RFC 5878 support.
[openssl.git] / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include <openssl/crypto.h>
156 #include "ssl_locl.h"
157 #include "kssl_lcl.h"
158 #include <openssl/buffer.h>
159 #include <openssl/rand.h>
160 #include <openssl/objects.h>
161 #include <openssl/evp.h>
162 #include <openssl/hmac.h>
163 #include <openssl/x509.h>
164 #ifndef OPENSSL_NO_DH
165 #include <openssl/dh.h>
166 #endif
167 #include <openssl/bn.h>
168 #ifndef OPENSSL_NO_KRB5
169 #include <openssl/krb5_asn.h>
170 #endif
171 #include <openssl/md5.h>
172
173 static const SSL_METHOD *ssl3_get_server_method(int ver);
174
175 static const SSL_METHOD *ssl3_get_server_method(int ver)
176         {
177         if (ver == SSL3_VERSION)
178                 return(SSLv3_server_method());
179         else
180                 return(NULL);
181         }
182
183 #ifndef OPENSSL_NO_SRP
184 static int ssl_check_srp_ext_ClientHello(SSL *s,int *al)
185         {
186         int ret = SSL_ERROR_NONE;
187
188         *al = SSL_AD_UNRECOGNIZED_NAME;
189
190         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
191             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
192                 {
193                 if(s->srp_ctx.login == NULL)
194                         {
195                         /* RFC 5054 says SHOULD reject, 
196                            we do so if There is no srp login name */
197                         ret = SSL3_AL_FATAL;
198                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
199                         }
200                 else
201                         {
202                         ret = SSL_srp_server_param_with_username(s,al);
203                         }
204                 }
205         return ret;
206         }
207 #endif
208
209 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
210                         ssl3_accept,
211                         ssl_undefined_function,
212                         ssl3_get_server_method)
213
214 int ssl3_accept(SSL *s)
215         {
216         BUF_MEM *buf;
217         unsigned long alg_k,Time=(unsigned long)time(NULL);
218         void (*cb)(const SSL *ssl,int type,int val)=NULL;
219         int ret= -1;
220         int new_state,state,skip=0;
221
222         RAND_add(&Time,sizeof(Time),0);
223         ERR_clear_error();
224         clear_sys_error();
225
226         if (s->info_callback != NULL)
227                 cb=s->info_callback;
228         else if (s->ctx->info_callback != NULL)
229                 cb=s->ctx->info_callback;
230
231         /* init things to blank */
232         s->in_handshake++;
233         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
234
235         if (s->cert == NULL)
236                 {
237                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
238                 return(-1);
239                 }
240
241 #ifndef OPENSSL_NO_HEARTBEATS
242         /* If we're awaiting a HeartbeatResponse, pretend we
243          * already got and don't await it anymore, because
244          * Heartbeats don't make sense during handshakes anyway.
245          */
246         if (s->tlsext_hb_pending)
247                 {
248                 s->tlsext_hb_pending = 0;
249                 s->tlsext_hb_seq++;
250                 }
251 #endif
252
253         for (;;)
254                 {
255                 state=s->state;
256
257                 switch (s->state)
258                         {
259                 case SSL_ST_RENEGOTIATE:
260                         s->renegotiate=1;
261                         /* s->state=SSL_ST_ACCEPT; */
262
263                 case SSL_ST_BEFORE:
264                 case SSL_ST_ACCEPT:
265                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
266                 case SSL_ST_OK|SSL_ST_ACCEPT:
267
268                         s->server=1;
269                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
270
271                         if ((s->version>>8) != 3)
272                                 {
273                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
274                                 return -1;
275                                 }
276                         s->type=SSL_ST_ACCEPT;
277
278                         if (s->init_buf == NULL)
279                                 {
280                                 if ((buf=BUF_MEM_new()) == NULL)
281                                         {
282                                         ret= -1;
283                                         goto end;
284                                         }
285                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
286                                         {
287                                         ret= -1;
288                                         goto end;
289                                         }
290                                 s->init_buf=buf;
291                                 }
292
293                         if (!ssl3_setup_buffers(s))
294                                 {
295                                 ret= -1;
296                                 goto end;
297                                 }
298
299                         s->init_num=0;
300                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
301                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
302
303                         if (s->state != SSL_ST_RENEGOTIATE)
304                                 {
305                                 /* Ok, we now need to push on a buffering BIO so that
306                                  * the output is sent in a way that TCP likes :-)
307                                  */
308                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
309                                 
310                                 ssl3_init_finished_mac(s);
311                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
312                                 s->ctx->stats.sess_accept++;
313                                 }
314                         else if (!s->s3->send_connection_binding &&
315                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
316                                 {
317                                 /* Server attempting to renegotiate with
318                                  * client that doesn't support secure
319                                  * renegotiation.
320                                  */
321                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
322                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
323                                 ret = -1;
324                                 goto end;
325                                 }
326                         else
327                                 {
328                                 /* s->state == SSL_ST_RENEGOTIATE,
329                                  * we will just send a HelloRequest */
330                                 s->ctx->stats.sess_accept_renegotiate++;
331                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
332                                 }
333                         break;
334
335                 case SSL3_ST_SW_HELLO_REQ_A:
336                 case SSL3_ST_SW_HELLO_REQ_B:
337
338                         s->shutdown=0;
339                         ret=ssl3_send_hello_request(s);
340                         if (ret <= 0) goto end;
341                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
342                         s->state=SSL3_ST_SW_FLUSH;
343                         s->init_num=0;
344
345                         ssl3_init_finished_mac(s);
346                         break;
347
348                 case SSL3_ST_SW_HELLO_REQ_C:
349                         s->state=SSL_ST_OK;
350                         break;
351
352                 case SSL3_ST_SR_CLNT_HELLO_A:
353                 case SSL3_ST_SR_CLNT_HELLO_B:
354                 case SSL3_ST_SR_CLNT_HELLO_C:
355
356                         if (s->rwstate != SSL_X509_LOOKUP)
357                         {
358                                 ret=ssl3_get_client_hello(s);
359                                 if (ret <= 0) goto end;
360                         }
361 #ifndef OPENSSL_NO_SRP
362                         {
363                         int al;
364                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
365                                         {
366                                         /* callback indicates firther work to be done */
367                                         s->rwstate=SSL_X509_LOOKUP;
368                                         goto end;
369                                         }
370                         if (ret != SSL_ERROR_NONE)
371                                 {
372                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);    
373                                 /* This is not really an error but the only means to
374                                    for a client to detect whether srp is supported. */
375                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)      
376                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);                     
377                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;                       
378                                 ret= -1;
379                                 goto end;       
380                                 }
381                         }
382 #endif          
383                         
384                         s->renegotiate = 2;
385                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
386                         s->init_num=0;
387                         break;
388
389                 case SSL3_ST_SW_SRVR_HELLO_A:
390                 case SSL3_ST_SW_SRVR_HELLO_B:
391                         ret=ssl3_send_server_hello(s);
392                         if (ret <= 0) goto end;
393 #ifndef OPENSSL_NO_TLSEXT
394                         if (s->hit)
395                                 {
396                                 if (s->tlsext_ticket_expected)
397                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
398                                 else
399                                         s->state=SSL3_ST_SW_CHANGE_A;
400                                 }
401 #else
402                         if (s->hit)
403                                         s->state=SSL3_ST_SW_CHANGE_A;
404 #endif
405                         else
406 #ifndef OPENSSL_NO_TLSEXT
407                                 s->state = SSL3_ST_SW_SUPPLEMENTAL_DATA_A;
408 #else
409                         s->state = SSL3_ST_SW_CERT_A;
410 #endif
411                         s->init_num = 0;
412                         break;
413
414 #ifndef OPENSSL_NO_TLSEXT
415                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_A:
416                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_B:
417                         /* We promised to send an audit proof in the hello. */
418                         if (s->s3->tlsext_authz_promised_to_client)
419                                 {
420                                 ret = tls1_send_server_supplemental_data(s);
421                                 if (ret <= 0) goto end;
422                                 }
423                         else
424                                 skip = 1;
425
426                         s->state = SSL3_ST_SW_CERT_A;
427                         s->init_num = 0;
428                         break;
429 #endif
430
431                 case SSL3_ST_SW_CERT_A:
432                 case SSL3_ST_SW_CERT_B:
433                         /* Check if it is anon DH or anon ECDH, */
434                         /* normal PSK or KRB5 or SRP */
435                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
436                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
437                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
438                                 {
439                                 ret=ssl3_send_server_certificate(s);
440                                 if (ret <= 0) goto end;
441 #ifndef OPENSSL_NO_TLSEXT
442                                 if (s->tlsext_status_expected)
443                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
444                                 else
445                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
446                                 }
447                         else
448                                 {
449                                 skip = 1;
450                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
451                                 }
452 #else
453                                 }
454                         else
455                                 skip=1;
456
457                         s->state=SSL3_ST_SW_KEY_EXCH_A;
458 #endif
459                         s->init_num=0;
460                         break;
461
462                 case SSL3_ST_SW_KEY_EXCH_A:
463                 case SSL3_ST_SW_KEY_EXCH_B:
464                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
465
466                         /* clear this, it may get reset by
467                          * send_server_key_exchange */
468                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
469 #ifndef OPENSSL_NO_KRB5
470                                 && !(alg_k & SSL_kKRB5)
471 #endif /* OPENSSL_NO_KRB5 */
472                                 )
473                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
474                                  * even when forbidden by protocol specs
475                                  * (handshake may fail as clients are not required to
476                                  * be able to handle this) */
477                                 s->s3->tmp.use_rsa_tmp=1;
478                         else
479                                 s->s3->tmp.use_rsa_tmp=0;
480
481
482                         /* only send if a DH key exchange, fortezza or
483                          * RSA but we have a sign only certificate
484                          *
485                          * PSK: may send PSK identity hints
486                          *
487                          * For ECC ciphersuites, we send a serverKeyExchange
488                          * message only if the cipher suite is either
489                          * ECDH-anon or ECDHE. In other cases, the
490                          * server certificate contains the server's
491                          * public key for key exchange.
492                          */
493                         if (s->s3->tmp.use_rsa_tmp
494                         /* PSK: send ServerKeyExchange if PSK identity
495                          * hint if provided */
496 #ifndef OPENSSL_NO_PSK
497                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
498 #endif
499 #ifndef OPENSSL_NO_SRP
500                             /* SRP: send ServerKeyExchange */
501                             || (alg_k & SSL_kSRP)
502 #endif
503                             || (alg_k & SSL_kEDH)
504                             || (alg_k & SSL_kEECDH)
505                             || ((alg_k & SSL_kRSA)
506                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
507                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
508                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
509                                         )
510                                     )
511                                 )
512                             )
513                                 {
514                                 ret=ssl3_send_server_key_exchange(s);
515                                 if (ret <= 0) goto end;
516                                 }
517                         else
518                                 skip=1;
519
520                         s->state=SSL3_ST_SW_CERT_REQ_A;
521                         s->init_num=0;
522                         break;
523
524                 case SSL3_ST_SW_CERT_REQ_A:
525                 case SSL3_ST_SW_CERT_REQ_B:
526                         if (/* don't request cert unless asked for it: */
527                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
528                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
529                                  * don't request cert during re-negotiation: */
530                                 ((s->session->peer != NULL) &&
531                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
532                                 /* never request cert in anonymous ciphersuites
533                                  * (see section "Certificate request" in SSL 3 drafts
534                                  * and in RFC 2246): */
535                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
536                                  /* ... except when the application insists on verification
537                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
538                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
539                                  /* never request cert in Kerberos ciphersuites */
540                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
541                                 /* With normal PSK Certificates and
542                                  * Certificate Requests are omitted */
543                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
544                                 {
545                                 /* no cert request */
546                                 skip=1;
547                                 s->s3->tmp.cert_request=0;
548                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
549                                 if (s->s3->handshake_buffer)
550                                         if (!ssl3_digest_cached_records(s))
551                                                 return -1;
552                                 }
553                         else
554                                 {
555                                 s->s3->tmp.cert_request=1;
556                                 ret=ssl3_send_certificate_request(s);
557                                 if (ret <= 0) goto end;
558 #ifndef NETSCAPE_HANG_BUG
559                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
560 #else
561                                 s->state=SSL3_ST_SW_FLUSH;
562                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
563 #endif
564                                 s->init_num=0;
565                                 }
566                         break;
567
568                 case SSL3_ST_SW_SRVR_DONE_A:
569                 case SSL3_ST_SW_SRVR_DONE_B:
570                         ret=ssl3_send_server_done(s);
571                         if (ret <= 0) goto end;
572                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
573                         s->state=SSL3_ST_SW_FLUSH;
574                         s->init_num=0;
575                         break;
576                 
577                 case SSL3_ST_SW_FLUSH:
578
579                         /* This code originally checked to see if
580                          * any data was pending using BIO_CTRL_INFO
581                          * and then flushed. This caused problems
582                          * as documented in PR#1939. The proposed
583                          * fix doesn't completely resolve this issue
584                          * as buggy implementations of BIO_CTRL_PENDING
585                          * still exist. So instead we just flush
586                          * unconditionally.
