PR: 1833
[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 "ssl_locl.h"
153 #include "kssl_lcl.h"
154 #include <openssl/buffer.h>
155 #include <openssl/rand.h>
156 #include <openssl/objects.h>
157 #include <openssl/evp.h>
158 #include <openssl/md5.h>
159 #ifndef OPENSSL_NO_DH
160 #include <openssl/dh.h>
161 #endif
162 #include <openssl/bn.h>
163 #ifndef OPENSSL_NO_ENGINE
164 #include <openssl/engine.h>
165 #endif
166
167 static const SSL_METHOD *ssl3_get_client_method(int ver);
168 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
169
170 static const SSL_METHOD *ssl3_get_client_method(int ver)
171         {
172         if (ver == SSL3_VERSION)
173                 return(SSLv3_client_method());
174         else
175                 return(NULL);
176         }
177
178 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
179                         ssl_undefined_function,
180                         ssl3_connect,
181                         ssl3_get_client_method)
182
183 int ssl3_connect(SSL *s)
184         {
185         BUF_MEM *buf=NULL;
186         unsigned long Time=(unsigned long)time(NULL);
187         void (*cb)(const SSL *ssl,int type,int val)=NULL;
188         int ret= -1;
189         int new_state,state,skip=0;
190
191         RAND_add(&Time,sizeof(Time),0);
192         ERR_clear_error();
193         clear_sys_error();
194
195         if (s->info_callback != NULL)
196                 cb=s->info_callback;
197         else if (s->ctx->info_callback != NULL)
198                 cb=s->ctx->info_callback;
199         
200         s->in_handshake++;
201         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
202
203         for (;;)
204                 {
205                 state=s->state;
206
207                 switch(s->state)
208                         {
209                 case SSL_ST_RENEGOTIATE:
210                         s->new_session=1;
211                         s->state=SSL_ST_CONNECT;
212                         s->ctx->stats.sess_connect_renegotiate++;
213                         /* break */
214                 case SSL_ST_BEFORE:
215                 case SSL_ST_CONNECT:
216                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
217                 case SSL_ST_OK|SSL_ST_CONNECT:
218
219                         s->server=0;
220                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
221
222                         if ((s->version & 0xff00 ) != 0x0300)
223                                 {
224                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
225                                 ret = -1;
226                                 goto end;
227                                 }
228                                 
229                         /* s->version=SSL3_VERSION; */
230                         s->type=SSL_ST_CONNECT;
231
232                         if (s->init_buf == NULL)
233                                 {
234                                 if ((buf=BUF_MEM_new()) == NULL)
235                                         {
236                                         ret= -1;
237                                         goto end;
238                                         }
239                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
240                                         {
241                                         ret= -1;
242                                         goto end;
243                                         }
244                                 s->init_buf=buf;
245                                 buf=NULL;
246                                 }
247
248                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
249
250                         /* setup buffing BIO */
251                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
252
253                         /* don't push the buffering BIO quite yet */
254
255                         ssl3_init_finished_mac(s);
256
257                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
258                         s->ctx->stats.sess_connect++;
259                         s->init_num=0;
260                         break;
261
262                 case SSL3_ST_CW_CLNT_HELLO_A:
263                 case SSL3_ST_CW_CLNT_HELLO_B:
264
265                         s->shutdown=0;
266                         ret=ssl3_client_hello(s);
267                         if (ret <= 0) goto end;
268                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
269                         s->init_num=0;
270
271                         /* turn on buffering for the next lot of output */
272                         if (s->bbio != s->wbio)
273                                 s->wbio=BIO_push(s->bbio,s->wbio);
274
275                         break;
276
277                 case SSL3_ST_CR_SRVR_HELLO_A:
278                 case SSL3_ST_CR_SRVR_HELLO_B:
279                         ret=ssl3_get_server_hello(s);
280                         if (ret <= 0) goto end;
281
282                         if (s->hit)
283                                 s->state=SSL3_ST_CR_FINISHED_A;
284                         else
285                                 s->state=SSL3_ST_CR_CERT_A;
286                         s->init_num=0;
287                         break;
288
289                 case SSL3_ST_CR_CERT_A:
290                 case SSL3_ST_CR_CERT_B:
291 #ifndef OPENSSL_NO_TLSEXT
292                         ret=ssl3_check_finished(s);
293                         if (ret <= 0) goto end;
294                         if (ret == 2)
295                                 {
296                                 s->hit = 1;
297                                 if (s->tlsext_ticket_expected)
298                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
299                                 else
300                                         s->state=SSL3_ST_CR_FINISHED_A;
301                                 s->init_num=0;
302                                 break;
303                                 }
304 #endif
305                         /* Check if it is anon DH/ECDH */
306                         /* or PSK */
307                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
308                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
309                                 {
310                                 ret=ssl3_get_server_certificate(s);
311                                 if (ret <= 0) goto end;
312 #ifndef OPENSSL_NO_TLSEXT
313                                 if (s->tlsext_status_expected)
314                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
315                                 else
316                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
317                                 }
318                         else
319                                 {
320                                 skip = 1;
321                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
322                                 }
323 #else
324                                 }
325                         else
326                                 skip=1;
327
328                         s->state=SSL3_ST_CR_KEY_EXCH_A;
329 #endif
330                         s->init_num=0;
331                         break;
332
333                 case SSL3_ST_CR_KEY_EXCH_A:
334                 case SSL3_ST_CR_KEY_EXCH_B:
335                         ret=ssl3_get_key_exchange(s);
336                         if (ret <= 0) goto end;
337                         s->state=SSL3_ST_CR_CERT_REQ_A;
338                         s->init_num=0;
339
340                         /* at this point we check that we have the
341                          * required stuff from the server */
342                         if (!ssl3_check_cert_and_algorithm(s))
343                                 {
344                                 ret= -1;
345                                 goto end;
346                                 }
347                         break;
348
349                 case SSL3_ST_CR_CERT_REQ_A:
350                 case SSL3_ST_CR_CERT_REQ_B:
351                         ret=ssl3_get_certificate_request(s);
352                         if (ret <= 0) goto end;
353                         s->state=SSL3_ST_CR_SRVR_DONE_A;
354                         s->init_num=0;
355                         break;
356
357                 case SSL3_ST_CR_SRVR_DONE_A:
358                 case SSL3_ST_CR_SRVR_DONE_B:
359                         ret=ssl3_get_server_done(s);
360                         if (ret <= 0) goto end;
361                         if (s->s3->tmp.cert_req)
362                                 s->state=SSL3_ST_CW_CERT_A;
363                         else
364                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
365                         s->init_num=0;
366
367                         break;
368
369                 case SSL3_ST_CW_CERT_A:
370                 case SSL3_ST_CW_CERT_B:
371                 case SSL3_ST_CW_CERT_C:
372                 case SSL3_ST_CW_CERT_D:
373                         ret=ssl3_send_client_certificate(s);
374                         if (ret <= 0) goto end;
375                         s->state=SSL3_ST_CW_KEY_EXCH_A;
376                         s->init_num=0;
377                         break;
378
379                 case SSL3_ST_CW_KEY_EXCH_A:
380                 case SSL3_ST_CW_KEY_EXCH_B:
381                         ret=ssl3_send_client_key_exchange(s);
382                         if (ret <= 0) goto end;
383                         /* EAY EAY EAY need to check for DH fix cert
384                          * sent back */
385                         /* For TLS, cert_req is set to 2, so a cert chain
386                          * of nothing is sent, but no verify packet is sent */
387                         /* XXX: For now, we do not support client 
388                          * authentication in ECDH cipher suites with
389                          * ECDH (rather than ECDSA) certificates.
390                          * We need to skip the certificate verify 
391                          * message when client's ECDH public key is sent 
392                          * inside the client certificate.
