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->renegotiate=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
427 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NPN)
428                         s->state=SSL3_ST_CW_FINISHED_A;
429 #else
430                         if (s->next_proto_negotiated)
431                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
432                         else
433                                 s->state=SSL3_ST_CW_FINISHED_A;
434 #endif
435                         s->init_num=0;
436
437                         s->session->cipher=s->s3->tmp.new_cipher;
438 #ifdef OPENSSL_NO_COMP
439                         s->session->compress_meth=0;
440 #else
441                         if (s->s3->tmp.new_compression == NULL)
442                                 s->session->compress_meth=0;
443                         else
444                                 s->session->compress_meth=
445                                         s->s3->tmp.new_compression->id;
446 #endif
447                         if (!s->method->ssl3_enc->setup_key_block(s))
448                                 {
449                                 ret= -1;
450                                 goto end;
451                                 }
452
453                         if (!s->method->ssl3_enc->change_cipher_state(s,
454                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
455                                 {
456                                 ret= -1;
457                                 goto end;
458                                 }
459
460                         break;
461
462 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NPN)
463                 case SSL3_ST_CW_NEXT_PROTO_A:
464                 case SSL3_ST_CW_NEXT_PROTO_B:
465                         ret=ssl3_send_next_proto(s);
466                         if (ret <= 0) goto end;
467                         s->state=SSL3_ST_CW_FINISHED_A;
468                         break;
469 #endif
470
471                 case SSL3_ST_CW_FINISHED_A:
472                 case SSL3_ST_CW_FINISHED_B:
473                         ret=ssl3_send_finished(s,
474                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
475                                 s->method->ssl3_enc->client_finished_label,
476                                 s->method->ssl3_enc->client_finished_label_len);
477                         if (ret <= 0) goto end;
478                         s->state=SSL3_ST_CW_FLUSH;
479
480                         /* clear flags */
481                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
482                         if (s->hit)
483                                 {
484                                 s->s3->tmp.next_state=SSL_ST_OK;
485                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
486                                         {
487                                         s->state=SSL_ST_OK;
488                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
489                                         s->s3->delay_buf_pop_ret=0;
490                                         }
491                                 }
492                         else
493                                 {
494 #ifndef OPENSSL_NO_TLSEXT
495                                 /* Allow NewSessionTicket if ticket expected */
496                                 if (s->tlsext_ticket_expected)
497                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
498                                 else
499 #endif
500                                 
501                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
502                                 }
503                         s->init_num=0;
504                         break;
505
506 #ifndef OPENSSL_NO_TLSEXT
507                 case SSL3_ST_CR_SESSION_TICKET_A:
508                 case SSL3_ST_CR_SESSION_TICKET_B:
509                         ret=ssl3_get_new_session_ticket(s);
510                         if (ret <= 0) goto end;
511                         s->state=SSL3_ST_CR_FINISHED_A;
512                         s->init_num=0;
513                 break;
514
515                 case SSL3_ST_CR_CERT_STATUS_A:
516                 case SSL3_ST_CR_CERT_STATUS_B:
517                         ret=ssl3_get_cert_status(s);
518                         if (ret <= 0) goto end;
519                         s->state=SSL3_ST_CR_KEY_EXCH_A;
520                         s->init_num=0;
521                 break;
522 #endif
523
524                 case SSL3_ST_CR_FINISHED_A:
525                 case SSL3_ST_CR_FINISHED_B:
526
527                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
528                                 SSL3_ST_CR_FINISHED_B);
529                         if (ret <= 0) goto end;
530
531                         if (s->hit)
532                                 s->state=SSL3_ST_CW_CHANGE_A;
533                         else
534                                 s->state=SSL_ST_OK;
535                         s->init_num=0;
536                         break;
537
538                 case SSL3_ST_CW_FLUSH:
539                         s->rwstate=SSL_WRITING;
540                         if (BIO_flush(s->wbio) <= 0)
541                                 {
542                                 ret= -1;
543                                 goto end;
544                                 }
545                         s->rwstate=SSL_NOTHING;
546                         s->state=s->s3->tmp.next_state;
547                         break;
548
549                 case SSL_ST_OK:
550                         /* clean a few things up */
551                         ssl3_cleanup_key_block(s);
552
553                         if (s->init_buf != NULL)
554                                 {
555                                 BUF_MEM_free(s->init_buf);
556                                 s->init_buf=NULL;
557                                 }
558
559                         /* If we are not 'joining' the last two packets,
560                          * remove the buffering now */
561                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
562                                 ssl_free_wbio_buffer(s);
563                         /* else do it later in ssl3_write */
564
565                         s->init_num=0;
566                         s->renegotiate=0;
567                         s->new_session=0;
568
569                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
570                         if (s->hit) s->ctx->stats.sess_hit++;
571
572                         ret=1;
573                         /* s->server=0; */
574                         s->handshake_func=ssl3_connect;
575                         s->ctx->stats.sess_connect_good++;
576
577                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
578
579                         goto end;
580                         /* break; */
581                         
582                 default:
583                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
584                         ret= -1;
585                         goto end;
586                         /* break; */
587                         }
588
589                 /* did we do anything */
590                 if (!s->s3->tmp.reuse_message && !skip)
591                         {
592                         if (s->debug)
593                                 {
594                                 if ((ret=BIO_flush(s->wbio)) <= 0)
595                                         goto end;
596                                 }
597
598                         if ((cb != NULL) && (s->state != state))
599                                 {
600                                 new_state=s->state;
601                                 s->state=state;
602                                 cb(s,SSL_CB_CONNECT_LOOP,1);
603                                 s->state=new_state;
604                                 }
605                         }
606                 skip=0;
607                 }
608 end:
609         s->in_handshake--;
610         if (buf != NULL)
611                 BUF_MEM_free(buf);
612         if (cb != NULL)
613                 cb(s,SSL_CB_CONNECT_EXIT,ret);
614         return(ret);
615         }
616
617
618 int ssl3_client_hello(SSL *s)
619         {
620         unsigned char *buf;
621         unsigned char *p,*d;
622         int i;
623         unsigned long Time,l;
624 #ifndef OPENSSL_NO_COMP
625         int j;
626         SSL_COMP *comp;
627 #endif
628
629         buf=(unsigned char *)s->init_buf->data;
630         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
631                 {
632                 SSL_SESSION *sess = s->session;
633                 if ((sess == NULL) ||
634                         (sess->ssl_version != s->version) ||
635 #ifdef OPENSSL_NO_TLSEXT
636                         !sess->session_id_length ||
637 #else
638                         (!sess->session_id_length && !sess->tlsext_tick) ||
639 #endif
640                         (sess->not_resumable))
641                         {
642                         if (!ssl_get_new_session(s,0))
643                                 goto err;
644                         }
645                 /* else use the pre-loaded session */
646
647                 p=s->s3->client_random;
648                 Time=(unsigned long)time(NULL);                 /* Time */
649                 l2n(Time,p);
650                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
651                         goto err;
652
653                 /* Do the message type and length last */
654                 d=p= &(buf[4]);
655
656                 *(p++)=s->version>>8;
657                 *(p++)=s->version&0xff;
658                 s->client_version=s->version;
659
660                 /* Random stuff */
661                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
662                 p+=SSL3_RANDOM_SIZE;
663
664                 /* Session ID */
665                 if (s->new_session)
666                         i=0;
667                 else
668                         i=s->session->session_id_length;
669                 *(p++)=i;
670                 if (i != 0)
671                         {
672                         if (i > (int)sizeof(s->session->session_id))
673                                 {
674                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
675                                 goto err;
676                                 }
677                         memcpy(p,s->session->session_id,i);
678                         p+=i;
679                         }
680                 
681                 /* Ciphers supported */
682                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
683                 if (i == 0)
684                         {
685                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
686                         goto err;
687                         }
688                 s2n(i,p);
689                 p+=i;
690
691                 /* COMPRESSION */
692 #ifdef OPENSSL_NO_COMP
693                 *(p++)=1;
694 #else
695
696                 if ((s->options & SSL_OP_NO_COMPRESSION)
697                                         || !s->ctx->comp_methods)
698                         j=0;
699                 else
700                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
701                 *(p++)=1+j;
702                 for (i=0; i<j; i++)
703                         {
704                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
705                         *(p++)=comp->id;
706                         }
707 #endif
708                 *(p++)=0; /* Add the NULL method */
709
710 #ifndef OPENSSL_NO_TLSEXT
711                 /* TLS extensions*/
712                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
713                         {
714                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
715                         goto err;
716                         }
717                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
718                         {
719                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
720                         goto err;
721                         }
722 #endif
723                 
724                 l=(p-d);
725                 d=buf;
726                 *(d++)=SSL3_MT_CLIENT_HELLO;
727                 l2n3(l,d);
728
729                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
730                 /* number of bytes to write */
731                 s->init_num=p-buf;
732                 s->init_off=0;
733                 }
734
735         /* SSL3_ST_CW_CLNT_HELLO_B */
736         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
737 err:
738         return(-1);
739         }
740
741 int ssl3_get_server_hello(SSL *s)
742         {
743         STACK_OF(SSL_CIPHER) *sk;
744         const SSL_CIPHER *c;
745         unsigned char *p,*d;
746         int i,al,ok;
747         unsigned int j;
748         long n;
749 #ifndef OPENSSL_NO_COMP
750         SSL_COMP *comp;
751 #endif
752
753         n=s->method->ssl_get_message(s,
754                 SSL3_ST_CR_SRVR_HELLO_A,
755                 SSL3_ST_CR_SRVR_HELLO_B,
756                 -1,
757                 20000, /* ?? */
758                 &ok);
759
760         if (!ok) return((int)n);
761
762         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
763                 {
764                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
765                         {
766                         if ( s->d1->send_cookie == 0)
767                                 {
768                                 s->s3->tmp.reuse_message = 1;
769                                 return 1;
770                                 }
771                         else /* already sent a cookie */
772                                 {
773                                 al=SSL_AD_UNEXPECTED_MESSAGE;
774                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
775                                 goto f_err;
776                                 }
777                         }
778                 }
779         
780         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
781                 {
782                 al=SSL_AD_UNEXPECTED_MESSAGE;
783                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
784                 goto f_err;
785                 }
786
787         d=p=(unsigned char *)s->init_msg;
788
789         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
790                 {
791                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
792                 s->version=(s->version&0xff00)|p[1];
793                 al=SSL_AD_PROTOCOL_VERSION;
794                 goto f_err;
795                 }
796         p+=2;
797
798         /* load the server hello data */
799         /* load the server random */
800         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
801         p+=SSL3_RANDOM_SIZE;
802
803         /* get the session-id */
804         j= *(p++);
805
806         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
807                 {
808                 al=SSL_AD_ILLEGAL_PARAMETER;
809                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
810                 goto f_err;
811                 }
812
813 #ifndef OPENSSL_NO_TLSEXT
814         /* check if we want to resume the session based on external pre-shared secret */
815         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
816                 {
817                 SSL_CIPHER *pref_cipher=NULL;
818                 s->session->master_key_length=sizeof(s->session->master_key);
819                 if (s->tls_session_secret_cb(s, s->session->master_key,
820                                              &s->session->master_key_length,
821                                              NULL, &pref_cipher,
822                                              s->tls_session_secret_cb_arg))
823                         {
824                         s->session->cipher = pref_cipher ?