587                          */
588
589                         s->rwstate=SSL_WRITING;
590                         if (BIO_flush(s->wbio) <= 0)
591                                 {
592                                 ret= -1;
593                                 goto end;
594                                 }
595                         s->rwstate=SSL_NOTHING;
596
597                         s->state=s->s3->tmp.next_state;
598                         break;
599
600                 case SSL3_ST_SR_CERT_A:
601                 case SSL3_ST_SR_CERT_B:
602                         /* Check for second client hello (MS SGC) */
603                         ret = ssl3_check_client_hello(s);
604                         if (ret <= 0)
605                                 goto end;
606                         if (ret == 2)
607                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
608                         else {
609                                 if (s->s3->tmp.cert_request)
610                                         {
611                                         ret=ssl3_get_client_certificate(s);
612                                         if (ret <= 0) goto end;
613                                         }
614                                 s->init_num=0;
615                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
616                         }
617                         break;
618
619                 case SSL3_ST_SR_KEY_EXCH_A:
620                 case SSL3_ST_SR_KEY_EXCH_B:
621                         ret=ssl3_get_client_key_exchange(s);
622                         if (ret <= 0)
623                                 goto end;
624                         if (ret == 2)
625                                 {
626                                 /* For the ECDH ciphersuites when
627                                  * the client sends its ECDH pub key in
628                                  * a certificate, the CertificateVerify
629                                  * message is not sent.
630                                  * Also for GOST ciphersuites when
631                                  * the client uses its key from the certificate
632                                  * for key exchange.
633                                  */
634 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
635                                 s->state=SSL3_ST_SR_FINISHED_A;
636 #else
637                                 if (s->s3->next_proto_neg_seen)
638                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
639                                 else
640                                         s->state=SSL3_ST_SR_FINISHED_A;
641 #endif
642                                 s->init_num = 0;
643                                 }
644                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
645                                 {
646                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
647                                 s->init_num=0;
648                                 if (!s->session->peer)
649                                         break;
650                                 /* For TLS v1.2 freeze the handshake buffer
651                                  * at this point and digest cached records.
652                                  */
653                                 if (!s->s3->handshake_buffer)
654                                         {
655                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
656                                         return -1;
657                                         }
658                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
659                                 if (!ssl3_digest_cached_records(s))
660                                         return -1;
661                                 }
662                         else
663                                 {
664                                 int offset=0;
665                                 int dgst_num;
666
667                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
668                                 s->init_num=0;
669
670                                 /* We need to get hashes here so if there is
671                                  * a client cert, it can be verified
672                                  * FIXME - digest processing for CertificateVerify
673                                  * should be generalized. But it is next step
674                                  */
675                                 if (s->s3->handshake_buffer)
676                                         if (!ssl3_digest_cached_records(s))
677                                                 return -1;
678                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
679                                         if (s->s3->handshake_dgst[dgst_num]) 
680                                                 {
681                                                 int dgst_size;
682
683                                                 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]));
684                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
685                                                 if (dgst_size < 0)
686                                                         {
687                                                         ret = -1;
688                                                         goto end;
689                                                         }
690                                                 offset+=dgst_size;
691                                                 }               
692                                 }
693                         break;
694
695                 case SSL3_ST_SR_CERT_VRFY_A:
696                 case SSL3_ST_SR_CERT_VRFY_B:
697
698                         /* we should decide if we expected this one */
699                         ret=ssl3_get_cert_verify(s);
700                         if (ret <= 0) goto end;
701
702 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
703                         s->state=SSL3_ST_SR_FINISHED_A;
704 #else
705                         if (s->s3->next_proto_neg_seen)
706                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
707                         else
708                                 s->state=SSL3_ST_SR_FINISHED_A;
709 #endif
710                         s->init_num=0;
711                         break;
712
713 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
714                 case SSL3_ST_SR_NEXT_PROTO_A:
715                 case SSL3_ST_SR_NEXT_PROTO_B:
716                         ret=ssl3_get_next_proto(s);
717                         if (ret <= 0) goto end;
718                         s->init_num = 0;
719                         s->state=SSL3_ST_SR_FINISHED_A;
720                         break;
721 #endif
722
723                 case SSL3_ST_SR_FINISHED_A:
724                 case SSL3_ST_SR_FINISHED_B:
725                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
726                                 SSL3_ST_SR_FINISHED_B);
727                         if (ret <= 0) goto end;
728                         if (s->hit)
729                                 s->state=SSL_ST_OK;
730 #ifndef OPENSSL_NO_TLSEXT
731                         else if (s->tlsext_ticket_expected)
732                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
733 #endif
734                         else
735                                 s->state=SSL3_ST_SW_CHANGE_A;
736                         s->init_num=0;
737                         break;
738
739 #ifndef OPENSSL_NO_TLSEXT
740                 case SSL3_ST_SW_SESSION_TICKET_A:
741                 case SSL3_ST_SW_SESSION_TICKET_B:
742                         ret=ssl3_send_newsession_ticket(s);
743                         if (ret <= 0) goto end;
744                         s->state=SSL3_ST_SW_CHANGE_A;
745                         s->init_num=0;
746                         break;
747
748                 case SSL3_ST_SW_CERT_STATUS_A:
749                 case SSL3_ST_SW_CERT_STATUS_B:
750                         ret=ssl3_send_cert_status(s);
751                         if (ret <= 0) goto end;
752                         s->state=SSL3_ST_SW_KEY_EXCH_A;
753                         s->init_num=0;
754                         break;
755
756 #endif
757
758                 case SSL3_ST_SW_CHANGE_A:
759                 case SSL3_ST_SW_CHANGE_B:
760
761                         s->session->cipher=s->s3->tmp.new_cipher;
762                         if (!s->method->ssl3_enc->setup_key_block(s))
763                                 { ret= -1; goto end; }
764
765                         ret=ssl3_send_change_cipher_spec(s,
766                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
767
768                         if (ret <= 0) goto end;
769                         s->state=SSL3_ST_SW_FINISHED_A;
770                         s->init_num=0;
771
772                         if (!s->method->ssl3_enc->change_cipher_state(s,
773                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
774                                 {
775                                 ret= -1;
776                                 goto end;
777                                 }
778
779                         break;
780
781                 case SSL3_ST_SW_FINISHED_A:
782                 case SSL3_ST_SW_FINISHED_B:
783                         ret=ssl3_send_finished(s,
784                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
785                                 s->method->ssl3_enc->server_finished_label,
786                                 s->method->ssl3_enc->server_finished_label_len);
787                         if (ret <= 0) goto end;
788                         s->state=SSL3_ST_SW_FLUSH;
789                         if (s->hit)
790                                 {
791 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
792                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
793 #else
794                                 if (s->s3->next_proto_neg_seen)
795                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
796                                 else
797                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
798 #endif
799                                 }
800                         else
801                                 s->s3->tmp.next_state=SSL_ST_OK;
802                         s->init_num=0;
803                         break;
804
805                 case SSL_ST_OK:
806                         /* clean a few things up */
807                         ssl3_cleanup_key_block(s);
808
809                         BUF_MEM_free(s->init_buf);
810                         s->init_buf=NULL;
811
812                         /* remove buffering on output */
813                         ssl_free_wbio_buffer(s);
814
815                         s->init_num=0;
816
817                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
818                                 {
819                                 s->renegotiate=0;
820                                 s->new_session=0;
821                                 
822                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
823                                 
824                                 s->ctx->stats.sess_accept_good++;
825                                 /* s->server=1; */
826                                 s->handshake_func=ssl3_accept;
827
828                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
829                                 }
830                         
831                         ret = 1;
832                         goto end;
833                         /* break; */
834
835                 default:
836                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
837                         ret= -1;
838                         goto end;
839                         /* break; */
840                         }
841                 
842                 if (!s->s3->tmp.reuse_message && !skip)
843                         {
844                         if (s->debug)
845                                 {
846                                 if ((ret=BIO_flush(s->wbio)) <= 0)
847                                         goto end;
848                                 }
849
850
851                         if ((cb != NULL) && (s->state != state))
852                                 {
853                                 new_state=s->state;
854                                 s->state=state;
855                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
856                                 s->state=new_state;
857                                 }
858                         }
859                 skip=0;
860                 }
861 end:
862         /* BIO_flush(s->wbio); */
863
864         s->in_handshake--;
865         if (cb != NULL)
866                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
867         return(ret);
868         }
869
870 int ssl3_send_hello_request(SSL *s)
871         {
872         unsigned char *p;
873
874         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
875                 {
876                 p=(unsigned char *)s->init_buf->data;
877                 *(p++)=SSL3_MT_HELLO_REQUEST;
878                 *(p++)=0;
879                 *(p++)=0;
880                 *(p++)=0;
881
882                 s->state=SSL3_ST_SW_HELLO_REQ_B;
883                 /* number of bytes to write */
884                 s->init_num=4;
885                 s->init_off=0;
886                 }
887
888         /* SSL3_ST_SW_HELLO_REQ_B */
889         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
890         }
891
892 int ssl3_check_client_hello(SSL *s)
893         {
894         int ok;
895         long n;
896
897         /* this function is called when we really expect a Certificate message,
898          * so permit appropriate message length */
899         n=s->method->ssl_get_message(s,
900                 SSL3_ST_SR_CERT_A,
901                 SSL3_ST_SR_CERT_B,
902                 -1,
903                 s->max_cert_list,
904                 &ok);
905         if (!ok) return((int)n);
906         s->s3->tmp.reuse_message = 1;
907         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
908                 {
909                 /* We only allow the client to restart the handshake once per
910                  * negotiation. */
911                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
912                         {
913                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
914                         return -1;
915                         }
916                 /* Throw away what we have done so far in the current handshake,
917                  * which will now be aborted. (A full SSL_clear would be too much.) */
918 #ifndef OPENSSL_NO_DH
919                 if (s->s3->tmp.dh != NULL)
920                         {
921                         DH_free(s->s3->tmp.dh);
922                         s->s3->tmp.dh = NULL;
923                         }
924 #endif
925 #ifndef OPENSSL_NO_ECDH
926                 if (s->s3->tmp.ecdh != NULL)
927                         {
928                         EC_KEY_free(s->s3->tmp.ecdh);
929                         s->s3->tmp.ecdh = NULL;
930                         }
931 #endif
932                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
933                 return 2;
934                 }
935         return 1;
936 }
937
938 int ssl3_get_client_hello(SSL *s)
939         {
940         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
941         unsigned int cookie_len;
942         long n;
943         unsigned long id;
944         unsigned char *p,*d,*q;
945         SSL_CIPHER *c;
946 #ifndef OPENSSL_NO_COMP
947         SSL_COMP *comp=NULL;
948 #endif
949         STACK_OF(SSL_CIPHER) *ciphers=NULL;
950
951         /* We do this so that we will respond with our native type.