393                          */
394                         if (s->s3->tmp.cert_req == 1)
395                                 {
396                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
397                                 }
398                         else
399                                 {
400                                 s->state=SSL3_ST_CW_CHANGE_A;
401                                 s->s3->change_cipher_spec=0;
402                                 }
403                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
404                                 {
405                                 s->state=SSL3_ST_CW_CHANGE_A;
406                                 s->s3->change_cipher_spec=0;
407                                 }
408
409                         s->init_num=0;
410                         break;
411
412                 case SSL3_ST_CW_CERT_VRFY_A:
413                 case SSL3_ST_CW_CERT_VRFY_B:
414                         ret=ssl3_send_client_verify(s);
415                         if (ret <= 0) goto end;
416                         s->state=SSL3_ST_CW_CHANGE_A;
417                         s->init_num=0;
418                         s->s3->change_cipher_spec=0;
419                         break;
420
421                 case SSL3_ST_CW_CHANGE_A:
422                 case SSL3_ST_CW_CHANGE_B:
423                         ret=ssl3_send_change_cipher_spec(s,
424                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
425                         if (ret <= 0) goto end;
426                         s->state=SSL3_ST_CW_FINISHED_A;
427                         s->init_num=0;
428
429                         s->session->cipher=s->s3->tmp.new_cipher;
430 #ifdef OPENSSL_NO_COMP
431                         s->session->compress_meth=0;
432 #else
433                         if (s->s3->tmp.new_compression == NULL)
434                                 s->session->compress_meth=0;
435                         else
436                                 s->session->compress_meth=
437                                         s->s3->tmp.new_compression->id;
438 #endif
439                         if (!s->method->ssl3_enc->setup_key_block(s))
440                                 {
441                                 ret= -1;
442                                 goto end;
443                                 }
444
445                         if (!s->method->ssl3_enc->change_cipher_state(s,
446                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
447                                 {
448                                 ret= -1;
449                                 goto end;
450                                 }
451
452                         break;
453
454                 case SSL3_ST_CW_FINISHED_A:
455                 case SSL3_ST_CW_FINISHED_B:
456                         ret=ssl3_send_finished(s,
457                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
458                                 s->method->ssl3_enc->client_finished_label,
459                                 s->method->ssl3_enc->client_finished_label_len);
460                         if (ret <= 0) goto end;
461                         s->state=SSL3_ST_CW_FLUSH;
462
463                         /* clear flags */
464                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
465                         if (s->hit)
466                                 {
467                                 s->s3->tmp.next_state=SSL_ST_OK;
468                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
469                                         {
470                                         s->state=SSL_ST_OK;
471                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
472                                         s->s3->delay_buf_pop_ret=0;
473                                         }
474                                 }
475                         else
476                                 {
477 #ifndef OPENSSL_NO_TLSEXT
478                                 /* Allow NewSessionTicket if ticket expected */
479                                 if (s->tlsext_ticket_expected)
480                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
481                                 else
482 #endif
483                                 
484                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
485                                 }
486                         s->init_num=0;
487                         break;
488
489 #ifndef OPENSSL_NO_TLSEXT
490                 case SSL3_ST_CR_SESSION_TICKET_A:
491                 case SSL3_ST_CR_SESSION_TICKET_B:
492                         ret=ssl3_get_new_session_ticket(s);
493                         if (ret <= 0) goto end;
494                         s->state=SSL3_ST_CR_FINISHED_A;
495                         s->init_num=0;
496                 break;
497
498                 case SSL3_ST_CR_CERT_STATUS_A:
499                 case SSL3_ST_CR_CERT_STATUS_B:
500                         ret=ssl3_get_cert_status(s);
501                         if (ret <= 0) goto end;
502                         s->state=SSL3_ST_CR_KEY_EXCH_A;
503                         s->init_num=0;
504                 break;
505 #endif
506
507                 case SSL3_ST_CR_FINISHED_A:
508                 case SSL3_ST_CR_FINISHED_B:
509
510                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
511                                 SSL3_ST_CR_FINISHED_B);
512                         if (ret <= 0) goto end;
513
514                         if (s->hit)
515                                 s->state=SSL3_ST_CW_CHANGE_A;
516                         else
517                                 s->state=SSL_ST_OK;
518                         s->init_num=0;
519                         break;
520
521                 case SSL3_ST_CW_FLUSH:
522                         s->rwstate=SSL_WRITING;
523                         if (BIO_flush(s->wbio) <= 0)
524                                 {
525                                 ret= -1;
526                                 goto end;
527                                 }
528                         s->rwstate=SSL_NOTHING;
529                         s->state=s->s3->tmp.next_state;
530                         break;
531
532                 case SSL_ST_OK:
533                         /* clean a few things up */
534                         ssl3_cleanup_key_block(s);
535
536                         if (s->init_buf != NULL)
537                                 {
538                                 BUF_MEM_free(s->init_buf);
539                                 s->init_buf=NULL;
540                                 }
541
542                         /* If we are not 'joining' the last two packets,
543                          * remove the buffering now */
544                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
545                                 ssl_free_wbio_buffer(s);
546                         /* else do it later in ssl3_write */
547
548                         s->init_num=0;
549                         s->new_session=0;
550
551                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
552                         if (s->hit) s->ctx->stats.sess_hit++;
553
554                         ret=1;
555                         /* s->server=0; */
556                         s->handshake_func=ssl3_connect;
557                         s->ctx->stats.sess_connect_good++;
558
559                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
560
561                         goto end;
562                         /* break; */
563                         
564                 default:
565                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
566                         ret= -1;
567                         goto end;
568                         /* break; */
569                         }
570
571                 /* did we do anything */
572                 if (!s->s3->tmp.reuse_message && !skip)
573                         {
574                         if (s->debug)
575                                 {
576                                 if ((ret=BIO_flush(s->wbio)) <= 0)
577                                         goto end;
578                                 }
579
580                         if ((cb != NULL) && (s->state != state))
581                                 {
582                                 new_state=s->state;
583                                 s->state=state;
584                                 cb(s,SSL_CB_CONNECT_LOOP,1);
585                                 s->state=new_state;
586                                 }
587                         }
588                 skip=0;
589                 }
590 end:
591         s->in_handshake--;
592         if (buf != NULL)
593                 BUF_MEM_free(buf);
594         if (cb != NULL)
595                 cb(s,SSL_CB_CONNECT_EXIT,ret);
596         return(ret);
597         }
598
599
600 int ssl3_client_hello(SSL *s)
601         {
602         unsigned char *buf;
603         unsigned char *p,*d;
604         int i;
605         unsigned long Time,l;
606 #ifndef OPENSSL_NO_COMP
607         int j;
608         SSL_COMP *comp;
609 #endif
610
611         buf=(unsigned char *)s->init_buf->data;
612         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
613                 {
614                 SSL_SESSION *sess = s->session;
615                 if ((sess == NULL) ||
616                         (sess->ssl_version != s->version) ||
617 #ifdef OPENSSL_NO_TLSEXT
618                         !sess->session_id_length ||
619 #else
620                         (!sess->session_id_length && !sess->tlsext_tick) ||
621 #endif
622                         (sess->not_resumable))
623                         {
624                         if (!ssl_get_new_session(s,0))
625                                 goto err;
626                         }
627                 /* else use the pre-loaded session */
628
629                 p=s->s3->client_random;
630                 Time=(unsigned long)time(NULL);                 /* Time */
631                 l2n(Time,p);
632                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
633                         goto err;
634
635                 /* Do the message type and length last */
636                 d=p= &(buf[4]);
637
638                 *(p++)=s->version>>8;
639                 *(p++)=s->version&0xff;
640                 s->client_version=s->version;
641
642                 /* Random stuff */
643                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
644                 p+=SSL3_RANDOM_SIZE;
645
646                 /* Session ID */
647                 if (s->new_session)
648                         i=0;
649                 else
650                         i=s->session->session_id_length;
651                 *(p++)=i;
652                 if (i != 0)
653                         {
654                         if (i > (int)sizeof(s->session->session_id))
655                                 {
656                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
657                                 goto err;
658                                 }
659                         memcpy(p,s->session->session_id,i);
660                         p+=i;
661                         }
662                 
663                 /* Ciphers supported */
664                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
665                 if (i == 0)
666                         {
667                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
668                         goto err;
669                         }
670                 s2n(i,p);
671                 p+=i;
672
673                 /* COMPRESSION */
674 #ifdef OPENSSL_NO_COMP
675                 *(p++)=1;
676 #else
677
678                 if ((s->options & SSL_OP_NO_COMPRESSION)
679                                         || !s->ctx->comp_methods)
680                         j=0;
681                 else
682                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
683                 *(p++)=1+j;
684                 for (i=0; i<j; i++)
685                         {
686                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
687                         *(p++)=comp->id;
688                         }
689 #endif
690                 *(p++)=0; /* Add the NULL method */
691
692 #ifndef OPENSSL_NO_TLSEXT
693                 /* TLS extensions*/
694                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
695                         {
696                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
697                         goto err;
698                         }
699                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
700                         {
701                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
702                         goto err;
703                         }
704 #endif
705                 
706                 l=(p-d);
707                 d=buf;
708                 *(d++)=SSL3_MT_CLIENT_HELLO;
709                 l2n3(l,d);
710
711                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
712                 /* number of bytes to write */
713                 s->init_num=p-buf;
714                 s->init_off=0;
715                 }
716
717         /* SSL3_ST_CW_CLNT_HELLO_B */
718         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
719 err:
720         return(-1);
721         }
722
723 int ssl3_get_server_hello(SSL *s)
724         {
725         STACK_OF(SSL_CIPHER) *sk;
726         const SSL_CIPHER *c;
727         unsigned char *p,*d;
728         int i,al,ok;
729         unsigned int j;
730         long n;
731 #ifndef OPENSSL_NO_COMP
732         SSL_COMP *comp;
733 #endif
734
735         n=s->method->ssl_get_message(s,
736                 SSL3_ST_CR_SRVR_HELLO_A,
737                 SSL3_ST_CR_SRVR_HELLO_B,
738                 -1,
739                 20000, /* ?? */
740                 &ok);
741
742         if (!ok) return((int)n);
743
744         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
745                 {
746                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
747                         {
748                         if ( s->d1->send_cookie == 0)
749                                 {
750                                 s->s3->tmp.reuse_message = 1;
751                                 return 1;
752                                 }
753                         else /* already sent a cookie */
754                                 {
755                                 al=SSL_AD_UNEXPECTED_MESSAGE;
756                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
757                                 goto f_err;
758                                 }
759                         }
760                 }
761         
762         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
763                 {
764                 al=SSL_AD_UNEXPECTED_MESSAGE;
765                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
766                 goto f_err;
767                 }
768
769         d=p=(unsigned char *)s->init_msg;
770
771         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
772                 {
773                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
774                 s->version=(s->version&0xff00)|p[1];
775                 al=SSL_AD_PROTOCOL_VERSION;
776                 goto f_err;
777                 }
778         p+=2;
779
780         /* load the server hello data */
781         /* load the server random */
782         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
783         p+=SSL3_RANDOM_SIZE;
784
785         /* get the session-id */
786         j= *(p++);
787
788         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
789                 {
790                 al=SSL_AD_ILLEGAL_PARAMETER;
791                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
792                 goto f_err;
793                 }
794
795 #ifndef OPENSSL_NO_TLSEXT
796         /* check if we want to resume the session based on external pre-shared secret */
797         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
798                 {
799                 SSL_CIPHER *pref_cipher=NULL;
800                 s->session->master_key_length=sizeof(s->session->master_key);
801                 if (s->tls_session_secret_cb(s, s->session->master_key,
802                                              &s->session->master_key_length,
803                                              NULL, &pref_cipher,
804                                              s->tls_session_secret_cb_arg))
805                         {
806                         s->session->cipher = pref_cipher ?
807                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
808                         }
809                 }
810 #endif /* OPENSSL_NO_TLSEXT */
811
812         if (j != 0 && j == s->session->session_id_length
813             && memcmp(p,s->session->session_id,j) == 0)
814             {
815             if(s->sid_ctx_length != s->session->sid_ctx_length
816                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
817                 {
818                 /* actually a client application bug */
819                 al=SSL_AD_ILLEGAL_PARAMETER;
820                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
821                 goto f_err;
822                 }
823             s->hit=1;
824             }
825         else    /* a miss or crap from the other end */
826                 {
827                 /* If we were trying for session-id reuse, make a new
828                  * SSL_SESSION so we don't stuff up other people */
829                 s->hit=0;
830                 if (s->session->session_id_length > 0)
831                         {
832                         if (!ssl_get_new_session(s,0))
833                                 {
834                                 al=SSL_AD_INTERNAL_ERROR;
835                                 goto f_err;
836                                 }
837                         }
838                 s->session->session_id_length=j;
839                 memcpy(s->session->session_id,p,j); /* j could be 0 */
840                 }
841         p+=j;
842         c=ssl_get_cipher_by_char(s,p);
843         if (c == NULL)
844                 {
845                 /* unknown cipher */
846                 al=SSL_AD_ILLEGAL_PARAMETER;
847                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
848                 goto f_err;
849                 }
850         p+=ssl_put_cipher_by_char(s,NULL,NULL);
851
852         sk=ssl_get_ciphers_by_id(s);
853         i=sk_SSL_CIPHER_find(sk,c);
854         if (i < 0)
855                 {
856                 /* we did not say we would use this cipher */
857                 al=SSL_AD_ILLEGAL_PARAMETER;
858                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
859                 goto f_err;
860                 }
861
862         /* Depending on the session caching (internal/external), the cipher
863            and/or cipher_id values may not be set. Make sure that
864            cipher_id is set and use it for comparison. */
865         if (s->session->cipher)
866                 s->session->cipher_id = s->session->cipher->id;
867         if (s->hit && (s->session->cipher_id != c->id))
868                 {
869                 if (!(s->options &
870                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
871                         {
872                         al=SSL_AD_ILLEGAL_PARAMETER;
873                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
874                         goto f_err;
875                         }
876                 }
877         s->s3->tmp.new_cipher=c;
878         if (!ssl3_digest_cached_records(s))
879                 goto f_err;
880
881         /* lets get the compression algorithm */
882         /* COMPRESSION */
883 #ifdef OPENSSL_NO_COMP
884         if (*(p++) != 0)
885                 {
886                 al=SSL_AD_ILLEGAL_PARAMETER;
887                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
888                 goto f_err;
889                 }
890         /* If compression is disabled we'd better not try to resume a session
891          * using compression.
