Remove all RFC5878 code.
[openssl.git] / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include "ssl_locl.h"
156 #include "kssl_lcl.h"
157 #include <openssl/buffer.h>
158 #include <openssl/rand.h>
159 #include <openssl/objects.h>
160 #include <openssl/evp.h>
161 #include <openssl/hmac.h>
162 #include <openssl/x509.h>
163 #ifndef OPENSSL_NO_DH
164 #include <openssl/dh.h>
165 #endif
166 #include <openssl/bn.h>
167 #ifndef OPENSSL_NO_KRB5
168 #include <openssl/krb5_asn.h>
169 #endif
170 #include <openssl/md5.h>
171
172 static const SSL_METHOD *ssl3_get_server_method(int ver);
173
174 static const SSL_METHOD *ssl3_get_server_method(int ver)
175         {
176         if (ver == SSL3_VERSION)
177                 return(SSLv3_server_method());
178         else
179                 return(NULL);
180         }
181
182 #ifndef OPENSSL_NO_SRP
183 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
184         {
185         int ret = SSL_ERROR_NONE;
186
187         *al = SSL_AD_UNRECOGNIZED_NAME;
188
189         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
190             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
191                 {
192                 if(s->srp_ctx.login == NULL)
193                         {
194                         /* RFC 5054 says SHOULD reject, 
195                            we do so if There is no srp login name */
196                         ret = SSL3_AL_FATAL;
197                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
198                         }
199                 else
200                         {
201                         ret = SSL_srp_server_param_with_username(s,al);
202                         }
203                 }
204         return ret;
205         }
206 #endif
207
208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
209                         ssl3_accept,
210                         ssl_undefined_function,
211                         ssl3_get_server_method)
212
213 int ssl3_accept(SSL *s)
214         {
215         BUF_MEM *buf;
216         unsigned long alg_k,Time=(unsigned long)time(NULL);
217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
218         int ret= -1;
219         int new_state,state,skip=0;
220
221         RAND_add(&Time,sizeof(Time),0);
222         ERR_clear_error();
223         clear_sys_error();
224
225         if (s->info_callback != NULL)
226                 cb=s->info_callback;
227         else if (s->ctx->info_callback != NULL)
228                 cb=s->ctx->info_callback;
229
230         /* init things to blank */
231         s->in_handshake++;
232         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
233
234         if (s->cert == NULL)
235                 {
236                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
237                 return(-1);
238                 }
239
240 #ifndef OPENSSL_NO_HEARTBEATS
241         /* If we're awaiting a HeartbeatResponse, pretend we
242          * already got and don't await it anymore, because
243          * Heartbeats don't make sense during handshakes anyway.
244          */
245         if (s->tlsext_hb_pending)
246                 {
247                 s->tlsext_hb_pending = 0;
248                 s->tlsext_hb_seq++;
249                 }
250 #endif
251
252         for (;;)
253                 {
254                 state=s->state;
255
256                 switch (s->state)
257                         {
258                 case SSL_ST_RENEGOTIATE:
259                         s->renegotiate=1;
260                         /* s->state=SSL_ST_ACCEPT; */
261
262                 case SSL_ST_BEFORE:
263                 case SSL_ST_ACCEPT:
264                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
265                 case SSL_ST_OK|SSL_ST_ACCEPT:
266
267                         s->server=1;
268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
269
270                         if ((s->version>>8) != 3)
271                                 {
272                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
273                                 return -1;
274                                 }
275
276                         if (!ssl_security(s, SSL_SECOP_VERSION, 0,
277                                                         s->version, NULL))
278                                 {
279                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_VERSION_TOO_LOW);
280                                 return -1;
281                                 }
282
283                         s->type=SSL_ST_ACCEPT;
284
285                         if (s->init_buf == NULL)
286                                 {
287                                 if ((buf=BUF_MEM_new()) == NULL)
288                                         {
289                                         ret= -1;
290                                         goto end;
291                                         }
292                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
293                                         {
294                                         ret= -1;
295                                         goto end;
296                                         }
297                                 s->init_buf=buf;
298                                 }
299
300                         if (!ssl3_setup_buffers(s))
301                                 {
302                                 ret= -1;
303                                 goto end;
304                                 }
305
306                         s->init_num=0;
307                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
308                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
309
310                         if (s->state != SSL_ST_RENEGOTIATE)
311                                 {
312                                 /* Ok, we now need to push on a buffering BIO so that
313                                  * the output is sent in a way that TCP likes :-)
314                                  */
315                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
316                                 
317                                 ssl3_init_finished_mac(s);
318                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
319                                 s->ctx->stats.sess_accept++;
320                                 }
321                         else if (!s->s3->send_connection_binding &&
322                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
323                                 {
324                                 /* Server attempting to renegotiate with
325                                  * client that doesn't support secure
326                                  * renegotiation.
327                                  */
328                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
329                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
330                                 ret = -1;
331                                 goto end;
332                                 }
333                         else
334                                 {
335                                 /* s->state == SSL_ST_RENEGOTIATE,
336                                  * we will just send a HelloRequest */
337                                 s->ctx->stats.sess_accept_renegotiate++;
338                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
339                                 }
340                         break;
341
342                 case SSL3_ST_SW_HELLO_REQ_A:
343                 case SSL3_ST_SW_HELLO_REQ_B:
344
345                         s->shutdown=0;
346                         ret=ssl3_send_hello_request(s);
347                         if (ret <= 0) goto end;
348                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
349                         s->state=SSL3_ST_SW_FLUSH;
350                         s->init_num=0;
351
352                         ssl3_init_finished_mac(s);
353                         break;
354
355                 case SSL3_ST_SW_HELLO_REQ_C:
356                         s->state=SSL_ST_OK;
357                         break;
358
359                 case SSL3_ST_SR_CLNT_HELLO_A:
360                 case SSL3_ST_SR_CLNT_HELLO_B:
361                 case SSL3_ST_SR_CLNT_HELLO_C:
362
363                         ret=ssl3_get_client_hello(s);
364                         if (ret <= 0) goto end;
365 #ifndef OPENSSL_NO_SRP
366                         s->state = SSL3_ST_SR_CLNT_HELLO_D;
367                 case SSL3_ST_SR_CLNT_HELLO_D:
368                         {
369                         int al;
370                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
371                                         {
372                                         /* callback indicates firther work to be done */
373                                         s->rwstate=SSL_X509_LOOKUP;
374                                         goto end;
375                                         }
376                         if (ret != SSL_ERROR_NONE)
377                                 {
378                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);    
379                                 /* This is not really an error but the only means to
380                                    for a client to detect whether srp is supported. */
381                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)      
382                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);                     
383                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;                       
384                                 ret= -1;
385                                 goto end;       
386                                 }
387                         }
388 #endif          
389                         
390                         s->renegotiate = 2;
391                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
392                         s->init_num=0;
393                         break;
394
395                 case SSL3_ST_SW_SRVR_HELLO_A:
396                 case SSL3_ST_SW_SRVR_HELLO_B:
397                         ret=ssl3_send_server_hello(s);
398                         if (ret <= 0) goto end;
399 #ifndef OPENSSL_NO_TLSEXT
400                         if (s->hit)
401                                 {
402                                 if (s->tlsext_ticket_expected)
403                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
404                                 else
405                                         s->state=SSL3_ST_SW_CHANGE_A;
406                                 }
407 #else
408                         if (s->hit)
409                                         s->state=SSL3_ST_SW_CHANGE_A;
410 #endif
411                         else
412                                         s->state = SSL3_ST_SW_CERT_A;
413                         s->init_num = 0;
414                         break;
415
416                 case SSL3_ST_SW_CERT_A:
417                 case SSL3_ST_SW_CERT_B:
418                         /* Check if it is anon DH or anon ECDH, */
419                         /* normal PSK or KRB5 or SRP */
420                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
421                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
422                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
423                                 {
424                                 ret=ssl3_send_server_certificate(s);
425                                 if (ret <= 0) goto end;
426 #ifndef OPENSSL_NO_TLSEXT
427                                 if (s->tlsext_status_expected)
428                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
429                                 else
430                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
431                                 }
432                         else
433                                 {
434                                 skip = 1;
435                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
436                                 }
437 #else
438                                 }
439                         else
440                                 skip=1;
441
442                         s->state=SSL3_ST_SW_KEY_EXCH_A;
443 #endif
444                         s->init_num=0;
445                         break;
446
447                 case SSL3_ST_SW_KEY_EXCH_A:
448                 case SSL3_ST_SW_KEY_EXCH_B:
449                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
450
451                         /* clear this, it may get reset by
452                          * send_server_key_exchange */
453                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
454 #ifndef OPENSSL_NO_KRB5
455                                 && !(alg_k & SSL_kKRB5)
456 #endif /* OPENSSL_NO_KRB5 */
457                                 )
458                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
459                                  * even when forbidden by protocol specs
460                                  * (handshake may fail as clients are not required to
461                                  * be able to handle this) */
462                                 s->s3->tmp.use_rsa_tmp=1;
463                         else
464                                 s->s3->tmp.use_rsa_tmp=0;
465
466
467                         /* only send if a DH key exchange, fortezza or
468                          * RSA but we have a sign only certificate
469                          *
470                          * PSK: may send PSK identity hints
471                          *
472                          * For ECC ciphersuites, we send a serverKeyExchange
473                          * message only if the cipher suite is either
474                          * ECDH-anon or ECDHE. In other cases, the
475                          * server certificate contains the server's
476                          * public key for key exchange.
477                          */
478                         if (s->s3->tmp.use_rsa_tmp
479                         /* PSK: send ServerKeyExchange if PSK identity
480                          * hint if provided */
481 #ifndef OPENSSL_NO_PSK
482                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
483 #endif
484 #ifndef OPENSSL_NO_SRP
485                             /* SRP: send ServerKeyExchange */
486                             || (alg_k & SSL_kSRP)
487 #endif
488                             || (alg_k & SSL_kDHE)
489                             || (alg_k & SSL_kECDHE)
490                             || ((alg_k & SSL_kRSA)
491                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
492                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
493                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
494                                         )
495                                     )
496                                 )
497                             )
498                                 {
499                                 ret=ssl3_send_server_key_exchange(s);
500                                 if (ret <= 0) goto end;
501                                 }
502                         else
503                                 skip=1;
504
505                         s->state=SSL3_ST_SW_CERT_REQ_A;
506                         s->init_num=0;
507                         break;
508
509                 case SSL3_ST_SW_CERT_REQ_A:
510                 case SSL3_ST_SW_CERT_REQ_B:
511                         if (/* don't request cert unless asked for it: */
512                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
513                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
514                                  * don't request cert during re-negotiation: */
515                                 ((s->session->peer != NULL) &&
516                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
517                                 /* never request cert in anonymous ciphersuites
518                                  * (see section "Certificate request" in SSL 3 drafts
519                                  * and in RFC 2246): */
520                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
521                                  /* ... except when the application insists on verification
522                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
523                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
524                                  /* never request cert in Kerberos ciphersuites */
525                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
526                                 /* With normal PSK Certificates and
527                                  * Certificate Requests are omitted */
528                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
529                                 {
530                                 /* no cert request */
531                                 skip=1;
532                                 s->s3->tmp.cert_request=0;
533                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
534                                 if (s->s3->handshake_buffer)
535                                         if (!ssl3_digest_cached_records(s))
536                                                 return -1;
537                                 }
538                         else
539                                 {
540                                 s->s3->tmp.cert_request=1;
541                                 ret=ssl3_send_certificate_request(s);
542                                 if (ret <= 0) goto end;
543 #ifndef NETSCAPE_HANG_BUG
544                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
545 #else
546                                 s->state=SSL3_ST_SW_FLUSH;
547                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
548 #endif
549                                 s->init_num=0;
550                                 }
551                         break;
552
553                 case SSL3_ST_SW_SRVR_DONE_A:
554                 case SSL3_ST_SW_SRVR_DONE_B:
555                         ret=ssl3_send_server_done(s);
556                         if (ret <= 0) goto end;
557                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
558                         s->state=SSL3_ST_SW_FLUSH;
559                         s->init_num=0;
560                         break;
561                 
562                 case SSL3_ST_SW_FLUSH:
563
564                         /* This code originally checked to see if
565                          * any data was pending using BIO_CTRL_INFO
566                          * and then flushed. This caused problems
567                          * as documented in PR#1939. The proposed
568                          * fix doesn't completely resolve this issue
569                          * as buggy implementations of BIO_CTRL_PENDING
570                          * still exist. So instead we just flush
571                          * unconditionally.
