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[openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #include <stdio.h>
152 #include "ssl_locl.h"
153 #include "kssl_lcl.h"
154 #include <openssl/buffer.h>
155 #include <openssl/rand.h>
156 #include <openssl/objects.h>
157 #include <openssl/evp.h>
158 #include <openssl/md5.h>
159 #ifdef OPENSSL_FIPS
160 #include <openssl/fips.h>
161 #endif
162 #ifndef OPENSSL_NO_DH
163 #include <openssl/dh.h>
164 #endif
165 #include <openssl/bn.h>
166 #ifndef OPENSSL_NO_ENGINE
167 #include <openssl/engine.h>
168 #endif
169
170 static const SSL_METHOD *ssl3_get_client_method(int ver);
171 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
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         void (*cb)(const SSL *ssl,int type,int val)=NULL;
191         int ret= -1;
192         int new_state,state,skip=0;
193
194         RAND_add(&Time,sizeof(Time),0);
195         ERR_clear_error();
196         clear_sys_error();
197
198         if (s->info_callback != NULL)
199                 cb=s->info_callback;
200         else if (s->ctx->info_callback != NULL)
201                 cb=s->ctx->info_callback;
202         
203         s->in_handshake++;
204         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
205
206 #ifndef OPENSSL_NO_HEARTBEATS
207         /* If we're awaiting a HeartbeatResponse, pretend we
208          * already got and don't await it anymore, because
209          * Heartbeats don't make sense during handshakes anyway.
210          */
211         if (s->tlsext_hb_pending)
212                 {
213                 s->tlsext_hb_pending = 0;
214                 s->tlsext_hb_seq++;
215                 }
216 #endif
217
218         for (;;)
219                 {
220                 state=s->state;
221
222                 switch(s->state)
223                         {
224                 case SSL_ST_RENEGOTIATE:
225                         s->renegotiate=1;
226                         s->state=SSL_ST_CONNECT;
227                         s->ctx->stats.sess_connect_renegotiate++;
228                         /* break */
229                 case SSL_ST_BEFORE:
230                 case SSL_ST_CONNECT:
231                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
232                 case SSL_ST_OK|SSL_ST_CONNECT:
233
234                         s->server=0;
235                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
236
237                         if ((s->version & 0xff00 ) != 0x0300)
238                                 {
239                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
240                                 ret = -1;
241                                 goto end;
242                                 }
243
244                         if (!ssl_security(s, SSL_SECOP_VERSION, 0,
245                                                         s->version, NULL))
246                                 {
247                                 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
248                                 return -1;
249                                 }
250                                 
251                         /* s->version=SSL3_VERSION; */
252                         s->type=SSL_ST_CONNECT;
253
254                         if (s->init_buf == NULL)
255                                 {
256                                 if ((buf=BUF_MEM_new()) == NULL)
257                                         {
258                                         ret= -1;
259                                         goto end;
260                                         }
261                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
262                                         {
263                                         ret= -1;
264                                         goto end;
265                                         }
266                                 s->init_buf=buf;
267                                 buf=NULL;
268                                 }
269
270                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
271
272                         /* setup buffing BIO */
273                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
274
275                         /* don't push the buffering BIO quite yet */
276
277                         ssl3_init_finished_mac(s);
278
279                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
280                         s->ctx->stats.sess_connect++;
281                         s->init_num=0;
282                         break;
283
284                 case SSL3_ST_CW_CLNT_HELLO_A:
285                 case SSL3_ST_CW_CLNT_HELLO_B:
286
287                         s->shutdown=0;
288                         ret=ssl3_client_hello(s);
289                         if (ret <= 0) goto end;
290                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
291                         s->init_num=0;
292
293                         /* turn on buffering for the next lot of output */
294                         if (s->bbio != s->wbio)
295                                 s->wbio=BIO_push(s->bbio,s->wbio);
296
297                         break;
298
299                 case SSL3_ST_CR_SRVR_HELLO_A:
300                 case SSL3_ST_CR_SRVR_HELLO_B:
301                         ret=ssl3_get_server_hello(s);
302                         if (ret <= 0) goto end;
303
304                         if (s->hit)
305                                 {
306                                 s->state=SSL3_ST_CR_FINISHED_A;
307 #ifndef OPENSSL_NO_TLSEXT
308                                 if (s->tlsext_ticket_expected)
309                                         {
310                                         /* receive renewed session ticket */
311                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
312                                         }
313 #endif
314                                 }
315                         else
316                                 {
317                                         s->state=SSL3_ST_CR_CERT_A;
318                                 }
319                         s->init_num=0;
320                         break;
321 #ifndef OPENSSL_NO_TLSEXT
322                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_A:
323                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_B:
324                         ret = tls1_get_server_supplemental_data(s);
325                         if (ret <= 0) goto end;
326                         s->state=SSL3_ST_CR_CERT_A;
327                         s->init_num = 0;
328                         break;
329 #endif
330                 case SSL3_ST_CR_CERT_A:
331                 case SSL3_ST_CR_CERT_B:
332 #ifndef OPENSSL_NO_TLSEXT
333                         ret=ssl3_check_finished(s);
334                         if (ret <= 0) goto end;
335                         if (ret == 3)
336                                 {
337                                 s->state=SSL3_ST_CR_SUPPLEMENTAL_DATA_A;
338                                 s->init_num=0;
339                                 break;
340                                 }
341                         if (ret == 2)
342                                 {
343                                 s->hit = 1;
344                                 if (s->tlsext_ticket_expected)
345                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
346                                 else
347                                         s->state=SSL3_ST_CR_FINISHED_A;
348                                 s->init_num=0;
349                                 break;
350                                 }
351 #endif
352                         /* Check if it is anon DH/ECDH */
353                         /* or PSK */
354                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
355                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
356                                 {
357                                 ret=ssl3_get_server_certificate(s);
358                                 if (ret <= 0) goto end;
359 #ifndef OPENSSL_NO_TLSEXT
360                                 if (s->tlsext_status_expected)
361                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
362                                 else
363                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
364                                 }
365                         else
366                                 {
367                                 skip = 1;
368                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
369                                 }
370 #else
371                                 }
372                         else
373                                 skip=1;
374
375                         s->state=SSL3_ST_CR_KEY_EXCH_A;
376 #endif
377                         s->init_num=0;
378                         break;
379
380                 case SSL3_ST_CR_KEY_EXCH_A:
381                 case SSL3_ST_CR_KEY_EXCH_B:
382                         ret=ssl3_get_key_exchange(s);
383                         if (ret <= 0) goto end;
384                         s->state=SSL3_ST_CR_CERT_REQ_A;
385                         s->init_num=0;
386
387                         /* at this point we check that we have the
388                          * required stuff from the server */
389                         if (!ssl3_check_cert_and_algorithm(s))
390                                 {
391                                 ret= -1;
392                                 goto end;
393                                 }
394                         break;
395
396                 case SSL3_ST_CR_CERT_REQ_A:
397                 case SSL3_ST_CR_CERT_REQ_B:
398                         ret=ssl3_get_certificate_request(s);
399                         if (ret <= 0) goto end;
400                         s->state=SSL3_ST_CR_SRVR_DONE_A;
401                         s->init_num=0;
402                         break;
403
404                 case SSL3_ST_CR_SRVR_DONE_A:
405                 case SSL3_ST_CR_SRVR_DONE_B:
406                         ret=ssl3_get_server_done(s);
407                         if (ret <= 0) goto end;
408 #ifndef OPENSSL_NO_SRP
409                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
410                                 {
411                                 if ((ret = SRP_Calc_A_param(s))<=0)
412                                         {
413                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
414                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
415                                         goto end;
416                                         }
417                                 }
418 #endif
419 #ifndef OPENSSL_NO_TLSEXT
420                         s->state=SSL3_ST_CW_SUPPLEMENTAL_DATA_A;
421 #else
422                         if (s->s3->tmp.cert_req)
423                                 s->state=SSL3_ST_CW_CERT_A;
424                         else
425                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
426 #endif
427                         s->init_num=0;
428
429                         break;
430
431                 case SSL3_ST_CW_CERT_A:
432                 case SSL3_ST_CW_CERT_B:
433                 case SSL3_ST_CW_CERT_C:
434                 case SSL3_ST_CW_CERT_D:
435                         ret=ssl3_send_client_certificate(s);
436                         if (ret <= 0) goto end;
437                         s->state=SSL3_ST_CW_KEY_EXCH_A;
438                         s->init_num=0;
439                         break;
440
441                 case SSL3_ST_CW_KEY_EXCH_A:
442                 case SSL3_ST_CW_KEY_EXCH_B:
443                         ret=ssl3_send_client_key_exchange(s);
444                         if (ret <= 0) goto end;
445                         /* EAY EAY EAY need to check for DH fix cert
446                          * sent back */
447                         /* For TLS, cert_req is set to 2, so a cert chain
448                          * of nothing is sent, but no verify packet is sent */
449                         /* XXX: For now, we do not support client 
450                          * authentication in ECDH cipher suites with
451                          * ECDH (rather than ECDSA) certificates.
452                          * We need to skip the certificate verify 
453                          * message when client's ECDH public key is sent 
454                          * inside the client certificate.