892          */
893         if (s->session->compress_meth != 0)
894                 {
895                 al=SSL_AD_INTERNAL_ERROR;
896                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
897                 goto f_err;
898                 }
899 #else
900         j= *(p++);
901         if (s->hit && j != s->session->compress_meth)
902                 {
903                 al=SSL_AD_ILLEGAL_PARAMETER;
904                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
905                 goto f_err;
906                 }
907         if (j == 0)
908                 comp=NULL;
909         else if (s->options & SSL_OP_NO_COMPRESSION)
910                 {
911                 al=SSL_AD_ILLEGAL_PARAMETER;
912                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
913                 goto f_err;
914                 }
915         else
916                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
917         
918         if ((j != 0) && (comp == NULL))
919                 {
920                 al=SSL_AD_ILLEGAL_PARAMETER;
921                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
922                 goto f_err;
923                 }
924         else
925                 {
926                 s->s3->tmp.new_compression=comp;
927                 }
928 #endif
929
930 #ifndef OPENSSL_NO_TLSEXT
931         /* TLS extensions*/
932         if (s->version >= SSL3_VERSION)
933                 {
934                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
935                         {
936                         /* 'al' set by ssl_parse_serverhello_tlsext */
937                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
938                         goto f_err; 
939                         }
940                 if (ssl_check_serverhello_tlsext(s) <= 0)
941                         {
942                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
943                                 goto err;
944                         }
945                 }
946 #endif
947
948         if (p != (d+n))
949                 {
950                 /* wrong packet length */
951                 al=SSL_AD_DECODE_ERROR;
952                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
953                 goto err;
954                 }
955
956         return(1);
957 f_err:
958         ssl3_send_alert(s,SSL3_AL_FATAL,al);
959 err:
960         return(-1);
961         }
962
963 int ssl3_get_server_certificate(SSL *s)
964         {
965         int al,i,ok,ret= -1;
966         unsigned long n,nc,llen,l;
967         X509 *x=NULL;
968         const unsigned char *q,*p;
969         unsigned char *d;
970         STACK_OF(X509) *sk=NULL;
971         SESS_CERT *sc;
972         EVP_PKEY *pkey=NULL;
973         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
974
975         n=s->method->ssl_get_message(s,
976                 SSL3_ST_CR_CERT_A,
977                 SSL3_ST_CR_CERT_B,
978                 -1,
979                 s->max_cert_list,
980                 &ok);
981
982         if (!ok) return((int)n);
983
984         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
985                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 
986                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
987                 {
988                 s->s3->tmp.reuse_message=1;
989                 return(1);
990                 }
991
992         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
993                 {
994                 al=SSL_AD_UNEXPECTED_MESSAGE;
995                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
996                 goto f_err;
997                 }
998         p=d=(unsigned char *)s->init_msg;
999
1000         if ((sk=sk_X509_new_null()) == NULL)
1001                 {
1002                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1003                 goto err;
1004                 }
1005
1006         n2l3(p,llen);
1007         if (llen+3 != n)
1008                 {
1009                 al=SSL_AD_DECODE_ERROR;
1010                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1011                 goto f_err;
1012                 }
1013         for (nc=0; nc<llen; )
1014                 {
1015                 n2l3(p,l);
1016                 if ((l+nc+3) > llen)
1017                         {
1018                         al=SSL_AD_DECODE_ERROR;
1019                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1020                         goto f_err;
1021                         }
1022
1023                 q=p;
1024                 x=d2i_X509(NULL,&q,l);
1025                 if (x == NULL)
1026                         {
1027                         al=SSL_AD_BAD_CERTIFICATE;
1028                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1029                         goto f_err;
1030                         }
1031                 if (q != (p+l))
1032                         {
1033                         al=SSL_AD_DECODE_ERROR;
1034                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1035                         goto f_err;
1036                         }
1037                 if (!sk_X509_push(sk,x))
1038                         {
1039                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1040                         goto err;
1041                         }
1042                 x=NULL;
1043                 nc+=l+3;
1044                 p=q;
1045                 }
1046
1047         i=ssl_verify_cert_chain(s,sk);
1048         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1049 #ifndef OPENSSL_NO_KRB5
1050             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1051                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1052 #endif /* OPENSSL_NO_KRB5 */
1053                 )
1054                 {
1055                 al=ssl_verify_alarm_type(s->verify_result);
1056                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1057                 goto f_err; 
1058                 }
1059         ERR_clear_error(); /* but we keep s->verify_result */
1060
1061         sc=ssl_sess_cert_new();
1062         if (sc == NULL) goto err;
1063
1064         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1065         s->session->sess_cert=sc;
1066
1067         sc->cert_chain=sk;
1068         /* Inconsistency alert: cert_chain does include the peer's
1069          * certificate, which we don't include in s3_srvr.c */
1070         x=sk_X509_value(sk,0);
1071         sk=NULL;
1072         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1073
1074         pkey=X509_get_pubkey(x);
1075
1076         /* VRS: allow null cert if auth == KRB5 */
1077         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1078                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1079                     ? 0 : 1;
1080
1081 #ifdef KSSL_DEBUG
1082         printf("pkey,x = %p, %p\n", pkey,x);
1083         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1084         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1085                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1086 #endif    /* KSSL_DEBUG */
1087
1088         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1089                 {
1090                 x=NULL;
1091                 al=SSL3_AL_FATAL;
1092                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1093                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1094                 goto f_err;
1095                 }
1096
1097         i=ssl_cert_type(x,pkey);
1098         if (need_cert && i < 0)
1099                 {
1100                 x=NULL;
1101                 al=SSL3_AL_FATAL;
1102                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1103                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1104                 goto f_err;
1105                 }
1106
1107         if (need_cert)
1108                 {
1109                 sc->peer_cert_type=i;
1110                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1111                 /* Why would the following ever happen?
1112                  * We just created sc a couple of lines ago. */
1113                 if (sc->peer_pkeys[i].x509 != NULL)
1114                         X509_free(sc->peer_pkeys[i].x509);
1115                 sc->peer_pkeys[i].x509=x;
1116                 sc->peer_key= &(sc->peer_pkeys[i]);
1117
1118                 if (s->session->peer != NULL)
1119                         X509_free(s->session->peer);
1120                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1121                 s->session->peer=x;
1122                 }
1123         else
1124                 {
1125                 sc->peer_cert_type=i;
1126                 sc->peer_key= NULL;
1127
1128                 if (s->session->peer != NULL)
1129                         X509_free(s->session->peer);
1130                 s->session->peer=NULL;
1131                 }
1132         s->session->verify_result = s->verify_result;
1133
1134         x=NULL;
1135         ret=1;
1136
1137         if (0)
1138                 {
1139 f_err:
1140                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1141                 }
1142 err:
1143         EVP_PKEY_free(pkey);
1144         X509_free(x);
1145         sk_X509_pop_free(sk,X509_free);
1146         return(ret);
1147         }
1148
1149 int ssl3_get_key_exchange(SSL *s)
1150         {
1151 #ifndef OPENSSL_NO_RSA
1152         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1153 #endif
1154         EVP_MD_CTX md_ctx;
1155         unsigned char *param,*p;
1156         int al,i,j,param_len,ok;
1157         long n,alg_k,alg_a;
1158         EVP_PKEY *pkey=NULL;
1159 #ifndef OPENSSL_NO_RSA
1160         RSA *rsa=NULL;
1161 #endif
1162 #ifndef OPENSSL_NO_DH
1163         DH *dh=NULL;
1164 #endif
1165 #ifndef OPENSSL_NO_ECDH
1166         EC_KEY *ecdh = NULL;
1167         BN_CTX *bn_ctx = NULL;
1168         EC_POINT *srvr_ecpoint = NULL;
1169         int curve_nid = 0;
1170         int encoded_pt_len = 0;
1171 #endif
1172
1173         /* use same message size as in ssl3_get_certificate_request()
1174          * as ServerKeyExchange message may be skipped */
1175         n=s->method->ssl_get_message(s,
1176                 SSL3_ST_CR_KEY_EXCH_A,
1177                 SSL3_ST_CR_KEY_EXCH_B,
1178                 -1,
1179                 s->max_cert_list,
1180                 &ok);
1181         if (!ok) return((int)n);
1182
1183         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1184                 {
1185 #ifndef OPENSSL_NO_PSK
1186                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1187                    omitted if no identity hint is sent. Set
1188                    session->sess_cert anyway to avoid problems
1189                    later.*/
1190                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1191                         {
1192                         s->session->sess_cert=ssl_sess_cert_new();
1193                         if (s->ctx->psk_identity_hint)
1194                                 OPENSSL_free(s->ctx->psk_identity_hint);
1195                         s->ctx->psk_identity_hint = NULL;
1196                         }
1197 #endif
1198                 s->s3->tmp.reuse_message=1;
1199                 return(1);
1200                 }
1201
1202         param=p=(unsigned char *)s->init_msg;
1203         if (s->session->sess_cert != NULL)
1204                 {
1205 #ifndef OPENSSL_NO_RSA
1206                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1207                         {
1208                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1209                         s->session->sess_cert->peer_rsa_tmp=NULL;
1210                         }
1211 #endif
1212 #ifndef OPENSSL_NO_DH
1213                 if (s->session->sess_cert->peer_dh_tmp)
