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[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 #ifndef OPENSSL_NO_TLSEXT
170 static int ssl3_check_finished(SSL *s);
171 #endif
172
173 static const SSL_METHOD *ssl3_get_client_method(int ver)
174         {
175         if (ver == SSL3_VERSION)
176                 return(SSLv3_client_method());
177         else
178                 return(NULL);
179         }
180
181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
182                         ssl_undefined_function,
183                         ssl3_connect,
184                         ssl3_get_client_method)
185
186 int ssl3_connect(SSL *s)
187         {
188         BUF_MEM *buf=NULL;
189         unsigned long Time=(unsigned long)time(NULL);
190         long num1;
191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
192         int ret= -1;
193         int new_state,state,skip=0;
194
195         RAND_add(&Time,sizeof(Time),0);
196         ERR_clear_error();
197         clear_sys_error();
198
199         if (s->info_callback != NULL)
200                 cb=s->info_callback;
201         else if (s->ctx->info_callback != NULL)
202                 cb=s->ctx->info_callback;
203         
204         s->in_handshake++;
205         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
206
207         for (;;)
208                 {
209                 state=s->state;
210
211                 switch(s->state)
212                         {
213                 case SSL_ST_RENEGOTIATE:
214                         s->new_session=1;
215                         s->state=SSL_ST_CONNECT;
216                         s->ctx->stats.sess_connect_renegotiate++;
217                         /* break */
218                 case SSL_ST_BEFORE:
219                 case SSL_ST_CONNECT:
220                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
221                 case SSL_ST_OK|SSL_ST_CONNECT:
222
223                         s->server=0;
224                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
225
226                         if ((s->version & 0xff00 ) != 0x0300)
227                                 {
228                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
229                                 ret = -1;
230                                 goto end;
231                                 }
232                                 
233                         /* s->version=SSL3_VERSION; */
234                         s->type=SSL_ST_CONNECT;
235
236                         if (s->init_buf == NULL)
237                                 {
238                                 if ((buf=BUF_MEM_new()) == NULL)
239                                         {
240                                         ret= -1;
241                                         goto end;
242                                         }
243                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
244                                         {
245                                         ret= -1;
246                                         goto end;
247                                         }
248                                 s->init_buf=buf;
249                                 buf=NULL;
250                                 }
251
252                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
253
254                         /* setup buffing BIO */
255                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
256
257                         /* don't push the buffering BIO quite yet */
258
259                         ssl3_init_finished_mac(s);
260
261                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
262                         s->ctx->stats.sess_connect++;
263                         s->init_num=0;
264                         break;
265
266                 case SSL3_ST_CW_CLNT_HELLO_A:
267                 case SSL3_ST_CW_CLNT_HELLO_B:
268
269                         s->shutdown=0;
270                         ret=ssl3_client_hello(s);
271                         if (ret <= 0) goto end;
272                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
273                         s->init_num=0;
274
275                         /* turn on buffering for the next lot of output */
276                         if (s->bbio != s->wbio)
277                                 s->wbio=BIO_push(s->bbio,s->wbio);
278
279                         break;
280
281                 case SSL3_ST_CR_SRVR_HELLO_A:
282                 case SSL3_ST_CR_SRVR_HELLO_B:
283                         ret=ssl3_get_server_hello(s);
284                         if (ret <= 0) goto end;
285
286                         if (s->hit)
287                                 s->state=SSL3_ST_CR_FINISHED_A;
288                         else
289                                 s->state=SSL3_ST_CR_CERT_A;
290                         s->init_num=0;
291                         break;
292
293                 case SSL3_ST_CR_CERT_A:
294                 case SSL3_ST_CR_CERT_B:
295 #ifndef OPENSSL_NO_TLSEXT
296                         ret=ssl3_check_finished(s);
297                         if (ret <= 0) goto end;
298                         if (ret == 2)
299                                 {
300                                 s->hit = 1;
301                                 if (s->tlsext_ticket_expected)
302                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
303                                 else
304                                         s->state=SSL3_ST_CR_FINISHED_A;
305                                 s->init_num=0;
306                                 break;
307                                 }
308 #endif
309                         /* Check if it is anon DH/ECDH */
310                         /* or PSK */
311                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
312                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
313                                 {
314                                 ret=ssl3_get_server_certificate(s);
315                                 if (ret <= 0) goto end;
316 #ifndef OPENSSL_NO_TLSEXT
317                                 if (s->tlsext_status_expected)
318                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
319                                 else
320                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
321                                 }
322                         else
323                                 {
324                                 skip = 1;
325                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
326                                 }
327 #else
328                                 }
329                         else
330                                 skip=1;
331
332                         s->state=SSL3_ST_CR_KEY_EXCH_A;
333 #endif
334                         s->init_num=0;
335                         break;
336
337                 case SSL3_ST_CR_KEY_EXCH_A:
338                 case SSL3_ST_CR_KEY_EXCH_B:
339                         ret=ssl3_get_key_exchange(s);
340                         if (ret <= 0) goto end;
341                         s->state=SSL3_ST_CR_CERT_REQ_A;
342                         s->init_num=0;
343
344                         /* at this point we check that we have the
345                          * required stuff from the server */
346                         if (!ssl3_check_cert_and_algorithm(s))
347                                 {
348                                 ret= -1;
349                                 goto end;
350                                 }
351                         break;
352
353                 case SSL3_ST_CR_CERT_REQ_A:
354                 case SSL3_ST_CR_CERT_REQ_B:
355                         ret=ssl3_get_certificate_request(s);
356                         if (ret <= 0) goto end;
357                         s->state=SSL3_ST_CR_SRVR_DONE_A;
358                         s->init_num=0;
359                         break;
360
361                 case SSL3_ST_CR_SRVR_DONE_A:
362                 case SSL3_ST_CR_SRVR_DONE_B:
363                         ret=ssl3_get_server_done(s);
364                         if (ret <= 0) goto end;
365                         if (s->s3->tmp.cert_req)
366                                 s->state=SSL3_ST_CW_CERT_A;
367                         else
368                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
369                         s->init_num=0;
370
371                         break;
372
373                 case SSL3_ST_CW_CERT_A:
374                 case SSL3_ST_CW_CERT_B:
375                 case SSL3_ST_CW_CERT_C:
376                 case SSL3_ST_CW_CERT_D:
377                         ret=ssl3_send_client_certificate(s);
378                         if (ret <= 0) goto end;
379                         s->state=SSL3_ST_CW_KEY_EXCH_A;
380                         s->init_num=0;
381                         break;
382
383                 case SSL3_ST_CW_KEY_EXCH_A:
384                 case SSL3_ST_CW_KEY_EXCH_B:
385                         ret=ssl3_send_client_key_exchange(s);
386                         if (ret <= 0) goto end;
387                         /* EAY EAY EAY need to check for DH fix cert
388                          * sent back */
389                         /* For TLS, cert_req is set to 2, so a cert chain
390                          * of nothing is sent, but no verify packet is sent */
391                         /* XXX: For now, we do not support client 
392                          * authentication in ECDH cipher suites with
393                          * ECDH (rather than ECDSA) certificates.
394                          * We need to skip the certificate verify 
395                          * message when client's ECDH public key is sent 
396                          * inside the client certificate.
397                          */
398                         if (s->s3->tmp.cert_req == 1)
399                                 {
400                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
401                                 }
402                         else
403                                 {
404                                 s->state=SSL3_ST_CW_CHANGE_A;
405                                 s->s3->change_cipher_spec=0;
406                                 }
407
408                         s->init_num=0;
409                         break;
410
411                 case SSL3_ST_CW_CERT_VRFY_A:
412                 case SSL3_ST_CW_CERT_VRFY_B:
413                         ret=ssl3_send_client_verify(s);
414                         if (ret <= 0) goto end;
415                         s->state=SSL3_ST_CW_CHANGE_A;
416                         s->init_num=0;
417                         s->s3->change_cipher_spec=0;
418                         break;
419
420                 case SSL3_ST_CW_CHANGE_A:
421                 case SSL3_ST_CW_CHANGE_B:
422                         ret=ssl3_send_change_cipher_spec(s,
423                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
424                         if (ret <= 0) goto end;
425                         s->state=SSL3_ST_CW_FINISHED_A;
426                         s->init_num=0;
427
428                         s->session->cipher=s->s3->tmp.new_cipher;
429 #ifdef OPENSSL_NO_COMP
430                         s->session->compress_meth=0;
431 #else
432                         if (s->s3->tmp.new_compression == NULL)
433                                 s->session->compress_meth=0;
434                         else
435                                 s->session->compress_meth=
436                                         s->s3->tmp.new_compression->id;
437 #endif
438                         if (!s->method->ssl3_enc->setup_key_block(s))
439                                 {
440                                 ret= -1;
441                                 goto end;
442                                 }
443
444                         if (!s->method->ssl3_enc->change_cipher_state(s,
445                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
446                                 {
447                                 ret= -1;
448                                 goto end;
449                                 }
450
451                         break;
452
453                 case SSL3_ST_CW_FINISHED_A:
454                 case SSL3_ST_CW_FINISHED_B:
455                         ret=ssl3_send_finished(s,
456                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
457                                 s->method->ssl3_enc->client_finished_label,
458                                 s->method->ssl3_enc->client_finished_label_len);
459                         if (ret <= 0) goto end;
460                         s->state=SSL3_ST_CW_FLUSH;
461
462                         /* clear flags */
463                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
464                         if (s->hit)
465                                 {
466                                 s->s3->tmp.next_state=SSL_ST_OK;
467                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
468                                         {
