PR: 2326
[openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_clnt.c */
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 #include <stdio.h>
152 #include <openssl/crypto.h>
153 #include "ssl_locl.h"
154 #include "kssl_lcl.h"
155 #include <openssl/buffer.h>
156 #include <openssl/rand.h>
157 #include <openssl/objects.h>
158 #include <openssl/evp.h>
159 #include <openssl/md5.h>
160 #ifdef OPENSSL_FIPS
161 #include <openssl/fips.h>
162 #endif
163 #ifndef OPENSSL_NO_DH
164 #include <openssl/dh.h>
165 #endif
166 #include <openssl/bn.h>
167 #ifndef OPENSSL_NO_ENGINE
168 #include <openssl/engine.h>
169 #endif
170
171 static const SSL_METHOD *ssl3_get_client_method(int ver);
172 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
173
174 static const SSL_METHOD *ssl3_get_client_method(int ver)
175         {
176         if (ver == SSL3_VERSION)
177                 return(SSLv3_client_method());
178         else
179                 return(NULL);
180         }
181
182 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
183                         ssl_undefined_function,
184                         ssl3_connect,
185                         ssl3_get_client_method)
186
187 int ssl3_connect(SSL *s)
188         {
189         BUF_MEM *buf=NULL;
190         unsigned long Time=(unsigned long)time(NULL);
191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
192         int ret= -1;
193         int new_state,state,skip=0;
194
195         RAND_add(&Time,sizeof(Time),0);
196         ERR_clear_error();
197         clear_sys_error();
198
199         if (s->info_callback != NULL)
200                 cb=s->info_callback;
201         else if (s->ctx->info_callback != NULL)
202                 cb=s->ctx->info_callback;
203         
204         s->in_handshake++;
205         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
206
207         for (;;)
208                 {
209                 state=s->state;
210
211                 switch(s->state)
212                         {
213                 case SSL_ST_RENEGOTIATE:
214                         s->renegotiate=1;
215                         s->state=SSL_ST_CONNECT;
216                         s->ctx->stats.sess_connect_renegotiate++;
217                         /* break */
218                 case SSL_ST_BEFORE:
219                 case SSL_ST_CONNECT:
220                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
221                 case SSL_ST_OK|SSL_ST_CONNECT:
222
223                         s->server=0;
224                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
225
226                         if ((s->version & 0xff00 ) != 0x0300)
227                                 {
228                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
229                                 ret = -1;
230                                 goto end;
231                                 }
232                                 
233                         /* s->version=SSL3_VERSION; */
234                         s->type=SSL_ST_CONNECT;
235
236                         if (s->init_buf == NULL)
237                                 {
238                                 if ((buf=BUF_MEM_new()) == NULL)
239                                         {
240                                         ret= -1;
241                                         goto end;
242                                         }
243                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
244                                         {
245                                         ret= -1;
246                                         goto end;
247                                         }
248                                 s->init_buf=buf;
249                                 buf=NULL;
250                                 }
251
252                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
253
254                         /* setup buffing BIO */
255                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
256
257                         /* don't push the buffering BIO quite yet */
258
259                         ssl3_init_finished_mac(s);
260
261                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
262                         s->ctx->stats.sess_connect++;
263                         s->init_num=0;
264                         break;
265
266                 case SSL3_ST_CW_CLNT_HELLO_A:
267                 case SSL3_ST_CW_CLNT_HELLO_B:
268
269                         s->shutdown=0;
270                         ret=ssl3_client_hello(s);
271                         if (ret <= 0) goto end;
272                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
273                         s->init_num=0;
274
275                         /* turn on buffering for the next lot of output */
276                         if (s->bbio != s->wbio)
277                                 s->wbio=BIO_push(s->bbio,s->wbio);
278
279                         break;
280
281                 case SSL3_ST_CR_SRVR_HELLO_A:
282                 case SSL3_ST_CR_SRVR_HELLO_B:
283                         ret=ssl3_get_server_hello(s);
284                         if (ret <= 0) goto end;
285
286                         if (s->hit)
287                                 {
288                                 s->state=SSL3_ST_CR_FINISHED_A;
289 #ifndef OPENSSL_NO_TLSEXT
290                                 if (s->tlsext_ticket_expected)
291                                         {
292                                         /* receive renewed session ticket */
293                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
294                                         }
295 #endif
296                                 }
297                         else
298                                 s->state=SSL3_ST_CR_CERT_A;
299                         s->init_num=0;
300                         break;
301
302                 case SSL3_ST_CR_CERT_A:
303                 case SSL3_ST_CR_CERT_B:
304 #ifndef OPENSSL_NO_TLSEXT
305                         ret=ssl3_check_finished(s);
306                         if (ret <= 0) goto end;
307                         if (ret == 2)
308                                 {
309                                 s->hit = 1;
310                                 if (s->tlsext_ticket_expected)
311                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
312                                 else
313                                         s->state=SSL3_ST_CR_FINISHED_A;
314                                 s->init_num=0;
315                                 break;
316                                 }
317 #endif
318                         /* Check if it is anon DH/ECDH */
319                         /* or PSK */
320                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
321                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
322                                 {
323                                 ret=ssl3_get_server_certificate(s);
324                                 if (ret <= 0) goto end;
325 #ifndef OPENSSL_NO_TLSEXT
326                                 if (s->tlsext_status_expected)
327                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
328                                 else
329                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
330                                 }
331                         else
332                                 {
333                                 skip = 1;
334                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
335                                 }
336 #else
337                                 }
338                         else
339                                 skip=1;
340
341                         s->state=SSL3_ST_CR_KEY_EXCH_A;
342 #endif
343                         s->init_num=0;
344                         break;
345
346                 case SSL3_ST_CR_KEY_EXCH_A:
347                 case SSL3_ST_CR_KEY_EXCH_B:
348                         ret=ssl3_get_key_exchange(s);
349                         if (ret <= 0) goto end;
350                         s->state=SSL3_ST_CR_CERT_REQ_A;
351                         s->init_num=0;
352
353                         /* at this point we check that we have the
354                          * required stuff from the server */
355                         if (!ssl3_check_cert_and_algorithm(s))
356                                 {
357                                 ret= -1;
358                                 goto end;
359                                 }
360                         break;
361
362                 case SSL3_ST_CR_CERT_REQ_A:
363                 case SSL3_ST_CR_CERT_REQ_B:
364                         ret=ssl3_get_certificate_request(s);
365                         if (ret <= 0) goto end;
366                         s->state=SSL3_ST_CR_SRVR_DONE_A;
367                         s->init_num=0;
368                         break;
369
370                 case SSL3_ST_CR_SRVR_DONE_A:
371                 case SSL3_ST_CR_SRVR_DONE_B:
372                         ret=ssl3_get_server_done(s);
373                         if (ret <= 0) goto end;
374 #ifndef OPENSSL_NO_SRP
375                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
376                                 {
377                                 if ((ret = SRP_Calc_A_param(s))<=0)
378                                         {
379                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
380                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
381                                         goto end;
382                                         }
383                                 }
384 #endif
385                         if (s->s3->tmp.cert_req)
386                                 s->state=SSL3_ST_CW_CERT_A;
387                         else
388                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
389                         s->init_num=0;
390
391                         break;
392
393                 case SSL3_ST_CW_CERT_A:
394                 case SSL3_ST_CW_CERT_B:
395                 case SSL3_ST_CW_CERT_C:
396                 case SSL3_ST_CW_CERT_D:
397                         ret=ssl3_send_client_certificate(s);
398                         if (ret <= 0) goto end;
399                         s->state=SSL3_ST_CW_KEY_EXCH_A;
400                         s->init_num=0;
401                         break;
402
403                 case SSL3_ST_CW_KEY_EXCH_A:
404                 case SSL3_ST_CW_KEY_EXCH_B:
405                         ret=ssl3_send_client_key_exchange(s);
406                         if (ret <= 0) goto end;
407                         /* EAY EAY EAY need to check for DH fix cert
408                          * sent back */
409                         /* For TLS, cert_req is set to 2, so a cert chain
410                          * of nothing is sent, but no verify packet is sent */
411                         /* XXX: For now, we do not support client 
412                          * authentication in ECDH cipher suites with
413                          * ECDH (rather than ECDSA) certificates.
414                          * We need to skip the certificate verify 
415                          * message when client's ECDH public key is sent 
416                          * inside the client certificate.
