Make -DKSSL_DEBUG work again.
[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         if (j != 0 && j == s->session->session_id_length
792             && memcmp(p,s->session->session_id,j) == 0)
793             {
794             if(s->sid_ctx_length != s->session->sid_ctx_length
795                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
796                 {
797                 /* actually a client application bug */
798                 al=SSL_AD_ILLEGAL_PARAMETER;
799                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
800                 goto f_err;
801                 }
802             s->hit=1;
803             }
804         else    /* a miss or crap from the other end */
805                 {
806                 /* If we were trying for session-id reuse, make a new
807                  * SSL_SESSION so we don't stuff up other people */
808                 s->hit=0;
809                 if (s->session->session_id_length > 0)
810                         {
811                         if (!ssl_get_new_session(s,0))
812                                 {
813                                 al=SSL_AD_INTERNAL_ERROR;
814                                 goto f_err;
815                                 }
816                         }
817                 s->session->session_id_length=j;
818                 memcpy(s->session->session_id,p,j); /* j could be 0 */
819                 }
820         p+=j;
821         c=ssl_get_cipher_by_char(s,p);
822         if (c == NULL)
823                 {
824                 /* unknown cipher */
825                 al=SSL_AD_ILLEGAL_PARAMETER;
826                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
827                 goto f_err;
828                 }
829         p+=ssl_put_cipher_by_char(s,NULL,NULL);
830
831         sk=ssl_get_ciphers_by_id(s);
832         i=sk_SSL_CIPHER_find(sk,c);
833         if (i < 0)
834                 {
835                 /* we did not say we would use this cipher */
836                 al=SSL_AD_ILLEGAL_PARAMETER;
837                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
838                 goto f_err;
839                 }
840
841         /* Depending on the session caching (internal/external), the cipher
842            and/or cipher_id values may not be set. Make sure that
843            cipher_id is set and use it for comparison. */
844         if (s->session->cipher)
845                 s->session->cipher_id = s->session->cipher->id;
846         if (s->hit && (s->session->cipher_id != c->id))
847                 {
848                 if (!(s->options &
849                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
850                         {
851                         al=SSL_AD_ILLEGAL_PARAMETER;
852                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
853                         goto f_err;
854                         }
855                 }
856         s->s3->tmp.new_cipher=c;
857         ssl3_digest_cached_records(s);
858
859         /* lets get the compression algorithm */
860         /* COMPRESSION */
861 #ifdef OPENSSL_NO_COMP
862         if (*(p++) != 0)
863                 {
864                 al=SSL_AD_ILLEGAL_PARAMETER;
865                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
866                 goto f_err;
867                 }
868 #else
869         j= *(p++);
870         if ((j == 0) || (s->options & SSL_OP_NO_COMPRESSION))
871                 comp=NULL;
872         else
873                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
874         
875         if ((j != 0) && (comp == NULL))
876                 {
877                 al=SSL_AD_ILLEGAL_PARAMETER;
878                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
879                 goto f_err;
880                 }
881         else
882                 {
883                 s->s3->tmp.new_compression=comp;
884                 }
885 #endif
886
887 #ifndef OPENSSL_NO_TLSEXT
888         /* TLS extensions*/
889         if (s->version > SSL3_VERSION)
890                 {
891                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
892                         {
893                         /* 'al' set by ssl_parse_serverhello_tlsext */
894                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
895                         goto f_err; 
896                         }
897                 if (ssl_check_serverhello_tlsext(s) <= 0)
898                         {
899                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
900                                 goto err;
901                         }
902                 }
903 #endif
904
905         if (p != (d+n))
906                 {
907                 /* wrong packet length */
908                 al=SSL_AD_DECODE_ERROR;
909                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
910                 goto err;
911                 }
912
913         return(1);
914 f_err:
915         ssl3_send_alert(s,SSL3_AL_FATAL,al);
916 err:
917         return(-1);
918         }
919
920 int ssl3_get_server_certificate(SSL *s)
921         {
922         int al,i,ok,ret= -1;
923         unsigned long n,nc,llen,l;
924         X509 *x=NULL;
925         const unsigned char *q,*p;
926         unsigned char *d;
927         STACK_OF(X509) *sk=NULL;
928         SESS_CERT *sc;
929         EVP_PKEY *pkey=NULL;
930         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
931
932         n=s->method->ssl_get_message(s,
933                 SSL3_ST_CR_CERT_A,
934                 SSL3_ST_CR_CERT_B,
935                 -1,
936                 s->max_cert_list,
937                 &ok);
938
939         if (!ok) return((int)n);
940
941         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
942                 {
943                 s->s3->tmp.reuse_message=1;
944                 return(1);
945                 }
946
947         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
948                 {
949                 al=SSL_AD_UNEXPECTED_MESSAGE;
950                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
951                 goto f_err;
952                 }
953         p=d=(unsigned char *)s->init_msg;
954
955         if ((sk=sk_X509_new_null()) == NULL)
956                 {
957                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
958                 goto err;
959                 }
960
961         n2l3(p,llen);
962         if (llen+3 != n)
963                 {
964                 al=SSL_AD_DECODE_ERROR;
965                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
966                 goto f_err;
967                 }
968         for (nc=0; nc<llen; )
969                 {
970                 n2l3(p,l);
971                 if ((l+nc+3) > llen)
972                         {
973                         al=SSL_AD_DECODE_ERROR;
974                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
975                         goto f_err;
976                         }
977
978                 q=p;
979                 x=d2i_X509(NULL,&q,l);
980                 if (x == NULL)
981                         {
982                         al=SSL_AD_BAD_CERTIFICATE;
983                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
984                         goto f_err;
985                         }
986                 if (q != (p+l))
987                         {
988                         al=SSL_AD_DECODE_ERROR;
989                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
990                         goto f_err;
991                         }
992                 if (!sk_X509_push(sk,x))
993                         {
994                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
995                         goto err;
996                         }
997                 x=NULL;
998                 nc+=l+3;
999                 p=q;
1000                 }
1001
1002         i=ssl_verify_cert_chain(s,sk);
1003         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
1004 #ifndef OPENSSL_NO_KRB5
1005             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1006                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1007 #endif /* OPENSSL_NO_KRB5 */
1008                 )
1009                 {
1010                 al=ssl_verify_alarm_type(s->verify_result);
1011                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1012                 goto f_err; 
1013                 }
1014         ERR_clear_error(); /* but we keep s->verify_result */
1015
1016         sc=ssl_sess_cert_new();
1017         if (sc == NULL) goto err;
1018
1019         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1020         s->session->sess_cert=sc;
1021
1022         sc->cert_chain=sk;
1023         /* Inconsistency alert: cert_chain does include the peer's
1024          * certificate, which we don't include in s3_srvr.c */
1025         x=sk_X509_value(sk,0);
1026         sk=NULL;
1027         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1028
1029         pkey=X509_get_pubkey(x);
1030
1031         /* VRS: allow null cert if auth == KRB5 */
1032         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1033                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1034                     ? 0 : 1;
1035
1036 #ifdef KSSL_DEBUG
1037         printf("pkey,x = %p, %p\n", (void *)pkey,(void *)x);
1038         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1039         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1040                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1041 #endif    /* KSSL_DEBUG */
1042
1043         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1044                 {
1045                 x=NULL;
1046                 al=SSL3_AL_FATAL;
1047                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1048                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1049                 goto f_err;
1050                 }
1051
1052         i=ssl_cert_type(x,pkey);
1053         if (need_cert && i < 0)
1054                 {
1055                 x=NULL;
1056                 al=SSL3_AL_FATAL;
1057                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1058                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1059                 goto f_err;
1060                 }
1061
1062         if (need_cert)
1063                 {
1064                 sc->peer_cert_type=i;
1065                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1066                 /* Why would the following ever happen?
