tmp.new_compression == NULL)
1267                         {
1268                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1269                         goto f_err;
1270                         }
1271                 /* Look for resumed method in compression list */
1272                 for (m = 0; m < i; m++)
1273                         {
1274                         if (q[m] == comp_id)
1275                                 break;
1276                         }
1277                 if (m >= i)
1278                         {
1279                         al=SSL_AD_ILLEGAL_PARAMETER;
1280                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1281                         goto f_err;
1282                         }
1283                 }
1284         else if (s->hit)
1285                 comp = NULL;
1286         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1287                 { /* See if we have a match */
1288                 int m,nn,o,v,done=0;
1289
1290                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1291                 for (m=0; m<nn; m++)
1292                         {
1293                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1294                         v=comp->id;
1295                         for (o=0; o<i; o++)
1296                                 {
1297                                 if (v == q[o])
1298                                         {
1299                                         done=1;
1300                                         break;
1301                                         }
1302                                 }
1303                         if (done) break;
1304                         }
1305                 if (done)
1306                         s->s3->tmp.new_compression=comp;
1307                 else
1308                         comp=NULL;
1309                 }
1310 #else
1311         /* If compression is disabled we'd better not try to resume a session
1312          * using compression.
1313          */
1314         if (s->session->compress_meth != 0)
1315                 {
1316                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1317                 goto f_err;
1318                 }
1319 #endif
1320
1321         /* Given s->session->ciphers and SSL_get_ciphers, we must
1322          * pick a cipher */
1323
1324         if (!s->hit)
1325                 {
1326 #ifdef OPENSSL_NO_COMP
1327                 s->session->compress_meth=0;
1328 #else
1329                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1330 #endif
1331                 if (s->session->ciphers != NULL)
1332                         sk_SSL_CIPHER_free(s->session->ciphers);
1333                 s->session->ciphers=ciphers;
1334                 if (ciphers == NULL)
1335                         {
1336                         al=SSL_AD_ILLEGAL_PARAMETER;
1337                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1338                         goto f_err;
1339                         }
1340                 ciphers=NULL;
1341                 c=ssl3_choose_cipher(s,s->session->ciphers,
1342                                      SSL_get_ciphers(s));
1343
1344                 if (c == NULL)
1345                         {
1346                         al=SSL_AD_HANDSHAKE_FAILURE;
1347                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1348                         goto f_err;
1349                         }
1350                 s->s3->tmp.new_cipher=c;
1351                 /* check whether we should disable session resumption */
1352                 if (s->not_resumable_session_cb != NULL)
1353                         s->session->not_resumable=s->not_resumable_session_cb(s,
1354                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1355                 if (s->session->not_resumable)
1356                         /* do not send a session ticket */
1357                         s->tlsext_ticket_expected = 0;
1358                 }
1359         else
1360                 {
1361                 /* Session-id reuse */
1362 #ifdef REUSE_CIPHER_BUG
1363                 STACK_OF(SSL_CIPHER) *sk;
1364                 SSL_CIPHER *nc=NULL;
1365                 SSL_CIPHER *ec=NULL;
1366
1367                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1368                         {
1369                         sk=s->session->ciphers;
1370                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1371                                 {
1372                                 c=sk_SSL_CIPHER_value(sk,i);
1373                                 if (c->algorithm_enc & SSL_eNULL)
1374                                         nc=c;
1375                                 if (SSL_C_IS_EXPORT(c))
1376                                         ec=c;
1377                                 }
1378                         if (nc != NULL)
1379                                 s->s3->tmp.new_cipher=nc;
1380                         else if (ec != NULL)
1381                                 s->s3->tmp.new_cipher=ec;
1382                         else
1383                                 s->s3->tmp.new_cipher=s->session->cipher;
1384                         }
1385                 else
1386 #endif
1387                 s->s3->tmp.new_cipher=s->session->cipher;
1388                 }
1389
1390         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1391                 {
1392                 if (!ssl3_digest_cached_records(s))
1393                         goto f_err;
1394                 }
1395         
1396         /* we now have the following setup. 
1397          * client_random
1398          * cipher_list          - our prefered list of ciphers
1399          * ciphers              - the clients prefered list of ciphers
1400          * compression          - basically ignored right now
1401          * ssl version is set   - sslv3
1402          * s->session           - The ssl session has been setup.
1403          * s->hit               - session reuse flag
1404          * s->tmp.new_cipher    - the new cipher to use.
1405          */
1406
1407         if (ret < 0) ret=1;
1408         if (0)
1409                 {
1410 f_err:
1411                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1412                 }
1413 err:
1414         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1415         return(ret);
1416         }
1417
1418 int ssl3_send_server_hello(SSL *s)
1419         {
1420         unsigned char *buf;
1421         unsigned char *p,*d;
1422         int i,sl;
1423         unsigned long l;
1424 #ifdef OPENSSL_NO_TLSEXT
1425         unsigned long Time;
1426 #endif
1427
1428         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1429                 {
1430                 buf=(unsigned char *)s->init_buf->data;
1431 #ifdef OPENSSL_NO_TLSEXT
1432                 p=s->s3->server_random;
1433                 /* Generate server_random if it was not needed previously */
1434                 Time=(unsigned long)time(NULL);                 /* Time */
1435                 l2n(Time,p);
1436                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1437                         return -1;
1438 #endif
1439                 /* Do the message type and length last */
1440                 d=p= &(buf[4]);
1441
1442                 *(p++)=s->version>>8;
1443                 *(p++)=s->version&0xff;
1444
1445                 /* Random stuff */
1446                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1447                 p+=SSL3_RANDOM_SIZE;
1448
1449                 /* There are several cases for the session ID to send
1450                  * back in the server hello:
1451                  * - For session reuse from the session cache,
1452                  *   we send back the old session ID.
1453                  * - If stateless session reuse (using a session ticket)
1454                  *   is successful, we send back the client's "session ID"
1455                  *   (which doesn't actually identify the session).
1456                  * - If it is a new session, we send back the new
1457                  *   session ID.
1458                  * - However, if we want the new session to be single-use,
1459                  *   we send back a 0-length session ID.
1460                  * s->hit is non-zero in either case of session reuse,
1461                  * so the following won't overwrite an ID that we're supposed
1462                  * to send back.