952          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
953          * This down switching should be handled by a different method.
954          * If we are SSLv3, we will respond with SSLv3, even if prompted with
955          * TLSv1.
956          */
957         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
958                 )
959                 {
960                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
961                 }
962         s->first_packet=1;
963         n=s->method->ssl_get_message(s,
964                 SSL3_ST_SR_CLNT_HELLO_B,
965                 SSL3_ST_SR_CLNT_HELLO_C,
966                 SSL3_MT_CLIENT_HELLO,
967                 SSL3_RT_MAX_PLAIN_LENGTH,
968                 &ok);
969
970         if (!ok) return((int)n);
971         s->first_packet=0;
972         d=p=(unsigned char *)s->init_msg;
973
974         /* use version from inside client hello, not from record header
975          * (may differ: see RFC 2246, Appendix E, second paragraph) */
976         s->client_version=(((int)p[0])<<8)|(int)p[1];
977         p+=2;
978
979         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
980             (s->version != DTLS1_VERSION && s->client_version < s->version))
981                 {
982                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
983                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
984                         {
985                         /* similar to ssl3_get_record, send alert using remote version number */
986                         s->version = s->client_version;
987                         }
988                 al = SSL_AD_PROTOCOL_VERSION;
989                 goto f_err;
990                 }
991
992         /* If we require cookies and this ClientHello doesn't
993          * contain one, just return since we do not want to
994          * allocate any memory yet. So check cookie length...
995          */
996         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
997                 {
998                 unsigned int session_length, cookie_length;
999                 
1000                 session_length = *(p + SSL3_RANDOM_SIZE);
1001                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
1002
1003                 if (cookie_length == 0)
1004                         return 1;
1005                 }
1006
1007         /* load the client random */
1008         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1009         p+=SSL3_RANDOM_SIZE;
1010
1011         /* get the session-id */
1012         j= *(p++);
1013
1014         s->hit=0;
1015         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1016          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1017          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1018          * than a change to default behavior so that applications relying on this for security
1019          * won't even compile against older library versions).
1020          *
1021          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1022          * renegotiation but not a new session (s->new_session remains unset): for servers,
1023          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1024          * setting will be ignored.
1025          */
1026         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1027                 {
1028                 if (!ssl_get_new_session(s,1))
1029                         goto err;
1030                 }
1031         else
1032                 {
1033                 i=ssl_get_prev_session(s, p, j, d + n);
1034                 if (i == 1)
1035                         { /* previous session */
1036                         s->hit=1;
1037                         }
1038                 else if (i == -1)
1039                         goto err;
1040                 else /* i == 0 */
1041                         {
1042                         if (!ssl_get_new_session(s,1))
1043                                 goto err;
1044                         }
1045                 }
1046
1047         p+=j;
1048
1049         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1050                 {
1051                 /* cookie stuff */
1052                 cookie_len = *(p++);
1053
1054                 /* 
1055                  * The ClientHello may contain a cookie even if the
1056                  * HelloVerify message has not been sent--make sure that it
1057                  * does not cause an overflow.
1058                  */
1059                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1060                         {
1061                         /* too much data */
1062                         al = SSL_AD_DECODE_ERROR;
1063                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1064                         goto f_err;
1065                         }
1066
1067                 /* verify the cookie if appropriate option is set. */
1068                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1069                         cookie_len > 0)
1070                         {
1071                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1072
1073                         if ( s->ctx->app_verify_cookie_cb != NULL)
1074                                 {
1075                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1076                                         cookie_len) == 0)
1077                                         {
1078                                         al=SSL_AD_HANDSHAKE_FAILURE;
1079                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1080                                                 SSL_R_COOKIE_MISMATCH);
1081                                         goto f_err;
1082                                         }
1083                                 /* else cookie verification succeeded */
1084                                 }
1085                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1086                                                   s->d1->cookie_len) != 0) /* default verification */
1087                                 {
1088                                         al=SSL_AD_HANDSHAKE_FAILURE;
1089                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1090                                                 SSL_R_COOKIE_MISMATCH);
1091                                         goto f_err;
1092                                 }
1093
1094                         ret = 2;
1095                         }
1096
1097                 p += cookie_len;
1098                 }
1099
1100         n2s(p,i);
1101         if ((i == 0) && (j != 0))
1102                 {
1103                 /* we need a cipher if we are not resuming a session */
1104                 al=SSL_AD_ILLEGAL_PARAMETER;
1105                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1106                 goto f_err;
1107                 }
1108         if ((p+i) >= (d+n))
1109                 {
1110                 /* not enough data */
1111                 al=SSL_AD_DECODE_ERROR;
1112                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1113                 goto f_err;
1114                 }
1115         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1116                 == NULL))
1117                 {
1118                 goto err;
1119                 }
1120         p+=i;
1121
1122         /* If it is a hit, check that the cipher is in the list */
1123         if ((s->hit) && (i > 0))
1124                 {
1125                 j=0;
1126                 id=s->session->cipher->id;
1127
1128 #ifdef CIPHER_DEBUG
1129                 printf("client sent %d ciphers\n",sk_num(ciphers));
1130 #endif
1131                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1132                         {
1133                         c=sk_SSL_CIPHER_value(ciphers,i);
1134 #ifdef CIPHER_DEBUG
1135                         printf("client [%2d of %2d]:%s\n",
1136                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1137 #endif
1138                         if (c->id == id)
1139                                 {
1140                                 j=1;
1141                                 break;
1142                                 }
1143                         }
1144 /* Disabled because it can be used in a ciphersuite downgrade
1145  * attack: CVE-2010-4180.
1146  */
1147 #if 0
1148                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1149                         {
1150                         /* Special case as client bug workaround: the previously used cipher may
1151                          * not be in the current list, the client instead might be trying to
1152                          * continue using a cipher that before wasn't chosen due to server
1153                          * preferences.  We'll have to reject the connection if the cipher is not
1154                          * enabled, though. */
1155                         c = sk_SSL_CIPHER_value(ciphers, 0);
1156                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1157                                 {
1158                                 s->session->cipher = c;
1159                                 j = 1;
1160                                 }
1161                         }
1162 #endif
1163                 if (j == 0)
1164                         {
1165                         /* we need to have the cipher in the cipher
1166                          * list if we are asked to reuse it */
1167                         al=SSL_AD_ILLEGAL_PARAMETER;
1168                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1169                         goto f_err;
1170                         }
1171                 }
1172
1173         /* compression */
1174         i= *(p++);
1175         if ((p+i) > (d+n))
1176                 {
1177                 /* not enough data */
1178                 al=SSL_AD_DECODE_ERROR;
1179                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1180                 goto f_err;
1181                 }
1182         q=p;
1183         for (j=0; j<i; j++)
1184                 {
1185                 if (p[j] == 0) break;
1186                 }
1187
1188         p+=i;
1189         if (j >= i)
1190                 {
1191                 /* no compress */
1192                 al=SSL_AD_DECODE_ERROR;
1193                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1194                 goto f_err;
1195                 }
1196
1197 #ifndef OPENSSL_NO_TLSEXT
1198         /* TLS extensions*/
1199         if (s->version >= SSL3_VERSION)
1200                 {
1201                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1202                         {
1203                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1204                         goto err;
1205                         }
1206                 }
1207
1208         /* Check if we want to use external pre-shared secret for this
1209          * handshake for not reused session only. We need to generate
1210          * server_random before calling tls_session_secret_cb in order to allow
1211          * SessionTicket processing to use it in key derivation. */
1212         {
1213                 unsigned long Time;
1214                 unsigned char *pos;
1215                 Time=(unsigned long)time(NULL);                 /* Time */
1216                 pos=s->s3->server_random;
1217                 l2n(Time,pos);
1218                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1219                         {
1220                         goto f_err;
1221                         }
1222         }
1223
1224         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1225                 {
1226                 SSL_CIPHER *pref_cipher=NULL;
1227
1228                 s->session->master_key_length=sizeof(s->session->master_key);
1229                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1230                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1231                         {
1232                         s->hit=1;
1233                         s->session->ciphers=ciphers;
1234                         s->session->verify_result=X509_V_OK;
1235
1236                         ciphers=NULL;
1237
1238                         /* check if some cipher was preferred by call back */
1239                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1240                         if (pref_cipher == NULL)
1241                                 {
1242                                 al=SSL_AD_HANDSHAKE_FAILURE;
1243                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1244                                 goto f_err;
1245                                 }
1246
1247                         s->session->cipher=pref_cipher;
1248
1249                         if (s->cipher_list)
1250                                 sk_SSL_CIPHER_free(s->cipher_list);
1251
1252                         if (s->cipher_list_by_id)
1253                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1254
1255                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1256                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1257                         }
1258                 }
1259 #endif
1260
1261         /* Worst case, we will use the NULL compression, but if we have other
1262          * options, we will now look for them.  We have i-1 compression
1263          * algorithms from the client, starting at q. */
1264         s->s3->tmp.new_compression=NULL;
1265 #ifndef OPENSSL_NO_COMP
1266         /* This only happens if we have a cache hit */
1267         if (s->session->compress_meth != 0)
1268                 {
1269                 int m, comp_id = s->session->compress_meth;
1270                 /* Perform sanity checks on resumed compression algorithm */
1271                 /* Can't disable compression */
1272                 if (s->options & SSL_OP_NO_COMPRESSION)
1273                         {
1274                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1275                         goto f_err;
1276                         }
1277                 /* Look for resumed compression method */
1278                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1279                         {
1280                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1281                         if (comp_id == comp->id)
1282                                 {
1283                                 s->s3->tmp.new_compression=comp;
1284                                 break;
1285                                 }
1286                         }
1287                 if (s->s3->tmp.new_compression == NULL)
1288                         {
1289                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1290                         goto f_err;
1291                         }
1292                 /* Look for resumed method in compression list */
1293                 for (m = 0; m < i; m++)
1294                         {
1295                         if (q[m] == comp_id)
1296                                 break;
1297                         }
1298                 if (m >= i)
1299                         {
1300                         al=SSL_AD_ILLEGAL_PARAMETER;
1301                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1302                         goto f_err;
1303                         }
1304                 }
1305         else if (s->hit)
1306                 comp = NULL;
1307         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1308                 { /* See if we have a match */
1309                 int m,nn,o,v,done=0;
1310
1311                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1312                 for (m=0; m<nn; m++)
1313                         {
1314                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1315                         v=comp->id;
1316                         for (o=0; o<i; o++)
1317                                 {
1318                                 if (v == q[o])
1319                                         {
1320                                         done=1;
1321                                         break;
1322                                         }
1323                                 }
1324                         if (done) break;
1325                         }
1326                 if (done)
1327                         s->s3->tmp.new_compression=comp;
1328                 else
1329                         comp=NULL;
1330                 }
1331 #else
1332         /* If compression is disabled we'd better not try to resume a session
1333          * using compression.