417                          */
418                         if (s->s3->tmp.cert_req == 1)
419                                 {
420                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
421                                 }
422                         else
423                                 {
424                                 s->state=SSL3_ST_CW_CHANGE_A;
425                                 s->s3->change_cipher_spec=0;
426                                 }
427                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
428                                 {
429                                 s->state=SSL3_ST_CW_CHANGE_A;
430                                 s->s3->change_cipher_spec=0;
431                                 }
432
433                         s->init_num=0;
434                         break;
435
436                 case SSL3_ST_CW_CERT_VRFY_A:
437                 case SSL3_ST_CW_CERT_VRFY_B:
438                         ret=ssl3_send_client_verify(s);
439                         if (ret <= 0) goto end;
440                         s->state=SSL3_ST_CW_CHANGE_A;
441                         s->init_num=0;
442                         s->s3->change_cipher_spec=0;
443                         break;
444
445                 case SSL3_ST_CW_CHANGE_A:
446                 case SSL3_ST_CW_CHANGE_B:
447                         ret=ssl3_send_change_cipher_spec(s,
448                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
449                         if (ret <= 0) goto end;
450
451 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
452                         s->state=SSL3_ST_CW_FINISHED_A;
453 #else
454                         if (s->s3->next_proto_neg_seen)
455                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
456                         else
457                                 s->state=SSL3_ST_CW_FINISHED_A;
458 #endif
459                         s->init_num=0;
460
461                         s->session->cipher=s->s3->tmp.new_cipher;
462 #ifdef OPENSSL_NO_COMP
463                         s->session->compress_meth=0;
464 #else
465                         if (s->s3->tmp.new_compression == NULL)
466                                 s->session->compress_meth=0;
467                         else
468                                 s->session->compress_meth=
469                                         s->s3->tmp.new_compression->id;
470 #endif
471                         if (!s->method->ssl3_enc->setup_key_block(s))
472                                 {
473                                 ret= -1;
474                                 goto end;
475                                 }
476
477                         if (!s->method->ssl3_enc->change_cipher_state(s,
478                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
479                                 {
480                                 ret= -1;
481                                 goto end;
482                                 }
483
484                         break;
485
486 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
487                 case SSL3_ST_CW_NEXT_PROTO_A:
488                 case SSL3_ST_CW_NEXT_PROTO_B:
489                         ret=ssl3_send_next_proto(s);
490                         if (ret <= 0) goto end;
491                         s->state=SSL3_ST_CW_FINISHED_A;
492                         break;
493 #endif
494
495                 case SSL3_ST_CW_FINISHED_A:
496                 case SSL3_ST_CW_FINISHED_B:
497                         ret=ssl3_send_finished(s,
498                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
499                                 s->method->ssl3_enc->client_finished_label,
500                                 s->method->ssl3_enc->client_finished_label_len);
501                         if (ret <= 0) goto end;
502                         s->state=SSL3_ST_CW_FLUSH;
503
504                         /* clear flags */
505                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
506                         if (s->hit)
507                                 {
508                                 s->s3->tmp.next_state=SSL_ST_OK;
509                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
510                                         {
511                                         s->state=SSL_ST_OK;
512                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
513                                         s->s3->delay_buf_pop_ret=0;
514                                         }
515                                 }
516                         else
517                                 {
518 #ifndef OPENSSL_NO_TLSEXT
519                                 /* Allow NewSessionTicket if ticket expected */
520                                 if (s->tlsext_ticket_expected)
521                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
522                                 else
523 #endif
524                                 
525                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
526                                 }
527                         s->init_num=0;
528                         break;
529
530 #ifndef OPENSSL_NO_TLSEXT
531                 case SSL3_ST_CR_SESSION_TICKET_A:
532                 case SSL3_ST_CR_SESSION_TICKET_B:
533                         ret=ssl3_get_new_session_ticket(s);
534                         if (ret <= 0) goto end;
535                         s->state=SSL3_ST_CR_FINISHED_A;
536                         s->init_num=0;
537                 break;
538
539                 case SSL3_ST_CR_CERT_STATUS_A:
540                 case SSL3_ST_CR_CERT_STATUS_B:
541                         ret=ssl3_get_cert_status(s);
542                         if (ret <= 0) goto end;
543                         s->state=SSL3_ST_CR_KEY_EXCH_A;
544                         s->init_num=0;
545                 break;
546 #endif
547
548                 case SSL3_ST_CR_FINISHED_A:
549                 case SSL3_ST_CR_FINISHED_B:
550
551                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
552                                 SSL3_ST_CR_FINISHED_B);
553                         if (ret <= 0) goto end;
554
555                         if (s->hit)
556                                 s->state=SSL3_ST_CW_CHANGE_A;
557                         else
558                                 s->state=SSL_ST_OK;
559                         s->init_num=0;
560                         break;
561
562                 case SSL3_ST_CW_FLUSH:
563                         s->rwstate=SSL_WRITING;
564                         if (BIO_flush(s->wbio) <= 0)
565                                 {
566                                 ret= -1;
567                                 goto end;
568                                 }
569                         s->rwstate=SSL_NOTHING;
570                         s->state=s->s3->tmp.next_state;
571                         break;
572
573                 case SSL_ST_OK:
574                         /* clean a few things up */
575                         ssl3_cleanup_key_block(s);
576
577                         if (s->init_buf != NULL)
578                                 {
579                                 BUF_MEM_free(s->init_buf);
580                                 s->init_buf=NULL;
581                                 }
582
583                         /* If we are not 'joining' the last two packets,
584                          * remove the buffering now */
585                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
586                                 ssl_free_wbio_buffer(s);
587                         /* else do it later in ssl3_write */
588
589                         s->init_num=0;
590                         s->renegotiate=0;
591                         s->new_session=0;
592
593                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
594                         if (s->hit) s->ctx->stats.sess_hit++;
595
596                         ret=1;
597                         /* s->server=0; */
598                         s->handshake_func=ssl3_connect;
599                         s->ctx->stats.sess_connect_good++;
600
601                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
602
603                         goto end;
604                         /* break; */
605                         
606                 default:
607                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
608                         ret= -1;
609                         goto end;
610                         /* break; */
611                         }
612
613                 /* did we do anything */
614                 if (!s->s3->tmp.reuse_message && !skip)
615                         {
616                         if (s->debug)
617                                 {
618                                 if ((ret=BIO_flush(s->wbio)) <= 0)
619                                         goto end;
620                                 }
621
622                         if ((cb != NULL) && (s->state != state))
623                                 {
624                                 new_state=s->state;
625                                 s->state=state;
626                                 cb(s,SSL_CB_CONNECT_LOOP,1);
627                                 s->state=new_state;
628                                 }
629                         }
630                 skip=0;
631                 }
632 end:
633         s->in_handshake--;
634         if (buf != NULL)
635                 BUF_MEM_free(buf);
636         if (cb != NULL)
637                 cb(s,SSL_CB_CONNECT_EXIT,ret);
638         return(ret);
639         }
640
641
642 int ssl3_client_hello(SSL *s)
643         {
644         unsigned char *buf;
645         unsigned char *p,*d;
646         int i;
647         unsigned long Time,l;
648 #ifndef OPENSSL_NO_COMP
649         int j;
650         SSL_COMP *comp;
651 #endif
652
653         buf=(unsigned char *)s->init_buf->data;
654         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
655                 {
656                 SSL_SESSION *sess = s->session;
657                 if ((sess == NULL) ||
658                         (sess->ssl_version != s->version) ||
659 #ifdef OPENSSL_NO_TLSEXT
660                         !sess->session_id_length ||
661 #else
662                         (!sess->session_id_length && !sess->tlsext_tick) ||
663 #endif
664                         (sess->not_resumable))
665                         {
666                         if (!ssl_get_new_session(s,0))
667                                 goto err;
668                         }
669                 /* else use the pre-loaded session */
670
671                 p=s->s3->client_random;
672                 Time=(unsigned long)time(NULL);                 /* Time */
673                 l2n(Time,p);
674                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
675                         goto err;
676
677                 /* Do the message type and length last */
678                 d=p= &(buf[4]);
679
680                 *(p++)=s->version>>8;
681                 *(p++)=s->version&0xff;
682                 s->client_version=s->version;
683
684                 /* Random stuff */
685                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
686                 p+=SSL3_RANDOM_SIZE;
687
688                 /* Session ID */
689                 if (s->new_session)
690                         i=0;
691                 else
692                         i=s->session->session_id_length;
693                 *(p++)=i;
694                 if (i != 0)
695                         {
696                         if (i > (int)sizeof(s->session->session_id))
697                                 {
698                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
699                                 goto err;
700                                 }
701                         memcpy(p,s->session->session_id,i);
702                         p+=i;
703                         }
704                 
705                 /* Ciphers supported */
706                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
707                 if (i == 0)
708                         {
709                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
710                         goto err;
711                         }
712                 s2n(i,p);
713                 p+=i;
714
715                 /* COMPRESSION */
716 #ifdef OPENSSL_NO_COMP
717                 *(p++)=1;
718 #else
719
720                 if ((s->options & SSL_OP_NO_COMPRESSION)
721                                         || !s->ctx->comp_methods)
722                         j=0;
723                 else
724                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
725                 *(p++)=1+j;
726                 for (i=0; i<j; i++)
727                         {
728                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
729                         *(p++)=comp->id;
730                         }
731 #endif
732                 *(p++)=0; /* Add the NULL method */
733
734 #ifndef OPENSSL_NO_TLSEXT
735                 /* TLS extensions*/
736                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
737                         {
738                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
739                         goto err;
740                         }
741                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
742                         {
743                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
744                         goto err;
745                         }
746 #endif
747                 
748                 l=(p-d);
749                 d=buf;
750                 *(d++)=SSL3_MT_CLIENT_HELLO;
751                 l2n3(l,d);
752
753                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
754                 /* number of bytes to write */
755                 s->init_num=p-buf;
756                 s->init_off=0;
757                 }
758
759         /* SSL3_ST_CW_CLNT_HELLO_B */
760         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
761 err:
762         return(-1);
763         }
764
765 int ssl3_get_server_hello(SSL *s)
766         {
767         STACK_OF(SSL_CIPHER) *sk;
768         const SSL_CIPHER *c;
769         unsigned char *p,*d;
770         int i,al,ok;
771         unsigned int j;
772         long n;
773 #ifndef OPENSSL_NO_COMP
774         SSL_COMP *comp;
775 #endif
776
777         n=s->method->ssl_get_message(s,
778                 SSL3_ST_CR_SRVR_HELLO_A,
779                 SSL3_ST_CR_SRVR_HELLO_B,
780                 -1,
781                 20000, /* ?? */
782                 &ok);
783
784         if (!ok) return((int)n);
785
786         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
787                 {
788                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
789                         {
790                         if ( s->d1->send_cookie == 0)
791                                 {
792                                 s->s3->tmp.reuse_message = 1;
793                                 return 1;
794                                 }
795                         else /* already sent a cookie */
796                                 {
797                                 al=SSL_AD_UNEXPECTED_MESSAGE;
798                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
799                                 goto f_err;
800                                 }
801                         }
802                 }
803         
804         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
805                 {
806                 al=SSL_AD_UNEXPECTED_MESSAGE;
807                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
808                 goto f_err;
809                 }
810
811         d=p=(unsigned char *)s->init_msg;
812
813         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
814                 {
815                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
816                 s->version=(s->version&0xff00)|p[1];
817                 al=SSL_AD_PROTOCOL_VERSION;
818                 goto f_err;
819                 }
820         p+=2;
821
822         /* load the server hello data */
823         /* load the server random */
824         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
825         p+=SSL3_RANDOM_SIZE;
826
827         /* get the session-id */
828         j= *(p++);
829
830         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
831                 {
832                 al=SSL_AD_ILLEGAL_PARAMETER;
833                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
834                 goto f_err;
835                 }
836
837 #ifndef OPENSSL_NO_TLSEXT
838         /* check if we want to resume the session based on external pre-shared secret */
839         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
840                 {
841                 SSL_CIPHER *pref_cipher=NULL;
842                 s->session->master_key_length=sizeof(s->session->master_key);
843                 if (s->tls_session_secret_cb(s, s->session->master_key,
844                                              &s->session->master_key_length,
845                                              NULL, &pref_cipher,
846                                              s->tls_session_secret_cb_arg))
847                         {
848                         s->session->cipher = pref_cipher ?
849                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
850                         }
851                 }
852 #endif /* OPENSSL_NO_TLSEXT */
853
854         if (j != 0 && j == s->session->session_id_length
855             && memcmp(p,s->session->session_id,j) == 0)
856             {
857             if(s->sid_ctx_length != s->session->sid_ctx_length
858                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
859                 {
860                 /* actually a client application bug */
861                 al=SSL_AD_ILLEGAL_PARAMETER;
862                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
863                 goto f_err;
864                 }
865             s->hit=1;
866             }
867         else    /* a miss or crap from the other end */
868                 {
869                 /* If we were trying for session-id reuse, make a new
870                  * SSL_SESSION so we don't stuff up other people */
871                 s->hit=0;
872                 if (s->session->session_id_length > 0)
873                         {
874                         if (!ssl_get_new_session(s,0))
875                                 {
876                                 al=SSL_AD_INTERNAL_ERROR;
877                                 goto f_err;
878                                 }
879                         }
880                 s->session->session_id_length=j;
881                 memcpy(s->session->session_id,p,j); /* j could be 0 */
882                 }
883         p+=j;
884         c=ssl_get_cipher_by_char(s,p);
885         if (c == NULL)
886                 {
887                 /* unknown cipher */
888                 al=SSL_AD_ILLEGAL_PARAMETER;
889                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
890                 goto f_err;
891                 }
892         /* TLS v1.2 only ciphersuites require v1.2 or later */
893         if ((c->algorithm_ssl & SSL_TLSV1_2) && 
894                 (TLS1_get_version(s) < TLS1_2_VERSION))
895                 {
896                 al=SSL_AD_ILLEGAL_PARAMETER;
897                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
898                 goto f_err;
899                 }
900         p+=ssl_put_cipher_by_char(s,NULL,NULL);
901
902         sk=ssl_get_ciphers_by_id(s);
903         i=sk_SSL_CIPHER_find(sk,c);
904         if (i < 0)
905                 {
906                 /* we did not say we would use this cipher */
907                 al=SSL_AD_ILLEGAL_PARAMETER;
908                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
909                 goto f_err;
910                 }
911
912         /* Depending on the session caching (internal/external), the cipher
913            and/or cipher_id values may not be set. Make sure that
914            cipher_id is set and use it for comparison. */
915         if (s->session->cipher)
916                 s->session->cipher_id = s->session->cipher->id;
917         if (s->hit && (s->session->cipher_id != c->id))
918                 {
919 /* Workaround is now obsolete */
920 #if 0
921                 if (!(s->options &
922                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
923 #endif
924                         {
925                         al=SSL_AD_ILLEGAL_PARAMETER;
926                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
927                         goto f_err;
928                         }
929                 }
930         s->s3->tmp.new_cipher=c;
931         /* Don't digest cached records if TLS v1.2: we may need them for
932          * client authentication.