455                          */
456                         if (s->s3->tmp.cert_req == 1)
457                                 {
458                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
459                                 }
460                         else
461                                 {
462                                 s->state=SSL3_ST_CW_CHANGE_A;
463                                 s->s3->change_cipher_spec=0;
464                                 }
465                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
466                                 {
467                                 s->state=SSL3_ST_CW_CHANGE_A;
468                                 s->s3->change_cipher_spec=0;
469                                 }
470
471                         s->init_num=0;
472                         break;
473
474                 case SSL3_ST_CW_CERT_VRFY_A:
475                 case SSL3_ST_CW_CERT_VRFY_B:
476                         ret=ssl3_send_client_verify(s);
477                         if (ret <= 0) goto end;
478                         s->state=SSL3_ST_CW_CHANGE_A;
479                         s->init_num=0;
480                         s->s3->change_cipher_spec=0;
481                         break;
482
483                 case SSL3_ST_CW_CHANGE_A:
484                 case SSL3_ST_CW_CHANGE_B:
485                         ret=ssl3_send_change_cipher_spec(s,
486                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
487                         if (ret <= 0) goto end;
488
489 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
490                         s->state=SSL3_ST_CW_FINISHED_A;
491 #else
492                         if (s->s3->next_proto_neg_seen)
493                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
494                         else
495                                 s->state=SSL3_ST_CW_FINISHED_A;
496 #endif
497                         s->init_num=0;
498
499                         s->session->cipher=s->s3->tmp.new_cipher;
500 #ifdef OPENSSL_NO_COMP
501                         s->session->compress_meth=0;
502 #else
503                         if (s->s3->tmp.new_compression == NULL)
504                                 s->session->compress_meth=0;
505                         else
506                                 s->session->compress_meth=
507                                         s->s3->tmp.new_compression->id;
508 #endif
509                         if (!s->method->ssl3_enc->setup_key_block(s))
510                                 {
511                                 ret= -1;
512                                 goto end;
513                                 }
514
515                         if (!s->method->ssl3_enc->change_cipher_state(s,
516                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
517                                 {
518                                 ret= -1;
519                                 goto end;
520                                 }
521
522                         break;
523
524 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
525                 case SSL3_ST_CW_NEXT_PROTO_A:
526                 case SSL3_ST_CW_NEXT_PROTO_B:
527                         ret=ssl3_send_next_proto(s);
528                         if (ret <= 0) goto end;
529                         s->state=SSL3_ST_CW_FINISHED_A;
530                         break;
531 #endif
532
533 #ifndef OPENSSL_NO_TLSEXT
534                 case SSL3_ST_CW_SUPPLEMENTAL_DATA_A:
535                 case SSL3_ST_CW_SUPPLEMENTAL_DATA_B:
536                         ret = tls1_send_client_supplemental_data(s, &skip);
537                         if (ret <= 0) goto end;
538                         if (s->s3->tmp.cert_req)
539                                 s->state=SSL3_ST_CW_CERT_A;
540                         else
541                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
542                         s->init_num=0;
543                         break;
544 #endif
545
546                 case SSL3_ST_CW_FINISHED_A:
547                 case SSL3_ST_CW_FINISHED_B:
548                         ret=ssl3_send_finished(s,
549                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
550                                 s->method->ssl3_enc->client_finished_label,
551                                 s->method->ssl3_enc->client_finished_label_len);
552                         if (ret <= 0) goto end;
553                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
554                         s->state=SSL3_ST_CW_FLUSH;
555
556                         /* clear flags */
557                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
558                         if (s->hit)
559                                 {
560                                 s->s3->tmp.next_state=SSL_ST_OK;
561                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
562                                         {
563                                         s->state=SSL_ST_OK;
564                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
565                                         s->s3->delay_buf_pop_ret=0;
566                                         }
567                                 }
568                         else
569                                 {
570 #ifndef OPENSSL_NO_TLSEXT
571                                 /* Allow NewSessionTicket if ticket expected */
572                                 if (s->tlsext_ticket_expected)
573                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
574                                 else
575 #endif
576                                 
577                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
578                                 }
579                         s->init_num=0;
580                         break;
581
582 #ifndef OPENSSL_NO_TLSEXT
583                 case SSL3_ST_CR_SESSION_TICKET_A:
584                 case SSL3_ST_CR_SESSION_TICKET_B:
585                         ret=ssl3_get_new_session_ticket(s);
586                         if (ret <= 0) goto end;
587                         s->state=SSL3_ST_CR_FINISHED_A;
588                         s->init_num=0;
589                 break;
590
591                 case SSL3_ST_CR_CERT_STATUS_A:
592                 case SSL3_ST_CR_CERT_STATUS_B:
593                         ret=ssl3_get_cert_status(s);
594                         if (ret <= 0) goto end;
595                         s->state=SSL3_ST_CR_KEY_EXCH_A;
596                         s->init_num=0;
597                 break;
598 #endif
599
600                 case SSL3_ST_CR_FINISHED_A:
601                 case SSL3_ST_CR_FINISHED_B:
602
603                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
604                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
605                                 SSL3_ST_CR_FINISHED_B);
606                         if (ret <= 0) goto end;
607
608                         if (s->hit)
609                                 s->state=SSL3_ST_CW_CHANGE_A;
610                         else
611                                 s->state=SSL_ST_OK;
612                         s->init_num=0;
613                         break;
614
615                 case SSL3_ST_CW_FLUSH:
616                         s->rwstate=SSL_WRITING;
617                         if (BIO_flush(s->wbio) <= 0)
618                                 {
619                                 ret= -1;
620                                 goto end;
621                                 }
622                         s->rwstate=SSL_NOTHING;
623                         s->state=s->s3->tmp.next_state;
624                         break;
625
626                 case SSL_ST_OK:
627                         /* clean a few things up */
628                         ssl3_cleanup_key_block(s);
629
630                         if (s->init_buf != NULL)
631                                 {
632                                 BUF_MEM_free(s->init_buf);
633                                 s->init_buf=NULL;
634                                 }
635
636                         /* If we are not 'joining' the last two packets,
637                          * remove the buffering now */
638                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
639                                 ssl_free_wbio_buffer(s);
640                         /* else do it later in ssl3_write */
641
642                         s->init_num=0;
643                         s->renegotiate=0;
644                         s->new_session=0;
645
646                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
647                         if (s->hit) s->ctx->stats.sess_hit++;
648
649                         ret=1;
650                         /* s->server=0; */
651                         s->handshake_func=ssl3_connect;
652                         s->ctx->stats.sess_connect_good++;
653
654                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
655
656                         goto end;
657                         /* break; */
658                         
659                 default:
660                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
661                         ret= -1;
662                         goto end;
663                         /* break; */
664                         }
665
666                 /* did we do anything */
667                 if (!s->s3->tmp.reuse_message && !skip)
668                         {
669                         if (s->debug)
670                                 {
671                                 if ((ret=BIO_flush(s->wbio)) <= 0)
672                                         goto end;
673                                 }
674
675                         if ((cb != NULL) && (s->state != state))
676                                 {
677                                 new_state=s->state;
678                                 s->state=state;
679                                 cb(s,SSL_CB_CONNECT_LOOP,1);
680                                 s->state=new_state;
681                                 }
682                         }
683                 skip=0;
684                 }
685 end:
686         s->in_handshake--;
687         if (buf != NULL)
688                 BUF_MEM_free(buf);
689         if (cb != NULL)
690                 cb(s,SSL_CB_CONNECT_EXIT,ret);
691         return(ret);
692         }
693
694
695 int ssl3_client_hello(SSL *s)
696         {
697         unsigned char *buf;
698         unsigned char *p,*d;
699         int i;
700         unsigned long l;
701         int al = 0;
702 #ifndef OPENSSL_NO_COMP
703         int j;
704         SSL_COMP *comp;
705 #endif
706
707         buf=(unsigned char *)s->init_buf->data;
708         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
709                 {
710                 SSL_SESSION *sess = s->session;
711                 if ((sess == NULL) ||
712                         (sess->ssl_version != s->version) ||
713 #ifdef OPENSSL_NO_TLSEXT
714                         !sess->session_id_length ||
715 #else
716                         (!sess->session_id_length && !sess->tlsext_tick) ||
717 #endif
718                         (sess->not_resumable))
719                         {
720                         if (!ssl_get_new_session(s,0))
721                                 goto err;
722                         }
723                 if (s->method->version == DTLS_ANY_VERSION)
724                         {
725                         /* Determine which DTLS version to use */
726                         int options = s->options;
727                         /* If DTLS 1.2 disabled correct the version number */
728                         if (options & SSL_OP_NO_DTLSv1_2)
729                                 {
730                                 if (tls1_suiteb(s))
731                                         {
732                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
733                                         goto err;
734                                         }
735                                 /* Disabling all versions is silly: return an
736                                  * error.
737                                  */
738                                 if (options & SSL_OP_NO_DTLSv1)
739                                         {
740                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
741                                         goto err;
742                                         }
743                                 /* Update method so we don't use any DTLS 1.2
744                                  * features.
745                                  */
746                                 s->method = DTLSv1_client_method();
747                                 s->version = DTLS1_VERSION;
748                                 }
749                         else
750                                 {
751                                 /* We only support one version: update method */
752                                 if (options & SSL_OP_NO_DTLSv1)
753                                         s->method = DTLSv1_2_client_method();
754                                 s->version = DTLS1_2_VERSION;
755                                 }
756                         s->client_version = s->version;
757                         }
758                 /* else use the pre-loaded session */
759
760                 p=s->s3->client_random;
761
762                 /* for DTLS if client_random is initialized, reuse it, we are
763                  * required to use same upon reply to HelloVerify */
764                 if (SSL_IS_DTLS(s))
765                         {
766                         size_t idx;
767                         i = 1;
768                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
769                                 {
770                                 if (p[idx])
771                                         {
772                                         i = 0;
773                                         break;
774                                         }
775                                 }
776                         }
777                 else 
778                         i = 1;
779
780                 if (i)
781                         ssl_fill_hello_random(s, 0, p,
782                                               sizeof(s->s3->client_random));
783
784                 /* Do the message type and length last */
785                 d=p= ssl_handshake_start(s);
786
787                 /* version indicates the negotiated version: for example from
788                  * an SSLv2/v3 compatible client hello). The client_version
789                  * field is the maximum version we permit and it is also
790                  * used in RSA encrypted premaster secrets. Some servers can
791                  * choke if we initially report a higher version then
792                  * renegotiate to a lower one in the premaster secret. This
793                  * didn't happen with TLS 1.0 as most servers supported it
794                  * but it can with TLS 1.1 or later if the server only supports
795                  * 1.0.
796                  *
797                  * Possible scenario with previous logic:
798                  *      1. Client hello indicates TLS 1.2
799                  *      2. Server hello says TLS 1.0
800                  *      3. RSA encrypted premaster secret uses 1.2.
801                  *      4. Handhaked proceeds using TLS 1.0.
802                  *      5. Server sends hello request to renegotiate.
803                  *      6. Client hello indicates TLS v1.0 as we now
804                  *         know that is maximum server supports.
805                  *      7. Server chokes on RSA encrypted premaster secret
806                  *         containing version 1.0.
807                  *
808                  * For interoperability it should be OK to always use the
809                  * maximum version we support in client hello and then rely
810                  * on the checking of version to ensure the servers isn't
811                  * being inconsistent: for example initially negotiating with
812                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
813                  * client_version in client hello and not resetting it to
814                  * the negotiated version.
