Add Next Protocol Negotiation.
[openssl.git] / 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 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NPN)
542                                 s->state=SSL3_ST_SR_FINISHED_A;
543 #else
544                                 if (s->s3->next_proto_neg_seen)
545                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
546                                 else
547                                         s->state=SSL3_ST_SR_FINISHED_A;
548 #endif
549                                 s->init_num = 0;
550                                 }
551                         else
552                                 {
553                                 int offset=0;
554                                 int dgst_num;
555
556                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
557                                 s->init_num=0;
558
559                                 /* We need to get hashes here so if there is
560                                  * a client cert, it can be verified
561                                  * FIXME - digest processing for CertificateVerify
562                                  * should be generalized. But it is next step
563                                  */
564                                 if (s->s3->handshake_buffer)
565                                         if (!ssl3_digest_cached_records(s))
566                                                 return -1;
567                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
568                                         if (s->s3->handshake_dgst[dgst_num]) 
569                                                 {
570                                                 int dgst_size;
571
572                                                 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]));
573                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
574                                                 if (dgst_size < 0)
575                                                         {
576                                                         ret = -1;
577                                                         goto end;
578                                                         }
579                                                 offset+=dgst_size;
580                                                 }               
581                                 }
582                         break;
583
584                 case SSL3_ST_SR_CERT_VRFY_A:
585                 case SSL3_ST_SR_CERT_VRFY_B:
586
587                         /* we should decide if we expected this one */
588                         ret=ssl3_get_cert_verify(s);
589                         if (ret <= 0) goto end;
590
591 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NPN)
592                         s->state=SSL3_ST_SR_FINISHED_A;
593 #else
594                         if (s->s3->next_proto_neg_seen)
595                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
596                         else
597                                 s->state=SSL3_ST_SR_FINISHED_A;
598 #endif
599                         s->init_num=0;
600                         break;
601
602 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NPN)
603                 case SSL3_ST_SR_NEXT_PROTO_A:
604                 case SSL3_ST_SR_NEXT_PROTO_B:
605                         ret=ssl3_get_next_proto(s);
606                         if (ret <= 0) goto end;
607                         s->init_num = 0;
608                         s->state=SSL3_ST_SR_FINISHED_A;
609                         break;
610 #endif
611
612                 case SSL3_ST_SR_FINISHED_A:
613                 case SSL3_ST_SR_FINISHED_B:
614                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
615                                 SSL3_ST_SR_FINISHED_B);
616                         if (ret <= 0) goto end;
617 #ifndef OPENSSL_NO_TLSEXT
618                         if (s->tlsext_ticket_expected)
619                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
620                         else if (s->hit)
621                                 s->state=SSL_ST_OK;
622 #else
623                         if (s->hit)
624                                 s->state=SSL_ST_OK;
625 #endif
626                         else
627                                 s->state=SSL3_ST_SW_CHANGE_A;
628                         s->init_num=0;
629                         break;
630
631 #ifndef OPENSSL_NO_TLSEXT
632                 case SSL3_ST_SW_SESSION_TICKET_A:
633                 case SSL3_ST_SW_SESSION_TICKET_B:
634                         ret=ssl3_send_newsession_ticket(s);
635                         if (ret <= 0) goto end;
636                         s->state=SSL3_ST_SW_CHANGE_A;
637                         s->init_num=0;
638                         break;
639
640                 case SSL3_ST_SW_CERT_STATUS_A:
641                 case SSL3_ST_SW_CERT_STATUS_B:
642                         ret=ssl3_send_cert_status(s);
643                         if (ret <= 0) goto end;
644                         s->state=SSL3_ST_SW_KEY_EXCH_A;
645                         s->init_num=0;
646                         break;
647
648 #endif
649
650                 case SSL3_ST_SW_CHANGE_A:
651                 case SSL3_ST_SW_CHANGE_B:
652
653                         s->session->cipher=s->s3->tmp.new_cipher;
654                         if (!s->method->ssl3_enc->setup_key_block(s))
655                                 { ret= -1; goto end; }
656
657                         ret=ssl3_send_change_cipher_spec(s,
658                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
659
660                         if (ret <= 0) goto end;
661                         s->state=SSL3_ST_SW_FINISHED_A;
662                         s->init_num=0;
663
664                         if (!s->method->ssl3_enc->change_cipher_state(s,
665                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
666                                 {
667                                 ret= -1;
668                                 goto end;
669                                 }
670
671                         break;
672
673                 case SSL3_ST_SW_FINISHED_A:
674                 case SSL3_ST_SW_FINISHED_B:
675                         ret=ssl3_send_finished(s,
676                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
677                                 s->method->ssl3_enc->server_finished_label,
678                                 s->method->ssl3_enc->server_finished_label_len);
679                         if (ret <= 0) goto end;
680                         s->state=SSL3_ST_SW_FLUSH;
681                         if (s->hit)
682                                 {
683 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NPN)
684                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
685 #else
686                                 if (s->s3->next_proto_neg_seen)
687                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
688                                 else
689                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
690 #endif
691                                 }
692                         else
693                                 s->s3->tmp.next_state=SSL_ST_OK;
694                         s->init_num=0;
695                         break;
696
697                 case SSL_ST_OK:
698                         /* clean a few things up */
699                         ssl3_cleanup_key_block(s);
700
701                         BUF_MEM_free(s->init_buf);
702                         s->init_buf=NULL;
703
704                         /* remove buffering on output */
705                         ssl_free_wbio_buffer(s);
706
707                         s->init_num=0;
708
709                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
710                                 {
711                                 /* actually not necessarily a 'new' session unless
712                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
713                                 
714                                 s->new_session=0;
715                                 
716                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
717                                 
718                                 s->ctx->stats.sess_accept_good++;
719                                 /* s->server=1; */
720                                 s->handshake_func=ssl3_accept;
721
722                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
723                                 }
724                         
725                         ret = 1;
726                         goto end;
727                         /* break; */
728
729                 default:
730                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
731                         ret= -1;
732                         goto end;
733                         /* break; */
734                         }
735                 
736                 if (!s->s3->tmp.reuse_message && !skip)
737                         {
738                         if (s->debug)
739                                 {
740                                 if ((ret=BIO_flush(s->wbio)) <= 0)
741                                         goto end;
742                                 }
743
744
745                         if ((cb != NULL) && (s->state != state))
746                                 {
747                                 new_state=s->state;
748                                 s->state=state;
749                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
750                                 s->state=new_state;
751                                 }
752                         }
753                 skip=0;
754                 }
755 end:
756         /* BIO_flush(s->wbio); */
757
758         s->in_handshake--;
759         if (cb != NULL)
760                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
761         return(ret);
762         }
763
764 int ssl3_send_hello_request(SSL *s)
765         {
766         unsigned char *p;
767
768         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
769                 {
770                 p=(unsigned char *)s->init_buf->data;
771                 *(p++)=SSL3_MT_HELLO_REQUEST;
772                 *(p++)=0;
773                 *(p++)=0;
774                 *(p++)=0;
775
776                 s->state=SSL3_ST_SW_HELLO_REQ_B;
777                 /* number of bytes to write */
778                 s->init_num=4;
779                 s->init_off=0;
780                 }
781
782         /* SSL3_ST_SW_HELLO_REQ_B */
783         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
784         }
785
786 int ssl3_check_client_hello(SSL *s)
787         {
788         int ok;
789         long n;
790
791         /* this function is called when we really expect a Certificate message,
792          * so permit appropriate message length */
793         n=s->method->ssl_get_message(s,
794                 SSL3_ST_SR_CERT_A,
795                 SSL3_ST_SR_CERT_B,
796                 -1,
797                 s->max_cert_list,
798                 &ok);
799         if (!ok) return((int)n);
800         s->s3->tmp.reuse_message = 1;
801         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
802                 {
803                 /* Throw away what we have done so far in the current handshake,
804                  * which will now be aborted. (A full SSL_clear would be too much.)