825                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
826                         }
827                 }
828 #endif /* OPENSSL_NO_TLSEXT */
829
830         if (j != 0 && j == s->session->session_id_length
831             && memcmp(p,s->session->session_id,j) == 0)
832             {
833             if(s->sid_ctx_length != s->session->sid_ctx_length
834                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
835                 {
836                 /* actually a client application bug */
837                 al=SSL_AD_ILLEGAL_PARAMETER;
838                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
839                 goto f_err;
840                 }
841             s->hit=1;
842             }
843         else    /* a miss or crap from the other end */
844                 {
845                 /* If we were trying for session-id reuse, make a new
846                  * SSL_SESSION so we don't stuff up other people */
847                 s->hit=0;
848                 if (s->session->session_id_length > 0)
849                         {
850                         if (!ssl_get_new_session(s,0))
851                                 {
852                                 al=SSL_AD_INTERNAL_ERROR;
853                                 goto f_err;
854                                 }
855                         }
856                 s->session->session_id_length=j;
857                 memcpy(s->session->session_id,p,j); /* j could be 0 */
858                 }
859         p+=j;
860         c=ssl_get_cipher_by_char(s,p);
861         if (c == NULL)
862                 {
863                 /* unknown cipher */
864                 al=SSL_AD_ILLEGAL_PARAMETER;
865                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
866                 goto f_err;
867                 }
868         p+=ssl_put_cipher_by_char(s,NULL,NULL);
869
870         sk=ssl_get_ciphers_by_id(s);
871         i=sk_SSL_CIPHER_find(sk,c);
872         if (i < 0)
873                 {
874                 /* we did not say we would use this cipher */
875                 al=SSL_AD_ILLEGAL_PARAMETER;
876                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
877                 goto f_err;
878                 }
879
880         /* Depending on the session caching (internal/external), the cipher
881            and/or cipher_id values may not be set. Make sure that
882            cipher_id is set and use it for comparison. */
883         if (s->session->cipher)
884                 s->session->cipher_id = s->session->cipher->id;
885         if (s->hit && (s->session->cipher_id != c->id))
886                 {
887                 if (!(s->options &
888                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
889                         {
890                         al=SSL_AD_ILLEGAL_PARAMETER;
891                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
892                         goto f_err;
893                         }
894                 }
895         s->s3->tmp.new_cipher=c;
896         if (!ssl3_digest_cached_records(s))
897                 goto f_err;
898
899         /* lets get the compression algorithm */
900         /* COMPRESSION */
901 #ifdef OPENSSL_NO_COMP
902         if (*(p++) != 0)
903                 {
904                 al=SSL_AD_ILLEGAL_PARAMETER;
905                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
906                 goto f_err;
907                 }
908         /* If compression is disabled we'd better not try to resume a session
909          * using compression.
910          */
911         if (s->session->compress_meth != 0)
912                 {
913                 al=SSL_AD_INTERNAL_ERROR;
914                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
915                 goto f_err;
916                 }
917 #else
918         j= *(p++);
919         if (s->hit && j != s->session->compress_meth)
920                 {
921                 al=SSL_AD_ILLEGAL_PARAMETER;
922                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
923                 goto f_err;
924                 }
925         if (j == 0)
926                 comp=NULL;
927         else if (s->options & SSL_OP_NO_COMPRESSION)
928                 {
929                 al=SSL_AD_ILLEGAL_PARAMETER;
930                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
931                 goto f_err;
932                 }
933         else
934                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
935         
936         if ((j != 0) && (comp == NULL))
937                 {
938                 al=SSL_AD_ILLEGAL_PARAMETER;
939                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
940                 goto f_err;
941                 }
942         else
943                 {
944                 s->s3->tmp.new_compression=comp;
945                 }
946 #endif
947
948 #ifndef OPENSSL_NO_TLSEXT
949         /* TLS extensions*/
950         if (s->version >= SSL3_VERSION)
951                 {
952                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
953                         {
954                         /* 'al' set by ssl_parse_serverhello_tlsext */
955                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
956                         goto f_err; 
957                         }
958                 if (ssl_check_serverhello_tlsext(s) <= 0)
959                         {
960                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
961                                 goto err;
962                         }
963                 }
964 #endif
965
966         if (p != (d+n))
967                 {
968                 /* wrong packet length */
969                 al=SSL_AD_DECODE_ERROR;
970                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
971                 goto err;
972                 }
973
974         return(1);
975 f_err:
976         ssl3_send_alert(s,SSL3_AL_FATAL,al);
977 err:
978         return(-1);
979         }
980
981 int ssl3_get_server_certificate(SSL *s)
982         {
983         int al,i,ok,ret= -1;
984         unsigned long n,nc,llen,l;
985         X509 *x=NULL;
986         const unsigned char *q,*p;
987         unsigned char *d;
988         STACK_OF(X509) *sk=NULL;
989         SESS_CERT *sc;
990         EVP_PKEY *pkey=NULL;
991         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
992
993         n=s->method->ssl_get_message(s,
994                 SSL3_ST_CR_CERT_A,
995                 SSL3_ST_CR_CERT_B,
996                 -1,
997                 s->max_cert_list,
998                 &ok);
999
1000         if (!ok) return((int)n);
1001
1002         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1003                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 
1004                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1005                 {
1006                 s->s3->tmp.reuse_message=1;
1007                 return(1);
1008                 }
1009
1010         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1011                 {
1012                 al=SSL_AD_UNEXPECTED_MESSAGE;
1013                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1014                 goto f_err;
1015                 }
1016         p=d=(unsigned char *)s->init_msg;
1017
1018         if ((sk=sk_X509_new_null()) == NULL)
1019                 {
1020                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1021                 goto err;
1022                 }
1023
1024         n2l3(p,llen);
1025         if (llen+3 != n)
1026                 {
1027                 al=SSL_AD_DECODE_ERROR;
1028                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1029                 goto f_err;
1030                 }
1031         for (nc=0; nc<llen; )
1032                 {
1033                 n2l3(p,l);
1034                 if ((l+nc+3) > llen)
1035                         {
1036                         al=SSL_AD_DECODE_ERROR;
1037                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1038                         goto f_err;
1039                         }
1040
1041                 q=p;
1042                 x=d2i_X509(NULL,&q,l);
1043                 if (x == NULL)
1044                         {
1045                         al=SSL_AD_BAD_CERTIFICATE;
1046                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1047                         goto f_err;
1048                         }
1049                 if (q != (p+l))
1050                         {
1051                         al=SSL_AD_DECODE_ERROR;
1052                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1053                         goto f_err;
1054                         }
1055                 if (!sk_X509_push(sk,x))
1056                         {
1057                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1058                         goto err;
1059                         }
1060                 x=NULL;
1061                 nc+=l+3;
1062                 p=q;
1063                 }
1064
1065         i=ssl_verify_cert_chain(s,sk);
1066         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1067 #ifndef OPENSSL_NO_KRB5
1068             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1069                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1070 #endif /* OPENSSL_NO_KRB5 */
1071                 )
1072                 {
1073                 al=ssl_verify_alarm_type(s->verify_result);
1074                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1075                 goto f_err; 
1076                 }
1077         ERR_clear_error(); /* but we keep s->verify_result */
1078
1079         sc=ssl_sess_cert_new();
1080         if (sc == NULL) goto err;
1081
1082         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1083         s->session->sess_cert=sc;
1084
1085         sc->cert_chain=sk;
1086         /* Inconsistency alert: cert_chain does include the peer's
1087          * certificate, which we don't include in s3_srvr.c */
1088         x=sk_X509_value(sk,0);
1089         sk=NULL;
1090         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1091
1092         pkey=X509_get_pubkey(x);
1093
1094         /* VRS: allow null cert if auth == KRB5 */
1095         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1096                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1097                     ? 0 : 1;
1098
1099 #ifdef KSSL_DEBUG
1100         printf("pkey,x = %p, %p\n", pkey,x);
1101         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1102         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1103                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1104 #endif    /* KSSL_DEBUG */
1105
1106         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1107                 {
1108                 x=NULL;
1109                 al=SSL3_AL_FATAL;
1110                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1111                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1112                 goto f_err;
1113                 }
1114
1115         i=ssl_cert_type(x,pkey);
1116         if (need_cert && i < 0)
1117                 {
1118                 x=NULL;
1119                 al=SSL3_AL_FATAL;
1120                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1121                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1122                 goto f_err;
1123                 }
1124
1125         if (need_cert)
1126                 {
1127                 sc->peer_cert_type=i;
1128                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1129                 /* Why would the following ever happen?