1334          */
1335         if (s->session->compress_meth != 0)
1336                 {
1337                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1338                 goto f_err;
1339                 }
1340 #endif
1341
1342         /* Given s->session->ciphers and SSL_get_ciphers, we must
1343          * pick a cipher */
1344
1345         if (!s->hit)
1346                 {
1347 #ifdef OPENSSL_NO_COMP
1348                 s->session->compress_meth=0;
1349 #else
1350                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1351 #endif
1352                 if (s->session->ciphers != NULL)
1353                         sk_SSL_CIPHER_free(s->session->ciphers);
1354                 s->session->ciphers=ciphers;
1355                 if (ciphers == NULL)
1356                         {
1357                         al=SSL_AD_ILLEGAL_PARAMETER;
1358                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1359                         goto f_err;
1360                         }
1361                 ciphers=NULL;
1362                 c=ssl3_choose_cipher(s,s->session->ciphers,
1363                                      SSL_get_ciphers(s));
1364
1365                 if (c == NULL)
1366                         {
1367                         al=SSL_AD_HANDSHAKE_FAILURE;
1368                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1369                         goto f_err;
1370                         }
1371                 s->s3->tmp.new_cipher=c;
1372                 /* check whether we should disable session resumption */
1373                 if (s->not_resumable_session_cb != NULL)
1374                         s->session->not_resumable=s->not_resumable_session_cb(s,
1375                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1376                 if (s->session->not_resumable)
1377                         /* do not send a session ticket */
1378                         s->tlsext_ticket_expected = 0;
1379                 }
1380         else
1381                 {
1382                 /* Session-id reuse */
1383 #ifdef REUSE_CIPHER_BUG
1384                 STACK_OF(SSL_CIPHER) *sk;
1385                 SSL_CIPHER *nc=NULL;
1386                 SSL_CIPHER *ec=NULL;
1387
1388                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1389                         {
1390                         sk=s->session->ciphers;
1391                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1392                                 {
1393                                 c=sk_SSL_CIPHER_value(sk,i);
1394                                 if (c->algorithm_enc & SSL_eNULL)
1395                                         nc=c;
1396                                 if (SSL_C_IS_EXPORT(c))
1397                                         ec=c;
1398                                 }
1399                         if (nc != NULL)
1400                                 s->s3->tmp.new_cipher=nc;
1401                         else if (ec != NULL)
1402                                 s->s3->tmp.new_cipher=ec;
1403                         else
1404                                 s->s3->tmp.new_cipher=s->session->cipher;
1405                         }
1406                 else
1407 #endif
1408                 s->s3->tmp.new_cipher=s->session->cipher;
1409                 }
1410
1411         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1412                 {
1413                 if (!ssl3_digest_cached_records(s))
1414                         goto f_err;
1415                 }
1416         
1417         /* we now have the following setup. 
1418          * client_random
1419          * cipher_list          - our prefered list of ciphers
1420          * ciphers              - the clients prefered list of ciphers
1421          * compression          - basically ignored right now
1422          * ssl version is set   - sslv3
1423          * s->session           - The ssl session has been setup.
1424          * s->hit               - session reuse flag
1425          * s->tmp.new_cipher    - the new cipher to use.
1426          */
1427
1428         if (ret < 0) ret=1;
1429         if (0)
1430                 {
1431 f_err:
1432                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1433                 }
1434 err:
1435         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1436         return(ret);
1437         }
1438
1439 int ssl3_send_server_hello(SSL *s)
1440         {
1441         unsigned char *buf;
1442         unsigned char *p,*d;
1443         int i,sl;
1444         unsigned long l;
1445 #ifdef OPENSSL_NO_TLSEXT
1446         unsigned long Time;
1447 #endif
1448
1449         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1450                 {
1451                 buf=(unsigned char *)s->init_buf->data;
1452 #ifdef OPENSSL_NO_TLSEXT
1453                 p=s->s3->server_random;
1454                 /* Generate server_random if it was not needed previously */
1455                 Time=(unsigned long)time(NULL);                 /* Time */
1456                 l2n(Time,p);
1457                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1458                         return -1;
1459 #endif
1460                 /* Do the message type and length last */
1461                 d=p= &(buf[4]);
1462
1463                 *(p++)=s->version>>8;
1464                 *(p++)=s->version&0xff;
1465
1466                 /* Random stuff */
1467                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1468                 p+=SSL3_RANDOM_SIZE;
1469
1470                 /* There are several cases for the session ID to send
1471                  * back in the server hello:
1472                  * - For session reuse from the session cache,
1473                  *   we send back the old session ID.
1474                  * - If stateless session reuse (using a session ticket)
1475                  *   is successful, we send back the client's "session ID"
1476                  *   (which doesn't actually identify the session).
1477                  * - If it is a new session, we send back the new
1478                  *   session ID.
1479                  * - However, if we want the new session to be single-use,
1480                  *   we send back a 0-length session ID.
1481                  * s->hit is non-zero in either case of session reuse,
1482                  * so the following won't overwrite an ID that we're supposed
1483                  * to send back.
1484                  */
1485                 if (s->session->not_resumable ||
1486                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1487                                 && !s->hit))
1488                         s->session->session_id_length=0;
1489
1490                 sl=s->session->session_id_length;
1491                 if (sl > (int)sizeof(s->session->session_id))
1492                         {
1493                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1494                         return -1;
1495                         }
1496                 *(p++)=sl;
1497                 memcpy(p,s->session->session_id,sl);
1498                 p+=sl;
1499
1500                 /* put the cipher */
1501                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1502                 p+=i;
1503
1504                 /* put the compression method */
1505 #ifdef OPENSSL_NO_COMP
1506                         *(p++)=0;
1507 #else
1508                 if (s->s3->tmp.new_compression == NULL)
1509                         *(p++)=0;
1510                 else
1511                         *(p++)=s->s3->tmp.new_compression->id;
1512 #endif
1513 #ifndef OPENSSL_NO_TLSEXT
1514                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1515                         {
1516                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1517                         return -1;
1518                         }
1519                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1520                         {
1521                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1522                         return -1;
1523                         }
1524 #endif
1525                 /* do the header */
1526                 l=(p-d);
1527                 d=buf;
1528                 *(d++)=SSL3_MT_SERVER_HELLO;
1529                 l2n3(l,d);
1530
1531                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1532                 /* number of bytes to write */
1533                 s->init_num=p-buf;
1534                 s->init_off=0;
1535                 }
1536
1537         /* SSL3_ST_SW_SRVR_HELLO_B */
1538         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1539         }
1540
1541 int ssl3_send_server_done(SSL *s)
1542         {
1543         unsigned char *p;
1544
1545         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1546                 {
1547                 p=(unsigned char *)s->init_buf->data;
1548
1549                 /* do the header */
1550                 *(p++)=SSL3_MT_SERVER_DONE;
1551                 *(p++)=0;
1552                 *(p++)=0;
1553                 *(p++)=0;
1554
1555                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1556                 /* number of bytes to write */
1557                 s->init_num=4;
1558                 s->init_off=0;
1559                 }
1560
1561         /* SSL3_ST_SW_SRVR_DONE_B */
1562         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1563         }
1564
1565 int ssl3_send_server_key_exchange(SSL *s)
1566         {
1567 #ifndef OPENSSL_NO_RSA
1568         unsigned char *q;
1569         int j,num;
1570         RSA *rsa;
1571         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1572         unsigned int u;
1573 #endif
1574 #ifndef OPENSSL_NO_DH
1575         DH *dh=NULL,*dhp;
1576 #endif
1577 #ifndef OPENSSL_NO_ECDH
1578         EC_KEY *ecdh=NULL, *ecdhp;
1579         unsigned char *encodedPoint = NULL;
1580         int encodedlen = 0;
1581         int curve_id = 0;
1582         BN_CTX *bn_ctx = NULL; 
1583 #endif
1584         EVP_PKEY *pkey;
1585         const EVP_MD *md = NULL;
1586         unsigned char *p,*d;
1587         int al,i;
1588         unsigned long type;
1589         int n;
1590         CERT *cert;
1591         BIGNUM *r[4];
1592         int nr[4],kn;
1593         BUF_MEM *buf;
1594         EVP_MD_CTX md_ctx;
1595
1596         EVP_MD_CTX_init(&md_ctx);
1597         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1598                 {
1599                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1600                 cert=s->cert;
1601
1602                 buf=s->init_buf;
1603
1604                 r[0]=r[1]=r[2]=r[3]=NULL;
1605                 n=0;
1606 #ifndef OPENSSL_NO_RSA
1607                 if (type & SSL_kRSA)
1608                         {
1609                         rsa=cert->rsa_tmp;
1610                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1611                                 {
1612                                 rsa=s->cert->rsa_tmp_cb(s,
1613                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1614                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1615                                 if(rsa == NULL)
1616                                 {
1617                                         al=SSL_AD_HANDSHAKE_FAILURE;
1618                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1619                                         goto f_err;
1620                                 }
1621                                 RSA_up_ref(rsa);
1622                                 cert->rsa_tmp=rsa;
1623                                 }
1624                         if (rsa == NULL)
1625                                 {
1626                                 al=SSL_AD_HANDSHAKE_FAILURE;
1627                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1628                                 goto f_err;
1629                                 }
1630                         r[0]=rsa->n;
1631                         r[1]=rsa->e;
1632                         s->s3->tmp.use_rsa_tmp=1;
1633                         }
1634                 else
1635 #endif
1636 #ifndef OPENSSL_NO_DH
1637                         if (type & SSL_kEDH)
1638                         {
1639                         dhp=cert->dh_tmp;
1640                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1641                                 dhp=s->cert->dh_tmp_cb(s,
1642                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1643                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1644                         if (dhp == NULL)
1645                                 {
1646                                 al=SSL_AD_HANDSHAKE_FAILURE;
1647                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1648                                 goto f_err;
1649                                 }
1650
1651                         if (s->s3->tmp.dh != NULL)
1652                                 {
1653                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1654                                 goto err;
1655                                 }
1656
1657                         if ((dh=DHparams_dup(dhp)) == NULL)
1658                                 {
1659                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1660                                 goto err;
1661                                 }
1662
1663                         s->s3->tmp.dh=dh;
1664                         if ((dhp->pub_key == NULL ||
1665                              dhp->priv_key == NULL ||
1666                              (s->options & SSL_OP_SINGLE_DH_USE)))
1667                                 {
1668                                 if(!DH_generate_key(dh))
1669                                     {
1670                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1671                                            ERR_R_DH_LIB);
1672                                     goto err;
1673                                     }
1674                                 }
1675                         else
1676                                 {
1677                                 dh->pub_key=BN_dup(dhp->pub_key);
1678                                 dh->priv_key=BN_dup(dhp->priv_key);
1679                                 if ((dh->pub_key == NULL) ||
1680                                         (dh->priv_key == NULL))
1681                                         {
1682                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1683                                         goto err;
1684                                         }
1685                                 }
1686                         r[0]=dh->p;
1687                         r[1]=dh->g;
1688                         r[2]=dh->pub_key;
1689                         }
1690                 else 
1691 #endif
1692 #ifndef OPENSSL_NO_ECDH
1693                         if (type & SSL_kEECDH)
1694                         {
1695                         const EC_GROUP *group;
1696
1697                         ecdhp=cert->ecdh_tmp;
1698                         if (s->cert->ecdh_tmp_auto)
1699                                 {
1700                                 /* Get NID of first shared curve */
1701                                 int nid = tls1_shared_curve(s, 0);
1702                                 if (nid != NID_undef)
1703                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1704                                 }
1705                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1706                                 {
1707                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1708                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1709                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1710                                 }
1711                         if (ecdhp == NULL)
1712                                 {
1713                                 al=SSL_AD_HANDSHAKE_FAILURE;
1714                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1715                                 goto f_err;
1716                                 }
1717
1718                         if (s->s3->tmp.ecdh != NULL)
1719                                 {
1720                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1721                                 goto err;
1722                                 }
1723
1724                         /* Duplicate the ECDH structure. */
1725                         if (ecdhp == NULL)
1726                                 {
1727                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1728                                 goto err;
1729                                 }
1730                         if (s->cert->ecdh_tmp_auto)
1731                                 ecdh = ecdhp;
1732                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1733                                 {
1734                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1735                                 goto err;
1736                                 }
1737
1738                         s->s3->tmp.ecdh=ecdh;
1739                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1740                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1741                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1742                                 {
1743                                 if(!EC_KEY_generate_key(ecdh))
1744                                     {
1745                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1746                                     goto err;
1747                                     }
1748                                 }
1749
1750                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1751                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1752                             (EC_KEY_get0_private_key(ecdh) == NULL))
1753                                 {
1754                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1755                                 goto err;
1756                                 }
1757
1758                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1759                             (EC_GROUP_get_degree(group) > 163)) 
1760                                 {
1761                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1762                                 goto err;
1763                                 }
1764
1765                         /* XXX: For now, we only support ephemeral ECDH
1766                          * keys over named (not generic) curves. For 
1767                          * supported named curves, curve_id is non-zero.