1067                  * We just created sc a couple of lines ago. */
1068                 if (sc->peer_pkeys[i].x509 != NULL)
1069                         X509_free(sc->peer_pkeys[i].x509);
1070                 sc->peer_pkeys[i].x509=x;
1071                 sc->peer_key= &(sc->peer_pkeys[i]);
1072
1073                 if (s->session->peer != NULL)
1074                         X509_free(s->session->peer);
1075                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1076                 s->session->peer=x;
1077                 }
1078         else
1079                 {
1080                 sc->peer_cert_type=i;
1081                 sc->peer_key= NULL;
1082
1083                 if (s->session->peer != NULL)
1084                         X509_free(s->session->peer);
1085                 s->session->peer=NULL;
1086                 }
1087         s->session->verify_result = s->verify_result;
1088
1089         x=NULL;
1090         ret=1;
1091
1092         if (0)
1093                 {
1094 f_err:
1095                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1096                 }
1097 err:
1098         EVP_PKEY_free(pkey);
1099         X509_free(x);
1100         sk_X509_pop_free(sk,X509_free);
1101         return(ret);
1102         }
1103
1104 int ssl3_get_key_exchange(SSL *s)
1105         {
1106 #ifndef OPENSSL_NO_RSA
1107         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1108 #endif
1109         EVP_MD_CTX md_ctx;
1110         unsigned char *param,*p;
1111         int al,i,j,param_len,ok;
1112         long n,alg_k,alg_a;
1113         EVP_PKEY *pkey=NULL;
1114 #ifndef OPENSSL_NO_RSA
1115         RSA *rsa=NULL;
1116 #endif
1117 #ifndef OPENSSL_NO_DH
1118         DH *dh=NULL;
1119 #endif
1120 #ifndef OPENSSL_NO_ECDH
1121         EC_KEY *ecdh = NULL;
1122         BN_CTX *bn_ctx = NULL;
1123         EC_POINT *srvr_ecpoint = NULL;
1124         int curve_nid = 0;
1125         int encoded_pt_len = 0;
1126 #endif
1127
1128         /* use same message size as in ssl3_get_certificate_request()
1129          * as ServerKeyExchange message may be skipped */
1130         n=s->method->ssl_get_message(s,
1131                 SSL3_ST_CR_KEY_EXCH_A,
1132                 SSL3_ST_CR_KEY_EXCH_B,
1133                 -1,
1134                 s->max_cert_list,
1135                 &ok);
1136         if (!ok) return((int)n);
1137
1138         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1139                 {
1140 #ifndef OPENSSL_NO_PSK
1141                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1142                    omitted if no identity hint is sent. Set
1143                    session->sess_cert anyway to avoid problems
1144                    later.*/
1145                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1146                         {
1147                         s->session->sess_cert=ssl_sess_cert_new();
1148                         if (s->ctx->psk_identity_hint)
1149                                 OPENSSL_free(s->ctx->psk_identity_hint);
1150                         s->ctx->psk_identity_hint = NULL;
1151                         }
1152 #endif
1153                 s->s3->tmp.reuse_message=1;
1154                 return(1);
1155                 }
1156
1157         param=p=(unsigned char *)s->init_msg;
1158         if (s->session->sess_cert != NULL)
1159                 {
1160 #ifndef OPENSSL_NO_RSA
1161                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1162                         {
1163                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1164                         s->session->sess_cert->peer_rsa_tmp=NULL;
1165                         }
1166 #endif
1167 #ifndef OPENSSL_NO_DH
1168                 if (s->session->sess_cert->peer_dh_tmp)
1169                         {
1170                         DH_free(s->session->sess_cert->peer_dh_tmp);
1171                         s->session->sess_cert->peer_dh_tmp=NULL;
1172                         }
1173 #endif
1174 #ifndef OPENSSL_NO_ECDH
1175                 if (s->session->sess_cert->peer_ecdh_tmp)
1176                         {
1177                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1178                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1179                         }
1180 #endif
1181                 }
1182         else
1183                 {
1184                 s->session->sess_cert=ssl_sess_cert_new();
1185                 }
1186
1187         param_len=0;
1188         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1189         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1190         EVP_MD_CTX_init(&md_ctx);
1191
1192 #ifndef OPENSSL_NO_PSK
1193         if (alg_k & SSL_kPSK)
1194                 {
1195                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1196
1197                 al=SSL_AD_HANDSHAKE_FAILURE;
1198                 n2s(p,i);
1199                 param_len=i+2;
1200                 /* Store PSK identity hint for later use, hint is used
1201                  * in ssl3_send_client_key_exchange.  Assume that the
1202                  * maximum length of a PSK identity hint can be as
1203                  * long as the maximum length of a PSK identity. */
1204                 if (i > PSK_MAX_IDENTITY_LEN)
1205                         {
1206                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1207                                 SSL_R_DATA_LENGTH_TOO_LONG);
1208                         goto f_err;
1209                         }
1210                 if (param_len > n)
1211                         {
1212                         al=SSL_AD_DECODE_ERROR;
1213                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1214                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1215                         goto f_err;
1216                         }
1217                 /* If received PSK identity hint contains NULL
1218                  * characters, the hint is truncated from the first
1219                  * NULL. p may not be ending with NULL, so create a
1220                  * NULL-terminated string. */
1221                 memcpy(tmp_id_hint, p, i);
1222                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1223                 if (s->ctx->psk_identity_hint != NULL)
1224                         OPENSSL_free(s->ctx->psk_identity_hint);
1225                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1226                 if (s->ctx->psk_identity_hint == NULL)
1227                         {
1228                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1229                         goto f_err;
1230                         }          
1231
1232                 p+=i;
1233                 n-=param_len;
1234                 }
1235         else
1236 #endif /* !OPENSSL_NO_PSK */
1237 #ifndef OPENSSL_NO_RSA
1238         if (alg_k & SSL_kRSA)
1239                 {
1240                 if ((rsa=RSA_new()) == NULL)
1241                         {
1242                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1243                         goto err;
1244                         }
1245                 n2s(p,i);
1246                 param_len=i+2;
1247                 if (param_len > n)
1248                         {
1249                         al=SSL_AD_DECODE_ERROR;
1250                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1251                         goto f_err;
1252                         }
1253                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1254                         {
1255                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1256                         goto err;
1257                         }
1258                 p+=i;
1259
1260                 n2s(p,i);
1261                 param_len+=i+2;
1262                 if (param_len > n)
1263                         {
1264                         al=SSL_AD_DECODE_ERROR;
1265                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1266                         goto f_err;
1267                         }
1268                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1269                         {
1270                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1271                         goto err;
1272                         }
1273                 p+=i;
1274                 n-=param_len;
1275
1276                 /* this should be because we are using an export cipher */
1277                 if (alg_a & SSL_aRSA)
1278                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1279                 else
1280                         {
1281                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1282                         goto err;
1283                         }
1284                 s->session->sess_cert->peer_rsa_tmp=rsa;
1285                 rsa=NULL;
1286                 }
1287 #else /* OPENSSL_NO_RSA */
1288         if (0)
1289                 ;
1290 #endif
1291 #ifndef OPENSSL_NO_DH
1292         else if (alg_k & SSL_kEDH)
1293                 {
1294                 if ((dh=DH_new()) == NULL)
1295                         {
1296                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1297                         goto err;
1298                         }
1299                 n2s(p,i);
1300                 param_len=i+2;
1301                 if (param_len > n)
1302                         {
1303                         al=SSL_AD_DECODE_ERROR;
1304                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1305                         goto f_err;
1306                         }
1307                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1308                         {
1309                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1310                         goto err;
1311                         }
1312                 p+=i;
1313
1314                 n2s(p,i);
1315                 param_len+=i+2;
1316                 if (param_len > n)
1317                         {
1318                         al=SSL_AD_DECODE_ERROR;
1319                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1320                         goto f_err;
1321                         }
1322                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1323                         {
1324                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1325                         goto err;
1326                         }
1327                 p+=i;
1328
1329                 n2s(p,i);
1330                 param_len+=i+2;
1331                 if (param_len > n)
1332                         {
1333                         al=SSL_AD_DECODE_ERROR;
1334                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1335                         goto f_err;
1336                         }
1337                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1338                         {
1339                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1340                         goto err;
1341                         }
1342                 p+=i;
1343                 n-=param_len;
1344
1345 #ifndef OPENSSL_NO_RSA
1346                 if (alg_a & SSL_aRSA)
1347                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1348 #else
1349                 if (0)
1350                         ;
1351 #endif
1352 #ifndef OPENSSL_NO_DSA
1353                 else if (alg_a & SSL_aDSS)
1354                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1355 #endif
1356                 /* else anonymous DH, so no certificate or pkey. */
1357
1358                 s->session->sess_cert->peer_dh_tmp=dh;
1359                 dh=NULL;
1360                 }
1361         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1362                 {
1363                 al=SSL_AD_ILLEGAL_PARAMETER;
1364                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1365                 goto f_err;
1366                 }
1367 #endif /* !OPENSSL_NO_DH */
1368
1369 #ifndef OPENSSL_NO_ECDH
1370         else if (alg_k & SSL_kEECDH)
1371                 {
1372                 EC_GROUP *ngroup;
1373                 const EC_GROUP *group;
1374
1375                 if ((ecdh=EC_KEY_new()) == NULL)
1376                         {
1377                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1378                         goto err;
1379                         }
1380
1381                 /* Extract elliptic curve parameters and the
1382                  * server's ephemeral ECDH public key.