815                  */
816 #if 0
817                 *(p++)=s->version>>8;
818                 *(p++)=s->version&0xff;
819                 s->client_version=s->version;
820 #else
821                 *(p++)=s->client_version>>8;
822                 *(p++)=s->client_version&0xff;
823 #endif
824
825                 /* Random stuff */
826                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
827                 p+=SSL3_RANDOM_SIZE;
828
829                 /* Session ID */
830                 if (s->new_session)
831                         i=0;
832                 else
833                         i=s->session->session_id_length;
834                 *(p++)=i;
835                 if (i != 0)
836                         {
837                         if (i > (int)sizeof(s->session->session_id))
838                                 {
839                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
840                                 goto err;
841                                 }
842                         memcpy(p,s->session->session_id,i);
843                         p+=i;
844                         }
845                 
846                 /* cookie stuff for DTLS */
847                 if (SSL_IS_DTLS(s))
848                         {
849                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
850                                 {
851                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
852                                 goto err;
853                                 }
854                         *(p++) = s->d1->cookie_len;
855                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
856                         p += s->d1->cookie_len;
857                         }
858                 
859                 /* Ciphers supported */
860                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
861                 if (i == 0)
862                         {
863                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
864                         goto err;
865                         }
866 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
867                         /* Some servers hang if client hello > 256 bytes
868                          * as hack workaround chop number of supported ciphers
869                          * to keep it well below this if we use TLS v1.2
870                          */
871                         if (TLS1_get_version(s) >= TLS1_2_VERSION
872                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
873                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
874 #endif
875                 s2n(i,p);
876                 p+=i;
877
878                 /* COMPRESSION */
879 #ifdef OPENSSL_NO_COMP
880                 *(p++)=1;
881 #else
882
883                 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
884                         j=0;
885                 else
886                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
887                 *(p++)=1+j;
888                 for (i=0; i<j; i++)
889                         {
890                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
891                         *(p++)=comp->id;
892                         }
893 #endif
894                 *(p++)=0; /* Add the NULL method */
895
896 #ifndef OPENSSL_NO_TLSEXT
897                 /* TLS extensions*/
898                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
899                         {
900                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
901                         goto err;
902                         }
903                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
904                         {
905                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
906                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
907                         goto err;
908                         }
909 #endif
910                 
911                 l= p-d;
912                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
913                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
914                 }
915
916         /* SSL3_ST_CW_CLNT_HELLO_B */
917         return ssl_do_write(s);
918 err:
919         return(-1);
920         }
921
922 int ssl3_get_server_hello(SSL *s)
923         {
924         STACK_OF(SSL_CIPHER) *sk;
925         const SSL_CIPHER *c;
926         CERT *ct = s->cert;
927         unsigned char *p,*d;
928         int i,al=SSL_AD_INTERNAL_ERROR,ok;
929         unsigned int j;
930         long n;
931 #ifndef OPENSSL_NO_COMP
932         SSL_COMP *comp;
933 #endif
934         /* Hello verify request and/or server hello version may not
935          * match so set first packet if we're negotiating version.
936          */
937         if (SSL_IS_DTLS(s))
938                 s->first_packet = 1;
939
940         n=s->method->ssl_get_message(s,
941                 SSL3_ST_CR_SRVR_HELLO_A,
942                 SSL3_ST_CR_SRVR_HELLO_B,
943                 -1,
944                 20000, /* ?? */
945                 &ok);
946
947         if (!ok) return((int)n);
948
949         if (SSL_IS_DTLS(s))
950                 {
951                 s->first_packet = 0;
952                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
953                         {
954                         if ( s->d1->send_cookie == 0)
955                                 {
956                                 s->s3->tmp.reuse_message = 1;
957                                 return 1;
958                                 }
959                         else /* already sent a cookie */
960                                 {
961                                 al=SSL_AD_UNEXPECTED_MESSAGE;
962                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
963                                 goto f_err;
964                                 }
965                         }
966                 }
967         
968         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
969                 {
970                 al=SSL_AD_UNEXPECTED_MESSAGE;
971                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
972                 goto f_err;
973                 }
974
975         d=p=(unsigned char *)s->init_msg;
976         if (s->method->version == DTLS_ANY_VERSION)
977                 {
978                 /* Work out correct protocol version to use */
979                 int hversion = (p[0] << 8)|p[1];
980                 int options = s->options;
981                 if (hversion == DTLS1_2_VERSION
982                         && !(options & SSL_OP_NO_DTLSv1_2))
983                         s->method = DTLSv1_2_client_method();
984                 else if (tls1_suiteb(s))
985                         {
986                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
987                         s->version = hversion;
988                         al = SSL_AD_PROTOCOL_VERSION;
989                         goto f_err;
990                         }
991                 else if (hversion == DTLS1_VERSION
992                         && !(options & SSL_OP_NO_DTLSv1))
993                         s->method = DTLSv1_client_method();
994                 else
995                         {
996                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
997                         s->version = hversion;
998                         al = SSL_AD_PROTOCOL_VERSION;
999                         goto f_err;
1000                         }
1001                 s->version = s->client_version = s->method->version;
1002                 }
1003
1004         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
1005                 {
1006                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
1007                 s->version=(s->version&0xff00)|p[1];
1008                 al=SSL_AD_PROTOCOL_VERSION;
1009                 goto f_err;
1010                 }
1011         p+=2;
1012
1013         /* load the server hello data */
1014         /* load the server random */
1015         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
1016         p+=SSL3_RANDOM_SIZE;
1017
1018         /* get the session-id */
1019         j= *(p++);
1020
1021         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
1022                 {
1023                 al=SSL_AD_ILLEGAL_PARAMETER;
1024                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
1025                 goto f_err;
1026                 }
1027
1028 #ifndef OPENSSL_NO_TLSEXT
1029         /* check if we want to resume the session based on external pre-shared secret */
1030         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1031                 {
1032                 SSL_CIPHER *pref_cipher=NULL;
1033                 s->session->master_key_length=sizeof(s->session->master_key);
1034                 if (s->tls_session_secret_cb(s, s->session->master_key,
1035                                              &s->session->master_key_length,
1036                                              NULL, &pref_cipher,
1037                                              s->tls_session_secret_cb_arg))
1038                         {
1039                         s->session->cipher = pref_cipher ?
1040                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
1041                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
1042                         }
1043                 }
1044 #endif /* OPENSSL_NO_TLSEXT */
1045
1046         if (j != 0 && j == s->session->session_id_length
1047             && memcmp(p,s->session->session_id,j) == 0)
1048             {
1049             if(s->sid_ctx_length != s->session->sid_ctx_length
1050                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
1051                 {
1052                 /* actually a client application bug */
1053                 al=SSL_AD_ILLEGAL_PARAMETER;
1054                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1055                 goto f_err;
1056                 }
1057             s->s3->flags |= SSL3_FLAGS_CCS_OK;
1058             s->hit=1;
1059             }
1060         else    /* a miss or crap from the other end */
1061                 {
1062                 /* If we were trying for session-id reuse, make a new
1063                  * SSL_SESSION so we don't stuff up other people */
1064                 s->hit=0;
1065                 if (s->session->session_id_length > 0)
1066                         {
1067                         if (!ssl_get_new_session(s,0))
1068                                 {
1069                                 goto f_err;
1070                                 }
1071                         }
1072                 s->session->session_id_length=j;
1073                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1074                 }
1075         p+=j;
1076         c=ssl_get_cipher_by_char(s,p);
1077         if (c == NULL)
1078                 {
1079                 /* unknown cipher */
1080                 al=SSL_AD_ILLEGAL_PARAMETER;
1081                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1082                 goto f_err;
1083                 }
1084         /* Set version disabled mask now we know version */
1085         if (!SSL_USE_TLS1_2_CIPHERS(s))
1086                 ct->mask_ssl = SSL_TLSV1_2;
1087         else
1088                 ct->mask_ssl = 0;
1089         /* If it is a disabled cipher we didn't send it in client hello,
1090          * so return an error.
1091          */
1092         if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK))
1093                 {
1094                 al=SSL_AD_ILLEGAL_PARAMETER;
1095                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1096                 goto f_err;
1097                 }
1098         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1099
1100         sk=ssl_get_ciphers_by_id(s);
1101         i=sk_SSL_CIPHER_find(sk,c);
1102         if (i < 0)
1103                 {
1104                 /* we did not say we would use this cipher */
1105                 al=SSL_AD_ILLEGAL_PARAMETER;
1106                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1107                 goto f_err;
1108                 }
1109
1110         /* Depending on the session caching (internal/external), the cipher
1111            and/or cipher_id values may not be set. Make sure that
1112            cipher_id is set and use it for comparison. */
1113         if (s->session->cipher)
1114                 s->session->cipher_id = s->session->cipher->id;
1115         if (s->hit && (s->session->cipher_id != c->id))
1116                 {
1117 /* Workaround is now obsolete */
1118 #if 0
1119                 if (!(s->options &
1120                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1121 #endif
1122                         {
1123                         al=SSL_AD_ILLEGAL_PARAMETER;
1124                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1125                         goto f_err;
1126                         }
1127                 }
1128         s->s3->tmp.new_cipher=c;
1129         /* Don't digest cached records if no sigalgs: we may need them for
1130          * client authentication.
1131          */
1132         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1133                 goto f_err;
1134         /* lets get the compression algorithm */
1135         /* COMPRESSION */
1136 #ifdef OPENSSL_NO_COMP
1137         if (*(p++) != 0)
1138                 {
1139                 al=SSL_AD_ILLEGAL_PARAMETER;
1140                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1141                 goto f_err;
1142                 }
1143         /* If compression is disabled we'd better not try to resume a session
1144          * using compression.