469                                         s->state=SSL_ST_OK;
470                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
471                                         s->s3->delay_buf_pop_ret=0;
472                                         }
473                                 }
474                         else
475                                 {
476 #ifndef OPENSSL_NO_TLSEXT
477                                 /* Allow NewSessionTicket if ticket expected */
478                                 if (s->tlsext_ticket_expected)
479                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
480                                 else
481 #endif
482                                 
483                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
484                                 }
485                         s->init_num=0;
486                         break;
487
488 #ifndef OPENSSL_NO_TLSEXT
489                 case SSL3_ST_CR_SESSION_TICKET_A:
490                 case SSL3_ST_CR_SESSION_TICKET_B:
491                         ret=ssl3_get_new_session_ticket(s);
492                         if (ret <= 0) goto end;
493                         s->state=SSL3_ST_CR_FINISHED_A;
494                         s->init_num=0;
495                 break;
496
497                 case SSL3_ST_CR_CERT_STATUS_A:
498                 case SSL3_ST_CR_CERT_STATUS_B:
499                         ret=ssl3_get_cert_status(s);
500                         if (ret <= 0) goto end;
501                         s->state=SSL3_ST_CR_KEY_EXCH_A;
502                         s->init_num=0;
503                 break;
504 #endif
505
506                 case SSL3_ST_CR_FINISHED_A:
507                 case SSL3_ST_CR_FINISHED_B:
508
509                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
510                                 SSL3_ST_CR_FINISHED_B);
511                         if (ret <= 0) goto end;
512
513                         if (s->hit)
514                                 s->state=SSL3_ST_CW_CHANGE_A;
515                         else
516                                 s->state=SSL_ST_OK;
517                         s->init_num=0;
518                         break;
519
520                 case SSL3_ST_CW_FLUSH:
521                         /* number of bytes to be flushed */
522                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
523                         if (num1 > 0)
524                                 {
525                                 s->rwstate=SSL_WRITING;
526                                 num1=BIO_flush(s->wbio);
527                                 if (num1 <= 0) { ret= -1; goto end; }
528                                 s->rwstate=SSL_NOTHING;
529                                 }
530
531                         s->state=s->s3->tmp.next_state;
532                         break;
533
534                 case SSL_ST_OK:
535                         /* clean a few things up */
536                         ssl3_cleanup_key_block(s);
537
538                         if (s->init_buf != NULL)
539                                 {
540                                 BUF_MEM_free(s->init_buf);
541                                 s->init_buf=NULL;
542                                 }
543
544                         /* If we are not 'joining' the last two packets,
545                          * remove the buffering now */
546                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
547                                 ssl_free_wbio_buffer(s);
548                         /* else do it later in ssl3_write */
549
550                         s->init_num=0;
551                         s->new_session=0;
552
553                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
554                         if (s->hit) s->ctx->stats.sess_hit++;
555
556                         ret=1;
557                         /* s->server=0; */
558                         s->handshake_func=ssl3_connect;
559                         s->ctx->stats.sess_connect_good++;
560
561                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
562
563                         goto end;
564                         /* break; */
565                         
566                 default:
567                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
568                         ret= -1;
569                         goto end;
570                         /* break; */
571                         }
572
573                 /* did we do anything */
574                 if (!s->s3->tmp.reuse_message && !skip)
575                         {
576                         if (s->debug)
577                                 {
578                                 if ((ret=BIO_flush(s->wbio)) <= 0)
579                                         goto end;
580                                 }
581
582                         if ((cb != NULL) && (s->state != state))
583                                 {
584                                 new_state=s->state;
585                                 s->state=state;
586                                 cb(s,SSL_CB_CONNECT_LOOP,1);
587                                 s->state=new_state;
588                                 }
589                         }
590                 skip=0;
591                 }
592 end:
593         s->in_handshake--;
594         if (buf != NULL)
595                 BUF_MEM_free(buf);
596         if (cb != NULL)
597                 cb(s,SSL_CB_CONNECT_EXIT,ret);
598         return(ret);
599         }
600
601
602 int ssl3_client_hello(SSL *s)
603         {
604         unsigned char *buf;
605         unsigned char *p,*d;
606         int i;
607         unsigned long Time,l;
608 #ifndef OPENSSL_NO_COMP
609         int j;
610         SSL_COMP *comp;
611 #endif
612
613         buf=(unsigned char *)s->init_buf->data;
614         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
615                 {
616                 if ((s->session == NULL) ||
617                         (s->session->ssl_version != s->version) ||
618                         (s->session->not_resumable))
619                         {
620                         if (!ssl_get_new_session(s,0))
621                                 goto err;
622                         }
623                 /* else use the pre-loaded session */
624
625                 p=s->s3->client_random;
626                 Time=(unsigned long)time(NULL);                 /* Time */
627                 l2n(Time,p);
628                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
629                         goto err;
630
631                 /* Do the message type and length last */
632                 d=p= &(buf[4]);
633
634                 *(p++)=s->version>>8;
635                 *(p++)=s->version&0xff;
636                 s->client_version=s->version;
637
638                 /* Random stuff */
639                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
640                 p+=SSL3_RANDOM_SIZE;
641
642                 /* Session ID */
643                 if (s->new_session)
644                         i=0;
645                 else
646                         i=s->session->session_id_length;
647                 *(p++)=i;
648                 if (i != 0)
649                         {
650                         if (i > (int)sizeof(s->session->session_id))
651                                 {
652                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
653                                 goto err;
654                                 }
655                         memcpy(p,s->session->session_id,i);
656                         p+=i;
657                         }
658                 
659                 /* Ciphers supported */
660                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
661                 if (i == 0)
662                         {
663                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
664                         goto err;
665                         }
666                 s2n(i,p);
667                 p+=i;
668
669                 /* COMPRESSION */
670 #ifdef OPENSSL_NO_COMP
671                 *(p++)=1;
672 #else
673
674                 if ((s->options & SSL_OP_NO_COMPRESSION)
675                                         || !s->ctx->comp_methods)
676                         j=0;
677                 else
678                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
679                 *(p++)=1+j;
680                 for (i=0; i<j; i++)
681                         {
682                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
683                         *(p++)=comp->id;
684                         }
685 #endif
686                 *(p++)=0; /* Add the NULL method */
687
688 #ifndef OPENSSL_NO_TLSEXT
689                 /* TLS extensions*/
690                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
691                         {
692                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
693                         goto err;
694                         }
695                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
696                         {
697                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
698                         goto err;
699                         }
700 #endif
701                 
702                 l=(p-d);
703                 d=buf;
704                 *(d++)=SSL3_MT_CLIENT_HELLO;
705                 l2n3(l,d);
706
707                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
708                 /* number of bytes to write */
709                 s->init_num=p-buf;
710                 s->init_off=0;
711                 }
712
713         /* SSL3_ST_CW_CLNT_HELLO_B */
714         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
715 err:
716         return(-1);
717         }
718
719 int ssl3_get_server_hello(SSL *s)
720         {
721         STACK_OF(SSL_CIPHER) *sk;
722         const SSL_CIPHER *c;
723         unsigned char *p,*d;
724         int i,al,ok;
725         unsigned int j;
726         long n;
727 #ifndef OPENSSL_NO_COMP
728         SSL_COMP *comp;
729 #endif
730
731         n=s->method->ssl_get_message(s,
732                 SSL3_ST_CR_SRVR_HELLO_A,
733                 SSL3_ST_CR_SRVR_HELLO_B,
734                 -1,
735                 20000, /* ?? */
736                 &ok);
737
738         if (!ok) return((int)n);
739
740         if ( SSL_version(s) == DTLS1_VERSION)
741                 {
742                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
743                         {
744                         if ( s->d1->send_cookie == 0)
745                                 {
746                                 s->s3->tmp.reuse_message = 1;
747                                 return 1;
748                                 }
749                         else /* already sent a cookie */
750                                 {
751                                 al=SSL_AD_UNEXPECTED_MESSAGE;
752                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
753                                 goto f_err;
754                                 }
755                         }
756                 }
757         
758         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
759                 {
760                 al=SSL_AD_UNEXPECTED_MESSAGE;
761                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
762                 goto f_err;
763                 }
764
765         d=p=(unsigned char *)s->init_msg;
766
767         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
768                 {
769                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
770                 s->version=(s->version&0xff00)|p[1];
771                 al=SSL_AD_PROTOCOL_VERSION;
772                 goto f_err;
773                 }
774         p+=2;
775
776         /* load the server hello data */
777         /* load the server random */
778         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
779         p+=SSL3_RANDOM_SIZE;
780
781         /* get the session-id */
782         j= *(p++);
783
784         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
785                 {
786                 al=SSL_AD_ILLEGAL_PARAMETER;
787                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
788                 goto f_err;
789                 }
790
791 #ifndef OPENSSL_NO_TLSEXT
792         /* check if we want to resume the session based on external pre-shared secret */
793         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
794                 {
795                 SSL_CIPHER *pref_cipher=NULL;
796                 s->session->master_key_length=sizeof(s->session->master_key);
797                 if (s->tls_session_secret_cb(s, s->session->master_key,
798                                              &s->session->master_key_length,
799                                              NULL, &pref_cipher,
800                                              s->tls_session_secret_cb_arg))
801                         {
802                         s->session->cipher = pref_cipher ?