1383                  * Keep accumulating lengths of various components in
1384                  * param_len and make sure it never exceeds n.
1385                  */
1386
1387                 /* XXX: For now we only support named (not generic) curves
1388                  * and the ECParameters in this case is just three bytes.
1389                  */
1390                 param_len=3;
1391                 if ((param_len > n) ||
1392                     (*p != NAMED_CURVE_TYPE) || 
1393                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)) 
1394                         {
1395                         al=SSL_AD_INTERNAL_ERROR;
1396                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1397                         goto f_err;
1398                         }
1399
1400                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1401                 if (ngroup == NULL)
1402                         {
1403                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1404                         goto err;
1405                         }
1406                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1407                         {
1408                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1409                         goto err;
1410                         }
1411                 EC_GROUP_free(ngroup);
1412
1413                 group = EC_KEY_get0_group(ecdh);
1414
1415                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1416                     (EC_GROUP_get_degree(group) > 163))
1417                         {
1418                         al=SSL_AD_EXPORT_RESTRICTION;
1419                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1420                         goto f_err;
1421                         }
1422
1423                 p+=3;
1424
1425                 /* Next, get the encoded ECPoint */
1426                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1427                     ((bn_ctx = BN_CTX_new()) == NULL))
1428                         {
1429                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1430                         goto err;
1431                         }
1432
1433                 encoded_pt_len = *p;  /* length of encoded point */
1434                 p+=1;
1435                 param_len += (1 + encoded_pt_len);
1436                 if ((param_len > n) ||
1437                     (EC_POINT_oct2point(group, srvr_ecpoint, 
1438                         p, encoded_pt_len, bn_ctx) == 0))
1439                         {
1440                         al=SSL_AD_DECODE_ERROR;
1441                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1442                         goto f_err;
1443                         }
1444
1445                 n-=param_len;
1446                 p+=encoded_pt_len;
1447
1448                 /* The ECC/TLS specification does not mention
1449                  * the use of DSA to sign ECParameters in the server
1450                  * key exchange message. We do support RSA and ECDSA.
1451                  */
1452                 if (0) ;
1453 #ifndef OPENSSL_NO_RSA
1454                 else if (alg_a & SSL_aRSA)
1455                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1456 #endif
1457 #ifndef OPENSSL_NO_ECDSA
1458                 else if (alg_a & SSL_aECDSA)
1459                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1460 #endif
1461                 /* else anonymous ECDH, so no certificate or pkey. */
1462                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1463                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1464                 ecdh=NULL;
1465                 BN_CTX_free(bn_ctx);
1466                 EC_POINT_free(srvr_ecpoint);
1467                 srvr_ecpoint = NULL;
1468                 }
1469         else if (alg_k)
1470                 {
1471                 al=SSL_AD_UNEXPECTED_MESSAGE;
1472                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1473                 goto f_err;
1474                 }
1475 #endif /* !OPENSSL_NO_ECDH */
1476
1477
1478         /* p points to the next byte, there are 'n' bytes left */
1479
1480         /* if it was signed, check the signature */
1481         if (pkey != NULL)
1482                 {
1483                 n2s(p,i);
1484                 n-=2;
1485                 j=EVP_PKEY_size(pkey);
1486
1487                 if ((i != n) || (n > j) || (n <= 0))
1488                         {
1489                         /* wrong packet length */
1490                         al=SSL_AD_DECODE_ERROR;
1491                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1492                         goto f_err;
1493                         }
1494
1495 #ifndef OPENSSL_NO_RSA
1496                 if (pkey->type == EVP_PKEY_RSA)
1497                         {
1498                         int num;
1499
1500                         j=0;
1501                         q=md_buf;
1502                         for (num=2; num > 0; num--)
1503                                 {
1504                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1505                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1506                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1507                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1508                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1509                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1510                                 q+=i;
1511                                 j+=i;
1512                                 }
1513                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1514                                                                 pkey->pkey.rsa);
1515                         if (i < 0)
1516                                 {
1517                                 al=SSL_AD_DECRYPT_ERROR;
1518                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1519                                 goto f_err;
1520                                 }
1521                         if (i == 0)
1522                                 {
1523                                 /* bad signature */
1524                                 al=SSL_AD_DECRYPT_ERROR;
1525                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1526                                 goto f_err;
1527                                 }
1528                         }
1529                 else
1530 #endif
1531 #ifndef OPENSSL_NO_DSA
1532                         if (pkey->type == EVP_PKEY_DSA)
1533                         {
1534                         /* lets do DSS */
1535                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1536                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1537                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1538                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1539                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
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_ECDSA
1550                         if (pkey->type == EVP_PKEY_EC)
1551                         {
1552                         /* let's do ECDSA */
1553                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), 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))
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                         {
1568                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1569                         goto err;
1570                         }
1571                 }
1572         else
1573                 {
1574                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1575                         /* aNULL or kPSK do not need public keys */
1576                         {
1577                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1578                         goto err;
1579                         }
1580                 /* still data left over */
1581                 if (n != 0)
1582                         {
1583                         al=SSL_AD_DECODE_ERROR;
1584                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1585                         goto f_err;
1586                         }
1587                 }
1588         EVP_PKEY_free(pkey);
1589         EVP_MD_CTX_cleanup(&md_ctx);
1590         return(1);
1591 f_err:
1592         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1593 err:
1594         EVP_PKEY_free(pkey);
1595 #ifndef OPENSSL_NO_RSA
1596         if (rsa != NULL)
1597                 RSA_free(rsa);
1598 #endif
1599 #ifndef OPENSSL_NO_DH
1600         if (dh != NULL)
1601                 DH_free(dh);
1602 #endif
1603 #ifndef OPENSSL_NO_ECDH
1604         BN_CTX_free(bn_ctx);
1605         EC_POINT_free(srvr_ecpoint);
1606         if (ecdh != NULL)
1607                 EC_KEY_free(ecdh);
1608 #endif
1609         EVP_MD_CTX_cleanup(&md_ctx);
1610         return(-1);
1611         }
1612
1613 int ssl3_get_certificate_request(SSL *s)
1614         {
1615         int ok,ret=0;
1616         unsigned long n,nc,l;
1617         unsigned int llen,ctype_num,i;
1618         X509_NAME *xn=NULL;
1619         const unsigned char *p,*q;
1620         unsigned char *d;
1621         STACK_OF(X509_NAME) *ca_sk=NULL;
1622
1623         n=s->method->ssl_get_message(s,
1624                 SSL3_ST_CR_CERT_REQ_A,
1625                 SSL3_ST_CR_CERT_REQ_B,
1626                 -1,
1627                 s->max_cert_list,
1628                 &ok);
1629
1630         if (!ok) return((int)n);
1631
1632         s->s3->tmp.cert_req=0;
1633
1634         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1635                 {
1636                 s->s3->tmp.reuse_message=1;
1637                 return(1);
1638                 }
1639
1640         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1641                 {
1642                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1643                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1644                 goto err;
1645                 }
1646
1647         /* TLS does not like anon-DH with client cert */
1648         if (s->version > SSL3_VERSION)
1649                 {
1650                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1651                         {
1652                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1653                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1654                         goto err;
1655                         }
1656                 }
1657
1658         p=d=(unsigned char *)s->init_msg;
1659
1660         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1661                 {
1662                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1663                 goto err;
1664                 }
1665
1666         /* get the certificate types */
1667         ctype_num= *(p++);
1668         if (ctype_num > SSL3_CT_NUMBER)
1669                 ctype_num=SSL3_CT_NUMBER;
1670         for (i=0; i<ctype_num; i++)
1671                 s->s3->tmp.ctype[i]= p[i];
1672         p+=ctype_num;
1673
1674         /* get the CA RDNs */
1675         n2s(p,llen);
1676 #if 0
1677 {
1678 FILE *out;
1679 out=fopen("/tmp/vsign.der","w");
1680 fwrite(p,1,llen,out);
1681 fclose(out);
1682 }
1683 #endif
1684
1685         if ((llen+ctype_num+2+1) != n)
1686                 {