1130                  * We just created sc a couple of lines ago. */
1131                 if (sc->peer_pkeys[i].x509 != NULL)
1132                         X509_free(sc->peer_pkeys[i].x509);
1133                 sc->peer_pkeys[i].x509=x;
1134                 sc->peer_key= &(sc->peer_pkeys[i]);
1135
1136                 if (s->session->peer != NULL)
1137                         X509_free(s->session->peer);
1138                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1139                 s->session->peer=x;
1140                 }
1141         else
1142                 {
1143                 sc->peer_cert_type=i;
1144                 sc->peer_key= NULL;
1145
1146                 if (s->session->peer != NULL)
1147                         X509_free(s->session->peer);
1148                 s->session->peer=NULL;
1149                 }
1150         s->session->verify_result = s->verify_result;
1151
1152         x=NULL;
1153         ret=1;
1154
1155         if (0)
1156                 {
1157 f_err:
1158                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1159                 }
1160 err:
1161         EVP_PKEY_free(pkey);
1162         X509_free(x);
1163         sk_X509_pop_free(sk,X509_free);
1164         return(ret);
1165         }
1166
1167 int ssl3_get_key_exchange(SSL *s)
1168         {
1169 #ifndef OPENSSL_NO_RSA
1170         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1171 #endif
1172         EVP_MD_CTX md_ctx;
1173         unsigned char *param,*p;
1174         int al,i,j,param_len,ok;
1175         long n,alg_k,alg_a;
1176         EVP_PKEY *pkey=NULL;
1177 #ifndef OPENSSL_NO_RSA
1178         RSA *rsa=NULL;
1179 #endif
1180 #ifndef OPENSSL_NO_DH
1181         DH *dh=NULL;
1182 #endif
1183 #ifndef OPENSSL_NO_ECDH
1184         EC_KEY *ecdh = NULL;
1185         BN_CTX *bn_ctx = NULL;
1186         EC_POINT *srvr_ecpoint = NULL;
1187         int curve_nid = 0;
1188         int encoded_pt_len = 0;
1189 #endif
1190
1191         /* use same message size as in ssl3_get_certificate_request()
1192          * as ServerKeyExchange message may be skipped */
1193         n=s->method->ssl_get_message(s,
1194                 SSL3_ST_CR_KEY_EXCH_A,
1195                 SSL3_ST_CR_KEY_EXCH_B,
1196                 -1,
1197                 s->max_cert_list,
1198                 &ok);
1199         if (!ok) return((int)n);
1200
1201         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1202                 {
1203 #ifndef OPENSSL_NO_PSK
1204                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1205                    omitted if no identity hint is sent. Set
1206                    session->sess_cert anyway to avoid problems
1207                    later.*/
1208                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1209                         {
1210                         s->session->sess_cert=ssl_sess_cert_new();
1211                         if (s->ctx->psk_identity_hint)
1212                                 OPENSSL_free(s->ctx->psk_identity_hint);
1213                         s->ctx->psk_identity_hint = NULL;
1214                         }
1215 #endif
1216                 s->s3->tmp.reuse_message=1;
1217                 return(1);
1218                 }
1219
1220         param=p=(unsigned char *)s->init_msg;
1221         if (s->session->sess_cert != NULL)
1222                 {
1223 #ifndef OPENSSL_NO_RSA
1224                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1225                         {
1226                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1227                         s->session->sess_cert->peer_rsa_tmp=NULL;
1228                         }
1229 #endif
1230 #ifndef OPENSSL_NO_DH
1231                 if (s->session->sess_cert->peer_dh_tmp)
1232                         {
1233                         DH_free(s->session->sess_cert->peer_dh_tmp);
1234                         s->session->sess_cert->peer_dh_tmp=NULL;
1235                         }
1236 #endif
1237 #ifndef OPENSSL_NO_ECDH
1238                 if (s->session->sess_cert->peer_ecdh_tmp)
1239                         {
1240                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1241                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1242                         }
1243 #endif
1244                 }
1245         else
1246                 {
1247                 s->session->sess_cert=ssl_sess_cert_new();
1248                 }
1249
1250         param_len=0;
1251         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1252         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1253         EVP_MD_CTX_init(&md_ctx);
1254
1255 #ifndef OPENSSL_NO_PSK
1256         if (alg_k & SSL_kPSK)
1257                 {
1258                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1259
1260                 al=SSL_AD_HANDSHAKE_FAILURE;
1261                 n2s(p,i);
1262                 param_len=i+2;
1263                 /* Store PSK identity hint for later use, hint is used
1264                  * in ssl3_send_client_key_exchange.  Assume that the
1265                  * maximum length of a PSK identity hint can be as
1266                  * long as the maximum length of a PSK identity. */
1267                 if (i > PSK_MAX_IDENTITY_LEN)
1268                         {
1269                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1270                                 SSL_R_DATA_LENGTH_TOO_LONG);
1271                         goto f_err;
1272                         }
1273                 if (param_len > n)
1274                         {
1275                         al=SSL_AD_DECODE_ERROR;
1276                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1277                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1278                         goto f_err;
1279                         }
1280                 /* If received PSK identity hint contains NULL
1281                  * characters, the hint is truncated from the first
1282                  * NULL. p may not be ending with NULL, so create a
1283                  * NULL-terminated string. */
1284                 memcpy(tmp_id_hint, p, i);
1285                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1286                 if (s->ctx->psk_identity_hint != NULL)
1287                         OPENSSL_free(s->ctx->psk_identity_hint);
1288                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1289                 if (s->ctx->psk_identity_hint == NULL)
1290                         {
1291                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1292                         goto f_err;
1293                         }          
1294
1295                 p+=i;
1296                 n-=param_len;
1297                 }
1298         else
1299 #endif /* !OPENSSL_NO_PSK */
1300 #ifndef OPENSSL_NO_RSA
1301         if (alg_k & SSL_kRSA)
1302                 {
1303                 if ((rsa=RSA_new()) == NULL)
1304                         {
1305                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1306                         goto err;
1307                         }
1308                 n2s(p,i);
1309                 param_len=i+2;
1310                 if (param_len > n)
1311                         {
1312                         al=SSL_AD_DECODE_ERROR;
1313                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1314                         goto f_err;
1315                         }
1316                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1317                         {
1318                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1319                         goto err;
1320                         }
1321                 p+=i;
1322
1323                 n2s(p,i);
1324                 param_len+=i+2;
1325                 if (param_len > n)
1326                         {
1327                         al=SSL_AD_DECODE_ERROR;
1328                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1329                         goto f_err;
1330                         }
1331                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1332                         {
1333                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1334                         goto err;
1335                         }
1336                 p+=i;
1337                 n-=param_len;
1338
1339                 /* this should be because we are using an export cipher */
1340                 if (alg_a & SSL_aRSA)
1341                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1342                 else
1343                         {
1344                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1345                         goto err;
1346                         }
1347                 s->session->sess_cert->peer_rsa_tmp=rsa;
1348                 rsa=NULL;
1349                 }
1350 #else /* OPENSSL_NO_RSA */
1351         if (0)
1352                 ;
1353 #endif
1354 #ifndef OPENSSL_NO_DH
1355         else if (alg_k & SSL_kEDH)
1356                 {
1357                 if ((dh=DH_new()) == NULL)
1358                         {
1359                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1360                         goto err;
1361                         }
1362                 n2s(p,i);
1363                 param_len=i+2;
1364                 if (param_len > n)
1365                         {
1366                         al=SSL_AD_DECODE_ERROR;
1367                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1368                         goto f_err;
1369                         }
1370                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1371                         {
1372                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1373                         goto err;
1374                         }
1375                 p+=i;
1376
1377                 n2s(p,i);
1378                 param_len+=i+2;
1379                 if (param_len > n)
1380                         {
1381                         al=SSL_AD_DECODE_ERROR;
1382                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1383                         goto f_err;
1384                         }
1385                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1386                         {
1387                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1388                         goto err;
1389                         }
1390                 p+=i;
1391
1392                 n2s(p,i);
1393                 param_len+=i+2;
1394                 if (param_len > n)
1395                         {
1396                         al=SSL_AD_DECODE_ERROR;
1397                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1398                         goto f_err;
1399                         }
1400                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1401                         {
1402                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1403                         goto err;
1404                         }
1405                 p+=i;
1406                 n-=param_len;
1407
1408 #ifndef OPENSSL_NO_RSA
1409                 if (alg_a & SSL_aRSA)
1410                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1411 #else
1412                 if (0)
1413                         ;
1414 #endif
1415 #ifndef OPENSSL_NO_DSA
1416                 else if (alg_a & SSL_aDSS)
1417                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1418 #endif
1419                 /* else anonymous DH, so no certificate or pkey. */
1420
1421                 s->session->sess_cert->peer_dh_tmp=dh;
1422                 dh=NULL;
1423                 }
1424         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1425                 {
1426                 al=SSL_AD_ILLEGAL_PARAMETER;
1427                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1428                 goto f_err;
1429                 }
1430 #endif /* !OPENSSL_NO_DH */
1431
1432 #ifndef OPENSSL_NO_ECDH
1433         else if (alg_k & SSL_kEECDH)
1434                 {
1435                 EC_GROUP *ngroup;
1436                 const EC_GROUP *group;
1437
1438                 if ((ecdh=EC_KEY_new()) == NULL)
1439                         {
1440                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1441                         goto err;
1442                         }
1443
1444                 /* Extract elliptic curve parameters and the
1445                  * server's ephemeral ECDH public key.
