c3b5ff33ff89438f78d7071dbfd716d736d7f219
[dragonfly.git] / crypto / openssl / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
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 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include "ssl_locl.h"
156 #include "kssl_lcl.h"
157 #include <openssl/buffer.h>
158 #include <openssl/rand.h>
159 #include <openssl/objects.h>
160 #include <openssl/evp.h>
161 #include <openssl/hmac.h>
162 #include <openssl/x509.h>
163 #ifndef OPENSSL_NO_DH
164 #include <openssl/dh.h>
165 #endif
166 #include <openssl/bn.h>
167 #ifndef OPENSSL_NO_KRB5
168 #include <openssl/krb5_asn.h>
169 #endif
170 #include <openssl/md5.h>
171
172 static const SSL_METHOD *ssl3_get_server_method(int ver);
173
174 static const SSL_METHOD *ssl3_get_server_method(int ver)
175         {
176         if (ver == SSL3_VERSION)
177                 return(SSLv3_server_method());
178         else
179                 return(NULL);
180         }
181
182 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
183                         ssl3_accept,
184                         ssl_undefined_function,
185                         ssl3_get_server_method)
186
187 int ssl3_accept(SSL *s)
188         {
189         BUF_MEM *buf;
190         unsigned long alg_k,Time=(unsigned long)time(NULL);
191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
192         int ret= -1;
193         int new_state,state,skip=0;
194
195         RAND_add(&Time,sizeof(Time),0);
196         ERR_clear_error();
197         clear_sys_error();
198
199         if (s->info_callback != NULL)
200                 cb=s->info_callback;
201         else if (s->ctx->info_callback != NULL)
202                 cb=s->ctx->info_callback;
203
204         /* init things to blank */
205         s->in_handshake++;
206         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
207
208         if (s->cert == NULL)
209                 {
210                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
211                 return(-1);
212                 }
213
214         for (;;)
215                 {
216                 state=s->state;
217
218                 switch (s->state)
219                         {
220                 case SSL_ST_RENEGOTIATE:
221                         s->new_session=1;
222                         /* s->state=SSL_ST_ACCEPT; */
223
224                 case SSL_ST_BEFORE:
225                 case SSL_ST_ACCEPT:
226                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
227                 case SSL_ST_OK|SSL_ST_ACCEPT:
228
229                         s->server=1;
230                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
231
232                         if ((s->version>>8) != 3)
233                                 {
234                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
235                                 return -1;
236                                 }
237                         s->type=SSL_ST_ACCEPT;
238
239                         if (s->init_buf == NULL)
240                                 {
241                                 if ((buf=BUF_MEM_new()) == NULL)
242                                         {
243                                         ret= -1;
244                                         goto end;
245                                         }
246                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
247                                         {
248                                         ret= -1;
249                                         goto end;
250                                         }
251                                 s->init_buf=buf;
252                                 }
253
254                         if (!ssl3_setup_buffers(s))
255                                 {
256                                 ret= -1;
257                                 goto end;
258                                 }
259
260                         s->init_num=0;
261
262                         if (s->state != SSL_ST_RENEGOTIATE)
263                                 {
264                                 /* Ok, we now need to push on a buffering BIO so that
265                                  * the output is sent in a way that TCP likes :-)
266                                  */
267                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
268                                 
269                                 ssl3_init_finished_mac(s);
270                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
271                                 s->ctx->stats.sess_accept++;
272                                 }
273                         else if (!s->s3->send_connection_binding &&
274                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
275                                 {
276                                 /* Server attempting to renegotiate with
277                                  * client that doesn't support secure
278                                  * renegotiation.
279                                  */
280                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
281                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
282                                 ret = -1;
283                                 goto end;
284                                 }
285                         else
286                                 {
287                                 /* s->state == SSL_ST_RENEGOTIATE,
288                                  * we will just send a HelloRequest */
289                                 s->ctx->stats.sess_accept_renegotiate++;
290                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
291                                 }
292                         break;
293
294                 case SSL3_ST_SW_HELLO_REQ_A:
295                 case SSL3_ST_SW_HELLO_REQ_B:
296
297                         s->shutdown=0;
298                         ret=ssl3_send_hello_request(s);
299                         if (ret <= 0) goto end;
300                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
301                         s->state=SSL3_ST_SW_FLUSH;
302                         s->init_num=0;
303
304                         ssl3_init_finished_mac(s);
305                         break;
306
307                 case SSL3_ST_SW_HELLO_REQ_C:
308                         s->state=SSL_ST_OK;
309                         break;
310
311                 case SSL3_ST_SR_CLNT_HELLO_A:
312                 case SSL3_ST_SR_CLNT_HELLO_B:
313                 case SSL3_ST_SR_CLNT_HELLO_C:
314
315                         s->shutdown=0;
316                         ret=ssl3_get_client_hello(s);
317                         if (ret <= 0) goto end;
318                         
319                         s->new_session = 2;
320                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
321                         s->init_num=0;
322                         break;
323
324                 case SSL3_ST_SW_SRVR_HELLO_A:
325                 case SSL3_ST_SW_SRVR_HELLO_B:
326                         ret=ssl3_send_server_hello(s);
327                         if (ret <= 0) goto end;
328 #ifndef OPENSSL_NO_TLSEXT
329                         if (s->hit)
330                                 {
331                                 if (s->tlsext_ticket_expected)
332                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
333                                 else
334                                         s->state=SSL3_ST_SW_CHANGE_A;
335                                 }
336 #else
337                         if (s->hit)
338                                         s->state=SSL3_ST_SW_CHANGE_A;
339 #endif
340                         else
341                                 s->state=SSL3_ST_SW_CERT_A;
342                         s->init_num=0;
343                         break;
344
345                 case SSL3_ST_SW_CERT_A:
346                 case SSL3_ST_SW_CERT_B:
347                         /* Check if it is anon DH or anon ECDH, */
348                         /* normal PSK or KRB5 */
349                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
350                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
351                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
352                                 {
353                                 ret=ssl3_send_server_certificate(s);
354                                 if (ret <= 0) goto end;
355 #ifndef OPENSSL_NO_TLSEXT
356                                 if (s->tlsext_status_expected)
357                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
358                                 else
359                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
360                                 }
361                         else
362                                 {
363                                 skip = 1;
364                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
365                                 }
366 #else
367                                 }
368                         else
369                                 skip=1;
370
371                         s->state=SSL3_ST_SW_KEY_EXCH_A;
372 #endif
373                         s->init_num=0;
374                         break;
375
376                 case SSL3_ST_SW_KEY_EXCH_A:
377                 case SSL3_ST_SW_KEY_EXCH_B:
378                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
379
380                         /* clear this, it may get reset by
381                          * send_server_key_exchange */
382                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
383 #ifndef OPENSSL_NO_KRB5
384                                 && !(alg_k & SSL_kKRB5)
385 #endif /* OPENSSL_NO_KRB5 */
386                                 )
387                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
388                                  * even when forbidden by protocol specs
389                                  * (handshake may fail as clients are not required to
390                                  * be able to handle this) */
391                                 s->s3->tmp.use_rsa_tmp=1;
392                         else
393                                 s->s3->tmp.use_rsa_tmp=0;
394
395
396                         /* only send if a DH key exchange, fortezza or
397                          * RSA but we have a sign only certificate
398                          *
399                          * PSK: may send PSK identity hints
400                          *
401                          * For ECC ciphersuites, we send a serverKeyExchange
402                          * message only if the cipher suite is either
403                          * ECDH-anon or ECDHE. In other cases, the
404                          * server certificate contains the server's
405                          * public key for key exchange.
406                          */
407                         if (s->s3->tmp.use_rsa_tmp
408                         /* PSK: send ServerKeyExchange if PSK identity
409                          * hint if provided */
410 #ifndef OPENSSL_NO_PSK
411                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
412 #endif
413                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
414                             || (alg_k & SSL_kEECDH)
415                             || ((alg_k & SSL_kRSA)
416                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
417                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
418                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
419                                         )
420                                     )
421                                 )
422                             )
423                                 {
424                                 ret=ssl3_send_server_key_exchange(s);
425                                 if (ret <= 0) goto end;
426                                 }
427                         else
428                                 skip=1;
429
430                         s->state=SSL3_ST_SW_CERT_REQ_A;
431                         s->init_num=0;
432                         break;
433
434                 case SSL3_ST_SW_CERT_REQ_A:
435                 case SSL3_ST_SW_CERT_REQ_B:
436                         if (/* don't request cert unless asked for it: */
437                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
438                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
439                                  * don't request cert during re-negotiation: */
440                                 ((s->session->peer != NULL) &&
441                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
442                                 /* never request cert in anonymous ciphersuites
443                                  * (see section "Certificate request" in SSL 3 drafts
444                                  * and in RFC 2246): */
445                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
446                                  /* ... except when the application insists on verification
447                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
448                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
449                                  /* never request cert in Kerberos ciphersuites */
450                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
451                                 /* With normal PSK Certificates and
452                                  * Certificate Requests are omitted */
453                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
454                                 {
455                                 /* no cert request */
456                                 skip=1;
457                                 s->s3->tmp.cert_request=0;
458                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
459                                 }
460                         else
461                                 {
462                                 s->s3->tmp.cert_request=1;
463                                 ret=ssl3_send_certificate_request(s);
464                                 if (ret <= 0) goto end;
465 #ifndef NETSCAPE_HANG_BUG
466                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
467 #else
468                                 s->state=SSL3_ST_SW_FLUSH;
469                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
470 #endif
471                                 s->init_num=0;
472                                 }
473                         break;
474
475                 case SSL3_ST_SW_SRVR_DONE_A:
476                 case SSL3_ST_SW_SRVR_DONE_B:
477                         ret=ssl3_send_server_done(s);
478                         if (ret <= 0) goto end;
479                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
480                         s->state=SSL3_ST_SW_FLUSH;
481                         s->init_num=0;
482                         break;
483                 
484                 case SSL3_ST_SW_FLUSH:
485
486                         /* This code originally checked to see if
487                          * any data was pending using BIO_CTRL_INFO
488                          * and then flushed. This caused problems
489                          * as documented in PR#1939. The proposed
490                          * fix doesn't completely resolve this issue
491                          * as buggy implementations of BIO_CTRL_PENDING
492                          * still exist. So instead we just flush
493                          * unconditionally.
494                          */
495
496                         s->rwstate=SSL_WRITING;
497                         if (BIO_flush(s->wbio) <= 0)
498                                 {
499                                 ret= -1;
500                                 goto end;
501                                 }
502                         s->rwstate=SSL_NOTHING;
503
504                         s->state=s->s3->tmp.next_state;
505                         break;
506
507                 case SSL3_ST_SR_CERT_A:
508                 case SSL3_ST_SR_CERT_B:
509                         /* Check for second client hello (MS SGC) */
510                         ret = ssl3_check_client_hello(s);
511                         if (ret <= 0)
512                                 goto end;
513                         if (ret == 2)
514                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
515                         else {
516                                 if (s->s3->tmp.cert_request)
517                                         {
518                                         ret=ssl3_get_client_certificate(s);
519                                         if (ret <= 0) goto end;
520                                         }
521                                 s->init_num=0;
522                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
523                         }
524                         break;
525
526                 case SSL3_ST_SR_KEY_EXCH_A:
527                 case SSL3_ST_SR_KEY_EXCH_B:
528                         ret=ssl3_get_client_key_exchange(s);
529                         if (ret <= 0)
530                                 goto end;
531                         if (ret == 2)
532                                 {
533                                 /* For the ECDH ciphersuites when
534                                  * the client sends its ECDH pub key in
535                                  * a certificate, the CertificateVerify
536                                  * message is not sent.