1687                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1688                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1689                 goto err;
1690                 }
1691
1692         for (nc=0; nc<llen; )
1693                 {
1694                 n2s(p,l);
1695                 if ((l+nc+2) > llen)
1696                         {
1697                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1698                                 goto cont; /* netscape bugs */
1699                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1700                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1701                         goto err;
1702                         }
1703
1704                 q=p;
1705
1706                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1707                         {
1708                         /* If netscape tolerance is on, ignore errors */
1709                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1710                                 goto cont;
1711                         else
1712                                 {
1713                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1714                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1715                                 goto err;
1716                                 }
1717                         }
1718
1719                 if (q != (p+l))
1720                         {
1721                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1722                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1723                         goto err;
1724                         }
1725                 if (!sk_X509_NAME_push(ca_sk,xn))
1726                         {
1727                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1728                         goto err;
1729                         }
1730
1731                 p+=l;
1732                 nc+=l+2;
1733                 }
1734
1735         if (0)
1736                 {
1737 cont:
1738                 ERR_clear_error();
1739                 }
1740
1741         /* we should setup a certificate to return.... */
1742         s->s3->tmp.cert_req=1;
1743         s->s3->tmp.ctype_num=ctype_num;
1744         if (s->s3->tmp.ca_names != NULL)
1745                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1746         s->s3->tmp.ca_names=ca_sk;
1747         ca_sk=NULL;
1748
1749         ret=1;
1750 err:
1751         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1752         return(ret);
1753         }
1754
1755 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1756         {
1757         return(X509_NAME_cmp(*a,*b));
1758         }
1759 #ifndef OPENSSL_NO_TLSEXT
1760 int ssl3_get_new_session_ticket(SSL *s)
1761         {
1762         int ok,al,ret=0, ticklen;
1763         long n;
1764         const unsigned char *p;
1765         unsigned char *d;
1766
1767         n=s->method->ssl_get_message(s,
1768                 SSL3_ST_CR_SESSION_TICKET_A,
1769                 SSL3_ST_CR_SESSION_TICKET_B,
1770                 -1,
1771                 16384,
1772                 &ok);
1773
1774         if (!ok)
1775                 return((int)n);
1776
1777         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1778                 {
1779                 s->s3->tmp.reuse_message=1;
1780                 return(1);
1781                 }
1782         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1783                 {
1784                 al=SSL_AD_UNEXPECTED_MESSAGE;
1785                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1786                 goto f_err;
1787                 }
1788         if (n < 6)
1789                 {
1790                 /* need at least ticket_lifetime_hint + ticket length */
1791                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1792                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1793                 goto f_err;
1794                 }
1795         p=d=(unsigned char *)s->init_msg;
1796         n2l(p, s->session->tlsext_tick_lifetime_hint);
1797         n2s(p, ticklen);
1798         /* ticket_lifetime_hint + ticket_length + ticket */
1799         if (ticklen + 6 != n)
1800                 {
1801                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1802                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1803                 goto f_err;
1804                 }
1805         if (s->session->tlsext_tick)
1806                 {
1807                 OPENSSL_free(s->session->tlsext_tick);
1808                 s->session->tlsext_ticklen = 0;
1809                 }
1810         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1811         if (!s->session->tlsext_tick)
1812                 {
1813                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1814                 goto err;
1815                 }
1816         memcpy(s->session->tlsext_tick, p, ticklen);
1817         s->session->tlsext_ticklen = ticklen;
1818         
1819         ret=1;
1820         return(ret);
1821 f_err:
1822         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1823 err:
1824         return(-1);
1825         }
1826
1827 int ssl3_get_cert_status(SSL *s)
1828         {
1829         int ok, al;
1830         unsigned long resplen,n;
1831         const unsigned char *p;
1832
1833         n=s->method->ssl_get_message(s,
1834                 SSL3_ST_CR_CERT_STATUS_A,
1835                 SSL3_ST_CR_CERT_STATUS_B,
1836                 SSL3_MT_CERTIFICATE_STATUS,
1837                 16384,
1838                 &ok);
1839
1840         if (!ok) return((int)n);
1841         if (n < 4)
1842                 {
1843                 /* need at least status type + length */
1844                 al = SSL_AD_DECODE_ERROR;
1845                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1846                 goto f_err;
1847                 }
1848         p = (unsigned char *)s->init_msg;
1849         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1850                 {
1851                 al = SSL_AD_DECODE_ERROR;
1852                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1853                 goto f_err;
1854                 }
1855         n2l3(p, resplen);
1856         if (resplen + 4 != n)
1857                 {
1858                 al = SSL_AD_DECODE_ERROR;
1859                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1860                 goto f_err;
1861                 }
1862         if (s->tlsext_ocsp_resp)
1863                 OPENSSL_free(s->tlsext_ocsp_resp);
1864         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1865         if (!s->tlsext_ocsp_resp)
1866                 {
1867                 al = SSL_AD_INTERNAL_ERROR;
1868                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1869                 goto f_err;
1870                 }
1871         s->tlsext_ocsp_resplen = resplen;
1872         if (s->ctx->tlsext_status_cb)
1873                 {
1874                 int ret;
1875                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1876                 if (ret == 0)
1877                         {
1878                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1879                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1880                         goto f_err;
1881                         }
1882                 if (ret < 0)
1883                         {
1884                         al = SSL_AD_INTERNAL_ERROR;
1885                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1886                         goto f_err;
1887                         }
1888                 }
1889         return 1;
1890 f_err:
1891         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1892         return(-1);
1893         }
1894 #endif
1895
1896 int ssl3_get_server_done(SSL *s)
1897         {
1898         int ok,ret=0;
1899         long n;
1900
1901         n=s->method->ssl_get_message(s,
1902                 SSL3_ST_CR_SRVR_DONE_A,
1903                 SSL3_ST_CR_SRVR_DONE_B,
1904                 SSL3_MT_SERVER_DONE,
1905                 30, /* should be very small, like 0 :-) */
1906                 &ok);
1907
1908         if (!ok) return((int)n);
1909         if (n > 0)
1910                 {
1911                 /* should contain no data */
1912                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1913                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1914                 return -1;
1915                 }
1916         ret=1;
1917         return(ret);
1918         }
1919
1920
1921 int ssl3_send_client_key_exchange(SSL *s)
1922         {
1923         unsigned char *p,*d;
1924         int n;
1925         unsigned long alg_k;
1926 #ifndef OPENSSL_NO_RSA
1927         unsigned char *q;
1928         EVP_PKEY *pkey=NULL;
1929 #endif
1930 #ifndef OPENSSL_NO_KRB5
1931         KSSL_ERR kssl_err;
1932 #endif /* OPENSSL_NO_KRB5 */
1933 #ifndef OPENSSL_NO_ECDH
1934         EC_KEY *clnt_ecdh = NULL;
1935         const EC_POINT *srvr_ecpoint = NULL;
1936         EVP_PKEY *srvr_pub_pkey = NULL;
1937         unsigned char *encodedPoint = NULL;
1938         int encoded_pt_len = 0;
1939         BN_CTX * bn_ctx = NULL;
1940 #endif
1941
1942         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1943                 {
1944                 d=(unsigned char *)s->init_buf->data;
1945                 p= &(d[4]);
1946
1947                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1948
1949                 /* Fool emacs indentation */
1950                 if (0) {}
1951 #ifndef OPENSSL_NO_RSA
1952                 else if (alg_k & SSL_kRSA)
1953                         {
1954                         RSA *rsa;
1955                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1956
1957                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1958                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1959                         else
1960                                 {
1961                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1962                                 if ((pkey == NULL) ||
1963                                         (pkey->type != EVP_PKEY_RSA) ||
1964                                         (pkey->pkey.rsa == NULL))
1965                                         {
1966                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1967                                         goto err;
1968                                         }
1969                                 rsa=pkey->pkey.rsa;
1970                                 EVP_PKEY_free(pkey);
1971                                 }
1972                                 
1973                         tmp_buf[0]=s->client_version>>8;
1974                         tmp_buf[1]=s->client_version&0xff;
1975                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1976                                         goto err;
1977
1978                         s->session->master_key_length=sizeof tmp_buf;
1979
1980                         q=p;
1981                         /* Fix buf for TLS and beyond */
1982                         if (s->version > SSL3_VERSION)
1983                                 p+=2;
1984                         n=RSA_public_encrypt(sizeof tmp_buf,
1985                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1986 #ifdef PKCS1_CHECK