803                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
804                         }
805                 }
806 #endif /* OPENSSL_NO_TLSEXT */
807
808         if (j != 0 && j == s->session->session_id_length
809             && memcmp(p,s->session->session_id,j) == 0)
810             {
811             if(s->sid_ctx_length != s->session->sid_ctx_length
812                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
813                 {
814                 /* actually a client application bug */
815                 al=SSL_AD_ILLEGAL_PARAMETER;
816                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
817                 goto f_err;
818                 }
819             s->hit=1;
820             }
821         else    /* a miss or crap from the other end */
822                 {
823                 /* If we were trying for session-id reuse, make a new
824                  * SSL_SESSION so we don't stuff up other people */
825                 s->hit=0;
826                 if (s->session->session_id_length > 0)
827                         {
828                         if (!ssl_get_new_session(s,0))
829                                 {
830                                 al=SSL_AD_INTERNAL_ERROR;
831                                 goto f_err;
832                                 }
833                         }
834                 s->session->session_id_length=j;
835                 memcpy(s->session->session_id,p,j); /* j could be 0 */
836                 }
837         p+=j;
838         c=ssl_get_cipher_by_char(s,p);
839         if (c == NULL)
840                 {
841                 /* unknown cipher */
842                 al=SSL_AD_ILLEGAL_PARAMETER;
843                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
844                 goto f_err;
845                 }
846         p+=ssl_put_cipher_by_char(s,NULL,NULL);
847
848         sk=ssl_get_ciphers_by_id(s);
849         i=sk_SSL_CIPHER_find(sk,c);
850         if (i < 0)
851                 {
852                 /* we did not say we would use this cipher */
853                 al=SSL_AD_ILLEGAL_PARAMETER;
854                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
855                 goto f_err;
856                 }
857
858         /* Depending on the session caching (internal/external), the cipher
859            and/or cipher_id values may not be set. Make sure that
860            cipher_id is set and use it for comparison. */
861         if (s->session->cipher)
862                 s->session->cipher_id = s->session->cipher->id;
863         if (s->hit && (s->session->cipher_id != c->id))
864                 {
865                 if (!(s->options &
866                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
867                         {
868                         al=SSL_AD_ILLEGAL_PARAMETER;
869                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
870                         goto f_err;
871                         }
872                 }
873         s->s3->tmp.new_cipher=c;
874         if (!ssl3_digest_cached_records(s))
875                 goto f_err;
876
877         /* lets get the compression algorithm */
878         /* COMPRESSION */
879 #ifdef OPENSSL_NO_COMP
880         if (*(p++) != 0)
881                 {
882                 al=SSL_AD_ILLEGAL_PARAMETER;
883                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
884                 goto f_err;
885                 }
886 #else
887         j= *(p++);
888         if ((j == 0) || (s->options & SSL_OP_NO_COMPRESSION))
889                 comp=NULL;
890         else
891                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
892         
893         if ((j != 0) && (comp == NULL))
894                 {
895                 al=SSL_AD_ILLEGAL_PARAMETER;
896                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
897                 goto f_err;
898                 }
899         else
900                 {
901                 s->s3->tmp.new_compression=comp;
902                 }
903 #endif
904
905 #ifndef OPENSSL_NO_TLSEXT
906         /* TLS extensions*/
907         if (s->version > SSL3_VERSION)
908                 {
909                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
910                         {
911                         /* 'al' set by ssl_parse_serverhello_tlsext */
912                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
913                         goto f_err; 
914                         }
915                 if (ssl_check_serverhello_tlsext(s) <= 0)
916                         {
917                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
918                                 goto err;
919                         }
920                 }
921 #endif
922
923         if (p != (d+n))
924                 {
925                 /* wrong packet length */
926                 al=SSL_AD_DECODE_ERROR;
927                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
928                 goto err;
929                 }
930
931         return(1);
932 f_err:
933         ssl3_send_alert(s,SSL3_AL_FATAL,al);
934 err:
935         return(-1);
936         }
937
938 int ssl3_get_server_certificate(SSL *s)
939         {
940         int al,i,ok,ret= -1;
941         unsigned long n,nc,llen,l;
942         X509 *x=NULL;
943         const unsigned char *q,*p;
944         unsigned char *d;
945         STACK_OF(X509) *sk=NULL;
946         SESS_CERT *sc;
947         EVP_PKEY *pkey=NULL;
948         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
949
950         n=s->method->ssl_get_message(s,
951                 SSL3_ST_CR_CERT_A,
952                 SSL3_ST_CR_CERT_B,
953                 -1,
954                 s->max_cert_list,
955                 &ok);
956
957         if (!ok) return((int)n);
958
959         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
960                 {
961                 s->s3->tmp.reuse_message=1;
962                 return(1);
963                 }
964
965         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
966                 {
967                 al=SSL_AD_UNEXPECTED_MESSAGE;
968                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
969                 goto f_err;
970                 }
971         p=d=(unsigned char *)s->init_msg;
972
973         if ((sk=sk_X509_new_null()) == NULL)
974                 {
975                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
976                 goto err;
977                 }
978
979         n2l3(p,llen);
980         if (llen+3 != n)
981                 {
982                 al=SSL_AD_DECODE_ERROR;
983                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
984                 goto f_err;
985                 }
986         for (nc=0; nc<llen; )
987                 {
988                 n2l3(p,l);
989                 if ((l+nc+3) > llen)
990                         {
991                         al=SSL_AD_DECODE_ERROR;
992                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
993                         goto f_err;
994                         }
995
996                 q=p;
997                 x=d2i_X509(NULL,&q,l);
998                 if (x == NULL)
999                         {
1000                         al=SSL_AD_BAD_CERTIFICATE;
1001                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1002                         goto f_err;
1003                         }
1004                 if (q != (p+l))
1005                         {
1006                         al=SSL_AD_DECODE_ERROR;
1007                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1008                         goto f_err;
1009                         }
1010                 if (!sk_X509_push(sk,x))
1011                         {
1012                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1013                         goto err;
1014                         }
1015                 x=NULL;
1016                 nc+=l+3;
1017                 p=q;
1018                 }
1019
1020         i=ssl_verify_cert_chain(s,sk);
1021         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1022 #ifndef OPENSSL_NO_KRB5
1023             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1024                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1025 #endif /* OPENSSL_NO_KRB5 */
1026                 )
1027                 {
1028                 al=ssl_verify_alarm_type(s->verify_result);
1029                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1030                 goto f_err; 
1031                 }
1032         ERR_clear_error(); /* but we keep s->verify_result */
1033
1034         sc=ssl_sess_cert_new();
1035         if (sc == NULL) goto err;
1036
1037         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1038         s->session->sess_cert=sc;
1039
1040         sc->cert_chain=sk;
1041         /* Inconsistency alert: cert_chain does include the peer's
1042          * certificate, which we don't include in s3_srvr.c */
1043         x=sk_X509_value(sk,0);
1044         sk=NULL;
1045         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1046
1047         pkey=X509_get_pubkey(x);
1048
1049         /* VRS: allow null cert if auth == KRB5 */
1050         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1051                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1052                     ? 0 : 1;
1053
1054 #ifdef KSSL_DEBUG
1055         printf("pkey,x = %p, %p\n", pkey,x);
1056         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1057         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1058                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1059 #endif    /* KSSL_DEBUG */
1060
1061         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1062                 {
1063                 x=NULL;
1064                 al=SSL3_AL_FATAL;
1065                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1066                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1067                 goto f_err;
1068                 }
1069
1070         i=ssl_cert_type(x,pkey);
1071         if (need_cert && i < 0)
1072                 {
1073                 x=NULL;
1074                 al=SSL3_AL_FATAL;
1075                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1076                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1077                 goto f_err;
1078                 }
1079
1080         if (need_cert)
1081                 {
1082                 sc->peer_cert_type=i;
1083                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1084                 /* Why would the following ever happen?
1085                  * We just created sc a couple of lines ago. */
1086                 if (sc->peer_pkeys[i].x509 != NULL)
1087                         X509_free(sc->peer_pkeys[i].x509);
1088                 sc->peer_pkeys[i].x509=x;
1089                 sc->peer_key= &(sc->peer_pkeys[i]);
1090
1091                 if (s->session->peer != NULL)
1092                         X509_free(s->session->peer);
1093                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1094                 s->session->peer=x;
1095                 }
1096         else
1097                 {
1098                 sc->peer_cert_type=i;
1099                 sc->peer_key= NULL;
1100
1101                 if (s->session->peer != NULL)
1102                         X509_free(s->session->peer);
1103                 s->session->peer=NULL;
1104                 }
1105         s->session->verify_result = s->verify_result;
1106
1107         x=NULL;
1108         ret=1;
1109
1110         if (0)
1111                 {
1112 f_err:
1113                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1114                 }
1115 err:
1116         EVP_PKEY_free(pkey);
1117         X509_free(x);
1118         sk_X509_pop_free(sk,X509_free);
1119         return(ret);
1120         }
1121
1122 int ssl3_get_key_exchange(SSL *s)
1123         {
1124 #ifndef OPENSSL_NO_RSA
1125         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1126 #endif
1127         EVP_MD_CTX md_ctx;
1128         unsigned char *param,*p;
1129         int al,i,j,param_len,ok;
1130         long n,alg_k,alg_a;
1131         EVP_PKEY *pkey=NULL;
1132 #ifndef OPENSSL_NO_RSA
1133         RSA *rsa=NULL;
1134 #endif
1135 #ifndef OPENSSL_NO_DH
1136         DH *dh=NULL;
1137 #endif
1138 #ifndef OPENSSL_NO_ECDH
1139         EC_KEY *ecdh = NULL;
1140         BN_CTX *bn_ctx = NULL;
1141         EC_POINT *srvr_ecpoint = NULL;
1142         int curve_nid = 0;
1143         int encoded_pt_len = 0;
1144 #endif
1145
1146         /* use same message size as in ssl3_get_certificate_request()
1147          * as ServerKeyExchange message may be skipped */
1148         n=s->method->ssl_get_message(s,
1149                 SSL3_ST_CR_KEY_EXCH_A,
1150                 SSL3_ST_CR_KEY_EXCH_B,
1151                 -1,
1152                 s->max_cert_list,
1153                 &ok);
1154         if (!ok) return((int)n);
1155
1156         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1157                 {
1158 #ifndef OPENSSL_NO_PSK
1159                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1160                    omitted if no identity hint is sent. Set
1161                    session->sess_cert anyway to avoid problems
1162                    later.*/
1163                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1164                         {
1165                         s->session->sess_cert=ssl_sess_cert_new();
1166                         if (s->ctx->psk_identity_hint)
1167                                 OPENSSL_free(s->ctx->psk_identity_hint);
1168                         s->ctx->psk_identity_hint = NULL;
1169                         }
1170 #endif
1171                 s->s3->tmp.reuse_message=1;
1172                 return(1);
1173                 }
1174
1175         param=p=(unsigned char *)s->init_msg;
1176         if (s->session->sess_cert != NULL)
1177                 {
1178 #ifndef OPENSSL_NO_RSA
1179                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1180                         {
1181                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1182                         s->session->sess_cert->peer_rsa_tmp=NULL;
1183                         }
1184 #endif
1185 #ifndef OPENSSL_NO_DH
1186                 if (s->session->sess_cert->peer_dh_tmp)
1187                         {
1188                         DH_free(s->session->sess_cert->peer_dh_tmp);
1189                         s->session->sess_cert->peer_dh_tmp=NULL;
1190                         }
1191 #endif
1192 #ifndef OPENSSL_NO_ECDH
1193                 if (s->session->sess_cert->peer_ecdh_tmp)
1194                         {
1195                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1196                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1197                         }
1198 #endif
1199                 }
1200         else
1201                 {
1202                 s->session->sess_cert=ssl_sess_cert_new();
1203                 }
1204
1205         param_len=0;
1206         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1207         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1208         EVP_MD_CTX_init(&md_ctx);
1209
1210 #ifndef OPENSSL_NO_PSK
1211         if (alg_k & SSL_kPSK)
1212                 {
1213                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1214
1215                 al=SSL_AD_HANDSHAKE_FAILURE;
1216                 n2s(p,i);
1217                 param_len=i+2;