933          */
934         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
935                 goto f_err;
936         /* lets get the compression algorithm */
937         /* COMPRESSION */
938 #ifdef OPENSSL_NO_COMP
939         if (*(p++) != 0)
940                 {
941                 al=SSL_AD_ILLEGAL_PARAMETER;
942                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
943                 goto f_err;
944                 }
945         /* If compression is disabled we'd better not try to resume a session
946          * using compression.
947          */
948         if (s->session->compress_meth != 0)
949                 {
950                 al=SSL_AD_INTERNAL_ERROR;
951                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
952                 goto f_err;
953                 }
954 #else
955         j= *(p++);
956         if (s->hit && j != s->session->compress_meth)
957                 {
958                 al=SSL_AD_ILLEGAL_PARAMETER;
959                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
960                 goto f_err;
961                 }
962         if (j == 0)
963                 comp=NULL;
964         else if (s->options & SSL_OP_NO_COMPRESSION)
965                 {
966                 al=SSL_AD_ILLEGAL_PARAMETER;
967                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
968                 goto f_err;
969                 }
970         else
971                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
972         
973         if ((j != 0) && (comp == NULL))
974                 {
975                 al=SSL_AD_ILLEGAL_PARAMETER;
976                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
977                 goto f_err;
978                 }
979         else
980                 {
981                 s->s3->tmp.new_compression=comp;
982                 }
983 #endif
984
985 #ifndef OPENSSL_NO_TLSEXT
986         /* TLS extensions*/
987         if (s->version >= SSL3_VERSION)
988                 {
989                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
990                         {
991                         /* 'al' set by ssl_parse_serverhello_tlsext */
992                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
993                         goto f_err; 
994                         }
995                 if (ssl_check_serverhello_tlsext(s) <= 0)
996                         {
997                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
998                                 goto err;
999                         }
1000                 }
1001 #endif
1002
1003         if (p != (d+n))
1004                 {
1005                 /* wrong packet length */
1006                 al=SSL_AD_DECODE_ERROR;
1007                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1008                 goto f_err;
1009                 }
1010
1011         return(1);
1012 f_err:
1013         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1014 err:
1015         return(-1);
1016         }
1017
1018 int ssl3_get_server_certificate(SSL *s)
1019         {
1020         int al,i,ok,ret= -1;
1021         unsigned long n,nc,llen,l;
1022         X509 *x=NULL;
1023         const unsigned char *q,*p;
1024         unsigned char *d;
1025         STACK_OF(X509) *sk=NULL;
1026         SESS_CERT *sc;
1027         EVP_PKEY *pkey=NULL;
1028         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1029
1030         n=s->method->ssl_get_message(s,
1031                 SSL3_ST_CR_CERT_A,
1032                 SSL3_ST_CR_CERT_B,
1033                 -1,
1034                 s->max_cert_list,
1035                 &ok);
1036
1037         if (!ok) return((int)n);
1038
1039         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1040                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 
1041                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1042                 {
1043                 s->s3->tmp.reuse_message=1;
1044                 return(1);
1045                 }
1046
1047         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1048                 {
1049                 al=SSL_AD_UNEXPECTED_MESSAGE;
1050                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1051                 goto f_err;
1052                 }
1053         p=d=(unsigned char *)s->init_msg;
1054
1055         if ((sk=sk_X509_new_null()) == NULL)
1056                 {
1057                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1058                 goto err;
1059                 }
1060
1061         n2l3(p,llen);
1062         if (llen+3 != n)
1063                 {
1064                 al=SSL_AD_DECODE_ERROR;
1065                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1066                 goto f_err;
1067                 }
1068         for (nc=0; nc<llen; )
1069                 {
1070                 n2l3(p,l);
1071                 if ((l+nc+3) > llen)
1072                         {
1073                         al=SSL_AD_DECODE_ERROR;
1074                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1075                         goto f_err;
1076                         }
1077
1078                 q=p;
1079                 x=d2i_X509(NULL,&q,l);
1080                 if (x == NULL)
1081                         {
1082                         al=SSL_AD_BAD_CERTIFICATE;
1083                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1084                         goto f_err;
1085                         }
1086                 if (q != (p+l))
1087                         {
1088                         al=SSL_AD_DECODE_ERROR;
1089                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1090                         goto f_err;
1091                         }
1092                 if (!sk_X509_push(sk,x))
1093                         {
1094                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1095                         goto err;
1096                         }
1097                 x=NULL;
1098                 nc+=l+3;
1099                 p=q;
1100                 }
1101
1102         i=ssl_verify_cert_chain(s,sk);
1103         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1104 #ifndef OPENSSL_NO_KRB5
1105             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1106                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1107 #endif /* OPENSSL_NO_KRB5 */
1108                 )
1109                 {
1110                 al=ssl_verify_alarm_type(s->verify_result);
1111                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1112                 goto f_err; 
1113                 }
1114         ERR_clear_error(); /* but we keep s->verify_result */
1115
1116         sc=ssl_sess_cert_new();
1117         if (sc == NULL) goto err;
1118
1119         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1120         s->session->sess_cert=sc;
1121
1122         sc->cert_chain=sk;
1123         /* Inconsistency alert: cert_chain does include the peer's
1124          * certificate, which we don't include in s3_srvr.c */
1125         x=sk_X509_value(sk,0);
1126         sk=NULL;
1127         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1128
1129         pkey=X509_get_pubkey(x);
1130
1131         /* VRS: allow null cert if auth == KRB5 */
1132         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1133                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1134                     ? 0 : 1;
1135
1136 #ifdef KSSL_DEBUG
1137         printf("pkey,x = %p, %p\n", pkey,x);
1138         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1139         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1140                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1141 #endif    /* KSSL_DEBUG */
1142
1143         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1144                 {
1145                 x=NULL;
1146                 al=SSL3_AL_FATAL;
1147                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1148                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1149                 goto f_err;
1150                 }
1151
1152         i=ssl_cert_type(x,pkey);
1153         if (need_cert && i < 0)
1154                 {
1155                 x=NULL;
1156                 al=SSL3_AL_FATAL;
1157                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1158                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1159                 goto f_err;
1160                 }
1161
1162         if (need_cert)
1163                 {
1164                 sc->peer_cert_type=i;
1165                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1166                 /* Why would the following ever happen?
1167                  * We just created sc a couple of lines ago. */
1168                 if (sc->peer_pkeys[i].x509 != NULL)
1169                         X509_free(sc->peer_pkeys[i].x509);
1170                 sc->peer_pkeys[i].x509=x;
1171                 sc->peer_key= &(sc->peer_pkeys[i]);
1172
1173                 if (s->session->peer != NULL)
1174                         X509_free(s->session->peer);
1175                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1176                 s->session->peer=x;
1177                 }
1178         else
1179                 {
1180                 sc->peer_cert_type=i;
1181                 sc->peer_key= NULL;
1182
1183                 if (s->session->peer != NULL)
1184                         X509_free(s->session->peer);
1185                 s->session->peer=NULL;
1186                 }
1187         s->session->verify_result = s->verify_result;
1188
1189         x=NULL;
1190         ret=1;
1191
1192         if (0)
1193                 {
1194 f_err:
1195                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1196                 }
1197 err:
1198         EVP_PKEY_free(pkey);
1199         X509_free(x);
1200         sk_X509_pop_free(sk,X509_free);
1201         return(ret);
1202         }
1203
1204 int ssl3_get_key_exchange(SSL *s)
1205         {
1206 #ifndef OPENSSL_NO_RSA
1207         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1208 #endif
1209         EVP_MD_CTX md_ctx;
1210         unsigned char *param,*p;
1211         int al,i,j,param_len,ok;
1212         long n,alg_k,alg_a;
1213         EVP_PKEY *pkey=NULL;
1214         const EVP_MD *md = NULL;
1215 #ifndef OPENSSL_NO_RSA
1216         RSA *rsa=NULL;
1217 #endif
1218 #ifndef OPENSSL_NO_DH
1219         DH *dh=NULL;
1220 #endif
1221 #ifndef OPENSSL_NO_ECDH
1222         EC_KEY *ecdh = NULL;
1223         BN_CTX *bn_ctx = NULL;
1224         EC_POINT *srvr_ecpoint = NULL;
1225         int curve_nid = 0;
1226         int encoded_pt_len = 0;
1227 #endif
1228
1229         /* use same message size as in ssl3_get_certificate_request()
1230          * as ServerKeyExchange message may be skipped */
1231         n=s->method->ssl_get_message(s,
1232                 SSL3_ST_CR_KEY_EXCH_A,
1233                 SSL3_ST_CR_KEY_EXCH_B,
1234                 -1,
1235                 s->max_cert_list,
1236                 &ok);
1237         if (!ok) return((int)n);
1238
1239         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1240                 {
1241 #ifndef OPENSSL_NO_PSK
1242                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1243                    omitted if no identity hint is sent. Set
1244                    session->sess_cert anyway to avoid problems
1245                    later.*/
1246                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1247                         {
1248                         s->session->sess_cert=ssl_sess_cert_new();
1249                         if (s->ctx->psk_identity_hint)
1250                                 OPENSSL_free(s->ctx->psk_identity_hint);
1251                         s->ctx->psk_identity_hint = NULL;
1252                         }
1253 #endif
1254                 s->s3->tmp.reuse_message=1;
1255                 return(1);
1256                 }
1257
1258         param=p=(unsigned char *)s->init_msg;
1259         if (s->session->sess_cert != NULL)
1260                 {
1261 #ifndef OPENSSL_NO_RSA
1262                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1263                         {
1264                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1265                         s->session->sess_cert->peer_rsa_tmp=NULL;
1266                         }
1267 #endif
1268 #ifndef OPENSSL_NO_DH
1269                 if (s->session->sess_cert->peer_dh_tmp)
1270                         {
1271                         DH_free(s->session->sess_cert->peer_dh_tmp);
1272                         s->session->sess_cert->peer_dh_tmp=NULL;
1273                         }
1274 #endif
1275 #ifndef OPENSSL_NO_ECDH
1276                 if (s->session->sess_cert->peer_ecdh_tmp)
1277                         {
1278                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1279                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1280                         }
1281 #endif
1282                 }
1283         else
1284                 {
1285                 s->session->sess_cert=ssl_sess_cert_new();
1286                 }
1287
1288         param_len=0;
1289         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1290         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1291         EVP_MD_CTX_init(&md_ctx);
1292
1293 #ifndef OPENSSL_NO_PSK
1294         if (alg_k & SSL_kPSK)
1295                 {
1296                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1297
1298                 al=SSL_AD_HANDSHAKE_FAILURE;
1299                 n2s(p,i);
1300                 param_len=i+2;
1301                 /* Store PSK identity hint for later use, hint is used
1302                  * in ssl3_send_client_key_exchange.  Assume that the
1303                  * maximum length of a PSK identity hint can be as
1304                  * long as the maximum length of a PSK identity. */
1305                 if (i > PSK_MAX_IDENTITY_LEN)
1306                         {
1307                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1308                                 SSL_R_DATA_LENGTH_TOO_LONG);
1309                         goto f_err;
1310                         }
1311                 if (param_len > n)
1312                         {
1313                         al=SSL_AD_DECODE_ERROR;
1314                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1315                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1316                         goto f_err;
1317                         }
1318                 /* If received PSK identity hint contains NULL
1319                  * characters, the hint is truncated from the first
1320                  * NULL. p may not be ending with NULL, so create a
1321                  * NULL-terminated string. */
1322                 memcpy(tmp_id_hint, p, i);
1323                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1324                 if (s->ctx->psk_identity_hint != NULL)
1325                         OPENSSL_free(s->ctx->psk_identity_hint);
1326                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1327                 if (s->ctx->psk_identity_hint == NULL)
1328                         {
1329                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1330                         goto f_err;
1331                         }          
1332
1333                 p+=i;
1334                 n-=param_len;
1335                 }
1336         else
1337 #endif /* !OPENSSL_NO_PSK */
1338 #ifndef OPENSSL_NO_SRP
1339         if (alg_k & SSL_kSRP)
1340                 {
1341                 n2s(p,i);
1342                 param_len=i+2;
1343                 if (param_len > n)
1344                         {
1345                         al=SSL_AD_DECODE_ERROR;
1346                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1347                         goto f_err;
1348                         }
1349                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1350                         {
1351                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1352                         goto err;
1353                         }
1354                 p+=i;
1355
1356                 n2s(p,i);
1357                 param_len+=i+2;
1358                 if (param_len > n)
1359                         {
1360                         al=SSL_AD_DECODE_ERROR;
1361                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1362                         goto f_err;
1363                         }
1364                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1365                         {
1366                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1367                         goto err;
1368                         }
1369                 p+=i;
1370
1371                 i = (unsigned int)(p[0]);
1372                 p++;
1373                 param_len+=i+1;
1374                 if (param_len > n)
1375                         {
1376                         al=SSL_AD_DECODE_ERROR;
1377                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1378                         goto f_err;
1379                         }
1380                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1381                         {
1382                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1383                         goto err;
1384                         }
1385                 p+=i;
1386
1387                 n2s(p,i);
1388                 param_len+=i+2;
1389                 if (param_len > n)
1390                         {
1391                         al=SSL_AD_DECODE_ERROR;
1392                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1393                         goto f_err;