805                  * I hope that tmp.dh is the only thing that may need to be cleared
806                  * when a handshake is not completed ... */
807 #ifndef OPENSSL_NO_DH
808                 if (s->s3->tmp.dh != NULL)
809                         {
810                         DH_free(s->s3->tmp.dh);
811                         s->s3->tmp.dh = NULL;
812                         }
813 #endif
814                 return 2;
815                 }
816         return 1;
817 }
818
819 int ssl3_get_client_hello(SSL *s)
820         {
821         int i,j,ok,al,ret= -1;
822         unsigned int cookie_len;
823         long n;
824         unsigned long id;
825         unsigned char *p,*d,*q;
826         SSL_CIPHER *c;
827 #ifndef OPENSSL_NO_COMP
828         SSL_COMP *comp=NULL;
829 #endif
830         STACK_OF(SSL_CIPHER) *ciphers=NULL;
831
832         /* We do this so that we will respond with our native type.
833          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
834          * This down switching should be handled by a different method.
835          * If we are SSLv3, we will respond with SSLv3, even if prompted with
836          * TLSv1.
837          */
838         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
839                 {
840                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
841                 }
842         s->first_packet=1;
843         n=s->method->ssl_get_message(s,
844                 SSL3_ST_SR_CLNT_HELLO_B,
845                 SSL3_ST_SR_CLNT_HELLO_C,
846                 SSL3_MT_CLIENT_HELLO,
847                 SSL3_RT_MAX_PLAIN_LENGTH,
848                 &ok);
849
850         if (!ok) return((int)n);
851         s->first_packet=0;
852         d=p=(unsigned char *)s->init_msg;
853
854         /* use version from inside client hello, not from record header
855          * (may differ: see RFC 2246, Appendix E, second paragraph) */
856         s->client_version=(((int)p[0])<<8)|(int)p[1];
857         p+=2;
858
859         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
860             (s->version != DTLS1_VERSION && s->client_version < s->version))
861                 {
862                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
863                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
864                         {
865                         /* similar to ssl3_get_record, send alert using remote version number */
866                         s->version = s->client_version;
867                         }
868                 al = SSL_AD_PROTOCOL_VERSION;
869                 goto f_err;
870                 }
871
872         /* If we require cookies and this ClientHello doesn't
873          * contain one, just return since we do not want to
874          * allocate any memory yet. So check cookie length...
875          */
876         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
877                 {
878                 unsigned int session_length, cookie_length;
879                 
880                 session_length = *(p + SSL3_RANDOM_SIZE);
881                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
882
883                 if (cookie_length == 0)
884                         return 1;
885                 }
886
887         /* load the client random */
888         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
889         p+=SSL3_RANDOM_SIZE;
890
891         /* get the session-id */
892         j= *(p++);
893
894         s->hit=0;
895         /* Versions before 0.9.7 always allow session reuse during renegotiation
896          * (i.e. when s->new_session is true), option
897          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
898          * Maybe this optional behaviour should always have been the default,
899          * but we cannot safely change the default behaviour (or new applications
900          * might be written that become totally unsecure when compiled with
901          * an earlier library version)
902          */
903         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
904                 {
905                 if (!ssl_get_new_session(s,1))
906                         goto err;
907                 }
908         else
909                 {
910                 i=ssl_get_prev_session(s, p, j, d + n);
911                 if (i == 1)
912                         { /* previous session */
913                         s->hit=1;
914                         }
915                 else if (i == -1)
916                         goto err;
917                 else /* i == 0 */
918                         {
919                         if (!ssl_get_new_session(s,1))
920                                 goto err;
921                         }
922                 }
923
924         p+=j;
925
926         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
927                 {
928                 /* cookie stuff */
929                 cookie_len = *(p++);
930
931                 /* 
932                  * The ClientHello may contain a cookie even if the
933                  * HelloVerify message has not been sent--make sure that it
934                  * does not cause an overflow.