537                                  * Also for GOST ciphersuites when
538                                  * the client uses its key from the certificate
539                                  * for key exchange.
540                                  */
541                                 s->state=SSL3_ST_SR_FINISHED_A;
542                                 s->init_num = 0;
543                                 }
544                         else
545                                 {
546                                 int offset=0;
547                                 int dgst_num;
548
549                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
550                                 s->init_num=0;
551
552                                 /* We need to get hashes here so if there is
553                                  * a client cert, it can be verified
554                                  * FIXME - digest processing for CertificateVerify
555                                  * should be generalized. But it is next step
556                                  */
557                                 if (s->s3->handshake_buffer)
558                                         if (!ssl3_digest_cached_records(s))
559                                                 return -1;
560                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
561                                         if (s->s3->handshake_dgst[dgst_num]) 
562                                                 {
563                                                 int dgst_size;
564
565                                                 s->method->ssl3_enc->cert_verify_mac(s,EVP_MD_CTX_type(s->s3->handshake_dgst[dgst_num]),&(s->s3->tmp.cert_verify_md[offset]));
566                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
567                                                 if (dgst_size < 0)
568                                                         {
569                                                         ret = -1;
570                                                         goto end;
571                                                         }
572                                                 offset+=dgst_size;
573                                                 }               
574                                 }
575                         break;
576
577                 case SSL3_ST_SR_CERT_VRFY_A:
578                 case SSL3_ST_SR_CERT_VRFY_B:
579
580                         /* we should decide if we expected this one */
581                         ret=ssl3_get_cert_verify(s);
582                         if (ret <= 0) goto end;
583
584                         s->state=SSL3_ST_SR_FINISHED_A;
585                         s->init_num=0;
586                         break;
587
588                 case SSL3_ST_SR_FINISHED_A:
589                 case SSL3_ST_SR_FINISHED_B:
590                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
591                                 SSL3_ST_SR_FINISHED_B);
592                         if (ret <= 0) goto end;
593 #ifndef OPENSSL_NO_TLSEXT
594                         if (s->tlsext_ticket_expected)
595                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
596                         else if (s->hit)
597                                 s->state=SSL_ST_OK;
598 #else
599                         if (s->hit)
600                                 s->state=SSL_ST_OK;
601 #endif
602                         else
603                                 s->state=SSL3_ST_SW_CHANGE_A;
604                         s->init_num=0;
605                         break;
606
607 #ifndef OPENSSL_NO_TLSEXT
608                 case SSL3_ST_SW_SESSION_TICKET_A:
609                 case SSL3_ST_SW_SESSION_TICKET_B:
610                         ret=ssl3_send_newsession_ticket(s);
611                         if (ret <= 0) goto end;
612                         s->state=SSL3_ST_SW_CHANGE_A;
613                         s->init_num=0;
614                         break;
615
616                 case SSL3_ST_SW_CERT_STATUS_A:
617                 case SSL3_ST_SW_CERT_STATUS_B:
618                         ret=ssl3_send_cert_status(s);
619                         if (ret <= 0) goto end;
620                         s->state=SSL3_ST_SW_KEY_EXCH_A;
621                         s->init_num=0;
622                         break;
623
624 #endif
625
626                 case SSL3_ST_SW_CHANGE_A:
627                 case SSL3_ST_SW_CHANGE_B:
628
629                         s->session->cipher=s->s3->tmp.new_cipher;
630                         if (!s->method->ssl3_enc->setup_key_block(s))
631                                 { ret= -1; goto end; }
632
633                         ret=ssl3_send_change_cipher_spec(s,
634                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
635
636                         if (ret <= 0) goto end;
637                         s->state=SSL3_ST_SW_FINISHED_A;
638                         s->init_num=0;
639
640                         if (!s->method->ssl3_enc->change_cipher_state(s,
641                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
642                                 {
643                                 ret= -1;
644                                 goto end;
645                                 }
646
647                         break;
648
649                 case SSL3_ST_SW_FINISHED_A:
650                 case SSL3_ST_SW_FINISHED_B:
651                         ret=ssl3_send_finished(s,
652                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
653                                 s->method->ssl3_enc->server_finished_label,
654                                 s->method->ssl3_enc->server_finished_label_len);
655                         if (ret <= 0) goto end;
656                         s->state=SSL3_ST_SW_FLUSH;
657                         if (s->hit)
658                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
659                         else
660                                 s->s3->tmp.next_state=SSL_ST_OK;
661                         s->init_num=0;
662                         break;
663
664                 case SSL_ST_OK:
665                         /* clean a few things up */
666                         ssl3_cleanup_key_block(s);
667
668                         BUF_MEM_free(s->init_buf);
669                         s->init_buf=NULL;
670
671                         /* remove buffering on output */
672                         ssl_free_wbio_buffer(s);
673
674                         s->init_num=0;
675
676                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
677                                 {
678                                 /* actually not necessarily a 'new' session unless
679                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
680                                 
681                                 s->new_session=0;
682                                 
683                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
684                                 
685                                 s->ctx->stats.sess_accept_good++;
686                                 /* s->server=1; */
687                                 s->handshake_func=ssl3_accept;
688
689                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
690                                 }
691                         
692                         ret = 1;
693                         goto end;
694                         /* break; */
695
696                 default:
697                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
698                         ret= -1;
699                         goto end;
700                         /* break; */
701                         }
702                 
703                 if (!s->s3->tmp.reuse_message && !skip)
704                         {
705                         if (s->debug)
706                                 {
707                                 if ((ret=BIO_flush(s->wbio)) <= 0)
708                                         goto end;
709                                 }
710
711
712                         if ((cb != NULL) && (s->state != state))
713                                 {
714                                 new_state=s->state;
715                                 s->state=state;
716                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
717                                 s->state=new_state;
718                                 }
719                         }
720                 skip=0;
721                 }
722 end:
723         /* BIO_flush(s->wbio); */
724
725         s->in_handshake--;
726         if (cb != NULL)
727                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
728         return(ret);
729         }
730
731 int ssl3_send_hello_request(SSL *s)
732         {
733         unsigned char *p;
734
735         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
736                 {
737                 p=(unsigned char *)s->init_buf->data;
738                 *(p++)=SSL3_MT_HELLO_REQUEST;
739                 *(p++)=0;
740                 *(p++)=0;
741                 *(p++)=0;
742
743                 s->state=SSL3_ST_SW_HELLO_REQ_B;
744                 /* number of bytes to write */
745                 s->init_num=4;
746                 s->init_off=0;
747                 }
748
749         /* SSL3_ST_SW_HELLO_REQ_B */
750         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
751         }
752
753 int ssl3_check_client_hello(SSL *s)
754         {
755         int ok;
756         long n;
757
758         /* this function is called when we really expect a Certificate message,
759          * so permit appropriate message length */
760         n=s->method->ssl_get_message(s,
761                 SSL3_ST_SR_CERT_A,
762                 SSL3_ST_SR_CERT_B,
763                 -1,
764                 s->max_cert_list,
765                 &ok);
766         if (!ok) return((int)n);
767         s->s3->tmp.reuse_message = 1;
768         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
769                 {
770                 /* Throw away what we have done so far in the current handshake,
771                  * which will now be aborted. (A full SSL_clear would be too much.) */
772 #ifndef OPENSSL_NO_DH
773                 if (s->s3->tmp.dh != NULL)
774                         {
775                         DH_free(s->s3->tmp.dh);
776                         s->s3->tmp.dh = NULL;
777                         }
778 #endif
779 #ifndef OPENSSL_NO_ECDH
780                 if (s->s3->tmp.ecdh != NULL)
781                         {
782                         EC_KEY_free(s->s3->tmp.ecdh);
783                         s->s3->tmp.ecdh = NULL;
784                         }
785 #endif
786                 return 2;
787                 }
788         return 1;
789 }
790
791 int ssl3_get_client_hello(SSL *s)
792         {
793         int i,j,ok,al,ret= -1;
794         unsigned int cookie_len;
795         long n;
796         unsigned long id;
797         unsigned char *p,*d,*q;
798         SSL_CIPHER *c;
799 #ifndef OPENSSL_NO_COMP
800         SSL_COMP *comp=NULL;
801 #endif
802         STACK_OF(SSL_CIPHER) *ciphers=NULL;
803
804         /* We do this so that we will respond with our native type.
805          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
806          * This down switching should be handled by a different method.
807          * If we are SSLv3, we will respond with SSLv3, even if prompted with
808          * TLSv1.
809          */
810         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
811                 {
812                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
813                 }
814         s->first_packet=1;
815         n=s->method->ssl_get_message(s,
816                 SSL3_ST_SR_CLNT_HELLO_B,
817                 SSL3_ST_SR_CLNT_HELLO_C,
818                 SSL3_MT_CLIENT_HELLO,
819                 SSL3_RT_MAX_PLAIN_LENGTH,
820                 &ok);
821
822         if (!ok) return((int)n);
823         s->first_packet=0;
824         d=p=(unsigned char *)s->init_msg;
825
826         /* use version from inside client hello, not from record header
827          * (may differ: see RFC 2246, Appendix E, second paragraph) */
828         s->client_version=(((int)p[0])<<8)|(int)p[1];
829         p+=2;
830
831         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
832             (s->version != DTLS1_VERSION && s->client_version < s->version))
833                 {
834                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
835                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
836                         {
837                         /* similar to ssl3_get_record, send alert using remote version number */
838                         s->version = s->client_version;
839                         }
840                 al = SSL_AD_PROTOCOL_VERSION;
841                 goto f_err;
842                 }
843
844         /* If we require cookies and this ClientHello doesn't
845          * contain one, just return since we do not want to
846          * allocate any memory yet. So check cookie length...
847          */
848         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
849                 {
850                 unsigned int session_length, cookie_length;
851                 
852                 session_length = *(p + SSL3_RANDOM_SIZE);
853                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
854
855                 if (cookie_length == 0)
856                         return 1;
857                 }
858
859         /* load the client random */
860         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
861         p+=SSL3_RANDOM_SIZE;
862
863         /* get the session-id */
864         j= *(p++);
865
866         s->hit=0;
867         /* Versions before 0.9.7 always allow session reuse during renegotiation
868          * (i.e. when s->new_session is true), option
869          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
870          * Maybe this optional behaviour should always have been the default,
871          * but we cannot safely change the default behaviour (or new applications
872          * might be written that become totally unsecure when compiled with
873          * an earlier library version)
874          */
875         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
876                 {
877                 if (!ssl_get_new_session(s,1))
878                         goto err;
879                 }
880         else
881                 {
882                 i=ssl_get_prev_session(s, p, j, d + n);
883                 if (i == 1)
884                         { /* previous session */
885                         s->hit=1;
886                         }
887                 else if (i == -1)
888                         goto err;
889                 else /* i == 0 */
890                         {
891                         if (!ssl_get_new_session(s,1))
892                                 goto err;
893                         }
894                 }
895
896         p+=j;
897
898         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
899                 {
900                 /* cookie stuff */
901                 cookie_len = *(p++);
902
903                 /* 
904                  * The ClientHello may contain a cookie even if the
905                  * HelloVerify message has not been sent--make sure that it
906                  * does not cause an overflow.