1463                  */
1464                 if (s->session->not_resumable ||
1465                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1466                                 && !s->hit))
1467                         s->session->session_id_length=0;
1468
1469                 sl=s->session->session_id_length;
1470                 if (sl > (int)sizeof(s->session->session_id))
1471                         {
1472                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1473                         return -1;
1474                         }
1475                 *(p++)=sl;
1476                 memcpy(p,s->session->session_id,sl);
1477                 p+=sl;
1478
1479                 /* put the cipher */
1480                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1481                 p+=i;
1482
1483                 /* put the compression method */
1484 #ifdef OPENSSL_NO_COMP
1485                         *(p++)=0;
1486 #else
1487                 if (s->s3->tmp.new_compression == NULL)
1488                         *(p++)=0;
1489                 else
1490                         *(p++)=s->s3->tmp.new_compression->id;
1491 #endif
1492 #ifndef OPENSSL_NO_TLSEXT
1493                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1494                         {
1495                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1496                         return -1;
1497                         }
1498                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1499                         {
1500                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1501                         return -1;
1502                         }
1503 #endif
1504                 /* do the header */
1505                 l=(p-d);
1506                 d=buf;
1507                 *(d++)=SSL3_MT_SERVER_HELLO;
1508                 l2n3(l,d);
1509
1510                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1511                 /* number of bytes to write */
1512                 s->init_num=p-buf;
1513                 s->init_off=0;
1514                 }
1515
1516         /* SSL3_ST_SW_SRVR_HELLO_B */
1517         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1518         }
1519
1520 int ssl3_send_server_done(SSL *s)
1521         {
1522         unsigned char *p;
1523
1524         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1525                 {
1526                 p=(unsigned char *)s->init_buf->data;
1527
1528                 /* do the header */
1529                 *(p++)=SSL3_MT_SERVER_DONE;
1530                 *(p++)=0;
1531                 *(p++)=0;
1532                 *(p++)=0;
1533
1534                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1535                 /* number of bytes to write */
1536                 s->init_num=4;
1537                 s->init_off=0;
1538                 }
1539
1540         /* SSL3_ST_SW_SRVR_DONE_B */
1541         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1542         }
1543
1544 int ssl3_send_server_key_exchange(SSL *s)
1545         {
1546 #ifndef OPENSSL_NO_RSA
1547         unsigned char *q;
1548         int j,num;
1549         RSA *rsa;
1550         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1551         unsigned int u;
1552 #endif
1553 #ifndef OPENSSL_NO_DH
1554         DH *dh=NULL,*dhp;
1555 #endif
1556 #ifndef OPENSSL_NO_ECDH
1557         EC_KEY *ecdh=NULL, *ecdhp;
1558         unsigned char *encodedPoint = NULL;
1559         int encodedlen = 0;
1560         int curve_id = 0;
1561         BN_CTX *bn_ctx = NULL; 
1562 #endif
1563         EVP_PKEY *pkey;
1564         const EVP_MD *md = NULL;
1565         unsigned char *p,*d;
1566         int al,i;
1567         unsigned long type;
1568         int n;
1569         CERT *cert;
1570         BIGNUM *r[4];
1571         int nr[4],kn;
1572         BUF_MEM *buf;
1573         EVP_MD_CTX md_ctx;
1574
1575         EVP_MD_CTX_init(&md_ctx);
1576         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1577                 {
1578                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1579                 cert=s->cert;
1580
1581                 buf=s->init_buf;
1582
1583                 r[0]=r[1]=r[2]=r[3]=NULL;
1584                 n=0;
1585 #ifndef OPENSSL_NO_RSA
1586                 if (type & SSL_kRSA)
1587                         {
1588                         rsa=cert->rsa_tmp;
1589                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1590                                 {
1591                                 rsa=s->cert->rsa_tmp_cb(s,
1592                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1593                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1594                                 if(rsa == NULL)
1595                                 {
1596                                         al=SSL_AD_HANDSHAKE_FAILURE;
1597                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1598                                         goto f_err;
1599                                 }
1600                                 RSA_up_ref(rsa);
1601                                 cert->rsa_tmp=rsa;
1602                                 }
1603                         if (rsa == NULL)
1604                                 {
1605                                 al=SSL_AD_HANDSHAKE_FAILURE;
1606                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1607                                 goto f_err;
1608                                 }
1609                         r[0]=rsa->n;
1610                         r[1]=rsa->e;
1611                         s->s3->tmp.use_rsa_tmp=1;
1612                         }
1613                 else
1614 #endif
1615 #ifndef OPENSSL_NO_DH
1616                         if (type & SSL_kEDH)
1617                         {
1618                         dhp=cert->dh_tmp;
1619                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1620                                 dhp=s->cert->dh_tmp_cb(s,
1621                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1622                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1623                         if (dhp == NULL)
1624                                 {
1625                                 al=SSL_AD_HANDSHAKE_FAILURE;
1626                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1627                                 goto f_err;
1628                                 }
1629
1630                         if (s->s3->tmp.dh != NULL)
1631                                 {
1632                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1633                                 goto err;
1634                                 }
1635
1636                         if ((dh=DHparams_dup(dhp)) == NULL)
1637                                 {
1638                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1639                                 goto err;
1640                                 }
1641
1642                         s->s3->tmp.dh=dh;
1643                         if ((dhp->pub_key == NULL ||
1644                              dhp->priv_key == NULL ||
1645                              (s->options & SSL_OP_SINGLE_DH_USE)))
1646                                 {
1647                                 if(!DH_generate_key(dh))
1648                                     {
1649                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1650                                            ERR_R_DH_LIB);
1651                                     goto err;
1652                                     }
1653                                 }
1654                         else
1655                                 {
1656                                 dh->pub_key=BN_dup(dhp->pub_key);
1657                                 dh->priv_key=BN_dup(dhp->priv_key);
1658                                 if ((dh->pub_key == NULL) ||
1659                                         (dh->priv_key == NULL))
1660                                         {
1661                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1662                                         goto err;
1663                                         }
1664                                 }
1665                         r[0]=dh->p;
1666                         r[1]=dh->g;
1667                         r[2]=dh->pub_key;
1668                         }
1669                 else 
1670 #endif
1671 #ifndef OPENSSL_NO_ECDH
1672                         if (type & SSL_kEECDH)
1673                         {
1674                         const EC_GROUP *group;
1675
1676                         ecdhp=cert->ecdh_tmp;
1677                         if (s->cert->ecdh_tmp_auto)
1678                                 {
1679                                 /* Get NID of first shared curve */
1680                                 int nid = tls1_shared_curve(s, 0);
1681                                 if (nid != NID_undef)
1682                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1683                                 }
1684                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1685                                 {
1686                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1687                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1688                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1689                                 }
1690                         if (ecdhp == NULL)
1691                                 {
1692                                 al=SSL_AD_HANDSHAKE_FAILURE;
1693                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1694                                 goto f_err;
1695                                 }
1696
1697                         if (s->s3->tmp.ecdh != NULL)
1698                                 {
1699                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1700                                 goto err;
1701                                 }
1702
1703                         /* Duplicate the ECDH structure. */
1704                         if (ecdhp == NULL)
1705                                 {
1706                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1707                                 goto err;
1708                                 }
1709                         if (s->cert->ecdh_tmp_auto)
1710                                 ecdh = ecdhp;
1711                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1712                                 {
1713                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1714                                 goto err;
1715                                 }
1716
1717                         s->s3->tmp.ecdh=ecdh;
1718                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1719                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1720                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1721                                 {
1722                                 if(!EC_KEY_generate_key(ecdh))
1723                                     {
1724                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1725                                     goto err;
1726                                     }
1727                                 }
1728
1729                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1730                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1731                             (EC_KEY_get0_private_key(ecdh) == NULL))
1732                                 {
1733                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1734                                 goto err;
1735                                 }
1736
1737                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1738                             (EC_GROUP_get_degree(group) > 163)) 
1739                                 {
1740                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1741                                 goto err;
1742                                 }
1743
1744                         /* XXX: For now, we only support ephemeral ECDH
1745                          * keys over named (not generic) curves. For 
1746                          * supported named curves, curve_id is non-zero.
1747                          */
1748                         if ((curve_id = 
1749                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1750                             == 0)
1751                                 {
1752                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1753                                 goto err;
1754                                 }
1755
1756                         /* Encode the public key.
1757                          * First check the size of encoding and
1758                          * allocate memory accordingly.
1759                          */
1760                         encodedlen = EC_POINT_point2oct(group, 
1761                             EC_KEY_get0_public_key(ecdh),
1762                             POINT_CONVERSION_UNCOMPRESSED, 
1763                             NULL, 0, NULL);
1764
1765                         encodedPoint = (unsigned char *) 
1766                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1767                         bn_ctx = BN_CTX_new();
1768                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1769                                 {
1770                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1771                                 goto err;
1772                                 }
1773
1774
1775                         encodedlen = EC_POINT_point2oct(group, 
1776                             EC_KEY_get0_public_key(ecdh), 
1777                             POINT_CONVERSION_UNCOMPRESSED, 
1778                             encodedPoint, encodedlen, bn_ctx);
1779
1780                         if (encodedlen == 0) 
1781                                 {
1782                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1783                                 goto err;
1784                                 }
1785
1786                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1787
1788                         /* XXX: For now, we only support named (not 
1789                          * generic) curves in ECDH ephemeral key exchanges.