935                  */
936                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
937                         {
938                         /* too much data */
939                         al = SSL_AD_DECODE_ERROR;
940                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
941                         goto f_err;
942                         }
943
944                 /* verify the cookie if appropriate option is set. */
945                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
946                         cookie_len > 0)
947                         {
948                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
949
950                         if ( s->ctx->app_verify_cookie_cb != NULL)
951                                 {
952                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
953                                         cookie_len) == 0)
954                                         {
955                                         al=SSL_AD_HANDSHAKE_FAILURE;
956                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
957                                                 SSL_R_COOKIE_MISMATCH);
958                                         goto f_err;
959                                         }
960                                 /* else cookie verification succeeded */
961                                 }
962                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
963                                                   s->d1->cookie_len) != 0) /* default verification */
964                                 {
965                                         al=SSL_AD_HANDSHAKE_FAILURE;
966                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
967                                                 SSL_R_COOKIE_MISMATCH);
968                                         goto f_err;
969                                 }
970
971                         ret = 2;
972                         }
973
974                 p += cookie_len;
975                 }
976
977         n2s(p,i);
978         if ((i == 0) && (j != 0))
979                 {
980                 /* we need a cipher if we are not resuming a session */
981                 al=SSL_AD_ILLEGAL_PARAMETER;
982                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
983                 goto f_err;
984                 }
985         if ((p+i) >= (d+n))
986                 {
987                 /* not enough data */
988                 al=SSL_AD_DECODE_ERROR;
989                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
990                 goto f_err;
991                 }
992         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
993                 == NULL))
994                 {
995                 goto err;
996                 }
997         p+=i;
998
999         /* If it is a hit, check that the cipher is in the list */
1000         if ((s->hit) && (i > 0))
1001                 {
1002                 j=0;
1003                 id=s->session->cipher->id;
1004
1005 #ifdef CIPHER_DEBUG
1006                 printf("client sent %d ciphers\n",sk_num(ciphers));
1007 #endif
1008                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1009                         {
1010                         c=sk_SSL_CIPHER_value(ciphers,i);
1011 #ifdef CIPHER_DEBUG
1012                         printf("client [%2d of %2d]:%s\n",
1013                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1014 #endif
1015                         if (c->id == id)
1016                                 {
1017                                 j=1;
1018                                 break;
1019                                 }
1020                         }
1021                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1022                         {
1023                         /* Special case as client bug workaround: the previously used cipher may
1024                          * not be in the current list, the client instead might be trying to
1025                          * continue using a cipher that before wasn't chosen due to server
1026                          * preferences.  We'll have to reject the connection if the cipher is not
1027                          * enabled, though. */
1028                         c = sk_SSL_CIPHER_value(ciphers, 0);
1029                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1030                                 {
1031                                 s->session->cipher = c;
1032                                 j = 1;
1033                                 }
1034                         }
1035                 if (j == 0)
1036                         {
1037                         /* we need to have the cipher in the cipher
1038                          * list if we are asked to reuse it */
1039                         al=SSL_AD_ILLEGAL_PARAMETER;
1040                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1041                         goto f_err;
1042                         }
1043                 }
1044
1045         /* compression */
1046         i= *(p++);
1047         if ((p+i) > (d+n))
1048                 {
1049                 /* not enough data */
1050                 al=SSL_AD_DECODE_ERROR;
1051                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1052                 goto f_err;
1053                 }
1054         q=p;
1055         for (j=0; j<i; j++)
1056                 {
1057                 if (p[j] == 0) break;
1058                 }
1059
1060         p+=i;
1061         if (j >= i)
1062                 {
1063                 /* no compress */
1064                 al=SSL_AD_DECODE_ERROR;
1065                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1066                 goto f_err;
1067                 }
1068
1069 #ifndef OPENSSL_NO_TLSEXT
1070         /* TLS extensions*/
1071         if (s->version >= SSL3_VERSION)
1072                 {
1073                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1074                         {
1075                         /* 'al' set by ssl_parse_clienthello_tlsext */
1076                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1077                         goto f_err;
1078                         }
1079                 }
1080                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1081                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1082                         goto err;
1083                 }
1084
1085         /* Check if we want to use external pre-shared secret for this
1086          * handshake for not reused session only. We need to generate
1087          * server_random before calling tls_session_secret_cb in order to allow
1088          * SessionTicket processing to use it in key derivation. */
1089         {
1090                 unsigned long Time;
1091                 unsigned char *pos;
1092                 Time=(unsigned long)time(NULL);                 /* Time */
1093                 pos=s->s3->server_random;
1094                 l2n(Time,pos);
1095                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1096                         {
1097                         al=SSL_AD_INTERNAL_ERROR;
1098                         goto f_err;
1099                         }
1100         }
1101
1102         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1103                 {
1104                 SSL_CIPHER *pref_cipher=NULL;
1105
1106                 s->session->master_key_length=sizeof(s->session->master_key);
1107                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1108                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1109                         {
1110                         s->hit=1;
1111                         s->session->ciphers=ciphers;
1112                         s->session->verify_result=X509_V_OK;
1113
1114                         ciphers=NULL;
1115
1116                         /* check if some cipher was preferred by call back */
1117                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1118                         if (pref_cipher == NULL)
1119                                 {
1120                                 al=SSL_AD_HANDSHAKE_FAILURE;
1121                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1122                                 goto f_err;
1123                                 }
1124
1125                         s->session->cipher=pref_cipher;
1126
1127                         if (s->cipher_list)
1128                                 sk_SSL_CIPHER_free(s->cipher_list);
1129
1130                         if (s->cipher_list_by_id)
1131                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1132
1133                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1134                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1135                         }
1136                 }
1137 #endif
1138
1139         /* Worst case, we will use the NULL compression, but if we have other
1140          * options, we will now look for them.  We have i-1 compression
1141          * algorithms from the client, starting at q. */
1142         s->s3->tmp.new_compression=NULL;
1143 #ifndef OPENSSL_NO_COMP
1144         /* This only happens if we have a cache hit */
1145         if (s->session->compress_meth != 0)
1146                 {
1147                 int m, comp_id = s->session->compress_meth;
1148                 /* Perform sanity checks on resumed compression algorithm */
1149                 /* Can't disable compression */
1150                 if (s->options & SSL_OP_NO_COMPRESSION)
1151                         {
1152                         al=SSL_AD_INTERNAL_ERROR;
1153                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1154                         goto f_err;
1155                         }
1156                 /* Look for resumed compression method */
1157                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1158                         {
1159                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1160                         if (comp_id == comp->id)
1161                                 {
1162                                 s->s3->tmp.new_compression=comp;
1163                                 break;
1164                                 }
1165                         }
1166                 if (s->s3->tmp.new_compression == NULL)
1167                         {
1168                         al=SSL_AD_INTERNAL_ERROR;
1169                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1170                         goto f_err;
1171                         }
1172                 /* Look for resumed method in compression list */
1173                 for (m = 0; m < i; m++)
1174                         {
1175                         if (q[m] == comp_id)
1176                                 break;
1177                         }
1178                 if (m >= i)
1179                         {
1180                         al=SSL_AD_ILLEGAL_PARAMETER;
1181                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1182                         goto f_err;
1183                         }
1184                 }
1185         else if (s->hit)
1186                 comp = NULL;
1187         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1188                 { /* See if we have a match */
1189                 int m,nn,o,v,done=0;
1190
1191                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1192                 for (m=0; m<nn; m++)
1193                         {
1194                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1195                         v=comp->id;
1196                         for (o=0; o<i; o++)
1197                                 {
1198                                 if (v == q[o])
1199                                         {
1200                                         done=1;
1201                                         break;
1202                                         }
1203                                 }
1204                         if (done) break;
1205                         }
1206                 if (done)
1207                         s->s3->tmp.new_compression=comp;
1208                 else
1209                         comp=NULL;
1210                 }
1211 #else
1212         /* If compression is disabled we'd better not try to resume a session
1213          * using compression.