907                  */
908                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
909                         {
910                         /* too much data */
911                         al = SSL_AD_DECODE_ERROR;
912                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
913                         goto f_err;
914                         }
915
916                 /* verify the cookie if appropriate option is set. */
917                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
918                         cookie_len > 0)
919                         {
920                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
921
922                         if ( s->ctx->app_verify_cookie_cb != NULL)
923                                 {
924                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
925                                         cookie_len) == 0)
926                                         {
927                                         al=SSL_AD_HANDSHAKE_FAILURE;
928                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
929                                                 SSL_R_COOKIE_MISMATCH);
930                                         goto f_err;
931                                         }
932                                 /* else cookie verification succeeded */
933                                 }
934                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
935                                                   s->d1->cookie_len) != 0) /* default verification */
936                                 {
937                                         al=SSL_AD_HANDSHAKE_FAILURE;
938                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
939                                                 SSL_R_COOKIE_MISMATCH);
940                                         goto f_err;
941                                 }
942
943                         ret = 2;
944                         }
945
946                 p += cookie_len;
947                 }
948
949         n2s(p,i);
950         if ((i == 0) && (j != 0))
951                 {
952                 /* we need a cipher if we are not resuming a session */
953                 al=SSL_AD_ILLEGAL_PARAMETER;
954                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
955                 goto f_err;
956                 }
957         if ((p+i) >= (d+n))
958                 {
959                 /* not enough data */
960                 al=SSL_AD_DECODE_ERROR;
961                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
962                 goto f_err;
963                 }
964         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
965                 == NULL))
966                 {
967                 goto err;
968                 }
969         p+=i;
970
971         /* If it is a hit, check that the cipher is in the list */
972         if ((s->hit) && (i > 0))
973                 {
974                 j=0;
975                 id=s->session->cipher->id;
976
977 #ifdef CIPHER_DEBUG
978                 printf("client sent %d ciphers\n",sk_num(ciphers));
979 #endif
980                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
981                         {
982                         c=sk_SSL_CIPHER_value(ciphers,i);
983 #ifdef CIPHER_DEBUG
984                         printf("client [%2d of %2d]:%s\n",
985                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
986 #endif
987                         if (c->id == id)
988                                 {
989                                 j=1;
990                                 break;
991                                 }
992                         }
993 /* Disabled because it can be used in a ciphersuite downgrade
994  * attack: CVE-2010-4180.
995  */
996 #if 0
997                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
998                         {
999                         /* Special case as client bug workaround: the previously used cipher may
1000                          * not be in the current list, the client instead might be trying to
1001                          * continue using a cipher that before wasn't chosen due to server
1002                          * preferences.  We'll have to reject the connection if the cipher is not
1003                          * enabled, though. */
1004                         c = sk_SSL_CIPHER_value(ciphers, 0);
1005                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1006                                 {
1007                                 s->session->cipher = c;
1008                                 j = 1;
1009                                 }
1010                         }
1011 #endif
1012                 if (j == 0)
1013                         {
1014                         /* we need to have the cipher in the cipher
1015                          * list if we are asked to reuse it */
1016                         al=SSL_AD_ILLEGAL_PARAMETER;
1017                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1018                         goto f_err;
1019                         }
1020                 }
1021
1022         /* compression */
1023         i= *(p++);
1024         if ((p+i) > (d+n))
1025                 {
1026                 /* not enough data */
1027                 al=SSL_AD_DECODE_ERROR;
1028                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1029                 goto f_err;
1030                 }
1031         q=p;
1032         for (j=0; j<i; j++)
1033                 {
1034                 if (p[j] == 0) break;
1035                 }
1036
1037         p+=i;
1038         if (j >= i)
1039                 {
1040                 /* no compress */
1041                 al=SSL_AD_DECODE_ERROR;
1042                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1043                 goto f_err;
1044                 }
1045
1046 #ifndef OPENSSL_NO_TLSEXT
1047         /* TLS extensions*/
1048         if (s->version >= SSL3_VERSION)
1049                 {
1050                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1051                         {
1052                         /* 'al' set by ssl_parse_clienthello_tlsext */
1053                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1054                         goto f_err;
1055                         }
1056                 }
1057                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1058                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1059                         goto err;
1060                 }
1061
1062         /* Check if we want to use external pre-shared secret for this
1063          * handshake for not reused session only. We need to generate
1064          * server_random before calling tls_session_secret_cb in order to allow
1065          * SessionTicket processing to use it in key derivation. */
1066         {
1067                 unsigned long Time;
1068                 unsigned char *pos;
1069                 Time=(unsigned long)time(NULL);                 /* Time */
1070                 pos=s->s3->server_random;
1071                 l2n(Time,pos);
1072                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1073                         {
1074                         al=SSL_AD_INTERNAL_ERROR;
1075                         goto f_err;
1076                         }
1077         }
1078
1079         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1080                 {
1081                 SSL_CIPHER *pref_cipher=NULL;
1082
1083                 s->session->master_key_length=sizeof(s->session->master_key);
1084                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1085                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1086                         {
1087                         s->hit=1;
1088                         s->session->ciphers=ciphers;
1089                         s->session->verify_result=X509_V_OK;
1090
1091                         ciphers=NULL;
1092
1093                         /* check if some cipher was preferred by call back */
1094                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1095                         if (pref_cipher == NULL)
1096                                 {
1097                                 al=SSL_AD_HANDSHAKE_FAILURE;
1098                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1099                                 goto f_err;
1100                                 }
1101
1102                         s->session->cipher=pref_cipher;
1103
1104                         if (s->cipher_list)
1105                                 sk_SSL_CIPHER_free(s->cipher_list);
1106
1107                         if (s->cipher_list_by_id)
1108                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1109
1110                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1111                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1112                         }
1113                 }
1114 #endif
1115
1116         /* Worst case, we will use the NULL compression, but if we have other
1117          * options, we will now look for them.  We have i-1 compression
1118          * algorithms from the client, starting at q. */
1119         s->s3->tmp.new_compression=NULL;
1120 #ifndef OPENSSL_NO_COMP
1121         /* This only happens if we have a cache hit */
1122         if (s->session->compress_meth != 0)
1123                 {
1124                 int m, comp_id = s->session->compress_meth;
1125                 /* Perform sanity checks on resumed compression algorithm */
1126                 /* Can't disable compression */
1127                 if (s->options & SSL_OP_NO_COMPRESSION)
1128                         {
1129                         al=SSL_AD_INTERNAL_ERROR;
1130                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1131                         goto f_err;
1132                         }
1133                 /* Look for resumed compression method */
1134                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1135                         {
1136                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1137                         if (comp_id == comp->id)
1138                                 {
1139                                 s->s3->tmp.new_compression=comp;
1140                                 break;
1141                                 }
1142                         }
1143                 if (s->s3->tmp.new_compression == NULL)
1144                         {
1145                         al=SSL_AD_INTERNAL_ERROR;
1146                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1147                         goto f_err;
1148                         }
1149                 /* Look for resumed method in compression list */
1150                 for (m = 0; m < i; m++)
1151                         {
1152                         if (q[m] == comp_id)
1153                                 break;
1154                         }
1155                 if (m >= i)
1156                         {
1157                         al=SSL_AD_ILLEGAL_PARAMETER;
1158                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1159                         goto f_err;
1160                         }
1161                 }
1162         else if (s->hit)
1163                 comp = NULL;
1164         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1165                 { /* See if we have a match */
1166                 int m,nn,o,v,done=0;
1167
1168                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1169                 for (m=0; m<nn; m++)
1170                         {
1171                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1172                         v=comp->id;
1173                         for (o=0; o<i; o++)
1174                                 {
1175                                 if (v == q[o])
1176                                         {
1177                                         done=1;
1178                                         break;
1179                                         }
1180                                 }
1181                         if (done) break;
1182                         }
1183                 if (done)
1184                         s->s3->tmp.new_compression=comp;
1185                 else
1186                         comp=NULL;
1187                 }
1188 #else
1189         /* If compression is disabled we'd better not try to resume a session
1190          * using compression.
1191          */
1192         if (s->session->compress_meth != 0)
1193                 {
1194                 al=SSL_AD_INTERNAL_ERROR;
1195                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1196                 goto f_err;
1197                 }
1198 #endif
1199
1200         /* Given s->session->ciphers and SSL_get_ciphers, we must
1201          * pick a cipher */
1202
1203         if (!s->hit)
1204                 {
1205 #ifdef OPENSSL_NO_COMP
1206                 s->session->compress_meth=0;
1207 #else
1208                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1209 #endif
1210                 if (s->session->ciphers != NULL)
1211                         sk_SSL_CIPHER_free(s->session->ciphers);
1212                 s->session->ciphers=ciphers;
1213                 if (ciphers == NULL)
1214                         {
1215                         al=SSL_AD_ILLEGAL_PARAMETER;
1216                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1217                         goto f_err;
1218                         }
1219                 ciphers=NULL;
1220                 c=ssl3_choose_cipher(s,s->session->ciphers,
1221                                      SSL_get_ciphers(s));
1222
1223                 if (c == NULL)
1224                         {
1225                         al=SSL_AD_HANDSHAKE_FAILURE;
1226                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1227                         goto f_err;
1228                         }
1229                 s->s3->tmp.new_cipher=c;
1230                 }
1231         else
1232                 {
1233                 /* Session-id reuse */
1234 #ifdef REUSE_CIPHER_BUG
1235                 STACK_OF(SSL_CIPHER) *sk;
1236                 SSL_CIPHER *nc=NULL;
1237                 SSL_CIPHER *ec=NULL;
1238
1239                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1240                         {
1241                         sk=s->session->ciphers;
1242                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1243                                 {
1244                                 c=sk_SSL_CIPHER_value(sk,i);
1245                                 if (c->algorithm_enc & SSL_eNULL)
1246                                         nc=c;
1247                                 if (SSL_C_IS_EXPORT(c))
1248                                         ec=c;
1249                                 }
1250                         if (nc != NULL)
1251                                 s->s3->tmp.new_cipher=nc;
1252                         else if (ec != NULL)
1253                                 s->s3->tmp.new_cipher=ec;
1254                         else
1255                                 s->s3->tmp.new_cipher=s->session->cipher;
1256                         }
1257                 else
1258 #endif
1259                 s->s3->tmp.new_cipher=s->session->cipher;
1260                 }
1261
1262         if (!ssl3_digest_cached_records(s))
1263                 goto f_err;
1264         
1265         /* we now have the following setup. 
1266          * client_random
1267          * cipher_list          - our prefered list of ciphers
1268          * ciphers              - the clients prefered list of ciphers
1269          * compression          - basically ignored right now
1270          * ssl version is set   - sslv3
1271          * s->session           - The ssl session has been setup.
1272          * s->hit               - session reuse flag
1273          * s->tmp.new_cipher    - the new cipher to use.