1446                  * Keep accumulating lengths of various components in
1447                  * param_len and make sure it never exceeds n.
1448                  */
1449
1450                 /* XXX: For now we only support named (not generic) curves
1451                  * and the ECParameters in this case is just three bytes.
1452                  */
1453                 param_len=3;
1454                 if ((param_len > n) ||
1455                     (*p != NAMED_CURVE_TYPE) || 
1456                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)) 
1457                         {
1458                         al=SSL_AD_INTERNAL_ERROR;
1459                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1460                         goto f_err;
1461                         }
1462
1463                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1464                 if (ngroup == NULL)
1465                         {
1466                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1467                         goto err;
1468                         }
1469                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1470                         {
1471                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1472                         goto err;
1473                         }
1474                 EC_GROUP_free(ngroup);
1475
1476                 group = EC_KEY_get0_group(ecdh);
1477
1478                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1479                     (EC_GROUP_get_degree(group) > 163))
1480                         {
1481                         al=SSL_AD_EXPORT_RESTRICTION;
1482                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1483                         goto f_err;
1484                         }
1485
1486                 p+=3;
1487
1488                 /* Next, get the encoded ECPoint */
1489                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1490                     ((bn_ctx = BN_CTX_new()) == NULL))
1491                         {
1492                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1493                         goto err;
1494                         }
1495
1496                 encoded_pt_len = *p;  /* length of encoded point */
1497                 p+=1;
1498                 param_len += (1 + encoded_pt_len);
1499                 if ((param_len > n) ||
1500                     (EC_POINT_oct2point(group, srvr_ecpoint, 
1501                         p, encoded_pt_len, bn_ctx) == 0))
1502                         {
1503                         al=SSL_AD_DECODE_ERROR;
1504                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1505                         goto f_err;
1506                         }
1507
1508                 n-=param_len;
1509                 p+=encoded_pt_len;
1510
1511                 /* The ECC/TLS specification does not mention
1512                  * the use of DSA to sign ECParameters in the server
1513                  * key exchange message. We do support RSA and ECDSA.
1514                  */
1515                 if (0) ;
1516 #ifndef OPENSSL_NO_RSA
1517                 else if (alg_a & SSL_aRSA)
1518                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1519 #endif
1520 #ifndef OPENSSL_NO_ECDSA
1521                 else if (alg_a & SSL_aECDSA)
1522                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1523 #endif
1524                 /* else anonymous ECDH, so no certificate or pkey. */
1525                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1526                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1527                 ecdh=NULL;
1528                 BN_CTX_free(bn_ctx);
1529                 EC_POINT_free(srvr_ecpoint);
1530                 srvr_ecpoint = NULL;
1531                 }
1532         else if (alg_k)
1533                 {
1534                 al=SSL_AD_UNEXPECTED_MESSAGE;
1535                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1536                 goto f_err;
1537                 }
1538 #endif /* !OPENSSL_NO_ECDH */
1539
1540
1541         /* p points to the next byte, there are 'n' bytes left */
1542
1543         /* if it was signed, check the signature */
1544         if (pkey != NULL)
1545                 {
1546                 n2s(p,i);
1547                 n-=2;
1548                 j=EVP_PKEY_size(pkey);
1549
1550                 if ((i != n) || (n > j) || (n <= 0))
1551                         {
1552                         /* wrong packet length */
1553                         al=SSL_AD_DECODE_ERROR;
1554                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1555                         goto f_err;
1556                         }
1557
1558 #ifndef OPENSSL_NO_RSA
1559                 if (pkey->type == EVP_PKEY_RSA)
1560                         {
1561                         int num;
1562
1563                         j=0;
1564                         q=md_buf;
1565                         for (num=2; num > 0; num--)
1566                                 {
1567                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1568                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1569                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1570                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1571                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1572                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1573                                 q+=i;
1574                                 j+=i;
1575                                 }
1576                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1577                                                                 pkey->pkey.rsa);
1578                         if (i < 0)
1579                                 {
1580                                 al=SSL_AD_DECRYPT_ERROR;
1581                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1582                                 goto f_err;
1583                                 }
1584                         if (i == 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_DSA
1595                         if (pkey->type == EVP_PKEY_DSA)
1596                         {
1597                         /* lets do DSS */
1598                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), 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 #ifndef OPENSSL_NO_ECDSA
1613                         if (pkey->type == EVP_PKEY_EC)
1614                         {
1615                         /* let's do ECDSA */
1616                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1617                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1618                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1619                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1620                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1621                                 {
1622                                 /* bad signature */
1623                                 al=SSL_AD_DECRYPT_ERROR;
1624                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1625                                 goto f_err;
1626                                 }
1627                         }
1628                 else
1629 #endif
1630                         {
1631                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1632                         goto err;
1633                         }
1634                 }
1635         else
1636                 {
1637                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1638                         /* aNULL or kPSK do not need public keys */
1639                         {
1640                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1641                         goto err;
1642                         }
1643                 /* still data left over */
1644                 if (n != 0)
1645                         {
1646                         al=SSL_AD_DECODE_ERROR;
1647                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1648                         goto f_err;
1649                         }
1650                 }
1651         EVP_PKEY_free(pkey);
1652         EVP_MD_CTX_cleanup(&md_ctx);
1653         return(1);
1654 f_err:
1655         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1656 err:
1657         EVP_PKEY_free(pkey);
1658 #ifndef OPENSSL_NO_RSA
1659         if (rsa != NULL)
1660                 RSA_free(rsa);
1661 #endif
1662 #ifndef OPENSSL_NO_DH
1663         if (dh != NULL)
1664                 DH_free(dh);
1665 #endif
1666 #ifndef OPENSSL_NO_ECDH
1667         BN_CTX_free(bn_ctx);
1668         EC_POINT_free(srvr_ecpoint);
1669         if (ecdh != NULL)
1670                 EC_KEY_free(ecdh);
1671 #endif
1672         EVP_MD_CTX_cleanup(&md_ctx);
1673         return(-1);
1674         }
1675
1676 int ssl3_get_certificate_request(SSL *s)
1677         {
1678         int ok,ret=0;
1679         unsigned long n,nc,l;
1680         unsigned int llen,ctype_num,i;
1681         X509_NAME *xn=NULL;
1682         const unsigned char *p,*q;
1683         unsigned char *d;
1684         STACK_OF(X509_NAME) *ca_sk=NULL;
1685
1686         n=s->method->ssl_get_message(s,
1687                 SSL3_ST_CR_CERT_REQ_A,
1688                 SSL3_ST_CR_CERT_REQ_B,
1689                 -1,
1690                 s->max_cert_list,
1691                 &ok);
1692
1693         if (!ok) return((int)n);
1694
1695         s->s3->tmp.cert_req=0;
1696
1697         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1698                 {
1699                 s->s3->tmp.reuse_message=1;
1700                 return(1);
1701                 }
1702
1703         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1704                 {
1705                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1706                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1707                 goto err;
1708                 }
1709
1710         /* TLS does not like anon-DH with client cert */
1711         if (s->version > SSL3_VERSION)
1712                 {
1713                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1714                         {
1715                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1716                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1717                         goto err;
1718                         }
1719                 }
1720
1721         p=d=(unsigned char *)s->init_msg;
1722
1723         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1724                 {
1725                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1726                 goto err;
1727                 }
1728
1729         /* get the certificate types */
1730         ctype_num= *(p++);
1731         if (ctype_num > SSL3_CT_NUMBER)
1732                 ctype_num=SSL3_CT_NUMBER;
1733         for (i=0; i<ctype_num; i++)
1734                 s->s3->tmp.ctype[i]= p[i];
1735         p+=ctype_num;
1736
1737         /* get the CA RDNs */
1738         n2s(p,llen);
1739 #if 0
1740 {
1741 FILE *out;
1742 out=fopen("/tmp/vsign.der","w");
1743 fwrite(p,1,llen,out);
1744 fclose(out);
1745 }
1746 #endif
1747
1748         if ((llen+ctype_num+2+1) != n)
1749                 {
1750                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1751                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1752                 goto err;
1753                 }
1754
1755         for (nc=0; nc<llen; )
1756                 {
1757                 n2s(p,l);
1758                 if ((l+nc+2) > llen)
1759                         {
1760                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1761                                 goto cont; /* netscape bugs */
1762                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1763                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1764                         goto err;
1765                         }
1766
1767                 q=p;
1768
1769                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1770                         {
1771                         /* If netscape tolerance is on, ignore errors */
1772                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1773                                 goto cont;
1774                         else
1775                                 {
1776                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1777                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1778                                 goto err;
1779                                 }
1780                         }
1781
1782                 if (q != (p+l))
1783                         {
1784                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1785                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1786                         goto err;
1787                         }
1788                 if (!sk_X509_NAME_push(ca_sk,xn))
1789                         {
1790                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1791                         goto err;
1792                         }
1793
1794                 p+=l;
1795                 nc+=l+2;
1796                 }
1797
1798         if (0)
1799                 {
1800 cont:
1801                 ERR_clear_error();
1802                 }
1803
1804         /* we should setup a certificate to return.... */
1805         s->s3->tmp.cert_req=1;
1806         s->s3->tmp.ctype_num=ctype_num;
1807         if (s->s3->tmp.ca_names != NULL)
1808                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1809         s->s3->tmp.ca_names=ca_sk;
1810         ca_sk=NULL;
1811
1812         ret=1;
1813 err:
1814         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1815         return(ret);
1816         }
1817
1818 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1819         {
1820         return(X509_NAME_cmp(*a,*b));
1821         }
1822 #ifndef OPENSSL_NO_TLSEXT
1823 int ssl3_get_new_session_ticket(SSL *s)
1824         {
1825         int ok,al,ret=0, ticklen;
1826         long n;
1827         const unsigned char *p;
1828         unsigned char *d;
1829
1830         n=s->method->ssl_get_message(s,
1831                 SSL3_ST_CR_SESSION_TICKET_A,
1832                 SSL3_ST_CR_SESSION_TICKET_B,
1833                 -1,
1834                 16384,
1835                 &ok);
1836
1837         if (!ok)
1838                 return((int)n);
1839
1840         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1841                 {
1842                 s->s3->tmp.reuse_message=1;
1843                 return(1);
1844                 }
1845         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1846                 {
1847                 al=SSL_AD_UNEXPECTED_MESSAGE;
1848                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1849                 goto f_err;
1850                 }
1851         if (n < 6)
1852                 {
1853                 /* need at least ticket_lifetime_hint + ticket length */
1854                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1855                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1856                 goto f_err;
1857                 }
1858
1859         p=d=(unsigned char *)s->init_msg;
1860         n2l(p, s->session->tlsext_tick_lifetime_hint);
1861         n2s(p, ticklen);
1862         /* ticket_lifetime_hint + ticket_length + ticket */
1863         if (ticklen + 6 != n)
1864                 {
1865                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1866                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1867                 goto f_err;
1868                 }
1869         if (s->session->tlsext_tick)
1870                 {
1871                 OPENSSL_free(s->session->tlsext_tick);
1872                 s->session->tlsext_ticklen = 0;
1873                 }
1874         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1875         if (!s->session->tlsext_tick)
1876                 {
1877                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1878                 goto err;
1879                 }
1880         memcpy(s->session->tlsext_tick, p, ticklen);
1881         s->session->tlsext_ticklen = ticklen;
1882         /* There are two ways to detect a resumed ticket sesion.