1790                          * In this situation, we need four additional bytes
1791                          * to encode the entire ServerECDHParams
1792                          * structure. 
1793                          */
1794                         n = 4 + encodedlen;
1795
1796                         /* We'll generate the serverKeyExchange message
1797                          * explicitly so we can set these to NULLs
1798                          */
1799                         r[0]=NULL;
1800                         r[1]=NULL;
1801                         r[2]=NULL;
1802                         r[3]=NULL;
1803                         }
1804                 else 
1805 #endif /* !OPENSSL_NO_ECDH */
1806 #ifndef OPENSSL_NO_PSK
1807                         if (type & SSL_kPSK)
1808                                 {
1809                                 /* reserve size for record length and PSK identity hint*/
1810                                 n+=2+strlen(s->ctx->psk_identity_hint);
1811                                 }
1812                         else
1813 #endif /* !OPENSSL_NO_PSK */
1814 #ifndef OPENSSL_NO_SRP
1815                 if (type & SSL_kSRP)
1816                         {
1817                         if ((s->srp_ctx.N == NULL) ||
1818                                 (s->srp_ctx.g == NULL) ||
1819                                 (s->srp_ctx.s == NULL) ||
1820                                 (s->srp_ctx.B == NULL))
1821                                 {
1822                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1823                                 goto err;
1824                                 }
1825                         r[0]=s->srp_ctx.N;
1826                         r[1]=s->srp_ctx.g;
1827                         r[2]=s->srp_ctx.s;
1828                         r[3]=s->srp_ctx.B;
1829                         }
1830                 else 
1831 #endif
1832                         {
1833                         al=SSL_AD_HANDSHAKE_FAILURE;
1834                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1835                         goto f_err;
1836                         }
1837                 for (i=0; r[i] != NULL && i<4; i++)
1838                         {
1839                         nr[i]=BN_num_bytes(r[i]);
1840 #ifndef OPENSSL_NO_SRP
1841                         if ((i == 2) && (type & SSL_kSRP))
1842                                 n+=1+nr[i];
1843                         else
1844 #endif
1845                         n+=2+nr[i];
1846                         }
1847
1848                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1849                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1850                         {
1851                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1852                                 == NULL)
1853                                 {
1854                                 al=SSL_AD_DECODE_ERROR;
1855                                 goto f_err;
1856                                 }
1857                         kn=EVP_PKEY_size(pkey);
1858                         }
1859                 else
1860                         {
1861                         pkey=NULL;
1862                         kn=0;
1863                         }
1864
1865                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1866                         {
1867                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1868                         goto err;
1869                         }
1870                 d=(unsigned char *)s->init_buf->data;
1871                 p= &(d[4]);
1872
1873                 for (i=0; r[i] != NULL && i<4; i++)
1874                         {
1875 #ifndef OPENSSL_NO_SRP
1876                         if ((i == 2) && (type & SSL_kSRP))
1877                                 {
1878                                 *p = nr[i];
1879                                 p++;
1880                                 }
1881                         else
1882 #endif
1883                         s2n(nr[i],p);
1884                         BN_bn2bin(r[i],p);
1885                         p+=nr[i];
1886                         }
1887
1888 #ifndef OPENSSL_NO_ECDH
1889                 if (type & SSL_kEECDH) 
1890                         {
1891                         /* XXX: For now, we only support named (not generic) curves.
1892                          * In this situation, the serverKeyExchange message has:
1893                          * [1 byte CurveType], [2 byte CurveName]
1894                          * [1 byte length of encoded point], followed by
1895                          * the actual encoded point itself
1896                          */
1897                         *p = NAMED_CURVE_TYPE;
1898                         p += 1;
1899                         *p = 0;
1900                         p += 1;
1901                         *p = curve_id;
1902                         p += 1;
1903                         *p = encodedlen;
1904                         p += 1;
1905                         memcpy((unsigned char*)p, 
1906                             (unsigned char *)encodedPoint, 
1907                             encodedlen);
1908                         OPENSSL_free(encodedPoint);
1909                         encodedPoint = NULL;
1910                         p += encodedlen;
1911                         }
1912 #endif
1913
1914 #ifndef OPENSSL_NO_PSK
1915                 if (type & SSL_kPSK)
1916                         {
1917                         /* copy PSK identity hint */
1918                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1919                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1920                         p+=strlen(s->ctx->psk_identity_hint);
1921                         }
1922 #endif
1923
1924                 /* not anonymous */
1925                 if (pkey != NULL)
1926                         {
1927                         /* n is the length of the params, they start at &(d[4])
1928                          * and p points to the space at the end. */
1929 #ifndef OPENSSL_NO_RSA
1930                         if (pkey->type == EVP_PKEY_RSA
1931                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1932                                 {
1933                                 q=md_buf;
1934                                 j=0;
1935                                 for (num=2; num > 0; num--)
1936                                         {
1937                                         EVP_MD_CTX_set_flags(&md_ctx,
1938                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1939                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1940                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1941                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1942                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1943                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1944                                         EVP_DigestFinal_ex(&md_ctx,q,
1945                                                 (unsigned int *)&i);
1946                                         q+=i;
1947                                         j+=i;
1948                                         }
1949                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1950                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1951                                         {
1952                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1953                                         goto err;
1954                                         }
1955                                 s2n(u,p);
1956                                 n+=u+2;
1957                                 }
1958                         else
1959 #endif
1960                         if (md)
1961                                 {
1962                                 /* For TLS1.2 and later send signature
1963                                  * algorithm */
1964                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1965                                         {
1966                                         if (!tls12_get_sigandhash(p, pkey, md))
1967                                                 {
1968                                                 /* Should never happen */
1969                                                 al=SSL_AD_INTERNAL_ERROR;
1970                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1971                                                 goto f_err;
1972                                                 }
1973                                         p+=2;
1974                                         }
1975 #ifdef SSL_DEBUG
1976                                 fprintf(stderr, "Using hash %s\n",
1977                                                         EVP_MD_name(md));
1978 #endif
1979                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1980                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1981                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1982                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1983                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1984                                         (unsigned int *)&i,pkey))
1985                                         {
1986                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1987                                         goto err;
1988                                         }
1989                                 s2n(i,p);