1274          */
1275
1276         if (ret < 0) ret=1;
1277         if (0)
1278                 {
1279 f_err:
1280                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1281                 }
1282 err:
1283         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1284         return(ret);
1285         }
1286
1287 int ssl3_send_server_hello(SSL *s)
1288         {
1289         unsigned char *buf;
1290         unsigned char *p,*d;
1291         int i,sl;
1292         unsigned long l;
1293 #ifdef OPENSSL_NO_TLSEXT
1294         unsigned long Time;
1295 #endif
1296
1297         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1298                 {
1299                 buf=(unsigned char *)s->init_buf->data;
1300 #ifdef OPENSSL_NO_TLSEXT
1301                 p=s->s3->server_random;
1302                 /* Generate server_random if it was not needed previously */
1303                 Time=(unsigned long)time(NULL);                 /* Time */
1304                 l2n(Time,p);
1305                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1306                         return -1;
1307 #endif
1308                 /* Do the message type and length last */
1309                 d=p= &(buf[4]);
1310
1311                 *(p++)=s->version>>8;
1312                 *(p++)=s->version&0xff;
1313
1314                 /* Random stuff */
1315                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1316                 p+=SSL3_RANDOM_SIZE;
1317
1318                 /* now in theory we have 3 options to sending back the
1319                  * session id.  If it is a re-use, we send back the
1320                  * old session-id, if it is a new session, we send
1321                  * back the new session-id or we send back a 0 length
1322                  * session-id if we want it to be single use.
1323                  * Currently I will not implement the '0' length session-id
1324                  * 12-Jan-98 - I'll now support the '0' length stuff.
1325                  *
1326                  * We also have an additional case where stateless session
1327                  * resumption is successful: we always send back the old
1328                  * session id. In this case s->hit is non zero: this can
1329                  * only happen if stateless session resumption is succesful
1330                  * if session caching is disabled so existing functionality
1331                  * is unaffected.
1332                  */
1333                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1334                         && !s->hit)
1335                         s->session->session_id_length=0;
1336
1337                 sl=s->session->session_id_length;
1338                 if (sl > (int)sizeof(s->session->session_id))
1339                         {
1340                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1341                         return -1;
1342                         }
1343                 *(p++)=sl;
1344                 memcpy(p,s->session->session_id,sl);
1345                 p+=sl;
1346
1347                 /* put the cipher */
1348                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1349                 p+=i;
1350
1351                 /* put the compression method */
1352 #ifdef OPENSSL_NO_COMP
1353                         *(p++)=0;
1354 #else
1355                 if (s->s3->tmp.new_compression == NULL)
1356                         *(p++)=0;
1357                 else
1358                         *(p++)=s->s3->tmp.new_compression->id;
1359 #endif
1360 #ifndef OPENSSL_NO_TLSEXT
1361                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1362                         {
1363                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1364                         return -1;
1365                         }
1366                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1367                         {
1368                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1369                         return -1;
1370                         }
1371 #endif
1372                 /* do the header */
1373                 l=(p-d);
1374                 d=buf;
1375                 *(d++)=SSL3_MT_SERVER_HELLO;
1376                 l2n3(l,d);
1377
1378                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1379                 /* number of bytes to write */
1380                 s->init_num=p-buf;
1381                 s->init_off=0;
1382                 }
1383
1384         /* SSL3_ST_SW_SRVR_HELLO_B */
1385         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1386         }
1387
1388 int ssl3_send_server_done(SSL *s)
1389         {
1390         unsigned char *p;
1391
1392         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1393                 {
1394                 p=(unsigned char *)s->init_buf->data;
1395
1396                 /* do the header */
1397                 *(p++)=SSL3_MT_SERVER_DONE;
1398                 *(p++)=0;
1399                 *(p++)=0;
1400                 *(p++)=0;
1401
1402                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1403                 /* number of bytes to write */
1404                 s->init_num=4;
1405                 s->init_off=0;
1406                 }
1407
1408         /* SSL3_ST_SW_SRVR_DONE_B */
1409         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1410         }
1411
1412 int ssl3_send_server_key_exchange(SSL *s)
1413         {
1414 #ifndef OPENSSL_NO_RSA
1415         unsigned char *q;
1416         int j,num;
1417         RSA *rsa;
1418         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1419         unsigned int u;
1420 #endif
1421 #ifndef OPENSSL_NO_DH
1422         DH *dh=NULL,*dhp;
1423 #endif
1424 #ifndef OPENSSL_NO_ECDH
1425         EC_KEY *ecdh=NULL, *ecdhp;
1426         unsigned char *encodedPoint = NULL;
1427         int encodedlen = 0;
1428         int curve_id = 0;
1429         BN_CTX *bn_ctx = NULL; 
1430 #endif
1431         EVP_PKEY *pkey;
1432         unsigned char *p,*d;
1433         int al,i;
1434         unsigned long type;
1435         int n;
1436         CERT *cert;
1437         BIGNUM *r[4];
1438         int nr[4],kn;
1439         BUF_MEM *buf;
1440         EVP_MD_CTX md_ctx;
1441
1442         EVP_MD_CTX_init(&md_ctx);
1443         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1444                 {
1445                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1446                 cert=s->cert;
1447
1448                 buf=s->init_buf;
1449
1450                 r[0]=r[1]=r[2]=r[3]=NULL;
1451                 n=0;
1452 #ifndef OPENSSL_NO_RSA
1453                 if (type & SSL_kRSA)
1454                         {
1455                         rsa=cert->rsa_tmp;
1456                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1457                                 {
1458                                 rsa=s->cert->rsa_tmp_cb(s,
1459                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1460                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1461                                 if(rsa == NULL)
1462                                 {
1463                                         al=SSL_AD_HANDSHAKE_FAILURE;
1464                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1465                                         goto f_err;
1466                                 }
1467                                 RSA_up_ref(rsa);
1468                                 cert->rsa_tmp=rsa;
1469                                 }
1470                         if (rsa == NULL)
1471                                 {
1472                                 al=SSL_AD_HANDSHAKE_FAILURE;
1473                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1474                                 goto f_err;
1475                                 }
1476                         r[0]=rsa->n;
1477                         r[1]=rsa->e;
1478                         s->s3->tmp.use_rsa_tmp=1;
1479                         }
1480                 else
1481 #endif
1482 #ifndef OPENSSL_NO_DH
1483                         if (type & SSL_kEDH)
1484                         {
1485                         dhp=cert->dh_tmp;
1486                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1487                                 dhp=s->cert->dh_tmp_cb(s,
1488                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1489                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1490                         if (dhp == NULL)
1491                                 {
1492                                 al=SSL_AD_HANDSHAKE_FAILURE;
1493                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1494                                 goto f_err;
1495                                 }
1496
1497                         if (s->s3->tmp.dh != NULL)
1498                                 {
1499                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1500                                 goto err;
1501                                 }
1502
1503                         if ((dh=DHparams_dup(dhp)) == NULL)
1504                                 {
1505                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1506                                 goto err;
1507                                 }
1508
1509                         s->s3->tmp.dh=dh;
1510                         if ((dhp->pub_key == NULL ||
1511                              dhp->priv_key == NULL ||
1512                              (s->options & SSL_OP_SINGLE_DH_USE)))
1513                                 {
1514                                 if(!DH_generate_key(dh))
1515                                     {
1516                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1517                                            ERR_R_DH_LIB);
1518                                     goto err;
1519                                     }
1520                                 }
1521                         else
1522                                 {
1523                                 dh->pub_key=BN_dup(dhp->pub_key);
1524                                 dh->priv_key=BN_dup(dhp->priv_key);
1525                                 if ((dh->pub_key == NULL) ||
1526                                         (dh->priv_key == NULL))
1527                                         {
1528                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1529                                         goto err;
1530                                         }
1531                                 }
1532                         r[0]=dh->p;
1533                         r[1]=dh->g;
1534                         r[2]=dh->pub_key;
1535                         }
1536                 else 
1537 #endif
1538 #ifndef OPENSSL_NO_ECDH
1539                         if (type & SSL_kEECDH)
1540                         {
1541                         const EC_GROUP *group;
1542
1543                         ecdhp=cert->ecdh_tmp;
1544                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1545                                 {
1546                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1547                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1548                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1549                                 }
1550                         if (ecdhp == NULL)
1551                                 {
1552                                 al=SSL_AD_HANDSHAKE_FAILURE;
1553                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1554                                 goto f_err;
1555                                 }
1556
1557                         if (s->s3->tmp.ecdh != NULL)
1558                                 {
1559                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1560                                 goto err;
1561                                 }
1562
1563                         /* Duplicate the ECDH structure. */
1564                         if (ecdhp == NULL)
1565                                 {
1566                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1567                                 goto err;
1568                                 }
1569                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1570                                 {
1571                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1572                                 goto err;
1573                                 }
1574
1575                         s->s3->tmp.ecdh=ecdh;
1576                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1577                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1578                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1579                                 {
1580                                 if(!EC_KEY_generate_key(ecdh))
1581                                     {
1582                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1583                                     goto err;
1584                                     }
1585                                 }
1586
1587                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1588                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1589                             (EC_KEY_get0_private_key(ecdh) == NULL))
1590                                 {
1591                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1592                                 goto err;
1593                                 }
1594
1595                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1596                             (EC_GROUP_get_degree(group) > 163)) 
1597                                 {
1598                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1599                                 goto err;
1600                                 }
1601
1602                         /* XXX: For now, we only support ephemeral ECDH
1603                          * keys over named (not generic) curves. For 
1604                          * supported named curves, curve_id is non-zero.
1605                          */
1606                         if ((curve_id = 
1607                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1608                             == 0)
1609                                 {
1610                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1611                                 goto err;
1612                                 }
1613
1614                         /* Encode the public key.
1615                          * First check the size of encoding and
1616                          * allocate memory accordingly.
1617                          */
1618                         encodedlen = EC_POINT_point2oct(group, 
1619                             EC_KEY_get0_public_key(ecdh),
1620                             POINT_CONVERSION_UNCOMPRESSED, 
1621                             NULL, 0, NULL);
1622
1623                         encodedPoint = (unsigned char *) 
1624                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1625                         bn_ctx = BN_CTX_new();
1626                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1627                                 {
1628                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1629                                 goto err;
1630                                 }
1631
1632
1633                         encodedlen = EC_POINT_point2oct(group, 
1634                             EC_KEY_get0_public_key(ecdh), 
1635                             POINT_CONVERSION_UNCOMPRESSED, 
1636                             encodedPoint, encodedlen, bn_ctx);
1637
1638                         if (encodedlen == 0) 
1639                                 {
1640                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1641                                 goto err;
1642                                 }
1643
1644                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1645
1646                         /* XXX: For now, we only support named (not 
1647                          * generic) curves in ECDH ephemeral key exchanges.
1648                          * In this situation, we need four additional bytes
1649                          * to encode the entire ServerECDHParams
1650                          * structure. 