1883          * One is to set an appropriate session ID and then the server
1884          * must return a match in ServerHello. This allows the normal
1885          * client session ID matching to work and we know much 
1886          * earlier that the ticket has been accepted.
1887          * 
1888          * The other way is to set zero length session ID when the
1889          * ticket is presented and rely on the handshake to determine
1890          * session resumption.
1891          *
1892          * We choose the former approach because this fits in with
1893          * assumptions elsewhere in OpenSSL. The session ID is set
1894          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1895          * ticket.
1896          */ 
1897         EVP_Digest(p, ticklen,
1898                         s->session->session_id, &s->session->session_id_length,
1899 #ifndef OPENSSL_NO_SHA256
1900                                                         EVP_sha256(), NULL);
1901 #else
1902                                                         EVP_sha1(), NULL);
1903 #endif
1904         ret=1;
1905         return(ret);
1906 f_err:
1907         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1908 err:
1909         return(-1);
1910         }
1911
1912 int ssl3_get_cert_status(SSL *s)
1913         {
1914         int ok, al;
1915         unsigned long resplen,n;
1916         const unsigned char *p;
1917
1918         n=s->method->ssl_get_message(s,
1919                 SSL3_ST_CR_CERT_STATUS_A,
1920                 SSL3_ST_CR_CERT_STATUS_B,
1921                 SSL3_MT_CERTIFICATE_STATUS,
1922                 16384,
1923                 &ok);
1924
1925         if (!ok) return((int)n);
1926         if (n < 4)
1927                 {
1928                 /* need at least status type + length */
1929                 al = SSL_AD_DECODE_ERROR;
1930                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1931                 goto f_err;
1932                 }
1933         p = (unsigned char *)s->init_msg;
1934         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1935                 {
1936                 al = SSL_AD_DECODE_ERROR;
1937                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1938                 goto f_err;
1939                 }
1940         n2l3(p, resplen);
1941         if (resplen + 4 != n)
1942                 {
1943                 al = SSL_AD_DECODE_ERROR;
1944                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1945                 goto f_err;
1946                 }
1947         if (s->tlsext_ocsp_resp)
1948                 OPENSSL_free(s->tlsext_ocsp_resp);
1949         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1950         if (!s->tlsext_ocsp_resp)
1951                 {
1952                 al = SSL_AD_INTERNAL_ERROR;
1953                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1954                 goto f_err;
1955                 }
1956         s->tlsext_ocsp_resplen = resplen;
1957         if (s->ctx->tlsext_status_cb)
1958                 {
1959                 int ret;
1960                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1961                 if (ret == 0)
1962                         {
1963                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1964                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1965                         goto f_err;
1966                         }
1967                 if (ret < 0)
1968                         {
1969                         al = SSL_AD_INTERNAL_ERROR;
1970                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1971                         goto f_err;
1972                         }
1973                 }
1974         return 1;
1975 f_err:
1976         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1977         return(-1);
1978         }
1979 #endif
1980
1981 int ssl3_get_server_done(SSL *s)
1982         {
1983         int ok,ret=0;
1984         long n;
1985
1986         n=s->method->ssl_get_message(s,
1987                 SSL3_ST_CR_SRVR_DONE_A,
1988                 SSL3_ST_CR_SRVR_DONE_B,
1989                 SSL3_MT_SERVER_DONE,
1990                 30, /* should be very small, like 0 :-) */
1991                 &ok);
1992
1993         if (!ok) return((int)n);
1994         if (n > 0)
1995                 {
1996                 /* should contain no data */
1997                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1998                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1999                 return -1;
2000                 }
2001         ret=1;
2002         return(ret);
2003         }
2004
2005
2006 int ssl3_send_client_key_exchange(SSL *s)
2007         {
2008         unsigned char *p,*d;
2009         int n;
2010         unsigned long alg_k;
2011 #ifndef OPENSSL_NO_RSA
2012         unsigned char *q;
2013         EVP_PKEY *pkey=NULL;
2014 #endif
2015 #ifndef OPENSSL_NO_KRB5
2016         KSSL_ERR kssl_err;
2017 #endif /* OPENSSL_NO_KRB5 */
2018 #ifndef OPENSSL_NO_ECDH
2019         EC_KEY *clnt_ecdh = NULL;
2020         const EC_POINT *srvr_ecpoint = NULL;
2021         EVP_PKEY *srvr_pub_pkey = NULL;
2022         unsigned char *encodedPoint = NULL;
2023         int encoded_pt_len = 0;
2024         BN_CTX * bn_ctx = NULL;
2025 #endif
2026
2027         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2028                 {
2029                 d=(unsigned char *)s->init_buf->data;
2030                 p= &(d[4]);
2031
2032                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2033
2034                 /* Fool emacs indentation */
2035                 if (0) {}
2036 #ifndef OPENSSL_NO_RSA
2037                 else if (alg_k & SSL_kRSA)
2038                         {
2039                         RSA *rsa;
2040                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2041
2042                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2043                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2044                         else
2045                                 {
2046                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2047                                 if ((pkey == NULL) ||
2048                                         (pkey->type != EVP_PKEY_RSA) ||
2049                                         (pkey->pkey.rsa == NULL))
2050                                         {
2051                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2052                                         goto err;
2053                                         }
2054                                 rsa=pkey->pkey.rsa;
2055                                 EVP_PKEY_free(pkey);
2056                                 }
2057                                 
2058                         tmp_buf[0]=s->client_version>>8;
2059                         tmp_buf[1]=s->client_version&0xff;
2060                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2061                                         goto err;
2062
2063                         s->session->master_key_length=sizeof tmp_buf;
2064
2065                         q=p;
2066                         /* Fix buf for TLS and beyond */
2067                         if (s->version > SSL3_VERSION)
2068                                 p+=2;
2069                         n=RSA_public_encrypt(sizeof tmp_buf,
2070                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2071 #ifdef PKCS1_CHECK
2072                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2073                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2074 #endif
2075                         if (n <= 0)
2076                                 {
2077                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2078                                 goto err;
2079                                 }
2080
2081                         /* Fix buf for TLS and beyond */
2082                         if (s->version > SSL3_VERSION)
2083                                 {
2084                                 s2n(n,q);
2085                                 n+=2;
2086                                 }
2087
2088                         s->session->master_key_length=
2089                                 s->method->ssl3_enc->generate_master_secret(s,
2090                                         s->session->master_key,
2091                                         tmp_buf,sizeof tmp_buf);
2092                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2093                         }
2094 #endif
2095 #ifndef OPENSSL_NO_KRB5
2096                 else if (alg_k & SSL_kKRB5)
2097                         {
2098                         krb5_error_code krb5rc;
2099                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2100                         /*  krb5_data   krb5_ap_req;  */
2101                         krb5_data       *enc_ticket;
2102                         krb5_data       authenticator, *authp = NULL;
2103                         EVP_CIPHER_CTX  ciph_ctx;
2104                         const EVP_CIPHER *enc = NULL;
2105                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2106                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2107                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
2108                                                 + EVP_MAX_IV_LENGTH];
2109                         int             padl, outl = sizeof(epms);
2110
2111                         EVP_CIPHER_CTX_init(&ciph_ctx);
2112
2113 #ifdef KSSL_DEBUG
2114                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2115                                 alg_k, SSL_kKRB5);
2116 #endif  /* KSSL_DEBUG */
2117
2118                         authp = NULL;
2119 #ifdef KRB5SENDAUTH
2120                         if (KRB5SENDAUTH)  authp = &authenticator;
2121 #endif  /* KRB5SENDAUTH */
2122
2123                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2124                                 &kssl_err);
2125                         enc = kssl_map_enc(kssl_ctx->enctype);
2126                         if (enc == NULL)
2127                             goto err;
2128 #ifdef KSSL_DEBUG
2129                         {
2130                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2131                         if (krb5rc && kssl_err.text)
2132                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2133                         }
2134 #endif  /* KSSL_DEBUG */
2135
2136                         if (krb5rc)
2137                                 {
2138                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2139                                                 SSL_AD_HANDSHAKE_FAILURE);
2140                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2141                                                 kssl_err.reason);
2142                                 goto err;
2143                                 }
2144
2145                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2146                         **  in place of RFC 2712 KerberosWrapper, as in:
2147                         **
2148                         **  Send ticket (copy to *p, set n = length)
2149                         **  n = krb5_ap_req.length;
2150                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2151                         **  if (krb5_ap_req.data)  
2152                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2153                         **
2154                         **  Now using real RFC 2712 KerberosWrapper
2155                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2156                         **  Note: 2712 "opaque" types are here replaced
2157                         **  with a 2-byte length followed by the value.