1214          */
1215         if (s->session->compress_meth != 0)
1216                 {
1217                 al=SSL_AD_INTERNAL_ERROR;
1218                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1219                 goto f_err;
1220                 }
1221 #endif
1222
1223         /* Given s->session->ciphers and SSL_get_ciphers, we must
1224          * pick a cipher */
1225
1226         if (!s->hit)
1227                 {
1228 #ifdef OPENSSL_NO_COMP
1229                 s->session->compress_meth=0;
1230 #else
1231                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1232 #endif
1233                 if (s->session->ciphers != NULL)
1234                         sk_SSL_CIPHER_free(s->session->ciphers);
1235                 s->session->ciphers=ciphers;
1236                 if (ciphers == NULL)
1237                         {
1238                         al=SSL_AD_ILLEGAL_PARAMETER;
1239                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1240                         goto f_err;
1241                         }
1242                 ciphers=NULL;
1243                 c=ssl3_choose_cipher(s,s->session->ciphers,
1244                                      SSL_get_ciphers(s));
1245
1246                 if (c == NULL)
1247                         {
1248                         al=SSL_AD_HANDSHAKE_FAILURE;
1249                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1250                         goto f_err;
1251                         }
1252                 s->s3->tmp.new_cipher=c;
1253                 }
1254         else
1255                 {
1256                 /* Session-id reuse */
1257 #ifdef REUSE_CIPHER_BUG
1258                 STACK_OF(SSL_CIPHER) *sk;
1259                 SSL_CIPHER *nc=NULL;
1260                 SSL_CIPHER *ec=NULL;
1261
1262                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1263                         {
1264                         sk=s->session->ciphers;
1265                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1266                                 {
1267                                 c=sk_SSL_CIPHER_value(sk,i);
1268                                 if (c->algorithm_enc & SSL_eNULL)
1269                                         nc=c;
1270                                 if (SSL_C_IS_EXPORT(c))
1271                                         ec=c;
1272                                 }
1273                         if (nc != NULL)
1274                                 s->s3->tmp.new_cipher=nc;
1275                         else if (ec != NULL)
1276                                 s->s3->tmp.new_cipher=ec;
1277                         else
1278                                 s->s3->tmp.new_cipher=s->session->cipher;
1279                         }
1280                 else
1281 #endif
1282                 s->s3->tmp.new_cipher=s->session->cipher;
1283                 }
1284
1285         if (!ssl3_digest_cached_records(s))
1286                 goto f_err;
1287         
1288         /* we now have the following setup. 
1289          * client_random
1290          * cipher_list          - our prefered list of ciphers
1291          * ciphers              - the clients prefered list of ciphers
1292          * compression          - basically ignored right now
1293          * ssl version is set   - sslv3
1294          * s->session           - The ssl session has been setup.
1295          * s->hit               - session reuse flag
1296          * s->tmp.new_cipher    - the new cipher to use.
1297          */
1298
1299         if (ret < 0) ret=1;
1300         if (0)
1301                 {
1302 f_err:
1303                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1304                 }
1305 err:
1306         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1307         return(ret);
1308         }
1309
1310 int ssl3_send_server_hello(SSL *s)
1311         {
1312         unsigned char *buf;
1313         unsigned char *p,*d;
1314         int i,sl;
1315         unsigned long l;
1316 #ifdef OPENSSL_NO_TLSEXT
1317         unsigned long Time;
1318 #endif
1319
1320         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1321                 {
1322                 buf=(unsigned char *)s->init_buf->data;
1323 #ifdef OPENSSL_NO_TLSEXT
1324                 p=s->s3->server_random;
1325                 /* Generate server_random if it was not needed previously */
1326                 Time=(unsigned long)time(NULL);                 /* Time */
1327                 l2n(Time,p);
1328                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1329                         return -1;
1330 #endif
1331                 /* Do the message type and length last */
1332                 d=p= &(buf[4]);
1333
1334                 *(p++)=s->version>>8;
1335                 *(p++)=s->version&0xff;
1336
1337                 /* Random stuff */
1338                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1339                 p+=SSL3_RANDOM_SIZE;
1340
1341                 /* now in theory we have 3 options to sending back the
1342                  * session id.  If it is a re-use, we send back the
1343                  * old session-id, if it is a new session, we send
1344                  * back the new session-id or we send back a 0 length
1345                  * session-id if we want it to be single use.
1346                  * Currently I will not implement the '0' length session-id
1347                  * 12-Jan-98 - I'll now support the '0' length stuff.
1348                  *
1349                  * We also have an additional case where stateless session
1350                  * resumption is successful: we always send back the old
1351                  * session id. In this case s->hit is non zero: this can
1352                  * only happen if stateless session resumption is succesful
1353                  * if session caching is disabled so existing functionality
1354                  * is unaffected.
1355                  */
1356                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1357                         && !s->hit)
1358                         s->session->session_id_length=0;
1359
1360                 sl=s->session->session_id_length;
1361                 if (sl > (int)sizeof(s->session->session_id))
1362                         {
1363                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1364                         return -1;
1365                         }
1366                 *(p++)=sl;
1367                 memcpy(p,s->session->session_id,sl);
1368                 p+=sl;
1369
1370                 /* put the cipher */
1371                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1372                 p+=i;
1373
1374                 /* put the compression method */
1375 #ifdef OPENSSL_NO_COMP
1376                         *(p++)=0;
1377 #else
1378                 if (s->s3->tmp.new_compression == NULL)
1379                         *(p++)=0;
1380                 else
1381                         *(p++)=s->s3->tmp.new_compression->id;
1382 #endif
1383 #ifndef OPENSSL_NO_TLSEXT
1384                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1385                         {
1386                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1387                         return -1;
1388                         }
1389                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1390                         {
1391                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1392                         return -1;
1393                         }
1394 #endif
1395                 /* do the header */
1396                 l=(p-d);
1397                 d=buf;
1398                 *(d++)=SSL3_MT_SERVER_HELLO;
1399                 l2n3(l,d);
1400
1401                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1402                 /* number of bytes to write */
1403                 s->init_num=p-buf;
1404                 s->init_off=0;
1405                 }
1406
1407         /* SSL3_ST_SW_SRVR_HELLO_B */
1408         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1409         }
1410
1411 int ssl3_send_server_done(SSL *s)
1412         {
1413         unsigned char *p;
1414
1415         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1416                 {
1417                 p=(unsigned char *)s->init_buf->data;
1418
1419                 /* do the header */
1420                 *(p++)=SSL3_MT_SERVER_DONE;
1421                 *(p++)=0;
1422                 *(p++)=0;
1423                 *(p++)=0;
1424
1425                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1426                 /* number of bytes to write */
1427                 s->init_num=4;
1428                 s->init_off=0;
1429                 }
1430
1431         /* SSL3_ST_SW_SRVR_DONE_B */
1432         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1433         }
1434
1435 int ssl3_send_server_key_exchange(SSL *s)
1436         {
1437 #ifndef OPENSSL_NO_RSA
1438         unsigned char *q;
1439         int j,num;
1440         RSA *rsa;
1441         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1442         unsigned int u;
1443 #endif
1444 #ifndef OPENSSL_NO_DH
1445         DH *dh=NULL,*dhp;
1446 #endif
1447 #ifndef OPENSSL_NO_ECDH
1448         EC_KEY *ecdh=NULL, *ecdhp;
1449         unsigned char *encodedPoint = NULL;
1450         int encodedlen = 0;
1451         int curve_id = 0;
1452         BN_CTX *bn_ctx = NULL; 
1453 #endif
1454         EVP_PKEY *pkey;
1455         unsigned char *p,*d;
1456         int al,i;
1457         unsigned long type;
1458         int n;
1459         CERT *cert;
1460         BIGNUM *r[4];
1461         int nr[4],kn;
1462         BUF_MEM *buf;
1463         EVP_MD_CTX md_ctx;
1464
1465         EVP_MD_CTX_init(&md_ctx);
1466         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1467                 {