1651                          */
1652                         n = 4 + encodedlen;
1653
1654                         /* We'll generate the serverKeyExchange message
1655                          * explicitly so we can set these to NULLs
1656                          */
1657                         r[0]=NULL;
1658                         r[1]=NULL;
1659                         r[2]=NULL;
1660                         r[3]=NULL;
1661                         }
1662                 else 
1663 #endif /* !OPENSSL_NO_ECDH */
1664 #ifndef OPENSSL_NO_PSK
1665                         if (type & SSL_kPSK)
1666                                 {
1667                                 /* reserve size for record length and PSK identity hint*/
1668                                 n+=2+strlen(s->ctx->psk_identity_hint);
1669                                 }
1670                         else
1671 #endif /* !OPENSSL_NO_PSK */
1672                         {
1673                         al=SSL_AD_HANDSHAKE_FAILURE;
1674                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1675                         goto f_err;
1676                         }
1677                 for (i=0; r[i] != NULL; i++)
1678                         {
1679                         nr[i]=BN_num_bytes(r[i]);
1680                         n+=2+nr[i];
1681                         }
1682
1683                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1684                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1685                         {
1686                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1687                                 == NULL)
1688                                 {
1689                                 al=SSL_AD_DECODE_ERROR;
1690                                 goto f_err;
1691                                 }
1692                         kn=EVP_PKEY_size(pkey);
1693                         }
1694                 else
1695                         {
1696                         pkey=NULL;
1697                         kn=0;
1698                         }
1699
1700                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1701                         {
1702                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1703                         goto err;
1704                         }
1705                 d=(unsigned char *)s->init_buf->data;
1706                 p= &(d[4]);
1707
1708                 for (i=0; r[i] != NULL; i++)
1709                         {
1710                         s2n(nr[i],p);
1711                         BN_bn2bin(r[i],p);
1712                         p+=nr[i];
1713                         }
1714
1715 #ifndef OPENSSL_NO_ECDH
1716                 if (type & SSL_kEECDH) 
1717                         {
1718                         /* XXX: For now, we only support named (not generic) curves.
1719                          * In this situation, the serverKeyExchange message has:
1720                          * [1 byte CurveType], [2 byte CurveName]
1721                          * [1 byte length of encoded point], followed by
1722                          * the actual encoded point itself
1723                          */
1724                         *p = NAMED_CURVE_TYPE;
1725                         p += 1;
1726                         *p = 0;
1727                         p += 1;
1728                         *p = curve_id;
1729                         p += 1;
1730                         *p = encodedlen;
1731                         p += 1;
1732                         memcpy((unsigned char*)p, 
1733                             (unsigned char *)encodedPoint, 
1734                             encodedlen);
1735                         OPENSSL_free(encodedPoint);
1736                         encodedPoint = NULL;
1737                         p += encodedlen;
1738                         }
1739 #endif
1740
1741 #ifndef OPENSSL_NO_PSK
1742                 if (type & SSL_kPSK)
1743                         {
1744                         /* copy PSK identity hint */
1745                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1746                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1747                         p+=strlen(s->ctx->psk_identity_hint);
1748                         }
1749 #endif
1750
1751                 /* not anonymous */
1752                 if (pkey != NULL)
1753                         {
1754                         /* n is the length of the params, they start at &(d[4])
1755                          * and p points to the space at the end. */
1756 #ifndef OPENSSL_NO_RSA
1757                         if (pkey->type == EVP_PKEY_RSA)
1758                                 {
1759                                 q=md_buf;
1760                                 j=0;
1761                                 for (num=2; num > 0; num--)
1762                                         {
1763                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1764                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1765                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1766                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1767                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1768                                         EVP_DigestFinal_ex(&md_ctx,q,
1769                                                 (unsigned int *)&i);
1770                                         q+=i;
1771                                         j+=i;
1772                                         }
1773                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1774                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1775                                         {
1776                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1777                                         goto err;
1778                                         }
1779                                 s2n(u,p);
1780                                 n+=u+2;
1781                                 }
1782                         else
1783 #endif
1784 #if !defined(OPENSSL_NO_DSA)
1785                                 if (pkey->type == EVP_PKEY_DSA)
1786                                 {
1787                                 /* lets do DSS */
1788                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1789                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1790                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1791                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1792                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1793                                         (unsigned int *)&i,pkey))
1794                                         {
1795                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1796                                         goto err;
1797                                         }
1798                                 s2n(i,p);
1799                                 n+=i+2;
1800                                 }
1801                         else
1802 #endif
1803 #if !defined(OPENSSL_NO_ECDSA)
1804                                 if (pkey->type == EVP_PKEY_EC)
1805                                 {
1806                                 /* let's do ECDSA */
1807                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1808                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1809                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1810                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1811                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1812                                         (unsigned int *)&i,pkey))
1813                                         {
1814                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1815                                         goto err;
1816                                         }
1817                                 s2n(i,p);
1818                                 n+=i+2;
1819                                 }
1820                         else
1821 #endif
1822                                 {
1823                                 /* Is this error check actually needed? */
1824                                 al=SSL_AD_HANDSHAKE_FAILURE;
1825                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1826                                 goto f_err;
1827                                 }
1828                         }
1829
1830                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1831                 l2n3(n,d);
1832
1833                 /* we should now have things packed up, so lets send
1834                  * it off */
1835                 s->init_num=n+4;
1836                 s->init_off=0;
1837                 }
1838
1839         s->state = SSL3_ST_SW_KEY_EXCH_B;
1840         EVP_MD_CTX_cleanup(&md_ctx);
1841         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1842 f_err:
1843         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1844 err:
1845 #ifndef OPENSSL_NO_ECDH
1846         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1847         BN_CTX_free(bn_ctx);
1848 #endif
1849         EVP_MD_CTX_cleanup(&md_ctx);
1850         return(-1);
1851         }
1852
1853 int ssl3_send_certificate_request(SSL *s)
1854         {
1855         unsigned char *p,*d;
1856         int i,j,nl,off,n;
1857         STACK_OF(X509_NAME) *sk=NULL;
1858         X509_NAME *name;
1859         BUF_MEM *buf;
1860
1861         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1862                 {
1863                 buf=s->init_buf;
1864
1865                 d=p=(unsigned char *)&(buf->data[4]);
1866
1867                 /* get the list of acceptable cert types */
1868                 p++;
1869                 n=ssl3_get_req_cert_type(s,p);
1870                 d[0]=n;
1871                 p+=n;
1872                 n++;
1873
1874                 off=n;
1875                 p+=2;
1876                 n+=2;
1877
1878                 sk=SSL_get_client_CA_list(s);
1879                 nl=0;
1880                 if (sk != NULL)
1881                         {
1882                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1883                                 {
1884                                 name=sk_X509_NAME_value(sk,i);
1885                                 j=i2d_X509_NAME(name,NULL);
1886                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1887                                         {
1888                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1889                                         goto err;
1890                                         }
1891                                 p=(unsigned char *)&(buf->data[4+n]);
1892                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1893                                         {
1894                                         s2n(j,p);
1895                                         i2d_X509_NAME(name,&p);
1896                                         n+=2+j;
1897                                         nl+=2+j;
1898                                         }
1899                                 else
1900                                         {
1901                                         d=p;
1902                                         i2d_X509_NAME(name,&p);
1903                                         j-=2; s2n(j,d); j+=2;
1904                                         n+=j;
1905                                         nl+=j;
1906                                         }
1907                                 }
1908                         }
1909                 /* else no CA names */
1910                 p=(unsigned char *)&(buf->data[4+off]);
1911                 s2n(nl,p);
1912
1913                 d=(unsigned char *)buf->data;
1914                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1915                 l2n3(n,d);
1916
1917                 /* we should now have things packed up, so lets send
1918                  * it off */
1919
1920                 s->init_num=n+4;
1921                 s->init_off=0;
1922 #ifdef NETSCAPE_HANG_BUG
1923                 p=(unsigned char *)s->init_buf->data + s->init_num;
1924
1925                 /* do the header */
1926                 *(p++)=SSL3_MT_SERVER_DONE;
1927                 *(p++)=0;
1928                 *(p++)=0;
1929                 *(p++)=0;
1930                 s->init_num += 4;
1931 #endif
1932
1933                 s->state = SSL3_ST_SW_CERT_REQ_B;
1934                 }
1935
1936         /* SSL3_ST_SW_CERT_REQ_B */
1937         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1938 err:
1939         return(-1);
1940         }
1941
1942 int ssl3_get_client_key_exchange(SSL *s)
1943         {
1944         int i,al,ok;
1945         long n;
1946         unsigned long alg_k;
1947         unsigned char *p;
1948 #ifndef OPENSSL_NO_RSA
1949         RSA *rsa=NULL;
1950         EVP_PKEY *pkey=NULL;
1951 #endif
1952 #ifndef OPENSSL_NO_DH
1953         BIGNUM *pub=NULL;
1954         DH *dh_srvr;
1955 #endif
1956 #ifndef OPENSSL_NO_KRB5
1957         KSSL_ERR kssl_err;
1958 #endif /* OPENSSL_NO_KRB5 */
1959
1960 #ifndef OPENSSL_NO_ECDH
1961         EC_KEY *srvr_ecdh = NULL;
1962         EVP_PKEY *clnt_pub_pkey = NULL;
1963         EC_POINT *clnt_ecpoint = NULL;
1964         BN_CTX *bn_ctx = NULL; 
1965 #endif
1966
1967         n=s->method->ssl_get_message(s,
1968                 SSL3_ST_SR_KEY_EXCH_A,
1969                 SSL3_ST_SR_KEY_EXCH_B,
1970                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1971                 2048, /* ??? */
1972                 &ok);
1973
1974         if (!ok) return((int)n);
1975         p=(unsigned char *)s->init_msg;
1976
1977         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1978
1979 #ifndef OPENSSL_NO_RSA
1980         if (alg_k & SSL_kRSA)
1981                 {
1982                 /* FIX THIS UP EAY EAY EAY EAY */
1983                 if (s->s3->tmp.use_rsa_tmp)
1984                         {
1985                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1986                                 rsa=s->cert->rsa_tmp;
1987                         /* Don't do a callback because rsa_tmp should
1988                          * be sent already */
1989                         if (rsa == NULL)
1990                                 {
1991                                 al=SSL_AD_HANDSHAKE_FAILURE;
1992                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1993                                 goto f_err;
1994
1995                                 }
1996                         }
1997                 else
1998                         {
1999                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2000                         if (    (pkey == NULL) ||
2001                                 (pkey->type != EVP_PKEY_RSA) ||
2002                                 (pkey->pkey.rsa == NULL))
2003                                 {
2004                                 al=SSL_AD_HANDSHAKE_FAILURE;
2005                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2006                                 goto f_err;
2007                                 }
2008                         rsa=pkey->pkey.rsa;
2009                         }
2010
2011                 /* TLS and [incidentally] DTLS{0xFEFF} */
2012                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2013                         {
2014                         n2s(p,i);
2015                         if (n != i+2)
2016                                 {
2017                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2018                                         {
2019                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2020                                         goto err;
2021                                         }
2022                                 else
2023                                         p-=2;
2024                                 }
2025                         else
2026                                 n=i;
2027                         }
2028
2029                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2030
2031                 al = -1;
2032                 
2033                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2034                         {
2035                         al=SSL_AD_DECODE_ERROR;
2036                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2037                         }
2038
2039                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2040                         {
2041                         /* The premaster secret must contain the same version number as the
2042                          * ClientHello to detect version rollback attacks (strangely, the
2043                          * protocol does not offer such protection for DH ciphersuites).
2044                          * However, buggy clients exist that send the negotiated protocol
2045                          * version instead if the server does not support the requested
2046                          * protocol version.