1214                         {
1215                         DH_free(s->session->sess_cert->peer_dh_tmp);
1216                         s->session->sess_cert->peer_dh_tmp=NULL;
1217                         }
1218 #endif
1219 #ifndef OPENSSL_NO_ECDH
1220                 if (s->session->sess_cert->peer_ecdh_tmp)
1221                         {
1222                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1223                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1224                         }
1225 #endif
1226                 }
1227         else
1228                 {
1229                 s->session->sess_cert=ssl_sess_cert_new();
1230                 }
1231
1232         param_len=0;
1233         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1234         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1235         EVP_MD_CTX_init(&md_ctx);
1236
1237 #ifndef OPENSSL_NO_PSK
1238         if (alg_k & SSL_kPSK)
1239                 {
1240                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1241
1242                 al=SSL_AD_HANDSHAKE_FAILURE;
1243                 n2s(p,i);
1244                 param_len=i+2;
1245                 /* Store PSK identity hint for later use, hint is used
1246                  * in ssl3_send_client_key_exchange.  Assume that the
1247                  * maximum length of a PSK identity hint can be as
1248                  * long as the maximum length of a PSK identity. */
1249                 if (i > PSK_MAX_IDENTITY_LEN)
1250                         {
1251                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1252                                 SSL_R_DATA_LENGTH_TOO_LONG);
1253                         goto f_err;
1254                         }
1255                 if (param_len > n)
1256                         {
1257                         al=SSL_AD_DECODE_ERROR;
1258                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1259                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1260                         goto f_err;
1261                         }
1262                 /* If received PSK identity hint contains NULL
1263                  * characters, the hint is truncated from the first
1264                  * NULL. p may not be ending with NULL, so create a
1265                  * NULL-terminated string. */
1266                 memcpy(tmp_id_hint, p, i);
1267                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1268                 if (s->ctx->psk_identity_hint != NULL)
1269                         OPENSSL_free(s->ctx->psk_identity_hint);
1270                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1271                 if (s->ctx->psk_identity_hint == NULL)
1272                         {
1273                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1274                         goto f_err;
1275                         }          
1276
1277                 p+=i;
1278                 n-=param_len;
1279                 }
1280         else
1281 #endif /* !OPENSSL_NO_PSK */
1282 #ifndef OPENSSL_NO_RSA
1283         if (alg_k & SSL_kRSA)
1284                 {
1285                 if ((rsa=RSA_new()) == NULL)
1286                         {
1287                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1288                         goto err;
1289                         }
1290                 n2s(p,i);
1291                 param_len=i+2;
1292                 if (param_len > n)
1293                         {
1294                         al=SSL_AD_DECODE_ERROR;
1295                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1296                         goto f_err;
1297                         }
1298                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1299                         {
1300                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1301                         goto err;
1302                         }
1303                 p+=i;
1304
1305                 n2s(p,i);
1306                 param_len+=i+2;
1307                 if (param_len > n)
1308                         {
1309                         al=SSL_AD_DECODE_ERROR;
1310                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1311                         goto f_err;
1312                         }
1313                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1314                         {
1315                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1316                         goto err;
1317                         }
1318                 p+=i;
1319                 n-=param_len;
1320
1321                 /* this should be because we are using an export cipher */
1322                 if (alg_a & SSL_aRSA)
1323                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1324                 else
1325                         {
1326                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1327                         goto err;
1328                         }
1329                 s->session->sess_cert->peer_rsa_tmp=rsa;
1330                 rsa=NULL;
1331                 }
1332 #else /* OPENSSL_NO_RSA */
1333         if (0)
1334                 ;
1335 #endif
1336 #ifndef OPENSSL_NO_DH
1337         else if (alg_k & SSL_kEDH)
1338                 {
1339                 if ((dh=DH_new()) == NULL)
1340                         {
1341                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1342                         goto err;
1343                         }
1344                 n2s(p,i);
1345                 param_len=i+2;
1346                 if (param_len > n)
1347                         {
1348                         al=SSL_AD_DECODE_ERROR;
1349                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1350                         goto f_err;
1351                         }
1352                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1353                         {
1354                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1355                         goto err;
1356                         }
1357                 p+=i;
1358
1359                 n2s(p,i);
1360                 param_len+=i+2;
1361                 if (param_len > n)
1362                         {
1363                         al=SSL_AD_DECODE_ERROR;
1364                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1365                         goto f_err;
1366                         }
1367                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1368                         {
1369                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1370                         goto err;
1371                         }
1372                 p+=i;
1373
1374                 n2s(p,i);
1375                 param_len+=i+2;
1376                 if (param_len > n)
1377                         {
1378                         al=SSL_AD_DECODE_ERROR;
1379                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1380                         goto f_err;
1381                         }
1382                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1383                         {
1384                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1385                         goto err;
1386                         }
1387                 p+=i;
1388                 n-=param_len;
1389
1390 #ifndef OPENSSL_NO_RSA
1391                 if (alg_a & SSL_aRSA)
1392                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1393 #else
1394                 if (0)
1395                         ;
1396 #endif
1397 #ifndef OPENSSL_NO_DSA
1398                 else if (alg_a & SSL_aDSS)
1399                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1400 #endif
1401                 /* else anonymous DH, so no certificate or pkey. */
1402
1403                 s->session->sess_cert->peer_dh_tmp=dh;
1404                 dh=NULL;
1405                 }
1406         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1407                 {
1408                 al=SSL_AD_ILLEGAL_PARAMETER;
1409                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1410                 goto f_err;
1411                 }
1412 #endif /* !OPENSSL_NO_DH */
1413
1414 #ifndef OPENSSL_NO_ECDH
1415         else if (alg_k & SSL_kEECDH)
1416                 {
1417                 EC_GROUP *ngroup;
1418                 const EC_GROUP *group;
1419
1420                 if ((ecdh=EC_KEY_new()) == NULL)
1421                         {
1422                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1423                         goto err;
1424                         }
1425
1426                 /* Extract elliptic curve parameters and the
1427                  * server's ephemeral ECDH public key.
1428                  * Keep accumulating lengths of various components in
1429                  * param_len and make sure it never exceeds n.
1430                  */
1431
1432                 /* XXX: For now we only support named (not generic) curves
1433                  * and the ECParameters in this case is just three bytes.
1434                  */
1435                 param_len=3;
1436                 if ((param_len > n) ||
1437                     (*p != NAMED_CURVE_TYPE) || 
1438                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)) 
1439                         {
1440                         al=SSL_AD_INTERNAL_ERROR;
1441                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1442                         goto f_err;
1443                         }
1444
1445                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1446                 if (ngroup == NULL)
1447                         {
1448                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1449                         goto err;
1450                         }
1451                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1452                         {
1453                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1454                         goto err;
1455                         }
1456                 EC_GROUP_free(ngroup);
1457
1458                 group = EC_KEY_get0_group(ecdh);
1459
1460                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1461                     (EC_GROUP_get_degree(group) > 163))
1462                         {
1463                         al=SSL_AD_EXPORT_RESTRICTION;
1464                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1465                         goto f_err;
1466                         }
1467
1468                 p+=3;
1469
1470                 /* Next, get the encoded ECPoint */
1471                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1472                     ((bn_ctx = BN_CTX_new()) == NULL))
1473                         {
1474                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1475                         goto err;
1476                         }
1477
1478                 encoded_pt_len = *p;  /* length of encoded point */
1479                 p+=1;
1480                 param_len += (1 + encoded_pt_len);
1481                 if ((param_len > n) ||
1482                     (EC_POINT_oct2point(group, srvr_ecpoint, 
1483                         p, encoded_pt_len, bn_ctx) == 0))
1484                         {
1485                         al=SSL_AD_DECODE_ERROR;
1486                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1487                         goto f_err;
1488                         }
1489
1490                 n-=param_len;
1491                 p+=encoded_pt_len;
1492
1493                 /* The ECC/TLS specification does not mention
1494                  * the use of DSA to sign ECParameters in the server
1495                  * key exchange message. We do support RSA and ECDSA.