1768                          */
1769                         if ((curve_id = 
1770                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1771                             == 0)
1772                                 {
1773                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1774                                 goto err;
1775                                 }
1776
1777                         /* Encode the public key.
1778                          * First check the size of encoding and
1779                          * allocate memory accordingly.
1780                          */
1781                         encodedlen = EC_POINT_point2oct(group, 
1782                             EC_KEY_get0_public_key(ecdh),
1783                             POINT_CONVERSION_UNCOMPRESSED, 
1784                             NULL, 0, NULL);
1785
1786                         encodedPoint = (unsigned char *) 
1787                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1788                         bn_ctx = BN_CTX_new();
1789                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1790                                 {
1791                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1792                                 goto err;
1793                                 }
1794
1795
1796                         encodedlen = EC_POINT_point2oct(group, 
1797                             EC_KEY_get0_public_key(ecdh), 
1798                             POINT_CONVERSION_UNCOMPRESSED, 
1799                             encodedPoint, encodedlen, bn_ctx);
1800
1801                         if (encodedlen == 0) 
1802                                 {
1803                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1804                                 goto err;
1805                                 }
1806
1807                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1808
1809                         /* XXX: For now, we only support named (not 
1810                          * generic) curves in ECDH ephemeral key exchanges.
1811                          * In this situation, we need four additional bytes
1812                          * to encode the entire ServerECDHParams
1813                          * structure. 
1814                          */
1815                         n = 4 + encodedlen;
1816
1817                         /* We'll generate the serverKeyExchange message
1818                          * explicitly so we can set these to NULLs
1819                          */
1820                         r[0]=NULL;
1821                         r[1]=NULL;
1822                         r[2]=NULL;
1823                         r[3]=NULL;
1824                         }
1825                 else 
1826 #endif /* !OPENSSL_NO_ECDH */
1827 #ifndef OPENSSL_NO_PSK
1828                         if (type & SSL_kPSK)
1829                                 {
1830                                 /* reserve size for record length and PSK identity hint*/
1831                                 n+=2+strlen(s->ctx->psk_identity_hint);
1832                                 }
1833                         else
1834 #endif /* !OPENSSL_NO_PSK */
1835 #ifndef OPENSSL_NO_SRP
1836                 if (type & SSL_kSRP)
1837                         {
1838                         if ((s->srp_ctx.N == NULL) ||
1839                                 (s->srp_ctx.g == NULL) ||
1840                                 (s->srp_ctx.s == NULL) ||
1841                                 (s->srp_ctx.B == NULL))
1842                                 {
1843                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1844                                 goto err;
1845                                 }
1846                         r[0]=s->srp_ctx.N;
1847                         r[1]=s->srp_ctx.g;
1848                         r[2]=s->srp_ctx.s;
1849                         r[3]=s->srp_ctx.B;
1850                         }
1851                 else 
1852 #endif
1853                         {
1854                         al=SSL_AD_HANDSHAKE_FAILURE;
1855                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1856                         goto f_err;
1857                         }
1858                 for (i=0; r[i] != NULL && i<4; i++)
1859                         {
1860                         nr[i]=BN_num_bytes(r[i]);
1861 #ifndef OPENSSL_NO_SRP
1862                         if ((i == 2) && (type & SSL_kSRP))
1863                                 n+=1+nr[i];
1864                         else
1865 #endif
1866                         n+=2+nr[i];
1867                         }
1868
1869                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1870                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1871                         {
1872                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1873                                 == NULL)
1874                                 {
1875                                 al=SSL_AD_DECODE_ERROR;
1876                                 goto f_err;
1877                                 }
1878                         kn=EVP_PKEY_size(pkey);
1879                         }
1880                 else
1881                         {
1882                         pkey=NULL;
1883                         kn=0;
1884                         }
1885
1886                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1887                         {
1888                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1889                         goto err;
1890                         }
1891                 d=(unsigned char *)s->init_buf->data;
1892                 p= &(d[4]);
1893
1894                 for (i=0; r[i] != NULL && i<4; i++)
1895                         {
1896 #ifndef OPENSSL_NO_SRP
1897                         if ((i == 2) && (type & SSL_kSRP))
1898                                 {
1899                                 *p = nr[i];
1900                                 p++;
1901                                 }
1902                         else
1903 #endif
1904                         s2n(nr[i],p);
1905                         BN_bn2bin(r[i],p);
1906                         p+=nr[i];
1907                         }
1908
1909 #ifndef OPENSSL_NO_ECDH
1910                 if (type & SSL_kEECDH) 
1911                         {
1912                         /* XXX: For now, we only support named (not generic) curves.
1913                          * In this situation, the serverKeyExchange message has:
1914                          * [1 byte CurveType], [2 byte CurveName]
1915                          * [1 byte length of encoded point], followed by
1916                          * the actual encoded point itself
1917                          */
1918                         *p = NAMED_CURVE_TYPE;
1919                         p += 1;
1920                         *p = 0;
1921                         p += 1;
1922                         *p = curve_id;
1923                         p += 1;
1924                         *p = encodedlen;
1925                         p += 1;
1926                         memcpy((unsigned char*)p, 
1927                             (unsigned char *)encodedPoint, 
1928                             encodedlen);
1929                         OPENSSL_free(encodedPoint);
1930                         encodedPoint = NULL;
1931                         p += encodedlen;
1932                         }
1933 #endif
1934
1935 #ifndef OPENSSL_NO_PSK
1936                 if (type & SSL_kPSK)
1937                         {
1938                         /* copy PSK identity hint */
1939                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1940                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1941                         p+=strlen(s->ctx->psk_identity_hint);
1942                         }
1943 #endif
1944
1945                 /* not anonymous */
1946                 if (pkey != NULL)
1947                         {
1948                         /* n is the length of the params, they start at &(d[4])
1949                          * and p points to the space at the end. */
1950 #ifndef OPENSSL_NO_RSA
1951                         if (pkey->type == EVP_PKEY_RSA
1952                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1953                                 {
1954                                 q=md_buf;
1955                                 j=0;
1956                                 for (num=2; num > 0; num--)
1957                                         {
1958                                         EVP_MD_CTX_set_flags(&md_ctx,
1959                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1960                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1961                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1962                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1963                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1964                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1965                                         EVP_DigestFinal_ex(&md_ctx,q,
1966                                                 (unsigned int *)&i);
1967                                         q+=i;
1968                                         j+=i;
1969                                         }
1970                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1971                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1972                                         {
1973                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1974                                         goto err;
1975                                         }
1976                                 s2n(u,p);
1977                                 n+=u+2;
1978                                 }
1979                         else
1980 #endif
1981                         if (md)
1982                                 {
1983                                 /* For TLS1.2 and later send signature
1984                                  * algorithm */
1985                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1986                                         {
1987                                         if (!tls12_get_sigandhash(p, pkey, md))
1988                                                 {
1989                                                 /* Should never happen */
1990                                                 al=SSL_AD_INTERNAL_ERROR;
1991                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1992                                                 goto f_err;
1993                                                 }
1994                                         p+=2;
1995                                         }
1996 #ifdef SSL_DEBUG
1997                                 fprintf(stderr, "Using hash %s\n",
1998                                                         EVP_MD_name(md));
1999 #endif
2000                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2001                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2002                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2003                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
2004                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2005                                         (unsigned int *)&i,pkey))
2006                                         {
2007                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2008                                         goto err;
2009                                         }
2010                                 s2n(i,p);
2011                                 n+=i+2;
2012                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2013                                         n+= 2;
2014                                 }
2015                         else
2016                                 {
2017                                 /* Is this error check actually needed? */
2018                                 al=SSL_AD_HANDSHAKE_FAILURE;
2019                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2020                                 goto f_err;
2021                                 }
2022                         }
2023
2024                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2025                 l2n3(n,d);
2026
2027                 /* we should now have things packed up, so lets send
2028                  * it off */
2029                 s->init_num=n+4;
2030                 s->init_off=0;
2031                 }
2032
2033         s->state = SSL3_ST_SW_KEY_EXCH_B;
2034         EVP_MD_CTX_cleanup(&md_ctx);
2035         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2036 f_err:
2037         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2038 err:
2039 #ifndef OPENSSL_NO_ECDH
2040         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2041         BN_CTX_free(bn_ctx);
2042 #endif
2043         EVP_MD_CTX_cleanup(&md_ctx);
2044         return(-1);
2045         }
2046
2047 int ssl3_send_certificate_request(SSL *s)
2048         {
2049         unsigned char *p,*d;
2050         int i,j,nl,off,n;
2051         STACK_OF(X509_NAME) *sk=NULL;
2052         X509_NAME *name;
2053         BUF_MEM *buf;
2054
2055         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2056                 {
2057                 buf=s->init_buf;
2058
2059                 d=p=(unsigned char *)&(buf->data[4]);
2060
2061                 /* get the list of acceptable cert types */
2062                 p++;
2063                 n=ssl3_get_req_cert_type(s,p);
2064                 d[0]=n;
2065                 p+=n;
2066                 n++;
2067
2068                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2069                         {
2070                         nl = tls12_get_req_sig_algs(s, p + 2);
2071                         s2n(nl, p);
2072                         p += nl + 2;
2073                         n += nl + 2;
2074                         }
2075
2076                 off=n;
2077                 p+=2;
2078                 n+=2;
2079
2080                 sk=SSL_get_client_CA_list(s);
2081                 nl=0;
2082                 if (sk != NULL)
2083                         {
2084                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2085                                 {
2086                                 name=sk_X509_NAME_value(sk,i);
2087                                 j=i2d_X509_NAME(name,NULL);
2088                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2089                                         {
2090                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2091                                         goto err;
2092                                         }
2093                                 p=(unsigned char *)&(buf->data[4+n]);
2094                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2095                                         {
2096                                         s2n(j,p);
2097                                         i2d_X509_NAME(name,&p);
2098                                         n+=2+j;
2099                                         nl+=2+j;
2100                                         }
2101                                 else
2102                                         {
2103                                         d=p;
2104                                         i2d_X509_NAME(name,&p);
2105                                         j-=2; s2n(j,d); j+=2;
2106                                         n+=j;
2107                                         nl+=j;
2108                                         }
2109                                 }
2110                         }
2111                 /* else no CA names */
2112                 p=(unsigned char *)&(buf->data[4+off]);
2113                 s2n(nl,p);
2114
2115                 d=(unsigned char *)buf->data;
2116                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2117                 l2n3(n,d);
2118
2119                 /* we should now have things packed up, so lets send
2120                  * it off */
2121
2122                 s->init_num=n+4;
2123                 s->init_off=0;
2124 #ifdef NETSCAPE_HANG_BUG
2125                 p=(unsigned char *)s->init_buf->data + s->init_num;
2126
2127                 /* do the header */
2128                 *(p++)=SSL3_MT_SERVER_DONE;
2129                 *(p++)=0;
2130                 *(p++)=0;
2131                 *(p++)=0;
2132                 s->init_num += 4;
2133 #endif
2134
2135                 s->state = SSL3_ST_SW_CERT_REQ_B;
2136                 }
2137
2138         /* SSL3_ST_SW_CERT_REQ_B */
2139         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2140 err:
2141         return(-1);
2142         }
2143
2144 int ssl3_get_client_key_exchange(SSL *s)
2145         {
2146         int i,al,ok;
2147         long n;
2148         unsigned long alg_k;
2149         unsigned char *p;
2150 #ifndef OPENSSL_NO_RSA
2151         RSA *rsa=NULL;
2152         EVP_PKEY *pkey=NULL;
2153 #endif
2154 #ifndef OPENSSL_NO_DH
2155         BIGNUM *pub=NULL;
2156         DH *dh_srvr, *dh_clnt = NULL;
2157 #endif
2158 #ifndef OPENSSL_NO_KRB5
2159         KSSL_ERR kssl_err;
2160 #endif /* OPENSSL_NO_KRB5 */
2161
2162 #ifndef OPENSSL_NO_ECDH
2163         EC_KEY *srvr_ecdh = NULL;
2164         EVP_PKEY *clnt_pub_pkey = NULL;
2165         EC_POINT *clnt_ecpoint = NULL;
2166         BN_CTX *bn_ctx = NULL; 
2167 #endif
2168
2169         n=s->method->ssl_get_message(s,
2170                 SSL3_ST_SR_KEY_EXCH_A,
2171                 SSL3_ST_SR_KEY_EXCH_B,
2172                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2173                 2048, /* ??? */
2174                 &ok);
2175
2176         if (!ok) return((int)n);
2177         p=(unsigned char *)s->init_msg;
2178
2179         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2180
2181 #ifndef OPENSSL_NO_RSA
2182         if (alg_k & SSL_kRSA)
2183                 {
2184                 /* FIX THIS UP EAY EAY EAY EAY */
2185                 if (s->s3->tmp.use_rsa_tmp)
2186                         {
2187                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2188                                 rsa=s->cert->rsa_tmp;
2189                         /* Don't do a callback because rsa_tmp should
2190                          * be sent already */
2191                         if (rsa == NULL)
2192                                 {
2193                                 al=SSL_AD_HANDSHAKE_FAILURE;
2194                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2195                                 goto f_err;
2196
2197                                 }
2198                         }
2199                 else
2200                         {
2201                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2202                         if (    (pkey == NULL) ||
2203                                 (pkey->type != EVP_PKEY_RSA) ||
2204                                 (pkey->pkey.rsa == NULL))
2205                                 {
2206                                 al=SSL_AD_HANDSHAKE_FAILURE;
2207                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2208                                 goto f_err;
2209                                 }
2210                         rsa=pkey->pkey.rsa;
2211                         }
2212
2213                 /* TLS and [incidentally] DTLS{0xFEFF} */
2214                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2215                         {
2216                         n2s(p,i);
2217                         if (n != i+2)
2218                                 {
2219                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2220                                         {
2221                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2222                                         goto err;
2223                                         }
2224                                 else
2225                                         p-=2;
2226                                 }
2227                         else
2228                                 n=i;
2229                         }
2230
2231                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2232
2233                 al = -1;
2234                 
2235                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2236                         {
2237                         al=SSL_AD_DECODE_ERROR;
2238                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2239                         }
2240
2241                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2242                         {
2243                         /* The premaster secret must contain the same version number as the
2244                          * ClientHello to detect version rollback attacks (strangely, the
2245                          * protocol does not offer such protection for DH ciphersuites).