572                          */
573
574                         s->rwstate=SSL_WRITING;
575                         if (BIO_flush(s->wbio) <= 0)
576                                 {
577                                 ret= -1;
578                                 goto end;
579                                 }
580                         s->rwstate=SSL_NOTHING;
581
582                         s->state=s->s3->tmp.next_state;
583                         break;
584
585                 case SSL3_ST_SR_CERT_A:
586                 case SSL3_ST_SR_CERT_B:
587                         /* Check for second client hello (MS SGC) */
588                         ret = ssl3_check_client_hello(s);
589                         if (ret <= 0)
590                                 goto end;
591                         if (ret == 2)
592                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
593                         else {
594                                 if (s->s3->tmp.cert_request)
595                                         {
596                                         ret=ssl3_get_client_certificate(s);
597                                         if (ret <= 0) goto end;
598                                         }
599                                 s->init_num=0;
600                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
601                         }
602                         break;
603
604                 case SSL3_ST_SR_KEY_EXCH_A:
605                 case SSL3_ST_SR_KEY_EXCH_B:
606                         ret=ssl3_get_client_key_exchange(s);
607                         if (ret <= 0)
608                                 goto end;
609                         if (ret == 2)
610                                 {
611                                 /* For the ECDH ciphersuites when
612                                  * the client sends its ECDH pub key in
613                                  * a certificate, the CertificateVerify
614                                  * message is not sent.
615                                  * Also for GOST ciphersuites when
616                                  * the client uses its key from the certificate
617                                  * for key exchange.
618                                  */
619 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
620                                 s->state=SSL3_ST_SR_FINISHED_A;
621 #else
622                                 if (s->s3->next_proto_neg_seen)
623                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
624                                 else
625                                         s->state=SSL3_ST_SR_FINISHED_A;
626 #endif
627                                 s->init_num = 0;
628                                 }
629                         else if (SSL_USE_SIGALGS(s))
630                                 {
631                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
632                                 s->init_num=0;
633                                 if (!s->session->peer)
634                                         break;
635                                 /* For sigalgs freeze the handshake buffer
636                                  * at this point and digest cached records.
637                                  */
638                                 if (!s->s3->handshake_buffer)
639                                         {
640                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
641                                         return -1;
642                                         }
643                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
644                                 if (!ssl3_digest_cached_records(s))
645                                         return -1;
646                                 }
647                         else
648                                 {
649                                 int offset=0;
650                                 int dgst_num;
651
652                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
653                                 s->init_num=0;
654
655                                 /* We need to get hashes here so if there is
656                                  * a client cert, it can be verified
657                                  * FIXME - digest processing for CertificateVerify
658                                  * should be generalized. But it is next step
659                                  */
660                                 if (s->s3->handshake_buffer)
661                                         if (!ssl3_digest_cached_records(s))
662                                                 return -1;
663                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
664                                         if (s->s3->handshake_dgst[dgst_num]) 
665                                                 {
666                                                 int dgst_size;
667
668                                                 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]));
669                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
670                                                 if (dgst_size < 0)
671                                                         {
672                                                         ret = -1;
673                                                         goto end;
674                                                         }
675                                                 offset+=dgst_size;
676                                                 }               
677                                 }
678                         break;
679
680                 case SSL3_ST_SR_CERT_VRFY_A:
681                 case SSL3_ST_SR_CERT_VRFY_B:
682
683                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
684                         /* we should decide if we expected this one */
685                         ret=ssl3_get_cert_verify(s);
686                         if (ret <= 0) goto end;
687
688 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
689                         s->state=SSL3_ST_SR_FINISHED_A;
690 #else
691                         if (s->s3->next_proto_neg_seen)
692                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
693                         else
694                                 s->state=SSL3_ST_SR_FINISHED_A;
695 #endif
696                         s->init_num=0;
697                         break;
698
699 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
700                 case SSL3_ST_SR_NEXT_PROTO_A:
701                 case SSL3_ST_SR_NEXT_PROTO_B:
702                         ret=ssl3_get_next_proto(s);
703                         if (ret <= 0) goto end;
704                         s->init_num = 0;
705                         s->state=SSL3_ST_SR_FINISHED_A;
706                         break;
707 #endif
708
709                 case SSL3_ST_SR_FINISHED_A:
710                 case SSL3_ST_SR_FINISHED_B:
711                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
712                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
713                                 SSL3_ST_SR_FINISHED_B);
714                         if (ret <= 0) goto end;
715                         if (s->hit)
716                                 s->state=SSL_ST_OK;
717 #ifndef OPENSSL_NO_TLSEXT
718                         else if (s->tlsext_ticket_expected)
719                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
720 #endif
721                         else
722                                 s->state=SSL3_ST_SW_CHANGE_A;
723                         s->init_num=0;
724                         break;
725
726 #ifndef OPENSSL_NO_TLSEXT
727                 case SSL3_ST_SW_SESSION_TICKET_A:
728                 case SSL3_ST_SW_SESSION_TICKET_B:
729                         ret=ssl3_send_newsession_ticket(s);
730                         if (ret <= 0) goto end;
731                         s->state=SSL3_ST_SW_CHANGE_A;
732                         s->init_num=0;
733                         break;
734
735                 case SSL3_ST_SW_CERT_STATUS_A:
736                 case SSL3_ST_SW_CERT_STATUS_B:
737                         ret=ssl3_send_cert_status(s);
738                         if (ret <= 0) goto end;
739                         s->state=SSL3_ST_SW_KEY_EXCH_A;
740                         s->init_num=0;
741                         break;
742
743 #endif
744
745                 case SSL3_ST_SW_CHANGE_A:
746                 case SSL3_ST_SW_CHANGE_B:
747
748                         s->session->cipher=s->s3->tmp.new_cipher;
749                         if (!s->method->ssl3_enc->setup_key_block(s))
750                                 { ret= -1; goto end; }
751
752                         ret=ssl3_send_change_cipher_spec(s,
753                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
754
755                         if (ret <= 0) goto end;
756                         s->state=SSL3_ST_SW_FINISHED_A;
757                         s->init_num=0;
758
759                         if (!s->method->ssl3_enc->change_cipher_state(s,
760                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
761                                 {
762                                 ret= -1;
763                                 goto end;
764                                 }
765
766                         break;
767
768                 case SSL3_ST_SW_FINISHED_A:
769                 case SSL3_ST_SW_FINISHED_B:
770                         ret=ssl3_send_finished(s,
771                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
772                                 s->method->ssl3_enc->server_finished_label,
773                                 s->method->ssl3_enc->server_finished_label_len);
774                         if (ret <= 0) goto end;
775                         s->state=SSL3_ST_SW_FLUSH;
776                         if (s->hit)
777                                 {
778 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
779                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
780 #else
781                                 if (s->s3->next_proto_neg_seen)
782                                         {
783                                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
784                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
785                                         }
786                                 else
787                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
788 #endif
789                                 }
790                         else
791                                 s->s3->tmp.next_state=SSL_ST_OK;
792                         s->init_num=0;
793                         break;
794
795                 case SSL_ST_OK:
796                         /* clean a few things up */
797                         ssl3_cleanup_key_block(s);
798
799                         BUF_MEM_free(s->init_buf);
800                         s->init_buf=NULL;
801
802                         /* remove buffering on output */
803                         ssl_free_wbio_buffer(s);
804
805                         s->init_num=0;
806
807                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
808                                 {
809                                 s->renegotiate=0;
810                                 s->new_session=0;
811                                 
812                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
813                                 
814                                 s->ctx->stats.sess_accept_good++;
815                                 /* s->server=1; */
816                                 s->handshake_func=ssl3_accept;
817
818                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
819                                 }
820                         
821                         ret = 1;
822                         goto end;
823                         /* break; */
824
825                 default:
826                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
827                         ret= -1;
828                         goto end;
829                         /* break; */
830                         }
831                 
832                 if (!s->s3->tmp.reuse_message && !skip)
833                         {
834                         if (s->debug)
835                                 {
836                                 if ((ret=BIO_flush(s->wbio)) <= 0)
837                                         goto end;
838                                 }
839
840
841                         if ((cb != NULL) && (s->state != state))
842                                 {
843                                 new_state=s->state;
844                                 s->state=state;
845                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
846                                 s->state=new_state;
847                                 }
848                         }
849                 skip=0;
850                 }
851 end:
852         /* BIO_flush(s->wbio); */
853
854         s->in_handshake--;
855         if (cb != NULL)
856                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
857         return(ret);
858         }
859
860 int ssl3_send_hello_request(SSL *s)
861         {
862
863         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
864                 {
865                 ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0);
866                 s->state=SSL3_ST_SW_HELLO_REQ_B;
867                 }
868
869         /* SSL3_ST_SW_HELLO_REQ_B */
870         return ssl_do_write(s);
871         }
872
873 int ssl3_check_client_hello(SSL *s)
874         {
875         int ok;
876         long n;
877
878         /* this function is called when we really expect a Certificate message,
879          * so permit appropriate message length */
880         n=s->method->ssl_get_message(s,
881                 SSL3_ST_SR_CERT_A,
882                 SSL3_ST_SR_CERT_B,
883                 -1,
884                 s->max_cert_list,
885                 &ok);
886         if (!ok) return((int)n);
887         s->s3->tmp.reuse_message = 1;
888         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
889                 {
890                 /* We only allow the client to restart the handshake once per
891                  * negotiation. */
892                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
893                         {
894                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
895                         return -1;
896                         }
897                 /* Throw away what we have done so far in the current handshake,
898                  * which will now be aborted. (A full SSL_clear would be too much.) */
899 #ifndef OPENSSL_NO_DH
900                 if (s->s3->tmp.dh != NULL)
901                         {
902                         DH_free(s->s3->tmp.dh);
903                         s->s3->tmp.dh = NULL;
904                         }
905 #endif
906 #ifndef OPENSSL_NO_ECDH
907                 if (s->s3->tmp.ecdh != NULL)
908                         {
909                         EC_KEY_free(s->s3->tmp.ecdh);
910                         s->s3->tmp.ecdh = NULL;
911                         }
912 #endif
913                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
914                 return 2;
915                 }
916         return 1;
917 }
918
919 int ssl3_get_client_hello(SSL *s)
920         {
921         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
922         unsigned int cookie_len;
923         long n;
924         unsigned long id;
925         unsigned char *p,*d;
926         SSL_CIPHER *c;
927 #ifndef OPENSSL_NO_COMP
928         unsigned char *q;
929         SSL_COMP *comp=NULL;
930 #endif
931         STACK_OF(SSL_CIPHER) *ciphers=NULL;
932
933         if (s->state == SSL3_ST_SR_CLNT_HELLO_C && !s->first_packet)
934                 goto retry_cert;
935
936         /* We do this so that we will respond with our native type.
937          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
938          * This down switching should be handled by a different method.
939          * If we are SSLv3, we will respond with SSLv3, even if prompted with
940          * TLSv1.
941          */
942         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
943                 )
944                 {
945                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
946                 }
947         s->first_packet=1;
948         n=s->method->ssl_get_message(s,
949                 SSL3_ST_SR_CLNT_HELLO_B,
950                 SSL3_ST_SR_CLNT_HELLO_C,
951                 SSL3_MT_CLIENT_HELLO,
952                 SSL3_RT_MAX_PLAIN_LENGTH,
953                 &ok);
954
955         if (!ok) return((int)n);
956         s->first_packet=0;
957         d=p=(unsigned char *)s->init_msg;
958
959         /* use version from inside client hello, not from record header
960          * (may differ: see RFC 2246, Appendix E, second paragraph) */
961         s->client_version=(((int)p[0])<<8)|(int)p[1];
962         p+=2;
963
964         if (SSL_IS_DTLS(s)  ?   (s->client_version > s->version &&
965                                  s->method->version != DTLS_ANY_VERSION)
966                             :   (s->client_version < s->version))
967                 {
968                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
969                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
970                         !s->enc_write_ctx && !s->write_hash)
971                         {
972                         /* similar to ssl3_get_record, send alert using remote version number */
973                         s->version = s->client_version;
974                         }
975                 al = SSL_AD_PROTOCOL_VERSION;
976                 goto f_err;
977                 }
978
979         /* If we require cookies and this ClientHello doesn't
980          * contain one, just return since we do not want to
981          * allocate any memory yet. So check cookie length...
