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