1218                 /* Store PSK identity hint for later use, hint is used
1219                  * in ssl3_send_client_key_exchange.  Assume that the
1220                  * maximum length of a PSK identity hint can be as
1221                  * long as the maximum length of a PSK identity. */
1222                 if (i > PSK_MAX_IDENTITY_LEN)
1223                         {
1224                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1225                                 SSL_R_DATA_LENGTH_TOO_LONG);
1226                         goto f_err;
1227                         }
1228                 if (param_len > n)
1229                         {
1230                         al=SSL_AD_DECODE_ERROR;
1231                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1232                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1233                         goto f_err;
1234                         }
1235                 /* If received PSK identity hint contains NULL
1236                  * characters, the hint is truncated from the first
1237                  * NULL. p may not be ending with NULL, so create a
1238                  * NULL-terminated string. */
1239                 memcpy(tmp_id_hint, p, i);
1240                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1241                 if (s->ctx->psk_identity_hint != NULL)
1242                         OPENSSL_free(s->ctx->psk_identity_hint);
1243                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1244                 if (s->ctx->psk_identity_hint == NULL)
1245                         {
1246                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1247                         goto f_err;
1248                         }          
1249
1250                 p+=i;
1251                 n-=param_len;
1252                 }
1253         else
1254 #endif /* !OPENSSL_NO_PSK */
1255 #ifndef OPENSSL_NO_RSA
1256         if (alg_k & SSL_kRSA)
1257                 {
1258                 if ((rsa=RSA_new()) == NULL)
1259                         {
1260                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1261                         goto err;
1262                         }
1263                 n2s(p,i);
1264                 param_len=i+2;
1265                 if (param_len > n)
1266                         {
1267                         al=SSL_AD_DECODE_ERROR;
1268                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1269                         goto f_err;
1270                         }
1271                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1272                         {
1273                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1274                         goto err;
1275                         }
1276                 p+=i;
1277
1278                 n2s(p,i);
1279                 param_len+=i+2;
1280                 if (param_len > n)
1281                         {
1282                         al=SSL_AD_DECODE_ERROR;
1283                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1284                         goto f_err;
1285                         }
1286                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1287                         {
1288                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1289                         goto err;
1290                         }
1291                 p+=i;
1292                 n-=param_len;
1293
1294                 /* this should be because we are using an export cipher */
1295                 if (alg_a & SSL_aRSA)
1296                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1297                 else
1298                         {
1299                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1300                         goto err;
1301                         }
1302                 s->session->sess_cert->peer_rsa_tmp=rsa;
1303                 rsa=NULL;
1304                 }
1305 #else /* OPENSSL_NO_RSA */
1306         if (0)
1307                 ;
1308 #endif
1309 #ifndef OPENSSL_NO_DH
1310         else if (alg_k & SSL_kEDH)
1311                 {
1312                 if ((dh=DH_new()) == NULL)
1313                         {
1314                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1315                         goto err;
1316                         }
1317                 n2s(p,i);
1318                 param_len=i+2;
1319                 if (param_len > n)
1320                         {
1321                         al=SSL_AD_DECODE_ERROR;
1322                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1323                         goto f_err;
1324                         }
1325                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1326                         {
1327                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1328                         goto err;
1329                         }
1330                 p+=i;
1331
1332                 n2s(p,i);
1333                 param_len+=i+2;
1334                 if (param_len > n)
1335                         {
1336                         al=SSL_AD_DECODE_ERROR;
1337                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1338                         goto f_err;
1339                         }
1340                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1341                         {
1342                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1343                         goto err;
1344                         }
1345                 p+=i;
1346
1347                 n2s(p,i);
1348                 param_len+=i+2;
1349                 if (param_len > n)
1350                         {
1351                         al=SSL_AD_DECODE_ERROR;
1352                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1353                         goto f_err;
1354                         }
1355                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1356                         {
1357                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1358                         goto err;
1359                         }
1360                 p+=i;
1361                 n-=param_len;
1362
1363 #ifndef OPENSSL_NO_RSA
1364                 if (alg_a & SSL_aRSA)
1365                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1366 #else
1367                 if (0)
1368                         ;
1369 #endif
1370 #ifndef OPENSSL_NO_DSA
1371                 else if (alg_a & SSL_aDSS)
1372                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1373 #endif
1374                 /* else anonymous DH, so no certificate or pkey. */
1375
1376                 s->session->sess_cert->peer_dh_tmp=dh;
1377                 dh=NULL;
1378                 }
1379         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1380                 {
1381                 al=SSL_AD_ILLEGAL_PARAMETER;
1382                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1383                 goto f_err;
1384                 }
1385 #endif /* !OPENSSL_NO_DH */
1386
1387 #ifndef OPENSSL_NO_ECDH
1388         else if (alg_k & SSL_kEECDH)
1389                 {
1390                 EC_GROUP *ngroup;
1391                 const EC_GROUP *group;
1392
1393                 if ((ecdh=EC_KEY_new()) == NULL)
1394                         {
1395                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1396                         goto err;
1397                         }
1398
1399                 /* Extract elliptic curve parameters and the
1400                  * server's ephemeral ECDH public key.
1401                  * Keep accumulating lengths of various components in
1402                  * param_len and make sure it never exceeds n.
1403                  */
1404
1405                 /* XXX: For now we only support named (not generic) curves
1406                  * and the ECParameters in this case is just three bytes.
1407                  */
1408                 param_len=3;
1409                 if ((param_len > n) ||
1410                     (*p != NAMED_CURVE_TYPE) || 
1411                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)) 
1412                         {
1413                         al=SSL_AD_INTERNAL_ERROR;
1414                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1415                         goto f_err;
1416                         }
1417
1418                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1419                 if (ngroup == NULL)
1420                         {
1421                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1422                         goto err;
1423                         }
1424                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1425                         {
1426                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1427                         goto err;
1428                         }
1429                 EC_GROUP_free(ngroup);
1430
1431                 group = EC_KEY_get0_group(ecdh);
1432
1433                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1434                     (EC_GROUP_get_degree(group) > 163))
1435                         {
1436                         al=SSL_AD_EXPORT_RESTRICTION;
1437                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1438                         goto f_err;
1439                         }
1440
1441                 p+=3;
1442
1443                 /* Next, get the encoded ECPoint */
1444                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1445                     ((bn_ctx = BN_CTX_new()) == NULL))
1446                         {
1447                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1448                         goto err;
1449                         }
1450
1451                 encoded_pt_len = *p;  /* length of encoded point */
1452                 p+=1;
1453                 param_len += (1 + encoded_pt_len);
1454                 if ((param_len > n) ||
1455                     (EC_POINT_oct2point(group, srvr_ecpoint, 
1456                         p, encoded_pt_len, bn_ctx) == 0))
1457                         {
1458                         al=SSL_AD_DECODE_ERROR;
1459                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1460                         goto f_err;
1461                         }
1462
1463                 n-=param_len;
1464                 p+=encoded_pt_len;
1465
1466                 /* The ECC/TLS specification does not mention
1467                  * the use of DSA to sign ECParameters in the server
1468                  * key exchange message. We do support RSA and ECDSA.
1469                  */
1470                 if (0) ;
1471 #ifndef OPENSSL_NO_RSA
1472                 else if (alg_a & SSL_aRSA)
1473                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1474 #endif
1475 #ifndef OPENSSL_NO_ECDSA
1476                 else if (alg_a & SSL_aECDSA)
1477                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1478 #endif
1479                 /* else anonymous ECDH, so no certificate or pkey. */
1480                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1481                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1482                 ecdh=NULL;
1483                 BN_CTX_free(bn_ctx);
1484                 EC_POINT_free(srvr_ecpoint);
1485                 srvr_ecpoint = NULL;
1486                 }
1487         else if (alg_k)
1488                 {
1489                 al=SSL_AD_UNEXPECTED_MESSAGE;
1490                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1491                 goto f_err;
1492                 }
1493 #endif /* !OPENSSL_NO_ECDH */
1494
1495
1496         /* p points to the next byte, there are 'n' bytes left */
1497
1498         /* if it was signed, check the signature */
1499         if (pkey != NULL)
1500                 {
1501                 n2s(p,i);
1502                 n-=2;
1503                 j=EVP_PKEY_size(pkey);
1504
1505                 if ((i != n) || (n > j) || (n <= 0))
1506                         {
1507                         /* wrong packet length */
1508                         al=SSL_AD_DECODE_ERROR;
1509                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1510                         goto f_err;
1511                         }
1512
1513 #ifndef OPENSSL_NO_RSA
1514                 if (pkey->type == EVP_PKEY_RSA)
1515                         {
1516                         int num;
1517
1518                         j=0;
1519                         q=md_buf;
1520                         for (num=2; num > 0; num--)
1521                                 {
1522                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1523                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1524                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1525                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1526                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1527                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1528                                 q+=i;
1529                                 j+=i;
1530                                 }
1531                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1532                                                                 pkey->pkey.rsa);
1533                         if (i < 0)
1534                                 {
1535                                 al=SSL_AD_DECRYPT_ERROR;
1536                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1537                                 goto f_err;
1538                                 }
1539                         if (i == 0)
1540                                 {
1541                                 /* bad signature */
1542                                 al=SSL_AD_DECRYPT_ERROR;
1543                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1544                                 goto f_err;
1545                                 }
1546                         }
1547                 else
1548 #endif
1549 #ifndef OPENSSL_NO_DSA
1550                         if (pkey->type == EVP_PKEY_DSA)
1551                         {
1552                         /* lets do DSS */
1553                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1554                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1555                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1556                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1557                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1558                                 {
1559                                 /* bad signature */
1560                                 al=SSL_AD_DECRYPT_ERROR;
1561                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1562                                 goto f_err;
1563                                 }
1564                         }
1565                 else
1566 #endif
1567 #ifndef OPENSSL_NO_ECDSA
1568                         if (pkey->type == EVP_PKEY_EC)
1569                         {
1570                         /* let's do ECDSA */
1571                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1572                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1573                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1574                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1575                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1576                                 {