982          */
983         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
984                 {
985                 unsigned int session_length, cookie_length;
986                 
987                 session_length = *(p + SSL3_RANDOM_SIZE);
988                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
989
990                 if (cookie_length == 0)
991                         return 1;
992                 }
993
994         /* load the client random */
995         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
996         p+=SSL3_RANDOM_SIZE;
997
998         /* get the session-id */
999         j= *(p++);
1000
1001         s->hit=0;
1002         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1003          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1004          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1005          * than a change to default behavior so that applications relying on this for security
1006          * won't even compile against older library versions).
1007          *
1008          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1009          * renegotiation but not a new session (s->new_session remains unset): for servers,
1010          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1011          * setting will be ignored.
1012          */
1013         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1014                 {
1015                 if (!ssl_get_new_session(s,1))
1016                         goto err;
1017                 }
1018         else
1019                 {
1020                 i=ssl_get_prev_session(s, p, j, d + n);
1021                 if (i == 1)
1022                         { /* previous session */
1023                         s->hit=1;
1024                         }
1025                 else if (i == -1)
1026                         goto err;
1027                 else /* i == 0 */
1028                         {
1029                         if (!ssl_get_new_session(s,1))
1030                                 goto err;
1031                         }
1032                 }
1033
1034         p+=j;
1035
1036         if (SSL_IS_DTLS(s))
1037                 {
1038                 /* cookie stuff */
1039                 cookie_len = *(p++);
1040
1041                 /* 
1042                  * The ClientHello may contain a cookie even if the
1043                  * HelloVerify message has not been sent--make sure that it
1044                  * does not cause an overflow.
1045                  */
1046                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1047                         {
1048                         /* too much data */
1049                         al = SSL_AD_DECODE_ERROR;
1050                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1051                         goto f_err;
1052                         }
1053
1054                 /* verify the cookie if appropriate option is set. */
1055                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1056                         cookie_len > 0)
1057                         {
1058                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1059
1060                         if ( s->ctx->app_verify_cookie_cb != NULL)
1061                                 {
1062                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1063                                         cookie_len) == 0)
1064                                         {
1065                                         al=SSL_AD_HANDSHAKE_FAILURE;
1066                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1067                                                 SSL_R_COOKIE_MISMATCH);
1068                                         goto f_err;
1069                                         }
1070                                 /* else cookie verification succeeded */
1071                                 }
1072                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1073                                                   s->d1->cookie_len) != 0) /* default verification */
1074                                 {
1075                                         al=SSL_AD_HANDSHAKE_FAILURE;
1076                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1077                                                 SSL_R_COOKIE_MISMATCH);
1078                                         goto f_err;
1079                                 }
1080                         /* Set to -2 so if successful we return 2 */
1081                         ret = -2;
1082                         }
1083
1084                 p += cookie_len;
1085                 if (s->method->version == DTLS_ANY_VERSION)
1086                         {
1087                         /* Select version to use */
1088                         if (s->client_version <= DTLS1_2_VERSION &&
1089                                 !(s->options & SSL_OP_NO_DTLSv1_2))
1090                                 {
1091                                 s->version = DTLS1_2_VERSION;
1092                                 s->method = DTLSv1_2_server_method();
1093                                 }
1094                         else if (tls1_suiteb(s))
1095                                 {
1096                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1097                                 s->version = s->client_version;
1098                                 al = SSL_AD_PROTOCOL_VERSION;
1099                                 goto f_err;
1100                                 }
1101                         else if (s->client_version <= DTLS1_VERSION &&
1102                                 !(s->options & SSL_OP_NO_DTLSv1))
1103                                 {
1104                                 s->version = DTLS1_VERSION;
1105                                 s->method = DTLSv1_server_method();
1106                                 }
1107                         else
1108                                 {
1109                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
1110                                 s->version = s->client_version;
1111                                 al = SSL_AD_PROTOCOL_VERSION;
1112                                 goto f_err;
1113                                 }
1114                         s->session->ssl_version = s->version;
1115                         }
1116                 }
1117
1118         n2s(p,i);
1119         if ((i == 0) && (j != 0))
1120                 {
1121                 /* we need a cipher if we are not resuming a session */
1122                 al=SSL_AD_ILLEGAL_PARAMETER;
1123                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1124                 goto f_err;
1125                 }
1126         if ((p+i) >= (d+n))
1127                 {
1128                 /* not enough data */
1129                 al=SSL_AD_DECODE_ERROR;
1130                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1131                 goto f_err;
1132                 }
1133         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1134                 == NULL))
1135                 {
1136                 goto err;
1137                 }
1138         p+=i;
1139
1140         /* If it is a hit, check that the cipher is in the list */
1141         if ((s->hit) && (i > 0))
1142                 {
1143                 j=0;
1144                 id=s->session->cipher->id;
1145
1146 #ifdef CIPHER_DEBUG
1147                 printf("client sent %d ciphers\n",sk_num(ciphers));
1148 #endif
1149                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1150                         {
1151                         c=sk_SSL_CIPHER_value(ciphers,i);
1152 #ifdef CIPHER_DEBUG
1153                         printf("client [%2d of %2d]:%s\n",
1154                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1155 #endif
1156                         if (c->id == id)
1157                                 {
1158                                 j=1;
1159                                 break;
1160                                 }
1161                         }
1162 /* Disabled because it can be used in a ciphersuite downgrade
1163  * attack: CVE-2010-4180.
1164  */
1165 #if 0
1166                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1167                         {
1168                         /* Special case as client bug workaround: the previously used cipher may
1169                          * not be in the current list, the client instead might be trying to
1170                          * continue using a cipher that before wasn't chosen due to server
1171                          * preferences.  We'll have to reject the connection if the cipher is not
1172                          * enabled, though. */
1173                         c = sk_SSL_CIPHER_value(ciphers, 0);
1174                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1175                                 {
1176                                 s->session->cipher = c;
1177                                 j = 1;
1178                                 }
1179                         }
1180 #endif
1181                 if (j == 0)
1182                         {
1183                         /* we need to have the cipher in the cipher
1184                          * list if we are asked to reuse it */
1185                         al=SSL_AD_ILLEGAL_PARAMETER;
1186                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1187                         goto f_err;
1188                         }
1189                 }
1190
1191         /* compression */
1192         i= *(p++);
1193         if ((p+i) > (d+n))
1194                 {
1195                 /* not enough data */
1196                 al=SSL_AD_DECODE_ERROR;
1197                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1198                 goto f_err;
1199                 }
1200 #ifndef OPENSSL_NO_COMP
1201         q=p;
1202 #endif
1203         for (j=0; j<i; j++)
1204                 {
1205                 if (p[j] == 0) break;
1206                 }
1207
1208         p+=i;
1209         if (j >= i)
1210                 {
1211                 /* no compress */
1212                 al=SSL_AD_DECODE_ERROR;
1213                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1214                 goto f_err;
1215                 }
1216
1217 #ifndef OPENSSL_NO_TLSEXT
1218         /* TLS extensions*/
1219         if (s->version >= SSL3_VERSION)
1220                 {
1221                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1222                         {
1223                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1224                         goto err;
1225                         }
1226                 }
1227
1228         /* Check if we want to use external pre-shared secret for this
1229          * handshake for not reused session only. We need to generate
1230          * server_random before calling tls_session_secret_cb in order to allow
1231          * SessionTicket processing to use it in key derivation. */
1232         {
1233                 unsigned char *pos;
1234                 pos=s->s3->server_random;
1235                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1236                         {
1237                         goto f_err;
1238                         }
1239         }
1240
1241         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1242                 {
1243                 SSL_CIPHER *pref_cipher=NULL;
1244
1245                 s->session->master_key_length=sizeof(s->session->master_key);
1246                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1247                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1248                         {
1249                         s->hit=1;
1250                         s->session->ciphers=ciphers;
1251                         s->session->verify_result=X509_V_OK;
1252
1253                         ciphers=NULL;
1254
1255                         /* check if some cipher was preferred by call back */
1256                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1257                         if (pref_cipher == NULL)
1258                                 {
1259                                 al=SSL_AD_HANDSHAKE_FAILURE;
1260                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1261                                 goto f_err;
1262                                 }
1263
1264                         s->session->cipher=pref_cipher;
1265
1266                         if (s->cipher_list)
1267                                 sk_SSL_CIPHER_free(s->cipher_list);
1268
1269                         if (s->cipher_list_by_id)
1270                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1271
1272                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1273                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1274                         }
1275                 }
1276 #endif
1277
1278         /* Worst case, we will use the NULL compression, but if we have other
1279          * options, we will now look for them.  We have i-1 compression
1280          * algorithms from the client, starting at q. */
1281         s->s3->tmp.new_compression=NULL;
1282 #ifndef OPENSSL_NO_COMP
1283         /* This only happens if we have a cache hit */
1284         if (s->session->compress_meth != 0)
1285                 {
1286                 int m, comp_id = s->session->compress_meth;
1287                 /* Perform sanity checks on resumed compression algorithm */
1288                 /* Can't disable compression */
1289                 if (!ssl_allow_compression(s))
1290                         {
1291                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1292                         goto f_err;
1293                         }
1294                 /* Look for resumed compression method */
1295                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1296                         {
1297                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1298                         if (comp_id == comp->id)
1299                                 {
1300                                 s->s3->tmp.new_compression=comp;
1301                                 break;
1302                                 }
1303                         }
1304                 if (s->s3->tmp.new_compression == NULL)
1305                         {
1306                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1307                         goto f_err;
1308                         }
1309                 /* Look for resumed method in compression list */
1310                 for (m = 0; m < i; m++)
1311                         {
1312                         if (q[m] == comp_id)
1313                                 break;
1314                         }
1315                 if (m >= i)
1316                         {
1317                         al=SSL_AD_ILLEGAL_PARAMETER;
1318                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1319                         goto f_err;
1320                         }
1321                 }
1322         else if (s->hit)
1323                 comp = NULL;
1324         else if (ssl_allow_compression(s) && s->ctx->comp_methods)
1325                 { /* See if we have a match */
1326                 int m,nn,o,v,done=0;
1327
1328                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1329                 for (m=0; m<nn; m++)
1330                         {
1331                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1332                         v=comp->id;
1333                         for (o=0; o<i; o++)
1334                                 {
1335                                 if (v == q[o])
1336                                         {
1337                                         done=1;
1338                                         break;
1339                                         }
1340                                 }
1341                         if (done) break;
1342                         }
1343                 if (done)
1344                         s->s3->tmp.new_compression=comp;
1345                 else
1346                         comp=NULL;
1347                 }
1348 #else
1349         /* If compression is disabled we'd better not try to resume a session
1350          * using compression.