1990                                 n+=i+2;
1991                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1992                                         n+= 2;
1993                                 }
1994                         else
1995                                 {
1996                                 /* Is this error check actually needed? */
1997                                 al=SSL_AD_HANDSHAKE_FAILURE;
1998                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1999                                 goto f_err;
2000                                 }
2001                         }
2002
2003                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2004                 l2n3(n,d);
2005
2006                 /* we should now have things packed up, so lets send
2007                  * it off */
2008                 s->init_num=n+4;
2009                 s->init_off=0;
2010                 }
2011
2012         s->state = SSL3_ST_SW_KEY_EXCH_B;
2013         EVP_MD_CTX_cleanup(&md_ctx);
2014         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2015 f_err:
2016         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2017 err:
2018 #ifndef OPENSSL_NO_ECDH
2019         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2020         BN_CTX_free(bn_ctx);
2021 #endif
2022         EVP_MD_CTX_cleanup(&md_ctx);
2023         return(-1);
2024         }
2025
2026 int ssl3_send_certificate_request(SSL *s)
2027         {
2028         unsigned char *p,*d;
2029         int i,j,nl,off,n;
2030         STACK_OF(X509_NAME) *sk=NULL;
2031         X509_NAME *name;
2032         BUF_MEM *buf;
2033
2034         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2035                 {
2036                 buf=s->init_buf;
2037
2038                 d=p=(unsigned char *)&(buf->data[4]);
2039
2040                 /* get the list of acceptable cert types */
2041                 p++;
2042                 n=ssl3_get_req_cert_type(s,p);
2043                 d[0]=n;
2044                 p+=n;
2045                 n++;
2046
2047                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2048                         {
2049                         nl = tls12_get_req_sig_algs(s, p + 2);
2050                         s2n(nl, p);
2051                         p += nl + 2;
2052                         n += nl + 2;
2053                         }
2054
2055                 off=n;
2056                 p+=2;
2057                 n+=2;
2058
2059                 sk=SSL_get_client_CA_list(s);
2060                 nl=0;
2061                 if (sk != NULL)
2062                         {
2063                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2064                                 {
2065                                 name=sk_X509_NAME_value(sk,i);
2066                                 j=i2d_X509_NAME(name,NULL);
2067                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2068                                         {
2069                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2070                                         goto err;
2071                                         }
2072                                 p=(unsigned char *)&(buf->data[4+n]);
2073                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2074                                         {
2075                                         s2n(j,p);
2076                                         i2d_X509_NAME(name,&p);
2077                                         n+=2+j;
2078                                         nl+=2+j;
2079                                         }
2080                                 else
2081                                         {
2082                                         d=p;
2083                                         i2d_X509_NAME(name,&p);
2084                                         j-=2; s2n(j,d); j+=2;
2085                                         n+=j;
2086                                         nl+=j;
2087                                         }
2088                                 }
2089                         }
2090                 /* else no CA names */
2091                 p=(unsigned char *)&(buf->data[4+off]);
2092                 s2n(nl,p);
2093
2094                 d=(unsigned char *)buf->data;
2095                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2096                 l2n3(n,d);
2097
2098                 /* we should now have things packed up, so lets send
2099                  * it off */
2100
2101                 s->init_num=n+4;
2102                 s->init_off=0;
2103 #ifdef NETSCAPE_HANG_BUG
2104                 p=(unsigned char *)s->init_buf->data + s->init_num;
2105
2106                 /* do the header */
2107                 *(p++)=SSL3_MT_SERVER_DONE;
2108                 *(p++)=0;
2109                 *(p++)=0;
2110                 *(p++)=0;
2111                 s->init_num += 4;
2112 #endif
2113
2114                 s->state = SSL3_ST_SW_CERT_REQ_B;
2115                 }
2116
2117         /* SSL3_ST_SW_CERT_REQ_B */
2118         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2119 err:
2120         return(-1);
2121         }
2122
2123 int ssl3_get_client_key_exchange(SSL *s)
2124         {
2125         int i,al,ok;
2126         long n;
2127         unsigned long alg_k;
2128         unsigned char *p;
2129 #ifndef OPENSSL_NO_RSA
2130         RSA *rsa=NULL;
2131         EVP_PKEY *pkey=NULL;
2132 #endif
2133 #ifndef OPENSSL_NO_DH
2134         BIGNUM *pub=NULL;
2135         DH *dh_srvr, *dh_clnt = NULL;
2136 #endif
2137 #ifndef OPENSSL_NO_KRB5
2138         KSSL_ERR kssl_err;
2139 #endif /* OPENSSL_NO_KRB5 */
2140
2141 #ifndef OPENSSL_NO_ECDH
2142         EC_KEY *srvr_ecdh = NULL;
2143         EVP_PKEY *clnt_pub_pkey = NULL;
2144         EC_POINT *clnt_ecpoint = NULL;
2145         BN_CTX *bn_ctx = NULL; 
2146 #endif
2147
2148         n=s->method->ssl_get_message(s,
2149                 SSL3_ST_SR_KEY_EXCH_A,
2150                 SSL3_ST_SR_KEY_EXCH_B,
2151                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2152                 2048, /* ??? */
2153                 &ok);
2154
2155         if (!ok) return((int)n);
2156         p=(unsigned char *)s->init_msg;
2157
2158         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2159
2160 #ifndef OPENSSL_NO_RSA
2161         if (alg_k & SSL_kRSA)
2162                 {
2163                 /* FIX THIS UP EAY EAY EAY EAY */
2164                 if (s->s3->tmp.use_rsa_tmp)
2165                         {
2166                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2167                                 rsa=s->cert->rsa_tmp;
2168                         /* Don't do a callback because rsa_tmp should
2169                          * be sent already */
2170                         if (rsa == NULL)
2171                                 {
2172                                 al=SSL_AD_HANDSHAKE_FAILURE;
2173                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2174                                 goto f_err;
2175
2176                                 }
2177                         }
2178                 else
2179                         {
2180                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2181                         if (    (pkey == NULL) ||
2182                                 (pkey->type != EVP_PKEY_RSA) ||
2183                                 (pkey->pkey.rsa == NULL))
2184                                 {
2185                                 al=SSL_AD_HANDSHAKE_FAILURE;
2186                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2187                                 goto f_err;
2188                                 }
2189                         rsa=pkey->pkey.rsa;
2190                         }
2191
2192                 /* TLS and [incidentally] DTLS{0xFEFF} */
2193                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2194                         {
2195                         n2s(p,i);
2196                         if (n != i+2)
2197                                 {
2198                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2199                                         {
2200                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2201                                         goto err;
2202                                         }
2203                                 else
2204                                         p-=2;
2205                                 }
2206                         else
2207                                 n=i;
2208                         }
2209
2210                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2211
2212                 al = -1;
2213                 
2214                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2215                         {
2216                         al=SSL_AD_DECODE_ERROR;
2217                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2218                         }
2219
2220                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2221                         {
2222                         /* The premaster secret must contain the same version number as the
2223                          * ClientHello to detect version rollback attacks (strangely, the
2224                          * protocol does not offer such protection for DH ciphersuites).
2225                          * However, buggy clients exist that send the negotiated protocol
2226                          * version instead if the server does not support the requested
2227                          * protocol version.