1394                         }
1395                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1396                         {
1397                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1398                         goto err;
1399                         }
1400                 p+=i;
1401                 n-=param_len;
1402
1403 /* We must check if there is a certificate */
1404 #ifndef OPENSSL_NO_RSA
1405                 if (alg_a & SSL_aRSA)
1406                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1407 #else
1408                 if (0)
1409                         ;
1410 #endif
1411 #ifndef OPENSSL_NO_DSA
1412                 else if (alg_a & SSL_aDSS)
1413                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1414 #endif
1415                 }
1416         else
1417 #endif /* !OPENSSL_NO_SRP */
1418 #ifndef OPENSSL_NO_RSA
1419         if (alg_k & SSL_kRSA)
1420                 {
1421                 if ((rsa=RSA_new()) == NULL)
1422                         {
1423                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1424                         goto err;
1425                         }
1426                 n2s(p,i);
1427                 param_len=i+2;
1428                 if (param_len > n)
1429                         {
1430                         al=SSL_AD_DECODE_ERROR;
1431                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1432                         goto f_err;
1433                         }
1434                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1435                         {
1436                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1437                         goto err;
1438                         }
1439                 p+=i;
1440
1441                 n2s(p,i);
1442                 param_len+=i+2;
1443                 if (param_len > n)
1444                         {
1445                         al=SSL_AD_DECODE_ERROR;
1446                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1447                         goto f_err;
1448                         }
1449                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1450                         {
1451                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1452                         goto err;
1453                         }
1454                 p+=i;
1455                 n-=param_len;
1456
1457                 /* this should be because we are using an export cipher */
1458                 if (alg_a & SSL_aRSA)
1459                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1460                 else
1461                         {
1462                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1463                         goto err;
1464                         }
1465                 s->session->sess_cert->peer_rsa_tmp=rsa;
1466                 rsa=NULL;
1467                 }
1468 #else /* OPENSSL_NO_RSA */
1469         if (0)
1470                 ;
1471 #endif
1472 #ifndef OPENSSL_NO_DH
1473         else if (alg_k & SSL_kEDH)
1474                 {
1475                 if ((dh=DH_new()) == NULL)
1476                         {
1477                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1478                         goto err;
1479                         }
1480                 n2s(p,i);
1481                 param_len=i+2;
1482                 if (param_len > n)
1483                         {
1484                         al=SSL_AD_DECODE_ERROR;
1485                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1486                         goto f_err;
1487                         }
1488                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1489                         {
1490                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1491                         goto err;
1492                         }
1493                 p+=i;
1494
1495                 n2s(p,i);
1496                 param_len+=i+2;
1497                 if (param_len > n)
1498                         {
1499                         al=SSL_AD_DECODE_ERROR;
1500                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1501                         goto f_err;
1502                         }
1503                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1504                         {
1505                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1506                         goto err;
1507                         }
1508                 p+=i;
1509
1510                 n2s(p,i);
1511                 param_len+=i+2;
1512                 if (param_len > n)
1513                         {
1514                         al=SSL_AD_DECODE_ERROR;
1515                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1516                         goto f_err;
1517                         }
1518                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1519                         {
1520                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1521                         goto err;
1522                         }
1523                 p+=i;
1524                 n-=param_len;
1525
1526 #ifndef OPENSSL_NO_RSA
1527                 if (alg_a & SSL_aRSA)
1528                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1529 #else
1530                 if (0)
1531                         ;
1532 #endif
1533 #ifndef OPENSSL_NO_DSA
1534                 else if (alg_a & SSL_aDSS)
1535                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1536 #endif
1537                 /* else anonymous DH, so no certificate or pkey. */
1538
1539                 s->session->sess_cert->peer_dh_tmp=dh;
1540                 dh=NULL;
1541                 }
1542         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1543                 {
1544                 al=SSL_AD_ILLEGAL_PARAMETER;
1545                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1546                 goto f_err;
1547                 }
1548 #endif /* !OPENSSL_NO_DH */
1549
1550 #ifndef OPENSSL_NO_ECDH
1551         else if (alg_k & SSL_kEECDH)
1552                 {
1553                 EC_GROUP *ngroup;
1554                 const EC_GROUP *group;
1555
1556                 if ((ecdh=EC_KEY_new()) == NULL)
1557                         {
1558                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1559                         goto err;
1560                         }
1561
1562                 /* Extract elliptic curve parameters and the
1563                  * server's ephemeral ECDH public key.
1564                  * Keep accumulating lengths of various components in
1565                  * param_len and make sure it never exceeds n.
1566                  */
1567
1568                 /* XXX: For now we only support named (not generic) curves
1569                  * and the ECParameters in this case is just three bytes.
1570                  */
1571                 param_len=3;
1572                 if ((param_len > n) ||
1573                     (*p != NAMED_CURVE_TYPE) || 
1574                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)) 
1575                         {
1576                         al=SSL_AD_INTERNAL_ERROR;
1577                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1578                         goto f_err;
1579                         }
1580
1581                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1582                 if (ngroup == NULL)
1583                         {
1584                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1585                         goto err;
1586                         }
1587                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1588                         {
1589                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1590                         goto err;
1591                         }
1592                 EC_GROUP_free(ngroup);
1593
1594                 group = EC_KEY_get0_group(ecdh);
1595
1596                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1597                     (EC_GROUP_get_degree(group) > 163))
1598                         {
1599                         al=SSL_AD_EXPORT_RESTRICTION;
1600                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1601                         goto f_err;
1602                         }
1603
1604                 p+=3;
1605
1606                 /* Next, get the encoded ECPoint */
1607                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1608                     ((bn_ctx = BN_CTX_new()) == NULL))
1609                         {
1610                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1611                         goto err;
1612                         }
1613
1614                 encoded_pt_len = *p;  /* length of encoded point */
1615                 p+=1;
1616                 param_len += (1 + encoded_pt_len);
1617                 if ((param_len > n) ||
1618                     (EC_POINT_oct2point(group, srvr_ecpoint, 
1619                         p, encoded_pt_len, bn_ctx) == 0))
1620                         {
1621                         al=SSL_AD_DECODE_ERROR;
1622                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1623                         goto f_err;
1624                         }
1625
1626                 n-=param_len;
1627                 p+=encoded_pt_len;
1628
1629                 /* The ECC/TLS specification does not mention
1630                  * the use of DSA to sign ECParameters in the server
1631                  * key exchange message. We do support RSA and ECDSA.
1632                  */
1633                 if (0) ;
1634 #ifndef OPENSSL_NO_RSA
1635                 else if (alg_a & SSL_aRSA)
1636                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1637 #endif
1638 #ifndef OPENSSL_NO_ECDSA
1639                 else if (alg_a & SSL_aECDSA)
1640                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1641 #endif
1642                 /* else anonymous ECDH, so no certificate or pkey. */
1643                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1644                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1645                 ecdh=NULL;
1646                 BN_CTX_free(bn_ctx);
1647                 bn_ctx = NULL;
1648                 EC_POINT_free(srvr_ecpoint);
1649                 srvr_ecpoint = NULL;
1650                 }
1651         else if (alg_k)
1652                 {
1653                 al=SSL_AD_UNEXPECTED_MESSAGE;
1654                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1655                 goto f_err;
1656                 }
1657 #endif /* !OPENSSL_NO_ECDH */
1658
1659
1660         /* p points to the next byte, there are 'n' bytes left */
1661
1662         /* if it was signed, check the signature */
1663         if (pkey != NULL)
1664                 {
1665                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1666                         {
1667                         int sigalg = tls12_get_sigid(pkey);
1668                         /* Should never happen */
1669                         if (sigalg == -1)
1670                                 {
1671                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1672                                 goto err;
1673                                 }
1674                         /* Check key type is consistent with signature */
1675                         if (sigalg != (int)p[1])
1676                                 {
1677                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1678                                 al=SSL_AD_DECODE_ERROR;
1679                                 goto f_err;
1680                                 }
1681                         md = tls12_get_hash(p[0]);
1682                         if (md == NULL)
1683                                 {
1684                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1685                                 al=SSL_AD_DECODE_ERROR;
1686                                 goto f_err;
1687                                 }
1688 #ifdef SSL_DEBUG
1689 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1690 #endif
1691                         p += 2;
1692                         n -= 2;
1693                         }
1694                 else
1695                         md = EVP_sha1();
1696                         
1697                 n2s(p,i);
1698                 n-=2;
1699                 j=EVP_PKEY_size(pkey);
1700
1701                 if ((i != n) || (n > j) || (n <= 0))
1702                         {
1703                         /* wrong packet length */
1704                         al=SSL_AD_DECODE_ERROR;
1705                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1706                         goto f_err;
1707                         }
1708
1709 #ifndef OPENSSL_NO_RSA
1710                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1711                         {
1712                         int num;
1713
1714                         j=0;
1715                         q=md_buf;
1716                         for (num=2; num > 0; num--)
1717                                 {
1718                                 EVP_MD_CTX_set_flags(&md_ctx,
1719                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1720                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1721                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1722                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1723                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1724                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1725                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1726                                 q+=i;
1727                                 j+=i;
1728                                 }
1729                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1730                                                                 pkey->pkey.rsa);
1731                         if (i < 0)
1732                                 {
1733                                 al=SSL_AD_DECRYPT_ERROR;
1734                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1735                                 goto f_err;
1736                                 }
1737                         if (i == 0)
1738                                 {
1739                                 /* bad signature */
1740                                 al=SSL_AD_DECRYPT_ERROR;
1741                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1742                                 goto f_err;
1743                                 }
1744                         }
1745                 else
1746 #endif
1747                         {
1748                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1749                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1750                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1751                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1752                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1753                                 {
1754                                 /* bad signature */
1755                                 al=SSL_AD_DECRYPT_ERROR;
1756                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1757                                 goto f_err;
1758                                 }
1759                         }
1760                 }
1761         else
1762                 {
1763                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1764                         /* aNULL or kPSK do not need public keys */
1765                         {
1766                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1767                         goto err;
1768                         }
1769                 /* still data left over */
1770                 if (n != 0)
1771                         {
1772                         al=SSL_AD_DECODE_ERROR;
1773                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1774                         goto f_err;
1775                         }
1776                 }
1777         EVP_PKEY_free(pkey);
1778         EVP_MD_CTX_cleanup(&md_ctx);
1779         return(1);
1780 f_err:
1781         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1782 err:
1783         EVP_PKEY_free(pkey);
1784 #ifndef OPENSSL_NO_RSA
1785         if (rsa != NULL)
1786                 RSA_free(rsa);
1787 #endif
1788 #ifndef OPENSSL_NO_DH
1789         if (dh != NULL)
1790                 DH_free(dh);
1791 #endif
1792 #ifndef OPENSSL_NO_ECDH
1793         BN_CTX_free(bn_ctx);
1794         EC_POINT_free(srvr_ecpoint);
1795         if (ecdh != NULL)
1796                 EC_KEY_free(ecdh);
1797 #endif
1798         EVP_MD_CTX_cleanup(&md_ctx);
1799         return(-1);
1800         }
1801
1802 int ssl3_get_certificate_request(SSL *s)
1803         {
1804         int ok,ret=0;
1805         unsigned long n,nc,l;
1806         unsigned int llen, ctype_num,i;
1807         X509_NAME *xn=NULL;
1808         const unsigned char *p,*q;
1809         unsigned char *d;
1810         STACK_OF(X509_NAME) *ca_sk=NULL;
1811
1812         n=s->method->ssl_get_message(s,
1813                 SSL3_ST_CR_CERT_REQ_A,
1814                 SSL3_ST_CR_CERT_REQ_B,
1815                 -1,
1816                 s->max_cert_list,
1817                 &ok);
1818
1819         if (!ok) return((int)n);
1820
1821         s->s3->tmp.cert_req=0;
1822
1823         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1824                 {
1825                 s->s3->tmp.reuse_message=1;
1826                 /* If we get here we don't need any cached handshake records
1827                  * as we wont be doing client auth.