1351          */
1352         if (s->session->compress_meth != 0)
1353                 {
1354                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1355                 goto f_err;
1356                 }
1357 #endif
1358
1359         /* Given s->session->ciphers and SSL_get_ciphers, we must
1360          * pick a cipher */
1361
1362         if (!s->hit)
1363                 {
1364 #ifdef OPENSSL_NO_COMP
1365                 s->session->compress_meth=0;
1366 #else
1367                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1368 #endif
1369                 if (s->session->ciphers != NULL)
1370                         sk_SSL_CIPHER_free(s->session->ciphers);
1371                 s->session->ciphers=ciphers;
1372                 if (ciphers == NULL)
1373                         {
1374                         al=SSL_AD_ILLEGAL_PARAMETER;
1375                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1376                         goto f_err;
1377                         }
1378                 ciphers=NULL;
1379                 /* Let cert callback update server certificates if required */
1380                 retry_cert:             
1381                 if (s->cert->cert_cb)
1382                         {
1383                         int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1384                         if (rv == 0)
1385                                 {
1386                                 al=SSL_AD_INTERNAL_ERROR;
1387                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1388                                 goto f_err;
1389                                 }
1390                         if (rv < 0)
1391                                 {
1392                                 s->rwstate=SSL_X509_LOOKUP;
1393                                 return -1;
1394                                 }
1395                         s->rwstate = SSL_NOTHING;
1396                         }
1397                 c=ssl3_choose_cipher(s,s->session->ciphers,
1398                                      SSL_get_ciphers(s));
1399
1400                 if (c == NULL)
1401                         {
1402                         al=SSL_AD_HANDSHAKE_FAILURE;
1403                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1404                         goto f_err;
1405                         }
1406                 s->s3->tmp.new_cipher=c;
1407                 /* check whether we should disable session resumption */
1408                 if (s->not_resumable_session_cb != NULL)
1409                         s->session->not_resumable=s->not_resumable_session_cb(s,
1410                                 ((c->algorithm_mkey & (SSL_kDHE | SSL_kECDHE)) != 0));
1411                 if (s->session->not_resumable)
1412                         /* do not send a session ticket */
1413                         s->tlsext_ticket_expected = 0;
1414                 }
1415         else
1416                 {
1417                 /* Session-id reuse */
1418 #ifdef REUSE_CIPHER_BUG
1419                 STACK_OF(SSL_CIPHER) *sk;
1420                 SSL_CIPHER *nc=NULL;
1421                 SSL_CIPHER *ec=NULL;
1422
1423                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1424                         {
1425                         sk=s->session->ciphers;
1426                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1427                                 {
1428                                 c=sk_SSL_CIPHER_value(sk,i);
1429                                 if (c->algorithm_enc & SSL_eNULL)
1430                                         nc=c;
1431                                 if (SSL_C_IS_EXPORT(c))
1432                                         ec=c;
1433                                 }
1434                         if (nc != NULL)
1435                                 s->s3->tmp.new_cipher=nc;
1436                         else if (ec != NULL)
1437                                 s->s3->tmp.new_cipher=ec;
1438                         else
1439                                 s->s3->tmp.new_cipher=s->session->cipher;
1440                         }
1441                 else
1442 #endif
1443                 s->s3->tmp.new_cipher=s->session->cipher;
1444                 }
1445
1446         if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER))
1447                 {
1448                 if (!ssl3_digest_cached_records(s))
1449                         goto f_err;
1450                 }
1451         
1452         /* we now have the following setup. 
1453          * client_random
1454          * cipher_list          - our prefered list of ciphers
1455          * ciphers              - the clients prefered list of ciphers
1456          * compression          - basically ignored right now
1457          * ssl version is set   - sslv3
1458          * s->session           - The ssl session has been setup.
1459          * s->hit               - session reuse flag
1460          * s->s3->tmp.new_cipher- the new cipher to use.
1461          */
1462
1463         /* Handles TLS extensions that we couldn't check earlier */
1464         if (s->version >= SSL3_VERSION)
1465                 {
1466                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1467                         {
1468                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1469                         goto err;
1470                         }
1471                 }
1472
1473         if (ret < 0) ret=-ret;
1474         if (0)
1475                 {
1476 f_err:
1477                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1478                 }
1479 err:
1480         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1481         return ret < 0 ? -1 : ret;
1482         }
1483
1484 int ssl3_send_server_hello(SSL *s)
1485         {
1486         unsigned char *buf;
1487         unsigned char *p,*d;
1488         int i,sl;
1489         int al = 0;
1490         unsigned long l;
1491
1492         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1493                 {
1494                 buf=(unsigned char *)s->init_buf->data;
1495 #ifdef OPENSSL_NO_TLSEXT
1496                 p=s->s3->server_random;
1497                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1498                         return -1;
1499 #endif
1500                 /* Do the message type and length last */
1501                 d=p= ssl_handshake_start(s);
1502
1503                 *(p++)=s->version>>8;
1504                 *(p++)=s->version&0xff;
1505
1506                 /* Random stuff */
1507                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1508                 p+=SSL3_RANDOM_SIZE;
1509
1510                 /* There are several cases for the session ID to send
1511                  * back in the server hello:
1512                  * - For session reuse from the session cache,
1513                  *   we send back the old session ID.
1514                  * - If stateless session reuse (using a session ticket)
1515                  *   is successful, we send back the client's "session ID"
1516                  *   (which doesn't actually identify the session).
1517                  * - If it is a new session, we send back the new
1518                  *   session ID.
1519                  * - However, if we want the new session to be single-use,
1520                  *   we send back a 0-length session ID.
1521                  * s->hit is non-zero in either case of session reuse,
1522                  * so the following won't overwrite an ID that we're supposed
1523                  * to send back.
1524                  */
1525                 if (s->session->not_resumable ||
1526                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1527                                 && !s->hit))
1528                         s->session->session_id_length=0;
1529
1530                 sl=s->session->session_id_length;
1531                 if (sl > (int)sizeof(s->session->session_id))
1532                         {
1533                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1534                         return -1;
1535                         }
1536                 *(p++)=sl;
1537                 memcpy(p,s->session->session_id,sl);
1538                 p+=sl;
1539
1540                 /* put the cipher */
1541                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1542                 p+=i;
1543
1544                 /* put the compression method */
1545 #ifdef OPENSSL_NO_COMP
1546                         *(p++)=0;
1547 #else
1548                 if (s->s3->tmp.new_compression == NULL)
1549                         *(p++)=0;
1550                 else
1551                         *(p++)=s->s3->tmp.new_compression->id;
1552 #endif
1553 #ifndef OPENSSL_NO_TLSEXT
1554                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1555                         {
1556                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1557                         return -1;
1558                         }
1559                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
1560                         {
1561                         ssl3_send_alert(s, SSL3_AL_FATAL, al);
1562                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1563                         return -1;
1564                         }
1565 #endif
1566                 /* do the header */
1567                 l=(p-d);
1568                 ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l);
1569                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1570                 }
1571
1572         /* SSL3_ST_SW_SRVR_HELLO_B */
1573         return ssl_do_write(s);
1574         }
1575
1576 int ssl3_send_server_done(SSL *s)
1577         {
1578
1579         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1580                 {
1581                 ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0);
1582                 s->state = SSL3_ST_SW_SRVR_DONE_B;
1583                 }
1584
1585         /* SSL3_ST_SW_SRVR_DONE_B */
1586         return ssl_do_write(s);
1587         }
1588
1589 int ssl3_send_server_key_exchange(SSL *s)
1590         {
1591 #ifndef OPENSSL_NO_RSA
1592         unsigned char *q;
1593         int j,num;
1594         RSA *rsa;
1595         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1596         unsigned int u;
1597 #endif
1598 #ifndef OPENSSL_NO_DH
1599         DH *dh=NULL,*dhp;
1600 #endif
1601 #ifndef OPENSSL_NO_ECDH
1602         EC_KEY *ecdh=NULL, *ecdhp;
1603         unsigned char *encodedPoint = NULL;
1604         int encodedlen = 0;
1605         int curve_id = 0;
1606         BN_CTX *bn_ctx = NULL; 
1607 #endif
1608         EVP_PKEY *pkey;
1609         const EVP_MD *md = NULL;
1610         unsigned char *p,*d;
1611         int al,i;
1612         unsigned long type;
1613         int n;
1614         CERT *cert;
1615         BIGNUM *r[4];
1616         int nr[4],kn;
1617         BUF_MEM *buf;
1618         EVP_MD_CTX md_ctx;
1619
1620         EVP_MD_CTX_init(&md_ctx);
1621         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1622                 {
1623                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1624                 cert=s->cert;
1625
1626                 buf=s->init_buf;
1627
1628                 r[0]=r[1]=r[2]=r[3]=NULL;
1629                 n=0;
1630 #ifndef OPENSSL_NO_RSA
1631                 if (type & SSL_kRSA)
1632                         {
1633                         rsa=cert->rsa_tmp;
1634                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1635                                 {
1636                                 rsa=s->cert->rsa_tmp_cb(s,
1637                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1638                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1639                                 if(rsa == NULL)
1640                                 {
1641                                         al=SSL_AD_HANDSHAKE_FAILURE;
1642                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1643                                         goto f_err;
1644                                 }
1645                                 RSA_up_ref(rsa);
1646                                 cert->rsa_tmp=rsa;
1647                                 }
1648                         if (rsa == NULL)
1649                                 {
1650                                 al=SSL_AD_HANDSHAKE_FAILURE;
1651                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1652                                 goto f_err;
1653                                 }
1654                         r[0]=rsa->n;
1655                         r[1]=rsa->e;
1656                         s->s3->tmp.use_rsa_tmp=1;
1657                         }
1658                 else
1659 #endif
1660 #ifndef OPENSSL_NO_DH
1661                         if (type & SSL_kDHE)
1662                         {
1663                         if (s->cert->dh_tmp_auto)
1664                                 {
1665                                 dhp = ssl_get_auto_dh(s);
1666                                 if (dhp == NULL)
1667                                         {
1668                                         al=SSL_AD_INTERNAL_ERROR;
1669                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1670                                         goto f_err;
1671                                         }
1672                                 }
1673                         else
1674                                 dhp=cert->dh_tmp;
1675                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1676                                 dhp=s->cert->dh_tmp_cb(s,
1677                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1678                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1679                         if (dhp == NULL)
1680                                 {
1681                                 al=SSL_AD_HANDSHAKE_FAILURE;
1682                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1683                                 goto f_err;
1684                                 }
1685                         if (!ssl_security(s, SSL_SECOP_TMP_DH,
1686                                                 DH_security_bits(dhp), 0, dhp))
1687                                 {
1688                                 al=SSL_AD_HANDSHAKE_FAILURE;
1689                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_DH_KEY_TOO_SMALL);
1690                                 goto f_err;
1691                                 }
1692                         if (s->s3->tmp.dh != NULL)
1693                                 {
1694                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1695                                 goto err;
1696                                 }
1697
1698                         if (s->cert->dh_tmp_auto)
1699                                 dh = dhp;
1700                         else if ((dh=DHparams_dup(dhp)) == NULL)
1701                                 {
1702                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1703                                 goto err;
1704                                 }
1705
1706                         s->s3->tmp.dh=dh;
1707                         if ((dhp->pub_key == NULL ||
1708                              dhp->priv_key == NULL ||
1709                              (s->options & SSL_OP_SINGLE_DH_USE)))
1710                                 {
1711                                 if(!DH_generate_key(dh))
1712                                     {
1713                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1714                                            ERR_R_DH_LIB);
1715                                     goto err;
1716                                     }
1717                                 }
1718                         else
1719                                 {
1720                                 dh->pub_key=BN_dup(dhp->pub_key);
1721                                 dh->priv_key=BN_dup(dhp->priv_key);
1722                                 if ((dh->pub_key == NULL) ||
1723                                         (dh->priv_key == NULL))
1724                                         {
1725                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1726                                         goto err;
1727                                         }
1728                                 }
1729                         r[0]=dh->p;
1730                         r[1]=dh->g;
1731                         r[2]=dh->pub_key;
1732                         }
1733                 else 
1734 #endif
1735 #ifndef OPENSSL_NO_ECDH
1736                         if (type & SSL_kECDHE)
1737                         {
1738                         const EC_GROUP *group;
1739
1740                         ecdhp=cert->ecdh_tmp;
1741                         if (s->cert->ecdh_tmp_auto)
1742                                 {
1743                                 /* Get NID of appropriate shared curve */
1744                                 int nid = tls1_shared_curve(s, -2);
1745                                 if (nid != NID_undef)
1746                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1747                                 }
1748                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1749                                 {
1750                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1751                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1752                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1753                                 }
1754                         if (ecdhp == NULL)
1755                                 {
1756                                 al=SSL_AD_HANDSHAKE_FAILURE;
1757                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1758                                 goto f_err;
1759                                 }
1760
1761                         if (s->s3->tmp.ecdh != NULL)
1762                                 {
1763                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1764                                 goto err;
1765                                 }
1766
1767                         /* Duplicate the ECDH structure. */
1768                         if (ecdhp == NULL)
1769                                 {
1770                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1771                                 goto err;
1772                                 }
1773                         if (s->cert->ecdh_tmp_auto)
1774                                 ecdh = ecdhp;
1775                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1776                                 {
1777                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1778                                 goto err;
1779                                 }
1780
1781                         s->s3->tmp.ecdh=ecdh;
1782                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1783                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1784                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1785                                 {
1786                                 if(!EC_KEY_generate_key(ecdh))
1787                                     {
1788                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1789                                     goto err;
1790                                     }
1791                                 }
1792
1793                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1794                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1795                             (EC_KEY_get0_private_key(ecdh) == NULL))
1796                                 {
1797                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1798                                 goto err;
1799                                 }
1800
1801                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1802                             (EC_GROUP_get_degree(group) > 163)) 
1803                                 {
1804                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1805                                 goto err;
1806                                 }
1807
1808                         /* XXX: For now, we only support ephemeral ECDH
1809                          * keys over named (not generic) curves. For 
1810                          * supported named curves, curve_id is non-zero.