2228                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2229                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2230                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2231                                 {
2232                                 al=SSL_AD_DECODE_ERROR;
2233                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2234
2235                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2236                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2237                                  * number check as a "bad version oracle" -- an alert would
2238                                  * reveal that the plaintext corresponding to some ciphertext
2239                                  * made up by the adversary is properly formatted except
2240                                  * that the version number is wrong.  To avoid such attacks,
2241                                  * we should treat this just like any other decryption error. */
2242                                 }
2243                         }
2244
2245                 if (al != -1)
2246                         {
2247                         /* Some decryption failure -- use random value instead as countermeasure
2248                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2249                          * (see RFC 2246, section 7.4.7.1). */
2250                         ERR_clear_error();
2251                         i = SSL_MAX_MASTER_KEY_LENGTH;
2252                         p[0] = s->client_version >> 8;
2253                         p[1] = s->client_version & 0xff;
2254                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2255                                 goto err;
2256                         }
2257         
2258                 s->session->master_key_length=
2259                         s->method->ssl3_enc->generate_master_secret(s,
2260                                 s->session->master_key,
2261                                 p,i);
2262                 OPENSSL_cleanse(p,i);
2263                 }
2264         else
2265 #endif
2266 #ifndef OPENSSL_NO_DH
2267                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2268                 {
2269                 int idx = -1;
2270                 EVP_PKEY *skey = NULL;
2271                 if (n)
2272                         n2s(p,i);
2273                 else
2274                         i = 0;
2275                 if (n && n != i+2)
2276                         {
2277                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2278                                 {
2279                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2280                                 goto err;
2281                                 }
2282                         else
2283                                 {
2284                                 p-=2;
2285                                 i=(int)n;
2286                                 }
2287                         }
2288                 if (alg_k & SSL_kDHr)
2289                         idx = SSL_PKEY_DH_RSA;
2290                 else if (alg_k & SSL_kDHd)
2291                         idx = SSL_PKEY_DH_DSA;
2292                 if (idx >= 0)
2293                         {
2294                         skey = s->cert->pkeys[idx].privatekey;
2295                         if ((skey == NULL) ||
2296                                 (skey->type != EVP_PKEY_DH) ||
2297                                 (skey->pkey.dh == NULL))
2298                                 {
2299                                 al=SSL_AD_HANDSHAKE_FAILURE;
2300                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2301                                 goto f_err;
2302                                 }
2303                         dh_srvr = skey->pkey.dh;
2304                         }
2305                 else if (s->s3->tmp.dh == NULL)
2306                         {
2307                         al=SSL_AD_HANDSHAKE_FAILURE;
2308                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2309                         goto f_err;
2310                         }
2311                 else
2312                         dh_srvr=s->s3->tmp.dh;
2313
2314                 if (n == 0L)
2315                         {
2316                         /* Get pubkey from cert */
2317                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2318                         if (clkey)
2319                                 {
2320                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2321                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2322                                 }
2323                         if (dh_clnt == NULL)
2324                                 {
2325                                 al=SSL_AD_HANDSHAKE_FAILURE;
2326                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2327                                 goto f_err;
2328                                 }
2329                         EVP_PKEY_free(clkey);
2330                         pub = dh_clnt->pub_key;
2331                         }
2332                 else
2333                         pub=BN_bin2bn(p,i,NULL);
2334                 if (pub == NULL)
2335                         {
2336                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2337                         goto err;
2338                         }
2339
2340                 i=DH_compute_key(p,pub,dh_srvr);
2341
2342                 if (i <= 0)
2343                         {
2344                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2345                         BN_clear_free(pub);
2346                         goto err;
2347                         }
2348
2349                 DH_free(s->s3->tmp.dh);
2350                 s->s3->tmp.dh=NULL;
2351                 if (dh_clnt)
2352                         DH_free(dh_clnt);
2353                 else
2354                         BN_clear_free(pub);
2355                 pub=NULL;
2356                 s->session->master_key_length=
2357                         s->method->ssl3_enc->generate_master_secret(s,
2358                                 s->session->master_key,p,i);
2359                 OPENSSL_cleanse(p,i);
2360                 if (dh_clnt)
2361                         return 2;
2362                 }
2363         else
2364 #endif
2365 #ifndef OPENSSL_NO_KRB5
2366         if (alg_k & SSL_kKRB5)
2367                 {
2368                 krb5_error_code         krb5rc;
2369                 krb5_data               enc_ticket;
2370                 krb5_data               authenticator;
2371                 krb5_data               enc_pms;
2372                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2373                 EVP_CIPHER_CTX          ciph_ctx;
2374                 const EVP_CIPHER        *enc = NULL;
2375                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2376                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2377                                                + EVP_MAX_BLOCK_LENGTH];
2378                 int                  padl, outl;
2379                 krb5_timestamp          authtime = 0;
2380                 krb5_ticket_times       ttimes;
2381
2382                 EVP_CIPHER_CTX_init(&ciph_ctx);
2383
2384                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2385
2386                 n2s(p,i);
2387                 enc_ticket.length = i;
2388
2389                 if (n < (long)(enc_ticket.length + 6))
2390                         {
2391                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2392                                 SSL_R_DATA_LENGTH_TOO_LONG);
2393                         goto err;
2394                         }
2395
2396                 enc_ticket.data = (char *)p;
2397                 p+=enc_ticket.length;
2398
2399                 n2s(p,i);
2400                 authenticator.length = i;
2401
2402                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2403                         {
2404                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2405                                 SSL_R_DATA_LENGTH_TOO_LONG);
2406                         goto err;
2407                         }
2408
2409                 authenticator.data = (char *)p;
2410                 p+=authenticator.length;
2411
2412                 n2s(p,i);
2413                 enc_pms.length = i;
2414                 enc_pms.data = (char *)p;
2415                 p+=enc_pms.length;
2416
2417                 /* Note that the length is checked again below,
2418                 ** after decryption
2419                 */
2420                 if(enc_pms.length > sizeof pms)
2421                         {
2422                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2423                                SSL_R_DATA_LENGTH_TOO_LONG);
2424                         goto err;
2425                         }
2426
2427                 if (n != (long)(enc_ticket.length + authenticator.length +
2428                                                 enc_pms.length + 6))
2429                         {
2430                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2431                                 SSL_R_DATA_LENGTH_TOO_LONG);
2432                         goto err;
2433                         }
2434
2435                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2436                                         &kssl_err)) != 0)
2437                         {
2438 #ifdef KSSL_DEBUG
2439                         printf("kssl_sget_tkt rtn %d [%d]\n",
2440                                 krb5rc, kssl_err.reason);
2441                         if (kssl_err.text)
2442                                 printf("kssl_err text= %s\n", kssl_err.text);
2443 #endif  /* KSSL_DEBUG */
2444                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2445                                 kssl_err.reason);
2446                         goto err;
2447                         }
2448
2449                 /*  Note: no authenticator is not considered an error,
2450                 **  but will return authtime == 0.
2451                 */
2452                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2453                                         &authtime, &kssl_err)) != 0)
2454                         {
2455 #ifdef KSSL_DEBUG
2456                         printf("kssl_check_authent rtn %d [%d]\n",
2457                                 krb5rc, kssl_err.reason);
2458                         if (kssl_err.text)
2459                                 printf("kssl_err text= %s\n", kssl_err.text);
2460 #endif  /* KSSL_DEBUG */
2461                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2462                                 kssl_err.reason);
2463                         goto err;
2464                         }
2465
2466                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2467                         {
2468                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2469                         goto err;
2470                         }
2471
2472 #ifdef KSSL_DEBUG
2473                 kssl_ctx_show(kssl_ctx);
2474 #endif  /* KSSL_DEBUG */
2475
2476                 enc = kssl_map_enc(kssl_ctx->enctype);
2477                 if (enc == NULL)
2478                     goto err;
2479
2480                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2481
2482                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2483                         {
2484                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2485                                 SSL_R_DECRYPTION_FAILED);
2486                         goto err;
2487                         }
2488                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2489                                         (unsigned char *)enc_pms.data, enc_pms.length))
2490                         {
2491                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2492                                 SSL_R_DECRYPTION_FAILED);
2493                         goto err;
2494                         }
2495                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2496                         {
2497                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2498                                 SSL_R_DATA_LENGTH_TOO_LONG);
2499                         goto err;
2500                         }
2501                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2502                         {
2503                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2504                                 SSL_R_DECRYPTION_FAILED);
2505                         goto err;
2506                         }
2507                 outl += padl;
2508                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2509                         {
2510                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2511                                 SSL_R_DATA_LENGTH_TOO_LONG);
2512                         goto err;
2513                         }
2514                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2515                     {
2516                     /* The premaster secret must contain the same version number as the
2517                      * ClientHello to detect version rollback attacks (strangely, the
2518                      * protocol does not offer such protection for DH ciphersuites).
2519                      * However, buggy clients exist that send random bytes instead of
2520                      * the protocol version.
2521                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2522                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2523                      */
2524                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2525                         {
2526                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2527                                SSL_AD_DECODE_ERROR);
2528                         goto err;
2529                         }
2530                     }
2531
2532                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2533
2534                 s->session->master_key_length=
2535                         s->method->ssl3_enc->generate_master_secret(s,
2536                                 s->session->master_key, pms, outl);
2537
2538                 if (kssl_ctx->client_princ)
2539                         {
2540                         size_t len = strlen(kssl_ctx->client_princ);
2541                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2542                                 {
2543                                 s->session->krb5_client_princ_len = len;
2544                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2545                                 }
2546                         }
2547
2548
2549                 /*  Was doing kssl_ctx_free() here,
2550                 **  but it caused problems for apache.