1496                  */
1497                 if (0) ;
1498 #ifndef OPENSSL_NO_RSA
1499                 else if (alg_a & SSL_aRSA)
1500                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1501 #endif
1502 #ifndef OPENSSL_NO_ECDSA
1503                 else if (alg_a & SSL_aECDSA)
1504                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1505 #endif
1506                 /* else anonymous ECDH, so no certificate or pkey. */
1507                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1508                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1509                 ecdh=NULL;
1510                 BN_CTX_free(bn_ctx);
1511                 EC_POINT_free(srvr_ecpoint);
1512                 srvr_ecpoint = NULL;
1513                 }
1514         else if (alg_k)
1515                 {
1516                 al=SSL_AD_UNEXPECTED_MESSAGE;
1517                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1518                 goto f_err;
1519                 }
1520 #endif /* !OPENSSL_NO_ECDH */
1521
1522
1523         /* p points to the next byte, there are 'n' bytes left */
1524
1525         /* if it was signed, check the signature */
1526         if (pkey != NULL)
1527                 {
1528                 n2s(p,i);
1529                 n-=2;
1530                 j=EVP_PKEY_size(pkey);
1531
1532                 if ((i != n) || (n > j) || (n <= 0))
1533                         {
1534                         /* wrong packet length */
1535                         al=SSL_AD_DECODE_ERROR;
1536                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1537                         goto f_err;
1538                         }
1539
1540 #ifndef OPENSSL_NO_RSA
1541                 if (pkey->type == EVP_PKEY_RSA)
1542                         {
1543                         int num;
1544
1545                         j=0;
1546                         q=md_buf;
1547                         for (num=2; num > 0; num--)
1548                                 {
1549                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1550                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1551                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1552                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1553                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1554                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1555                                 q+=i;
1556                                 j+=i;
1557                                 }
1558                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1559                                                                 pkey->pkey.rsa);
1560                         if (i < 0)
1561                                 {
1562                                 al=SSL_AD_DECRYPT_ERROR;
1563                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1564                                 goto f_err;
1565                                 }
1566                         if (i == 0)
1567                                 {
1568                                 /* bad signature */
1569                                 al=SSL_AD_DECRYPT_ERROR;
1570                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1571                                 goto f_err;
1572                                 }
1573                         }
1574                 else
1575 #endif
1576 #ifndef OPENSSL_NO_DSA
1577                         if (pkey->type == EVP_PKEY_DSA)
1578                         {
1579                         /* lets do DSS */
1580                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1581                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1582                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1583                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1584                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1585                                 {
1586                                 /* bad signature */
1587                                 al=SSL_AD_DECRYPT_ERROR;
1588                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1589                                 goto f_err;
1590                                 }
1591                         }
1592                 else
1593 #endif
1594 #ifndef OPENSSL_NO_ECDSA
1595                         if (pkey->type == EVP_PKEY_EC)
1596                         {
1597                         /* let's do ECDSA */
1598                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1599                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1600                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1601                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1602                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1603                                 {
1604                                 /* bad signature */
1605                                 al=SSL_AD_DECRYPT_ERROR;
1606                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1607                                 goto f_err;
1608                                 }
1609                         }
1610                 else
1611 #endif
1612                         {
1613                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1614                         goto err;
1615                         }
1616                 }
1617         else
1618                 {
1619                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1620                         /* aNULL or kPSK do not need public keys */
1621                         {
1622                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1623                         goto err;
1624                         }
1625                 /* still data left over */
1626                 if (n != 0)
1627                         {
1628                         al=SSL_AD_DECODE_ERROR;
1629                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1630                         goto f_err;
1631                         }
1632                 }
1633         EVP_PKEY_free(pkey);
1634         EVP_MD_CTX_cleanup(&md_ctx);
1635         return(1);
1636 f_err:
1637         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1638 err:
1639         EVP_PKEY_free(pkey);
1640 #ifndef OPENSSL_NO_RSA
1641         if (rsa != NULL)
1642                 RSA_free(rsa);
1643 #endif
1644 #ifndef OPENSSL_NO_DH
1645         if (dh != NULL)
1646                 DH_free(dh);
1647 #endif
1648 #ifndef OPENSSL_NO_ECDH
1649         BN_CTX_free(bn_ctx);
1650         EC_POINT_free(srvr_ecpoint);
1651         if (ecdh != NULL)
1652                 EC_KEY_free(ecdh);
1653 #endif
1654         EVP_MD_CTX_cleanup(&md_ctx);
1655         return(-1);
1656         }
1657
1658 int ssl3_get_certificate_request(SSL *s)
1659         {
1660         int ok,ret=0;
1661         unsigned long n,nc,l;
1662         unsigned int llen,ctype_num,i;
1663         X509_NAME *xn=NULL;
1664         const unsigned char *p,*q;
1665         unsigned char *d;
1666         STACK_OF(X509_NAME) *ca_sk=NULL;
1667
1668         n=s->method->ssl_get_message(s,
1669                 SSL3_ST_CR_CERT_REQ_A,
1670                 SSL3_ST_CR_CERT_REQ_B,
1671                 -1,
1672                 s->max_cert_list,
1673                 &ok);
1674
1675         if (!ok) return((int)n);
1676
1677         s->s3->tmp.cert_req=0;
1678
1679         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1680                 {
1681                 s->s3->tmp.reuse_message=1;
1682                 return(1);
1683                 }
1684
1685         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1686                 {
1687                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1688                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1689                 goto err;
1690                 }
1691
1692         /* TLS does not like anon-DH with client cert */
1693         if (s->version > SSL3_VERSION)
1694                 {
1695                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1696                         {
1697                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1698                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1699                         goto err;
1700                         }
1701                 }
1702
1703         p=d=(unsigned char *)s->init_msg;
1704
1705         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1706                 {
1707                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1708                 goto err;
1709                 }
1710
1711         /* get the certificate types */
1712         ctype_num= *(p++);
1713         if (ctype_num > SSL3_CT_NUMBER)
1714                 ctype_num=SSL3_CT_NUMBER;
1715         for (i=0; i<ctype_num; i++)
1716                 s->s3->tmp.ctype[i]= p[i];
1717         p+=ctype_num;
1718
1719         /* get the CA RDNs */
1720         n2s(p,llen);
1721 #if 0
1722 {
1723 FILE *out;
1724 out=fopen("/tmp/vsign.der","w");
1725 fwrite(p,1,llen,out);
1726 fclose(out);
1727 }
1728 #endif
1729
1730         if ((llen+ctype_num+2+1) != n)
1731                 {
1732                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1733                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1734                 goto err;
1735                 }
1736
1737         for (nc=0; nc<llen; )
1738                 {
1739                 n2s(p,l);
1740                 if ((l+nc+2) > llen)
1741                         {
1742                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1743                                 goto cont; /* netscape bugs */
1744                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1745                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1746                         goto err;
1747                         }
1748
1749                 q=p;
1750
1751                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1752                         {
1753                         /* If netscape tolerance is on, ignore errors */
1754                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1755                                 goto cont;
1756                         else
1757                                 {
1758                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1759                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1760                                 goto err;
1761                                 }
1762                         }
1763
1764                 if (q != (p+l))
1765                         {
1766                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1767                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1768                         goto err;
1769                         }
1770                 if (!sk_X509_NAME_push(ca_sk,xn))
1771                         {
1772                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1773                         goto err;
1774                         }
1775
1776                 p+=l;
1777                 nc+=l+2;
1778                 }
1779
1780         if (0)
1781                 {
1782 cont:
1783                 ERR_clear_error();
1784                 }
1785
1786         /* we should setup a certificate to return.... */
1787         s->s3->tmp.cert_req=1;
1788         s->s3->tmp.ctype_num=ctype_num;
1789         if (s->s3->tmp.ca_names != NULL)
1790                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1791         s->s3->tmp.ca_names=ca_sk;
1792         ca_sk=NULL;
1793
1794         ret=1;
1795 err:
1796         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1797         return(ret);
1798         }
1799
1800 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1801         {
1802         return(X509_NAME_cmp(*a,*b));
1803         }
1804 #ifndef OPENSSL_NO_TLSEXT
1805 int ssl3_get_new_session_ticket(SSL *s)
1806         {
1807         int ok,al,ret=0, ticklen;
1808         long n;
1809         const unsigned char *p;
1810         unsigned char *d;
1811
1812         n=s->method->ssl_get_message(s,
1813                 SSL3_ST_CR_SESSION_TICKET_A,
1814                 SSL3_ST_CR_SESSION_TICKET_B,
1815                 -1,
1816                 16384,
1817                 &ok);
1818
1819         if (!ok)
1820                 return((int)n);
1821
1822         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1823                 {
1824                 s->s3->tmp.reuse_message=1;
1825                 return(1);
1826                 }
1827         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1828                 {
1829                 al=SSL_AD_UNEXPECTED_MESSAGE;
1830                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1831                 goto f_err;
1832                 }
1833         if (n < 6)
1834                 {
1835                 /* need at least ticket_lifetime_hint + ticket length */
1836                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1837                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1838                 goto f_err;
1839                 }
1840
1841         p=d=(unsigned char *)s->init_msg;
1842         n2l(p, s->session->tlsext_tick_lifetime_hint);
1843         n2s(p, ticklen);
1844         /* ticket_lifetime_hint + ticket_length + ticket */
1845         if (ticklen + 6 != n)
1846                 {
1847                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1848                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1849                 goto f_err;
1850                 }
1851         if (s->session->tlsext_tick)
1852                 {
1853                 OPENSSL_free(s->session->tlsext_tick);
1854                 s->session->tlsext_ticklen = 0;
1855                 }
1856         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1857         if (!s->session->tlsext_tick)
1858                 {
1859                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1860                 goto err;
1861                 }
1862         memcpy(s->session->tlsext_tick, p, ticklen);
1863         s->session->tlsext_ticklen = ticklen;
1864         /* There are two ways to detect a resumed ticket sesion.
1865          * One is to set an appropriate session ID and then the server
1866          * must return a match in ServerHello. This allows the normal
1867          * client session ID matching to work and we know much 
1868          * earlier that the ticket has been accepted.
1869          * 
1870          * The other way is to set zero length session ID when the
1871          * ticket is presented and rely on the handshake to determine
1872          * session resumption.
1873          *
1874          * We choose the former approach because this fits in with
1875          * assumptions elsewhere in OpenSSL. The session ID is set
1876          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1877          * ticket.