1811                          */
1812                         if ((curve_id = 
1813                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1814                             == 0)
1815                                 {
1816                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1817                                 goto err;
1818                                 }
1819
1820                         /* Encode the public key.
1821                          * First check the size of encoding and
1822                          * allocate memory accordingly.
1823                          */
1824                         encodedlen = EC_POINT_point2oct(group, 
1825                             EC_KEY_get0_public_key(ecdh),
1826                             POINT_CONVERSION_UNCOMPRESSED, 
1827                             NULL, 0, NULL);
1828
1829                         encodedPoint = (unsigned char *) 
1830                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1831                         bn_ctx = BN_CTX_new();
1832                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1833                                 {
1834                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1835                                 goto err;
1836                                 }
1837
1838
1839                         encodedlen = EC_POINT_point2oct(group, 
1840                             EC_KEY_get0_public_key(ecdh), 
1841                             POINT_CONVERSION_UNCOMPRESSED, 
1842                             encodedPoint, encodedlen, bn_ctx);
1843
1844                         if (encodedlen == 0) 
1845                                 {
1846                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1847                                 goto err;
1848                                 }
1849
1850                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1851
1852                         /* XXX: For now, we only support named (not 
1853                          * generic) curves in ECDH ephemeral key exchanges.
1854                          * In this situation, we need four additional bytes
1855                          * to encode the entire ServerECDHParams
1856                          * structure. 
1857                          */
1858                         n = 4 + encodedlen;
1859
1860                         /* We'll generate the serverKeyExchange message
1861                          * explicitly so we can set these to NULLs
1862                          */
1863                         r[0]=NULL;
1864                         r[1]=NULL;
1865                         r[2]=NULL;
1866                         r[3]=NULL;
1867                         }
1868                 else 
1869 #endif /* !OPENSSL_NO_ECDH */
1870 #ifndef OPENSSL_NO_PSK
1871                         if (type & SSL_kPSK)
1872                                 {
1873                                 /* reserve size for record length and PSK identity hint*/
1874                                 n+=2+strlen(s->ctx->psk_identity_hint);
1875                                 }
1876                         else
1877 #endif /* !OPENSSL_NO_PSK */
1878 #ifndef OPENSSL_NO_SRP
1879                 if (type & SSL_kSRP)
1880                         {
1881                         if ((s->srp_ctx.N == NULL) ||
1882                                 (s->srp_ctx.g == NULL) ||
1883                                 (s->srp_ctx.s == NULL) ||
1884                                 (s->srp_ctx.B == NULL))
1885                                 {
1886                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1887                                 goto err;
1888                                 }
1889                         r[0]=s->srp_ctx.N;
1890                         r[1]=s->srp_ctx.g;
1891                         r[2]=s->srp_ctx.s;
1892                         r[3]=s->srp_ctx.B;
1893                         }
1894                 else 
1895 #endif
1896                         {
1897                         al=SSL_AD_HANDSHAKE_FAILURE;
1898                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1899                         goto f_err;
1900                         }
1901                 for (i=0; i < 4 && r[i] != NULL; i++)
1902                         {
1903                         nr[i]=BN_num_bytes(r[i]);
1904 #ifndef OPENSSL_NO_SRP
1905                         if ((i == 2) && (type & SSL_kSRP))
1906                                 n+=1+nr[i];
1907                         else
1908 #endif
1909                         n+=2+nr[i];
1910                         }
1911
1912                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1913                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1914                         {
1915                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1916                                 == NULL)
1917                                 {
1918                                 al=SSL_AD_DECODE_ERROR;
1919                                 goto f_err;
1920                                 }
1921                         kn=EVP_PKEY_size(pkey);
1922                         }
1923                 else
1924                         {
1925                         pkey=NULL;
1926                         kn=0;
1927                         }
1928
1929                 if (!BUF_MEM_grow_clean(buf,n+SSL_HM_HEADER_LENGTH(s)+kn))
1930                         {
1931                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1932                         goto err;
1933                         }
1934                 d = p = ssl_handshake_start(s);
1935
1936                 for (i=0; i < 4 && r[i] != NULL; i++)
1937                         {
1938 #ifndef OPENSSL_NO_SRP
1939                         if ((i == 2) && (type & SSL_kSRP))
1940                                 {
1941                                 *p = nr[i];
1942                                 p++;
1943                                 }
1944                         else
1945 #endif
1946                         s2n(nr[i],p);
1947                         BN_bn2bin(r[i],p);
1948                         p+=nr[i];
1949                         }
1950
1951 #ifndef OPENSSL_NO_ECDH
1952                 if (type & SSL_kECDHE) 
1953                         {
1954                         /* XXX: For now, we only support named (not generic) curves.
1955                          * In this situation, the serverKeyExchange message has:
1956                          * [1 byte CurveType], [2 byte CurveName]
1957                          * [1 byte length of encoded point], followed by
1958                          * the actual encoded point itself
1959                          */
1960                         *p = NAMED_CURVE_TYPE;
1961                         p += 1;
1962                         *p = 0;
1963                         p += 1;
1964                         *p = curve_id;
1965                         p += 1;
1966                         *p = encodedlen;
1967                         p += 1;
1968                         memcpy((unsigned char*)p, 
1969                             (unsigned char *)encodedPoint, 
1970                             encodedlen);
1971                         OPENSSL_free(encodedPoint);
1972                         encodedPoint = NULL;
1973                         p += encodedlen;
1974                         }
1975 #endif
1976
1977 #ifndef OPENSSL_NO_PSK
1978                 if (type & SSL_kPSK)
1979                         {
1980                         /* copy PSK identity hint */
1981                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1982                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1983                         p+=strlen(s->ctx->psk_identity_hint);
1984                         }
1985 #endif
1986
1987                 /* not anonymous */
1988                 if (pkey != NULL)
1989                         {
1990                         /* n is the length of the params, they start at &(d[4])
1991                          * and p points to the space at the end. */
1992 #ifndef OPENSSL_NO_RSA
1993                         if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1994                                 {
1995                                 q=md_buf;
1996                                 j=0;
1997                                 for (num=2; num > 0; num--)
1998                                         {
1999                                         EVP_MD_CTX_set_flags(&md_ctx,
2000                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
2001                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
2002                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
2003                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2004                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2005                                         EVP_DigestUpdate(&md_ctx,d,n);
2006                                         EVP_DigestFinal_ex(&md_ctx,q,
2007                                                 (unsigned int *)&i);
2008                                         q+=i;
2009                                         j+=i;
2010                                         }
2011                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
2012                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
2013                                         {
2014                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
2015                                         goto err;
2016                                         }
2017                                 s2n(u,p);
2018                                 n+=u+2;
2019                                 }
2020                         else
2021 #endif
2022                         if (md)
2023                                 {
2024                                 /* send signature algorithm */
2025                                 if (SSL_USE_SIGALGS(s))
2026                                         {
2027                                         if (!tls12_get_sigandhash(p, pkey, md))
2028                                                 {
2029                                                 /* Should never happen */
2030                                                 al=SSL_AD_INTERNAL_ERROR;
2031                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2032                                                 goto f_err;
2033                                                 }
2034                                         p+=2;
2035                                         }
2036 #ifdef SSL_DEBUG
2037                                 fprintf(stderr, "Using hash %s\n",
2038                                                         EVP_MD_name(md));
2039 #endif
2040                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2041                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2042                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2043                                 EVP_SignUpdate(&md_ctx,d,n);
2044                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2045                                         (unsigned int *)&i,pkey))
2046                                         {
2047                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2048                                         goto err;
2049                                         }
2050                                 s2n(i,p);
2051                                 n+=i+2;
2052                                 if (SSL_USE_SIGALGS(s))
2053                                         n+= 2;
2054                                 }
2055                         else
2056                                 {
2057                                 /* Is this error check actually needed? */
2058                                 al=SSL_AD_HANDSHAKE_FAILURE;
2059                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2060                                 goto f_err;
2061                                 }
2062                         }
2063
2064                 ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n);
2065                 }
2066
2067         s->state = SSL3_ST_SW_KEY_EXCH_B;
2068         EVP_MD_CTX_cleanup(&md_ctx);
2069         return ssl_do_write(s);
2070 f_err:
2071         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2072 err:
2073 #ifndef OPENSSL_NO_ECDH
2074         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2075         BN_CTX_free(bn_ctx);
2076 #endif
2077         EVP_MD_CTX_cleanup(&md_ctx);
2078         return(-1);
2079         }
2080
2081 int ssl3_send_certificate_request(SSL *s)
2082         {
2083         unsigned char *p,*d;
2084         int i,j,nl,off,n;
2085         STACK_OF(X509_NAME) *sk=NULL;
2086         X509_NAME *name;
2087         BUF_MEM *buf;
2088
2089         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2090                 {
2091                 buf=s->init_buf;
2092
2093                 d=p=ssl_handshake_start(s);
2094
2095                 /* get the list of acceptable cert types */
2096                 p++;
2097                 n=ssl3_get_req_cert_type(s,p);
2098                 d[0]=n;
2099                 p+=n;
2100                 n++;
2101
2102                 if (SSL_USE_SIGALGS(s))
2103                         {
2104                         const unsigned char *psigs;
2105                         unsigned char *etmp = p;
2106                         nl = tls12_get_psigalgs(s, &psigs);
2107                         /* Skip over length for now */
2108                         p += 2;
2109                         nl = tls12_copy_sigalgs(s, p, psigs, nl);
2110                         /* Now fill in length */
2111                         s2n(nl, etmp);
2112                         p += nl;
2113                         n += nl + 2;
2114                         }
2115
2116                 off=n;
2117                 p+=2;
2118                 n+=2;
2119
2120                 sk=SSL_get_client_CA_list(s);
2121                 nl=0;
2122                 if (sk != NULL)
2123                         {
2124                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2125                                 {
2126                                 name=sk_X509_NAME_value(sk,i);
2127                                 j=i2d_X509_NAME(name,NULL);
2128                                 if (!BUF_MEM_grow_clean(buf,SSL_HM_HEADER_LENGTH(s)+n+j+2))
2129                                         {
2130                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2131                                         goto err;
2132                                         }
2133                                 p = ssl_handshake_start(s) + n;
2134                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2135                                         {
2136                                         s2n(j,p);
2137                                         i2d_X509_NAME(name,&p);
2138                                         n+=2+j;
2139                                         nl+=2+j;
2140                                         }
2141                                 else
2142                                         {
2143                                         d=p;
2144                                         i2d_X509_NAME(name,&p);
2145                                         j-=2; s2n(j,d); j+=2;
2146                                         n+=j;
2147                                         nl+=j;
2148                                         }
2149                                 }
2150                         }
2151                 /* else no CA names */
2152                 p = ssl_handshake_start(s) + off;
2153                 s2n(nl,p);
2154
2155                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n);
2156
2157 #ifdef NETSCAPE_HANG_BUG
2158                 if (!SSL_IS_DTLS(s))
2159                         {
2160                         if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2161                                 {
2162                                 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2163                                 goto err;
2164                                 }
2165                         p=(unsigned char *)s->init_buf->data + s->init_num;
2166                         /* do the header */
2167                         *(p++)=SSL3_MT_SERVER_DONE;
2168                         *(p++)=0;
2169                         *(p++)=0;
2170                         *(p++)=0;
2171                         s->init_num += 4;
2172                         }
2173 #endif
2174
2175                 s->state = SSL3_ST_SW_CERT_REQ_B;
2176                 }
2177
2178         /* SSL3_ST_SW_CERT_REQ_B */
2179         return ssl_do_write(s);
2180 err:
2181         return(-1);
2182         }
2183
2184 int ssl3_get_client_key_exchange(SSL *s)
2185         {
2186         int i,al,ok;
2187         long n;
2188         unsigned long alg_k;
2189         unsigned char *p;
2190 #ifndef OPENSSL_NO_RSA