2246                          * However, buggy clients exist that send the negotiated protocol
2247                          * version instead if the server does not support the requested
2248                          * protocol version.
2249                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2250                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2251                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2252                                 {
2253                                 al=SSL_AD_DECODE_ERROR;
2254                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2255
2256                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2257                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2258                                  * number check as a "bad version oracle" -- an alert would
2259                                  * reveal that the plaintext corresponding to some ciphertext
2260                                  * made up by the adversary is properly formatted except
2261                                  * that the version number is wrong.  To avoid such attacks,
2262                                  * we should treat this just like any other decryption error. */
2263                                 }
2264                         }
2265
2266                 if (al != -1)
2267                         {
2268                         /* Some decryption failure -- use random value instead as countermeasure
2269                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2270                          * (see RFC 2246, section 7.4.7.1). */
2271                         ERR_clear_error();
2272                         i = SSL_MAX_MASTER_KEY_LENGTH;
2273                         p[0] = s->client_version >> 8;
2274                         p[1] = s->client_version & 0xff;
2275                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2276                                 goto err;
2277                         }
2278         
2279                 s->session->master_key_length=
2280                         s->method->ssl3_enc->generate_master_secret(s,
2281                                 s->session->master_key,
2282                                 p,i);
2283                 OPENSSL_cleanse(p,i);
2284                 }
2285         else
2286 #endif
2287 #ifndef OPENSSL_NO_DH
2288                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2289                 {
2290                 int idx = -1;
2291                 EVP_PKEY *skey = NULL;
2292                 if (n)
2293                         n2s(p,i);
2294                 else
2295                         i = 0;
2296                 if (n && n != i+2)
2297                         {
2298                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2299                                 {
2300                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2301                                 goto err;
2302                                 }
2303                         else
2304                                 {
2305                                 p-=2;
2306                                 i=(int)n;
2307                                 }
2308                         }
2309                 if (alg_k & SSL_kDHr)
2310                         idx = SSL_PKEY_DH_RSA;
2311                 else if (alg_k & SSL_kDHd)
2312                         idx = SSL_PKEY_DH_DSA;
2313                 if (idx >= 0)
2314                         {
2315                         skey = s->cert->pkeys[idx].privatekey;
2316                         if ((skey == NULL) ||
2317                                 (skey->type != EVP_PKEY_DH) ||
2318                                 (skey->pkey.dh == NULL))
2319                                 {
2320                                 al=SSL_AD_HANDSHAKE_FAILURE;
2321                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2322                                 goto f_err;
2323                                 }
2324                         dh_srvr = skey->pkey.dh;
2325                         }
2326                 else if (s->s3->tmp.dh == NULL)
2327                         {
2328                         al=SSL_AD_HANDSHAKE_FAILURE;
2329                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2330                         goto f_err;
2331                         }
2332                 else
2333                         dh_srvr=s->s3->tmp.dh;
2334
2335                 if (n == 0L)
2336                         {
2337                         /* Get pubkey from cert */
2338                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2339                         if (clkey)
2340                                 {
2341                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2342                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2343                                 }
2344                         if (dh_clnt == NULL)
2345                                 {
2346                                 al=SSL_AD_HANDSHAKE_FAILURE;
2347                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2348                                 goto f_err;
2349                                 }
2350                         EVP_PKEY_free(clkey);
2351                         pub = dh_clnt->pub_key;
2352                         }
2353                 else
2354                         pub=BN_bin2bn(p,i,NULL);
2355                 if (pub == NULL)
2356                         {
2357                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2358                         goto err;
2359                         }
2360
2361                 i=DH_compute_key(p,pub,dh_srvr);
2362
2363                 if (i <= 0)
2364                         {
2365                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2366                         BN_clear_free(pub);
2367                         goto err;
2368                         }
2369
2370                 DH_free(s->s3->tmp.dh);
2371                 s->s3->tmp.dh=NULL;
2372                 if (dh_clnt)
2373                         DH_free(dh_clnt);
2374                 else
2375                         BN_clear_free(pub);
2376                 pub=NULL;
2377                 s->session->master_key_length=
2378                         s->method->ssl3_enc->generate_master_secret(s,
2379                                 s->session->master_key,p,i);
2380                 OPENSSL_cleanse(p,i);
2381                 if (dh_clnt)
2382                         return 2;
2383                 }
2384         else
2385 #endif
2386 #ifndef OPENSSL_NO_KRB5
2387         if (alg_k & SSL_kKRB5)
2388                 {
2389                 krb5_error_code         krb5rc;
2390                 krb5_data               enc_ticket;
2391                 krb5_data               authenticator;
2392                 krb5_data               enc_pms;
2393                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2394                 EVP_CIPHER_CTX          ciph_ctx;
2395                 const EVP_CIPHER        *enc = NULL;
2396                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2397                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2398                                                + EVP_MAX_BLOCK_LENGTH];
2399                 int                  padl, outl;
2400                 krb5_timestamp          authtime = 0;
2401                 krb5_ticket_times       ttimes;
2402
2403                 EVP_CIPHER_CTX_init(&ciph_ctx);
2404
2405                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2406
2407                 n2s(p,i);
2408                 enc_ticket.length = i;
2409
2410                 if (n < (long)(enc_ticket.length + 6))
2411                         {
2412                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2413                                 SSL_R_DATA_LENGTH_TOO_LONG);
2414                         goto err;
2415                         }
2416
2417                 enc_ticket.data = (char *)p;
2418                 p+=enc_ticket.length;
2419
2420                 n2s(p,i);
2421                 authenticator.length = i;
2422
2423                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2424                         {
2425                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2426                                 SSL_R_DATA_LENGTH_TOO_LONG);
2427                         goto err;
2428                         }
2429
2430                 authenticator.data = (char *)p;
2431                 p+=authenticator.length;
2432
2433                 n2s(p,i);
2434                 enc_pms.length = i;
2435                 enc_pms.data = (char *)p;
2436                 p+=enc_pms.length;
2437
2438                 /* Note that the length is checked again below,
2439                 ** after decryption
2440                 */
2441                 if(enc_pms.length > sizeof pms)
2442                         {
2443                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2444                                SSL_R_DATA_LENGTH_TOO_LONG);
2445                         goto err;
2446                         }
2447
2448                 if (n != (long)(enc_ticket.length + authenticator.length +
2449                                                 enc_pms.length + 6))
2450                         {
2451                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2452                                 SSL_R_DATA_LENGTH_TOO_LONG);
2453                         goto err;
2454                         }
2455
2456                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2457                                         &kssl_err)) != 0)
2458                         {
2459 #ifdef KSSL_DEBUG
2460                         printf("kssl_sget_tkt rtn %d [%d]\n",
2461                                 krb5rc, kssl_err.reason);
2462                         if (kssl_err.text)
2463                                 printf("kssl_err text= %s\n", kssl_err.text);
2464 #endif  /* KSSL_DEBUG */
2465                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2466                                 kssl_err.reason);
2467                         goto err;
2468                         }
2469
2470                 /*  Note: no authenticator is not considered an error,
2471                 **  but will return authtime == 0.
2472                 */
2473                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2474                                         &authtime, &kssl_err)) != 0)
2475                         {
2476 #ifdef KSSL_DEBUG
2477                         printf("kssl_check_authent rtn %d [%d]\n",
2478                                 krb5rc, kssl_err.reason);
2479                         if (kssl_err.text)
2480                                 printf("kssl_err text= %s\n", kssl_err.text);
2481 #endif  /* KSSL_DEBUG */
2482                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2483                                 kssl_err.reason);
2484                         goto err;
2485                         }
2486
2487                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2488                         {
2489                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2490                         goto err;
2491                         }
2492
2493 #ifdef KSSL_DEBUG
2494                 kssl_ctx_show(kssl_ctx);
2495 #endif  /* KSSL_DEBUG */
2496
2497                 enc = kssl_map_enc(kssl_ctx->enctype);
2498                 if (enc == NULL)
2499                     goto err;
2500
2501                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2502
2503                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2504                         {
2505                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2506                                 SSL_R_DECRYPTION_FAILED);
2507                         goto err;
2508                         }
2509                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2510                                         (unsigned char *)enc_pms.data, enc_pms.length))
2511                         {
2512                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2513                                 SSL_R_DECRYPTION_FAILED);
2514                         goto err;
2515                         }
2516                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2517                         {
2518                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2519                                 SSL_R_DATA_LENGTH_TOO_LONG);
2520                         goto err;
2521                         }
2522                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2523                         {
2524                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2525                                 SSL_R_DECRYPTION_FAILED);
2526                         goto err;
2527                         }
2528                 outl += padl;
2529                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2530                         {
2531                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2532                                 SSL_R_DATA_LENGTH_TOO_LONG);
2533                         goto err;
2534                         }
2535                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2536                     {
2537                     /* The premaster secret must contain the same version number as the
2538                      * ClientHello to detect version rollback attacks (strangely, the
2539                      * protocol does not offer such protection for DH ciphersuites).