2551                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2552                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2553                 */
2554                 }
2555         else
2556 #endif  /* OPENSSL_NO_KRB5 */
2557
2558 #ifndef OPENSSL_NO_ECDH
2559                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2560                 {
2561                 int ret = 1;
2562                 int field_size = 0;
2563                 const EC_KEY   *tkey;
2564                 const EC_GROUP *group;
2565                 const BIGNUM *priv_key;
2566
2567                 /* initialize structures for server's ECDH key pair */
2568                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2569                         {
2570                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2571                             ERR_R_MALLOC_FAILURE);
2572                         goto err;
2573                         }
2574
2575                 /* Let's get server private key and group information */
2576                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2577                         { 
2578                         /* use the certificate */
2579                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2580                         }
2581                 else
2582                         {
2583                         /* use the ephermeral values we saved when
2584                          * generating the ServerKeyExchange msg.
2585                          */
2586                         tkey = s->s3->tmp.ecdh;
2587                         }
2588
2589                 group    = EC_KEY_get0_group(tkey);
2590                 priv_key = EC_KEY_get0_private_key(tkey);
2591
2592                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2593                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2594                         {
2595                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2596                                ERR_R_EC_LIB);
2597                         goto err;
2598                         }
2599
2600                 /* Let's get client's public key */
2601                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2602                         {
2603                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2604                             ERR_R_MALLOC_FAILURE);
2605                         goto err;
2606                         }
2607
2608                 if (n == 0L) 
2609                         {
2610                         /* Client Publickey was in Client Certificate */
2611
2612                          if (alg_k & SSL_kEECDH)
2613                                  {
2614                                  al=SSL_AD_HANDSHAKE_FAILURE;
2615                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2616                                  goto f_err;
2617                                  }
2618                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2619                             == NULL) || 
2620                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2621                                 {
2622                                 /* XXX: For now, we do not support client
2623                                  * authentication using ECDH certificates
2624                                  * so this branch (n == 0L) of the code is
2625                                  * never executed. When that support is
2626                                  * added, we ought to ensure the key 
2627                                  * received in the certificate is 
2628                                  * authorized for key agreement.
2629                                  * ECDH_compute_key implicitly checks that
2630                                  * the two ECDH shares are for the same
2631                                  * group.
2632                                  */
2633                                 al=SSL_AD_HANDSHAKE_FAILURE;
2634                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2635                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2636                                 goto f_err;
2637                                 }
2638
2639                         if (EC_POINT_copy(clnt_ecpoint,
2640                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2641                                 {
2642                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2643                                         ERR_R_EC_LIB);
2644                                 goto err;
2645                                 }
2646                         ret = 2; /* Skip certificate verify processing */
2647                         }
2648                 else
2649                         {
2650                         /* Get client's public key from encoded point
2651                          * in the ClientKeyExchange message.
2652                          */
2653                         if ((bn_ctx = BN_CTX_new()) == NULL)
2654                                 {
2655                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2656                                     ERR_R_MALLOC_FAILURE);
2657                                 goto err;
2658                                 }
2659
2660                         /* Get encoded point length */
2661                         i = *p; 
2662                         p += 1;
2663                         if (n != 1 + i)
2664                                 {
2665                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2666                                     ERR_R_EC_LIB);
2667                                 goto err;
2668                                 }
2669                         if (EC_POINT_oct2point(group, 
2670                             clnt_ecpoint, p, i, bn_ctx) == 0)
2671                                 {
2672                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2673                                     ERR_R_EC_LIB);
2674                                 goto err;
2675                                 }
2676                         /* p is pointing to somewhere in the buffer
2677                          * currently, so set it to the start 
2678                          */ 
2679                         p=(unsigned char *)s->init_buf->data;
2680                         }
2681
2682                 /* Compute the shared pre-master secret */
2683                 field_size = EC_GROUP_get_degree(group);
2684                 if (field_size <= 0)
2685                         {
2686                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2687                                ERR_R_ECDH_LIB);
2688                         goto err;
2689                         }
2690                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2691                 if (i <= 0)
2692                         {
2693                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2694                             ERR_R_ECDH_LIB);
2695                         goto err;
2696                         }
2697
2698                 EVP_PKEY_free(clnt_pub_pkey);
2699                 EC_POINT_free(clnt_ecpoint);
2700                 EC_KEY_free(srvr_ecdh);
2701                 BN_CTX_free(bn_ctx);
2702                 EC_KEY_free(s->s3->tmp.ecdh);
2703                 s->s3->tmp.ecdh = NULL; 
2704
2705                 /* Compute the master secret */
2706                 s->session->master_key_length = s->method->ssl3_enc-> \
2707                     generate_master_secret(s, s->session->master_key, p, i);
2708                 
2709                 OPENSSL_cleanse(p, i);
2710                 return (ret);
2711                 }
2712         else
2713 #endif
2714 #ifndef OPENSSL_NO_PSK
2715                 if (alg_k & SSL_kPSK)
2716                         {
2717                         unsigned char *t = NULL;
2718                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2719                         unsigned int pre_ms_len = 0, psk_len = 0;
2720                         int psk_err = 1;
2721                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2722
2723                         al=SSL_AD_HANDSHAKE_FAILURE;
2724
2725                         n2s(p,i);
2726                         if (n != i+2)
2727                                 {
2728                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2729                                         SSL_R_LENGTH_MISMATCH);
2730                                 goto psk_err;
2731                                 }
2732                         if (i > PSK_MAX_IDENTITY_LEN)
2733                                 {
2734                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2735                                         SSL_R_DATA_LENGTH_TOO_LONG);
2736                                 goto psk_err;
2737                                 }
2738                         if (s->psk_server_callback == NULL)
2739                                 {
2740                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2741                                        SSL_R_PSK_NO_SERVER_CB);
2742                                 goto psk_err;
2743                                 }
2744
2745                         /* Create guaranteed NULL-terminated identity
2746                          * string for the callback */
2747                         memcpy(tmp_id, p, i);
2748                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2749                         psk_len = s->psk_server_callback(s, tmp_id,
2750                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2751                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2752
2753                         if (psk_len > PSK_MAX_PSK_LEN)
2754                                 {
2755                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2756                                         ERR_R_INTERNAL_ERROR);
2757                                 goto psk_err;
2758                                 }
2759                         else if (psk_len == 0)
2760                                 {
2761                                 /* PSK related to the given identity not found */
2762                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2763                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2764                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2765                                 goto psk_err;
2766                                 }
2767
2768                         /* create PSK pre_master_secret */
2769                         pre_ms_len=2+psk_len+2+psk_len;
2770                         t = psk_or_pre_ms;
2771                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2772                         s2n(psk_len, t);
2773                         memset(t, 0, psk_len);
2774                         t+=psk_len;
2775                         s2n(psk_len, t);
2776
2777                         if (s->session->psk_identity != NULL)
2778                                 OPENSSL_free(s->session->psk_identity);
2779                         s->session->psk_identity = BUF_strdup((char *)p);
2780                         if (s->session->psk_identity == NULL)
2781                                 {
2782                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2783                                         ERR_R_MALLOC_FAILURE);
2784                                 goto psk_err;
2785                                 }
2786
2787                         if (s->session->psk_identity_hint != NULL)
2788                                 OPENSSL_free(s->session->psk_identity_hint);
2789                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2790                         if (s->ctx->psk_identity_hint != NULL &&
2791                                 s->session->psk_identity_hint == NULL)
2792                                 {
2793                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2794                                         ERR_R_MALLOC_FAILURE);