1468                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1469                 cert=s->cert;
1470
1471                 buf=s->init_buf;
1472
1473                 r[0]=r[1]=r[2]=r[3]=NULL;
1474                 n=0;
1475 #ifndef OPENSSL_NO_RSA
1476                 if (type & SSL_kRSA)
1477                         {
1478                         rsa=cert->rsa_tmp;
1479                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1480                                 {
1481                                 rsa=s->cert->rsa_tmp_cb(s,
1482                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1483                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1484                                 if(rsa == NULL)
1485                                 {
1486                                         al=SSL_AD_HANDSHAKE_FAILURE;
1487                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1488                                         goto f_err;
1489                                 }
1490                                 RSA_up_ref(rsa);
1491                                 cert->rsa_tmp=rsa;
1492                                 }
1493                         if (rsa == NULL)
1494                                 {
1495                                 al=SSL_AD_HANDSHAKE_FAILURE;
1496                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1497                                 goto f_err;
1498                                 }
1499                         r[0]=rsa->n;
1500                         r[1]=rsa->e;
1501                         s->s3->tmp.use_rsa_tmp=1;
1502                         }
1503                 else
1504 #endif
1505 #ifndef OPENSSL_NO_DH
1506                         if (type & SSL_kEDH)
1507                         {
1508                         dhp=cert->dh_tmp;
1509                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1510                                 dhp=s->cert->dh_tmp_cb(s,
1511                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1512                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1513                         if (dhp == NULL)
1514                                 {
1515                                 al=SSL_AD_HANDSHAKE_FAILURE;
1516                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1517                                 goto f_err;
1518                                 }
1519
1520                         if (s->s3->tmp.dh != NULL)
1521                                 {
1522                                 DH_free(dh);
1523                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1524                                 goto err;
1525                                 }
1526
1527                         if ((dh=DHparams_dup(dhp)) == NULL)
1528                                 {
1529                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1530                                 goto err;
1531                                 }
1532
1533                         s->s3->tmp.dh=dh;
1534                         if ((dhp->pub_key == NULL ||
1535                              dhp->priv_key == NULL ||
1536                              (s->options & SSL_OP_SINGLE_DH_USE)))
1537                                 {
1538                                 if(!DH_generate_key(dh))
1539                                     {
1540                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1541                                            ERR_R_DH_LIB);
1542                                     goto err;
1543                                     }
1544                                 }
1545                         else
1546                                 {
1547                                 dh->pub_key=BN_dup(dhp->pub_key);
1548                                 dh->priv_key=BN_dup(dhp->priv_key);
1549                                 if ((dh->pub_key == NULL) ||
1550                                         (dh->priv_key == NULL))
1551                                         {
1552                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1553                                         goto err;
1554                                         }
1555                                 }
1556                         r[0]=dh->p;
1557                         r[1]=dh->g;
1558                         r[2]=dh->pub_key;
1559                         }
1560                 else 
1561 #endif
1562 #ifndef OPENSSL_NO_ECDH
1563                         if (type & SSL_kEECDH)
1564                         {
1565                         const EC_GROUP *group;
1566
1567                         ecdhp=cert->ecdh_tmp;
1568                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1569                                 {
1570                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1571                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1572                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1573                                 }
1574                         if (ecdhp == NULL)
1575                                 {
1576                                 al=SSL_AD_HANDSHAKE_FAILURE;
1577                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1578                                 goto f_err;
1579                                 }
1580
1581                         if (s->s3->tmp.ecdh != NULL)
1582                                 {
1583                                 EC_KEY_free(s->s3->tmp.ecdh); 
1584                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1585                                 goto err;
1586                                 }
1587
1588                         /* Duplicate the ECDH structure. */
1589                         if (ecdhp == NULL)
1590                                 {
1591                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1592                                 goto err;
1593                                 }
1594                         if (!EC_KEY_up_ref(ecdhp))
1595                                 {
1596                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1597                                 goto err;
1598                                 }
1599                         ecdh = ecdhp;
1600
1601                         s->s3->tmp.ecdh=ecdh;
1602                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1603                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1604                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1605                                 {
1606                                 if(!EC_KEY_generate_key(ecdh))
1607                                     {
1608                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1609                                     goto err;
1610                                     }
1611                                 }
1612
1613                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1614                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1615                             (EC_KEY_get0_private_key(ecdh) == NULL))
1616                                 {
1617                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1618                                 goto err;
1619                                 }
1620
1621                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1622                             (EC_GROUP_get_degree(group) > 163)) 
1623                                 {
1624                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1625                                 goto err;
1626                                 }
1627
1628                         /* XXX: For now, we only support ephemeral ECDH
1629                          * keys over named (not generic) curves. For 
1630                          * supported named curves, curve_id is non-zero.
1631                          */
1632                         if ((curve_id = 
1633                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1634                             == 0)
1635                                 {
1636                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1637                                 goto err;
1638                                 }
1639
1640                         /* Encode the public key.
1641                          * First check the size of encoding and
1642                          * allocate memory accordingly.
1643                          */
1644                         encodedlen = EC_POINT_point2oct(group, 
1645                             EC_KEY_get0_public_key(ecdh),
1646                             POINT_CONVERSION_UNCOMPRESSED, 
1647                             NULL, 0, NULL);
1648
1649                         encodedPoint = (unsigned char *) 
1650                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1651                         bn_ctx = BN_CTX_new();
1652                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1653                                 {
1654                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1655                                 goto err;
1656                                 }
1657
1658
1659                         encodedlen = EC_POINT_point2oct(group, 
1660                             EC_KEY_get0_public_key(ecdh), 
1661                             POINT_CONVERSION_UNCOMPRESSED, 
1662                             encodedPoint, encodedlen, bn_ctx);
1663
1664                         if (encodedlen == 0) 
1665                                 {
1666                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1667                                 goto err;
1668                                 }
1669
1670                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1671
1672                         /* XXX: For now, we only support named (not 
1673                          * generic) curves in ECDH ephemeral key exchanges.