1577                                 /* bad signature */
1578                                 al=SSL_AD_DECRYPT_ERROR;
1579                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1580                                 goto f_err;
1581                                 }
1582                         }
1583                 else
1584 #endif
1585                         {
1586                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1587                         goto err;
1588                         }
1589                 }
1590         else
1591                 {
1592                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1593                         /* aNULL or kPSK do not need public keys */
1594                         {
1595                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1596                         goto err;
1597                         }
1598                 /* still data left over */
1599                 if (n != 0)
1600                         {
1601                         al=SSL_AD_DECODE_ERROR;
1602                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1603                         goto f_err;
1604                         }
1605                 }
1606         EVP_PKEY_free(pkey);
1607         EVP_MD_CTX_cleanup(&md_ctx);
1608         return(1);
1609 f_err:
1610         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1611 err:
1612         EVP_PKEY_free(pkey);
1613 #ifndef OPENSSL_NO_RSA
1614         if (rsa != NULL)
1615                 RSA_free(rsa);
1616 #endif
1617 #ifndef OPENSSL_NO_DH
1618         if (dh != NULL)
1619                 DH_free(dh);
1620 #endif
1621 #ifndef OPENSSL_NO_ECDH
1622         BN_CTX_free(bn_ctx);
1623         EC_POINT_free(srvr_ecpoint);
1624         if (ecdh != NULL)
1625                 EC_KEY_free(ecdh);
1626 #endif
1627         EVP_MD_CTX_cleanup(&md_ctx);
1628         return(-1);
1629         }
1630
1631 int ssl3_get_certificate_request(SSL *s)
1632         {
1633         int ok,ret=0;
1634         unsigned long n,nc,l;
1635         unsigned int llen,ctype_num,i;
1636         X509_NAME *xn=NULL;
1637         const unsigned char *p,*q;
1638         unsigned char *d;
1639         STACK_OF(X509_NAME) *ca_sk=NULL;
1640
1641         n=s->method->ssl_get_message(s,
1642                 SSL3_ST_CR_CERT_REQ_A,
1643                 SSL3_ST_CR_CERT_REQ_B,
1644                 -1,
1645                 s->max_cert_list,
1646                 &ok);
1647
1648         if (!ok) return((int)n);
1649
1650         s->s3->tmp.cert_req=0;
1651
1652         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1653                 {
1654                 s->s3->tmp.reuse_message=1;
1655                 return(1);
1656                 }
1657
1658         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1659                 {
1660                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1661                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1662                 goto err;
1663                 }
1664
1665         /* TLS does not like anon-DH with client cert */
1666         if (s->version > SSL3_VERSION)
1667                 {
1668                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1669                         {
1670                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1671                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1672                         goto err;
1673                         }
1674                 }
1675
1676         p=d=(unsigned char *)s->init_msg;
1677
1678         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1679                 {
1680                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1681                 goto err;
1682                 }
1683
1684         /* get the certificate types */
1685         ctype_num= *(p++);
1686         if (ctype_num > SSL3_CT_NUMBER)
1687                 ctype_num=SSL3_CT_NUMBER;
1688         for (i=0; i<ctype_num; i++)
1689                 s->s3->tmp.ctype[i]= p[i];
1690         p+=ctype_num;
1691
1692         /* get the CA RDNs */
1693         n2s(p,llen);
1694 #if 0
1695 {
1696 FILE *out;
1697 out=fopen("/tmp/vsign.der","w");
1698 fwrite(p,1,llen,out);
1699 fclose(out);
1700 }
1701 #endif
1702
1703         if ((llen+ctype_num+2+1) != n)
1704                 {
1705                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1706                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1707                 goto err;
1708                 }
1709
1710         for (nc=0; nc<llen; )
1711                 {
1712                 n2s(p,l);
1713                 if ((l+nc+2) > llen)
1714                         {
1715                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1716                                 goto cont; /* netscape bugs */
1717                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1718                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1719                         goto err;
1720                         }
1721
1722                 q=p;
1723
1724                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1725                         {
1726                         /* If netscape tolerance is on, ignore errors */
1727                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1728                                 goto cont;
1729                         else
1730                                 {
1731                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1732                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1733                                 goto err;
1734                                 }
1735                         }
1736
1737                 if (q != (p+l))
1738                         {
1739                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1740                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1741                         goto err;
1742                         }
1743                 if (!sk_X509_NAME_push(ca_sk,xn))
1744                         {
1745                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1746                         goto err;
1747                         }
1748
1749                 p+=l;
1750                 nc+=l+2;
1751                 }
1752
1753         if (0)
1754                 {
1755 cont:
1756                 ERR_clear_error();
1757                 }
1758
1759         /* we should setup a certificate to return.... */
1760         s->s3->tmp.cert_req=1;
1761         s->s3->tmp.ctype_num=ctype_num;
1762         if (s->s3->tmp.ca_names != NULL)
1763                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1764         s->s3->tmp.ca_names=ca_sk;
1765         ca_sk=NULL;
1766
1767         ret=1;
1768 err:
1769         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1770         return(ret);
1771         }
1772
1773 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1774         {
1775         return(X509_NAME_cmp(*a,*b));
1776         }
1777 #ifndef OPENSSL_NO_TLSEXT
1778 int ssl3_get_new_session_ticket(SSL *s)
1779         {
1780         int ok,al,ret=0, ticklen;
1781         long n;
1782         const unsigned char *p;
1783         unsigned char *d;
1784
1785         n=s->method->ssl_get_message(s,
1786                 SSL3_ST_CR_SESSION_TICKET_A,
1787                 SSL3_ST_CR_SESSION_TICKET_B,
1788                 -1,
1789                 16384,
1790                 &ok);
1791
1792         if (!ok)
1793                 return((int)n);
1794
1795         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1796                 {
1797                 s->s3->tmp.reuse_message=1;
1798                 return(1);
1799                 }
1800         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1801                 {
1802                 al=SSL_AD_UNEXPECTED_MESSAGE;
1803                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1804                 goto f_err;
1805                 }
1806         if (n < 6)
1807                 {
1808                 /* need at least ticket_lifetime_hint + ticket length */
1809                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1810                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1811                 goto f_err;
1812                 }
1813         p=d=(unsigned char *)s->init_msg;
1814         n2l(p, s->session->tlsext_tick_lifetime_hint);
1815         n2s(p, ticklen);
1816         /* ticket_lifetime_hint + ticket_length + ticket */
1817         if (ticklen + 6 != n)
1818                 {
1819                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1820                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1821                 goto f_err;
1822                 }
1823         if (s->session->tlsext_tick)
1824                 {
1825                 OPENSSL_free(s->session->tlsext_tick);
1826                 s->session->tlsext_ticklen = 0;
1827                 }
1828         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1829         if (!s->session->tlsext_tick)
1830                 {
1831                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1832                 goto err;
1833                 }
1834         memcpy(s->session->tlsext_tick, p, ticklen);
1835         s->session->tlsext_ticklen = ticklen;
1836         
1837         ret=1;
1838         return(ret);
1839 f_err:
1840         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1841 err:
1842         return(-1);
1843         }
1844
1845 int ssl3_get_cert_status(SSL *s)
1846         {
1847         int ok, al;
1848         unsigned long resplen,n;
1849         const unsigned char *p;
1850
1851         n=s->method->ssl_get_message(s,
1852                 SSL3_ST_CR_CERT_STATUS_A,
1853                 SSL3_ST_CR_CERT_STATUS_B,
1854                 SSL3_MT_CERTIFICATE_STATUS,
1855                 16384,
1856                 &ok);
1857
1858         if (!ok) return((int)n);
1859         if (n < 4)
1860                 {
1861                 /* need at least status type + length */
1862                 al = SSL_AD_DECODE_ERROR;
1863                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1864                 goto f_err;
1865                 }
1866         p = (unsigned char *)s->init_msg;
1867         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1868                 {
1869                 al = SSL_AD_DECODE_ERROR;
1870                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1871                 goto f_err;
1872                 }
1873         n2l3(p, resplen);
1874         if (resplen + 4 != n)
1875                 {
1876                 al = SSL_AD_DECODE_ERROR;
1877                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1878                 goto f_err;
1879                 }
1880         if (s->tlsext_ocsp_resp)
1881                 OPENSSL_free(s->tlsext_ocsp_resp);
1882         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1883         if (!s->tlsext_ocsp_resp)
1884                 {
1885                 al = SSL_AD_INTERNAL_ERROR;
1886                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1887                 goto f_err;
1888                 }
1889         s->tlsext_ocsp_resplen = resplen;
1890         if (s->ctx->tlsext_status_cb)
1891                 {
1892                 int ret;
1893                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1894                 if (ret == 0)
1895                         {
1896                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1897                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1898                         goto f_err;
1899                         }
1900                 if (ret < 0)
1901                         {
1902                         al = SSL_AD_INTERNAL_ERROR;
1903                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1904                         goto f_err;
1905                         }
1906                 }
1907         return 1;
1908 f_err:
1909         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1910         return(-1);
1911         }
1912 #endif
1913
1914 int ssl3_get_server_done(SSL *s)
1915         {
1916         int ok,ret=0;
1917         long n;
1918
1919         n=s->method->ssl_get_message(s,
1920                 SSL3_ST_CR_SRVR_DONE_A,
1921                 SSL3_ST_CR_SRVR_DONE_B,
1922                 SSL3_MT_SERVER_DONE,
1923                 30, /* should be very small, like 0 :-) */
1924                 &ok);
1925
1926         if (!ok) return((int)n);
1927         if (n > 0)
1928                 {
1929                 /* should contain no data */
1930                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1931                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1932                 return -1;
1933                 }
1934         ret=1;
1935         return(ret);
1936         }
1937
1938
1939 int ssl3_send_client_key_exchange(SSL *s)
1940         {
1941         unsigned char *p,*d;
1942         int n;
1943         unsigned long alg_k;
1944 #ifndef OPENSSL_NO_RSA
1945         unsigned char *q;
1946         EVP_PKEY *pkey=NULL;
1947 #endif
1948 #ifndef OPENSSL_NO_KRB5
1949         KSSL_ERR kssl_err;
1950 #endif /* OPENSSL_NO_KRB5 */
1951 #ifndef OPENSSL_NO_ECDH
1952         EC_KEY *clnt_ecdh = NULL;
1953         const EC_POINT *srvr_ecpoint = NULL;
1954         EVP_PKEY *srvr_pub_pkey = NULL;
1955         unsigned char *encodedPoint = NULL;
1956         int encoded_pt_len = 0;
1957         BN_CTX * bn_ctx = NULL;
1958 #endif
1959
1960         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1961                 {
1962                 d=(unsigned char *)s->init_buf->data;
1963                 p= &(d[4]);
1964
1965                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1966
1967                 /* Fool emacs indentation */
1968                 if (0) {}
1969 #ifndef OPENSSL_NO_RSA
1970                 else if (alg_k & SSL_kRSA)
1971                         {
1972                         RSA *rsa;
1973                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1974
1975                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1976                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1977                         else
1978                                 {
1979                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1980                                 if ((pkey == NULL) ||
1981                                         (pkey->type != EVP_PKEY_RSA) ||
1982                                         (pkey->pkey.rsa == NULL))
1983                                         {
1984                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1985                                         goto err;
1986                                         }
1987                                 rsa=pkey->pkey.rsa;
1988                                 EVP_PKEY_free(pkey);
1989                                 }
1990                                 
1991                         tmp_buf[0]=s->client_version>>8;
1992                         tmp_buf[1]=s->client_version&0xff;
1993                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1994                                         goto err;
1995
1996                         s->session->master_key_length=sizeof tmp_buf;
1997
1998                         q=p;
1999                         /* Fix buf for TLS and beyond */
2000                         if (s->version > SSL3_VERSION)
2001                                 p+=2;