2158                         **  Example:
2159                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2160                         **  Where "xx xx" = length bytes.  Shown here with
2161                         **  optional authenticator omitted.
2162                         */
2163
2164                         /*  KerberosWrapper.Ticket              */
2165                         s2n(enc_ticket->length,p);
2166                         memcpy(p, enc_ticket->data, enc_ticket->length);
2167                         p+= enc_ticket->length;
2168                         n = enc_ticket->length + 2;
2169
2170                         /*  KerberosWrapper.Authenticator       */
2171                         if (authp  &&  authp->length)  
2172                                 {
2173                                 s2n(authp->length,p);
2174                                 memcpy(p, authp->data, authp->length);
2175                                 p+= authp->length;
2176                                 n+= authp->length + 2;
2177                                 
2178                                 free(authp->data);
2179                                 authp->data = NULL;
2180                                 authp->length = 0;
2181                                 }
2182                         else
2183                                 {
2184                                 s2n(0,p);/*  null authenticator length  */
2185                                 n+=2;
2186                                 }
2187  
2188                             tmp_buf[0]=s->client_version>>8;
2189                             tmp_buf[1]=s->client_version&0xff;
2190                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2191                                 goto err;
2192
2193                         /*  20010420 VRS.  Tried it this way; failed.
2194                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2195                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2196                         **                              kssl_ctx->length);
2197                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2198                         */
2199
2200                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2201                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2202                                 kssl_ctx->key,iv);
2203                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2204                                 sizeof tmp_buf);
2205                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2206                         outl += padl;
2207                         if (outl > (int)sizeof epms)
2208                                 {
2209                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2210                                 goto err;
2211                                 }
2212                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2213
2214                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2215                         s2n(outl,p);
2216                         memcpy(p, epms, outl);
2217                         p+=outl;
2218                         n+=outl + 2;
2219
2220                         s->session->master_key_length=
2221                                 s->method->ssl3_enc->generate_master_secret(s,
2222                                         s->session->master_key,
2223                                         tmp_buf, sizeof tmp_buf);
2224
2225                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2226                         OPENSSL_cleanse(epms, outl);
2227                         }
2228 #endif
2229 #ifndef OPENSSL_NO_DH
2230                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2231                         {
2232                         DH *dh_srvr,*dh_clnt;
2233
2234                         if (s->session->sess_cert == NULL) 
2235                                 {
2236                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2237                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2238                                 goto err;
2239                                 }
2240
2241                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2242                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2243                         else
2244                                 {
2245                                 /* we get them from the cert */
2246                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2247                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2248                                 goto err;
2249                                 }
2250                         
2251                         /* generate a new random key */
2252                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2253                                 {
2254                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2255                                 goto err;
2256                                 }
2257                         if (!DH_generate_key(dh_clnt))
2258                                 {
2259                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2260                                 goto err;
2261                                 }
2262
2263                         /* use the 'p' output buffer for the DH key, but
2264                          * make sure to clear it out afterwards */
2265
2266                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2267
2268                         if (n <= 0)
2269                                 {
2270                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2271                                 goto err;
2272                                 }
2273
2274                         /* generate master key from the result */
2275                         s->session->master_key_length=
2276                                 s->method->ssl3_enc->generate_master_secret(s,
2277                                         s->session->master_key,p,n);
2278                         /* clean up */
2279                         memset(p,0,n);
2280
2281                         /* send off the data */
2282                         n=BN_num_bytes(dh_clnt->pub_key);
2283                         s2n(n,p);
2284                         BN_bn2bin(dh_clnt->pub_key,p);
2285                         n+=2;
2286
2287                         DH_free(dh_clnt);
2288
2289                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2290                         }
2291 #endif
2292
2293 #ifndef OPENSSL_NO_ECDH 
2294                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2295                         {
2296                         const EC_GROUP *srvr_group = NULL;
2297                         EC_KEY *tkey;
2298                         int ecdh_clnt_cert = 0;
2299                         int field_size = 0;
2300
2301                         /* Did we send out the client's
2302                          * ECDH share for use in premaster
2303                          * computation as part of client certificate?
2304                          * If so, set ecdh_clnt_cert to 1.
2305                          */
2306                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
2307                                 {
2308                                 /* XXX: For now, we do not support client
2309                                  * authentication using ECDH certificates.
2310                                  * To add such support, one needs to add
2311                                  * code that checks for appropriate 
2312                                  * conditions and sets ecdh_clnt_cert to 1.
2313                                  * For example, the cert have an ECC
2314                                  * key on the same curve as the server's
2315                                  * and the key should be authorized for
2316                                  * key agreement.
2317                                  *
2318                                  * One also needs to add code in ssl3_connect
2319                                  * to skip sending the certificate verify
2320                                  * message.
2321                                  *
2322                                  * if ((s->cert->key->privatekey != NULL) &&
2323                                  *     (s->cert->key->privatekey->type ==
2324                                  *      EVP_PKEY_EC) && ...)
2325                                  * ecdh_clnt_cert = 1;
2326                                  */
2327                                 }
2328
2329                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2330                                 {
2331                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2332                                 }
2333                         else
2334                                 {
2335                                 /* Get the Server Public Key from Cert */
2336                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2337                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2338                                 if ((srvr_pub_pkey == NULL) ||
2339                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2340                                     (srvr_pub_pkey->pkey.ec == NULL))
2341                                         {
2342                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2343                                             ERR_R_INTERNAL_ERROR);
2344                                         goto err;
2345                                         }
2346
2347                                 tkey = srvr_pub_pkey->pkey.ec;
2348                                 }
2349
2350                         srvr_group   = EC_KEY_get0_group(tkey);
2351                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2352
2353                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2354                                 {
2355                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2356                                     ERR_R_INTERNAL_ERROR);
2357                                 goto err;
2358                                 }
2359
2360                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
2361                                 {
2362                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2363                                 goto err;
2364                                 }
2365
2366                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2367                                 {
2368                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2369                                 goto err;
2370                                 }
2371                         if (ecdh_clnt_cert) 
2372                                 { 
2373                                 /* Reuse key info from our certificate
2374                                  * We only need our private key to perform
2375                                  * the ECDH computation.
2376                                  */
2377                                 const BIGNUM *priv_key;
2378                                 tkey = s->cert->key->privatekey->pkey.ec;
2379                                 priv_key = EC_KEY_get0_private_key(tkey);
2380                                 if (priv_key == NULL)
2381                                         {
2382                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2383                                         goto err;
2384                                         }
2385                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2386                                         {
2387                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2388                                         goto err;
2389                                         }
2390                                 }
2391                         else 
2392                                 {
2393                                 /* Generate a new ECDH key pair */
2394                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2395                                         {
2396                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2397                                         goto err;
2398                                         }
2399                                 }
2400
2401                         /* use the 'p' output buffer for the ECDH key, but
2402                          * make sure to clear it out afterwards
2403                          */
2404
2405                         field_size = EC_GROUP_get_degree(srvr_group);
2406                         if (field_size <= 0)
2407                                 {
2408                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2409                                        ERR_R_ECDH_LIB);
2410                                 goto err;
2411                                 }
2412                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2413                         if (n <= 0)
2414                                 {
2415                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2416                                        ERR_R_ECDH_LIB);
2417                                 goto err;
2418                                 }
2419
2420                         /* generate master key from the result */
2421                         s->session->master_key_length = s->method->ssl3_enc \
2422                             -> generate_master_secret(s, 
2423                                 s->session->master_key,
2424                                 p, n);
2425
2426                         memset(p, 0, n); /* clean up */
2427
2428                         if (ecdh_clnt_cert) 
2429                                 {
2430                                 /* Send empty client key exch message */
2431                                 n = 0;
2432                                 }
2433                         else 
2434                                 {
2435                                 /* First check the size of encoding and
2436                                  * allocate memory accordingly.