1878          */ 
1879         EVP_Digest(p, ticklen,
1880                         s->session->session_id, &s->session->session_id_length,
1881 #ifndef OPENSSL_NO_SHA256
1882                                                         EVP_sha256(), NULL);
1883 #else
1884                                                         EVP_sha1(), NULL);
1885 #endif
1886         ret=1;
1887         return(ret);
1888 f_err:
1889         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1890 err:
1891         return(-1);
1892         }
1893
1894 int ssl3_get_cert_status(SSL *s)
1895         {
1896         int ok, al;
1897         unsigned long resplen,n;
1898         const unsigned char *p;
1899
1900         n=s->method->ssl_get_message(s,
1901                 SSL3_ST_CR_CERT_STATUS_A,
1902                 SSL3_ST_CR_CERT_STATUS_B,
1903                 SSL3_MT_CERTIFICATE_STATUS,
1904                 16384,
1905                 &ok);
1906
1907         if (!ok) return((int)n);
1908         if (n < 4)
1909                 {
1910                 /* need at least status type + length */
1911                 al = SSL_AD_DECODE_ERROR;
1912                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1913                 goto f_err;
1914                 }
1915         p = (unsigned char *)s->init_msg;
1916         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1917                 {
1918                 al = SSL_AD_DECODE_ERROR;
1919                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1920                 goto f_err;
1921                 }
1922         n2l3(p, resplen);
1923         if (resplen + 4 != n)
1924                 {
1925                 al = SSL_AD_DECODE_ERROR;
1926                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1927                 goto f_err;
1928                 }
1929         if (s->tlsext_ocsp_resp)
1930                 OPENSSL_free(s->tlsext_ocsp_resp);
1931         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1932         if (!s->tlsext_ocsp_resp)
1933                 {
1934                 al = SSL_AD_INTERNAL_ERROR;
1935                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1936                 goto f_err;
1937                 }
1938         s->tlsext_ocsp_resplen = resplen;
1939         if (s->ctx->tlsext_status_cb)
1940                 {
1941                 int ret;
1942                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1943                 if (ret == 0)
1944                         {
1945                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1946                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1947                         goto f_err;
1948                         }
1949                 if (ret < 0)
1950                         {
1951                         al = SSL_AD_INTERNAL_ERROR;
1952                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1953                         goto f_err;
1954                         }
1955                 }
1956         return 1;
1957 f_err:
1958         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1959         return(-1);
1960         }
1961 #endif
1962
1963 int ssl3_get_server_done(SSL *s)
1964         {
1965         int ok,ret=0;
1966         long n;
1967
1968         n=s->method->ssl_get_message(s,
1969                 SSL3_ST_CR_SRVR_DONE_A,
1970                 SSL3_ST_CR_SRVR_DONE_B,
1971                 SSL3_MT_SERVER_DONE,
1972                 30, /* should be very small, like 0 :-) */
1973                 &ok);
1974
1975         if (!ok) return((int)n);
1976         if (n > 0)
1977                 {
1978                 /* should contain no data */
1979                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1980                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1981                 return -1;
1982                 }
1983         ret=1;
1984         return(ret);
1985         }
1986
1987
1988 int ssl3_send_client_key_exchange(SSL *s)
1989         {
1990         unsigned char *p,*d;
1991         int n;
1992         unsigned long alg_k;
1993 #ifndef OPENSSL_NO_RSA
1994         unsigned char *q;
1995         EVP_PKEY *pkey=NULL;
1996 #endif
1997 #ifndef OPENSSL_NO_KRB5
1998         KSSL_ERR kssl_err;
1999 #endif /* OPENSSL_NO_KRB5 */
2000 #ifndef OPENSSL_NO_ECDH
2001         EC_KEY *clnt_ecdh = NULL;
2002         const EC_POINT *srvr_ecpoint = NULL;
2003         EVP_PKEY *srvr_pub_pkey = NULL;
2004         unsigned char *encodedPoint = NULL;
2005         int encoded_pt_len = 0;
2006         BN_CTX * bn_ctx = NULL;
2007 #endif
2008
2009         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2010                 {
2011                 d=(unsigned char *)s->init_buf->data;
2012                 p= &(d[4]);
2013
2014                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2015
2016                 /* Fool emacs indentation */
2017                 if (0) {}
2018 #ifndef OPENSSL_NO_RSA
2019                 else if (alg_k & SSL_kRSA)
2020                         {
2021                         RSA *rsa;
2022                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2023
2024                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2025                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2026                         else
2027                                 {
2028                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2029                                 if ((pkey == NULL) ||
2030                                         (pkey->type != EVP_PKEY_RSA) ||
2031                                         (pkey->pkey.rsa == NULL))
2032                                         {
2033                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2034                                         goto err;
2035                                         }
2036                                 rsa=pkey->pkey.rsa;
2037                                 EVP_PKEY_free(pkey);
2038                                 }
2039                                 
2040                         tmp_buf[0]=s->client_version>>8;
2041                         tmp_buf[1]=s->client_version&0xff;
2042                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2043                                         goto err;
2044
2045                         s->session->master_key_length=sizeof tmp_buf;
2046
2047                         q=p;
2048                         /* Fix buf for TLS and beyond */
2049                         if (s->version > SSL3_VERSION)
2050                                 p+=2;
2051                         n=RSA_public_encrypt(sizeof tmp_buf,
2052                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2053 #ifdef PKCS1_CHECK
2054                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2055                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2056 #endif
2057                         if (n <= 0)
2058                                 {
2059                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2060                                 goto err;
2061                                 }
2062
2063                         /* Fix buf for TLS and beyond */
2064                         if (s->version > SSL3_VERSION)
2065                                 {
2066                                 s2n(n,q);
2067                                 n+=2;
2068                                 }
2069
2070                         s->session->master_key_length=
2071                                 s->method->ssl3_enc->generate_master_secret(s,
2072                                         s->session->master_key,
2073                                         tmp_buf,sizeof tmp_buf);
2074                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2075                         }
2076 #endif
2077 #ifndef OPENSSL_NO_KRB5
2078                 else if (alg_k & SSL_kKRB5)
2079                         {
2080                         krb5_error_code krb5rc;
2081                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2082                         /*  krb5_data   krb5_ap_req;  */
2083                         krb5_data       *enc_ticket;
2084                         krb5_data       authenticator, *authp = NULL;
2085                         EVP_CIPHER_CTX  ciph_ctx;
2086                         const EVP_CIPHER *enc = NULL;
2087                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2088                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2089                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
2090                                                 + EVP_MAX_IV_LENGTH];
2091                         int             padl, outl = sizeof(epms);
2092
2093                         EVP_CIPHER_CTX_init(&ciph_ctx);
2094
2095 #ifdef KSSL_DEBUG
2096                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2097                                 alg_k, SSL_kKRB5);
2098 #endif  /* KSSL_DEBUG */
2099
2100                         authp = NULL;
2101 #ifdef KRB5SENDAUTH
2102                         if (KRB5SENDAUTH)  authp = &authenticator;
2103 #endif  /* KRB5SENDAUTH */
2104
2105                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2106                                 &kssl_err);
2107                         enc = kssl_map_enc(kssl_ctx->enctype);
2108                         if (enc == NULL)
2109                             goto err;
2110 #ifdef KSSL_DEBUG
2111                         {
2112                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2113                         if (krb5rc && kssl_err.text)
2114                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2115                         }
2116 #endif  /* KSSL_DEBUG */
2117
2118                         if (krb5rc)
2119                                 {
2120                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2121                                                 SSL_AD_HANDSHAKE_FAILURE);
2122                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2123                                                 kssl_err.reason);
2124                                 goto err;
2125                                 }
2126
2127                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2128                         **  in place of RFC 2712 KerberosWrapper, as in:
2129                         **
2130                         **  Send ticket (copy to *p, set n = length)
2131                         **  n = krb5_ap_req.length;
2132                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2133                         **  if (krb5_ap_req.data)  
2134                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2135                         **
2136                         **  Now using real RFC 2712 KerberosWrapper
2137                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2138                         **  Note: 2712 "opaque" types are here replaced
2139                         **  with a 2-byte length followed by the value.
2140                         **  Example:
2141                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2142                         **  Where "xx xx" = length bytes.  Shown here with
2143                         **  optional authenticator omitted.
2144                         */
2145
2146                         /*  KerberosWrapper.Ticket              */
2147                         s2n(enc_ticket->length,p);
2148                         memcpy(p, enc_ticket->data, enc_ticket->length);
2149                         p+= enc_ticket->length;
2150                         n = enc_ticket->length + 2;
2151
2152                         /*  KerberosWrapper.Authenticator       */
2153                         if (authp  &&  authp->length)  
2154                                 {
2155                                 s2n(authp->length,p);
2156                                 memcpy(p, authp->data, authp->length);
2157                                 p+= authp->length;
2158                                 n+= authp->length + 2;
2159                                 
2160                                 free(authp->data);
2161                                 authp->data = NULL;
2162                                 authp->length = 0;
2163                                 }
2164                         else
2165                                 {
2166                                 s2n(0,p);/*  null authenticator length  */
2167                                 n+=2;
2168                                 }
2169  
2170                             tmp_buf[0]=s->client_version>>8;
2171                             tmp_buf[1]=s->client_version&0xff;
2172                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2173                                 goto err;
2174
2175                         /*  20010420 VRS.  Tried it this way; failed.
2176                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2177                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2178                         **                              kssl_ctx->length);
2179                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2180                         */
2181
2182                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2183                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2184                                 kssl_ctx->key,iv);
2185                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2186                                 sizeof tmp_buf);
2187                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2188                         outl += padl;
2189                         if (outl > (int)sizeof epms)
2190                                 {
2191                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2192                                 goto err;
2193                                 }
2194                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2195
2196                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2197                         s2n(outl,p);
2198                         memcpy(p, epms, outl);
2199                         p+=outl;
2200                         n+=outl + 2;
2201
2202                         s->session->master_key_length=
2203                                 s->method->ssl3_enc->generate_master_secret(s,
2204                                         s->session->master_key,
2205                                         tmp_buf, sizeof tmp_buf);
2206
2207                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2208                         OPENSSL_cleanse(epms, outl);
2209                         }
2210 #endif
2211 #ifndef OPENSSL_NO_DH
2212                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2213                         {
2214                         DH *dh_srvr,*dh_clnt;
2215
2216                         if (s->session->sess_cert == NULL) 
2217                                 {
2218                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2219                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2220                                 goto err;
2221                                 }
2222
2223                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2224                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2225                         else
2226                                 {
2227                                 /* we get them from the cert */
2228                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2229                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2230                                 goto err;
2231                                 }
2232                         
2233                         /* generate a new random key */
2234                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2235                                 {
2236                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2237                                 goto err;
2238                                 }
2239                         if (!DH_generate_key(dh_clnt))
2240                                 {
2241                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2242                                 goto err;
2243                                 }
2244
2245                         /* use the 'p' output buffer for the DH key, but
2246                          * make sure to clear it out afterwards */
2247
2248                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2249
2250                         if (n <= 0)
2251                                 {
2252                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2253                                 goto err;
2254                                 }
2255
2256                         /* generate master key from the result */
2257                         s->session->master_key_length=
2258                                 s->method->ssl3_enc->generate_master_secret(s,
2259                                         s->session->master_key,p,n);
2260                         /* clean up */
2261                         memset(p,0,n);
2262
2263                         /* send off the data */
2264                         n=BN_num_bytes(dh_clnt->pub_key);
2265                         s2n(n,p);
2266                         BN_bn2bin(dh_clnt->pub_key,p);
2267                         n+=2;
2268
2269                         DH_free(dh_clnt);
2270
2271                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2272                         }
2273 #endif
2274
2275 #ifndef OPENSSL_NO_ECDH 
2276                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2277                         {
2278                         const EC_GROUP *srvr_group = NULL;
2279                         EC_KEY *tkey;
2280                         int ecdh_clnt_cert = 0;
2281                         int field_size = 0;
2282
2283                         /* Did we send out the client's
2284                          * ECDH share for use in premaster
2285                          * computation as part of client certificate?
2286                          * If so, set ecdh_clnt_cert to 1.
2287                          */
2288                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
2289                                 {
2290                                 /* XXX: For now, we do not support client
2291                                  * authentication using ECDH certificates.
2292                                  * To add such support, one needs to add
2293                                  * code that checks for appropriate 
2294                                  * conditions and sets ecdh_clnt_cert to 1.
2295                                  * For example, the cert have an ECC
2296                                  * key on the same curve as the server's
2297                                  * and the key should be authorized for
2298                                  * key agreement.
2299                                  *
2300                                  * One also needs to add code in ssl3_connect
2301                                  * to skip sending the certificate verify
2302                                  * message.
2303                                  *
2304                                  * if ((s->cert->key->privatekey != NULL) &&
2305                                  *     (s->cert->key->privatekey->type ==
2306                                  *      EVP_PKEY_EC) && ...)
2307                                  * ecdh_clnt_cert = 1;
2308                                  */
2309                                 }
2310
2311                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2312                                 {
2313                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2314                                 }
2315                         else
2316                                 {
2317                                 /* Get the Server Public Key from Cert */
2318                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2319                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2320                                 if ((srvr_pub_pkey == NULL) ||
2321                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2322                                     (srvr_pub_pkey->pkey.ec == NULL))
2323                                         {
2324                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2325                                             ERR_R_INTERNAL_ERROR);
2326                                         goto err;
2327                                         }
2328
2329                                 tkey = srvr_pub_pkey->pkey.ec;
2330                                 }
2331
2332                         srvr_group   = EC_KEY_get0_group(tkey);
2333                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2334
2335                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2336                                 {
2337                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2338                                     ERR_R_INTERNAL_ERROR);
2339                                 goto err;
2340                                 }
2341
2342                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
2343                                 {
2344                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2345                                 goto err;
2346                                 }
2347
2348                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2349                                 {
2350                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2351                                 goto err;
2352                                 }
2353                         if (ecdh_clnt_cert) 
2354                                 { 
2355                                 /* Reuse key info from our certificate
2356                                  * We only need our private key to perform
2357                                  * the ECDH computation.