2191         RSA *rsa=NULL;
2192         EVP_PKEY *pkey=NULL;
2193 #endif
2194 #ifndef OPENSSL_NO_DH
2195         BIGNUM *pub=NULL;
2196         DH *dh_srvr, *dh_clnt = NULL;
2197 #endif
2198 #ifndef OPENSSL_NO_KRB5
2199         KSSL_ERR kssl_err;
2200 #endif /* OPENSSL_NO_KRB5 */
2201
2202 #ifndef OPENSSL_NO_ECDH
2203         EC_KEY *srvr_ecdh = NULL;
2204         EVP_PKEY *clnt_pub_pkey = NULL;
2205         EC_POINT *clnt_ecpoint = NULL;
2206         BN_CTX *bn_ctx = NULL; 
2207 #endif
2208
2209         n=s->method->ssl_get_message(s,
2210                 SSL3_ST_SR_KEY_EXCH_A,
2211                 SSL3_ST_SR_KEY_EXCH_B,
2212                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2213                 2048, /* ??? */
2214                 &ok);
2215
2216         if (!ok) return((int)n);
2217         p=(unsigned char *)s->init_msg;
2218
2219         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2220
2221 #ifndef OPENSSL_NO_RSA
2222         if (alg_k & SSL_kRSA)
2223                 {
2224                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2225                 int decrypt_len, decrypt_good_mask;
2226                 unsigned char version_good;
2227
2228                 /* FIX THIS UP EAY EAY EAY EAY */
2229                 if (s->s3->tmp.use_rsa_tmp)
2230                         {
2231                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2232                                 rsa=s->cert->rsa_tmp;
2233                         /* Don't do a callback because rsa_tmp should
2234                          * be sent already */
2235                         if (rsa == NULL)
2236                                 {
2237                                 al=SSL_AD_HANDSHAKE_FAILURE;
2238                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2239                                 goto f_err;
2240
2241                                 }
2242                         }
2243                 else
2244                         {
2245                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2246                         if (    (pkey == NULL) ||
2247                                 (pkey->type != EVP_PKEY_RSA) ||
2248                                 (pkey->pkey.rsa == NULL))
2249                                 {
2250                                 al=SSL_AD_HANDSHAKE_FAILURE;
2251                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2252                                 goto f_err;
2253                                 }
2254                         rsa=pkey->pkey.rsa;
2255                         }
2256
2257                 /* TLS and [incidentally] DTLS{0xFEFF} */
2258                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2259                         {
2260                         n2s(p,i);
2261                         if (n != i+2)
2262                                 {
2263                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2264                                         {
2265                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2266                                         goto err;
2267                                         }
2268                                 else
2269                                         p-=2;
2270                                 }
2271                         else
2272                                 n=i;
2273                         }
2274
2275                 /* We must not leak whether a decryption failure occurs because
2276                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2277                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2278                  * the TLS RFC and generates a random premaster secret for the
2279                  * case that the decrypt fails. See
2280                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2281
2282                 /* should be RAND_bytes, but we cannot work around a failure. */
2283                 if (RAND_pseudo_bytes(rand_premaster_secret,
2284                                       sizeof(rand_premaster_secret)) <= 0)
2285                         goto err;
2286                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2287                 ERR_clear_error();
2288
2289                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2290                  * decrypt_good_mask will be zero if so and non-zero otherwise. */
2291                 decrypt_good_mask = decrypt_len ^ SSL_MAX_MASTER_KEY_LENGTH;
2292
2293                 /* If the version in the decrypted pre-master secret is correct
2294                  * then version_good will be zero. The Klima-Pokorny-Rosa
2295                  * extension of Bleichenbacher's attack
2296                  * (http://eprint.iacr.org/2003/052/) exploits the version
2297                  * number check as a "bad version oracle". Thus version checks
2298                  * are done in constant time and are treated like any other
2299                  * decryption error. */
2300                 version_good = p[0] ^ (s->client_version>>8);
2301                 version_good |= p[1] ^ (s->client_version&0xff);
2302
2303                 /* The premaster secret must contain the same version number as
2304                  * the ClientHello to detect version rollback attacks
2305                  * (strangely, the protocol does not offer such protection for
2306                  * DH ciphersuites). However, buggy clients exist that send the
2307                  * negotiated protocol version instead if the server does not
2308                  * support the requested protocol version. If
2309                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2310                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2311                         {
2312                         unsigned char workaround_mask = version_good;
2313                         unsigned char workaround;
2314
2315                         /* workaround_mask will be 0xff if version_good is
2316                          * non-zero (i.e. the version match failed). Otherwise
2317                          * it'll be 0x00. */
2318                         workaround_mask |= workaround_mask >> 4;
2319                         workaround_mask |= workaround_mask >> 2;
2320                         workaround_mask |= workaround_mask >> 1;
2321                         workaround_mask = ~((workaround_mask & 1) - 1);
2322
2323                         workaround = p[0] ^ (s->version>>8);
2324                         workaround |= p[1] ^ (s->version&0xff);
2325
2326                         /* If workaround_mask is 0xff (i.e. there was a version
2327                          * mismatch) then we copy the value of workaround over
2328                          * version_good. */
2329                         version_good = (workaround & workaround_mask) |
2330                                        (version_good & ~workaround_mask);
2331                         }
2332
2333                 /* If any bits in version_good are set then they'll poision
2334                  * decrypt_good_mask and cause rand_premaster_secret to be
2335                  * used. */
2336                 decrypt_good_mask |= version_good;
2337
2338                 /* decrypt_good_mask will be zero iff decrypt_len ==
2339                  * SSL_MAX_MASTER_KEY_LENGTH and the version check passed. We
2340                  * fold the bottom 32 bits of it with an OR so that the LSB
2341                  * will be zero iff everything is good. This assumes that we'll
2342                  * never decrypt a value > 2**31 bytes, which seems safe. */
2343                 decrypt_good_mask |= decrypt_good_mask >> 16;
2344                 decrypt_good_mask |= decrypt_good_mask >> 8;
2345                 decrypt_good_mask |= decrypt_good_mask >> 4;
2346                 decrypt_good_mask |= decrypt_good_mask >> 2;
2347                 decrypt_good_mask |= decrypt_good_mask >> 1;
2348                 /* Now select only the LSB and subtract one. If decrypt_len ==
2349                  * SSL_MAX_MASTER_KEY_LENGTH and the version check passed then
2350                  * decrypt_good_mask will be all ones. Otherwise it'll be all
2351                  * zeros. */
2352                 decrypt_good_mask &= 1;
2353                 decrypt_good_mask--;
2354
2355                 /* Now copy rand_premaster_secret over p using
2356                  * decrypt_good_mask. */
2357                 for (i = 0; i < (int) sizeof(rand_premaster_secret); i++)
2358                         {
2359                         p[i] = (p[i] & decrypt_good_mask) |
2360                                (rand_premaster_secret[i] & ~decrypt_good_mask);
2361                         }
2362
2363                 s->session->master_key_length=
2364                         s->method->ssl3_enc->generate_master_secret(s,
2365                                 s->session->master_key,
2366                                 p,i);
2367                 OPENSSL_cleanse(p,i);
2368                 }
2369         else
2370 #endif
2371 #ifndef OPENSSL_NO_DH
2372                 if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
2373                 {
2374                 int idx = -1;
2375                 EVP_PKEY *skey = NULL;
2376                 if (n)
2377                         n2s(p,i);
2378                 else
2379                         i = 0;
2380                 if (n && n != i+2)
2381                         {
2382                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2383                                 {
2384                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2385                                 goto err;
2386                                 }
2387                         else
2388                                 {
2389                                 p-=2;
2390                                 i=(int)n;
2391                                 }
2392                         }
2393                 if (alg_k & SSL_kDHr)
2394                         idx = SSL_PKEY_DH_RSA;
2395                 else if (alg_k & SSL_kDHd)
2396                         idx = SSL_PKEY_DH_DSA;
2397                 if (idx >= 0)
2398                         {
2399                         skey = s->cert->pkeys[idx].privatekey;
2400                         if ((skey == NULL) ||
2401                                 (skey->type != EVP_PKEY_DH) ||
2402                                 (skey->pkey.dh == NULL))
2403                                 {
2404                                 al=SSL_AD_HANDSHAKE_FAILURE;
2405                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2406                                 goto f_err;
2407                                 }
2408                         dh_srvr = skey->pkey.dh;
2409                         }
2410                 else if (s->s3->tmp.dh == NULL)
2411                         {
2412                         al=SSL_AD_HANDSHAKE_FAILURE;
2413                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2414                         goto f_err;
2415                         }
2416                 else
2417                         dh_srvr=s->s3->tmp.dh;
2418
2419                 if (n == 0L)
2420                         {
2421                         /* Get pubkey from cert */
2422                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2423                         if (clkey)
2424                                 {
2425                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2426                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2427                                 }
2428                         if (dh_clnt == NULL)
2429                                 {
2430                                 al=SSL_AD_HANDSHAKE_FAILURE;
2431                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2432                                 goto f_err;
2433                                 }
2434                         EVP_PKEY_free(clkey);
2435                         pub = dh_clnt->pub_key;
2436                         }
2437                 else
2438                         pub=BN_bin2bn(p,i,NULL);
2439                 if (pub == NULL)
2440                         {
2441                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2442                         goto err;
2443                         }
2444
2445                 i=DH_compute_key(p,pub,dh_srvr);
2446
2447                 if (i <= 0)
2448                         {
2449                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2450                         BN_clear_free(pub);
2451                         goto err;
2452                         }
2453
2454                 DH_free(s->s3->tmp.dh);
2455                 s->s3->tmp.dh=NULL;
2456                 if (dh_clnt)
2457                         DH_free(dh_clnt);
2458                 else
2459                         BN_clear_free(pub);
2460                 pub=NULL;
2461                 s->session->master_key_length=
2462                         s->method->ssl3_enc->generate_master_secret(s,
2463                                 s->session->master_key,p,i);
2464                 OPENSSL_cleanse(p,i);
2465                 if (dh_clnt)
2466                         return 2;
2467                 }
2468         else
2469 #endif
2470 #ifndef OPENSSL_NO_KRB5
2471         if (alg_k & SSL_kKRB5)
2472                 {
2473                 krb5_error_code         krb5rc;
2474                 krb5_data               enc_ticket;
2475                 krb5_data               authenticator;
2476                 krb5_data               enc_pms;
2477                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2478                 EVP_CIPHER_CTX          ciph_ctx;
2479                 const EVP_CIPHER        *enc = NULL;
2480                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2481                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2482                                                + EVP_MAX_BLOCK_LENGTH];
2483                 int                  padl, outl;
2484                 krb5_timestamp          authtime = 0;
2485                 krb5_ticket_times       ttimes;
2486
2487                 EVP_CIPHER_CTX_init(&ciph_ctx);
2488
2489                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2490
2491                 n2s(p,i);
2492                 enc_ticket.length = i;
2493
2494                 if (n < (long)(enc_ticket.length + 6))
2495                         {
2496                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2497                                 SSL_R_DATA_LENGTH_TOO_LONG);
2498                         goto err;
2499                         }
2500
2501                 enc_ticket.data = (char *)p;
2502                 p+=enc_ticket.length;
2503
2504                 n2s(p,i);
2505                 authenticator.length = i;
2506
2507                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2508                         {
2509                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2510                                 SSL_R_DATA_LENGTH_TOO_LONG);
2511                         goto err;
2512                         }
2513
2514                 authenticator.data = (char *)p;
2515                 p+=authenticator.length;
2516
2517                 n2s(p,i);
2518                 enc_pms.length = i;
2519                 enc_pms.data = (char *)p;
2520                 p+=enc_pms.length;
2521
2522                 /* Note that the length is checked again below,
2523                 ** after decryption
2524                 */
2525                 if(enc_pms.length > sizeof pms)
2526                         {
2527                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2528                                SSL_R_DATA_LENGTH_TOO_LONG);
2529                         goto err;
2530                         }
2531
2532                 if (n != (long)(enc_ticket.length + authenticator.length +
2533                                                 enc_pms.length + 6))
2534                         {
2535                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2536                                 SSL_R_DATA_LENGTH_TOO_LONG);
2537                         goto err;
2538                         }
2539
2540                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2541                                         &kssl_err)) != 0)
2542                         {
2543 #ifdef KSSL_DEBUG
2544                         printf("kssl_sget_tkt rtn %d [%d]\n",
2545                                 krb5rc, kssl_err.reason);
2546                         if (kssl_err.text)
2547                                 printf("kssl_err text= %s\n", kssl_err.text);
2548 #endif  /* KSSL_DEBUG */
2549                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2550                                 kssl_err.reason);
2551                         goto err;
2552                         }
2553
2554                 /*  Note: no authenticator is not considered an error,
2555                 **  but will return authtime == 0.