1145          */
1146         if (s->session->compress_meth != 0)
1147                 {
1148                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1149                 goto f_err;
1150                 }
1151 #else
1152         j= *(p++);
1153         if (s->hit && j != s->session->compress_meth)
1154                 {
1155                 al=SSL_AD_ILLEGAL_PARAMETER;
1156                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1157                 goto f_err;
1158                 }
1159         if (j == 0)
1160                 comp=NULL;
1161         else if (!ssl_allow_compression(s))
1162                 {
1163                 al=SSL_AD_ILLEGAL_PARAMETER;
1164                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1165                 goto f_err;
1166                 }
1167         else
1168                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1169         
1170         if ((j != 0) && (comp == NULL))
1171                 {
1172                 al=SSL_AD_ILLEGAL_PARAMETER;
1173                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1174                 goto f_err;
1175                 }
1176         else
1177                 {
1178                 s->s3->tmp.new_compression=comp;
1179                 }
1180 #endif
1181
1182 #ifndef OPENSSL_NO_TLSEXT
1183         /* TLS extensions*/
1184         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1185                 {
1186                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1187                 goto err; 
1188                 }
1189 #endif
1190
1191         if (p != (d+n))
1192                 {
1193                 /* wrong packet length */
1194                 al=SSL_AD_DECODE_ERROR;
1195                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1196                 goto f_err;
1197                 }
1198
1199         return(1);
1200 f_err:
1201         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1202 err:
1203         return(-1);
1204         }
1205
1206 int ssl3_get_server_certificate(SSL *s)
1207         {
1208         int al,i,ok,ret= -1;
1209         unsigned long n,nc,llen,l;
1210         X509 *x=NULL;
1211         const unsigned char *q,*p;
1212         unsigned char *d;
1213         STACK_OF(X509) *sk=NULL;
1214         SESS_CERT *sc;
1215         EVP_PKEY *pkey=NULL;
1216         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1217
1218         n=s->method->ssl_get_message(s,
1219                 SSL3_ST_CR_CERT_A,
1220                 SSL3_ST_CR_CERT_B,
1221                 -1,
1222                 s->max_cert_list,
1223                 &ok);
1224
1225         if (!ok) return((int)n);
1226
1227         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1228                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 
1229                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1230                 {
1231                 s->s3->tmp.reuse_message=1;
1232                 return(1);
1233                 }
1234
1235         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1236                 {
1237                 al=SSL_AD_UNEXPECTED_MESSAGE;
1238                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1239                 goto f_err;
1240                 }
1241         p=d=(unsigned char *)s->init_msg;
1242
1243         if ((sk=sk_X509_new_null()) == NULL)
1244                 {
1245                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1246                 goto err;
1247                 }
1248
1249         n2l3(p,llen);
1250         if (llen+3 != n)
1251                 {
1252                 al=SSL_AD_DECODE_ERROR;
1253                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1254                 goto f_err;
1255                 }
1256         for (nc=0; nc<llen; )
1257                 {
1258                 n2l3(p,l);
1259                 if ((l+nc+3) > llen)
1260                         {
1261                         al=SSL_AD_DECODE_ERROR;
1262                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1263                         goto f_err;
1264                         }
1265
1266                 q=p;
1267                 x=d2i_X509(NULL,&q,l);
1268                 if (x == NULL)
1269                         {
1270                         al=SSL_AD_BAD_CERTIFICATE;
1271                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1272                         goto f_err;
1273                         }
1274                 if (q != (p+l))
1275                         {
1276                         al=SSL_AD_DECODE_ERROR;
1277                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1278                         goto f_err;
1279                         }
1280                 if (!sk_X509_push(sk,x))
1281                         {
1282                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1283                         goto err;
1284                         }
1285                 x=NULL;
1286                 nc+=l+3;
1287                 p=q;
1288                 }
1289
1290         i=ssl_verify_cert_chain(s,sk);
1291         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1292 #ifndef OPENSSL_NO_KRB5
1293             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1294                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1295 #endif /* OPENSSL_NO_KRB5 */
1296                 )
1297                 {
1298                 al=ssl_verify_alarm_type(s->verify_result);
1299                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1300                 goto f_err; 
1301                 }
1302         ERR_clear_error(); /* but we keep s->verify_result */
1303         if (i > 1)
1304                 {
1305                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1306                 al = SSL_AD_HANDSHAKE_FAILURE;
1307                 goto f_err;
1308                 }
1309
1310         sc=ssl_sess_cert_new();
1311         if (sc == NULL) goto err;
1312
1313         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1314         s->session->sess_cert=sc;
1315
1316         sc->cert_chain=sk;
1317         /* Inconsistency alert: cert_chain does include the peer's
1318          * certificate, which we don't include in s3_srvr.c */
1319         x=sk_X509_value(sk,0);
1320         sk=NULL;
1321         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1322
1323         pkey=X509_get_pubkey(x);
1324
1325         /* VRS: allow null cert if auth == KRB5 */
1326         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1327                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1328                     ? 0 : 1;
1329
1330 #ifdef KSSL_DEBUG
1331         printf("pkey,x = %p, %p\n", pkey,x);
1332         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1333         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1334                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1335 #endif    /* KSSL_DEBUG */
1336
1337         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1338                 {
1339                 x=NULL;
1340                 al=SSL3_AL_FATAL;
1341                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1342                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1343                 goto f_err;
1344                 }
1345
1346         i=ssl_cert_type(x,pkey);
1347         if (need_cert && i < 0)
1348                 {
1349                 x=NULL;
1350                 al=SSL3_AL_FATAL;
1351                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1352                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1353                 goto f_err;
1354                 }
1355
1356         if (need_cert)
1357                 {
1358                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1359                 if (exp_idx >= 0 && i != exp_idx)
1360                         {
1361                         x=NULL;
1362                         al=SSL_AD_ILLEGAL_PARAMETER;
1363                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1364                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1365                         goto f_err;
1366                         }
1367                 sc->peer_cert_type=i;
1368                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1369                 /* Why would the following ever happen?
1370                  * We just created sc a couple of lines ago. */
1371                 if (sc->peer_pkeys[i].x509 != NULL)
1372                         X509_free(sc->peer_pkeys[i].x509);
1373                 sc->peer_pkeys[i].x509=x;
1374                 sc->peer_key= &(sc->peer_pkeys[i]);
1375
1376                 if (s->session->peer != NULL)
1377                         X509_free(s->session->peer);
1378                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1379                 s->session->peer=x;
1380                 }
1381         else
1382                 {
1383                 sc->peer_cert_type=i;
1384                 sc->peer_key= NULL;
1385
1386                 if (s->session->peer != NULL)
1387                         X509_free(s->session->peer);
1388                 s->session->peer=NULL;
1389                 }
1390         s->session->verify_result = s->verify_result;
1391
1392         x=NULL;
1393         ret=1;
1394         if (0)
1395                 {
1396 f_err:
1397                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1398                 }
1399 err:
1400         EVP_PKEY_free(pkey);
1401         X509_free(x);
1402         sk_X509_pop_free(sk,X509_free);
1403         return(ret);
1404         }
1405
1406 int ssl3_get_key_exchange(SSL *s)
1407         {
1408 #ifndef OPENSSL_NO_RSA
1409         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1410 #endif
1411         EVP_MD_CTX md_ctx;
1412         unsigned char *param,*p;
1413         int al,i,j,param_len,ok;
1414         long n,alg_k,alg_a;
1415         EVP_PKEY *pkey=NULL;
1416         const EVP_MD *md = NULL;
1417 #ifndef OPENSSL_NO_RSA
1418         RSA *rsa=NULL;
1419 #endif
1420 #ifndef OPENSSL_NO_DH
1421         DH *dh=NULL;
1422 #endif
1423 #ifndef OPENSSL_NO_ECDH
1424         EC_KEY *ecdh = NULL;
1425         BN_CTX *bn_ctx = NULL;
1426         EC_POINT *srvr_ecpoint = NULL;
1427         int curve_nid = 0;
1428         int encoded_pt_len = 0;
1429 #endif
1430
1431         /* use same message size as in ssl3_get_certificate_request()
1432          * as ServerKeyExchange message may be skipped */
1433         n=s->method->ssl_get_message(s,
1434                 SSL3_ST_CR_KEY_EXCH_A,
1435                 SSL3_ST_CR_KEY_EXCH_B,
1436                 -1,
1437                 s->max_cert_list,
1438                 &ok);
1439         if (!ok) return((int)n);
1440
1441         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1442                 {
1443 #ifndef OPENSSL_NO_PSK
1444                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1445                    omitted if no identity hint is sent. Set
1446                    session->sess_cert anyway to avoid problems
1447                    later.*/
1448                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1449                         {
1450                         s->session->sess_cert=ssl_sess_cert_new();
1451                         if (s->ctx->psk_identity_hint)
1452                                 OPENSSL_free(s->ctx->psk_identity_hint);
1453                         s->ctx->psk_identity_hint = NULL;
1454                         }
1455 #endif
1456                 s->s3->tmp.reuse_message=1;
1457                 return(1);
1458                 }
1459
1460         param=p=(unsigned char *)s->init_msg;
1461         if (s->session->sess_cert != NULL)
1462                 {
1463 #ifndef OPENSSL_NO_RSA
1464                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1465                         {
1466                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1467                         s->session->sess_cert->peer_rsa_tmp=NULL;
1468                         }
1469 #endif
1470 #ifndef OPENSSL_NO_DH
1471                 if (s->session->sess_cert->peer_dh_tmp)
1472                         {
1473                         DH_free(s->session->sess_cert->peer_dh_tmp);
1474                         s->session->sess_cert->peer_dh_tmp=NULL;
1475                         }
1476 #endif
1477 #ifndef OPENSSL_NO_ECDH
1478                 if (s->session->sess_cert->peer_ecdh_tmp)
1479                         {
1480                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1481                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1482                         }
1483 #endif
1484                 }
1485         else
1486                 {
1487                 s->session->sess_cert=ssl_sess_cert_new();
1488                 }
1489
1490         param_len=0;
1491         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1492         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1493         EVP_MD_CTX_init(&md_ctx);
1494
1495 #ifndef OPENSSL_NO_PSK
1496         if (alg_k & SSL_kPSK)
1497                 {
1498                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1499
1500                 al=SSL_AD_HANDSHAKE_FAILURE;
1501                 n2s(p,i);
1502                 param_len=i+2;
1503                 /* Store PSK identity hint for later use, hint is used
1504                  * in ssl3_send_client_key_exchange.  Assume that the
1505                  * maximum length of a PSK identity hint can be as
1506                  * long as the maximum length of a PSK identity. */
1507                 if (i > PSK_MAX_IDENTITY_LEN)
1508                         {
1509                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1510                                 SSL_R_DATA_LENGTH_TOO_LONG);
1511                         goto f_err;
1512                         }
1513                 if (param_len > n)
1514                         {
1515                         al=SSL_AD_DECODE_ERROR;
1516                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1517                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1518                         goto f_err;
1519                         }
1520                 /* If received PSK identity hint contains NULL
1521                  * characters, the hint is truncated from the first
1522                  * NULL. p may not be ending with NULL, so create a
1523                  * NULL-terminated string. */
1524                 memcpy(tmp_id_hint, p, i);
1525                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1526                 if (s->ctx->psk_identity_hint != NULL)
1527                         OPENSSL_free(s->ctx->psk_identity_hint);
1528                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1529                 if (s->ctx->psk_identity_hint == NULL)
1530                         {
1531                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1532                         goto f_err;
1533                         }          
1534
1535                 p+=i;
1536                 n-=param_len;
1537                 }
1538         else
1539 #endif /* !OPENSSL_NO_PSK */
1540 #ifndef OPENSSL_NO_SRP
1541         if (alg_k & SSL_kSRP)
1542                 {
1543                 n2s(p,i);
1544                 param_len=i+2;
1545                 if (param_len > n)
1546                         {
1547                         al=SSL_AD_DECODE_ERROR;
1548                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1549                         goto f_err;
1550                         }
1551                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1552                         {
1553                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1554                         goto err;
1555                         }
1556                 p+=i;
1557
1558                 n2s(p,i);
1559                 param_len+=i+2;
1560                 if (param_len > n)
1561                         {
1562                         al=SSL_AD_DECODE_ERROR;
1563                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1564                         goto f_err;
1565                         }
1566                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1567                         {
1568                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1569                         goto err;
1570                         }
1571                 p+=i;
1572
1573                 i = (unsigned int)(p[0]);
1574                 p++;
1575                 param_len+=i+1;
1576                 if (param_len > n)
1577                         {
1578                         al=SSL_AD_DECODE_ERROR;
1579                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1580                         goto f_err;
1581                         }
1582                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1583                         {
1584                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1585                         goto err;
1586                         }
1587                 p+=i;
1588
1589                 n2s(p,i);
1590                 param_len+=i+2;
1591                 if (param_len > n)
1592                         {
1593                         al=SSL_AD_DECODE_ERROR;
1594                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1595                         goto f_err;
1596                         }
1597                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1598                         {
1599                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1600                         goto err;
1601                         }