2002                         n=RSA_public_encrypt(sizeof tmp_buf,
2003                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2004 #ifdef PKCS1_CHECK
2005                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2006                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2007 #endif
2008                         if (n <= 0)
2009                                 {
2010                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2011                                 goto err;
2012                                 }
2013
2014                         /* Fix buf for TLS and beyond */
2015                         if (s->version > SSL3_VERSION)
2016                                 {
2017                                 s2n(n,q);
2018                                 n+=2;
2019                                 }
2020
2021                         s->session->master_key_length=
2022                                 s->method->ssl3_enc->generate_master_secret(s,
2023                                         s->session->master_key,
2024                                         tmp_buf,sizeof tmp_buf);
2025                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2026                         }
2027 #endif
2028 #ifndef OPENSSL_NO_KRB5
2029                 else if (alg_k & SSL_kKRB5)
2030                         {
2031                         krb5_error_code krb5rc;
2032                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2033                         /*  krb5_data   krb5_ap_req;  */
2034                         krb5_data       *enc_ticket;
2035                         krb5_data       authenticator, *authp = NULL;
2036                         EVP_CIPHER_CTX  ciph_ctx;
2037                         EVP_CIPHER      *enc = NULL;
2038                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2039                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2040                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
2041                                                 + EVP_MAX_IV_LENGTH];
2042                         int             padl, outl = sizeof(epms);
2043
2044                         EVP_CIPHER_CTX_init(&ciph_ctx);
2045
2046 #ifdef KSSL_DEBUG
2047                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2048                                 alg_k, SSL_kKRB5);
2049 #endif  /* KSSL_DEBUG */
2050
2051                         authp = NULL;
2052 #ifdef KRB5SENDAUTH
2053                         if (KRB5SENDAUTH)  authp = &authenticator;
2054 #endif  /* KRB5SENDAUTH */
2055
2056                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2057                                 &kssl_err);
2058                         enc = kssl_map_enc(kssl_ctx->enctype);
2059                         if (enc == NULL)
2060                             goto err;
2061 #ifdef KSSL_DEBUG
2062                         {
2063                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2064                         if (krb5rc && kssl_err.text)
2065                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2066                         }
2067 #endif  /* KSSL_DEBUG */
2068
2069                         if (krb5rc)
2070                                 {
2071                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2072                                                 SSL_AD_HANDSHAKE_FAILURE);
2073                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2074                                                 kssl_err.reason);
2075                                 goto err;
2076                                 }
2077
2078                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2079                         **  in place of RFC 2712 KerberosWrapper, as in:
2080                         **
2081                         **  Send ticket (copy to *p, set n = length)
2082                         **  n = krb5_ap_req.length;
2083                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2084                         **  if (krb5_ap_req.data)  
2085                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2086                         **
2087                         **  Now using real RFC 2712 KerberosWrapper
2088                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2089                         **  Note: 2712 "opaque" types are here replaced
2090                         **  with a 2-byte length followed by the value.
2091                         **  Example:
2092                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2093                         **  Where "xx xx" = length bytes.  Shown here with
2094                         **  optional authenticator omitted.
2095                         */
2096
2097                         /*  KerberosWrapper.Ticket              */
2098                         s2n(enc_ticket->length,p);
2099                         memcpy(p, enc_ticket->data, enc_ticket->length);
2100                         p+= enc_ticket->length;
2101                         n = enc_ticket->length + 2;
2102
2103                         /*  KerberosWrapper.Authenticator       */
2104                         if (authp  &&  authp->length)  
2105                                 {
2106                                 s2n(authp->length,p);
2107                                 memcpy(p, authp->data, authp->length);
2108                                 p+= authp->length;
2109                                 n+= authp->length + 2;
2110                                 
2111                                 free(authp->data);
2112                                 authp->data = NULL;
2113                                 authp->length = 0;
2114                                 }
2115                         else
2116                                 {
2117                                 s2n(0,p);/*  null authenticator length  */
2118                                 n+=2;
2119                                 }
2120  
2121                             tmp_buf[0]=s->client_version>>8;
2122                             tmp_buf[1]=s->client_version&0xff;
2123                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2124                                 goto err;
2125
2126                         /*  20010420 VRS.  Tried it this way; failed.
2127                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2128                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2129                         **                              kssl_ctx->length);
2130                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2131                         */
2132
2133                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2134                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2135                                 kssl_ctx->key,iv);
2136                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2137                                 sizeof tmp_buf);
2138                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2139                         outl += padl;
2140                         if (outl > sizeof epms)
2141                                 {
2142                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2143                                 goto err;
2144                                 }
2145                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2146
2147                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2148                         s2n(outl,p);
2149                         memcpy(p, epms, outl);
2150                         p+=outl;
2151                         n+=outl + 2;
2152
2153                         s->session->master_key_length=
2154                                 s->method->ssl3_enc->generate_master_secret(s,
2155                                         s->session->master_key,
2156                                         tmp_buf, sizeof tmp_buf);
2157
2158                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2159                         OPENSSL_cleanse(epms, outl);
2160                         }
2161 #endif
2162 #ifndef OPENSSL_NO_DH
2163                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2164                         {
2165                         DH *dh_srvr,*dh_clnt;
2166
2167                         if (s->session->sess_cert == NULL) 
2168                                 {
2169                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2170                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2171                                 goto err;
2172                                 }
2173
2174                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2175                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2176                         else
2177                                 {
2178                                 /* we get them from the cert */
2179                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2180                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2181                                 goto err;
2182                                 }
2183                         
2184                         /* generate a new random key */
2185                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2186                                 {
2187                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2188                                 goto err;
2189                                 }
2190                         if (!DH_generate_key(dh_clnt))
2191                                 {
2192                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2193                                 goto err;
2194                                 }
2195
2196                         /* use the 'p' output buffer for the DH key, but
2197                          * make sure to clear it out afterwards */
2198
2199                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2200
2201                         if (n <= 0)
2202                                 {
2203                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2204                                 goto err;
2205                                 }
2206
2207                         /* generate master key from the result */
2208                         s->session->master_key_length=
2209                                 s->method->ssl3_enc->generate_master_secret(s,
2210                                         s->session->master_key,p,n);
2211                         /* clean up */
2212                         memset(p,0,n);
2213
2214                         /* send off the data */
2215                         n=BN_num_bytes(dh_clnt->pub_key);
2216                         s2n(n,p);
2217                         BN_bn2bin(dh_clnt->pub_key,p);
2218                         n+=2;
2219
2220                         DH_free(dh_clnt);
2221
2222                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2223                         }
2224 #endif
2225
2226 #ifndef OPENSSL_NO_ECDH 
2227                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2228                         {
2229                         const EC_GROUP *srvr_group = NULL;
2230                         EC_KEY *tkey;
2231                         int ecdh_clnt_cert = 0;
2232                         int field_size = 0;
2233
2234                         /* Did we send out the client's
2235                          * ECDH share for use in premaster
2236                          * computation as part of client certificate?
2237                          * If so, set ecdh_clnt_cert to 1.
2238                          */
2239                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
2240                                 {
2241                                 /* XXX: For now, we do not support client
2242                                  * authentication using ECDH certificates.
2243                                  * To add such support, one needs to add
2244                                  * code that checks for appropriate 
2245                                  * conditions and sets ecdh_clnt_cert to 1.
2246                                  * For example, the cert have an ECC
2247                                  * key on the same curve as the server's
2248                                  * and the key should be authorized for
2249                                  * key agreement.
2250                                  *
2251                                  * One also needs to add code in ssl3_connect
2252                                  * to skip sending the certificate verify
2253                                  * message.
2254                                  *
2255                                  * if ((s->cert->key->privatekey != NULL) &&
2256                                  *     (s->cert->key->privatekey->type ==
2257                                  *      EVP_PKEY_EC) && ...)
2258                                  * ecdh_clnt_cert = 1;
2259                                  */
2260                                 }
2261
2262                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2263                                 {
2264                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2265                                 }
2266                         else
2267                                 {
2268                                 /* Get the Server Public Key from Cert */
2269                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2270                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2271                                 if ((srvr_pub_pkey == NULL) ||
2272                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2273                                     (srvr_pub_pkey->pkey.ec == NULL))
2274                                         {
2275                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2276                                             ERR_R_INTERNAL_ERROR);
2277                                         goto err;
2278                                         }
2279
2280                                 tkey = srvr_pub_pkey->pkey.ec;
2281                                 }
2282
2283                         srvr_group   = EC_KEY_get0_group(tkey);
2284                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2285
2286                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2287                                 {
2288                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2289                                     ERR_R_INTERNAL_ERROR);
2290                                 goto err;
2291                                 }
2292
2293                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
2294                                 {
2295                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2296                                 goto err;
2297                                 }
2298
2299                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2300                                 {
2301                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2302                                 goto err;
2303                                 }
2304                         if (ecdh_clnt_cert) 
2305                                 { 
2306                                 /* Reuse key info from our certificate
2307                                  * We only need our private key to perform
2308                                  * the ECDH computation.