2437                                  */
2438                                 encoded_pt_len = 
2439                                     EC_POINT_point2oct(srvr_group, 
2440                                         EC_KEY_get0_public_key(clnt_ecdh), 
2441                                         POINT_CONVERSION_UNCOMPRESSED, 
2442                                         NULL, 0, NULL);
2443
2444                                 encodedPoint = (unsigned char *) 
2445                                     OPENSSL_malloc(encoded_pt_len * 
2446                                         sizeof(unsigned char)); 
2447                                 bn_ctx = BN_CTX_new();
2448                                 if ((encodedPoint == NULL) || 
2449                                     (bn_ctx == NULL)) 
2450                                         {
2451                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2452                                         goto err;
2453                                         }
2454
2455                                 /* Encode the public key */
2456                                 n = EC_POINT_point2oct(srvr_group, 
2457                                     EC_KEY_get0_public_key(clnt_ecdh), 
2458                                     POINT_CONVERSION_UNCOMPRESSED, 
2459                                     encodedPoint, encoded_pt_len, bn_ctx);
2460
2461                                 *p = n; /* length of encoded point */
2462                                 /* Encoded point will be copied here */
2463                                 p += 1; 
2464                                 /* copy the point */
2465                                 memcpy((unsigned char *)p, encodedPoint, n);
2466                                 /* increment n to account for length field */
2467                                 n += 1; 
2468                                 }
2469
2470                         /* Free allocated memory */
2471                         BN_CTX_free(bn_ctx);
2472                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2473                         if (clnt_ecdh != NULL) 
2474                                  EC_KEY_free(clnt_ecdh);
2475                         EVP_PKEY_free(srvr_pub_pkey);
2476                         }
2477 #endif /* !OPENSSL_NO_ECDH */
2478                 else if (alg_k & SSL_kGOST) 
2479                         {
2480                         /* GOST key exchange message creation */
2481                         EVP_PKEY_CTX *pkey_ctx;
2482                         X509 *peer_cert; 
2483                         size_t msglen;
2484                         unsigned int md_len;
2485                         int keytype;
2486                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2487                         EVP_MD_CTX *ukm_hash;
2488                         EVP_PKEY *pub_key;
2489
2490                         /* Get server sertificate PKEY and create ctx from it */
2491                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2492                         if (!peer_cert) 
2493                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2494                         if (!peer_cert)         {
2495                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2496                                         goto err;
2497                                 }       
2498                                 
2499                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2500                         /* If we have send a certificate, and certificate key
2501
2502                          * parameters match those of server certificate, use
2503                          * certificate key for key exchange
2504                          */
2505
2506                          /* Otherwise, generate ephemeral key pair */
2507                                         
2508                         EVP_PKEY_encrypt_init(pkey_ctx);
2509                           /* Generate session key */    
2510                     RAND_bytes(premaster_secret,32);
2511                         /* If we have client certificate, use its secret as peer key */
2512                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2513                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2514                                         /* If there was an error - just ignore it. Ephemeral key
2515                                         * would be used
2516                                         */
2517                                         ERR_clear_error();
2518                                 }
2519                         }                       
2520                         /* Compute shared IV and store it in algorithm-specific
2521                          * context data */
2522                         ukm_hash = EVP_MD_CTX_create();
2523                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2524                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2525                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2526                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2527                         EVP_MD_CTX_destroy(ukm_hash);
2528                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2529                                 8,shared_ukm)<0) {
2530                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2531                                                 SSL_R_LIBRARY_BUG);
2532                                         goto err;
2533                                 }       
2534                         /* Make GOST keytransport blob message */
2535                         /*Encapsulate it into sequence */
2536                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2537                         msglen=255;
2538                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2539                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2540                                         SSL_R_LIBRARY_BUG);
2541                                 goto err;
2542                         }
2543                         if (msglen >= 0x80)
2544                                 {
2545                                 *(p++)=0x81;
2546                                 *(p++)= msglen & 0xff;
2547                                 n=msglen+3;
2548                                 }
2549                         else
2550                                 {
2551                                 *(p++)= msglen & 0xff;
2552                                 n=msglen+2;
2553                                 }
2554                         memcpy(p, tmp, msglen);
2555                         /* Check if pubkey from client certificate was used */
2556                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2557                                 {
2558                                 /* Set flag "skip certificate verify" */
2559                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2560                                 }
2561                         EVP_PKEY_CTX_free(pkey_ctx);
2562                         s->session->master_key_length=
2563                                 s->method->ssl3_enc->generate_master_secret(s,
2564                                         s->session->master_key,premaster_secret,32);
2565                         EVP_PKEY_free(pub_key);
2566
2567                         }
2568 #ifndef OPENSSL_NO_PSK
2569                 else if (alg_k & SSL_kPSK)
2570                         {
2571                         char identity[PSK_MAX_IDENTITY_LEN];
2572                         unsigned char *t = NULL;
2573                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2574                         unsigned int pre_ms_len = 0, psk_len = 0;
2575                         int psk_err = 1;
2576
2577                         n = 0;
2578                         if (s->psk_client_callback == NULL)
2579                                 {
2580                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2581                                         SSL_R_PSK_NO_CLIENT_CB);
2582                                 goto err;
2583                                 }
2584
2585                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2586                                 identity, PSK_MAX_IDENTITY_LEN,
2587                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2588                         if (psk_len > PSK_MAX_PSK_LEN)
2589                                 {
2590                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2591                                         ERR_R_INTERNAL_ERROR);
2592                                 goto psk_err;
2593                                 }
2594                         else if (psk_len == 0)
2595                                 {
2596                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2597                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2598                                 goto psk_err;
2599                                 }
2600
2601                         /* create PSK pre_master_secret */
2602                         pre_ms_len = 2+psk_len+2+psk_len;
2603                         t = psk_or_pre_ms;
2604                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2605                         s2n(psk_len, t);
2606                         memset(t, 0, psk_len);
2607                         t+=psk_len;
2608                         s2n(psk_len, t);
2609
2610                         if (s->session->psk_identity_hint != NULL)
2611                                 OPENSSL_free(s->session->psk_identity_hint);
2612                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2613                         if (s->ctx->psk_identity_hint != NULL &&
2614                                 s->session->psk_identity_hint == NULL)
2615                                 {
2616                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2617                                         ERR_R_MALLOC_FAILURE);
2618                                 goto psk_err;
2619                                 }
2620
2621                         if (s->session->psk_identity != NULL)
2622                                 OPENSSL_free(s->session->psk_identity);
2623                         s->session->psk_identity = BUF_strdup(identity);
2624                         if (s->session->psk_identity == NULL)
2625                                 {
2626                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2627                                         ERR_R_MALLOC_FAILURE);
2628                                 goto psk_err;
2629                                 }
2630
2631                         s->session->master_key_length =
2632                                 s->method->ssl3_enc->generate_master_secret(s,
2633                                         s->session->master_key,
2634                                         psk_or_pre_ms, pre_ms_len); 
2635                         n = strlen(identity);
2636                         s2n(n, p);
2637                         memcpy(p, identity, n);
2638                         n+=2;
2639                         psk_err = 0;
2640                 psk_err:
2641                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2642                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2643                         if (psk_err != 0)
2644                                 {
2645                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2646                                 goto err;
2647                                 }
2648                         }
2649 #endif
2650                 else
2651                         {
2652                         ssl3_send_alert(s, SSL3_AL_FATAL,
2653                             SSL_AD_HANDSHAKE_FAILURE);
2654                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2655                             ERR_R_INTERNAL_ERROR);
2656                         goto err;
2657                         }
2658                 
2659                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2660                 l2n3(n,d);
2661
2662                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2663                 /* number of bytes to write */
2664                 s->init_num=n+4;
2665                 s->init_off=0;
2666                 }
2667
2668         /* SSL3_ST_CW_KEY_EXCH_B */
2669         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2670 err:
2671 #ifndef OPENSSL_NO_ECDH
2672         BN_CTX_free(bn_ctx);
2673         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2674         if (clnt_ecdh != NULL) 
2675                 EC_KEY_free(clnt_ecdh);
2676         EVP_PKEY_free(srvr_pub_pkey);
2677 #endif
2678         return(-1);
2679         }
2680
2681 int ssl3_send_client_verify(SSL *s)
2682         {
2683         unsigned char *p,*d;
2684         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2685         EVP_PKEY *pkey;
2686         EVP_PKEY_CTX *pctx=NULL;
2687 #ifndef OPENSSL_NO_RSA
2688         unsigned u=0;
2689 #endif
2690         unsigned long n;
2691         int j;
2692
2693         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2694                 {
2695                 d=(unsigned char *)s->init_buf->data;
2696                 p= &(d[4]);
2697                 pkey=s->cert->key->privatekey;
2698 /* Create context from key and test if sha1 is allowed as digest */
2699                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2700                 EVP_PKEY_sign_init(pctx);
2701                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2702                         {
2703                         s->method->ssl3_enc->cert_verify_mac(s,
2704                                                 NID_sha1,
2705                                                 &(data[MD5_DIGEST_LENGTH]));
2706                         }
2707                 else
2708                         {
2709                         ERR_clear_error();
2710                         }
2711 #ifndef OPENSSL_NO_RSA