1602                 p+=i;
1603                 n-=param_len;
1604
1605 /* We must check if there is a certificate */
1606 #ifndef OPENSSL_NO_RSA
1607                 if (alg_a & SSL_aRSA)
1608                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1609 #else
1610                 if (0)
1611                         ;
1612 #endif
1613 #ifndef OPENSSL_NO_DSA
1614                 else if (alg_a & SSL_aDSS)
1615                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1616 #endif
1617                 }
1618         else
1619 #endif /* !OPENSSL_NO_SRP */
1620 #ifndef OPENSSL_NO_RSA
1621         if (alg_k & SSL_kRSA)
1622                 {
1623                 if ((rsa=RSA_new()) == NULL)
1624                         {
1625                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1626                         goto err;
1627                         }
1628                 n2s(p,i);
1629                 param_len=i+2;
1630                 if (param_len > n)
1631                         {
1632                         al=SSL_AD_DECODE_ERROR;
1633                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1634                         goto f_err;
1635                         }
1636                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1637                         {
1638                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1639                         goto err;
1640                         }
1641                 p+=i;
1642
1643                 n2s(p,i);
1644                 param_len+=i+2;
1645                 if (param_len > n)
1646                         {
1647                         al=SSL_AD_DECODE_ERROR;
1648                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1649                         goto f_err;
1650                         }
1651                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1652                         {
1653                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1654                         goto err;
1655                         }
1656                 p+=i;
1657                 n-=param_len;
1658
1659                 /* this should be because we are using an export cipher */
1660                 if (alg_a & SSL_aRSA)
1661                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1662                 else
1663                         {
1664                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1665                         goto err;
1666                         }
1667                 s->session->sess_cert->peer_rsa_tmp=rsa;
1668                 rsa=NULL;
1669                 }
1670 #else /* OPENSSL_NO_RSA */
1671         if (0)
1672                 ;
1673 #endif
1674 #ifndef OPENSSL_NO_DH
1675         else if (alg_k & SSL_kDHE)
1676                 {
1677                 if ((dh=DH_new()) == NULL)
1678                         {
1679                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1680                         goto err;
1681                         }
1682                 n2s(p,i);
1683                 param_len=i+2;
1684                 if (param_len > n)
1685                         {
1686                         al=SSL_AD_DECODE_ERROR;
1687                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1688                         goto f_err;
1689                         }
1690                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1691                         {
1692                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1693                         goto err;
1694                         }
1695                 p+=i;
1696
1697                 n2s(p,i);
1698                 param_len+=i+2;
1699                 if (param_len > n)
1700                         {
1701                         al=SSL_AD_DECODE_ERROR;
1702                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1703                         goto f_err;
1704                         }
1705                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1706                         {
1707                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1708                         goto err;
1709                         }
1710                 p+=i;
1711
1712                 n2s(p,i);
1713                 param_len+=i+2;
1714                 if (param_len > n)
1715                         {
1716                         al=SSL_AD_DECODE_ERROR;
1717                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1718                         goto f_err;
1719                         }
1720                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1721                         {
1722                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1723                         goto err;
1724                         }
1725                 p+=i;
1726                 n-=param_len;
1727
1728                 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1729                                                 DH_security_bits(dh), 0, dh))
1730                         {
1731                         al=SSL_AD_HANDSHAKE_FAILURE;
1732                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_DH_KEY_TOO_SMALL);
1733                         goto f_err;
1734                         }
1735
1736 #ifndef OPENSSL_NO_RSA
1737                 if (alg_a & SSL_aRSA)
1738                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1739 #else
1740                 if (0)
1741                         ;
1742 #endif
1743 #ifndef OPENSSL_NO_DSA
1744                 else if (alg_a & SSL_aDSS)
1745                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1746 #endif
1747                 /* else anonymous DH, so no certificate or pkey. */
1748
1749                 s->session->sess_cert->peer_dh_tmp=dh;
1750                 dh=NULL;
1751                 }
1752         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1753                 {
1754                 al=SSL_AD_ILLEGAL_PARAMETER;
1755                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1756                 goto f_err;
1757                 }
1758 #endif /* !OPENSSL_NO_DH */
1759
1760 #ifndef OPENSSL_NO_ECDH
1761         else if (alg_k & SSL_kECDHE)
1762                 {
1763                 EC_GROUP *ngroup;
1764                 const EC_GROUP *group;
1765
1766                 if ((ecdh=EC_KEY_new()) == NULL)
1767                         {
1768                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1769                         goto err;
1770                         }
1771
1772                 /* Extract elliptic curve parameters and the
1773                  * server's ephemeral ECDH public key.
1774                  * Keep accumulating lengths of various components in
1775                  * param_len and make sure it never exceeds n.
1776                  */
1777
1778                 /* XXX: For now we only support named (not generic) curves
1779                  * and the ECParameters in this case is just three bytes.
1780                  */
1781                 param_len=3;
1782                 /* Check curve is one of our preferences, if not server has
1783                  * sent an invalid curve.
1784                  */
1785                 if (!tls1_check_curve(s, p, param_len))
1786                         {
1787                         al=SSL_AD_DECODE_ERROR;
1788                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1789                         goto f_err;
1790                         }
1791
1792                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) 
1793                         {
1794                         al=SSL_AD_INTERNAL_ERROR;
1795                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1796                         goto f_err;
1797                         }
1798
1799                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1800                 if (ngroup == NULL)
1801                         {
1802                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1803                         goto err;
1804                         }
1805                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1806                         {
1807                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1808                         goto err;
1809                         }
1810                 EC_GROUP_free(ngroup);
1811
1812                 group = EC_KEY_get0_group(ecdh);
1813
1814                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1815                     (EC_GROUP_get_degree(group) > 163))
1816                         {
1817                         al=SSL_AD_EXPORT_RESTRICTION;
1818                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1819                         goto f_err;
1820                         }
1821
1822                 p+=3;
1823
1824                 /* Next, get the encoded ECPoint */
1825                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1826                     ((bn_ctx = BN_CTX_new()) == NULL))
1827                         {
1828                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1829                         goto err;
1830                         }
1831
1832                 encoded_pt_len = *p;  /* length of encoded point */
1833                 p+=1;
1834                 param_len += (1 + encoded_pt_len);
1835                 if ((param_len > n) ||
1836                     (EC_POINT_oct2point(group, srvr_ecpoint, 
1837                         p, encoded_pt_len, bn_ctx) == 0))
1838                         {
1839                         al=SSL_AD_DECODE_ERROR;
1840                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1841                         goto f_err;
1842                         }
1843
1844                 n-=param_len;
1845                 p+=encoded_pt_len;
1846
1847                 /* The ECC/TLS specification does not mention
1848                  * the use of DSA to sign ECParameters in the server
1849                  * key exchange message. We do support RSA and ECDSA.
1850                  */
1851                 if (0) ;
1852 #ifndef OPENSSL_NO_RSA
1853                 else if (alg_a & SSL_aRSA)
1854                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1855 #endif
1856 #ifndef OPENSSL_NO_ECDSA
1857                 else if (alg_a & SSL_aECDSA)
1858                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1859 #endif
1860                 /* else anonymous ECDH, so no certificate or pkey. */
1861                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1862                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1863                 ecdh=NULL;
1864                 BN_CTX_free(bn_ctx);
1865                 bn_ctx = NULL;
1866                 EC_POINT_free(srvr_ecpoint);
1867                 srvr_ecpoint = NULL;
1868                 }
1869         else if (alg_k)
1870                 {
1871                 al=SSL_AD_UNEXPECTED_MESSAGE;
1872                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1873                 goto f_err;
1874                 }
1875 #endif /* !OPENSSL_NO_ECDH */
1876
1877
1878         /* p points to the next byte, there are 'n' bytes left */
1879
1880         /* if it was signed, check the signature */
1881         if (pkey != NULL)
1882                 {
1883                 if (SSL_USE_SIGALGS(s))
1884                         {
1885                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1886                         if (rv == -1)
1887                                 goto err;
1888                         else if (rv == 0)
1889                                 {
1890                                 al = SSL_AD_DECODE_ERROR;
1891                                 goto f_err;
1892                                 }
1893 #ifdef SSL_DEBUG
1894 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1895 #endif
1896                         p += 2;
1897                         n -= 2;
1898                         }
1899                 else
1900                         md = EVP_sha1();
1901                         
1902                 n2s(p,i);
1903                 n-=2;
1904                 j=EVP_PKEY_size(pkey);
1905
1906                 if ((i != n) || (n > j) || (n <= 0))
1907                         {
1908                         /* wrong packet length */
1909                         al=SSL_AD_DECODE_ERROR;
1910                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1911                         goto f_err;
1912                         }
1913
1914 #ifndef OPENSSL_NO_RSA
1915                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1916                         {
1917                         int num;
1918
1919                         j=0;
1920                         q=md_buf;
1921                         for (num=2; num > 0; num--)
1922                                 {
1923                                 EVP_MD_CTX_set_flags(&md_ctx,
1924                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1925                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1926                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1927                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1928                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1929                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1930                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1931                                 q+=i;
1932                                 j+=i;
1933                                 }
1934                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1935                                                                 pkey->pkey.rsa);
1936                         if (i < 0)
1937                                 {
1938                                 al=SSL_AD_DECRYPT_ERROR;
1939                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1940                                 goto f_err;
1941                                 }
1942                         if (i == 0)
1943                                 {
1944                                 /* bad signature */
1945                                 al=SSL_AD_DECRYPT_ERROR;
1946                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1947                                 goto f_err;
1948                                 }
1949                         }
1950                 else
1951 #endif
1952                         {
1953                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1954                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1955                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1956                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1957                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1958                                 {
1959                                 /* bad signature */
1960                                 al=SSL_AD_DECRYPT_ERROR;
1961                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1962                                 goto f_err;
1963                                 }
1964                         }
1965                 }
1966         else
1967                 {
1968                 /* aNULL or kPSK do not need public keys */
1969                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1970                         {
1971                         /* Might be wrong key type, check it */
1972                         if (ssl3_check_cert_and_algorithm(s))
1973                                 /* Otherwise this shouldn't happen */
1974                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1975                         goto err;
1976                         }
1977                 /* still data left over */
1978                 if (n != 0)
1979                         {
1980                         al=SSL_AD_DECODE_ERROR;
1981                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1982                         goto f_err;
1983                         }
1984                 }
1985         EVP_PKEY_free(pkey);
1986         EVP_MD_CTX_cleanup(&md_ctx);
1987         return(1);
1988 f_err:
1989         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1990 err:
1991         EVP_PKEY_free(pkey);
1992 #ifndef OPENSSL_NO_RSA
1993         if (rsa != NULL)
1994                 RSA_free(rsa);
1995 #endif
1996 #ifndef OPENSSL_NO_DH
1997         if (dh != NULL)
1998                 DH_free(dh);
1999 #endif
2000 #ifndef OPENSSL_NO_ECDH
2001         BN_CTX_free(bn_ctx);
2002         EC_POINT_free(srvr_ecpoint);
2003         if (ecdh != NULL)
2004                 EC_KEY_free(ecdh);
2005 #endif
2006         EVP_MD_CTX_cleanup(&md_ctx);
2007         return(-1);
2008         }
2009
2010 int ssl3_get_certificate_request(SSL *s)
2011         {
2012         int ok,ret=0;
2013         unsigned long n,nc,l;
2014         unsigned int llen, ctype_num,i;
2015         X509_NAME *xn=NULL;
2016         const unsigned char *p,*q;
2017         unsigned char *d;
2018         STACK_OF(X509_NAME) *ca_sk=NULL;
2019
2020         n=s->method->ssl_get_message(s,
2021                 SSL3_ST_CR_CERT_REQ_A,
2022                 SSL3_ST_CR_CERT_REQ_B,
2023                 -1,
2024                 s->max_cert_list,
2025                 &ok);
2026
2027         if (!ok) return((int)n);
2028
2029         s->s3->tmp.cert_req=0;
2030
2031         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2032                 {
2033                 s->s3->tmp.reuse_message=1;
2034                 /* If we get here we don't need any cached handshake records
2035                  * as we wont be doing client auth.