2795                                 goto psk_err;
2796                                 }
2797
2798                         s->session->master_key_length=
2799                                 s->method->ssl3_enc->generate_master_secret(s,
2800                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2801                         psk_err = 0;
2802                 psk_err:
2803                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2804                         if (psk_err != 0)
2805                                 goto f_err;
2806                         }
2807                 else
2808 #endif
2809 #ifndef OPENSSL_NO_SRP
2810                 if (alg_k & SSL_kSRP)
2811                         {
2812                         int param_len;
2813
2814                         n2s(p,i);
2815                         param_len=i+2;
2816                         if (param_len > n)
2817                                 {
2818                                 al=SSL_AD_DECODE_ERROR;
2819                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2820                                 goto f_err;
2821                                 }
2822                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2823                                 {
2824                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2825                                 goto err;
2826                                 }
2827                         if (s->session->srp_username != NULL)
2828                                 OPENSSL_free(s->session->srp_username);
2829                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2830                         if (s->session->srp_username == NULL)
2831                                 {
2832                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2833                                         ERR_R_MALLOC_FAILURE);
2834                                 goto err;
2835                                 }
2836
2837                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2838                                 {
2839                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2840                                 goto err;
2841                                 }
2842
2843                         p+=i;
2844                         }
2845                 else
2846 #endif  /* OPENSSL_NO_SRP */
2847                 if (alg_k & SSL_kGOST) 
2848                         {
2849                         int ret = 0;
2850                         EVP_PKEY_CTX *pkey_ctx;
2851                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2852                         unsigned char premaster_secret[32], *start;
2853                         size_t outlen=32, inlen;
2854                         unsigned long alg_a;
2855
2856                         /* Get our certificate private key*/
2857                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2858                         if (alg_a & SSL_aGOST94)
2859                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2860                         else if (alg_a & SSL_aGOST01)
2861                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2862
2863                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2864                         EVP_PKEY_decrypt_init(pkey_ctx);
2865                         /* If client certificate is present and is of the same type, maybe
2866                          * use it for key exchange.  Don't mind errors from
2867                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2868                          * a client certificate for authorization only. */
2869                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2870                         if (client_pub_pkey)
2871                                 {
2872                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2873                                         ERR_clear_error();
2874                                 }
2875                         /* Decrypt session key */
2876                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2877                                 {
2878                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2879                                 goto gerr;
2880                                 }
2881                         if (p[1] == 0x81)
2882                                 {
2883                                 start = p+3;
2884                                 inlen = p[2];
2885                                 }
2886                         else if (p[1] < 0x80)
2887                                 {
2888                                 start = p+2;
2889                                 inlen = p[1];
2890                                 }
2891                         else
2892                                 {
2893                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2894                                 goto gerr;
2895                                 }
2896                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2897
2898                                 {
2899                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2900                                 goto gerr;
2901                                 }
2902                         /* Generate master secret */
2903                         s->session->master_key_length=
2904                                 s->method->ssl3_enc->generate_master_secret(s,
2905                                         s->session->master_key,premaster_secret,32);
2906                         /* Check if pubkey from client certificate was used */
2907                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2908                                 ret = 2;
2909                         else
2910                                 ret = 1;
2911                 gerr:
2912                         EVP_PKEY_free(client_pub_pkey);
2913                         EVP_PKEY_CTX_free(pkey_ctx);
2914                         if (ret)
2915                                 return ret;
2916                         else
2917                                 goto err;
2918                         }
2919                 else
2920                 {
2921                 al=SSL_AD_HANDSHAKE_FAILURE;
2922                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2923                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2924                 goto f_err;
2925                 }
2926
2927         return(1);
2928 f_err:
2929         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2930 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2931 err:
2932 #endif
2933 #ifndef OPENSSL_NO_ECDH
2934         EVP_PKEY_free(clnt_pub_pkey);
2935         EC_POINT_free(clnt_ecpoint);
2936         if (srvr_ecdh != NULL) 
2937                 EC_KEY_free(srvr_ecdh);
2938         BN_CTX_free(bn_ctx);
2939 #endif
2940         return(-1);
2941         }
2942
2943 int ssl3_get_cert_verify(SSL *s)
2944         {
2945         EVP_PKEY *pkey=NULL;
2946         unsigned char *p;
2947         int al,ok,ret=0;
2948         long n;
2949         int type=0,i,j;
2950         X509 *peer;
2951         const EVP_MD *md = NULL;
2952         EVP_MD_CTX mctx;
2953         EVP_MD_CTX_init(&mctx);
2954
2955         n=s->method->ssl_get_message(s,
2956                 SSL3_ST_SR_CERT_VRFY_A,
2957                 SSL3_ST_SR_CERT_VRFY_B,
2958                 -1,
2959                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
2960                 &ok);
2961
2962         if (!ok) return((int)n);
2963
2964         if (s->session->peer != NULL)
2965                 {
2966                 peer=s->session->peer;
2967                 pkey=X509_get_pubkey(peer);
2968                 type=X509_certificate_type(peer,pkey);
2969                 }
2970         else
2971                 {
2972                 peer=NULL;
2973                 pkey=NULL;
2974                 }
2975
2976         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2977                 {
2978                 s->s3->tmp.reuse_message=1;
2979                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
2980                         {
2981                         al=SSL_AD_UNEXPECTED_MESSAGE;
2982                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2983                         goto f_err;
2984                         }
2985                 ret=1;
2986                 goto end;
2987                 }
2988
2989         if (peer == NULL)
2990                 {
2991                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2992                 al=SSL_AD_UNEXPECTED_MESSAGE;
2993                 goto f_err;
2994                 }
2995
2996         if (!(type & EVP_PKT_SIGN))
2997                 {
2998                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2999                 al=SSL_AD_ILLEGAL_PARAMETER;
3000                 goto f_err;
3001                 }
3002
3003         if (s->s3->change_cipher_spec)
3004                 {
3005                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3006                 al=SSL_AD_UNEXPECTED_MESSAGE;
3007                 goto f_err;
3008                 }
3009
3010         /* we now have a signature that we need to verify */
3011         p=(unsigned char *)s->init_msg;
3012         /* Check for broken implementations of GOST ciphersuites */
3013         /* If key is GOST and n is exactly 64, it is bare
3014          * signature without length field */
3015         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3016                 pkey->type == NID_id_GostR3410_2001) )
3017                 {
3018                 i=64;
3019                 } 
3020         else 
3021                 {       
3022                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3023                         {
3024                         int sigalg = tls12_get_sigid(pkey);
3025                         /* Should never happen */
3026                         if (sigalg == -1)
3027                                 {
3028                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3029                                 al=SSL_AD_INTERNAL_ERROR;
3030                                 goto f_err;
3031                                 }
3032                         /* Check key type is consistent with signature */
3033                         if (sigalg != (int)p[1])
3034                                 {
3035                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3036                                 al=SSL_AD_DECODE_ERROR;
3037                                 goto f_err;
3038                                 }
3039                         md = tls12_get_hash(p[0]);
3040                         if (md == NULL)
3041                                 {
3042                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3043                                 al=SSL_AD_DECODE_ERROR;
3044                                 goto f_err;
3045                                 }
3046 #ifdef SSL_DEBUG
3047 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3048 #endif
3049                         p += 2;
3050                         n -= 2;
3051                         }
3052                 n2s(p,i);
3053                 n-=2;
3054                 if (i > n)
3055                         {
3056                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3057                         al=SSL_AD_DECODE_ERROR;
3058                         goto f_err;
3059                         }
3060         }
3061         j=EVP_PKEY_size(pkey);
3062         if ((i > j) || (n > j) || (n <= 0))
3063                 {
3064                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3065                 al=SSL_AD_DECODE_ERROR;
3066                 goto f_err;
3067                 }
3068
3069         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3070                 {
3071                 long hdatalen = 0;
3072                 void *hdata;