1987                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1988                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1989 #endif
1990                         if (n <= 0)
1991                                 {
1992                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1993                                 goto err;
1994                                 }
1995
1996                         /* Fix buf for TLS and beyond */
1997                         if (s->version > SSL3_VERSION)
1998                                 {
1999                                 s2n(n,q);
2000                                 n+=2;
2001                                 }
2002
2003                         s->session->master_key_length=
2004                                 s->method->ssl3_enc->generate_master_secret(s,
2005                                         s->session->master_key,
2006                                         tmp_buf,sizeof tmp_buf);
2007                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2008                         }
2009 #endif
2010 #ifndef OPENSSL_NO_KRB5
2011                 else if (alg_k & SSL_kKRB5)
2012                         {
2013                         krb5_error_code krb5rc;
2014                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2015                         /*  krb5_data   krb5_ap_req;  */
2016                         krb5_data       *enc_ticket;
2017                         krb5_data       authenticator, *authp = NULL;
2018                         EVP_CIPHER_CTX  ciph_ctx;
2019                         EVP_CIPHER      *enc = NULL;
2020                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2021                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2022                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
2023                                                 + EVP_MAX_IV_LENGTH];
2024                         int             padl, outl = sizeof(epms);
2025
2026                         EVP_CIPHER_CTX_init(&ciph_ctx);
2027
2028 #ifdef KSSL_DEBUG
2029                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2030                                 alg_k, SSL_kKRB5);
2031 #endif  /* KSSL_DEBUG */
2032
2033                         authp = NULL;
2034 #ifdef KRB5SENDAUTH
2035                         if (KRB5SENDAUTH)  authp = &authenticator;
2036 #endif  /* KRB5SENDAUTH */
2037
2038                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2039                                 &kssl_err);
2040                         enc = kssl_map_enc(kssl_ctx->enctype);
2041                         if (enc == NULL)
2042                             goto err;
2043 #ifdef KSSL_DEBUG
2044                         {
2045                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2046                         if (krb5rc && kssl_err.text)
2047                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2048                         }
2049 #endif  /* KSSL_DEBUG */
2050
2051                         if (krb5rc)
2052                                 {
2053                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2054                                                 SSL_AD_HANDSHAKE_FAILURE);
2055                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2056                                                 kssl_err.reason);
2057                                 goto err;
2058                                 }
2059
2060                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2061                         **  in place of RFC 2712 KerberosWrapper, as in:
2062                         **
2063                         **  Send ticket (copy to *p, set n = length)
2064                         **  n = krb5_ap_req.length;
2065                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2066                         **  if (krb5_ap_req.data)  
2067                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2068                         **
2069                         **  Now using real RFC 2712 KerberosWrapper
2070                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2071                         **  Note: 2712 "opaque" types are here replaced
2072                         **  with a 2-byte length followed by the value.
2073                         **  Example:
2074                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2075                         **  Where "xx xx" = length bytes.  Shown here with
2076                         **  optional authenticator omitted.
2077                         */
2078
2079                         /*  KerberosWrapper.Ticket              */
2080                         s2n(enc_ticket->length,p);
2081                         memcpy(p, enc_ticket->data, enc_ticket->length);
2082                         p+= enc_ticket->length;
2083                         n = enc_ticket->length + 2;
2084
2085                         /*  KerberosWrapper.Authenticator       */
2086                         if (authp  &&  authp->length)  
2087                                 {
2088                                 s2n(authp->length,p);
2089                                 memcpy(p, authp->data, authp->length);
2090                                 p+= authp->length;
2091                                 n+= authp->length + 2;
2092                                 
2093                                 free(authp->data);
2094                                 authp->data = NULL;
2095                                 authp->length = 0;
2096                                 }
2097                         else
2098                                 {
2099                                 s2n(0,p);/*  null authenticator length  */
2100                                 n+=2;
2101                                 }
2102  
2103                             tmp_buf[0]=s->client_version>>8;
2104                             tmp_buf[1]=s->client_version&0xff;
2105                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2106                                 goto err;
2107
2108                         /*  20010420 VRS.  Tried it this way; failed.
2109                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2110                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2111                         **                              kssl_ctx->length);
2112                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2113                         */
2114
2115                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2116                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2117                                 kssl_ctx->key,iv);
2118                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2119                                 sizeof tmp_buf);
2120                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2121                         outl += padl;
2122                         if (outl > sizeof epms)
2123                                 {
2124                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2125                                 goto err;
2126                                 }
2127                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2128
2129                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2130                         s2n(outl,p);
2131                         memcpy(p, epms, outl);
2132                         p+=outl;
2133                         n+=outl + 2;
2134
2135                         s->session->master_key_length=
2136                                 s->method->ssl3_enc->generate_master_secret(s,
2137                                         s->session->master_key,
2138                                         tmp_buf, sizeof tmp_buf);
2139
2140                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2141                         OPENSSL_cleanse(epms, outl);
2142                         }
2143 #endif
2144 #ifndef OPENSSL_NO_DH
2145                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2146                         {
2147                         DH *dh_srvr,*dh_clnt;
2148
2149                         if (s->session->sess_cert == NULL) 
2150                                 {
2151                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2152                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2153                                 goto err;
2154                                 }
2155
2156                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2157                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2158                         else
2159                                 {
2160                                 /* we get them from the cert */
2161                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2162                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2163                                 goto err;
2164                                 }
2165                         
2166                         /* generate a new random key */
2167                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2168                                 {
2169                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2170                                 goto err;
2171                                 }
2172                         if (!DH_generate_key(dh_clnt))
2173                                 {
2174                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2175                                 goto err;
2176                                 }
2177
2178                         /* use the 'p' output buffer for the DH key, but
2179                          * make sure to clear it out afterwards */
2180
2181                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2182
2183                         if (n <= 0)
2184                                 {
2185                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2186                                 goto err;
2187                                 }
2188
2189                         /* generate master key from the result */
2190                         s->session->master_key_length=
2191                                 s->method->ssl3_enc->generate_master_secret(s,
2192                                         s->session->master_key,p,n);
2193                         /* clean up */
2194                         memset(p,0,n);
2195
2196                         /* send off the data */
2197                         n=BN_num_bytes(dh_clnt->pub_key);
2198                         s2n(n,p);
2199                         BN_bn2bin(dh_clnt->pub_key,p);
2200                         n+=2;
2201
2202                         DH_free(dh_clnt);
2203
2204                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2205                         }
2206 #endif
2207
2208 #ifndef OPENSSL_NO_ECDH 
2209                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2210                         {
2211                         const EC_GROUP *srvr_group = NULL;
2212                         EC_KEY *tkey;
2213                         int ecdh_clnt_cert = 0;
2214                         int field_size = 0;
2215
2216                         /* Did we send out the client's
2217                          * ECDH share for use in premaster
2218                          * computation as part of client certificate?