2036                  */
2037                 if (s->s3->handshake_buffer)
2038                         {
2039                         if (!ssl3_digest_cached_records(s))
2040                                 goto err;
2041                         }
2042                 return(1);
2043                 }
2044
2045         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2046                 {
2047                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2048                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2049                 goto err;
2050                 }
2051
2052         /* TLS does not like anon-DH with client cert */
2053         if (s->version > SSL3_VERSION)
2054                 {
2055                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2056                         {
2057                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2058                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2059                         goto err;
2060                         }
2061                 }
2062
2063         p=d=(unsigned char *)s->init_msg;
2064
2065         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2066                 {
2067                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2068                 goto err;
2069                 }
2070
2071         /* get the certificate types */
2072         ctype_num= *(p++);
2073         if (s->cert->ctypes)
2074                 {
2075                 OPENSSL_free(s->cert->ctypes);
2076                 s->cert->ctypes = NULL;
2077                 }
2078         if (ctype_num > SSL3_CT_NUMBER)
2079                 {
2080                 /* If we exceed static buffer copy all to cert structure */
2081                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2082                 memcpy(s->cert->ctypes, p, ctype_num);
2083                 s->cert->ctype_num = (size_t)ctype_num;
2084                 ctype_num=SSL3_CT_NUMBER;
2085                 }
2086         for (i=0; i<ctype_num; i++)
2087                 s->s3->tmp.ctype[i]= p[i];
2088         p+=p[-1];
2089         if (SSL_USE_SIGALGS(s))
2090                 {
2091                 n2s(p, llen);
2092                 /* Check we have enough room for signature algorithms and
2093                  * following length value.
2094                  */
2095                 if ((unsigned long)(p - d + llen + 2) > n)
2096                         {
2097                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2098                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2099                         goto err;
2100                         }
2101                 /* Clear certificate digests and validity flags */
2102                 for (i = 0; i < SSL_PKEY_NUM; i++)
2103                         {
2104                         s->cert->pkeys[i].digest = NULL;
2105                         s->cert->pkeys[i].valid_flags = 0;
2106                         }
2107                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
2108                         {
2109                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2110                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2111                         goto err;
2112                         }
2113                 p += llen;
2114                 }
2115
2116         /* get the CA RDNs */
2117         n2s(p,llen);
2118 #if 0
2119 {
2120 FILE *out;
2121 out=fopen("/tmp/vsign.der","w");
2122 fwrite(p,1,llen,out);
2123 fclose(out);
2124 }
2125 #endif
2126
2127         if ((unsigned long)(p - d + llen) != n)
2128                 {
2129                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2130                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2131                 goto err;
2132                 }
2133
2134         for (nc=0; nc<llen; )
2135                 {
2136                 n2s(p,l);
2137                 if ((l+nc+2) > llen)
2138                         {
2139                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2140                                 goto cont; /* netscape bugs */
2141                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2142                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2143                         goto err;
2144                         }
2145
2146                 q=p;
2147
2148                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2149                         {
2150                         /* If netscape tolerance is on, ignore errors */
2151                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2152                                 goto cont;
2153                         else
2154                                 {
2155                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2156                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2157                                 goto err;
2158                                 }
2159                         }
2160
2161                 if (q != (p+l))
2162                         {
2163                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2164                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2165                         goto err;
2166                         }
2167                 if (!sk_X509_NAME_push(ca_sk,xn))
2168                         {
2169                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2170                         goto err;
2171                         }
2172
2173                 p+=l;
2174                 nc+=l+2;
2175                 }
2176
2177         if (0)
2178                 {
2179 cont:
2180                 ERR_clear_error();
2181                 }
2182
2183         /* we should setup a certificate to return.... */
2184         s->s3->tmp.cert_req=1;
2185         s->s3->tmp.ctype_num=ctype_num;
2186         if (s->s3->tmp.ca_names != NULL)
2187                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2188         s->s3->tmp.ca_names=ca_sk;
2189         ca_sk=NULL;
2190
2191         ret=1;
2192 err:
2193         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2194         return(ret);
2195         }
2196
2197 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2198         {
2199         return(X509_NAME_cmp(*a,*b));
2200         }
2201 #ifndef OPENSSL_NO_TLSEXT
2202 int ssl3_get_new_session_ticket(SSL *s)
2203         {
2204         int ok,al,ret=0, ticklen;
2205         long n;
2206         const unsigned char *p;
2207         unsigned char *d;
2208
2209         n=s->method->ssl_get_message(s,
2210                 SSL3_ST_CR_SESSION_TICKET_A,
2211                 SSL3_ST_CR_SESSION_TICKET_B,
2212                 -1,
2213                 16384,
2214                 &ok);
2215
2216         if (!ok)
2217                 return((int)n);
2218
2219         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2220                 {
2221                 s->s3->tmp.reuse_message=1;
2222                 return(1);
2223                 }
2224         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2225                 {
2226                 al=SSL_AD_UNEXPECTED_MESSAGE;
2227                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2228                 goto f_err;
2229                 }
2230         if (n < 6)
2231                 {
2232                 /* need at least ticket_lifetime_hint + ticket length */
2233                 al = SSL_AD_DECODE_ERROR;
2234                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2235                 goto f_err;
2236                 }
2237
2238         p=d=(unsigned char *)s->init_msg;
2239         n2l(p, s->session->tlsext_tick_lifetime_hint);
2240         n2s(p, ticklen);
2241         /* ticket_lifetime_hint + ticket_length + ticket */
2242         if (ticklen + 6 != n)
2243                 {
2244                 al = SSL_AD_DECODE_ERROR;
2245                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2246                 goto f_err;
2247                 }
2248         if (s->session->tlsext_tick)
2249                 {
2250                 OPENSSL_free(s->session->tlsext_tick);
2251                 s->session->tlsext_ticklen = 0;
2252                 }
2253         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2254         if (!s->session->tlsext_tick)
2255                 {
2256                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2257                 goto err;
2258                 }
2259         memcpy(s->session->tlsext_tick, p, ticklen);
2260         s->session->tlsext_ticklen = ticklen;
2261         /* There are two ways to detect a resumed ticket sesion.
2262          * One is to set an appropriate session ID and then the server
2263          * must return a match in ServerHello. This allows the normal
2264          * client session ID matching to work and we know much 
2265          * earlier that the ticket has been accepted.
2266          * 
2267          * The other way is to set zero length session ID when the
2268          * ticket is presented and rely on the handshake to determine
2269          * session resumption.
2270          *
2271          * We choose the former approach because this fits in with
2272          * assumptions elsewhere in OpenSSL. The session ID is set
2273          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2274          * ticket.