3073                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3074                 if (hdatalen <= 0)
3075                         {
3076                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3077                         al=SSL_AD_INTERNAL_ERROR;
3078                         goto f_err;
3079                         }
3080 #ifdef SSL_DEBUG
3081                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3082                                                         EVP_MD_name(md));
3083 #endif
3084                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3085                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3086                         {
3087                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3088                         al=SSL_AD_INTERNAL_ERROR;
3089                         goto f_err;
3090                         }
3091
3092                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3093                         {
3094                         al=SSL_AD_DECRYPT_ERROR;
3095                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3096                         goto f_err;
3097                         }
3098                 }
3099         else
3100 #ifndef OPENSSL_NO_RSA 
3101         if (pkey->type == EVP_PKEY_RSA)
3102                 {
3103                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3104                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
3105                                                         pkey->pkey.rsa);
3106                 if (i < 0)
3107                         {
3108                         al=SSL_AD_DECRYPT_ERROR;
3109                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3110                         goto f_err;
3111                         }
3112                 if (i == 0)
3113                         {
3114                         al=SSL_AD_DECRYPT_ERROR;
3115                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3116                         goto f_err;
3117                         }
3118                 }
3119         else
3120 #endif
3121 #ifndef OPENSSL_NO_DSA
3122                 if (pkey->type == EVP_PKEY_DSA)
3123                 {
3124                 j=DSA_verify(pkey->save_type,
3125                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3126                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3127                 if (j <= 0)
3128                         {
3129                         /* bad signature */
3130                         al=SSL_AD_DECRYPT_ERROR;
3131                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3132                         goto f_err;
3133                         }
3134                 }
3135         else
3136 #endif
3137 #ifndef OPENSSL_NO_ECDSA
3138                 if (pkey->type == EVP_PKEY_EC)
3139                 {
3140                 j=ECDSA_verify(pkey->save_type,
3141                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3142                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3143                 if (j <= 0)
3144                         {
3145                         /* bad signature */
3146                         al=SSL_AD_DECRYPT_ERROR;
3147                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3148                             SSL_R_BAD_ECDSA_SIGNATURE);
3149                         goto f_err;
3150                         }
3151                 }
3152         else
3153 #endif
3154         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3155                 {   unsigned char signature[64];
3156                         int idx;
3157                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3158                         EVP_PKEY_verify_init(pctx);
3159                         if (i!=64) {
3160                                 fprintf(stderr,"GOST signature length is %d",i);
3161                         }       
3162                         for (idx=0;idx<64;idx++) {
3163                                 signature[63-idx]=p[idx];
3164                         }       
3165                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3166                         EVP_PKEY_CTX_free(pctx);
3167                         if (j<=0) 
3168                                 {
3169                                 al=SSL_AD_DECRYPT_ERROR;
3170                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3171                                         SSL_R_BAD_ECDSA_SIGNATURE);
3172                                 goto f_err;
3173                                 }       
3174                 }
3175         else    
3176                 {
3177                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3178                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3179                 goto f_err;
3180                 }
3181
3182
3183         ret=1;
3184         if (0)
3185                 {
3186 f_err:
3187                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3188                 }
3189 end:
3190         if (s->s3->handshake_buffer)
3191                 {
3192                 BIO_free(s->s3->handshake_buffer);
3193                 s->s3->handshake_buffer = NULL;
3194                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3195                 }
3196         EVP_MD_CTX_cleanup(&mctx);
3197         EVP_PKEY_free(pkey);
3198         return(ret);
3199         }
3200
3201 int ssl3_get_client_certificate(SSL *s)
3202         {
3203         int i,ok,al,ret= -1;
3204         X509 *x=NULL;
3205         unsigned long l,nc,llen,n;
3206         const unsigned char *p,*q;
3207         unsigned char *d;
3208         STACK_OF(X509) *sk=NULL;
3209
3210         n=s->method->ssl_get_message(s,
3211                 SSL3_ST_SR_CERT_A,
3212                 SSL3_ST_SR_CERT_B,
3213                 -1,
3214                 s->max_cert_list,
3215                 &ok);
3216
3217         if (!ok) return((int)n);
3218
3219         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3220                 {
3221                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3222                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3223                         {
3224                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3225                         al=SSL_AD_HANDSHAKE_FAILURE;
3226                         goto f_err;
3227                         }
3228                 /* If tls asked for a client cert, the client must return a 0 list */
3229                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3230                         {
3231                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3232                         al=SSL_AD_UNEXPECTED_MESSAGE;
3233                         goto f_err;
3234                         }
3235                 s->s3->tmp.reuse_message=1;
3236                 return(1);
3237                 }
3238
3239         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3240                 {
3241                 al=SSL_AD_UNEXPECTED_MESSAGE;
3242                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3243                 goto f_err;
3244                 }
3245         p=d=(unsigned char *)s->init_msg;
3246
3247         if ((sk=sk_X509_new_null()) == NULL)
3248                 {
3249                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3250                 goto err;
3251                 }
3252
3253         n2l3(p,llen);
3254         if (llen+3 != n)
3255                 {
3256                 al=SSL_AD_DECODE_ERROR;
3257                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3258                 goto f_err;
3259                 }
3260         for (nc=0; nc<llen; )
3261                 {
3262                 n2l3(p,l);
3263                 if ((l+nc+3) > llen)
3264                         {
3265                         al=SSL_AD_DECODE_ERROR;
3266                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3267                         goto f_err;
3268                         }
3269
3270                 q=p;
3271                 x=d2i_X509(NULL,&p,l);
3272                 if (x == NULL)
3273                         {
3274                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3275                         goto err;
3276                         }
3277                 if (p != (q+l))
3278                         {
3279                         al=SSL_AD_DECODE_ERROR;
3280                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3281                         goto f_err;
3282                         }
3283                 if (!sk_X509_push(sk,x))
3284                         {
3285                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3286                         goto err;
3287                         }
3288                 x=NULL;
3289                 nc+=l+3;
3290                 }
3291
3292         if (sk_X509_num(sk) <= 0)
3293                 {
3294                 /* TLS does not mind 0 certs returned */
3295                 if (s->version == SSL3_VERSION)
3296                         {
3297                         al=SSL_AD_HANDSHAKE_FAILURE;
3298                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3299                         goto f_err;
3300                         }
3301                 /* Fail for TLS only if we required a certificate */
3302                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3303                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3304                         {
3305                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3306                         al=SSL_AD_HANDSHAKE_FAILURE;
3307                         goto f_err;
3308                         }
3309                 /* No client certificate so digest cached records */
3310                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3311                         {
3312                         al=SSL_AD_INTERNAL_ERROR;
3313                         goto f_err;
3314                         }
3315                 }
3316         else
3317                 {
3318                 i=ssl_verify_cert_chain(s,sk);
3319                 if (i <= 0)
3320                         {
3321                         al=ssl_verify_alarm_type(s->verify_result);
3322                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3323                         goto f_err;
3324                         }
3325                 }
3326
3327         if (s->session->peer != NULL) /* This should not be needed */
3328                 X509_free(s->session->peer);
3329         s->session->peer=sk_X509_shift(sk);
3330         s->session->verify_result = s->verify_result;
3331
3332         /* With the current implementation, sess_cert will always be NULL
3333          * when we arrive here. */
3334         if (s->session->sess_cert == NULL)
3335                 {
3336                 s->session->sess_cert = ssl_sess_cert_new();
3337                 if (s->session->sess_cert == NULL)
3338                         {
3339                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3340                         goto err;
3341                         }
3342                 }
3343         if (s->session->sess_cert->cert_chain != NULL)
3344                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3345         s->session->sess_cert->cert_chain=sk;
3346         /* Inconsistency alert: cert_chain does *not* include the
3347          * peer's own certificate, while we do include it in s3_clnt.c */
3348
3349         sk=NULL;
3350
3351         ret=1;
3352         if (0)
3353                 {
3354 f_err:
3355                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3356                 }
3357 err:
3358         if (x != NULL) X509_free(x);
3359         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3360         return(ret);
3361         }
3362
3363 int ssl3_send_server_certificate(SSL *s)
3364         {
3365         unsigned long&n