2047                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2048                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2049                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2050                                 {
2051                                 al=SSL_AD_DECODE_ERROR;
2052                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2053
2054                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2055                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2056                                  * number check as a "bad version oracle" -- an alert would
2057                                  * reveal that the plaintext corresponding to some ciphertext
2058                                  * made up by the adversary is properly formatted except
2059                                  * that the version number is wrong.  To avoid such attacks,
2060                                  * we should treat this just like any other decryption error. */
2061                                 }
2062                         }
2063
2064                 if (al != -1)
2065                         {
2066                         /* Some decryption failure -- use random value instead as countermeasure
2067                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2068                          * (see RFC 2246, section 7.4.7.1). */
2069                         ERR_clear_error();
2070                         i = SSL_MAX_MASTER_KEY_LENGTH;
2071                         p[0] = s->client_version >> 8;
2072                         p[1] = s->client_version & 0xff;
2073                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2074                                 goto err;
2075                         }
2076         
2077                 s->session->master_key_length=
2078                         s->method->ssl3_enc->generate_master_secret(s,
2079                                 s->session->master_key,
2080                                 p,i);
2081                 OPENSSL_cleanse(p,i);
2082                 }
2083         else
2084 #endif
2085 #ifndef OPENSSL_NO_DH
2086                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2087                 {
2088                 n2s(p,i);
2089                 if (n != i+2)
2090                         {
2091                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2092                                 {
2093                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2094                                 goto err;
2095                                 }
2096                         else
2097                                 {
2098                                 p-=2;
2099                                 i=(int)n;
2100                                 }
2101                         }
2102
2103                 if (n == 0L) /* the parameters are in the cert */
2104                         {
2105                         al=SSL_AD_HANDSHAKE_FAILURE;
2106                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2107                         goto f_err;
2108                         }
2109                 else
2110                         {
2111                         if (s->s3->tmp.dh == NULL)
2112                                 {
2113                                 al=SSL_AD_HANDSHAKE_FAILURE;
2114                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2115                                 goto f_err;
2116                                 }
2117                         else
2118                                 dh_srvr=s->s3->tmp.dh;
2119                         }
2120
2121                 pub=BN_bin2bn(p,i,NULL);
2122                 if (pub == NULL)
2123                         {
2124                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2125                         goto err;
2126                         }
2127
2128                 i=DH_compute_key(p,pub,dh_srvr);
2129
2130                 if (i <= 0)
2131                         {
2132                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2133                         goto err;
2134                         }
2135
2136                 DH_free(s->s3->tmp.dh);
2137                 s->s3->tmp.dh=NULL;
2138
2139                 BN_clear_free(pub);
2140                 pub=NULL;
2141                 s->session->master_key_length=
2142                         s->method->ssl3_enc->generate_master_secret(s,
2143                                 s->session->master_key,p,i);
2144                 OPENSSL_cleanse(p,i);
2145                 }
2146         else
2147 #endif
2148 #ifndef OPENSSL_NO_KRB5
2149         if (alg_k & SSL_kKRB5)
2150                 {
2151                 krb5_error_code         krb5rc;
2152                 krb5_data               enc_ticket;
2153                 krb5_data               authenticator;
2154                 krb5_data               enc_pms;
2155                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2156                 EVP_CIPHER_CTX          ciph_ctx;
2157                 const EVP_CIPHER        *enc = NULL;
2158                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2159                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2160                                                + EVP_MAX_BLOCK_LENGTH];
2161                 int                  padl, outl;
2162                 krb5_timestamp          authtime = 0;
2163                 krb5_ticket_times       ttimes;
2164
2165                 EVP_CIPHER_CTX_init(&ciph_ctx);
2166
2167                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2168
2169                 n2s(p,i);
2170                 enc_ticket.length = i;
2171
2172                 if (n < (long)(enc_ticket.length + 6))
2173                         {
2174                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2175                                 SSL_R_DATA_LENGTH_TOO_LONG);
2176                         goto err;
2177                         }
2178
2179                 enc_ticket.data = (char *)p;
2180                 p+=enc_ticket.length;
2181
2182                 n2s(p,i);
2183                 authenticator.length = i;
2184
2185                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2186                         {
2187                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2188                                 SSL_R_DATA_LENGTH_TOO_LONG);
2189                         goto err;
2190                         }
2191
2192                 authenticator.data = (char *)p;
2193                 p+=authenticator.length;
2194
2195                 n2s(p,i);
2196                 enc_pms.length = i;
2197                 enc_pms.data = (char *)p;
2198                 p+=enc_pms.length;
2199
2200                 /* Note that the length is checked again below,
2201                 ** after decryption
2202                 */
2203                 if(enc_pms.length > sizeof pms)
2204                         {
2205                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2206                                SSL_R_DATA_LENGTH_TOO_LONG);
2207                         goto err;
2208                         }
2209
2210                 if (n != (long)(enc_ticket.length + authenticator.length +
2211                                                 enc_pms.length + 6))
2212                         {
2213                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2214                                 SSL_R_DATA_LENGTH_TOO_LONG);
2215                         goto err;
2216                         }
2217
2218                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2219                                         &kssl_err)) != 0)
2220                         {
2221 #ifdef KSSL_DEBUG
2222                         printf("kssl_sget_tkt rtn %d [%d]\n",
2223                                 krb5rc, kssl_err.reason);
2224                         if (kssl_err.text)
2225                                 printf("kssl_err text= %s\n", kssl_err.text);
2226 #endif  /* KSSL_DEBUG */
2227                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2228                                 kssl_err.reason);
2229                         goto err;
2230                         }
2231
2232                 /*  Note: no authenticator is not considered an error,
2233                 **  but will return authtime == 0.
2234                 */
2235                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2236                                         &authtime, &kssl_err)) != 0)
2237                         {
2238 #ifdef KSSL_DEBUG
2239                         printf("kssl_check_authent rtn %d [%d]\n",
2240                                 krb5rc, kssl_err.reason);
2241                         if (kssl_err.text)
2242                                 printf("kssl_err text= %s\n", kssl_err.text);
2243 #endif  /* KSSL_DEBUG */
2244                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2245                                 kssl_err.reason);
2246                         goto err;
2247                         }
2248
2249                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2250                         {
2251                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2252                         goto err;
2253                         }
2254
2255 #ifdef KSSL_DEBUG
2256                 kssl_ctx_show(kssl_ctx);
2257 #endif  /* KSSL_DEBUG */
2258
2259                 enc = kssl_map_enc(kssl_ctx->enctype);
2260                 if (enc == NULL)
2261                     goto err;
2262
2263                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2264
2265                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2266                         {
2267                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2268                                 SSL_R_DECRYPTION_FAILED);
2269                         goto err;
2270                         }
2271                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2272                                         (unsigned char *)enc_pms.data, enc_pms.length))
2273                         {
2274                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2275                                 SSL_R_DECRYPTION_FAILED);
2276                         goto err;
2277                         }
2278                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2279                         {
2280                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2281                                 SSL_R_DATA_LENGTH_TOO_LONG);
2282                         goto err;
2283                         }
2284                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2285                         {
2286                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2287                                 SSL_R_DECRYPTION_FAILED);
2288                         goto err;
2289                         }
2290                 outl += padl;
2291                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2292                         {
2293                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2294                                 SSL_R_DATA_LENGTH_TOO_LONG);
2295                         goto err;
2296                         }
2297                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2298                     {
2299                     /* The premaster secret must contain the same version number as the
2300                      * ClientHello to detect version rollback attacks (strangely, the
2301                      * protocol does not offer such protection for DH ciphersuites).
2302                      * However, buggy clients exist that send random bytes instead of
2303                      * the protocol version.
2304                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2305                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2306                      */
2307                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2308                         {
2309                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2310                                SSL_AD_DECODE_ERROR);
2311                         goto err;
2312                         }
2313                     }
2314
2315                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2316
2317                 s->session->master_key_length=
2318                         s->method->ssl3_enc->generate_master_secret(s,
2319                                 s->session->master_key, pms, outl);
2320
2321                 if (kssl_ctx->client_princ)
2322                         {
2323                         size_t len = strlen(kssl_ctx->client_princ);
2324                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2325                                 {
2326                                 s->session->krb5_client_princ_len = len;
2327                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2328                                 }
2329                         }
2330
2331
2332                 /*  Was doing kssl_ctx_free() here,
2333                 **  but it caused problems for apache.
2334                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2335                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2336                 */
2337                 }
2338         else
2339 #endif  /* OPENSSL_NO_KRB5 */
2340
2341 #ifndef OPENSSL_NO_ECDH
2342                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2343                 {
2344                 int ret = 1;
2345                 int field_size = 0;
2346                 const EC_KEY   *tkey;
2347                 const EC_GROUP *group;
2348                 const BIGNUM *priv_key;
2349
2350                 /* initialize structures for server's ECDH key pair */
2351                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2352                         {
2353                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2354                             ERR_R_MALLOC_FAILURE);
2355                         goto err;
2356                         }
2357
2358                 /* Let's get server private key and group information */
2359                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2360                         { 
2361                         /* use the certificate */
2362                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2363                         }
2364                 else
2365                         {
2366                         /* use the ephermeral values we saved when
2367                          * generating the ServerKeyExchange msg.
2368                          */
2369                         tkey = s->s3->tmp.ecdh;
2370                         }
2371
2372                 group    = EC_KEY_get0_group(tkey);
2373                 priv_key = EC_KEY_get0_private_key(tkey);
2374
2375                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2376                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2377                         {
2378                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2379                                ERR_R_EC_LIB);
2380                         goto err;
2381                         }
2382
2383                 /* Let's get client's public key */
2384                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2385                         {
2386                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2387                             ERR_R_MALLOC_FAILURE);
2388                         goto err;
2389                         }
2390
2391                 if (n == 0L) 
2392                         {
2393                         /* Client Publickey was in Client Certificate */
2394
2395                          if (alg_k & SSL_kEECDH)
2396                                  {
2397                                  al=SSL_AD_HANDSHAKE_FAILURE;
2398                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2399                                  goto f_err;
2400                                  }
2401                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2402                             == NULL) || 
2403                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2404                                 {
2405                                 /* XXX: For now, we do not support client
2406                                  * authentication using ECDH certificates
2407                                  * so this branch (n == 0L) of the code is
2408                                  * never executed. When that support is
2409                                  * added, we ought to ensure the key 
2410                                  * received in the certificate is 
2411                                  * authorized for key agreement.
2412                                  * ECDH_compute_key implicitly checks that
2413                                  * the two ECDH shares are for the same
2414                                  * group.
2415                                  */
2416                                 al=SSL_AD_HANDSHAKE_FAILURE;
2417                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2418                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2419                                 goto f_err;
2420                                 }
2421
2422                         if (EC_POINT_copy(clnt_ecpoint,
2423                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2424                                 {
2425                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2426                                         ERR_R_EC_LIB);
2427                                 goto err;
2428                                 }
2429                         ret = 2; /* Skip certificate verify processing */
2430                         }
2431                 else
2432                         {
2433                         /* Get client's public key from encoded point
2434                          * in the ClientKeyExchange message.