2275          */ 
2276         EVP_Digest(p, ticklen,
2277                         s->session->session_id, &s->session->session_id_length,
2278 #ifndef OPENSSL_NO_SHA256
2279                                                         EVP_sha256(), NULL);
2280 #else
2281                                                         EVP_sha1(), NULL);
2282 #endif
2283         ret=1;
2284         return(ret);
2285 f_err:
2286         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2287 err:
2288         return(-1);
2289         }
2290
2291 int ssl3_get_cert_status(SSL *s)
2292         {
2293         int ok, al;
2294         unsigned long resplen,n;
2295         const unsigned char *p;
2296
2297         n=s->method->ssl_get_message(s,
2298                 SSL3_ST_CR_CERT_STATUS_A,
2299                 SSL3_ST_CR_CERT_STATUS_B,
2300                 SSL3_MT_CERTIFICATE_STATUS,
2301                 16384,
2302                 &ok);
2303
2304         if (!ok) return((int)n);
2305         if (n < 4)
2306                 {
2307                 /* need at least status type + length */
2308                 al = SSL_AD_DECODE_ERROR;
2309                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2310                 goto f_err;
2311                 }
2312         p = (unsigned char *)s->init_msg;
2313         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2314                 {
2315                 al = SSL_AD_DECODE_ERROR;
2316                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2317                 goto f_err;
2318                 }
2319         n2l3(p, resplen);
2320         if (resplen + 4 != n)
2321                 {
2322                 al = SSL_AD_DECODE_ERROR;
2323                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2324                 goto f_err;
2325                 }
2326         if (s->tlsext_ocsp_resp)
2327                 OPENSSL_free(s->tlsext_ocsp_resp);
2328         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2329         if (!s->tlsext_ocsp_resp)
2330                 {
2331                 al = SSL_AD_INTERNAL_ERROR;
2332                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2333                 goto f_err;
2334                 }
2335         s->tlsext_ocsp_resplen = resplen;
2336         if (s->ctx->tlsext_status_cb)
2337                 {
2338                 int ret;
2339                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2340                 if (ret == 0)
2341                         {
2342                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2343                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2344                         goto f_err;
2345                         }
2346                 if (ret < 0)
2347                         {
2348                         al = SSL_AD_INTERNAL_ERROR;
2349                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2350                         goto f_err;
2351                         }
2352                 }
2353         return 1;
2354 f_err:
2355         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2356         return(-1);
2357         }
2358 #endif
2359
2360 int ssl3_get_server_done(SSL *s)
2361         {
2362         int ok,ret=0;
2363         long n;
2364
2365         n=s->method->ssl_get_message(s,
2366                 SSL3_ST_CR_SRVR_DONE_A,
2367                 SSL3_ST_CR_SRVR_DONE_B,
2368                 SSL3_MT_SERVER_DONE,
2369                 30, /* should be very small, like 0 :-) */
2370                 &ok);
2371
2372         if (!ok) return((int)n);
2373         if (n > 0)
2374                 {
2375                 /* should contain no data */
2376                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2377                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2378                 return -1;
2379                 }
2380         ret=1;
2381         return(ret);
2382         }
2383
2384
2385 int ssl3_send_client_key_exchange(SSL *s)
2386         {
2387         unsigned char *p;
2388         int n;
2389         unsigned long alg_k;
2390 #ifndef OPENSSL_NO_RSA
2391         unsigned char *q;
2392         EVP_PKEY *pkey=NULL;
2393 #endif
2394 #ifndef OPENSSL_NO_KRB5
2395         KSSL_ERR kssl_err;
2396 #endif /* OPENSSL_NO_KRB5 */
2397 #ifndef OPENSSL_NO_ECDH
2398         EC_KEY *clnt_ecdh = NULL;
2399         const EC_POINT *srvr_ecpoint = NULL;
2400         EVP_PKEY *srvr_pub_pkey = NULL;
2401         unsigned char *encodedPoint = NULL;
2402         int encoded_pt_len = 0;
2403         BN_CTX * bn_ctx = NULL;
2404 #endif
2405
2406         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2407                 {
2408                 p = ssl_handshake_start(s);
2409
2410                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2411
2412                 /* Fool emacs indentation */
2413                 if (0) {}
2414 #ifndef OPENSSL_NO_RSA
2415                 else if (alg_k & SSL_kRSA)
2416                         {
2417                         RSA *rsa;
2418                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2419
2420                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2421                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2422                         else
2423                                 {
2424                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2425                                 if ((pkey == NULL) ||
2426                                         (pkey->type != EVP_PKEY_RSA) ||
2427                                         (pkey->pkey.rsa == NULL))
2428                                         {
2429                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2430                                         goto err;
2431                                         }
2432                                 rsa=pkey->pkey.rsa;
2433                                 EVP_PKEY_free(pkey);
2434                                 }
2435                                 
2436                         tmp_buf[0]=s->client_version>>8;
2437                         tmp_buf[1]=s->client_version&0xff;
2438                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2439                                         goto err;
2440
2441                         s->session->master_key_length=sizeof tmp_buf;
2442
2443                         q=p;
2444                         /* Fix buf for TLS and beyond */
2445                         if (s->version > SSL3_VERSION)
2446                                 p+=2;
2447                         n=RSA_public_encrypt(sizeof tmp_buf,
2448                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2449 #ifdef PKCS1_CHECK
2450                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2451                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2452 #endif
2453                         if (n <= 0)
2454                                 {
2455                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2456                                 goto err;
2457                                 }
2458
2459                         /* Fix buf for TLS and beyond */
2460                         if (s->version > SSL3_VERSION)
2461                                 {
2462                                 s2n(n,q);
2463                                 n+=2;
2464                                 }
2465
2466                         s->session->master_key_length=
2467                                 s->method->ssl3_enc->generate_master_secret(s,
2468                                         s->session->master_key,
2469                                         tmp_buf,sizeof tmp_buf);
2470                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2471                         }
2472 #endif
2473 #ifndef OPENSSL_NO_KRB5
2474                 else if (alg_k & SSL_kKRB5)
2475                         {
2476                         krb5_error_code krb5rc;
2477                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2478                         /*  krb5_data   krb5_ap_req;  */
2479                         krb5_data       *enc_ticket;
2480                         krb5_data       authenticator, *authp = NULL;
2481                         EVP_CIPHER_CTX  ciph_ctx;
2482                         const EVP_CIPHER *enc = NULL;
2483                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2484                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2485                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
2486                                                 + EVP_MAX_IV_LENGTH];
2487                         int             padl, outl = sizeof(epms);
2488
2489                         EVP_CIPHER_CTX_init(&ciph_ctx);
2490
2491 #ifdef KSSL_DEBUG
2492                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2493                                 alg_k, SSL_kKRB5);
2494 #endif  /* KSSL_DEBUG */
2495
2496                         authp = NULL;
2497 #ifdef KRB5SENDAUTH
2498                         if (KRB5SENDAUTH)  authp = &authenticator;
2499 #endif  /* KRB5SENDAUTH */
2500
2501                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2502                                 &kssl_err);
2503                         enc = kssl_map_enc(kssl_ctx->enctype);
2504                         if (enc == NULL)
2505                             goto err;
2506 #ifdef KSSL_DEBUG
2507                         {
2508                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2509                         if (krb5rc && kssl_err.text)
2510                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2511                         }
2512 #endif  /* KSSL_DEBUG */
2513
2514                         if (krb5rc)
2515                                 {
2516                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2517                                                 SSL_AD_HANDSHAKE_FAILURE);
2518                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2519                                                 kssl_err.reason);
2520                                 goto err;
2521                                 }
2522
2523                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2524                         **  in place of RFC 2712 KerberosWrapper, as in:
2525                         **
2526                         **  Send ticket (copy to *p, set n = length)
2527                         **  n = krb5_ap_req.length;
2528                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2529                         **  if (krb5_ap_req.data)  
2530                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2531                         **
2532                         **  Now using real RFC 2712 KerberosWrapper
2533                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2534                         **  Note: 2712 "opaque" types are here replaced
2535                         **  with a 2-byte length followed by the value.
2536                         **  Example:
2537                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2538                         **  Where "xx xx" = length bytes.  Shown here with
2539                         **  optional authenticator omitted.
2540                         */
2541
2542                         /*  KerberosWrapper.Ticket              */
2543                         s2n(enc_ticket->length,p);
2544                         memcpy(p, enc_ticket->data, enc_ticket->length);
2545                         p+= enc_ticket->length;
2546                         n = enc_ticket->length + 2;
2547
2548                         /*  KerberosWrapper.Authenticator       */
2549                         if (authp  &&  authp->length)  
2550                                 {
2551                                 s2n(authp->length,p);
2552                                 memcpy(p, authp->data, authp->length);
2553                                 p+= authp->length;
2554                                 n+= authp->length + 2;
2555                                 
2556                                 free(authp->data);
2557                                 authp->data = NULL;
2558                                 authp->length = 0;
2559                                 }
2560                         else
2561                                 {
2562                                 s2n(0,p);/*  null authenticator length  */
2563                                 n+=2;
2564                                 }
2565  
2566                             tmp_buf[0]=s->client_version>>8;
2567                             tmp_buf[1]=s->client_version&0xff;
2568                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2569                                 goto err;
2570
2571                         /*  20010420 VRS.  Tried it this way; failed.
2572                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2573                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2574                         **                              kssl_ctx->length);
2575                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2576                         */
2577
2578                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2579                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2580                                 kssl_ctx->key,iv);
2581                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2582                                 sizeof tmp_buf);
2583                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2584                         outl += padl;
2585                         if (outl > (int)sizeof epms)
2586                                 {
2587                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2588                                 goto err;
2589                                 }
2590                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2591
2592                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2593                         s2n(outl,p);
2594                         memcpy(p, epms, outl);
2595                         p+=outl;
2596                         n+=outl + 2;
2597
2598                         s->session->master_key_length=
2599                                 s->method->ssl3_enc->generate_master_secret(s,
2600                                         s->session->master_key,
2601                                         tmp_buf, sizeof tmp_buf);
2602
2603                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2604                         OPENSSL_cleanse(epms, outl);
2605                         }
2606 #endif
2607 #ifndef OPENSSL_NO_DH
2608                 else if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
2609                         {
2610                         DH *dh_srvr,*dh_clnt;
2611                         SESS_CERT *scert = s->session->sess_cert;
2612
2613                         if (scert == NULL) 
2614                                 {
2615                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2616                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2617                                 goto err;
2618                                 }
2619
2620                         if (scert->peer_dh_tmp != NULL)
2621                                 dh_srvr=scert->peer_dh_tmp;
2622                         else
2623                                 {
2624                                 /* we get them from the cert */
2625                                 int idx = scert->peer_cert_type;
2626                                 EVP_PKEY *spkey = NULL;
2627                                 dh_srvr = NULL;
2628                                 if (idx >= 0)
2629                                         spkey = X509_get_pubkey(
2630                                                 scert->peer_pkeys[idx].x509);
2631                                 if (spkey)
2632                                         {
2633                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2634                                         EVP_PKEY_free(spkey);
2635                                         }
2636                                 if (dh_srvr == NULL)
2637                                         {
2638                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2639                                             ERR_R_INTERNAL_ERROR);
2640                                         goto err;
2641                                         }
2642                                 }
2643                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2644                                 {
2645                                 /* Use client certificate key */
2646                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2647                                 dh_clnt = NULL;
2648                                 if (clkey)
2649                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2650                                 if (dh_clnt == NULL)
2651                                         {
2652                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2653                                             ERR_R_INTERNAL_ERROR);
2654                                         goto err;
2655                                         }
2656                                 }
2657                         else
2658                                 {
2659                                 /* generate a new random key */
2660                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2661                                         {
2662                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2663                                         goto err;
2664                                         }
2665                                 if (!DH_generate_key(dh_clnt))
2666                                         {
2667                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2668                                         DH_free(dh_clnt);
2669                                         goto err;
2670                                         }
2671                                 }
2672
2673                         /* use the 'p' output buffer for the DH key, but
2674                          * make sure to clear it out afterwards */
2675
2676                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2677                         if (scert->peer_dh_tmp == NULL)
2678                                 DH_free(dh_srvr);
2679
2680                         if (n <= 0)
2681                                 {
2682                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2683                                 DH_free(dh_clnt);
2684                                 goto err;
2685                                 }
2686
2687                         /* generate master key from the result */
2688                         s->session->master_key_length=
2689                                 s->method->ssl3_enc->generate_master_secret(s,
2690                                         s->session->master_key,p,n);
2691                         /* clean up */
2692                         memset(p,0,n);
2693
2694                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2695                                 n = 0;
2696                         else
2697                                 {
2698                                 /* send off the data */
2699                                 n=BN_num_bytes(dh_clnt->pub_key);
2700                                 s2n(n,p);
2701                                 BN_bn2bin(dh_clnt->pub_key,p);
2702                                 n+=2;
2703                                 }
2704
2705                         DH_free(dh_clnt);
2706
2707                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2708                         }
2709 #endif
2710
2711 #ifndef OPENSSL_NO_ECDH 
2712                 else if (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe))
2713                         {
2714                         const EC_GROUP *srvr_group = NULL;
2715                         EC_KEY *tkey;
2716                         int ecdh_clnt_cert = 0;
2717                         int field_size = 0;
2718
2719                         if (s->session->sess_cert == NULL) 
2720                                 {
2721                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2722                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2723                                 goto err;
2724                                 }
2725
2726                         /* Did we send out the client's
2727                          * ECDH share for use in premaster
2728                          * computation as part of client certificate?
2729                          * If so, set ecdh_clnt_cert to 1.
2730                          */
2731                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
2732                                 {
2733                                 /* XXX: For now, we do not support client
2734                                  * authentication using ECDH certificates.