1828                  */
1829                 if (s->s3->handshake_buffer)
1830                         {
1831                         if (!ssl3_digest_cached_records(s))
1832                                 goto err;
1833                         }
1834                 return(1);
1835                 }
1836
1837         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1838                 {
1839                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1840                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1841                 goto err;
1842                 }
1843
1844         /* TLS does not like anon-DH with client cert */
1845         if (s->version > SSL3_VERSION)
1846                 {
1847                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1848                         {
1849                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1850                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1851                         goto err;
1852                         }
1853                 }
1854
1855         p=d=(unsigned char *)s->init_msg;
1856
1857         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1858                 {
1859                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1860                 goto err;
1861                 }
1862
1863         /* get the certificate types */
1864         ctype_num= *(p++);
1865         if (ctype_num > SSL3_CT_NUMBER)
1866                 ctype_num=SSL3_CT_NUMBER;
1867         for (i=0; i<ctype_num; i++)
1868                 s->s3->tmp.ctype[i]= p[i];
1869         p+=ctype_num;
1870         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1871                 {
1872                 n2s(p, llen);
1873                 /* Check we have enough room for signature algorithms and
1874                  * following length value.
1875                  */
1876                 if ((unsigned long)(p - d + llen + 2) > n)
1877                         {
1878                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1879                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1880                         goto err;
1881                         }
1882                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1883                         {
1884                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1885                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1886                         goto err;
1887                         }
1888                 p += llen;
1889                 }
1890
1891         /* get the CA RDNs */
1892         n2s(p,llen);
1893 #if 0
1894 {
1895 FILE *out;
1896 out=fopen("/tmp/vsign.der","w");
1897 fwrite(p,1,llen,out);
1898 fclose(out);
1899 }
1900 #endif
1901
1902         if ((unsigned long)(p - d + llen) != n)
1903                 {
1904                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1905                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1906                 goto err;
1907                 }
1908
1909         for (nc=0; nc<llen; )
1910                 {
1911                 n2s(p,l);
1912                 if ((l+nc+2) > llen)
1913                         {
1914                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1915                                 goto cont; /* netscape bugs */
1916                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1917                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1918                         goto err;
1919                         }
1920
1921                 q=p;
1922
1923                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1924                         {
1925                         /* If netscape tolerance is on, ignore errors */
1926                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1927                                 goto cont;
1928                         else
1929                                 {
1930                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1931                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1932                                 goto err;
1933                                 }
1934                         }
1935
1936                 if (q != (p+l))
1937                         {
1938                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1939                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1940                         goto err;
1941                         }
1942                 if (!sk_X509_NAME_push(ca_sk,xn))
1943                         {
1944                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1945                         goto err;
1946                         }
1947
1948                 p+=l;
1949                 nc+=l+2;
1950                 }
1951
1952         if (0)
1953                 {
1954 cont:
1955                 ERR_clear_error();
1956                 }
1957
1958         /* we should setup a certificate to return.... */
1959         s->s3->tmp.cert_req=1;
1960         s->s3->tmp.ctype_num=ctype_num;
1961         if (s->s3->tmp.ca_names != NULL)
1962                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1963         s->s3->tmp.ca_names=ca_sk;
1964         ca_sk=NULL;
1965
1966         ret=1;
1967 err:
1968         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1969         return(ret);
1970         }
1971
1972 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1973         {
1974         return(X509_NAME_cmp(*a,*b));
1975         }
1976 #ifndef OPENSSL_NO_TLSEXT
1977 int ssl3_get_new_session_ticket(SSL *s)
1978         {
1979         int ok,al,ret=0, ticklen;
1980         long n;
1981         const unsigned char *p;
1982         unsigned char *d;
1983
1984         n=s->method->ssl_get_message(s,
1985                 SSL3_ST_CR_SESSION_TICKET_A,
1986                 SSL3_ST_CR_SESSION_TICKET_B,
1987                 -1,
1988                 16384,
1989                 &ok);
1990
1991         if (!ok)
1992                 return((int)n);
1993
1994         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1995                 {
1996                 s->s3->tmp.reuse_message=1;
1997                 return(1);
1998                 }
1999         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2000                 {
2001                 al=SSL_AD_UNEXPECTED_MESSAGE;
2002                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2003                 goto f_err;
2004                 }
2005         if (n < 6)
2006                 {
2007                 /* need at least ticket_lifetime_hint + ticket length */
2008                 al = SSL_AD_DECODE_ERROR;
2009                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2010                 goto f_err;
2011                 }
2012
2013         p=d=(unsigned char *)s->init_msg;
2014         n2l(p, s->session->tlsext_tick_lifetime_hint);
2015         n2s(p, ticklen);
2016         /* ticket_lifetime_hint + ticket_length + ticket */
2017         if (ticklen + 6 != n)
2018                 {
2019                 al = SSL_AD_DECODE_ERROR;
2020                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2021                 goto f_err;
2022                 }
2023         if (s->session->tlsext_tick)
2024                 {
2025                 OPENSSL_free(s->session->tlsext_tick);
2026                 s->session->tlsext_ticklen = 0;
2027                 }
2028         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2029         if (!s->session->tlsext_tick)
2030                 {
2031                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2032                 goto err;
2033                 }
2034         memcpy(s->session->tlsext_tick, p, ticklen);
2035         s->session->tlsext_ticklen = ticklen;
2036         /* There are two ways to detect a resumed ticket sesion.
2037          * One is to set an appropriate session ID and then the server
2038          * must return a match in ServerHello. This allows the normal
2039          * client session ID matching to work and we know much 
2040          * earlier that the ticket has been accepted.
2041          * 
2042          * The other way is to set zero length session ID when the
2043          * ticket is presented and rely on the handshake to determine
2044          * session resumption.
2045          *
2046          * We choose the former approach because this fits in with
2047          * assumptions elsewhere in OpenSSL. The session ID is set
2048          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2049          * ticket.