2435                          */
2436                         if ((bn_ctx = BN_CTX_new()) == NULL)
2437                                 {
2438                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2439                                     ERR_R_MALLOC_FAILURE);
2440                                 goto err;
2441                                 }
2442
2443                         /* Get encoded point length */
2444                         i = *p; 
2445                         p += 1;
2446                         if (n != 1 + i)
2447                                 {
2448                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2449                                     ERR_R_EC_LIB);
2450                                 goto err;
2451                                 }
2452                         if (EC_POINT_oct2point(group, 
2453                             clnt_ecpoint, p, i, bn_ctx) == 0)
2454                                 {
2455                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2456                                     ERR_R_EC_LIB);
2457                                 goto err;
2458                                 }
2459                         /* p is pointing to somewhere in the buffer
2460                          * currently, so set it to the start 
2461                          */ 
2462                         p=(unsigned char *)s->init_buf->data;
2463                         }
2464
2465                 /* Compute the shared pre-master secret */
2466                 field_size = EC_GROUP_get_degree(group);
2467                 if (field_size <= 0)
2468                         {
2469                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2470                                ERR_R_ECDH_LIB);
2471                         goto err;
2472                         }
2473                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2474                 if (i <= 0)
2475                         {
2476                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2477                             ERR_R_ECDH_LIB);
2478                         goto err;
2479                         }
2480
2481                 EVP_PKEY_free(clnt_pub_pkey);
2482                 EC_POINT_free(clnt_ecpoint);
2483                 EC_KEY_free(srvr_ecdh);
2484                 BN_CTX_free(bn_ctx);
2485                 EC_KEY_free(s->s3->tmp.ecdh);
2486                 s->s3->tmp.ecdh = NULL; 
2487
2488                 /* Compute the master secret */
2489                 s->session->master_key_length = s->method->ssl3_enc-> \
2490                     generate_master_secret(s, s->session->master_key, p, i);
2491                 
2492                 OPENSSL_cleanse(p, i);
2493                 return (ret);
2494                 }
2495         else
2496 #endif
2497 #ifndef OPENSSL_NO_PSK
2498                 if (alg_k & SSL_kPSK)
2499                         {
2500                         unsigned char *t = NULL;
2501                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2502                         unsigned int pre_ms_len = 0, psk_len = 0;
2503                         int psk_err = 1;
2504                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2505
2506                         al=SSL_AD_HANDSHAKE_FAILURE;
2507
2508                         n2s(p,i);
2509                         if (n != i+2)
2510                                 {
2511                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2512                                         SSL_R_LENGTH_MISMATCH);
2513                                 goto psk_err;
2514                                 }
2515                         if (i > PSK_MAX_IDENTITY_LEN)
2516                                 {
2517                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2518                                         SSL_R_DATA_LENGTH_TOO_LONG);
2519                                 goto psk_err;
2520                                 }
2521                         if (s->psk_server_callback == NULL)
2522                                 {
2523                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2524                                        SSL_R_PSK_NO_SERVER_CB);
2525                                 goto psk_err;
2526                                 }
2527
2528                         /* Create guaranteed NULL-terminated identity
2529                          * string for the callback */
2530                         memcpy(tmp_id, p, i);
2531                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2532                         psk_len = s->psk_server_callback(s, tmp_id,
2533                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2534                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2535
2536                         if (psk_len > PSK_MAX_PSK_LEN)
2537                                 {
2538                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2539                                         ERR_R_INTERNAL_ERROR);
2540                                 goto psk_err;
2541                                 }
2542                         else if (psk_len == 0)
2543                                 {
2544                                 /* PSK related to the given identity not found */
2545                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2546                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2547                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2548                                 goto psk_err;
2549                                 }
2550
2551                         /* create PSK pre_master_secret */
2552                         pre_ms_len=2+psk_len+2+psk_len;
2553                         t = psk_or_pre_ms;
2554                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2555                         s2n(psk_len, t);
2556                         memset(t, 0, psk_len);
2557                         t+=psk_len;
2558                         s2n(psk_len, t);
2559
2560                         if (s->session->psk_identity != NULL)
2561                                 OPENSSL_free(s->session->psk_identity);
2562                         s->session->psk_identity = BUF_strdup((char *)p);
2563                         if (s->session->psk_identity == NULL)
2564                                 {
2565                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2566                                         ERR_R_MALLOC_FAILURE);
2567                                 goto psk_err;
2568                                 }
2569
2570                         if (s->session->psk_identity_hint != NULL)
2571                                 OPENSSL_free(s->session->psk_identity_hint);
2572                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2573                         if (s->ctx->psk_identity_hint != NULL &&
2574                                 s->session->psk_identity_hint == NULL)
2575                                 {
2576                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2577                                         ERR_R_MALLOC_FAILURE);
2578                                 goto psk_err;
2579                                 }
2580
2581                         s->session->master_key_length=
2582                                 s->method->ssl3_enc->generate_master_secret(s,
2583                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2584                         psk_err = 0;
2585                 psk_err:
2586                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2587                         if (psk_err != 0)
2588                                 goto f_err;
2589                         }
2590                 else
2591 #endif
2592                 if (alg_k & SSL_kGOST) 
2593                         {
2594                         int ret = 0;
2595                         EVP_PKEY_CTX *pkey_ctx;
2596                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2597                         unsigned char premaster_secret[32], *start;
2598                         size_t outlen=32, inlen;
2599                         unsigned long alg_a;
2600
2601                         /* Get our certificate private key*/
2602                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2603                         if (alg_a & SSL_aGOST94)
2604                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2605                         else if (alg_a & SSL_aGOST01)
2606                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2607
2608                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2609                         EVP_PKEY_decrypt_init(pkey_ctx);
2610                         /* If client certificate is present and is of the same type, maybe
2611                          * use it for key exchange.  Don't mind errors from
2612                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2613                          * a client certificate for authorization only. */
2614                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2615                         if (client_pub_pkey)
2616                                 {
2617                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2618                                         ERR_clear_error();
2619                                 }
2620                         /* Decrypt session key */
2621                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2622                                 {
2623                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2624                                 goto gerr;
2625                                 }
2626                         if (p[1] == 0x81)
2627                                 {
2628                                 start = p+3;
2629                                 inlen = p[2];
2630                                 }
2631                         else if (p[1] < 0x80)
2632                                 {
2633                                 start = p+2;
2634                                 inlen = p[1];
2635                                 }
2636                         else
2637                                 {
2638                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2639                                 goto gerr;
2640                                 }
2641                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2642
2643                                 {
2644                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2645                                 goto gerr;
2646                                 }
2647                         /* Generate master secret */
2648                         s->session->master_key_length=
2649                                 s->method->ssl3_enc->generate_master_secret(s,
2650                                         s->session->master_key,premaster_secret,32);
2651                         /* Check if pubkey from client certificate was used */
2652                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2653                                 ret = 2;
2654                         else
2655                                 ret = 1;
2656                 gerr:
2657                         EVP_PKEY_free(client_pub_pkey);
2658                         EVP_PKEY_CTX_free(pkey_ctx);
2659                         if (ret)
2660                                 return ret;
2661                         else
2662                                 goto err;
2663                         }
2664                 else
2665                 {
2666                 al=SSL_AD_HANDSHAKE_FAILURE;
2667                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2668                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2669                 goto f_err;
2670                 }
2671
2672         return(1);
2673 f_err:
2674         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2675 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2676 err:
2677 #endif
2678 #ifndef OPENSSL_NO_ECDH
2679         EVP_PKEY_free(clnt_pub_pkey);
2680         EC_POINT_free(clnt_ecpoint);
2681         if (srvr_ecdh != NULL) 
2682                 EC_KEY_free(srvr_ecdh);
2683         BN_CTX_free(bn_ctx);
2684 #endif
2685         return(-1);
2686         }
2687
2688 int ssl3_get_cert_verify(SSL *s)
2689         {
2690         EVP_PKEY *pkey=NULL;
2691         unsigned char *p;
2692         int al,ok,ret=0;
2693         long n;
2694         int type=0,i,j;
2695         X509 *peer;
2696
2697         n=s->method->ssl_get_message(s,
2698                 SSL3_ST_SR_CERT_VRFY_A,
2699                 SSL3_ST_SR_CERT_VRFY_B,
2700                 -1,
2701                 514, /* 514? */
2702                 &ok);
2703
2704         if (!ok) return((int)n);
2705
2706         if (s->session->peer != NULL)
2707                 {
2708                 peer=s->session->peer;
2709                 pkey=X509_get_pubkey(peer);
2710                 type=X509_certificate_type(peer,pkey);
2711                 }
2712         else
2713                 {
2714                 peer=NULL;
2715                 pkey=NULL;
2716                 }
2717
2718         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2719                 {
2720                 s->s3->tmp.reuse_message=1;
2721                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2722                         {
2723                         al=SSL_AD_UNEXPECTED_MESSAGE;
2724                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2725                         goto f_err;
2726                         }
2727                 ret=1;
2728                 goto end;
2729                 }
2730
2731         if (peer == NULL)
2732                 {
2733                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2734                 al=SSL_AD_UNEXPECTED_MESSAGE;
2735                 goto f_err;
2736                 }
2737
2738         if (!(type & EVP_PKT_SIGN))
2739                 {
2740                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2741                 al=SSL_AD_ILLEGAL_PARAMETER;
2742                 goto f_err;
2743                 }
2744
2745         if (s->s3->change_cipher_spec)
2746                 {
2747                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2748                 al=SSL_AD_UNEXPECTED_MESSAGE;
2749                 goto f_err;
2750                 }
2751
2752         /* we now have a signature that we need to verify */
2753         p=(unsigned char *)s->init_msg;
2754         /* Check for broken implementations of GOST ciphersuites */
2755         /* If key is GOST and n is exactly 64, it is bare
2756          * signature without length field */
2757         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2758                 pkey->type == NID_id_GostR3410_2001) )
2759                 {
2760                 i=64;
2761                 } 
2762         else 
2763                 {       
2764                 n2s(p,i);
2765                 n-=2;
2766                 if (i > n)
2767                         {
2768                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2769                         al=SSL_AD_DECODE_ERROR;
2770                         goto f_err;
2771                         }
2772         }
2773         j=EVP_PKEY_size(pkey);
2774         if ((i > j) || (n > j) || (n <= 0))
2775                 {
2776                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2777                 al=SSL_AD_DECODE_ERROR;
2778                 goto f_err;
2779                 }
2780
2781 #ifndef OPENSSL_NO_RSA 
2782         if (pkey->type == EVP_PKEY_RSA)
2783                 {
2784                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2785                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
2786                                                         pkey->pkey.rsa);
2787                 if (i < 0)
2788                         {
2789                         al=SSL_AD_DECRYPT_ERROR;
2790                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2791                         goto f_err;
2792                         }
2793                 if (i == 0)
2794                         {
2795                         al=SSL_AD_DECRYPT_ERROR;
2796                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2797                         goto f_err;
2798                         }
2799                 }
2800         else
2801 #endif
2802 #ifndef OPENSSL_NO_DSA
2803                 if (pkey->type == EVP_PKEY_DSA)
2804                 {
2805                 j=DSA_verify(pkey->save_type,