2309                                  */
2310                                 const BIGNUM *priv_key;
2311                                 tkey = s->cert->key->privatekey->pkey.ec;
2312                                 priv_key = EC_KEY_get0_private_key(tkey);
2313                                 if (priv_key == NULL)
2314                                         {
2315                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2316                                         goto err;
2317                                         }
2318                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2319                                         {
2320                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2321                                         goto err;
2322                                         }
2323                                 }
2324                         else 
2325                                 {
2326                                 /* Generate a new ECDH key pair */
2327                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2328                                         {
2329                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2330                                         goto err;
2331                                         }
2332                                 }
2333
2334                         /* use the 'p' output buffer for the ECDH key, but
2335                          * make sure to clear it out afterwards
2336                          */
2337
2338                         field_size = EC_GROUP_get_degree(srvr_group);
2339                         if (field_size <= 0)
2340                                 {
2341                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2342                                        ERR_R_ECDH_LIB);
2343                                 goto err;
2344                                 }
2345                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2346                         if (n <= 0)
2347                                 {
2348                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2349                                        ERR_R_ECDH_LIB);
2350                                 goto err;
2351                                 }
2352
2353                         /* generate master key from the result */
2354                         s->session->master_key_length = s->method->ssl3_enc \
2355                             -> generate_master_secret(s, 
2356                                 s->session->master_key,
2357                                 p, n);
2358
2359                         memset(p, 0, n); /* clean up */
2360
2361                         if (ecdh_clnt_cert) 
2362                                 {
2363                                 /* Send empty client key exch message */
2364                                 n = 0;
2365                                 }
2366                         else 
2367                                 {
2368                                 /* First check the size of encoding and
2369                                  * allocate memory accordingly.
2370                                  */
2371                                 encoded_pt_len = 
2372                                     EC_POINT_point2oct(srvr_group, 
2373                                         EC_KEY_get0_public_key(clnt_ecdh), 
2374                                         POINT_CONVERSION_UNCOMPRESSED, 
2375                                         NULL, 0, NULL);
2376
2377                                 encodedPoint = (unsigned char *) 
2378                                     OPENSSL_malloc(encoded_pt_len * 
2379                                         sizeof(unsigned char)); 
2380                                 bn_ctx = BN_CTX_new();
2381                                 if ((encodedPoint == NULL) || 
2382                                     (bn_ctx == NULL)) 
2383                                         {
2384                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2385                                         goto err;
2386                                         }
2387
2388                                 /* Encode the public key */
2389                                 n = EC_POINT_point2oct(srvr_group, 
2390                                     EC_KEY_get0_public_key(clnt_ecdh), 
2391                                     POINT_CONVERSION_UNCOMPRESSED, 
2392                                     encodedPoint, encoded_pt_len, bn_ctx);
2393
2394                                 *p = n; /* length of encoded point */
2395                                 /* Encoded point will be copied here */
2396                                 p += 1; 
2397                                 /* copy the point */
2398                                 memcpy((unsigned char *)p, encodedPoint, n);
2399                                 /* increment n to account for length field */
2400                                 n += 1; 
2401                                 }
2402
2403                         /* Free allocated memory */
2404                         BN_CTX_free(bn_ctx);
2405                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2406                         if (clnt_ecdh != NULL) 
2407                                  EC_KEY_free(clnt_ecdh);
2408                         EVP_PKEY_free(srvr_pub_pkey);
2409                         }
2410 #endif /* !OPENSSL_NO_ECDH */
2411                 else if (alg_k & SSL_kGOST) 
2412                         {
2413                         /* GOST key exchange message creation */
2414                         EVP_PKEY_CTX *pkey_ctx;
2415                         X509 *peer_cert; 
2416                         size_t msglen;
2417                         unsigned int md_len;
2418                         int keytype;
2419                         unsigned char premaster_secret[32],shared_ukm[32];
2420                         EVP_MD_CTX *ukm_hash;
2421                         EVP_PKEY *pub_key;
2422
2423                         /* Get server sertificate PKEY and create ctx from it */
2424                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2425                         if (!peer_cert) 
2426                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2427                         if (!peer_cert)         {
2428                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2429                                         goto err;
2430                                 }       
2431                                 
2432                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2433                         /* If we have send a certificate, and certificate key
2434
2435                          * parameters match those of server certificate, use
2436                          * certificate key for key exchange
2437                          */
2438
2439                          /* Otherwise, generate ephemeral key pair */
2440                                         
2441                         EVP_PKEY_encrypt_init(pkey_ctx);
2442                           /* Generate session key */    
2443                     RAND_bytes(premaster_secret,32);
2444                         /* If we have client certificate, use its secret as peer key */
2445                         if (s->cert->key->privatekey) {
2446                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <0) {
2447                                         /* If there was an error - just ignore it. Ephemeral key
2448                                         * would be used
2449                                         */
2450                                         ERR_clear_error();
2451                                 } else {
2452                                         /* Set flag "client cert key is used for key
2453                                          * exchange"*/
2454                                 }       
2455                         }                       
2456                         /* Compute shared IV and store it in algorithm-specific
2457                          * context data */
2458                         ukm_hash = EVP_MD_CTX_create();
2459                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2460                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2461                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2462                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2463                         EVP_MD_CTX_destroy(ukm_hash);
2464                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2465                                 8,shared_ukm)<0) {
2466                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2467                                                 SSL_R_LIBRARY_BUG);
2468                                         goto err;
2469                                 }       
2470                         /* Make GOST keytransport blob message */
2471                         /*Encapsulate it into sequence */
2472                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2473                         *(p++)=0x81;
2474                         msglen=256;
2475                         if (EVP_PKEY_encrypt(pkey_ctx,(unsigned char *)p+1,&msglen,premaster_secret,32)<0) {
2476                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2477                                         SSL_R_LIBRARY_BUG);
2478                                 goto err;
2479                         }       
2480                         *(p++)= msglen & 0xff;
2481                         n=msglen+3;
2482                         EVP_PKEY_CTX_free(pkey_ctx);
2483                         s->session->master_key_length=
2484                                 s->method->ssl3_enc->generate_master_secret(s,
2485                                         s->session->master_key,premaster_secret,32);
2486                         EVP_PKEY_free(pub_key);
2487
2488                         }
2489 #ifndef OPENSSL_NO_PSK
2490                 else if (alg_k & SSL_kPSK)
2491                         {
2492                         char identity[PSK_MAX_IDENTITY_LEN];
2493                         unsigned char *t = NULL;
2494                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2495                         unsigned int pre_ms_len = 0, psk_len = 0;
2496                         int psk_err = 1;
2497
2498                         n = 0;
2499                         if (s->psk_client_callback == NULL)
2500                                 {
2501                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2502                                         SSL_R_PSK_NO_CLIENT_CB);
2503                                 goto err;
2504                                 }
2505
2506                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2507                                 identity, PSK_MAX_IDENTITY_LEN,
2508                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2509                         if (psk_len > PSK_MAX_PSK_LEN)
2510                                 {
2511                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2512                                         ERR_R_INTERNAL_ERROR);
2513                                 goto psk_err;
2514                                 }
2515                         else if (psk_len == 0)
2516                                 {
2517                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2518                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2519                                 goto psk_err;
2520                                 }
2521
2522                         /* create PSK pre_master_secret */
2523                         pre_ms_len = 2+psk_len+2+psk_len;
2524                         t = psk_or_pre_ms;
2525                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2526                         s2n(psk_len, t);
2527                         memset(t, 0, psk_len);
2528                         t+=psk_len;
2529                         s2n(psk_len, t);
2530
2531                         if (s->session->psk_identity_hint != NULL)
2532                                 OPENSSL_free(s->session->psk_identity_hint);
2533                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2534                         if (s->ctx->psk_identity_hint != NULL &&
2535                                 s->session->psk_identity_hint == NULL)
2536                                 {
2537                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2538                                         ERR_R_MALLOC_FAILURE);
2539                                 goto psk_err;
2540                                 }
2541
2542                         if (s->session->psk_identity != NULL)
2543                                 OPENSSL_free(s->session->psk_identity);
2544                         s->session->psk_identity = BUF_strdup(identity);
2545                         if (s->session->psk_identity == NULL)
2546                                 {
2547                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2548                                         ERR_R_MALLOC_FAILURE);
2549                                 goto psk_err;
2550                                 }
2551
2552                         s->session->master_key_length =
2553                                 s->method->ssl3_enc->generate_master_secret(s,
2554                                         s->session->master_key,
2555                                         psk_or_pre_ms, pre_ms_len); 
2556                         n = strlen(identity);
2557                         s2n(n, p);
2558                         memcpy(p, identity, n);
2559                         n+=2;
2560                         psk_err = 0;
2561                 psk_err:
2562                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2563                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2564                         if (psk_err != 0)
2565                                 {
2566                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2567                                 goto err;
2568                                 }
2569                         }
2570 #endif
2571                 else
2572                         {
2573                         ssl3_send_alert(s, SSL3_AL_FATAL,
2574                             SSL_AD_HANDSHAKE_FAILURE);
2575                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2576                             ERR_R_INTERNAL_ERROR);
2577                         goto err;
2578                         }
2579                 
2580                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2581                 l2n3(n,d);
2582
2583                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2584                 /* number of bytes to write */
2585                 s->init_num=n+4;
2586                 s->init_off=0;
2587                 }
2588
2589         /* SSL3_ST_CW_KEY_EXCH_B */
2590         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2591 err:
2592 #ifndef OPENSSL_NO_ECDH
2593         BN_CTX_free(bn_ctx);