2540                      * However, buggy clients exist that send random bytes instead of
2541                      * the protocol version.
2542                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2543                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2544                      */
2545                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2546                         {
2547                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2548                                SSL_AD_DECODE_ERROR);
2549                         goto err;
2550                         }
2551                     }
2552
2553                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2554
2555                 s->session->master_key_length=
2556                         s->method->ssl3_enc->generate_master_secret(s,
2557                                 s->session->master_key, pms, outl);
2558
2559                 if (kssl_ctx->client_princ)
2560                         {
2561                         size_t len = strlen(kssl_ctx->client_princ);
2562                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2563                                 {
2564                                 s->session->krb5_client_princ_len = len;
2565                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2566                                 }
2567                         }
2568
2569
2570                 /*  Was doing kssl_ctx_free() here,
2571                 **  but it caused problems for apache.
2572                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2573                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2574                 */
2575                 }
2576         else
2577 #endif  /* OPENSSL_NO_KRB5 */
2578
2579 #ifndef OPENSSL_NO_ECDH
2580                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2581                 {
2582                 int ret = 1;
2583                 int field_size = 0;
2584                 const EC_KEY   *tkey;
2585                 const EC_GROUP *group;
2586                 const BIGNUM *priv_key;
2587
2588                 /* initialize structures for server's ECDH key pair */
2589                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2590                         {
2591                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2592                             ERR_R_MALLOC_FAILURE);
2593                         goto err;
2594                         }
2595
2596                 /* Let's get server private key and group information */
2597                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2598                         { 
2599                         /* use the certificate */
2600                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2601                         }
2602                 else
2603                         {
2604                         /* use the ephermeral values we saved when
2605                          * generating the ServerKeyExchange msg.
2606                          */
2607                         tkey = s->s3->tmp.ecdh;
2608                         }
2609
2610                 group    = EC_KEY_get0_group(tkey);
2611                 priv_key = EC_KEY_get0_private_key(tkey);
2612
2613                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2614                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2615                         {
2616                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2617                                ERR_R_EC_LIB);
2618                         goto err;
2619                         }
2620
2621                 /* Let's get client's public key */
2622                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2623                         {
2624                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2625                             ERR_R_MALLOC_FAILURE);
2626                         goto err;
2627                         }
2628
2629                 if (n == 0L) 
2630                         {
2631                         /* Client Publickey was in Client Certificate */
2632
2633                          if (alg_k & SSL_kEECDH)
2634                                  {
2635                                  al=SSL_AD_HANDSHAKE_FAILURE;
2636                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2637                                  goto f_err;
2638                                  }
2639                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2640                             == NULL) || 
2641                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2642                                 {
2643                                 /* XXX: For now, we do not support client
2644                                  * authentication using ECDH certificates
2645                                  * so this branch (n == 0L) of the code is
2646                                  * never executed. When that support is
2647                                  * added, we ought to ensure the key 
2648                                  * received in the certificate is 
2649                                  * authorized for key agreement.
2650                                  * ECDH_compute_key implicitly checks that
2651                                  * the two ECDH shares are for the same
2652                                  * group.
2653                                  */
2654                                 al=SSL_AD_HANDSHAKE_FAILURE;
2655                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2656                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2657                                 goto f_err;
2658                                 }
2659
2660                         if (EC_POINT_copy(clnt_ecpoint,
2661                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2662                                 {
2663                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2664                                         ERR_R_EC_LIB);
2665                                 goto err;
2666                                 }
2667                         ret = 2; /* Skip certificate verify processing */
2668                         }
2669                 else
2670                         {
2671                         /* Get client's public key from encoded point
2672                          * in the ClientKeyExchange message.
2673                          */
2674                         if ((bn_ctx = BN_CTX_new()) == NULL)
2675                                 {
2676                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2677                                     ERR_R_MALLOC_FAILURE);
2678                                 goto err;
2679                                 }
2680
2681                         /* Get encoded point length */
2682                         i = *p; 
2683                         p += 1;
2684                         if (n != 1 + i)
2685                                 {
2686                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2687                                     ERR_R_EC_LIB);
2688                                 goto err;
2689                                 }
2690                         if (EC_POINT_oct2point(group, 
2691                             clnt_ecpoint, p, i, bn_ctx) == 0)
2692                                 {
2693                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2694                                     ERR_R_EC_LIB);
2695                                 goto err;
2696                                 }
2697                         /* p is pointing to somewhere in the buffer
2698                          * currently, so set it to the start 
2699                          */ 
2700                         p=(unsigned char *)s->init_buf->data;
2701                         }
2702
2703                 /* Compute the shared pre-master secret */
2704                 field_size = EC_GROUP_get_degree(group);
2705                 if (field_size <= 0)
2706                         {
2707                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2708                                ERR_R_ECDH_LIB);
2709                         goto err;
2710                         }
2711                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2712                 if (i <= 0)
2713                         {
2714                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2715                             ERR_R_ECDH_LIB);
2716                         goto err;
2717                         }
2718
2719                 EVP_PKEY_free(clnt_pub_pkey);
2720                 EC_POINT_free(clnt_ecpoint);
2721                 EC_KEY_free(srvr_ecdh);
2722                 BN_CTX_free(bn_ctx);
2723                 EC_KEY_free(s->s3->tmp.ecdh);
2724                 s->s3->tmp.ecdh = NULL; 
2725
2726                 /* Compute the master secret */
2727                 s->session->master_key_length = s->method->ssl3_enc-> \
2728                     generate_master_secret(s, s->session->master_key, p, i);
2729                 
2730                 OPENSSL_cleanse(p, i);
2731                 return (ret);
2732                 }
2733         else
2734 #endif
2735 #ifndef OPENSSL_NO_PSK
2736                 if (alg_k & SSL_kPSK)
2737                         {
2738                         unsigned char *t = NULL;
2739                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2740                         unsigned int pre_ms_len = 0, psk_len = 0;
2741                         int psk_err = 1;
2742                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2743
2744                         al=SSL_AD_HANDSHAKE_FAILURE;
2745
2746                         n2s(p,i);
2747                         if (n != i+2)
2748                                 {
2749                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2750                                         SSL_R_LENGTH_MISMATCH);
2751                                 goto psk_err;
2752                                 }
2753                         if (i > PSK_MAX_IDENTITY_LEN)
2754                                 {
2755                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2756                                         SSL_R_DATA_LENGTH_TOO_LONG);
2757                                 goto psk_err;
2758                                 }
2759                         if (s->psk_server_callback == NULL)
2760                                 {
2761                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2762                                        SSL_R_PSK_NO_SERVER_CB);
2763                                 goto psk_err;
2764                                 }
2765
2766                         /* Create guaranteed NULL-terminated identity
2767                          * string for the callback */
2768                         memcpy(tmp_id, p, i);
2769                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2770                         psk_len = s->psk_server_callback(s, tmp_id,
2771                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2772                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2773
2774                         if (psk_len > PSK_MAX_PSK_LEN)
2775                                 {
2776                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2777                                         ERR_R_INTERNAL_ERROR);
2778                                 goto psk_err;
2779                                 }
2780                         else if (psk_len == 0)
2781                                 {
2782                                 /* PSK related to the given identity not found */
2783                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2784                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2785                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2786                                 goto psk_err;
2787                                 }
2788
2789                         /* create PSK pre_master_secret */
2790                         pre_ms_len=2+psk_len+2+psk_len;
2791                         t = psk_or_pre_ms;
2792                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2793                         s2n(psk_len, t);
2794                         memset(t, 0, psk_len);
2795                         t+=psk_len;
2796                         s2n(psk_len, t);
2797
2798                         if (s->session->psk_identity != NULL)
2799                                 OPENSSL_free(s->session->psk_identity);
2800                         s->session->psk_identity = BUF_strdup((char *)p);
2801                         if (s->session->psk_identity == NULL)
2802                                 {
2803                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2804                                         ERR_R_MALLOC_FAILURE);
2805                                 goto psk_err;
2806                                 }
2807
2808                         if (s->session->psk_identity_hint != NULL)
2809                                 OPENSSL_free(s->session->psk_identity_hint);
2810                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2811                         if (s->ctx->psk_identity_hint != NULL &&
2812                                 s->session->psk_identity_hint == NULL)
2813                                 {
2814                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2815                                         ERR_R_MALLOC_FAILURE);
2816                                 goto psk_err;
2817                                 }
2818
2819                         s->session->master_key_length=
2820                                 s->method->ssl3_enc->generate_master_secret(s,
2821                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2822                         psk_err = 0;
2823                 psk_err:
2824                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2825                         if (psk_err != 0)
2826                                 goto f_err;
2827                         }
2828                 else
2829 #endif
2830 #ifndef OPENSSL_NO_SRP
2831                 if (alg_k & SSL_kSRP)
2832                         {
2833                         int param_len;
2834
2835                         n2s(p,i);
2836                         param_len=i+2;
2837                         if (param_len > n)
2838                                 {
2839                                 al=SSL_AD_DECODE_ERROR;
2840                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2841                                 goto f_err;
2842                                 }
2843                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2844                                 {
2845                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2846                                 goto err;
2847                                 }
2848                         if (s->session->srp_username != NULL)
2849                                 OPENSSL_free(s->session->srp_username);
2850                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2851                         if (s->session->srp_username == NULL)
2852                                 {
2853                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2854                                         ERR_R_MALLOC_FAILURE);
2855                                 goto err;
2856                                 }
2857
2858                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2859                                 {
2860                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2861                                 goto err;
2862                                 }
2863
2864                         p+=i;
2865                         }
2866                 else
2867 #endif  /* OPENSSL_NO_SRP */
2868                 if (alg_k & SSL_kGOST) 
2869                         {
2870                         int ret = 0;
2871                         EVP_PKEY_CTX *pkey_ctx;
2872                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2873                         unsigned char premaster_secret[32], *start;
2874                         size_t outlen=32, inlen;
2875                         unsigned long alg_a;
2876
2877                         /* Get our certificate private key*/
2878                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2879                         if (alg_a & SSL_aGOST94)
2880                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2881                         else if (alg_a & SSL_aGOST01)
2882                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2883
2884                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2885                         EVP_PKEY_decrypt_init(pkey_ctx);
2886                         /* If client certificate is present and is of the same type, maybe
2887                          * use it for key exchange.  Don't mind errors from
2888                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2889                          * a client certificate for authorization only. */
2890                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2891                         if (client_pub_pkey)
2892                                 {
2893                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2894                                         ERR_clear_error();
2895                                 }
2896                         /* Decrypt session key */
2897                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2898                                 {
2899                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2900                                 goto gerr;
2901                                 }
2902                         if (p[1] == 0x81)
2903                                 {
2904                                 start = p+3;
2905                                 inlen = p[2];
2906                                 }
2907                         else if (p[1] < 0x80)
2908                                 {
2909                                 start = p+2;
2910                                 inlen = p[1];
2911                                 }
2912                         else