2050          */ 
2051         EVP_Digest(p, ticklen,
2052                         s->session->session_id, &s->session->session_id_length,
2053 #ifndef OPENSSL_NO_SHA256
2054                                                         EVP_sha256(), NULL);
2055 #else
2056                                                         EVP_sha1(), NULL);
2057 #endif
2058         ret=1;
2059         return(ret);
2060 f_err:
2061         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2062 err:
2063         return(-1);
2064         }
2065
2066 int ssl3_get_cert_status(SSL *s)
2067         {
2068         int ok, al;
2069         unsigned long resplen,n;
2070         const unsigned char *p;
2071
2072         n=s->method->ssl_get_message(s,
2073                 SSL3_ST_CR_CERT_STATUS_A,
2074                 SSL3_ST_CR_CERT_STATUS_B,
2075                 SSL3_MT_CERTIFICATE_STATUS,
2076                 16384,
2077                 &ok);
2078
2079         if (!ok) return((int)n);
2080         if (n < 4)
2081                 {
2082                 /* need at least status type + length */
2083                 al = SSL_AD_DECODE_ERROR;
2084                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2085                 goto f_err;
2086                 }
2087         p = (unsigned char *)s->init_msg;
2088         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2089                 {
2090                 al = SSL_AD_DECODE_ERROR;
2091                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2092                 goto f_err;
2093                 }
2094         n2l3(p, resplen);
2095         if (resplen + 4 != n)
2096                 {
2097                 al = SSL_AD_DECODE_ERROR;
2098                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2099                 goto f_err;
2100                 }
2101         if (s->tlsext_ocsp_resp)
2102                 OPENSSL_free(s->tlsext_ocsp_resp);
2103         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2104         if (!s->tlsext_ocsp_resp)
2105                 {
2106                 al = SSL_AD_INTERNAL_ERROR;
2107                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2108                 goto f_err;
2109                 }
2110         s->tlsext_ocsp_resplen = resplen;
2111         if (s->ctx->tlsext_status_cb)
2112                 {
2113                 int ret;
2114                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2115                 if (ret == 0)
2116                         {
2117                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2118                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2119                         goto f_err;
2120                         }
2121                 if (ret < 0)
2122                         {
2123                         al = SSL_AD_INTERNAL_ERROR;
2124                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2125                         goto f_err;
2126                         }
2127                 }
2128         return 1;
2129 f_err:
2130         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2131         return(-1);
2132         }
2133 #endif
2134
2135 int ssl3_get_server_done(SSL *s)
2136         {
2137         int ok,ret=0;
2138         long n;
2139
2140         n=s->method->ssl_get_message(s,
2141                 SSL3_ST_CR_SRVR_DONE_A,
2142                 SSL3_ST_CR_SRVR_DONE_B,
2143                 SSL3_MT_SERVER_DONE,
2144                 30, /* should be very small, like 0 :-) */
2145                 &ok);
2146
2147         if (!ok) return((int)n);
2148         if (n > 0)
2149                 {
2150                 /* should contain no data */
2151                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2152                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2153                 return -1;
2154                 }
2155         ret=1;
2156         return(ret);
2157         }
2158
2159
2160 int ssl3_send_client_key_exchange(SSL *s)
2161         {
2162         unsigned char *p,*d;
2163         int n;
2164         unsigned long alg_k;
2165 #ifndef OPENSSL_NO_RSA
2166         unsigned char *q;
2167         EVP_PKEY *pkey=NULL;
2168 #endif
2169 #ifndef OPENSSL_NO_KRB5
2170         KSSL_ERR kssl_err;
2171 #endif /* OPENSSL_NO_KRB5 */
2172 #ifndef OPENSSL_NO_ECDH
2173         EC_KEY *clnt_ecdh = NULL;
2174         const EC_POINT *srvr_ecpoint = NULL;
2175         EVP_PKEY *srvr_pub_pkey = NULL;
2176         unsigned char *encodedPoint = NULL;
2177         int encoded_pt_len = 0;
2178         BN_CTX * bn_ctx = NULL;
2179 #endif
2180
2181         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2182                 {
2183                 d=(unsigned char *)s->init_buf->data;
2184                 p= &(d[4]);
2185
2186                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2187
2188                 /* Fool emacs indentation */
2189                 if (0) {}
2190 #ifndef OPENSSL_NO_RSA
2191                 else if (alg_k & SSL_kRSA)
2192                         {
2193                         RSA *rsa;
2194                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2195
2196                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2197                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2198                         else
2199                                 {
2200                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2201                                 if ((pkey == NULL) ||
2202                                         (pkey->type != EVP_PKEY_RSA) ||
2203                                         (pkey->pkey.rsa == NULL))
2204                                         {
2205                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2206                                         goto err;
2207                                         }
2208                                 rsa=pkey->pkey.rsa;
2209                                 EVP_PKEY_free(pkey);
2210                                 }
2211                                 
2212                         tmp_buf[0]=s->client_version>>8;
2213                         tmp_buf[1]=s->client_version&0xff;
2214                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2215                                         goto err;
2216
2217                         s->session->master_key_length=sizeof tmp_buf;
2218
2219                         q=p;
2220                         /* Fix buf for TLS and beyond */
2221                         if (s->version > SSL3_VERSION)
2222                                 p+=2;
2223                         n=RSA_public_encrypt(sizeof tmp_buf,
2224                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2225 #ifdef PKCS1_CHECK
2226                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2227                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2228 #endif
2229                         if (n <= 0)
2230                                 {
2231                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2232                                 goto err;
2233                                 }
2234
2235                         /* Fix buf for TLS and beyond */
2236                         if (s->version > SSL3_VERSION)
2237                                 {
2238                                 s2n(n,q);
2239                                 n+=2;
2240                                 }
2241
2242                         s->session->master_key_length=
2243                                 s->method->ssl3_enc->generate_master_secret(s,
2244                                         s->session->master_key,
2245                                         tmp_buf,sizeof tmp_buf);
2246                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2247                         }
2248 #endif
2249 #ifndef OPENSSL_NO_KRB5
2250                 else if (alg_k & SSL_kKRB5)
2251                         {
2252                         krb5_error_code krb5rc;
2253                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2254                         /*  krb5_data   krb5_ap_req;  */
2255                         krb5_data       *enc_ticket;
2256                         krb5_data       authenticator, *authp = NULL;
2257                         EVP_CIPHER_CTX  ciph_ctx;
2258                         const EVP_CIPHER *enc = NULL;
2259                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2260                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2261                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
2262                                                 + EVP_MAX_IV_LENGTH];
2263                         int             padl, outl = sizeof(epms);
2264
2265                         EVP_CIPHER_CTX_init(&ciph_ctx);
2266
2267 #ifdef KSSL_DEBUG
2268                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2269                                 alg_k, SSL_kKRB5);
2270 #endif  /* KSSL_DEBUG */
2271
2272                         authp = NULL;
2273 #ifdef KRB5SENDAUTH
2274                         if (KRB5SENDAUTH)  authp = &authenticator;
2275 #endif  /* KRB5SENDAUTH */
2276
2277                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2278                                 &kssl_err);
2279                         enc = kssl_map_enc(kssl_ctx->enctype);
2280                         if (enc == NULL)
2281                             goto err;
2282 #ifdef KSSL_DEBUG
2283                         {
2284                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2285                         if (krb5rc && kssl_err.text)
2286                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2287                         }
2288 #endif  /* KSSL_DEBUG */
2289
2290                         if (krb5rc)
2291                                 {
2292                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2293                                                 SSL_AD_HANDSHAKE_FAILURE);
2294                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2295                                                 kssl_err.reason);
2296                                 goto err;
2297                                 }
2298
2299                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2300                         **  in place of RFC 2712 KerberosWrapper, as in:
2301                         **
2302                         **  Send ticket (copy to *p, set n = length)
2303                         **  n = krb5_ap_req.length;
2304                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2305                         **  if (krb5_ap_req.data)  
2306                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2307                         **
2308                         **  Now using real RFC 2712 KerberosWrapper
2309                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2310                         **  Note: 2712 "opaque" types are here replaced
2311                         **  with a 2-byte length followed by the value.
2312                         **  Example:
2313                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2314                         **  Where "xx xx" = length bytes.  Shown here with
2315                         **  optional authenticator omitted.
2316                         */
2317
2318                         /*  KerberosWrapper.Ticket              */
2319                         s2n(enc_ticket->length,p);
2320                         memcpy(p, enc_ticket->data, enc_ticket->length);
2321                         p+= enc_ticket->length;
2322                         n = enc_ticket->length + 2;
2323
2324                         /*  KerberosWrapper.Authenticator       */
2325                         if (authp  &&  authp->length)  
2326                                 {
2327                                 s2n(authp->length,p);
2328                                 memcpy(p, authp->data, authp->length);
2329                                 p+= authp->length;
2330                                 n+= authp->length + 2;
2331                                 
2332                                 free(authp->data);
2333                                 authp->data = NULL;
2334                                 authp->length = 0;
2335                                 }
2336                         else
2337                                 {
2338                                 s2n(0,p);/*  null authenticator length  */
2339                                 n+=2;
2340                                 }
2341  
2342                             tmp_buf[0]=s->client_version>>8;
2343                             tmp_buf[1]=s->client_version&0xff;
2344                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2345                                 goto err;
2346
2347                         /*  20010420 VRS.  Tried it this way; failed.
2348                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2349                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2350                         **                              kssl_ctx->length);
2351                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2352                         */
2353
2354                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2355                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2356                                 kssl_ctx->key,iv);
2357                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2358                                 sizeof tmp_buf);
2359                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2360                         outl += padl;
2361                         if (outl > (int)sizeof epms)
2362                                 {
2363                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2364                                 goto err;
2365                                 }
2366                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2367
2368                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2369                         s2n(outl,p);
2370                         memcpy(p, epms, outl);
2371                         p+=outl;
2372                         n+=outl + 2;
2373
2374                         s->session->master_key_length=
2375                                 s->method->ssl3_enc->generate_master_secret(s,
2376                                         s->session->master_key,
2377                                         tmp_buf, sizeof tmp_buf);
2378
2379                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2380                         OPENSSL_cleanse(epms, outl);
2381                         }
2382 #endif
2383 #ifndef OPENSSL_NO_DH
2384                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2385                         {
2386                         DH *dh_srvr,*dh_clnt;
2387
2388                         if (s->session->sess_cert == NULL) 
2389                                 {
2390                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2391                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2392                                 goto err;
2393                                 }
2394
2395                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2396                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2397                         else
2398                                 {
2399                                 /* we get them from the cert */
2400                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2401                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2402                                 goto err;
2403                                 }
2404                         
2405                         /* generate a new random key */
2406                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2407                                 {
2408                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2409                                 goto err;
2410                                 }
2411                         if (!DH_generate_key(dh_clnt))
2412                                 {
2413                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2414                                 DH_free(dh_clnt);
2415                                 goto err;
2416                                 }
2417
2418                         /* use the 'p' output buffer for the DH key, but
2419                          * make sure to clear it out afterwards */
2420
2421                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2422
2423                         if (n <= 0)
2424                                 {
2425                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2426                                 DH_free(dh_clnt);
2427                                 goto err;
2428                                 }
2429
2430                         /* generate master key from the result */
2431                         s->session->master_key_length=
2432                                 s->method->ssl3_enc->generate_master_secret(s,
2433                                         s->session->master_key,p,n);
2434                         /* clean up */
2435                         memset(p,0,n);
2436
2437                         /* send off the data */
2438                         n=BN_num_bytes(dh_clnt->pub_key);
2439                         s2n(n,p);
2440                         BN_bn2bin(dh_clnt->pub_key,p);
2441                         n+=2;
2442
2443                         DH_free(dh_clnt);
2444
2445                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2446                         }
2447 #endif
2448
2449 #ifndef OPENSSL_NO_ECDH 
2450                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2451                         {
2452                         const EC_GROUP *srvr_group = NULL;
2453                         EC_KEY *tkey;
2454                         int ecdh_clnt_cert = 0;
2455                         int field_size = 0;
2456
2457                         /* Did we send out the client's
2458                          * ECDH share for use in premaster
2459                          * computation as part of client certificate?
2460                          * If so, set ecdh_clnt_cert to 1.
2461                          */
2462                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
2463                                 {
2464                                 /* XXX: For now, we do not support client
2465                                  * authentication using ECDH certificates.
2466                                  * To add such support, one needs to add
2467                                  * code that checks for appropriate 
2468                                  * conditions and sets ecdh_clnt_cert to 1.
2469                                  * For example, the cert have an ECC
2470                                  * key on the same curve as the server's
2471                                  * and the key should be authorized for
2472                                  * key agreement.
2473                                  *
2474                                  * One also needs to add code in ssl3_connect
2475                                  * to skip sending the certificate verify
2476                                  * message.
2477                                  *
2478                                  * if ((s->cert->key->privatekey != NULL) &&
2479                                  *     (s->cert->key->privatekey->type ==
2480                                  *      EVP_PKEY_EC) && ...)
2481                                  * ecdh_clnt_cert = 1;
2482                                  */
2483                                 }
2484
2485                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2486                                 {
2487                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2488                                 }
2489                         else
2490                                 {
2491                                 /* Get the Server Public Key from Cert */
2492                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2493                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2494                                 if ((srvr_pub_pkey == NULL) ||
2495                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2496                                     (srvr_pub_pkey->pkey.ec == NULL))
2497                                         {
2498                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2499                                             ERR_R_INTERNAL_ERROR);
2500                                         goto err;
2501                                         }
2502
2503                                 tkey = srvr_pub_pkey->pkey.ec;
2504                                 }
2505
2506                         srvr_group   = EC_KEY_get0_group(tkey);
2507                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2508
2509                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2510                                 {
2511                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2512                                     ERR_R_INTERNAL_ERROR);
2513                                 goto err;
2514                                 }
2515
2516                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
2517                                 {
2518                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2519                                 goto err;
2520                                 }
2521
2522                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2523                                 {
2524                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2525                                 goto err;
2526                                 }
2527                         if (ecdh_clnt_cert) 
2528                                 { 
2529                                 /* Reuse key info from our certificate
2530                                  * We only need our private key to perform
2531                                  * the ECDH computation.