2219                          * If so, set ecdh_clnt_cert to 1.
2220                          */
2221                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
2222                                 {
2223                                 /* XXX: For now, we do not support client
2224                                  * authentication using ECDH certificates.
2225                                  * To add such support, one needs to add
2226                                  * code that checks for appropriate 
2227                                  * conditions and sets ecdh_clnt_cert to 1.
2228                                  * For example, the cert have an ECC
2229                                  * key on the same curve as the server's
2230                                  * and the key should be authorized for
2231                                  * key agreement.
2232                                  *
2233                                  * One also needs to add code in ssl3_connect
2234                                  * to skip sending the certificate verify
2235                                  * message.
2236                                  *
2237                                  * if ((s->cert->key->privatekey != NULL) &&
2238                                  *     (s->cert->key->privatekey->type ==
2239                                  *      EVP_PKEY_EC) && ...)
2240                                  * ecdh_clnt_cert = 1;
2241                                  */
2242                                 }
2243
2244                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2245                                 {
2246                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2247                                 }
2248                         else
2249                                 {
2250                                 /* Get the Server Public Key from Cert */
2251                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2252                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2253                                 if ((srvr_pub_pkey == NULL) ||
2254                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2255                                     (srvr_pub_pkey->pkey.ec == NULL))
2256                                         {
2257                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2258                                             ERR_R_INTERNAL_ERROR);
2259                                         goto err;
2260                                         }
2261
2262                                 tkey = srvr_pub_pkey->pkey.ec;
2263                                 }
2264
2265                         srvr_group   = EC_KEY_get0_group(tkey);
2266                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2267
2268                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2269                                 {
2270                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2271                                     ERR_R_INTERNAL_ERROR);
2272                                 goto err;
2273                                 }
2274
2275                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
2276                                 {
2277                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2278                                 goto err;
2279                                 }
2280
2281                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2282                                 {
2283                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2284                                 goto err;
2285                                 }
2286                         if (ecdh_clnt_cert) 
2287                                 { 
2288                                 /* Reuse key info from our certificate
2289                                  * We only need our private key to perform
2290                                  * the ECDH computation.
2291                                  */
2292                                 const BIGNUM *priv_key;
2293                                 tkey = s->cert->key->privatekey->pkey.ec;
2294                                 priv_key = EC_KEY_get0_private_key(tkey);
2295                                 if (priv_key == NULL)
2296                                         {
2297                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2298                                         goto err;
2299                                         }
2300                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2301                                         {
2302                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2303                                         goto err;
2304                                         }
2305                                 }
2306                         else 
2307                                 {
2308                                 /* Generate a new ECDH key pair */
2309                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2310                                         {
2311                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2312                                         goto err;
2313                                         }
2314                                 }
2315
2316                         /* use the 'p' output buffer for the ECDH key, but
2317                          * make sure to clear it out afterwards
2318                          */
2319
2320                         field_size = EC_GROUP_get_degree(srvr_group);
2321                         if (field_size <= 0)
2322                                 {
2323                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2324                                        ERR_R_ECDH_LIB);
2325                                 goto err;
2326                                 }
2327                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2328                         if (n <= 0)
2329                                 {
2330                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2331                                        ERR_R_ECDH_LIB);
2332                                 goto err;
2333                                 }
2334
2335                         /* generate master key from the result */
2336                         s->session->master_key_length = s->method->ssl3_enc \
2337                             -> generate_master_secret(s, 
2338                                 s->session->master_key,
2339                                 p, n);
2340
2341                         memset(p, 0, n); /* clean up */
2342
2343                         if (ecdh_clnt_cert) 
2344                                 {
2345                                 /* Send empty client key exch message */
2346                                 n = 0;
2347                                 }
2348                         else 
2349                                 {
2350                                 /* First check the size of encoding and
2351                                  * allocate memory accordingly.
2352                                  */
2353                                 encoded_pt_len = 
2354                                     EC_POINT_point2oct(srvr_group, 
2355                                         EC_KEY_get0_public_key(clnt_ecdh), 
2356                                         POINT_CONVERSION_UNCOMPRESSED, 
2357                                         NULL, 0, NULL);
2358
2359                                 encodedPoint = (unsigned char *) 
2360                                     OPENSSL_malloc(encoded_pt_len * 
2361                                         sizeof(unsigned char)); 
2362                                 bn_ctx = BN_CTX_new();
2363                                 if ((encodedPoint == NULL) || 
2364                                     (bn_ctx == NULL)) 
2365                                         {
2366                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2367                                         goto err;
2368                                         }
2369
2370                                 /* Encode the public key */
2371                                 n = EC_POINT_point2oct(srvr_group, 
2372                                     EC_KEY_get0_public_key(clnt_ecdh), 
2373                                     POINT_CONVERSION_UNCOMPRESSED, 
2374                                     encodedPoint, encoded_pt_len, bn_ctx);
2375
2376                                 *p = n; /* length of encoded point */
2377                                 /* Encoded point will be copied here */
2378                                 p += 1; 
2379                                 /* copy the point */
2380                                 memcpy((unsigned char *)p, encodedPoint, n);
2381                                 /* increment n to account for length field */
2382                                 n += 1; 
2383                                 }
2384
2385                         /* Free allocated memory */
2386                         BN_CTX_free(bn_ctx);
2387                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2388                         if (clnt_ecdh != NULL) 
2389                                  EC_KEY_free(clnt_ecdh);
2390                         EVP_PKEY_free(srvr_pub_pkey);
2391                         }
2392 #endif /* !OPENSSL_NO_ECDH */
2393                 else if (alg_k & SSL_kGOST) 
2394                         {
2395                         /* GOST key exchange message creation */
2396                         EVP_PKEY_CTX *pkey_ctx;
2397                         X509 *peer_cert; 
2398                         size_t msglen;
2399                         unsigned int md_len;
2400                         int keytype;
2401                         unsigned char premaster_secret[32],shared_ukm[32];
2402                         EVP_MD_CTX *ukm_hash;
2403                         EVP_PKEY *pub_key;
2404
2405                         /* Get server sertificate PKEY and create ctx from it */
2406                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2407                         if (!peer_cert) 
2408                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2409                         if (!peer_cert)         {
2410                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2411                                         goto err;
2412                                 }       
2413                                 
2414                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2415                         /* If we have send a certificate, and certificate key
2416
2417                          * parameters match those of server certificate, use
2418                          * certificate key for key exchange
2419                          */
2420
2421                          /* Otherwise, generate ephemeral key pair */
2422                                         
2423                         EVP_PKEY_encrypt_init(pkey_ctx);
2424                           /* Generate session key */    
2425                     RAND_bytes(premaster_secret,32);
2426                         /* If we have client certificate, use its secret as peer key */
2427                         if (s->cert->key->privatekey) {
2428                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <0) {
2429                                         /* If there was an error - just ignore it. Ephemeral key