2913                                 {
2914                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2915                                 goto gerr;
2916                                 }
2917                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2918
2919                                 {
2920                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2921                                 goto gerr;
2922                                 }
2923                         /* Generate master secret */
2924                         s->session->master_key_length=
2925                                 s->method->ssl3_enc->generate_master_secret(s,
2926                                         s->session->master_key,premaster_secret,32);
2927                         /* Check if pubkey from client certificate was used */
2928                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2929                                 ret = 2;
2930                         else
2931                                 ret = 1;
2932                 gerr:
2933                         EVP_PKEY_free(client_pub_pkey);
2934                         EVP_PKEY_CTX_free(pkey_ctx);
2935                         if (ret)
2936                                 return ret;
2937                         else
2938                                 goto err;
2939                         }
2940                 else
2941                 {
2942                 al=SSL_AD_HANDSHAKE_FAILURE;
2943                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2944                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2945                 goto f_err;
2946                 }
2947
2948         return(1);
2949 f_err:
2950         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2951 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2952 err:
2953 #endif
2954 #ifndef OPENSSL_NO_ECDH
2955         EVP_PKEY_free(clnt_pub_pkey);
2956         EC_POINT_free(clnt_ecpoint);
2957         if (srvr_ecdh != NULL) 
2958                 EC_KEY_free(srvr_ecdh);
2959         BN_CTX_free(bn_ctx);
2960 #endif
2961         return(-1);
2962         }
2963
2964 int ssl3_get_cert_verify(SSL *s)
2965         {
2966         EVP_PKEY *pkey=NULL;
2967         unsigned char *p;
2968         int al,ok,ret=0;
2969         long n;
2970         int type=0,i,j;
2971         X509 *peer;
2972         const EVP_MD *md = NULL;
2973         EVP_MD_CTX mctx;
2974         EVP_MD_CTX_init(&mctx);
2975
2976         n=s->method->ssl_get_message(s,
2977                 SSL3_ST_SR_CERT_VRFY_A,
2978                 SSL3_ST_SR_CERT_VRFY_B,
2979                 -1,
2980                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
2981                 &ok);
2982
2983         if (!ok) return((int)n);
2984
2985         if (s->session->peer != NULL)
2986                 {
2987                 peer=s->session->peer;
2988                 pkey=X509_get_pubkey(peer);
2989                 type=X509_certificate_type(peer,pkey);
2990                 }
2991         else
2992                 {
2993                 peer=NULL;
2994                 pkey=NULL;
2995                 }
2996
2997         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2998                 {
2999                 s->s3->tmp.reuse_message=1;
3000                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3001                         {
3002                         al=SSL_AD_UNEXPECTED_MESSAGE;
3003                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3004                         goto f_err;
3005                         }
3006                 ret=1;
3007                 goto end;
3008                 }
3009
3010         if (peer == NULL)
3011                 {
3012                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3013                 al=SSL_AD_UNEXPECTED_MESSAGE;
3014                 goto f_err;
3015                 }
3016
3017         if (!(type & EVP_PKT_SIGN))
3018                 {
3019                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3020                 al=SSL_AD_ILLEGAL_PARAMETER;
3021                 goto f_err;
3022                 }
3023
3024         if (s->s3->change_cipher_spec)
3025                 {
3026                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3027                 al=SSL_AD_UNEXPECTED_MESSAGE;
3028                 goto f_err;
3029                 }
3030
3031         /* we now have a signature that we need to verify */
3032         p=(unsigned char *)s->init_msg;
3033         /* Check for broken implementations of GOST ciphersuites */
3034         /* If key is GOST and n is exactly 64, it is bare
3035          * signature without length field */
3036         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3037                 pkey->type == NID_id_GostR3410_2001) )
3038                 {
3039                 i=64;
3040                 } 
3041         else 
3042                 {       
3043                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3044                         {
3045                         int sigalg = tls12_get_sigid(pkey);
3046                         /* Should never happen */
3047                         if (sigalg == -1)
3048                                 {
3049                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3050                                 al=SSL_AD_INTERNAL_ERROR;
3051                                 goto f_err;
3052                                 }
3053                         /* Check key type is consistent with signature */
3054                         if (sigalg != (int)p[1])
3055                                 {
3056                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3057                                 al=SSL_AD_DECODE_ERROR;
3058                                 goto f_err;
3059                                 }
3060                         md = tls12_get_hash(p[0]);
3061                         if (md == NULL)
3062                                 {
3063                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3064                                 al=SSL_AD_DECODE_ERROR;
3065                                 goto f_err;
3066                                 }
3067 #ifdef SSL_DEBUG
3068 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3069 #endif
3070                         p += 2;
3071                         n -= 2;
3072                         }
3073                 n2s(p,i);
3074                 n-=2;
3075                 if (i > n)
3076                         {
3077                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3078                         al=SSL_AD_DECODE_ERROR;
3079                         goto f_err;
3080                         }
3081         }
3082         j=EVP_PKEY_size(pkey);
3083         if ((i > j) || (n > j) || (n <= 0))
3084                 {
3085                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3086                 al=SSL_AD_DECODE_ERROR;
3087                 goto f_err;
3088                 }
3089
3090         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3091                 {
3092                 long hdatalen = 0;
3093                 void *hdata;
3094                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3095                 if (hdatalen <= 0)
3096                         {
3097                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3098                         al=SSL_AD_INTERNAL_ERROR;
3099                         goto f_err;
3100                         }
3101 #ifdef SSL_DEBUG
3102                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3103                                                         EVP_MD_name(md));
3104 #endif
3105                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3106                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3107                         {
3108                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3109                         al=SSL_AD_INTERNAL_ERROR;
3110                         goto f_err;
3111                         }
3112
3113                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3114                         {
3115                         al=SSL_AD_DECRYPT_ERROR;
3116                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3117                         goto f_err;
3118                         }
3119                 }
3120         else
3121 #ifndef OPENSSL_NO_RSA 
3122         if (pkey->type == EVP_PKEY_RSA)
3123                 {
3124                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3125                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
3126                                                         pkey->pkey.rsa);
3127                 if (i < 0)
3128                         {
3129                         al=SSL_AD_DECRYPT_ERROR;
3130                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3131                         goto f_err;
3132                         }
3133                 if (i == 0)
3134                         {
3135                         al=SSL_AD_DECRYPT_ERROR;
3136                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3137                         goto f_err;
3138                         }
3139                 }
3140         else
3141 #endif
3142 #ifndef OPENSSL_NO_DSA
3143                 if (pkey->type == EVP_PKEY_DSA)
3144                 {
3145                 j=DSA_verify(pkey->save_type,
3146                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3147                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3148                 if (j <= 0)
3149                         {
3150                         /* bad signature */
3151                         al=SSL_AD_DECRYPT_ERROR;
3152                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3153                         goto f_err;
3154                         }
3155                 }
3156         else
3157 #endif
3158 #ifndef OPENSSL_NO_ECDSA
3159                 if (pkey->type == EVP_PKEY_EC)
3160                 {
3161                 j=ECDSA_verify(pkey->save_type,
3162                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3163                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3164                 if (j <= 0)
3165                         {
3166                         /* bad signature */
3167                         al=SSL_AD_DECRYPT_ERROR;
3168                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3169                             SSL_R_BAD_ECDSA_SIGNATURE);
3170                         goto f_err;
3171                         }
3172                 }
3173         else
3174 #endif
3175         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3176                 {   unsigned char signature[64];
3177                         int idx;
3178                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3179                         EVP_PKEY_verify_init(pctx);
3180                         if (i!=64) {
3181                                 fprintf(stderr,"GOST signature length is %d",i);
3182                         }       
3183                         for (idx=0;idx<64;idx++) {
3184                                 signature[63-idx]=p[idx];
3185                         }       
3186                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3187                         EVP_PKEY_CTX_free(pctx);
3188                         if (j<=0) 
3189                                 {
3190                                 al=SSL_AD_DECRYPT_ERROR;
3191                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3192                                         SSL_R_BAD_ECDSA_SIGNATURE);
3193                                 goto f_err;
3194                                 }       
3195                 }
3196         else    
3197                 {
3198                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3199                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3200                 goto f_err;
3201                 }
3202
3203
3204         ret=1;
3205         if (0)
3206                 {
3207 f_err:
3208                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3209                 }
3210 end:
3211         if (s->s3->handshake_buffer)
3212                 {
3213                 BIO_free(s->s3->handshake_buffer);
3214                 s->s3->handshake_buffer = NULL;
3215                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3216                 }
3217         EVP_MD_CTX_cleanup(&mctx);
3218         EVP_PKEY_free(pkey);
3219         return(ret);
3220         }
3221
3222 int ssl3_get_client_certificate(SSL *s)
3223         {
3224         int i,ok,al,ret= -1;
3225         X509 *x=NULL;
3226         unsigned long l,nc,llen,n;
3227         const unsigned char *p,*q;
3228         unsigned char *d;
3229         STACK_OF(X509) *sk=NULL;
3230
3231         n=s->method->ssl_get_message(s,
3232                 SSL3_ST_SR_CERT_A,
3233                 SSL3_ST_SR_CERT_B,
3234                 -1,
3235                 s->max_cert_list,
3236                 &ok);
3237
3238         if (!ok) return((int)n);
3239
3240         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3241                 {
3242                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3243                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3244                         {
3245                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3246                         al=SSL_AD_HANDSHAKE_FAILURE;
3247                         goto f_err;
3248                         }
3249                 /* If tls asked for a client cert, the client must return a 0 list */
3250                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3251                         {
3252                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3253                         al=SSL_AD_UNEXPECTED_MESSAGE;
3254                         goto f_err;
3255                         }
3256                 s->s3->tmp.reuse_message=1;
3257                 return(1);
3258                 }
3259
3260         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3261                 {
3262                 al=SSL_AD_UNEXPECTED_MESSAGE;
3263                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3264                 goto f_err;
3265                 }
3266         p=d=(unsigned char *)s->init_msg;
3267
3268         if ((sk=sk_X509_new_null()) == NULL)
3269                 {
3270                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3271                 goto err;
3272                 }
3273
3274         n2l3(p,llen);
3275         if (llen+3 != n)
3276                 {
3277                 al=SSL_AD_DECODE_ERROR;
3278                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3279                 goto f_err;
3280                 }
3281         for (nc=0; nc<llen; )
3282                 {
3283                 n2l3(p,l);
3284                 if ((l+nc+3) > llen)
3285                         {
3286                         al=SSL_AD_DECODE_ERROR;
3287                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3288                         goto f_err;
3289                         }
3290
3291                 q=p;
3292                 x=d2i_X509(NULL,&p,l);
3293                 if (x == NULL)
3294                         {
3295                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3296                         goto err;
3297                         }
3298                 if (p != (q+l))
3299                         {
3300                         al=SSL_AD_DECODE_ERROR;
3301                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3302                         goto f_err;
3303                         }
3304                 if (!sk_X509_push(sk,x))
3305                         {
3306                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3307                         goto err;
3308                         }
3309                 x=NULL;
3310                 nc+=l+3;
3311                 }
3312
3313         if (sk_X509_num(sk) <= 0)
3314                 {
3315                 /* TLS does not mind 0 certs returned */
3316                 if (s->version == SSL3_VERSION)
3317                         {
3318                         al=SSL_AD_HANDSHAKE_FAILURE;
3319                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3320                         goto f_err;
3321                         }
3322                 /* Fail for TLS only if we required a certificate */
3323                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3324                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3325                         {
3326                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3327                         al=SSL_AD_HANDSHAKE_FAILURE;
3328                         goto f_err;
3329                         }
3330                 /* No client certificate so digest cached records */
3331                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3332                         {
3333                         al=SSL_AD_INTERNAL_ERROR;
3334                         goto f_err;
3335                         }
3336                 }
3337         else
3338                 {
3339                 i=ssl_verify_cert_chain(s,sk);
3340                 if (i <= 0)
3341                         {
3342                         al=ssl_verify_alarm_type(s->verify_result);
3343                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3344                         goto f_err;
3345                         }
3346                 }
3347
3348         if (s->session->peer != NULL) /* This should not be needed */
3349                 X509_free(s->session->peer);
3350         s->session->peer=sk_X509_shift(sk);
3351         s->session->verify_result = s->verify_result;
3352
3353         /* With the current implementation, sess_cert will always be NULL
3354          * when we arrive here. */
3355         if (s->session->sess_cert == NULL)
3356                 {
3357                 s->session->sess_cert = ssl_sess_cert_new();
3358                 if (s->session->sess_cert == NULL)
3359                         {
3360                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3361      &nb