2556                 */
2557                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2558                                         &authtime, &kssl_err)) != 0)
2559                         {
2560 #ifdef KSSL_DEBUG
2561                         printf("kssl_check_authent rtn %d [%d]\n",
2562                                 krb5rc, kssl_err.reason);
2563                         if (kssl_err.text)
2564                                 printf("kssl_err text= %s\n", kssl_err.text);
2565 #endif  /* KSSL_DEBUG */
2566                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2567                                 kssl_err.reason);
2568                         goto err;
2569                         }
2570
2571                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2572                         {
2573                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2574                         goto err;
2575                         }
2576
2577 #ifdef KSSL_DEBUG
2578                 kssl_ctx_show(kssl_ctx);
2579 #endif  /* KSSL_DEBUG */
2580
2581                 enc = kssl_map_enc(kssl_ctx->enctype);
2582                 if (enc == NULL)
2583                     goto err;
2584
2585                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2586
2587                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2588                         {
2589                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2590                                 SSL_R_DECRYPTION_FAILED);
2591                         goto err;
2592                         }
2593                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2594                                         (unsigned char *)enc_pms.data, enc_pms.length))
2595                         {
2596                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2597                                 SSL_R_DECRYPTION_FAILED);
2598                         goto err;
2599                         }
2600                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2601                         {
2602                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2603                                 SSL_R_DATA_LENGTH_TOO_LONG);
2604                         goto err;
2605                         }
2606                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2607                         {
2608                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2609                                 SSL_R_DECRYPTION_FAILED);
2610                         goto err;
2611                         }
2612                 outl += padl;
2613                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2614                         {
2615                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2616                                 SSL_R_DATA_LENGTH_TOO_LONG);
2617                         goto err;
2618                         }
2619                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2620                     {
2621                     /* The premaster secret must contain the same version number as the
2622                      * ClientHello to detect version rollback attacks (strangely, the
2623                      * protocol does not offer such protection for DH ciphersuites).
2624                      * However, buggy clients exist that send random bytes instead of
2625                      * the protocol version.
2626                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2627                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2628                      */
2629                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2630                         {
2631                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2632                                SSL_AD_DECODE_ERROR);
2633                         goto err;
2634                         }
2635                     }
2636
2637                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2638
2639                 s->session->master_key_length=
2640                         s->method->ssl3_enc->generate_master_secret(s,
2641                                 s->session->master_key, pms, outl);
2642
2643                 if (kssl_ctx->client_princ)
2644                         {
2645                         size_t len = strlen(kssl_ctx->client_princ);
2646                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2647                                 {
2648                                 s->session->krb5_client_princ_len = len;
2649                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2650                                 }
2651                         }
2652
2653
2654                 /*  Was doing kssl_ctx_free() here,
2655                 **  but it caused problems for apache.
2656                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2657                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2658                 */
2659                 }
2660         else
2661 #endif  /* OPENSSL_NO_KRB5 */
2662
2663 #ifndef OPENSSL_NO_ECDH
2664                 if (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe))
2665                 {
2666                 int ret = 1;
2667                 int field_size = 0;
2668                 const EC_KEY   *tkey;
2669                 const EC_GROUP *group;
2670                 const BIGNUM *priv_key;
2671
2672                 /* initialize structures for server's ECDH key pair */
2673                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2674                         {
2675                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2676                             ERR_R_MALLOC_FAILURE);
2677                         goto err;
2678                         }
2679
2680                 /* Let's get server private key and group information */
2681                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2682                         { 
2683                         /* use the certificate */
2684                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2685                         }
2686                 else
2687                         {
2688                         /* use the ephermeral values we saved when
2689                          * generating the ServerKeyExchange msg.
2690                          */
2691                         tkey = s->s3->tmp.ecdh;
2692                         }
2693
2694                 group    = EC_KEY_get0_group(tkey);
2695                 priv_key = EC_KEY_get0_private_key(tkey);
2696
2697                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2698                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2699                         {
2700                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2701                                ERR_R_EC_LIB);
2702                         goto err;
2703                         }
2704
2705                 /* Let's get client's public key */
2706                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2707                         {
2708                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2709                             ERR_R_MALLOC_FAILURE);
2710                         goto err;
2711                         }
2712
2713                 if (n == 0L) 
2714                         {
2715                         /* Client Publickey was in Client Certificate */
2716
2717                          if (alg_k & SSL_kECDHE)
2718                                  {
2719                                  al=SSL_AD_HANDSHAKE_FAILURE;
2720                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2721                                  goto f_err;
2722                                  }
2723                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2724                             == NULL) || 
2725                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2726                                 {
2727                                 /* XXX: For now, we do not support client
2728                                  * authentication using ECDH certificates
2729                                  * so this branch (n == 0L) of the code is
2730                                  * never executed. When that support is
2731                                  * added, we ought to ensure the key 
2732                                  * received in the certificate is 
2733                                  * authorized for key agreement.
2734                                  * ECDH_compute_key implicitly checks that
2735                                  * the two ECDH shares are for the same
2736                                  * group.
2737                                  */
2738                                 al=SSL_AD_HANDSHAKE_FAILURE;
2739                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2740                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2741                                 goto f_err;
2742                                 }
2743
2744                         if (EC_POINT_copy(clnt_ecpoint,
2745                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2746                                 {
2747                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2748                                         ERR_R_EC_LIB);
2749                                 goto err;
2750                                 }
2751                         ret = 2; /* Skip certificate verify processing */
2752                         }
2753                 else
2754                         {
2755                         /* Get client's public key from encoded point
2756                          * in the ClientKeyExchange message.
2757                          */
2758                         if ((bn_ctx = BN_CTX_new()) == NULL)
2759                                 {
2760                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2761                                     ERR_R_MALLOC_FAILURE);
2762                                 goto err;
2763                                 }
2764
2765                         /* Get encoded point length */
2766                         i = *p; 
2767                         p += 1;
2768                         if (n != 1 + i)
2769                                 {
2770                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2771                                     ERR_R_EC_LIB);
2772                                 goto err;
2773                                 }
2774                         if (EC_POINT_oct2point(group, 
2775                             clnt_ecpoint, p, i, bn_ctx) == 0)
2776                                 {
2777                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2778                                     ERR_R_EC_LIB);
2779                                 goto err;
2780                                 }
2781                         /* p is pointing to somewhere in the buffer
2782                          * currently, so set it to the start 
2783                          */ 
2784                         p=(unsigned char *)s->init_buf->data;
2785                         }
2786
2787                 /* Compute the shared pre-master secret */
2788                 field_size = EC_GROUP_get_degree(group);
2789                 if (field_size <= 0)
2790                         {
2791                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2792                                ERR_R_ECDH_LIB);
2793                         goto err;
2794                         }
2795                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2796                 if (i <= 0)
2797                         {
2798                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2799                             ERR_R_ECDH_LIB);
2800                         goto err;
2801                         }
2802
2803                 EVP_PKEY_free(clnt_pub_pkey);
2804                 EC_POINT_free(clnt_ecpoint);
2805                 EC_KEY_free(srvr_ecdh);
2806                 BN_CTX_free(bn_ctx);
2807                 EC_KEY_free(s->s3->tmp.ecdh);
2808                 s->s3->tmp.ecdh = NULL; 
2809
2810                 /* Compute the master secret */
2811                 s->session->master_key_length = s->method->ssl3_enc-> \
2812                     generate_master_secret(s, s->session->master_key, p, i);
2813                 
2814                 OPENSSL_cleanse(p, i);
2815                 return (ret);
2816                 }
2817         else
2818 #endif
2819 #ifndef OPENSSL_NO_PSK
2820                 if (alg_k & SSL_kPSK)
2821                         {
2822                         unsigned char *t = NULL;
2823                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2824                         unsigned int pre_ms_len = 0, psk_len = 0;
2825                         int psk_err = 1;
2826                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2827
2828                         al=SSL_AD_HANDSHAKE_FAILURE;
2829
2830                         n2s(p,i);
2831                         if (n != i+2)
2832                                 {
2833                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2834                                         SSL_R_LENGTH_MISMATCH);
2835                                 goto psk_err;
2836                                 }
2837                         if (i > PSK_MAX_IDENTITY_LEN)
2838                                 {
2839                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2840                                         SSL_R_DATA_LENGTH_TOO_LONG);
2841                                 goto psk_err;
2842                                 }
2843                         if (s->psk_server_callback == NULL)
2844                                 {
2845                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2846                                        SSL_R_PSK_NO_SERVER_CB);
2847                                 goto psk_err;
2848                                 }
2849
2850                         /* Create guaranteed NULL-terminated identity
2851                          * string for the callback */
2852                         memcpy(tmp_id, p, i);
2853                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2854                         psk_len = s->psk_server_callback(s, tmp_id,
2855                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2856                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2857
2858                         if (psk_len > PSK_MAX_PSK_LEN)
2859                                 {
2860                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2861                                         ERR_R_INTERNAL_ERROR);
2862                                 goto psk_err;
2863                                 }
2864                         else if (psk_len == 0)
2865                                 {
2866                                 /* PSK related to the given identity not found */
2867                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2868                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2869                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2870                                 goto psk_err;
2871                                 }
2872
2873                         /* create PSK pre_master_secret */
2874                         pre_ms_len=2+psk_len+2+psk_len;
2875                         t = psk_or_pre_ms;
2876                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2877                         s2n(psk_len, t);
2878                         memset(t, 0, psk_len);
2879                         t+=psk_len;
2880                         s2n(psk_len, t);
2881
2882                         if (s->session->psk_identity != NULL)
2883                                 OPENSSL_free(s->session->psk_identity);
2884                         s->session->psk_identity = BUF_strdup((char *)p);
2885                         if (s->session->psk_identity == NULL)
2886                                 {
2887                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2888                                         ERR_R_MALLOC_FAILURE);
2889                                 goto psk_err;
2890                                 }
2891
2892                         if (s->session->psk_identity_hint != NULL)
2893                                 OPENSSL_free(s->session->psk_identity_hint);
2894                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2895                         if (s->ctx->psk_identity_hint != NULL &&
2896                                 s->session->psk_identity_hint == NULL)
2897                                 {
2898                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2899                                         ERR_R_MALLOC_FAILURE);
2900                                 goto psk_err;
2901                                 }
2902
2903                         s->session->master_key_length=
2904                                 s->method->ssl3_enc->generate_master_secret(s,
2905                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2906                         psk_err = 0;
2907                 psk_err:
2908                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2909                         if (psk_err != 0)
2910                                 goto f_err;
2911                         }
2912                 else
2913 #endif
2914 #ifndef OPENSSL_NO_SRP
2915                 if (alg_k & SSL_kSRP)
2916                         {
2917                         int param_len;
2918
2919                         n2s(p,i);
2920                         param_len=i+2;
2921                         if (param_len > n)
2922                                 {
2923                                 al=SSL_AD_DECODE_ERROR;
2924                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2925                                 goto f_err;
2926                                 }
2927                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2928                                 {
2929                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2930                                 goto err;
2931                                 }
2932                         if (s->session->srp_username != NULL)
2933                                 OPENSSL_free(s->session->srp_username);
2934                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2935                         if (s->session->srp_username == NULL)
2936                                 {
2937                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2938                                         ERR_R_MALLOC_FAILURE);
2939                                 goto err;
2940                                 }
2941
2942                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2943                                 {
2944                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2945                                 goto err;
2946                                 }
2947
2948                         p+=i;
2949                         }
2950                 else
2951 #endif  /* OPENSSL_NO_SRP */
2952                 if (alg_k & SSL_kGOST) 