2712                 if (pkey->type == EVP_PKEY_RSA)
2713                         {
2714                         s->method->ssl3_enc->cert_verify_mac(s,
2715                                 NID_md5,
2716                                 &(data[0]));
2717                         if (RSA_sign(NID_md5_sha1, data,
2718                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2719                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2720                                 {
2721                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2722                                 goto err;
2723                                 }
2724                         s2n(u,p);
2725                         n=u+2;
2726                         }
2727                 else
2728 #endif
2729 #ifndef OPENSSL_NO_DSA
2730                         if (pkey->type == EVP_PKEY_DSA)
2731                         {
2732                         if (!DSA_sign(pkey->save_type,
2733                                 &(data[MD5_DIGEST_LENGTH]),
2734                                 SHA_DIGEST_LENGTH,&(p[2]),
2735                                 (unsigned int *)&j,pkey->pkey.dsa))
2736                                 {
2737                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2738                                 goto err;
2739                                 }
2740                         s2n(j,p);
2741                         n=j+2;
2742                         }
2743                 else
2744 #endif
2745 #ifndef OPENSSL_NO_ECDSA
2746                         if (pkey->type == EVP_PKEY_EC)
2747                         {
2748                         if (!ECDSA_sign(pkey->save_type,
2749                                 &(data[MD5_DIGEST_LENGTH]),
2750                                 SHA_DIGEST_LENGTH,&(p[2]),
2751                                 (unsigned int *)&j,pkey->pkey.ec))
2752                                 {
2753                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2754                                     ERR_R_ECDSA_LIB);
2755                                 goto err;
2756                                 }
2757                         s2n(j,p);
2758                         n=j+2;
2759                         }
2760                 else
2761 #endif
2762                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) 
2763                 {
2764                 unsigned char signbuf[64];
2765                 int i;
2766                 size_t sigsize=64;
2767                 s->method->ssl3_enc->cert_verify_mac(s,
2768                         NID_id_GostR3411_94,
2769                         data);
2770                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2771                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2772                         ERR_R_INTERNAL_ERROR);
2773                         goto err;
2774                 }
2775                 for (i=63,j=0; i>=0; j++, i--) {
2776                         p[2+j]=signbuf[i];
2777                 }       
2778                 s2n(j,p);
2779                 n=j+2;
2780                 }
2781                 else
2782                 {
2783                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2784                         goto err;
2785                 }
2786                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2787                 l2n3(n,d);
2788
2789                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2790                 s->init_num=(int)n+4;
2791                 s->init_off=0;
2792                 }
2793         EVP_PKEY_CTX_free(pctx);
2794         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2795 err:
2796         EVP_PKEY_CTX_free(pctx);
2797         return(-1);
2798         }
2799
2800 int ssl3_send_client_certificate(SSL *s)
2801         {
2802         X509 *x509=NULL;
2803         EVP_PKEY *pkey=NULL;
2804         int i;
2805         unsigned long l;
2806
2807         if (s->state == SSL3_ST_CW_CERT_A)
2808                 {
2809                 if ((s->cert == NULL) ||
2810                         (s->cert->key->x509 == NULL) ||
2811                         (s->cert->key->privatekey == NULL))
2812                         s->state=SSL3_ST_CW_CERT_B;
2813                 else
2814                         s->state=SSL3_ST_CW_CERT_C;
2815                 }
2816
2817         /* We need to get a client cert */
2818         if (s->state == SSL3_ST_CW_CERT_B)
2819                 {
2820                 /* If we get an error, we need to
2821                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2822                  * We then get retied later */
2823                 i=0;
2824                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2825                 if (i < 0)
2826                         {
2827                         s->rwstate=SSL_X509_LOOKUP;
2828                         return(-1);
2829                         }
2830                 s->rwstate=SSL_NOTHING;
2831                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2832                         {
2833                         s->state=SSL3_ST_CW_CERT_B;
2834                         if (    !SSL_use_certificate(s,x509) ||
2835                                 !SSL_use_PrivateKey(s,pkey))
2836                                 i=0;
2837                         }
2838                 else if (i == 1)
2839                         {
2840                         i=0;
2841                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2842                         }
2843
2844                 if (x509 != NULL) X509_free(x509);
2845                 if (pkey != NULL) EVP_PKEY_free(pkey);
2846                 if (i == 0)
2847                         {
2848                         if (s->version == SSL3_VERSION)
2849                                 {
2850                                 s->s3->tmp.cert_req=0;
2851                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2852                                 return(1);
2853                                 }
2854                         else
2855                                 {
2856                                 s->s3->tmp.cert_req=2;
2857                                 }
2858                         }
2859
2860                 /* Ok, we have a cert */
2861                 s->state=SSL3_ST_CW_CERT_C;
2862                 }
2863
2864         if (s->state == SSL3_ST_CW_CERT_C)
2865                 {
2866                 s->state=SSL3_ST_CW_CERT_D;
2867                 l=ssl3_output_cert_chain(s,
2868                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2869                 s->init_num=(int)l;
2870                 s->init_off=0;
2871                 }
2872         /* SSL3_ST_CW_CERT_D */
2873         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2874         }
2875
2876 #define has_bits(i,m)   (((i)&(m)) == (m))
2877
2878 int ssl3_check_cert_and_algorithm(SSL *s)
2879         {
2880         int i,idx;
2881         long alg_k,alg_a;
2882         EVP_PKEY *pkey=NULL;
2883         SESS_CERT *sc;
2884 #ifndef OPENSSL_NO_RSA
2885         RSA *rsa;
2886 #endif
2887 #ifndef OPENSSL_NO_DH
2888         DH *dh;
2889 #endif
2890
2891         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2892         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2893
2894         /* we don't have a certificate */
2895         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2896                 return(1);
2897
2898         sc=s->session->sess_cert;
2899         if (sc == NULL)
2900                 {
2901                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2902                 goto err;
2903                 }
2904
2905 #ifndef OPENSSL_NO_RSA
2906         rsa=s->session->sess_cert->peer_rsa_tmp;
2907 #endif
2908 #ifndef OPENSSL_NO_DH
2909         dh=s->session->sess_cert->peer_dh_tmp;
2910 #endif
2911
2912         /* This is the passed certificate */
2913
2914         idx=sc->peer_cert_type;
2915 #ifndef OPENSSL_NO_ECDH
2916         if (idx == SSL_PKEY_ECC)
2917                 {
2918                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2919                     s->s3->tmp.new_cipher) == 0) 
2920                         { /* check failed */
2921                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2922                         goto f_err;
2923                         }
2924                 else 
2925                         {
2926                         return 1;
2927                         }
2928                 }
2929 #endif
2930         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2931         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2932         EVP_PKEY_free(pkey);
2933
2934         
2935         /* Check that we have a certificate if we require one */
2936         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2937                 {
2938                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2939                 goto f_err;
2940                 }
2941 #ifndef OPENSSL_NO_DSA
2942         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2943                 {
2944                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2945                 goto f_err;
2946                 }
2947 #endif
2948 #ifndef OPENSSL_NO_RSA
2949         if ((alg_k & SSL_kRSA) &&
2950                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2951                 {
2952                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2953                 goto f_err;
2954                 }
2955 #endif
2956 #ifndef OPENSSL_NO_DH
2957         if ((alg_k & SSL_kEDH) &&
2958                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2959                 {
2960                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2961                 goto f_err;
2962                 }
2963         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2964                 {
2965                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2966                 goto f_err;
2967                 }
2968 #ifndef OPENSSL_NO_DSA
2969         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2970                 {
2971                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2972                 goto f_err;
2973                 }
2974 #endif
2975 #endif
2976
2977         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2978                 {
2979 #ifndef OPENSSL_NO_RSA
2980                 if (alg_k & SSL_kRSA)
2981                         {
2982                         if (rsa == NULL
2983                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2984                                 {
2985                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2986                                 goto f_err;
2987                                 }
2988                         }
2989                 else
2990 #endif
2991 #ifndef OPENSSL_NO_DH
2992                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2993                             {
2994                             if (dh == NULL
2995                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2996                                 {
2997                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2998                                 goto f_err;
2999                                 }
3000                         }
3001                 else
3002 #endif
3003                         {
3004                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3005                         goto f_err;
3006                         }
3007                 }
3008         return(1);
3009 f_err:
3010         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3011 err:
3012         return(0);
3013         }
3014
3015 /* Check to see if handshake is full or resumed. Usually this is just a
3016  * case of checking to see if a cache hit has occurred. In the case of
3017  * session tickets we have to check the next message to be sure.
3018  */
3019
3020 #ifndef OPENSSL_NO_TLSEXT
3021 # ifndef OPENSSL_NO_NPN
3022 int ssl3_send_next_proto(SSL *s)
3023         {
3024         unsigned int len, padding_len;
3025         unsigned char *d;
3026
3027         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3028                 {
3029                 len = s->next_proto_negotiated_len;
3030                 padding_len = 32 - ((len + 2) % 32);
3031                 d = (unsigned char *)s->init_buf->data;
3032                 d[4] = len;
3033                 memcpy(d + 5, s->next_proto_negotiated, len);
3034                 d[5 + len] = padding_len;
3035                 memset(d + 6 + len, 0, padding_len);
3036                 *(d++)=SSL3_MT_NEXT_PROTO;
3037                 l2n3(2 + len + padding_len, d);
3038                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3039                 s->init_num = 4 + 2 + len + padding_len;
3040                 s->init_off = 0;
3041                 }
3042
3043         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3044         }
3045 # endif
3046
3047 int ssl3_check_finished(SSL *s)
3048         {
3049         int ok;
3050         long n;
3051         /* If we have no ticket it cannot be a resumed session. */
3052         if (!s->session->tlsext_tick)
3053                 return 1;
3054         /* this function is called when we really expect a Certificate
3055          * message, so permit appropriate message length */
3056         n=s->method->ssl_get_message(s,
3057                 SSL3_ST_CR_CERT_A,
3058                 SSL3_ST_CR_CERT_B,
3059                 -1,
3060                 s->max_cert_list,
3061                 &ok);
3062         if (!ok) return((int)n);
3063         s->s3->tmp.reuse_message = 1;
3064         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3065                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3066                 return 2;
3067
3068         return 1;
3069         }
3070 #endif
3071
3072 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3073         {
3074         int i = 0;
3075 #ifndef OPENSSL_NO_ENGINE