2735                                  * To add such support, one needs to add
2736                                  * code that checks for appropriate 
2737                                  * conditions and sets ecdh_clnt_cert to 1.
2738                                  * For example, the cert have an ECC
2739                                  * key on the same curve as the server's
2740                                  * and the key should be authorized for
2741                                  * key agreement.
2742                                  *
2743                                  * One also needs to add code in ssl3_connect
2744                                  * to skip sending the certificate verify
2745                                  * message.
2746                                  *
2747                                  * if ((s->cert->key->privatekey != NULL) &&
2748                                  *     (s->cert->key->privatekey->type ==
2749                                  *      EVP_PKEY_EC) && ...)
2750                                  * ecdh_clnt_cert = 1;
2751                                  */
2752                                 }
2753
2754                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2755                                 {
2756                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2757                                 }
2758                         else
2759                                 {
2760                                 /* Get the Server Public Key from Cert */
2761                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2762                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2763                                 if ((srvr_pub_pkey == NULL) ||
2764                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2765                                     (srvr_pub_pkey->pkey.ec == NULL))
2766                                         {
2767                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2768                                             ERR_R_INTERNAL_ERROR);
2769                                         goto err;
2770                                         }
2771
2772                                 tkey = srvr_pub_pkey->pkey.ec;
2773                                 }
2774
2775                         srvr_group   = EC_KEY_get0_group(tkey);
2776                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2777
2778                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2779                                 {
2780                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2781                                     ERR_R_INTERNAL_ERROR);
2782                                 goto err;
2783                                 }
2784
2785                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
2786                                 {
2787                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2788                                 goto err;
2789                                 }
2790
2791                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2792                                 {
2793                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2794                                 goto err;
2795                                 }
2796                         if (ecdh_clnt_cert) 
2797                                 { 
2798                                 /* Reuse key info from our certificate
2799                                  * We only need our private key to perform
2800                                  * the ECDH computation.
2801                                  */
2802                                 const BIGNUM *priv_key;
2803                                 tkey = s->cert->key->privatekey->pkey.ec;
2804                                 priv_key = EC_KEY_get0_private_key(tkey);
2805                                 if (priv_key == NULL)
2806                                         {
2807                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2808                                         goto err;
2809                                         }
2810                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2811                                         {
2812                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2813                                         goto err;
2814                                         }
2815                                 }
2816                         else 
2817                                 {
2818                                 /* Generate a new ECDH key pair */
2819                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2820                                         {
2821                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2822                                         goto err;
2823                                         }
2824                                 }
2825
2826                         /* use the 'p' output buffer for the ECDH key, but
2827                          * make sure to clear it out afterwards
2828                          */
2829
2830                         field_size = EC_GROUP_get_degree(srvr_group);
2831                         if (field_size <= 0)
2832                                 {
2833                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2834                                        ERR_R_ECDH_LIB);
2835                                 goto err;
2836                                 }
2837                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2838                         if (n <= 0)
2839                                 {
2840                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
2841                                        ERR_R_ECDH_LIB);
2842                                 goto err;
2843                                 }
2844
2845                         /* generate master key from the result */
2846                         s->session->master_key_length = s->method->ssl3_enc \
2847                             -> generate_master_secret(s, 
2848                                 s->session->master_key,
2849                                 p, n);
2850
2851                         memset(p, 0, n); /* clean up */
2852
2853                         if (ecdh_clnt_cert) 
2854                                 {
2855                                 /* Send empty client key exch message */
2856                                 n = 0;
2857                                 }
2858                         else 
2859                                 {
2860                                 /* First check the size of encoding and
2861                                  * allocate memory accordingly.
2862                                  */
2863                                 encoded_pt_len = 
2864                                     EC_POINT_point2oct(srvr_group, 
2865                                         EC_KEY_get0_public_key(clnt_ecdh), 
2866                                         POINT_CONVERSION_UNCOMPRESSED, 
2867                                         NULL, 0, NULL);
2868
2869                                 encodedPoint = (unsigned char *) 
2870                                     OPENSSL_malloc(encoded_pt_len * 
2871                                         sizeof(unsigned char)); 
2872                                 bn_ctx = BN_CTX_new();
2873                                 if ((encodedPoint == NULL) || 
2874                                     (bn_ctx == NULL)) 
2875                                         {
2876                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2877                                         goto err;
2878                                         }
2879
2880                                 /* Encode the public key */
2881                                 n = EC_POINT_point2oct(srvr_group, 
2882                                     EC_KEY_get0_public_key(clnt_ecdh), 
2883                                     POINT_CONVERSION_UNCOMPRESSED, 
2884                                     encodedPoint, encoded_pt_len, bn_ctx);
2885
2886                                 *p = n; /* length of encoded point */
2887                                 /* Encoded point will be copied here */
2888                                 p += 1; 
2889                                 /* copy the point */
2890                                 memcpy((unsigned char *)p, encodedPoint, n);
2891                                 /* increment n to account for length field */
2892                                 n += 1; 
2893                                 }
2894
2895                         /* Free allocated memory */
2896                         BN_CTX_free(bn_ctx);
2897                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2898                         if (clnt_ecdh != NULL) 
2899                                  EC_KEY_free(clnt_ecdh);
2900                         EVP_PKEY_free(srvr_pub_pkey);
2901                         }
2902 #endif /* !OPENSSL_NO_ECDH */
2903                 else if (alg_k & SSL_kGOST) 
2904                         {
2905                         /* GOST key exchange message creation */
2906                         EVP_PKEY_CTX *pkey_ctx;
2907                         X509 *peer_cert; 
2908                         size_t msglen;
2909                         unsigned int md_len;
2910                         int keytype;
2911                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2912                         EVP_MD_CTX *ukm_hash;
2913                         EVP_PKEY *pub_key;
2914
2915                         /* Get server sertificate PKEY and create ctx from it */
2916                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2917                         if (!peer_cert) 
2918                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2919                         if (!peer_cert)         {
2920                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2921                                         goto err;
2922                                 }       
2923                                 
2924                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2925                         /* If we have send a certificate, and certificate key
2926
2927                          * parameters match those of server certificate, use
2928                          * certificate key for key exchange
2929                          */
2930
2931                          /* Otherwise, generate ephemeral key pair */
2932                                         
2933                         EVP_PKEY_encrypt_init(pkey_ctx);
2934                           /* Generate session key */    
2935                     RAND_bytes(premaster_secret,32);
2936                         /* If we have client certificate, use its secret as peer key */
2937                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2938                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2939                                         /* If there was an error - just ignore it. Ephemeral key
2940                                         * would be used
2941                                         */
2942                                         ERR_clear_error();
2943                                 }
2944                         }                       
2945                         /* Compute shared IV and store it in algorithm-specific
2946                          * context data */
2947                         ukm_hash = EVP_MD_CTX_create();
2948                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2949                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2950                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2951                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2952                         EVP_MD_CTX_destroy(ukm_hash);
2953                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2954                                 8,shared_ukm)<0) {
2955                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2956                                                 SSL_R_LIBRARY_BUG);
2957                                         goto err;
2958                                 }       
2959                         /* Make GOST keytransport blob message */
2960                         /*Encapsulate it into sequence */
2961                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2962                         msglen=255;
2963                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2964                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2965                                         SSL_R_LIBRARY_BUG);
2966                                 goto err;
2967                         }
2968                         if (msglen >= 0x80)
2969                                 {
2970                                 *(p++)=0x81;
2971                                 *(p++)= msglen & 0xff;
2972                                 n=msglen+3;
2973                                 }
2974                         else
2975                                 {
2976                                 *(p++)= msglen & 0xff;
2977                                 n=msglen+2;
2978                                 }
2979                         memcpy(p, tmp, msglen);
2980                         /* Check if pubkey from client certificate was used */
2981                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2982                                 {
2983                                 /* Set flag "skip certificate verify" */
2984                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2985                                 }
2986                         EVP_PKEY_CTX_free(pkey_ctx);
2987                         s->session->master_key_length=
2988                                 s->method->ssl3_enc->generate_master_secret(s,
2989                                         s->session->master_key,premaster_secret,32);
2990                         EVP_PKEY_free(pub_key);
2991
2992                         }
2993 #ifndef OPENSSL_NO_SRP
2994                 else if (alg_k & SSL_kSRP)
2995                         {
2996                         if (s->srp_ctx.A != NULL)
2997                                 {
2998                                 /* send off the data */
2999                                 n=BN_num_bytes(s->srp_ctx.A);
3000                                 s2n(n,p);
3001                                 BN_bn2bin(s->srp_ctx.A,p);
3002                                 n+=2;
3003                                 }
3004                         else
3005                                 {
3006                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3007                                 goto err;
3008                                 }
3009                         if (s->session->srp_username != NULL)
3010                                 OPENSSL_free(s->session->srp_username);
3011                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3012                         if (s->session->srp_username == NULL)
3013                                 {
3014                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3015                                         ERR_R_MALLOC_FAILURE);
3016                                 goto err;
3017                                 }
3018
3019                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3020                                 {
3021                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3022                                 goto err;
3023                                 }
3024                         }
3025 #endif
3026 #ifndef OPENSSL_NO_PSK
3027                 else if (alg_k & SSL_kPSK)
3028                         {
3029                         char identity[PSK_MAX_IDENTITY_LEN];
3030                         unsigned char *t = NULL;
3031                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3032                         unsigned int pre_ms_len = 0, psk_len = 0;
3033                         int psk_err = 1;
3034
3035                         n = 0;
3036                         if (s->psk_client_callback == NULL)
3037                                 {
3038                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3039                                         SSL_R_PSK_NO_CLIENT_CB);
3040                                 goto err;
3041                                 }
3042
3043                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3044                                 identity, PSK_MAX_IDENTITY_LEN,
3045                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3046                         if (psk_len > PSK_MAX_PSK_LEN)
3047                                 {
3048                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3049                                         ERR_R_INTERNAL_ERROR);
3050                                 goto psk_err;
3051                                 }
3052                         else if (psk_len == 0)
3053                                 {
3054                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3055                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3056                                 goto psk_err;
3057                                 }
3058
3059                         /* create PSK pre_master_secret */
3060                         pre_ms_len = 2+psk_len+2+psk_len;
3061                         t = psk_or_pre_ms;
3062                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3063                         s2n(psk_len, t);
3064                         memset(t, 0, psk_len);
3065                         t+=psk_len;
3066                         s2n(psk_len, t);
3067
3068                         if (s->session->psk_identity_hint != NULL)
3069                                 OPENSSL_free(s->session->psk_identity_hint);
3070                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3071                         if (s->ctx->psk_identity_hint != NULL &&
3072                                 s->session->psk_identity_hint == NULL)
3073                                 {
3074                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3075                                         ERR_R_MALLOC_FAILURE);
3076                                 goto psk_err;</