2532                                  */
2533                                 const BIGNUM *priv_key;
2534                                 tkey = s->cert->key->privatekey->pkey.ec;
2535                                 priv_key = EC_KEY_get0_private_key(tkey);
2536                                 if (priv_key == NULL)
2537                                         {
2538                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2539                                         goto err;
2540                                         }
2541                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2542                                         {
2543                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2544                                         goto err;
2545                                         }
2546                                 }
2547                         else 
2548                                 {
2549                                 /* Generate a new ECDH key pair */
2550                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2551                                         {
2552                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2553                                         goto err;
2554                                         }
2555                                 }
2556
2557                         /* use the 'p' output buffer for the ECDH key, but
2558                          * make sure to clear it out afterwards
2559                          */
2560
2561                         field_size = EC_GROUP_get_degree(srvr_group);
2562                         if (field_size <= 0)
2563                                 {
2564                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2565                                        ERR_R_ECDH_LIB);
2566                                 goto err;
2567                                 }
2568                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2569                         if (n <= 0)
2570                                 {
2571                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2572                                        ERR_R_ECDH_LIB);
2573                                 goto err;
2574                                 }
2575
2576                         /* generate master key from the result */
2577                         s->session->master_key_length = s->method->ssl3_enc \
2578                             -> generate_master_secret(s, 
2579                                 s->session->master_key,
2580                                 p, n);
2581
2582                         memset(p, 0, n); /* clean up */
2583
2584                         if (ecdh_clnt_cert) 
2585                                 {
2586                                 /* Send empty client key exch message */
2587                                 n = 0;
2588                                 }
2589                         else 
2590                                 {
2591                                 /* First check the size of encoding and
2592                                  * allocate memory accordingly.
2593                                  */
2594                                 encoded_pt_len = 
2595                                     EC_POINT_point2oct(srvr_group, 
2596                                         EC_KEY_get0_public_key(clnt_ecdh), 
2597                                         POINT_CONVERSION_UNCOMPRESSED, 
2598                                         NULL, 0, NULL);
2599
2600                                 encodedPoint = (unsigned char *) 
2601                                     OPENSSL_malloc(encoded_pt_len * 
2602                                         sizeof(unsigned char)); 
2603                                 bn_ctx = BN_CTX_new();
2604                                 if ((encodedPoint == NULL) || 
2605                                     (bn_ctx == NULL)) 
2606                                         {
2607                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2608                                         goto err;
2609                                         }
2610
2611                                 /* Encode the public key */
2612                                 n = EC_POINT_point2oct(srvr_group, 
2613                                     EC_KEY_get0_public_key(clnt_ecdh), 
2614                                     POINT_CONVERSION_UNCOMPRESSED, 
2615                                     encodedPoint, encoded_pt_len, bn_ctx);
2616
2617                                 *p = n; /* length of encoded point */
2618                                 /* Encoded point will be copied here */
2619                                 p += 1; 
2620                                 /* copy the point */
2621                                 memcpy((unsigned char *)p, encodedPoint, n);
2622                                 /* increment n to account for length field */
2623                                 n += 1; 
2624                                 }
2625
2626                         /* Free allocated memory */
2627                         BN_CTX_free(bn_ctx);
2628                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2629                         if (clnt_ecdh != NULL) 
2630                                  EC_KEY_free(clnt_ecdh);
2631                         EVP_PKEY_free(srvr_pub_pkey);
2632                         }
2633 #endif /* !OPENSSL_NO_ECDH */
2634                 else if (alg_k & SSL_kGOST) 
2635                         {
2636                         /* GOST key exchange message creation */
2637                         EVP_PKEY_CTX *pkey_ctx;
2638                         X509 *peer_cert; 
2639                         size_t msglen;
2640                         unsigned int md_len;
2641                         int keytype;
2642                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2643                         EVP_MD_CTX *ukm_hash;
2644                         EVP_PKEY *pub_key;
2645
2646                         /* Get server sertificate PKEY and create ctx from it */
2647                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2648                         if (!peer_cert) 
2649                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2650                         if (!peer_cert)         {
2651                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2652                                         goto err;
2653                                 }       
2654                                 
2655                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2656                         /* If we have send a certificate, and certificate key
2657
2658                          * parameters match those of server certificate, use
2659                          * certificate key for key exchange
2660                          */
2661
2662                          /* Otherwise, generate ephemeral key pair */
2663                                         
2664                         EVP_PKEY_encrypt_init(pkey_ctx);
2665                           /* Generate session key */    
2666                     RAND_bytes(premaster_secret,32);
2667                         /* If we have client certificate, use its secret as peer key */
2668                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2669                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2670                                         /* If there was an error - just ignore it. Ephemeral key
2671                                         * would be used
2672                                         */
2673                                         ERR_clear_error();
2674                                 }
2675                         }                       
2676                         /* Compute shared IV and store it in algorithm-specific
2677                          * context data */
2678                         ukm_hash = EVP_MD_CTX_create();
2679                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2680                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2681                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2682                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2683                         EVP_MD_CTX_destroy(ukm_hash);
2684                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2685                                 8,shared_ukm)<0) {
2686                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2687                                                 SSL_R_LIBRARY_BUG);
2688                                         goto err;
2689                                 }       
2690                         /* Make GOST keytransport blob message */
2691                         /*Encapsulate it into sequence */
2692                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2693                         msglen=255;
2694                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2695                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2696                                         SSL_R_LIBRARY_BUG);
2697                                 goto err;
2698                         }
2699                         if (msglen >= 0x80)
2700                                 {
2701                                 *(p++)=0x81;
2702                                 *(p++)= msglen & 0xff;
2703                                 n=msglen+3;
2704                                 }
2705                         else
2706                                 {
2707                                 *(p++)= msglen & 0xff;
2708                                 n=msglen+2;
2709                                 }
2710                         memcpy(p, tmp, msglen);
2711                         /* Check if pubkey from client certificate was used */
2712                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2713                                 {
2714                                 /* Set flag "skip certificate verify" */
2715                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2716                                 }
2717                         EVP_PKEY_CTX_free(pkey_ctx);
2718                         s->session->master_key_length=
2719                                 s->method->ssl3_enc->generate_master_secret(s,
2720                                         s->session->master_key,premaster_secret,32);
2721                         EVP_PKEY_free(pub_key);
2722
2723                         }
2724 #ifndef OPENSSL_NO_SRP
2725                 else if (alg_k & SSL_kSRP)
2726                         {
2727                         if (s->srp_ctx.A != NULL)
2728                                 {
2729                                 /* send off the data */
2730                                 n=BN_num_bytes(s->srp_ctx.A);
2731                                 s2n(n,p);
2732                                 BN_bn2bin(s->srp_ctx.A,p);
2733                                 n+=2;
2734                                 }
2735                         else
2736                                 {
2737                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2738                                 goto err;
2739                                 }
2740                         if (s->session->srp_username != NULL)
2741                                 OPENSSL_free(s->session->srp_username);
2742                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2743                         if (s->session->srp_username == NULL)
2744                                 {
2745                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2746                                         ERR_R_MALLOC_FAILURE);
2747                                 goto err;
2748                                 }
2749
2750                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2751                                 {
2752                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2753                                 goto err;
2754                                 }
2755                         }
2756 #endif
2757 #ifndef OPENSSL_NO_PSK
2758                 else if (alg_k & SSL_kPSK)
2759                         {
2760                         char identity[PSK_MAX_IDENTITY_LEN];
2761                         unsigned char *t = NULL;
2762                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2763                         unsigned int pre_ms_len = 0, psk_len = 0;
2764                         int psk_err = 1;
2765
2766                         n = 0;
2767                         if (s->psk_client_callback == NULL)
2768                                 {
2769                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2770                                         SSL_R_PSK_NO_CLIENT_CB);
2771                                 goto err;
2772                                 }
2773
2774                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2775                                 identity, PSK_MAX_IDENTITY_LEN,
2776                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2777                         if (psk_len > PSK_MAX_PSK_LEN)
2778                                 {
2779                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2780                                         ERR_R_INTERNAL_ERROR);
2781                                 goto psk_err;
2782                                 }
2783                         else if (psk_len == 0)
2784                                 {
2785                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2786                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2787                                 goto psk_err;
2788                                 }
2789
2790                         /* create PSK pre_master_secret */
2791                         pre_ms_len = 2+psk_len+2+psk_len;
2792                         t = psk_or_pre_ms;
2793                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2794                         s2n(psk_len, t);
2795                         memset(t, 0, psk_len);
2796                         t+=psk_len;
2797                         s2n(psk_len, t);
2798
2799                         if (s->session->psk_identity_hint != NULL)
2800                                 OPENSSL_free(s->session->psk_identity_hint);
2801                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2802                         if (s->ctx->psk_identity_hint != NULL &&
2803                                 s->session->psk_identity_hint == NULL)
2804                                 {
2805                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2806                                         ERR_R_MALLOC_FAILURE);
2807                                 goto psk_err;
2808                                 }
2809
2810                         if (s->session->psk_identity != NULL)
2811                                 OPENSSL_free(s->session->psk_identity);
2812                         s->session->psk_identity = BUF_strdup(identity);
2813                         if (s->session->psk_identity == NULL)
2814                                 {
2815                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2816                                         ERR_R_MALLOC_FAILURE);
2817                                 goto psk_err;
2818                                 }
2819
2820                         s->session->master_key_length =
2821                                 s->method->ssl3_enc->generate_master_secret(s,
2822                                         s->session->master_key,
2823                                         psk_or_pre_ms, pre_ms_len); 
2824                         n = strlen(identity);
2825                         s2n(n, p);
2826                         memcpy(p, identity, n);
2827                         n+=2;
2828                         psk_err = 0;
2829                 psk_err:
2830                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2831                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2832                         if (psk_err != 0)
2833                                 {
2834                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2835                                 goto err;
2836                                 }
2837                         }
2838 #endif
2839                 else
2840                         {
2841                         ssl3_send_alert(s, SSL3_AL_FATAL,
2842                             SSL_AD_HANDSHAKE_FAILURE);
2843                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2844                             ERR_R_INTERNAL_ERROR);
2845                         goto err;
2846                         }
2847                 
2848                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2849                 l2n3(n,d);
2850
2851                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2852                 /* number of bytes to write */
2853                 s->init_num=n+4;
2854                 s->init_off=0;
2855                 }
2856
2857         /* SSL3_ST_CW_KEY_EXCH_B */
2858         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2859 err:
2860 #ifndef OPENSSL_NO_ECDH
2861         BN_CTX_free(bn_ctx);
2862         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2863         if (clnt_ecdh != NULL) 
2864                 EC_KEY_free(clnt_ecdh);
2865         EVP_PKEY_free(srvr_pub_pkey);
2866 #endif
2867         return(-1);
2868         }
2869
2870 int ssl3_send_client_verify(SSL *s)
2871         {
2872         unsigned char *p,*d;
2873         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2874         EVP_PKEY *pkey;
2875         EVP_PKEY_CTX *pctx=NULL;
2876         EVP_MD_CTX mctx;
2877         unsigned u=0;
2878         unsigned long n;
2879         int j;
2880
2881         EVP_MD_CTX_init(&mctx);
2882
2883         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2884                 {
2885                 d=(unsigned char *)s->init_buf->data;
2886                 p= &(d[4]);
2887                 pkey=s->cert->key->privatekey;
2888 /* Create context from key and test if sha1 is allowed as digest */
2889                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2890                 EVP_PKEY_sign_init(pctx);
2891                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2892                         {
2893                         if (TLS1_get_version(s) < TLS1_2_VERSION)
2894                                 s->method->ssl3_enc->cert_verify_mac(s,
2895                                                 NID_sha1,
2896                                                 &(data[MD5_DIGEST_LENGTH]));
2897                         }
2898                 else
2899                         {
2900                         ERR_clear_error();
2901                         }
2902                 /* For TLS v1.2 send signature algorithm and signature
2903                  * using agreed digest and cached handshake records.