2430                                         * would be used
2431                                         */
2432                                         ERR_clear_error();
2433                                 } else {
2434                                         /* Set flag "client cert key is used for key
2435                                          * exchange"*/
2436                                 }       
2437                         }                       
2438                         /* Compute shared IV and store it in algorithm-specific
2439                          * context data */
2440                         ukm_hash = EVP_MD_CTX_create();
2441                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2442                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2443                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2444                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2445                         EVP_MD_CTX_destroy(ukm_hash);
2446                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2447                                 8,shared_ukm)<0) {
2448                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2449                                                 SSL_R_LIBRARY_BUG);
2450                                         goto err;
2451                                 }       
2452                         /* Make GOST keytransport blob message */
2453                         /*Encapsulate it into sequence */
2454                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2455                         *(p++)=0x81;
2456                         msglen=256;
2457                         if (EVP_PKEY_encrypt(pkey_ctx,(unsigned char *)p+1,&msglen,premaster_secret,32)<0) {
2458                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2459                                         SSL_R_LIBRARY_BUG);
2460                                 goto err;
2461                         }       
2462                         *(p++)= msglen & 0xff;
2463                         n=msglen+3;
2464                         EVP_PKEY_CTX_free(pkey_ctx);
2465                         s->session->master_key_length=
2466                                 s->method->ssl3_enc->generate_master_secret(s,
2467                                         s->session->master_key,premaster_secret,32);
2468                         EVP_PKEY_free(pub_key);
2469
2470                         }
2471 #ifndef OPENSSL_NO_PSK
2472                 else if (alg_k & SSL_kPSK)
2473                         {
2474                         char identity[PSK_MAX_IDENTITY_LEN];
2475                         unsigned char *t = NULL;
2476                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2477                         unsigned int pre_ms_len = 0, psk_len = 0;
2478                         int psk_err = 1;
2479
2480                         n = 0;
2481                         if (s->psk_client_callback == NULL)
2482                                 {
2483                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2484                                         SSL_R_PSK_NO_CLIENT_CB);
2485                                 goto err;
2486                                 }
2487
2488                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2489                                 identity, PSK_MAX_IDENTITY_LEN,
2490                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2491                         if (psk_len > PSK_MAX_PSK_LEN)
2492                                 {
2493                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2494                                         ERR_R_INTERNAL_ERROR);
2495                                 goto psk_err;
2496                                 }
2497                         else if (psk_len == 0)
2498                                 {
2499                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2500                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2501                                 goto psk_err;
2502                                 }
2503
2504                         /* create PSK pre_master_secret */
2505                         pre_ms_len = 2+psk_len+2+psk_len;
2506                         t = psk_or_pre_ms;
2507                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2508                         s2n(psk_len, t);
2509                         memset(t, 0, psk_len);
2510                         t+=psk_len;
2511                         s2n(psk_len, t);
2512
2513                         if (s->session->psk_identity_hint != NULL)
2514                                 OPENSSL_free(s->session->psk_identity_hint);
2515                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2516                         if (s->ctx->psk_identity_hint != NULL &&
2517                                 s->session->psk_identity_hint == NULL)
2518                                 {
2519                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2520                                         ERR_R_MALLOC_FAILURE);
2521                                 goto psk_err;
2522                                 }
2523
2524                         if (s->session->psk_identity != NULL)
2525                                 OPENSSL_free(s->session->psk_identity);
2526                         s->session->psk_identity = BUF_strdup(identity);
2527                         if (s->session->psk_identity == NULL)
2528                                 {
2529                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2530                                         ERR_R_MALLOC_FAILURE);
2531                                 goto psk_err;
2532                                 }
2533
2534                         s->session->master_key_length =
2535                                 s->method->ssl3_enc->generate_master_secret(s,
2536                                         s->session->master_key,
2537                                         psk_or_pre_ms, pre_ms_len); 
2538                         n = strlen(identity);
2539                         s2n(n, p);
2540                         memcpy(p, identity, n);
2541                         n+=2;
2542                         psk_err = 0;
2543                 psk_err:
2544                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2545                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2546                         if (psk_err != 0)
2547                                 {
2548                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2549                                 goto err;
2550                                 }
2551                         }
2552 #endif
2553                 else
2554                         {
2555                         ssl3_send_alert(s, SSL3_AL_FATAL,
2556                             SSL_AD_HANDSHAKE_FAILURE);
2557                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2558                             ERR_R_INTERNAL_ERROR);
2559                         goto err;
2560                         }
2561                 
2562                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2563                 l2n3(n,d);
2564
2565                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2566                 /* number of bytes to write */
2567                 s->init_num=n+4;
2568                 s->init_off=0;
2569                 }
2570
2571         /* SSL3_ST_CW_KEY_EXCH_B */
2572         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2573 err:
2574 #ifndef OPENSSL_NO_ECDH
2575         BN_CTX_free(bn_ctx);
2576         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2577         if (clnt_ecdh != NULL) 
2578                 EC_KEY_free(clnt_ecdh);
2579         EVP_PKEY_free(srvr_pub_pkey);
2580 #endif
2581         return(-1);
2582         }
2583
2584 int ssl3_send_client_verify(SSL *s)
2585         {
2586         unsigned char *p,*d;
2587         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2588         EVP_PKEY *pkey;
2589         EVP_PKEY_CTX *pctx=NULL;
2590 #ifndef OPENSSL_NO_RSA
2591         unsigned u=0;
2592 #endif
2593         unsigned long n;
2594 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2595         int j;
2596 #endif
2597
2598         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2599                 {
2600                 d=(unsigned char *)s->init_buf->data;
2601                 p= &(d[4]);
2602                 pkey=s->cert->key->privatekey;
2603 /* Create context from key and test if sha1 is allowed as digest */
2604                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2605                 EVP_PKEY_sign_init(pctx);
2606                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2607                         {
2608                         s->method->ssl3_enc->cert_verify_mac(s,
2609                                                 NID_sha1,
2610                                                 &(data[MD5_DIGEST_LENGTH]));
2611                         }
2612                 else
2613                         {
2614                         ERR_clear_error();
2615                         }
2616 #ifndef OPENSSL_NO_RSA
2617                 if (pkey->type == EVP_PKEY_RSA)
2618                         {
2619                         s->method->ssl3_enc->cert_verify_mac(s,
2620                                 NID_md5,
2621                                 &(data[0]));
2622                         if (RSA_sign(NID_md5_sha1, data,
2623                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2624                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2625                                 {
2626                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2627                                 goto err;
2628                                 }
2629                         s2n(u,p);
2630                         n=u+2;
2631                         }
2632                 else
2633 #endif
2634 #ifndef OPENSSL_NO_DSA
2635                         if (pkey->type == EVP_PKEY_DSA)
2636                         {
2637                         if (!DSA_sign(pkey->save_type,
2638                                 &(data[MD5_DIGEST_LENGTH]),
2639                                 SHA_DIGEST_LENGTH,&(p[2]),
2640                                 (unsigned int *)&j,pkey->pkey.dsa))
2641                                 {
2642                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2643                                 goto err;
2644                                 }
2645                         s2n(j,p);
2646                         n=j+2;
2647                         }
2648                 else
2649 #endif
2650 #ifndef OPENSSL_NO_ECDSA
2651                         if (pkey->type == EVP_PKEY_EC)
2652                         {
2653                         if (!ECDSA_sign(pkey->save_type,
2654                                 &(data[MD5_DIGEST_LENGTH]),
2655                                 SHA_DIGEST_LENGTH,&(p[2]),
2656                                 (unsigned int *)&j,pkey->pkey.ec))
2657                                 {
2658                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2659                                     ERR_R_ECDSA_LIB);
2660                                 goto err;
2661                                 }
2662                         s2n(j,p);
2663                         n=j+2;
2664                         }
2665                 else
2666 #endif