1674                          * In this situation, we need four additional bytes
1675                          * to encode the entire ServerECDHParams
1676                          * structure. 
1677                          */
1678                         n = 4 + encodedlen;
1679
1680                         /* We'll generate the serverKeyExchange message
1681                          * explicitly so we can set these to NULLs
1682                          */
1683                         r[0]=NULL;
1684                         r[1]=NULL;
1685                         r[2]=NULL;
1686                         r[3]=NULL;
1687                         }
1688                 else 
1689 #endif /* !OPENSSL_NO_ECDH */
1690 #ifndef OPENSSL_NO_PSK
1691                         if (type & SSL_kPSK)
1692                                 {
1693                                 /* reserve size for record length and PSK identity hint*/
1694                                 n+=2+strlen(s->ctx->psk_identity_hint);
1695                                 }
1696                         else
1697 #endif /* !OPENSSL_NO_PSK */
1698                         {
1699                         al=SSL_AD_HANDSHAKE_FAILURE;
1700                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1701                         goto f_err;
1702                         }
1703                 for (i=0; r[i] != NULL; i++)
1704                         {
1705                         nr[i]=BN_num_bytes(r[i]);
1706                         n+=2+nr[i];
1707                         }
1708
1709                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1710                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1711                         {
1712                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1713                                 == NULL)
1714                                 {
1715                                 al=SSL_AD_DECODE_ERROR;
1716                                 goto f_err;
1717                                 }
1718                         kn=EVP_PKEY_size(pkey);
1719                         }
1720                 else
1721                         {
1722                         pkey=NULL;
1723                         kn=0;
1724                         }
1725
1726                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1727                         {
1728                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1729                         goto err;
1730                         }
1731                 d=(unsigned char *)s->init_buf->data;
1732                 p= &(d[4]);
1733
1734                 for (i=0; r[i] != NULL; i++)
1735                         {
1736                         s2n(nr[i],p);
1737                         BN_bn2bin(r[i],p);
1738                         p+=nr[i];
1739                         }
1740
1741 #ifndef OPENSSL_NO_ECDH
1742                 if (type & SSL_kEECDH) 
1743                         {
1744                         /* XXX: For now, we only support named (not generic) curves.
1745                          * In this situation, the serverKeyExchange message has:
1746                          * [1 byte CurveType], [2 byte CurveName]
1747                          * [1 byte length of encoded point], followed by
1748                          * the actual encoded point itself
1749                          */
1750                         *p = NAMED_CURVE_TYPE;
1751                         p += 1;
1752                         *p = 0;
1753                         p += 1;
1754                         *p = curve_id;
1755                         p += 1;
1756                         *p = encodedlen;
1757                         p += 1;
1758                         memcpy((unsigned char*)p, 
1759                             (unsigned char *)encodedPoint, 
1760                             encodedlen);
1761                         OPENSSL_free(encodedPoint);
1762                         p += encodedlen;
1763                         }
1764 #endif
1765
1766 #ifndef OPENSSL_NO_PSK
1767                 if (type & SSL_kPSK)
1768                         {
1769                         /* copy PSK identity hint */
1770                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1771                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1772                         p+=strlen(s->ctx->psk_identity_hint);
1773                         }
1774 #endif
1775
1776                 /* not anonymous */
1777                 if (pkey != NULL)
1778                         {
1779                         /* n is the length of the params, they start at &(d[4])
1780                          * and p points to the space at the end. */
1781 #ifndef OPENSSL_NO_RSA
1782                         if (pkey->type == EVP_PKEY_RSA)
1783                                 {
1784                                 q=md_buf;
1785                                 j=0;
1786                                 for (num=2; num > 0; num--)
1787                                         {
1788                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1789                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1790                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1791                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1792                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1793                                         EVP_DigestFinal_ex(&md_ctx,q,
1794                                                 (unsigned int *)&i);
1795                                         q+=i;
1796                                         j+=i;
1797                                         }
1798                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1799                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1800                                         {
1801                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1802                                         goto err;
1803                                         }
1804                                 s2n(u,p);
1805                                 n+=u+2;
1806                                 }
1807                         else
1808 #endif
1809 #if !defined(OPENSSL_NO_DSA)
1810                                 if (pkey->type == EVP_PKEY_DSA)
1811                                 {
1812                                 /* lets do DSS */
1813                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1814                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1815                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1816                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1817                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1818                                         (unsigned int *)&i,pkey))
1819                                         {
1820                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1821                                         goto err;
1822                                         }
1823                                 s2n(i,p);
1824                                 n+=i+2;
1825                                 }
1826                         else
1827 #endif
1828 #if !defined(OPENSSL_NO_ECDSA)
1829                                 if (pkey->type == EVP_PKEY_EC)
1830                                 {
1831                                 /* let's do ECDSA */
1832                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1833                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1834                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1835                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1836                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1837                                         (unsigned int *)&i,pkey))
1838                                         {
1839                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1840                                         goto err;
1841                                         }
1842                                 s2n(i,p);
1843                                 n+=i+2;
1844                                 }
1845                         else
1846 #endif
1847                                 {
1848                                 /* Is this error check actually needed? */
1849                                 al=SSL_AD_HANDSHAKE_FAILURE;
1850                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1851                                 goto f_err;
1852                                 }
1853                         }
1854