2358                                  */
2359                                 const BIGNUM *priv_key;
2360                                 tkey = s->cert->key->privatekey->pkey.ec;
2361                                 priv_key = EC_KEY_get0_private_key(tkey);
2362                                 if (priv_key == NULL)
2363                                         {
2364                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2365                                         goto err;
2366                                         }
2367                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2368                                         {
2369                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2370                                         goto err;
2371                                         }
2372                                 }
2373                         else 
2374                                 {
2375                                 /* Generate a new ECDH key pair */
2376                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2377                                         {
2378                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2379                                         goto err;
2380                                         }
2381                                 }
2382
2383                         /* use the 'p' output buffer for the ECDH key, but
2384                          * make sure to clear it out afterwards
2385                          */
2386
2387                         field_size = EC_GROUP_get_degree(srvr_group);
2388                         if (field_size <= 0)
2389                                 {
2390                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2391                                        ERR_R_ECDH_LIB);
2392                                 goto err;
2393                                 }
2394                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2395                         if (n <= 0)
2396                                 {
2397                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2398                                        ERR_R_ECDH_LIB);
2399                                 goto err;
2400                                 }
2401
2402                         /* generate master key from the result */
2403                         s->session->master_key_length = s->method->ssl3_enc \
2404                             -> generate_master_secret(s, 
2405                                 s->session->master_key,
2406                                 p, n);
2407
2408                         memset(p, 0, n); /* clean up */
2409
2410                         if (ecdh_clnt_cert) 
2411                                 {
2412                                 /* Send empty client key exch message */
2413                                 n = 0;
2414                                 }
2415                         else 
2416                                 {
2417                                 /* First check the size of encoding and
2418                                  * allocate memory accordingly.
2419                                  */
2420                                 encoded_pt_len = 
2421                                     EC_POINT_point2oct(srvr_group, 
2422                                         EC_KEY_get0_public_key(clnt_ecdh), 
2423                                         POINT_CONVERSION_UNCOMPRESSED, 
2424                                         NULL, 0, NULL);
2425
2426                                 encodedPoint = (unsigned char *) 
2427                                     OPENSSL_malloc(encoded_pt_len * 
2428                                         sizeof(unsigned char)); 
2429                                 bn_ctx = BN_CTX_new();
2430                                 if ((encodedPoint == NULL) || 
2431                                     (bn_ctx == NULL)) 
2432                                         {
2433                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2434                                         goto err;
2435                                         }
2436
2437                                 /* Encode the public key */
2438                                 n = EC_POINT_point2oct(srvr_group, 
2439                                     EC_KEY_get0_public_key(clnt_ecdh), 
2440                                     POINT_CONVERSION_UNCOMPRESSED, 
2441                                     encodedPoint, encoded_pt_len, bn_ctx);
2442
2443                                 *p = n; /* length of encoded point */
2444                                 /* Encoded point will be copied here */
2445                                 p += 1; 
2446                                 /* copy the point */
2447                                 memcpy((unsigned char *)p, encodedPoint, n);
2448                                 /* increment n to account for length field */
2449                                 n += 1; 
2450                                 }
2451
2452                         /* Free allocated memory */
2453                         BN_CTX_free(bn_ctx);
2454                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2455                         if (clnt_ecdh != NULL) 
2456                                  EC_KEY_free(clnt_ecdh);
2457                         EVP_PKEY_free(srvr_pub_pkey);
2458                         }
2459 #endif /* !OPENSSL_NO_ECDH */
2460                 else if (alg_k & SSL_kGOST) 
2461                         {
2462                         /* GOST key exchange message creation */
2463                         EVP_PKEY_CTX *pkey_ctx;
2464                         X509 *peer_cert; 
2465                         size_t msglen;
2466                         unsigned int md_len;
2467                         int keytype;
2468                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2469                         EVP_MD_CTX *ukm_hash;
2470                         EVP_PKEY *pub_key;
2471
2472                         /* Get server sertificate PKEY and create ctx from it */
2473                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2474                         if (!peer_cert) 
2475                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2476                         if (!peer_cert)         {
2477                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2478                                         goto err;
2479                                 }       
2480                                 
2481                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2482                         /* If we have send a certificate, and certificate key
2483
2484                          * parameters match those of server certificate, use
2485                          * certificate key for key exchange
2486                          */
2487
2488                          /* Otherwise, generate ephemeral key pair */
2489                                         
2490                         EVP_PKEY_encrypt_init(pkey_ctx);
2491                           /* Generate session key */    
2492                     RAND_bytes(premaster_secret,32);
2493                         /* If we have client certificate, use its secret as peer key */
2494                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2495                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2496                                         /* If there was an error - just ignore it. Ephemeral key
2497                                         * would be used
2498                                         */
2499                                         ERR_clear_error();
2500                                 }
2501                         }                       
2502                         /* Compute shared IV and store it in algorithm-specific
2503                          * context data */
2504                         ukm_hash = EVP_MD_CTX_create();
2505                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2506                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2507                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2508                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2509                         EVP_MD_CTX_destroy(ukm_hash);
2510                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2511                                 8,shared_ukm)<0) {
2512                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2513                                                 SSL_R_LIBRARY_BUG);
2514                                         goto err;
2515                                 }       
2516                         /* Make GOST keytransport blob message */
2517                         /*Encapsulate it into sequence */
2518                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2519                         msglen=255;
2520                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2521                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2522                                         SSL_R_LIBRARY_BUG);
2523                                 goto err;
2524                         }
2525                         if (msglen >= 0x80)
2526                                 {
2527                                 *(p++)=0x81;
2528                                 *(p++)= msglen & 0xff;
2529                                 n=msglen+3;
2530                                 }
2531                         else
2532                                 {
2533                                 *(p++)= msglen & 0xff;
2534                                 n=msglen+2;
2535                                 }
2536                         memcpy(p, tmp, msglen);
2537                         /* Check if pubkey from client certificate was used */
2538                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2539                                 {
2540                                 /* Set flag "skip certificate verify" */
2541                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2542                                 }
2543                         EVP_PKEY_CTX_free(pkey_ctx);
2544                         s->session->master_key_length=
2545                                 s->method->ssl3_enc->generate_master_secret(s,
2546                                         s->session->master_key,premaster_secret,32);
2547                         EVP_PKEY_free(pub_key);
2548
2549                         }
2550 #ifndef OPENSSL_NO_PSK
2551                 else if (alg_k & SSL_kPSK)
2552                         {
2553                         char identity[PSK_MAX_IDENTITY_LEN];
2554                         unsigned char *t = NULL;
2555                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2556                         unsigned int pre_ms_len = 0, psk_len = 0;
2557                         int psk_err = 1;
2558
2559                         n = 0;
2560                         if (s->psk_client_callback == NULL)
2561                                 {
2562                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2563                                         SSL_R_PSK_NO_CLIENT_CB);
2564                                 goto err;
2565                                 }
2566
2567                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2568                                 identity, PSK_MAX_IDENTITY_LEN,
2569                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2570                         if (psk_len > PSK_MAX_PSK_LEN)
2571                                 {
2572                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2573                                         ERR_R_INTERNAL_ERROR);
2574                                 goto psk_err;
2575                                 }
2576                         else if (psk_len == 0)
2577                                 {
2578                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2579                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2580                                 goto psk_err;
2581                                 }
2582
2583                         /* create PSK pre_master_secret */
2584                         pre_ms_len = 2+psk_len+2+psk_len;
2585                         t = psk_or_pre_ms;
2586                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2587                         s2n(psk_len, t);
2588                         memset(t, 0, psk_len);
2589                         t+=psk_len;
2590                         s2n(psk_len, t);
2591
2592                         if (s->session->psk_identity_hint != NULL)
2593                                 OPENSSL_free(s->session->psk_identity_hint);
2594                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2595                         if (s->ctx->psk_identity_hint != NULL &&
2596                                 s->session->psk_identity_hint == NULL)
2597                                 {
2598                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2599                                         ERR_R_MALLOC_FAILURE);
2600                                 goto psk_err;
2601                                 }
2602
2603                         if (s->session->psk_identity != NULL)
2604                                 OPENSSL_free(s->session->psk_identity);
2605                         s->session->psk_identity = BUF_strdup(identity);
2606                         if (s->session->psk_identity == NULL)
2607                                 {
2608                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2609                                         ERR_R_MALLOC_FAILURE);
2610                                 goto psk_err;
2611                                 }
2612
2613                         s->session->master_key_length =
2614                                 s->method->ssl3_enc->generate_master_secret(s,
2615                                         s->session->master_key,
2616                                         psk_or_pre_ms, pre_ms_len); 
2617                         n = strlen(identity);
2618                         s2n(n, p);
2619                         memcpy(p, identity, n);
2620                         n+=2;
2621                         psk_err = 0;
2622                 psk_err:
2623                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2624                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2625                         if (psk_err != 0)
2626                                 {
2627                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2628                                 goto err;
2629                                 }
2630                         }
2631 #endif
2632                 else
2633                         {
2634                         ssl3_send_alert(s, SSL3_AL_FATAL,
2635                             SSL_AD_HANDSHAKE_FAILURE);
2636                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2637                             ERR_R_INTERNAL_ERROR);
2638                         goto err;
2639                         }
2640                 
2641                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2642                 l2n3(n,d);
2643
2644                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2645                 /* number of bytes to write */