2953                         {
2954                         int ret = 0;
2955                         EVP_PKEY_CTX *pkey_ctx;
2956                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2957                         unsigned char premaster_secret[32], *start;
2958                         size_t outlen=32, inlen;
2959                         unsigned long alg_a;
2960                         int Ttag, Tclass;
2961                         long Tlen;
2962
2963                         /* Get our certificate private key*/
2964                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2965                         if (alg_a & SSL_aGOST94)
2966                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2967                         else if (alg_a & SSL_aGOST01)
2968                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2969
2970                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2971                         EVP_PKEY_decrypt_init(pkey_ctx);
2972                         /* If client certificate is present and is of the same type, maybe
2973                          * use it for key exchange.  Don't mind errors from
2974                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2975                          * a client certificate for authorization only. */
2976                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2977                         if (client_pub_pkey)
2978                                 {
2979                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2980                                         ERR_clear_error();
2981                                 }
2982                         /* Decrypt session key */
2983                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED || 
2984                                 Ttag != V_ASN1_SEQUENCE ||
2985                                 Tclass != V_ASN1_UNIVERSAL) 
2986                                 {
2987                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2988                                 goto gerr;
2989                                 }
2990                         start = p;
2991                         inlen = Tlen;
2992                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2993
2994                                 {
2995                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2996                                 goto gerr;
2997                                 }
2998                         /* Generate master secret */
2999                         s->session->master_key_length=
3000                                 s->method->ssl3_enc->generate_master_secret(s,
3001                                         s->session->master_key,premaster_secret,32);
3002                         /* Check if pubkey from client certificate was used */
3003                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
3004                                 ret = 2;
3005                         else
3006                                 ret = 1;
3007                 gerr:
3008                         EVP_PKEY_free(client_pub_pkey);
3009                         EVP_PKEY_CTX_free(pkey_ctx);
3010                         if (ret)
3011                                 return ret;
3012                         else
3013                                 goto err;
3014                         }
3015                 else
3016                 {
3017                 al=SSL_AD_HANDSHAKE_FAILURE;
3018                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
3019                                 SSL_R_UNKNOWN_CIPHER_TYPE);
3020                 goto f_err;
3021                 }
3022
3023         return(1);
3024 f_err:
3025         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3026 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
3027 err:
3028 #endif
3029 #ifndef OPENSSL_NO_ECDH
3030         EVP_PKEY_free(clnt_pub_pkey);
3031         EC_POINT_free(clnt_ecpoint);
3032         if (srvr_ecdh != NULL) 
3033                 EC_KEY_free(srvr_ecdh);
3034         BN_CTX_free(bn_ctx);
3035 #endif
3036         return(-1);
3037         }
3038
3039 int ssl3_get_cert_verify(SSL *s)
3040         {
3041         EVP_PKEY *pkey=NULL;
3042         unsigned char *p;
3043         int al,ok,ret=0;
3044         long n;
3045         int type=0,i,j;
3046         X509 *peer;
3047         const EVP_MD *md = NULL;
3048         EVP_MD_CTX mctx;
3049         EVP_MD_CTX_init(&mctx);
3050
3051         n=s->method->ssl_get_message(s,
3052                 SSL3_ST_SR_CERT_VRFY_A,
3053                 SSL3_ST_SR_CERT_VRFY_B,
3054                 -1,
3055                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
3056                 &ok);
3057
3058         if (!ok) return((int)n);
3059
3060         if (s->session->peer != NULL)
3061                 {
3062                 peer=s->session->peer;
3063                 pkey=X509_get_pubkey(peer);
3064                 type=X509_certificate_type(peer,pkey);
3065                 }
3066         else
3067                 {
3068                 peer=NULL;
3069                 pkey=NULL;
3070                 }
3071
3072         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3073                 {
3074                 s->s3->tmp.reuse_message=1;
3075                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3076                         {
3077                         al=SSL_AD_UNEXPECTED_MESSAGE;
3078                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3079                         goto f_err;
3080                         }
3081                 ret=1;
3082                 goto end;
3083                 }
3084
3085         if (peer == NULL)
3086                 {
3087                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3088                 al=SSL_AD_UNEXPECTED_MESSAGE;
3089                 goto f_err;
3090                 }
3091
3092         if (!(type & EVP_PKT_SIGN))
3093                 {
3094                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3095                 al=SSL_AD_ILLEGAL_PARAMETER;
3096                 goto f_err;
3097                 }
3098
3099         if (s->s3->change_cipher_spec)
3100                 {
3101                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3102                 al=SSL_AD_UNEXPECTED_MESSAGE;
3103                 goto f_err;
3104                 }
3105
3106         /* we now have a signature that we need to verify */
3107         p=(unsigned char *)s->init_msg;
3108         /* Check for broken implementations of GOST ciphersuites */
3109         /* If key is GOST and n is exactly 64, it is bare
3110          * signature without length field */
3111         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3112                 pkey->type == NID_id_GostR3410_2001) )
3113                 {
3114                 i=64;
3115                 } 
3116         else 
3117                 {       
3118                 if (SSL_USE_SIGALGS(s))
3119                         {
3120                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
3121                         if (rv == -1)
3122                                 {
3123                                 al = SSL_AD_INTERNAL_ERROR;
3124                                 goto f_err;
3125                                 }
3126                         else if (rv == 0)
3127                                 {
3128                                 al = SSL_AD_DECODE_ERROR;
3129                                 goto f_err;
3130                                 }
3131 #ifdef SSL_DEBUG
3132 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3133 #endif
3134                         p += 2;
3135                         n -= 2;
3136                         }
3137                 n2s(p,i);
3138                 n-=2;
3139                 if (i > n)
3140                         {
3141                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3142                         al=SSL_AD_DECODE_ERROR;
3143                         goto f_err;
3144                         }
3145         }
3146         j=EVP_PKEY_size(pkey);
3147         if ((i > j) || (n > j) || (n <= 0))
3148                 {
3149                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3150                 al=SSL_AD_DECODE_ERROR;
3151                 goto f_err;
3152                 }
3153
3154         if (SSL_USE_SIGALGS(s))
3155                 {
3156                 long hdatalen = 0;
3157                 void *hdata;
3158                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3159                 if (hdatalen <= 0)
3160                         {
3161                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3162                         al=SSL_AD_INTERNAL_ERROR;
3163                         goto f_err;
3164                         }
3165 #ifdef SSL_DEBUG
3166                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3167                                                         EVP_MD_name(md));
3168 #endif
3169                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3170                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3171                         {
3172                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3173                         al=SSL_AD_INTERNAL_ERROR;
3174                         goto f_err;
3175                         }
3176
3177                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3178                         {
3179                         al=SSL_AD_DECRYPT_ERROR;
3180                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3181                         goto f_err;
3182                         }
3183                 }
3184         else
3185 #ifndef OPENSSL_NO_RSA 
3186         if (pkey->type == EVP_PKEY_RSA)
3187                 {
3188                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3189                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
3190                                                         pkey->pkey.rsa);
3191                 if (i < 0)
3192                         {
3193                         al=SSL_AD_DECRYPT_ERROR;
3194                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3195                         goto f_err;
3196                         }
3197                 if (i == 0)
3198                         {
3199                         al=SSL_AD_DECRYPT_ERROR;
3200                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3201                         goto f_err;
3202                         }
3203                 }
3204         else
3205 #endif
3206 #ifndef OPENSSL_NO_DSA
3207                 if (pkey->type == EVP_PKEY_DSA)
3208                 {
3209                 j=DSA_verify(pkey->save_type,
3210                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3211                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3212                 if (j <= 0)
3213                         {
3214                         /* bad signature */
3215                         al=SSL_AD_DECRYPT_ERROR;
3216                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3217                         goto f_err;
3218                         }
3219                 }
3220         else
3221 #endif
3222 #ifndef OPENSSL_NO_ECDSA
3223                 if (pkey->type == EVP_PKEY_EC)
3224                 {
3225                 j=ECDSA_verify(pkey->save_type,
3226                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3227                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3228                 if (j <= 0)
3229                         {
3230                         /* bad signature */
3231                         al=SSL_AD_DECRYPT_ERROR;
3232                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3233                             SSL_R_BAD_ECDSA_SIGNATURE);
3234                         goto f_err;
3235                         }
3236                 }
3237         else
3238 #endif
3239         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3240                 {   unsigned char signature[64];
3241                         int idx;
3242                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3243                         EVP_PKEY_verify_init(pctx);
3244                         if (i!=64) {
3245                                 fprintf(stderr,"GOST signature length is %d",i);
3246                         }       
3247                         for (idx=0;idx<64;idx++) {
3248                                 signature[63-idx]=p[idx];
3249                         }       
3250                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3251                         EVP_PKEY_CTX_free(pctx);
3252                         if (j<=0) 
3253                                 {
3254                                 al=SSL_AD_DECRYPT_ERROR;
3255                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3256                                         SSL_R_BAD_ECDSA_SIGNATURE);
3257                                 goto f_err;
3258                                 }       
3259                 }
3260         else    
3261                 {
3262                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3263                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3264                 goto f_err;
3265                 }
3266
3267
3268         ret=1;
3269         if (0)
3270                 {
3271 f_err:
3272                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3273                 }
3274 end:
3275         if (s->s3->handshake_buffer)
3276                 {
3277                 BIO_free(s->s3->handshake_buffer);
3278                 s->s3->handshake_buffer = NULL;
3279                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3280                 }
3281         EVP_MD_CTX_cleanup(&mctx);
3282         EVP_PKEY_free(pkey);
3283         return(ret);
3284         }
3285
3286 int ssl3_get_client_certificate(SSL *s)
3287         {
3288         int i,ok,al,ret= -1;
3289         X509 *x=NULL;
3290         unsigned long l,nc,llen,n;
3291         const unsigned char *p,*q;
3292         unsigned char *d;
3293         STACK_OF(X509) *sk=NULL;
3294
3295         n=s->method->ssl_get_message(s,
3296                 SSL3_ST_SR_CERT_A,
3297                 SSL3_ST_SR_CERT_B,
3298                 -1,
3299                 s->max_cert_list,
3300                 &ok);
3301
3302         if (!ok) return((int)n);
3303
3304         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3305                 {
3306                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3307                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3308                         {
3309                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3310                         al=SSL_AD_HANDSHAKE_FAILURE;
3311                         goto f_err;
3312                         }
3313                 /* If tls asked for a client cert, the client must return a 0 list */
3314                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3315                         {
3316                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3317                         al=SSL_AD_UNEXPECTED_MESSAGE;
3318                         goto f_err;
3319                         }
3320                 s->s3->tmp.reuse_message=1;
3321                 return(1);
3322                 }
3323
3324         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3325                 {
3326                 al=SSL_AD_UNEXPECTED_MESSAGE;
3327                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3328                 goto f_err;
3329                 }
3330         p=d=(unsigned char *)s->init_msg;
3331
3332         if ((sk=sk_X509_new_null()) == NULL)
3333                 {
3334                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3335                 goto err;
3336                 }
3337
3338         n2l3(p,llen);
3339         if (llen+3 != n)
3340                 {
3341                 al=SSL_AD_DECODE_ERROR;
3342                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3343                 goto f_err;
3344                 }
3345         for (nc=0; nc<llen; )
3346                 {
3347                 n2l3(p,l);
3348                 if ((l+nc+3) > llen)
3349                         {
3350                         al=SSL_AD_DECODE_ERROR;
3351                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3352                         goto f_err;
3353                         }
3354
3355                 q=p;
3356                 x=d2i_X509(NULL,&p,l);
3357                 if (x == NULL)
3358                         {
3359                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3360                         goto err;
3361                         }
3362                 if (p != (q+l))
3363                         {
3364                         al=SSL_AD_DECODE_ERROR;
3365                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3366                         goto f_err;
3367                         }
3368                 if (!sk_X509_push(sk,x))
3369                         {
3370                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3371                         goto err;
3372                         }
3373                 x=NULL;
3374                 nc+=l+3;
3375                 }
3376
3377         if (sk_X509_num(sk) <= 0)
3378                 {
3379                 /* TLS does not mind 0 certs returned */
3380                 if (s->version == SSL3_VERSION)
3381                         {
3382                         al=SSL_AD_HANDSHAKE_FAILURE;
3383                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3384                         goto f_err;
3385                         }
3386                 /* Fail for TLS only if we required a certificate */
3387                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3388                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3389                         {
3390                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3391                         al=SSL_AD_HANDSHAKE_FAILURE;
3392                         goto f_err;
3393                         }
3394                 /* No client certificate so digest cached records */
3395                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3396                         {
3397                         al=SSL_AD_INTERNAL_ERROR;
3398                         goto f_err;
3399                         }
3400                 }
3401         else
3402                 {
3403                 EVP_PKEY *pkey;
3404                 i=ssl_verify_cert_chain(s,sk);
3405                 if (i <= 0)
3406                         {
3407                         al=ssl_verify_alarm_type(s->verify_result);
3408                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
3409                         goto f_err;
3410                         }
3411                 if (i > 1)
3412                         {
3413                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, i);
3414                         al = SSL_AD_HANDSHAKE_FAILURE;
3415                         goto f_err;
3416                         }
3417                 pkey = X509_get_pubkey(sk_X509_value(sk, 0));
3418