1855                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1856                 l2n3(n,d);
1857
1858                 /* we should now have things packed up, so lets send
1859                  * it off */
1860                 s->init_num=n+4;
1861                 s->init_off=0;
1862                 }
1863
1864         s->state = SSL3_ST_SW_KEY_EXCH_B;
1865         EVP_MD_CTX_cleanup(&md_ctx);
1866         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1867 f_err:
1868         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1869 err:
1870 #ifndef OPENSSL_NO_ECDH
1871         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1872         BN_CTX_free(bn_ctx);
1873 #endif
1874         EVP_MD_CTX_cleanup(&md_ctx);
1875         return(-1);
1876         }
1877
1878 int ssl3_send_certificate_request(SSL *s)
1879         {
1880         unsigned char *p,*d;
1881         int i,j,nl,off,n;
1882         STACK_OF(X509_NAME) *sk=NULL;
1883         X509_NAME *name;
1884         BUF_MEM *buf;
1885
1886         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1887                 {
1888                 buf=s->init_buf;
1889
1890                 d=p=(unsigned char *)&(buf->data[4]);
1891
1892                 /* get the list of acceptable cert types */
1893                 p++;
1894                 n=ssl3_get_req_cert_type(s,p);
1895                 d[0]=n;
1896                 p+=n;
1897                 n++;
1898
1899                 off=n;
1900                 p+=2;
1901                 n+=2;
1902
1903                 sk=SSL_get_client_CA_list(s);
1904                 nl=0;
1905                 if (sk != NULL)
1906                         {
1907                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1908                                 {
1909                                 name=sk_X509_NAME_value(sk,i);
1910                                 j=i2d_X509_NAME(name,NULL);
1911                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1912                                         {
1913                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1914                                         goto err;
1915                                         }
1916                                 p=(unsigned char *)&(buf->data[4+n]);
1917                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1918                                         {
1919                                         s2n(j,p);
1920                                         i2d_X509_NAME(name,&p);
1921                                         n+=2+j;
1922                                         nl+=2+j;
1923                                         }
1924                                 else
1925                                         {
1926                                         d=p;
1927                                         i2d_X509_NAME(name,&p);
1928                                         j-=2; s2n(j,d); j+=2;
1929                                         n+=j;
1930                                         nl+=j;
1931                                         }
1932                                 }
1933                         }
1934                 /* else no CA names */
1935                 p=(unsigned char *)&(buf->data[4+off]);
1936                 s2n(nl,p);
1937
1938                 d=(unsigned char *)buf->data;
1939                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1940                 l2n3(n,d);
1941
1942                 /* we should now have things packed up, so lets send
1943                  * it off */
1944
1945                 s->init_num=n+4;
1946                 s->init_off=0;
1947 #ifdef NETSCAPE_HANG_BUG
1948                 p=(unsigned char *)s->init_buf->data + s->init_num;
1949
1950                 /* do the header */
1951                 *(p++)=SSL3_MT_SERVER_DONE;
1952                 *(p++)=0;
1953                 *(p++)=0;
1954                 *(p++)=0;
1955                 s->init_num += 4;
1956 #endif
1957
1958                 s->state = SSL3_ST_SW_CERT_REQ_B;
1959                 }
1960
1961         /* SSL3_ST_SW_CERT_REQ_B */
1962         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1963 err:
1964         return(-1);
1965         }
1966
1967 int ssl3_get_client_key_exchange(SSL *s)
1968         {
1969         int i,al,ok;
1970         long n;
1971         unsigned long alg_k;
1972         unsigned char *p;
1973 #ifndef OPENSSL_NO_RSA
1974         RSA *rsa=NULL;
1975         EVP_PKEY *pkey=NULL;
1976 #endif
1977 #ifndef OPENSSL_NO_DH
1978         BIGNUM *pub=NULL;
1979         DH *dh_srvr;
1980 #endif
1981 #ifndef OPENSSL_NO_KRB5
1982         KSSL_ERR kssl_err;
1983 #endif /* OPENSSL_NO_KRB5 */
1984
1985 #ifndef OPENSSL_NO_ECDH
1986         EC_KEY *srvr_ecdh = NULL;
1987         EVP_PKEY *clnt_pub_pkey = NULL;
1988         EC_POINT *clnt_ecpoint = NULL;
1989         BN_CTX *bn_ctx = NULL; 
1990 #endif
1991
1992         n=s->method->ssl_get_message(s,
1993                 SSL3_ST_SR_KEY_EXCH_A,
1994                 SSL3_ST_SR_KEY_EXCH_B,
1995                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1996                 2048, /* ??? */
1997                 &ok);
1998
1999         if (!ok) return((int)n);
2000         p=(unsigned char *)s->init_msg;
2001
2002         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2003
2004 #ifndef OPENSSL_NO_RSA
2005         if (alg_k & SSL_kRSA)
2006                 {
2007                 /* FIX THIS UP EAY EAY EAY EAY */
2008                 if (s->s3->tmp.use_rsa_tmp)
2009                         {
2010                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2011                                 rsa=s->cert->rsa_tmp;
2012                         /* Don't do a callback because rsa_tmp should
2013                          * be sent already */
2014                         if (rsa == NULL)
2015                                 {
2016                                 al=SSL_AD_HANDSHAKE_FAILURE;
2017                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2018                                 goto f_err;
2019
2020                                 }
2021                         }
2022                 else
2023                         {
2024                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2025                         if (    (pkey == NULL) ||
2026                                 (pkey->type != EVP_PKEY_RSA) ||
2027                                 (pkey->pkey.rsa == NULL))
2028                                 {
2029                                 al=SSL_AD_HANDSHAKE_FAILURE;
2030                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2031                                 goto f_err;
2032                                 }
2033                         rsa=pkey->pkey.rsa;
2034                         }
2035
2036                 /* TLS and [incidentally] DTLS{0xFEFF} */
2037                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2038                         {
2039                         n2s(p,i);
2040                         if (n != i+2)
2041                                 {
2042                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2043                                         {
2044                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2045                                         goto err;
2046                                         }
2047                                 else
2048                                         p-=2;
2049                                 }
2050                         else
2051                                 n=i;
2052                         }
2053
2054                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2055
2056                 al = -1;
2057                 
2058                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2059                         {
2060                         al=SSL_AD_DECODE_ERROR;
2061                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2062                         }
2063
2064                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2065                         {
2066                         /* The premaster secret must contain the same version number as the
2067                          * ClientHello to detect version rollback attacks (strangely, the
2068                          * protocol does not offer such protection for DH ciphersuites).
2069                          * However, buggy clients exist that send the negotiated protocol
2070                          * version instead if the server does not support the requested
2071                          * protocol version.