2806                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2807                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2808                 if (j <= 0)
2809                         {
2810                         /* bad signature */
2811                         al=SSL_AD_DECRYPT_ERROR;
2812                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2813                         goto f_err;
2814                         }
2815                 }
2816         else
2817 #endif
2818 #ifndef OPENSSL_NO_ECDSA
2819                 if (pkey->type == EVP_PKEY_EC)
2820                 {
2821                 j=ECDSA_verify(pkey->save_type,
2822                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2823                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2824                 if (j <= 0)
2825                         {
2826                         /* bad signature */
2827                         al=SSL_AD_DECRYPT_ERROR;
2828                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2829                             SSL_R_BAD_ECDSA_SIGNATURE);
2830                         goto f_err;
2831                         }
2832                 }
2833         else
2834 #endif
2835         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2836                 {   unsigned char signature[64];
2837                         int idx;
2838                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2839                         EVP_PKEY_verify_init(pctx);
2840                         if (i!=64) {
2841                                 fprintf(stderr,"GOST signature length is %d",i);
2842                         }       
2843                         for (idx=0;idx<64;idx++) {
2844                                 signature[63-idx]=p[idx];
2845                         }       
2846                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2847                         EVP_PKEY_CTX_free(pctx);
2848                         if (j<=0) 
2849                                 {
2850                                 al=SSL_AD_DECRYPT_ERROR;
2851                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2852                                         SSL_R_BAD_ECDSA_SIGNATURE);
2853                                 goto f_err;
2854                                 }       
2855                 }
2856         else    
2857                 {
2858                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2859                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2860                 goto f_err;
2861                 }
2862
2863
2864         ret=1;
2865         if (0)
2866                 {
2867 f_err:
2868                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2869                 }
2870 end:
2871         EVP_PKEY_free(pkey);
2872         return(ret);
2873         }
2874
2875 int ssl3_get_client_certificate(SSL *s)
2876         {
2877         int i,ok,al,ret= -1;
2878         X509 *x=NULL;
2879         unsigned long l,nc,llen,n;
2880         const unsigned char *p,*q;
2881         unsigned char *d;
2882         STACK_OF(X509) *sk=NULL;
2883
2884         n=s->method->ssl_get_message(s,
2885                 SSL3_ST_SR_CERT_A,
2886                 SSL3_ST_SR_CERT_B,
2887                 -1,
2888                 s->max_cert_list,
2889                 &ok);
2890
2891         if (!ok) return((int)n);
2892
2893         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2894                 {
2895                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2896                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2897                         {
2898                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2899                         al=SSL_AD_HANDSHAKE_FAILURE;
2900                         goto f_err;
2901                         }
2902                 /* If tls asked for a client cert, the client must return a 0 list */
2903                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2904                         {
2905                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2906                         al=SSL_AD_UNEXPECTED_MESSAGE;
2907                         goto f_err;
2908                         }
2909                 s->s3->tmp.reuse_message=1;
2910                 return(1);
2911                 }
2912
2913         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2914                 {
2915                 al=SSL_AD_UNEXPECTED_MESSAGE;
2916                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2917                 goto f_err;
2918                 }
2919         p=d=(unsigned char *)s->init_msg;
2920
2921         if ((sk=sk_X509_new_null()) == NULL)
2922                 {
2923                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2924                 goto err;
2925                 }
2926
2927         n2l3(p,llen);
2928         if (llen+3 != n)
2929                 {
2930                 al=SSL_AD_DECODE_ERROR;
2931                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2932                 goto f_err;
2933                 }
2934         for (nc=0; nc<llen; )
2935                 {
2936                 n2l3(p,l);
2937                 if ((l+nc+3) > llen)
2938                         {
2939                         al=SSL_AD_DECODE_ERROR;
2940                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2941                         goto f_err;
2942                         }
2943
2944                 q=p;
2945                 x=d2i_X509(NULL,&p,l);
2946                 if (x == NULL)
2947                         {
2948                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2949                         goto err;
2950                         }
2951                 if (p != (q+l))
2952                         {
2953                         al=SSL_AD_DECODE_ERROR;
2954                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2955                         goto f_err;
2956                         }
2957                 if (!sk_X509_push(sk,x))
2958                         {
2959                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2960                         goto err;
2961                         }
2962                 x=NULL;
2963                 nc+=l+3;
2964                 }
2965
2966         if (sk_X509_num(sk) <= 0)
2967                 {
2968                 /* TLS does not mind 0 certs returned */
2969                 if (s->version == SSL3_VERSION)
2970                         {
2971                         al=SSL_AD_HANDSHAKE_FAILURE;
2972                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2973                         goto f_err;
2974                         }
2975                 /* Fail for TLS only if we required a certificate */
2976                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2977                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2978                         {
2979                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2980                         al=SSL_AD_HANDSHAKE_FAILURE;
2981                         goto f_err;
2982                         }
2983                 }
2984         else
2985                 {
2986                 i=ssl_verify_cert_chain(s,sk);
2987                 if (i <= 0)
2988                         {
2989                         al=ssl_verify_alarm_type(s->verify_result);
2990                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2991                         goto f_err;
2992                         }
2993                 }
2994
2995         if (s->session->peer != NULL) /* This should not be needed */
2996                 X509_free(s->session->peer);
2997         s->session->peer=sk_X509_shift(sk);
2998         s->session->verify_result = s->verify_result;
2999
3000         /* With the current implementation, sess_cert will always be NULL
3001          * when we arrive here. */
3002         if (s->session->sess_cert == NULL)
3003                 {
3004                 s->session->sess_cert = ssl_sess_cert_new();
3005                 if (s->session->sess_cert == NULL)
3006                         {
3007                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3008                         goto err;
3009                         }
3010                 }
3011         if (s->session->sess_cert->cert_chain != NULL)
3012                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3013         s->session->sess_cert->cert_chain=sk;
3014         /* Inconsistency alert: cert_chain does *not* include the
3015          * peer's own certificate, while we do include it in s3_clnt.c */
3016
3017         sk=NULL;
3018
3019         ret=1;
3020         if (0)
3021                 {
3022 f_err:
3023                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3024                 }
3025 err:
3026         if (x != NULL) X509_free(x);
3027         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3028         return(ret);
3029         }
3030
3031 int ssl3_send_server_certificate(SSL *s)
3032         {
3033         unsigned long l;
3034         X509 *x;
3035
3036         if (s->state == SSL3_ST_SW_CERT_A)
3037                 {
3038                 x=ssl_get_server_send_cert(s);
3039                 if (x == NULL)
3040                         {
3041                         /* VRS: allow null cert if auth == KRB5 */
3042                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3043                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3044                                 {
3045                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3046                                 return(0);
3047                                 }
3048                         }
3049
3050                 l=ssl3_output_cert_chain(s,x);
3051                 s->state=SSL3_ST_SW_CERT_B;
3052                 s->init_num=(int)l;
3053                 s->init_off=0;
3054                 }
3055
3056         /* SSL3_ST_SW_CERT_B */
3057         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3058         }
3059 #ifndef OPENSSL_NO_TLSEXT
3060 int ssl3_send_newsession_ticket(SSL *s)
3061         {
3062         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3063                 {
3064                 unsigned char *p, *senc, *macstart;
3065                 int len, slen;
3066                 unsigned int hlen;
3067                 EVP_CIPHER_CTX ctx;
3068                 HMAC_CTX hctx;
3069                 SSL_CTX *tctx = s->initial_ctx;
3070                 unsigned char iv[EVP_MAX_IV_LENGTH];
3071                 unsigned char key_name[16];
3072
3073                 /* get session encoding length */
3074                 slen = i2d_SSL_SESSION(s->session, NULL);
3075                 /* Some length values are 16 bits, so forget it if session is
3076                  * too long
3077                  */
3078                 if (slen > 0xFF00)
3079                         return -1;
3080                 /* Grow buffer if need be: the length calculation is as
3081                  * follows 1 (size of message name) + 3 (message length
3082                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3083                  * 16 (key name) + max_iv_len (iv length) +
3084                  * session_length + max_enc_block_size (max encrypted session
3085                  * length) + max_md_size (HMAC).
3086                  */
3087                 if (!BUF_MEM_grow(s->init_buf,
3088                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3089                         EVP_MAX_MD_SIZE + slen))
3090                         return -1;
3091                 senc = OPENSSL_malloc(slen);
3092                 if (!senc)
3093                         return -1;
3094                 p = senc;
3095                 i2d_SSL_SESSION(s->session, &p);
3096
3097                 p=(unsigned char *)s->init_buf->data;
3098                 /* do the header */
3099                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3100                 /* Skip message length for now */
3101                 p += 3;
3102                 EVP_CIPHER_CTX_init(&ctx);
3103                 HMAC_CTX_init(&hctx);
3104                 /* Initialize HMAC and cipher contexts. If callback present
3105                  * it does all the work otherwise use generated values
3106                  * from parent ctx.
3107                  */
3108                 if (tctx->tlsext_ticket_key_cb)
3109                         {
3110                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3111                                                          &hctx, 1) < 0)
3112                                 {
3113                                 OPENSSL_free(senc);
3114                                 return -1;
3115                                 }
3116                         }
3117                 else
3118                         {
3119                         RAND_pseudo_bytes(iv, 16);
3120                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3121                                         tctx->tlsext_tick_aes_key, iv);
3122                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3123                                         tlsext_tick_md(), NULL);
3124                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3125                         }
3126                 l2n(s->session->tlsext_tick_lifetime_hint, p);
3127                 /* Skip ticket length for now */
3128                 p += 2;
3129                 /* Output key name */
3130                 macstart = p;
3131                 memcpy(p, key_name, 16);
3132                 p += 16;
3133                 /* output IV */
3134                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3135                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3136                 /* Encrypt session data */
3137                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3138                 p += len;
3139                 EVP_EncryptFinal(&ctx, p, &len);
3140                 p += len;
3141                 EVP_CIPHER_CTX_cleanup(&ctx);
3142
3143                 HMAC_Update(&hctx, macstart, p - macstart);
3144                 HMAC_Final(&hctx, p, &hlen);
3145                 HMAC_CTX_cleanup(&hctx);
3146
3147                 p += hlen;
3148                 /* Now write out lengths: p points to end of data written */
3149                 /* Total length */
3150                 len = p - (unsigned char *)s->init_buf->data;
3151                 p=(unsigned char *)s->init_buf->data + 1;
3152                 l2n3(len - 4, p); /* Message length */
3153                 p += 4;
3154                 s2n(len - 10, p);  /* Ticket length */
3155
3156                 /* number of bytes to write */
3157                 s->init_num= len;
3158                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3159                 s->init_off=0;
3160                 OPENSSL_free(senc);
3161                 }
3162
3163         /* SSL3_ST_SW_SESSION_TICKET_B */
3164         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3165         }
3166
3167 int ssl3_send_cert_status(SSL *s)
3168         {
3169         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3170                 {
3171                 unsigned char *p;
3172                 /* Grow buffer if need be: the length calculation is as
3173                  * follows 1 (message type) + 3 (message length) +
3174                  * 1 (ocsp response type) + 3 (ocsp response length)
3175                  * + (ocsp response)
3176                  */
3177                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3178                         return -1;
3179
3180                 p=(unsigned char *)s->init_buf->data;
3181
3182                 /* do the header */
3183                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3184                 /* message length */
3185                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3186                 /* status type */
3187                 *(p++)= s->tlsext_status_type;
3188                 /* length of OCSP response */
3189                 l2n3(s->tlsext_ocsp_resplen, p);
3190                 /* actual response */
3191                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3192                 /* number of bytes to write */
3193                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3194                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3195                 s->init_off = 0;
3196                 }
3197
3198         /* SSL3_ST_SW_CERT_STATUS_B */
3199         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3200         }
3201 #endif