2646                 s->init_num=n+4;
2647                 s->init_off=0;
2648                 }
2649
2650         /* SSL3_ST_CW_KEY_EXCH_B */
2651         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2652 err:
2653 #ifndef OPENSSL_NO_ECDH
2654         BN_CTX_free(bn_ctx);
2655         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2656         if (clnt_ecdh != NULL) 
2657                 EC_KEY_free(clnt_ecdh);
2658         EVP_PKEY_free(srvr_pub_pkey);
2659 #endif
2660         return(-1);
2661         }
2662
2663 int ssl3_send_client_verify(SSL *s)
2664         {
2665         unsigned char *p,*d;
2666         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2667         EVP_PKEY *pkey;
2668         EVP_PKEY_CTX *pctx=NULL;
2669 #ifndef OPENSSL_NO_RSA
2670         unsigned u=0;
2671 #endif
2672         unsigned long n;
2673         int j;
2674
2675         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2676                 {
2677                 d=(unsigned char *)s->init_buf->data;
2678                 p= &(d[4]);
2679                 pkey=s->cert->key->privatekey;
2680 /* Create context from key and test if sha1 is allowed as digest */
2681                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2682                 EVP_PKEY_sign_init(pctx);
2683                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2684                         {
2685                         s->method->ssl3_enc->cert_verify_mac(s,
2686                                                 NID_sha1,
2687                                                 &(data[MD5_DIGEST_LENGTH]));
2688                         }
2689                 else
2690                         {
2691                         ERR_clear_error();
2692                         }
2693 #ifndef OPENSSL_NO_RSA
2694                 if (pkey->type == EVP_PKEY_RSA)
2695                         {
2696                         s->method->ssl3_enc->cert_verify_mac(s,
2697                                 NID_md5,
2698                                 &(data[0]));
2699                         if (RSA_sign(NID_md5_sha1, data,
2700                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2701                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2702                                 {
2703                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2704                                 goto err;
2705                                 }
2706                         s2n(u,p);
2707                         n=u+2;
2708                         }
2709                 else
2710 #endif
2711 #ifndef OPENSSL_NO_DSA
2712                         if (pkey->type == EVP_PKEY_DSA)
2713                         {
2714                         if (!DSA_sign(pkey->save_type,
2715                                 &(data[MD5_DIGEST_LENGTH]),
2716                                 SHA_DIGEST_LENGTH,&(p[2]),
2717                                 (unsigned int *)&j,pkey->pkey.dsa))
2718                                 {
2719                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2720                                 goto err;
2721                                 }
2722                         s2n(j,p);
2723                         n=j+2;
2724                         }
2725                 else
2726 #endif
2727 #ifndef OPENSSL_NO_ECDSA
2728                         if (pkey->type == EVP_PKEY_EC)
2729                         {
2730                         if (!ECDSA_sign(pkey->save_type,
2731                                 &(data[MD5_DIGEST_LENGTH]),
2732                                 SHA_DIGEST_LENGTH,&(p[2]),
2733                                 (unsigned int *)&j,pkey->pkey.ec))
2734                                 {
2735                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2736                                     ERR_R_ECDSA_LIB);
2737                                 goto err;
2738                                 }
2739                         s2n(j,p);
2740                         n=j+2;
2741                         }
2742                 else
2743 #endif
2744                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) 
2745                 {
2746                 unsigned char signbuf[64];
2747                 int i;
2748                 size_t sigsize=64;
2749                 s->method->ssl3_enc->cert_verify_mac(s,
2750                         NID_id_GostR3411_94,
2751                         data);
2752                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2753                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2754                         ERR_R_INTERNAL_ERROR);
2755                         goto err;
2756                 }
2757                 for (i=63,j=0; i>=0; j++, i--) {
2758                         p[2+j]=signbuf[i];
2759                 }       
2760                 s2n(j,p);
2761                 n=j+2;
2762                 }
2763                 else
2764                 {
2765                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2766                         goto err;
2767                 }
2768                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2769                 l2n3(n,d);
2770
2771                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2772                 s->init_num=(int)n+4;
2773                 s->init_off=0;
2774                 }
2775         EVP_PKEY_CTX_free(pctx);
2776         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2777 err:
2778         EVP_PKEY_CTX_free(pctx);
2779         return(-1);
2780         }
2781
2782 int ssl3_send_client_certificate(SSL *s)
2783         {
2784         X509 *x509=NULL;
2785         EVP_PKEY *pkey=NULL;
2786         int i;
2787         unsigned long l;
2788
2789         if (s->state == SSL3_ST_CW_CERT_A)
2790                 {
2791                 if ((s->cert == NULL) ||
2792                         (s->cert->key->x509 == NULL) ||
2793                         (s->cert->key->privatekey == NULL))
2794                         s->state=SSL3_ST_CW_CERT_B;
2795                 else
2796                         s->state=SSL3_ST_CW_CERT_C;
2797                 }
2798
2799         /* We need to get a client cert */
2800         if (s->state == SSL3_ST_CW_CERT_B)
2801                 {
2802                 /* If we get an error, we need to
2803                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2804                  * We then get retied later */
2805                 i=0;
2806                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2807                 if (i < 0)
2808                         {
2809                         s->rwstate=SSL_X509_LOOKUP;
2810                         return(-1);
2811                         }
2812                 s->rwstate=SSL_NOTHING;
2813                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2814                         {
2815                         s->state=SSL3_ST_CW_CERT_B;
2816                         if (    !SSL_use_certificate(s,x509) ||
2817                                 !SSL_use_PrivateKey(s,pkey))
2818                                 i=0;
2819                         }
2820                 else if (i == 1)
2821                         {
2822                         i=0;
2823                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2824                         }
2825
2826                 if (x509 != NULL) X509_free(x509);
2827                 if (pkey != NULL) EVP_PKEY_free(pkey);
2828                 if (i == 0)
2829                         {
2830                         if (s->version == SSL3_VERSION)
2831                                 {
2832                                 s->s3->tmp.cert_req=0;
2833                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2834                                 return(1);
2835                                 }
2836                         else
2837                                 {
2838                                 s->s3->tmp.cert_req=2;
2839                                 }
2840                         }
2841
2842                 /* Ok, we have a cert */
2843                 s->state=SSL3_ST_CW_CERT_C;
2844                 }
2845
2846         if (s->state == SSL3_ST_CW_CERT_C)
2847                 {
2848                 s->state=SSL3_ST_CW_CERT_D;
2849                 l=ssl3_output_cert_chain(s,
2850                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2851                 s->init_num=(int)l;
2852                 s->init_off=0;
2853                 }
2854         /* SSL3_ST_CW_CERT_D */
2855         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2856         }
2857
2858 #define has_bits(i,m)   (((i)&(m)) == (m))
2859
2860 int ssl3_check_cert_and_algorithm(SSL *s)
2861         {
2862         int i,idx;
2863         long alg_k,alg_a;
2864         EVP_PKEY *pkey=NULL;
2865         SESS_CERT *sc;
2866 #ifndef OPENSSL_NO_RSA
2867         RSA *rsa;
2868 #endif
2869 #ifndef OPENSSL_NO_DH
2870         DH *dh;
2871 #endif
2872
2873         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2874         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2875
2876         /* we don't have a certificate */
2877         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2878                 return(1);
2879
2880         sc=s->session->sess_cert;
2881         if (sc == NULL)
2882                 {
2883                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2884                 goto err;
2885                 }
2886
2887 #ifndef OPENSSL_NO_RSA
2888         rsa=s->session->sess_cert->peer_rsa_tmp;
2889 #endif
2890 #ifndef OPENSSL_NO_DH
2891         dh=s->session->sess_cert->peer_dh_tmp;
2892 #endif
2893
2894         /* This is the passed certificate */
2895
2896         idx=sc->peer_cert_type;
2897 #ifndef OPENSSL_NO_ECDH
2898         if (idx == SSL_PKEY_ECC)
2899                 {
2900                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2901                     s->s3->tmp.new_cipher) == 0) 
2902                         { /* check failed */
2903                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2904                         goto f_err;
2905                         }
2906                 else 
2907                         {
2908                         return 1;
2909                         }
2910                 }
2911 #endif
2912         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2913         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2914         EVP_PKEY_free(pkey);
2915
2916         
2917         /* Check that we have a certificate if we require one */
2918         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2919                 {
2920                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2921                 goto f_err;
2922                 }
2923 #ifndef OPENSSL_NO_DSA
2924         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2925                 {
2926                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2927                 goto f_err;
2928                 }
2929 #endif
2930 #ifndef OPENSSL_NO_RSA
2931         if ((alg_k & SSL_kRSA) &&
2932                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2933                 {
2934                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2935                 goto f_err;
2936                 }
2937 #endif
2938 #ifndef OPENSSL_NO_DH
2939         if ((alg_k & SSL_kEDH) &&
2940                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2941                 {
2942                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2943                 goto f_err;
2944                 }
2945         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2946                 {
2947                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2948                 goto f_err;
2949                 }
2950 #ifndef OPENSSL_NO_DSA
2951         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2952                 {
2953                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2954                 goto f_err;
2955                 }
2956 #endif
2957 #endif
2958
2959         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2960                 {
2961 #ifndef OPENSSL_NO_RSA
2962                 if (alg_k & SSL_kRSA)
2963                         {
2964                         if (rsa == NULL
2965                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2966                                 {
2967                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2968                                 goto f_err;
2969                                 }
2970                         }
2971                 else
2972 #endif
2973 #ifndef OPENSSL_NO_DH
2974                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2975                             {
2976                             if (dh == NULL
2977                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2978                                 {
2979                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2980                                 goto f_err;
2981                                 }
2982                         }
2983                 else
2984 #endif
2985                         {
2986                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2987                         goto f_err;
2988                         }
2989                 }
2990         return(1);
2991 f_err:
2992         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2993 err:
2994         return(0);
2995         }
2996
2997 /* Check to see if handshake is full or resumed. Usually this is just a
2998  * case of checking to see if a cache hit has occurred. In the case of
2999  * session tickets we have to check the next message to be sure.
3000  */
3001
3002 #ifndef OPENSSL_NO_TLSEXT
3003 int ssl3_check_finished(SSL *s)
3004         {
3005         int ok;
3006         long n;
3007         /* If we have no ticket it cannot be a resumed session. */
3008         if (!s->session->tlsext_tick)
3009                 return 1;
3010         /* this function is called when we really expect a Certificate
3011          * message, so permit appropriate message length */
3012         n=s->method->ssl_get_message(s,
3013                 SSL3_ST_CR_CERT_A,
3014                 SSL3_ST_CR_CERT_B,
3015                 -1,
3016                 s->max_cert_list,
3017                 &ok);
3018         if (!ok) return((int)n);
3019         s->s3->tmp.reuse_message = 1;
3020         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3021                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3022                 return 2;
3023
3024         return 1;
3025         }
3026 #endif
3027
3028 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3029         {
3030         int i = 0;
3031 #ifndef OPENSSL_NO_ENGINE
3032         if (s->ctx->client_cert_engine)
3033                 {
3034                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3035                                                 SSL_get_client_CA_list(s),
3036                                                 px509, ppkey, NULL, NULL, NULL);
3037                 if (i != 0)
3038                         return i;
3039                 }
3040 #endif
3041         if (s->ctx->client_cert_cb)
3042                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3043         return i;
3044         }