2594         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2595         if (clnt_ecdh != NULL) 
2596                 EC_KEY_free(clnt_ecdh);
2597         EVP_PKEY_free(srvr_pub_pkey);
2598 #endif
2599         return(-1);
2600         }
2601
2602 int ssl3_send_client_verify(SSL *s)
2603         {
2604         unsigned char *p,*d;
2605         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2606         EVP_PKEY *pkey;
2607         EVP_PKEY_CTX *pctx=NULL;
2608 #ifndef OPENSSL_NO_RSA
2609         unsigned u=0;
2610 #endif
2611         unsigned long n;
2612 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2613         int j;
2614 #endif
2615
2616         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2617                 {
2618                 d=(unsigned char *)s->init_buf->data;
2619                 p= &(d[4]);
2620                 pkey=s->cert->key->privatekey;
2621 /* Create context from key and test if sha1 is allowed as digest */
2622                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2623                 EVP_PKEY_sign_init(pctx);
2624                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2625                         {
2626                         s->method->ssl3_enc->cert_verify_mac(s,
2627                                                 NID_sha1,
2628                                                 &(data[MD5_DIGEST_LENGTH]));
2629                         }
2630                 else
2631                         {
2632                         ERR_clear_error();
2633                         }
2634 #ifndef OPENSSL_NO_RSA
2635                 if (pkey->type == EVP_PKEY_RSA)
2636                         {
2637                         s->method->ssl3_enc->cert_verify_mac(s,
2638                                 NID_md5,
2639                                 &(data[0]));
2640                         if (RSA_sign(NID_md5_sha1, data,
2641                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2642                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2643                                 {
2644                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2645                                 goto err;
2646                                 }
2647                         s2n(u,p);
2648                         n=u+2;
2649                         }
2650                 else
2651 #endif
2652 #ifndef OPENSSL_NO_DSA
2653                         if (pkey->type == EVP_PKEY_DSA)
2654                         {
2655                         if (!DSA_sign(pkey->save_type,
2656                                 &(data[MD5_DIGEST_LENGTH]),
2657                                 SHA_DIGEST_LENGTH,&(p[2]),
2658                                 (unsigned int *)&j,pkey->pkey.dsa))
2659                                 {
2660                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2661                                 goto err;
2662                                 }
2663                         s2n(j,p);
2664                         n=j+2;
2665                         }
2666                 else
2667 #endif
2668 #ifndef OPENSSL_NO_ECDSA
2669                         if (pkey->type == EVP_PKEY_EC)
2670                         {
2671                         if (!ECDSA_sign(pkey->save_type,
2672                                 &(data[MD5_DIGEST_LENGTH]),
2673                                 SHA_DIGEST_LENGTH,&(p[2]),
2674                                 (unsigned int *)&j,pkey->pkey.ec))
2675                                 {
2676                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2677                                     ERR_R_ECDSA_LIB);
2678                                 goto err;
2679                                 }
2680                         s2n(j,p);
2681                         n=j+2;
2682                         }
2683                 else
2684 #endif
2685                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) 
2686                 {
2687                 unsigned char signbuf[64];
2688                 int i;
2689                 size_t sigsize=64;
2690                 s->method->ssl3_enc->cert_verify_mac(s,
2691                         NID_id_GostR3411_94,
2692                         data);
2693                 if (!EVP_PKEY_sign(pctx,signbuf,&sigsize,data,32)) {
2694                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2695                         ERR_R_INTERNAL_ERROR);
2696                         goto err;
2697                 }
2698                 for (i=63,j=0; i>=0; j++, i--) {
2699                         p[2+j]=signbuf[i];
2700                 }       
2701                 s2n(j,p);
2702                 n=j+2;
2703                 }
2704                 else
2705                 {
2706                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2707                         goto err;
2708                 }
2709                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2710                 l2n3(n,d);
2711
2712                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2713                 s->init_num=(int)n+4;
2714                 s->init_off=0;
2715                 }
2716         EVP_PKEY_CTX_free(pctx);
2717         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2718 err:
2719         EVP_PKEY_CTX_free(pctx);
2720         return(-1);
2721         }
2722
2723 int ssl3_send_client_certificate(SSL *s)
2724         {
2725         X509 *x509=NULL;
2726         EVP_PKEY *pkey=NULL;
2727         int i;
2728         unsigned long l;
2729
2730         if (s->state == SSL3_ST_CW_CERT_A)
2731                 {
2732                 if ((s->cert == NULL) ||
2733                         (s->cert->key->x509 == NULL) ||
2734                         (s->cert->key->privatekey == NULL))
2735                         s->state=SSL3_ST_CW_CERT_B;
2736                 else
2737                         s->state=SSL3_ST_CW_CERT_C;
2738                 }
2739
2740         /* We need to get a client cert */
2741         if (s->state == SSL3_ST_CW_CERT_B)
2742                 {
2743                 /* If we get an error, we need to
2744                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2745                  * We then get retied later */
2746                 i=0;
2747                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2748                 if (i < 0)
2749                         {
2750                         s->rwstate=SSL_X509_LOOKUP;
2751                         return(-1);
2752                         }
2753                 s->rwstate=SSL_NOTHING;
2754                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2755                         {
2756                         s->state=SSL3_ST_CW_CERT_B;
2757                         if (    !SSL_use_certificate(s,x509) ||
2758                                 !SSL_use_PrivateKey(s,pkey))
2759                                 i=0;
2760                         }
2761                 else if (i == 1)
2762                         {
2763                         i=0;
2764                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2765                         }
2766
2767                 if (x509 != NULL) X509_free(x509);
2768                 if (pkey != NULL) EVP_PKEY_free(pkey);
2769                 if (i == 0)
2770                         {
2771                         if (s->version == SSL3_VERSION)
2772                                 {
2773                                 s->s3->tmp.cert_req=0;
2774                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2775                                 return(1);
2776                                 }
2777                         else
2778                                 {
2779                                 s->s3->tmp.cert_req=2;
2780                                 }
2781                         }
2782
2783                 /* Ok, we have a cert */
2784                 s->state=SSL3_ST_CW_CERT_C;
2785                 }
2786
2787         if (s->state == SSL3_ST_CW_CERT_C)
2788                 {
2789                 s->state=SSL3_ST_CW_CERT_D;
2790                 l=ssl3_output_cert_chain(s,
2791                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2792                 s->init_num=(int)l;
2793                 s->init_off=0;
2794                 }
2795         /* SSL3_ST_CW_CERT_D */
2796         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2797         }
2798
2799 #define has_bits(i,m)   (((i)&(m)) == (m))
2800
2801 int ssl3_check_cert_and_algorithm(SSL *s)
2802         {
2803         int i,idx;
2804         long alg_k,alg_a;
2805         EVP_PKEY *pkey=NULL;
2806         SESS_CERT *sc;
2807 #ifndef OPENSSL_NO_RSA
2808         RSA *rsa;
2809 #endif
2810 #ifndef OPENSSL_NO_DH
2811         DH *dh;
2812 #endif
2813
2814         sc=s->session->sess_cert;
2815         if (sc == NULL)
2816                 {
2817                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2818                 goto err;
2819                 }
2820
2821         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2822         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2823
2824         /* we don't have a certificate */
2825         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2826                 return(1);
2827
2828 #ifndef OPENSSL_NO_RSA
2829         rsa=s->session->sess_cert->peer_rsa_tmp;
2830 #endif
2831 #ifndef OPENSSL_NO_DH
2832         dh=s->session->sess_cert->peer_dh_tmp;
2833 #endif
2834
2835         /* This is the passed certificate */
2836
2837         idx=sc->peer_cert_type;
2838 #ifndef OPENSSL_NO_ECDH
2839         if (idx == SSL_PKEY_ECC)
2840                 {
2841                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2842                     s->s3->tmp.new_cipher) == 0) 
2843                         { /* check failed */
2844                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2845                         goto f_err;
2846                         }
2847                 else 
2848                         {
2849                         return 1;
2850                         }
2851                 }
2852 #endif
2853         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2854         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2855         EVP_PKEY_free(pkey);
2856
2857         
2858         /* Check that we have a certificate if we require one */
2859         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2860                 {
2861                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2862                 goto f_err;
2863                 }
2864 #ifndef OPENSSL_NO_DSA
2865         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2866                 {
2867                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2868                 goto f_err;
2869                 }
2870 #endif
2871 #ifndef OPENSSL_NO_RSA
2872         if ((alg_k & SSL_kRSA) &&
2873                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2874                 {
2875                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2876                 goto f_err;
2877                 }
2878 #endif
2879 #ifndef OPENSSL_NO_DH
2880         if ((alg_k & SSL_kEDH) &&
2881                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2882                 {
2883                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2884                 goto f_err;
2885                 }
2886         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2887                 {
2888                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2889                 goto f_err;
2890                 }
2891 #ifndef OPENSSL_NO_DSA
2892         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2893                 {
2894                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2895                 goto f_err;
2896                 }
2897 #endif
2898 #endif
2899
2900         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2901                 {
2902 #ifndef OPENSSL_NO_RSA
2903                 if (alg_k & SSL_kRSA)
2904                         {
2905                         if (rsa == NULL
2906                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2907                                 {
2908                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2909                                 goto f_err;
2910                                 }
2911                         }
2912                 else
2913 #endif
2914 #ifndef OPENSSL_NO_DH
2915                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2916                             {
2917                             if (dh == NULL
2918                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2919                                 {
2920                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2921                                 goto f_err;
2922                                 }
2923                         }
2924                 else
2925 #endif
2926                         {
2927                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2928                         goto f_err;
2929                         }
2930                 }
2931         return(1);
2932 f_err:
2933         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2934 err:
2935         return(0);
2936         }
2937
2938 /* Check to see if handshake is full or resumed. Usually this is just a
2939  * case of checking to see if a cache hit has occurred. In the case of
2940  * session tickets we have to check the next message to be sure.
2941  */
2942
2943 #ifndef OPENSSL_NO_TLSEXT
2944 static int ssl3_check_finished(SSL *s)
2945         {
2946         int ok;
2947         long n;
2948         /* If we have no ticket it cannot be a resumed session. */
2949         if (!s->session->tlsext_tick)
2950                 return 1;
2951         /* this function is called when we really expect a Certificate
2952          * message, so permit appropriate message length */
2953         n=s->method->ssl_get_message(s,
2954                 SSL3_ST_CR_CERT_A,
2955                 SSL3_ST_CR_CERT_B,
2956                 -1,
2957                 s->max_cert_list,
2958                 &ok);
2959         if (!ok) return((int)n);
2960         s->s3->tmp.reuse_message = 1;
2961         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2962                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2963                 return 2;
2964
2965         return 1;
2966         }
2967 #endif
2968
2969 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2970         {
2971         int i = 0;
2972 #ifndef OPENSSL_NO_ENGINE
2973         if (s->ctx->client_cert_engine)
2974                 {
2975                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
2976                                                 SSL_get_client_CA_list(s),
2977                                                 px509, ppkey, NULL, NULL, NULL);
2978                 if (i != 0)
2979                         return i;
2980                 }
2981 #endif
2982         if (s->ctx->client_cert_cb)
2983                 i = s->ctx->client_cert_cb(s,px509,ppkey);
2984         return i;
2985         }