2667                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001) 
2668                 {
2669                 unsigned char signbuf[64];
2670                 int i;
2671                 size_t sigsize=64;
2672                 s->method->ssl3_enc->cert_verify_mac(s,
2673                         NID_id_GostR3411_94,
2674                         data);
2675                 if (!EVP_PKEY_sign(pctx,signbuf,&sigsize,data,32)) {
2676                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2677                         ERR_R_INTERNAL_ERROR);
2678                         goto err;
2679                 }
2680                 for (i=63,j=0; i>=0; j++, i--) {
2681                         p[2+j]=signbuf[i];
2682                 }       
2683                 s2n(j,p);
2684                 n=j+2;
2685                 }
2686                 else
2687                 {
2688                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2689                         goto err;
2690                 }
2691                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2692                 l2n3(n,d);
2693
2694                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2695                 s->init_num=(int)n+4;
2696                 s->init_off=0;
2697                 }
2698         EVP_PKEY_CTX_free(pctx);
2699         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2700 err:
2701         EVP_PKEY_CTX_free(pctx);
2702         return(-1);
2703         }
2704
2705 int ssl3_send_client_certificate(SSL *s)
2706         {
2707         X509 *x509=NULL;
2708         EVP_PKEY *pkey=NULL;
2709         int i;
2710         unsigned long l;
2711
2712         if (s->state == SSL3_ST_CW_CERT_A)
2713                 {
2714                 if ((s->cert == NULL) ||
2715                         (s->cert->key->x509 == NULL) ||
2716                         (s->cert->key->privatekey == NULL))
2717                         s->state=SSL3_ST_CW_CERT_B;
2718                 else
2719                         s->state=SSL3_ST_CW_CERT_C;
2720                 }
2721
2722         /* We need to get a client cert */
2723         if (s->state == SSL3_ST_CW_CERT_B)
2724                 {
2725                 /* If we get an error, we need to
2726                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2727                  * We then get retied later */
2728                 i=0;
2729                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2730                 if (i < 0)
2731                         {
2732                         s->rwstate=SSL_X509_LOOKUP;
2733                         return(-1);
2734                         }
2735                 s->rwstate=SSL_NOTHING;
2736                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2737                         {
2738                         s->state=SSL3_ST_CW_CERT_B;
2739                         if (    !SSL_use_certificate(s,x509) ||
2740                                 !SSL_use_PrivateKey(s,pkey))
2741                                 i=0;
2742                         }
2743                 else if (i == 1)
2744                         {
2745                         i=0;
2746                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2747                         }
2748
2749                 if (x509 != NULL) X509_free(x509);
2750                 if (pkey != NULL) EVP_PKEY_free(pkey);
2751                 if (i == 0)
2752                         {
2753                         if (s->version == SSL3_VERSION)
2754                                 {
2755                                 s->s3->tmp.cert_req=0;
2756                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2757                                 return(1);
2758                                 }
2759                         else
2760                                 {
2761                                 s->s3->tmp.cert_req=2;
2762                                 }
2763                         }
2764
2765                 /* Ok, we have a cert */
2766                 s->state=SSL3_ST_CW_CERT_C;
2767                 }
2768
2769         if (s->state == SSL3_ST_CW_CERT_C)
2770                 {
2771                 s->state=SSL3_ST_CW_CERT_D;
2772                 l=ssl3_output_cert_chain(s,
2773                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2774                 s->init_num=(int)l;
2775                 s->init_off=0;
2776                 }
2777         /* SSL3_ST_CW_CERT_D */
2778         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2779         }
2780
2781 #define has_bits(i,m)   (((i)&(m)) == (m))
2782
2783 int ssl3_check_cert_and_algorithm(SSL *s)
2784         {
2785         int i,idx;
2786         long alg_k,alg_a;
2787         EVP_PKEY *pkey=NULL;
2788         SESS_CERT *sc;
2789 #ifndef OPENSSL_NO_RSA
2790         RSA *rsa;
2791 #endif
2792 #ifndef OPENSSL_NO_DH
2793         DH *dh;
2794 #endif
2795
2796         sc=s->session->sess_cert;
2797         if (sc == NULL)
2798                 {
2799                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2800                 goto err;
2801                 }
2802
2803         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2804         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2805
2806         /* we don't have a certificate */
2807         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2808                 return(1);
2809
2810 #ifndef OPENSSL_NO_RSA
2811         rsa=s->session->sess_cert->peer_rsa_tmp;
2812 #endif
2813 #ifndef OPENSSL_NO_DH
2814         dh=s->session->sess_cert->peer_dh_tmp;
2815 #endif
2816
2817         /* This is the passed certificate */
2818
2819         idx=sc->peer_cert_type;
2820 #ifndef OPENSSL_NO_ECDH
2821         if (idx == SSL_PKEY_ECC)
2822                 {
2823                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2824                     s->s3->tmp.new_cipher) == 0) 
2825                         { /* check failed */
2826                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2827                         goto f_err;
2828                         }
2829                 else 
2830                         {
2831                         return 1;
2832                         }
2833                 }
2834 #endif
2835         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2836         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2837         EVP_PKEY_free(pkey);
2838
2839         
2840         /* Check that we have a certificate if we require one */
2841         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2842                 {
2843                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2844                 goto f_err;
2845                 }
2846 #ifndef OPENSSL_NO_DSA
2847         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2848                 {
2849                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2850                 goto f_err;
2851                 }
2852 #endif
2853 #ifndef OPENSSL_NO_RSA
2854         if ((alg_k & SSL_kRSA) &&
2855                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2856                 {
2857                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2858                 goto f_err;
2859                 }
2860 #endif
2861 #ifndef OPENSSL_NO_DH
2862         if ((alg_k & SSL_kEDH) &&
2863                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2864                 {
2865                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2866                 goto f_err;
2867                 }
2868         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2869                 {
2870                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2871                 goto f_err;
2872                 }
2873 #ifndef OPENSSL_NO_DSA
2874         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2875                 {
2876                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2877                 goto f_err;
2878                 }
2879 #endif
2880 #endif
2881
2882         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2883                 {
2884 #ifndef OPENSSL_NO_RSA
2885                 if (alg_k & SSL_kRSA)
2886                         {
2887                         if (rsa == NULL
2888                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2889                                 {
2890                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2891                                 goto f_err;
2892                                 }
2893                         }
2894                 else
2895 #endif
2896 #ifndef OPENSSL_NO_DH
2897                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2898                             {
2899                             if (dh == NULL
2900                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2901                                 {
2902                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2903                                 goto f_err;
2904                                 }
2905                         }
2906                 else
2907 #endif
2908                         {
2909                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2910                         goto f_err;
2911                         }
2912                 }
2913         return(1);
2914 f_err:
2915         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2916 err:
2917         return(0);
2918         }
2919
2920 /* Check to see if handshake is full or resumed. Usually this is just a
2921  * case of checking to see if a cache hit has occurred. In the case of
2922  * session tickets we have to check the next message to be sure.
2923  */
2924
2925 #ifndef OPENSSL_NO_TLSEXT
2926 static int ssl3_check_finished(SSL *s)
2927         {
2928         int ok;
2929         long n;
2930         /* If we have no ticket or session ID is non-zero length (a match of
2931          * a non-zero session length would never reach here) it cannot be a
2932          * resumed session.
2933          */
2934         if (!s->session->tlsext_tick || s->session->session_id_length)
2935                 return 1;
2936         /* this function is called when we really expect a Certificate
2937          * message, so permit appropriate message length */
2938         n=s->method->ssl_get_message(s,
2939                 SSL3_ST_CR_CERT_A,
2940                 SSL3_ST_CR_CERT_B,
2941                 -1,
2942                 s->max_cert_list,
2943                 &ok);
2944         if (!ok) return((int)n);
2945         s->s3->tmp.reuse_message = 1;
2946         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2947                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2948                 return 2;
2949
2950         return 1;
2951         }
2952 #endif
2953
2954 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2955         {
2956         int i = 0;
2957 #ifndef OPENSSL_NO_ENGINE
2958         if (s->ctx->client_cert_engine)
2959                 {
2960                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
2961                                                 SSL_get_client_CA_list(s),
2962                                                 px509, ppkey, NULL, NULL, NULL);
2963                 if (i != 0)
2964                         return i;
2965                 }
2966 #endif
2967         if (s->ctx->client_cert_cb)
2968                 i = s->ctx->client_cert_cb(s,px509,ppkey);
2969         return i;
2970         }