2904                  */
2905                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2906                         {
2907                         long hdatalen = 0;
2908                         void *hdata;
2909                         const EVP_MD *md = s->cert->key->digest;
2910                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
2911                                                                 &hdata);
2912                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
2913                                 {
2914                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2915                                                 ERR_R_INTERNAL_ERROR);
2916                                 goto err;
2917                                 }
2918                         p += 2;
2919 #ifdef SSL_DEBUG
2920                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
2921                                                         EVP_MD_name(md));
2922 #endif
2923                         if (!EVP_SignInit_ex(&mctx, md, NULL)
2924                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
2925                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
2926                                 {
2927                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2928                                                 ERR_R_EVP_LIB);
2929                                 goto err;
2930                                 }
2931                         s2n(u,p);
2932                         n = u + 4;
2933                         if (!ssl3_digest_cached_records(s))
2934                                 goto err;
2935                         }
2936                 else
2937 #ifndef OPENSSL_NO_RSA
2938                 if (pkey->type == EVP_PKEY_RSA)
2939                         {
2940                         s->method->ssl3_enc->cert_verify_mac(s,
2941                                 NID_md5,
2942                                 &(data[0]));
2943                         if (RSA_sign(NID_md5_sha1, data,
2944                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2945                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2946                                 {
2947                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2948                                 goto err;
2949                                 }
2950                         s2n(u,p);
2951                         n=u+2;
2952                         }
2953                 else
2954 #endif
2955 #ifndef OPENSSL_NO_DSA
2956                         if (pkey->type == EVP_PKEY_DSA)
2957                         {
2958                         if (!DSA_sign(pkey->save_type,
2959                                 &(data[MD5_DIGEST_LENGTH]),
2960                                 SHA_DIGEST_LENGTH,&(p[2]),
2961                                 (unsigned int *)&j,pkey->pkey.dsa))
2962                                 {
2963                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2964                                 goto err;
2965                                 }
2966                         s2n(j,p);
2967                         n=j+2;
2968                         }
2969                 else
2970 #endif
2971 #ifndef OPENSSL_NO_ECDSA
2972                         if (pkey->type == EVP_PKEY_EC)
2973                         {
2974                         if (!ECDSA_sign(pkey->save_type,
2975                                 &(data[MD5_DIGEST_LENGTH]),
2976                                 SHA_DIGEST_LENGTH,&(p[2]),
2977                                 (unsigned int *)&j,pkey->pkey.ec))
2978                                 {
2979                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2980                                     ERR_R_ECDSA_LIB);
2981                                 goto err;
2982                                 }
2983                         s2n(j,p);
2984                         n=j+2;
2985                         }
2986                 else
2987 #endif
2988                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) 
2989                 {
2990                 unsigned char signbuf[64];
2991                 int i;
2992                 size_t sigsize=64;
2993                 s->method->ssl3_enc->cert_verify_mac(s,
2994                         NID_id_GostR3411_94,
2995                         data);
2996                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2997                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2998                         ERR_R_INTERNAL_ERROR);
2999                         goto err;
3000                 }
3001                 for (i=63,j=0; i>=0; j++, i--) {
3002                         p[2+j]=signbuf[i];
3003                 }       
3004                 s2n(j,p);
3005                 n=j+2;
3006                 }
3007                 else
3008                 {
3009                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3010                         goto err;
3011                 }
3012                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3013                 l2n3(n,d);
3014
3015                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3016                 s->init_num=(int)n+4;
3017                 s->init_off=0;
3018                 }
3019         EVP_MD_CTX_cleanup(&mctx);
3020         EVP_PKEY_CTX_free(pctx);
3021         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3022 err:
3023         EVP_MD_CTX_cleanup(&mctx);
3024         EVP_PKEY_CTX_free(pctx);
3025         return(-1);
3026         }
3027
3028 int ssl3_send_client_certificate(SSL *s)
3029         {
3030         X509 *x509=NULL;
3031         EVP_PKEY *pkey=NULL;
3032         int i;
3033         unsigned long l;
3034
3035         if (s->state == SSL3_ST_CW_CERT_A)
3036                 {
3037                 if ((s->cert == NULL) ||
3038                         (s->cert->key->x509 == NULL) ||
3039                         (s->cert->key->privatekey == NULL))
3040                         s->state=SSL3_ST_CW_CERT_B;
3041                 else
3042                         s->state=SSL3_ST_CW_CERT_C;
3043                 }
3044
3045         /* We need to get a client cert */
3046         if (s->state == SSL3_ST_CW_CERT_B)
3047                 {
3048                 /* If we get an error, we need to
3049                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3050                  * We then get retied later */
3051                 i=0;
3052                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3053                 if (i < 0)
3054                         {
3055                         s->rwstate=SSL_X509_LOOKUP;
3056                         return(-1);
3057                         }
3058                 s->rwstate=SSL_NOTHING;
3059                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3060                         {
3061                         s->state=SSL3_ST_CW_CERT_B;
3062                         if (    !SSL_use_certificate(s,x509) ||
3063                                 !SSL_use_PrivateKey(s,pkey))
3064                                 i=0;
3065                         }
3066                 else if (i == 1)
3067                         {
3068                         i=0;
3069                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3070                         }
3071
3072                 if (x509 != NULL) X509_free(x509);
3073                 if (pkey != NULL) EVP_PKEY_free(pkey);
3074                 if (i == 0)
3075                         {
3076                         if (s->version == SSL3_VERSION)
3077                                 {
3078                                 s->s3->tmp.cert_req=0;
3079                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3080                                 return(1);
3081                                 }
3082                         else
3083                                 {
3084                                 s->s3->tmp.cert_req=2;
3085                                 }
3086                         }
3087
3088                 /* Ok, we have a cert */
3089                 s->state=SSL3_ST_CW_CERT_C;
3090                 }
3091
3092         if (s->state == SSL3_ST_CW_CERT_C)
3093                 {
3094                 s->state=SSL3_ST_CW_CERT_D;
3095                 l=ssl3_output_cert_chain(s,
3096                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
3097                 s->init_num=(int)l;
3098                 s->init_off=0;
3099                 }
3100         /* SSL3_ST_CW_CERT_D */
3101         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3102         }
3103
3104 #define has_bits(i,m)   (((i)&(m)) == (m))
3105
3106 int ssl3_check_cert_and_algorithm(SSL *s)
3107         {
3108         int i,idx;
3109         long alg_k,alg_a;
3110         EVP_PKEY *pkey=NULL;
3111         SESS_CERT *sc;
3112 #ifndef OPENSSL_NO_RSA
3113         RSA *rsa;
3114 #endif
3115 #ifndef OPENSSL_NO_DH
3116         DH *dh;
3117 #endif
3118
3119         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3120         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3121
3122         /* we don't have a certificate */
3123         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3124                 return(1);
3125
3126         sc=s->session->sess_cert;
3127         if (sc == NULL)
3128                 {
3129                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3130                 goto err;
3131                 }
3132
3133 #ifndef OPENSSL_NO_RSA
3134         rsa=s->session->sess_cert->peer_rsa_tmp;
3135 #endif
3136 #ifndef OPENSSL_NO_DH
3137         dh=s->session->sess_cert->peer_dh_tmp;
3138 #endif
3139
3140         /* This is the passed certificate */
3141
3142         idx=sc->peer_cert_type;
3143 #ifndef OPENSSL_NO_ECDH
3144         if (idx == SSL_PKEY_ECC)
3145                 {
3146                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3147                                                                 s) == 0) 
3148                         { /* check failed */
3149                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3150                         goto f_err;
3151                         }
3152                 else 
3153                         {
3154                         return 1;
3155                         }
3156                 }
3157 #endif
3158         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3159         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3160         EVP_PKEY_free(pkey);
3161
3162         
3163         /* Check that we have a certificate if we require one */
3164         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3165                 {
3166                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3167                 goto f_err;
3168                 }
3169 #ifndef OPENSSL_NO_DSA
3170         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3171                 {
3172                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3173                 goto f_err;
3174                 }
3175 #endif
3176 #ifndef OPENSSL_NO_RSA
3177         if ((alg_k & SSL_kRSA) &&
3178                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3179                 {
3180                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3181                 goto f_err;
3182                 }
3183 #endif
3184 #ifndef OPENSSL_NO_DH
3185         if ((alg_k & SSL_kEDH) &&
3186                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3187                 {
3188                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3189                 goto f_err;
3190                 }
3191         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3192                 {
3193                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3194                 goto f_err;
3195                 }
3196 #ifndef OPENSSL_NO_DSA
3197         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3198                 {
3199                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3200                 goto f_err;
3201                 }
3202 #endif
3203 #endif
3204
3205         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3206                 {
3207 #ifndef OPENSSL_NO_RSA
3208                 if (alg_k & SSL_kRSA)
3209                         {
3210                         if (rsa == NULL
3211                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3212                                 {
3213                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3214                                 goto f_err;
3215                                 }
3216                         }
3217                 else
3218 #endif
3219 #ifndef OPENSSL_NO_DH
3220                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3221                             {
3222                             if (dh == NULL
3223                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3224                                 {
3225                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3226                                 goto f_err;
3227                                 }
3228                         }
3229                 else
3230 #endif
3231                         {
3232                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3233                         goto f_err;
3234                         }
3235                 }
3236         return(1);
3237 f_err:
3238         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3239 err:
3240         return(0);
3241         }
3242
3243 /* Check to see if handshake is full or resumed. Usually this is just a
3244  * case of checking to see if a cache hit has occurred. In the case of
3245  * session tickets we have to check the next message to be sure.
3246  */
3247
3248 #ifndef OPENSSL_NO_TLSEXT
3249 # ifndef OPENSSL_NO_NEXTPROTONEG
3250 int ssl3_send_next_proto(SSL *s)
3251         {
3252         unsigned int len, padding_len;
3253         unsigned char *d;
3254
3255         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3256                 {
3257                 len = s->next_proto_negotiated_len;
3258                 padding_len = 32 - ((len + 2) % 32);
3259                 d = (unsigned char *)s->init_buf->data;
3260                 d[4] = len;
3261                 memcpy(d + 5, s->next_proto_negotiated, len);
3262                 d[5 + len] = padding_len;
3263                 memset(d + 6 + len, 0, padding_len);
3264                 *(d++)=SSL3_MT_NEXT_PROTO;
3265                 l2n3(2 + len + padding_len, d);
3266                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3267                 s->init_num = 4 + 2 + len + padding_len;
3268                 s->init_off = 0;
3269                 }
3270
3271         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3272         }
3273 # endif
3274
3275 int ssl3_check_finished(SSL *s)
3276         {
3277         int ok;
3278         long n;
3279         /* If we have no ticket it cannot be a resumed session. */
3280         if (!s->session->tlsext_tick)
3281                 return 1;
3282         /* this function is called when we really expect a Certificate
3283          * message, so permit appropriate message length */
3284         n=s->method->ssl_get_message(s,
3285                 SSL3_ST_CR_CERT_A,
3286                 SSL3_ST_CR_CERT_B,
3287                 -1,
3288                 s->max_cert_list,
3289                 &ok);
3290         if (!ok) return((int)n);
3291         s->s3->tmp.reuse_message = 1;
3292         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3293                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3294                 return 2;
3295
3296         return 1;
3297         }
3298 #endif
3299
3300 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3301         {
3302         int i = 0;
3303 #ifndef OPENSSL_NO_ENGINE
3304         if (s->ctx->client_cert_engine)
3305                 {
3306                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3307                                                 SSL_get_client_CA_list(s),
3308                                                 px509, ppkey, NULL, NULL, NULL);
3309                 if (i != 0)
3310                         return i;
3311                 }
3312 #endif
3313         if (s->ctx->client_cert_cb)
3314                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3315         return i;
3316         }