2072                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2073                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2074                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2075                                 {
2076                                 al=SSL_AD_DECODE_ERROR;
2077                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2078
2079                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2080                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2081                                  * number check as a "bad version oracle" -- an alert would
2082                                  * reveal that the plaintext corresponding to some ciphertext
2083                                  * made up by the adversary is properly formatted except
2084                                  * that the version number is wrong.  To avoid such attacks,
2085                                  * we should treat this just like any other decryption error. */
2086                                 }
2087                         }
2088
2089                 if (al != -1)
2090                         {
2091                         /* Some decryption failure -- use random value instead as countermeasure
2092                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2093                          * (see RFC 2246, section 7.4.7.1). */
2094                         ERR_clear_error();
2095                         i = SSL_MAX_MASTER_KEY_LENGTH;
2096                         p[0] = s->client_version >> 8;
2097                         p[1] = s->client_version & 0xff;
2098                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2099                                 goto err;
2100                         }
2101         
2102                 s->session->master_key_length=
2103                         s->method->ssl3_enc->generate_master_secret(s,
2104                                 s->session->master_key,
2105                                 p,i);
2106                 OPENSSL_cleanse(p,i);
2107                 }
2108         else
2109 #endif
2110 #ifndef OPENSSL_NO_DH
2111                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2112                 {
2113                 n2s(p,i);
2114                 if (n != i+2)
2115                         {
2116                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2117                                 {
2118                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2119                                 goto err;
2120                                 }
2121                         else
2122                                 {
2123                                 p-=2;
2124                                 i=(int)n;
2125                                 }
2126                         }
2127
2128                 if (n == 0L) /* the parameters are in the cert */
2129                         {
2130                         al=SSL_AD_HANDSHAKE_FAILURE;
2131                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2132                         goto f_err;
2133                         }
2134                 else
2135                         {
2136                         if (s->s3->tmp.dh == NULL)
2137                                 {
2138                                 al=SSL_AD_HANDSHAKE_FAILURE;
2139                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2140                                 goto f_err;
2141                                 }
2142                         else
2143                                 dh_srvr=s->s3->tmp.dh;
2144                         }
2145
2146                 pub=BN_bin2bn(p,i,NULL);
2147                 if (pub == NULL)
2148                         {
2149                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2150                         goto err;
2151                         }
2152
2153                 i=DH_compute_key(p,pub,dh_srvr);
2154
2155                 if (i <= 0)
2156                         {
2157                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2158                         goto err;
2159                         }
2160
2161                 DH_free(s->s3->tmp.dh);
2162                 s->s3->tmp.dh=NULL;
2163
2164                 BN_clear_free(pub);
2165                 pub=NULL;
2166                 s->session->master_key_length=
2167                         s->method->ssl3_enc->generate_master_secret(s,
2168                                 s->session->master_key,p,i);
2169                 OPENSSL_cleanse(p,i);
2170                 }
2171         else
2172 #endif
2173 #ifndef OPENSSL_NO_KRB5
2174         if (alg_k & SSL_kKRB5)
2175                 {
2176                 krb5_error_code         krb5rc;
2177                 krb5_data               enc_ticket;
2178                 krb5_data               authenticator;
2179                 krb5_data               enc_pms;
2180                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2181                 EVP_CIPHER_CTX          ciph_ctx;
2182                 const EVP_CIPHER        *enc = NULL;
2183                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2184                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2185                                                + EVP_MAX_BLOCK_LENGTH];
2186                 int                  padl, outl;
2187                 krb5_timestamp          authtime = 0;
2188                 krb5_ticket_times       ttimes;
2189
2190                 EVP_CIPHER_CTX_init(&ciph_ctx);
2191
2192                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2193
2194                 n2s(p,i);
2195                 enc_ticket.length = i;
2196
2197                 if (n < (long)(enc_ticket.length + 6))
2198                         {
2199                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2200                                 SSL_R_DATA_LENGTH_TOO_LONG);
2201                         goto err;
2202                         }
2203
2204                 enc_ticket.data = (char *)p;
2205                 p+=enc_ticket.length;
2206
2207                 n2s(p,i);
2208                 authenticator.length = i;
2209
2210                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2211                         {
2212                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2213                                 SSL_R_DATA_LENGTH_TOO_LONG);
2214                         goto err;
2215                         }
2216
2217                 authenticator.data = (char *)p;
2218                 p+=authenticator.length;
2219
2220                 n2s(p,i);
2221                 enc_pms.length = i;
2222                 enc_pms.data = (char *)p;
2223                 p+=enc_pms.length;
2224
2225                 /* Note that the length is checked again below,
2226                 ** after decryption
2227                 */
2228                 if(enc_pms.length > sizeof pms)
2229                         {
2230                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2231                                SSL_R_DATA_LENGTH_TOO_LONG);
2232                         goto err;
2233                         }
2234
2235                 if (n != (long)(enc_ticket.length + authenticator.length +
2236                                                 enc_pms.length + 6))
2237                         {
2238                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2239                                 SSL_R_DATA_LENGTH_TOO_LONG);
2240                         goto err;
2241                         }
2242
2243                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2244                                         &kssl_err)) != 0)
2245                         {
2246 #ifdef KSSL_DEBUG
2247                         printf("kssl_sget_tkt rtn %d [%d]\n",
2248                                 krb5rc, kssl_err.reason);
2249                         if (kssl_err.text)
2250                                 printf("kssl_err text= %s\n", kssl_err.text);
2251 #endif  /* KSSL_DEBUG */
2252                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2253                                 kssl_err.reason);
2254                         goto err;
2255                         }
2256
2257                 /*  Note: no authenticator is not considered an error,
2258                 **  but will return authtime == 0.
2259                 */
2260                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2261                                         &authtime, &kssl_err)) != 0)
2262                         {
2263 #ifdef KSSL_DEBUG
2264                         printf("kssl_check_authent rtn %d [%d]\n",
2265                                 krb5rc, kssl_err.reason);
2266                         if (kssl_err.text)
2267                                 printf("kssl_err text= %s\n", kssl_err.text);
2268 #endif  /* KSSL_DEBUG */
2269                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2270                                 kssl_err.reason);
2271                         goto err;
2272                         }
2273
2274                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2275                         {
2276                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2277                         goto err;
2278                         }
2279
2280 #ifdef KSSL_DEBUG
2281                 kssl_ctx_show(kssl_ctx);
2282 #endif  /* KSSL_DEBUG */
2283
2284                 enc = kssl_map_enc(kssl_ctx->enctype);
2285                 if (enc == NULL)
2286                     goto err;
2287
2288                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2289
2290                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2291                         {
2292                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2293                                 SSL_R_DECRYPTION_FAILED);
2294                         goto err;
2295                         }
2296                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2297                                         (unsigned char *)enc_pms.data, enc_pms.length))
2298                         {
2299                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2300                                 SSL_R_DECRYPTION_FAILED);
2301                         goto err;
2302                         }
2303                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2304                         {
2305                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2306                                 SSL_R_DATA_LENGTH_TOO_LONG);
2307                         goto err;
2308                         }
2309                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2310                         {
2311                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2312                                 SSL_R_DECRYPTION_FAILED);
2313                         goto err;
2314                         }
2315                 outl += padl;
2316                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2317                         {
2318                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2319                                 SSL_R_DATA_LENGTH_TOO_LONG);
2320                         goto err;
2321                         }
2322                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2323                     {
2324                     /* The premaster secret must contain the same version number as the
2325                      * ClientHello to detect version rollback attacks (strangely, the
2326                      * protocol does not offer such protection for DH ciphersuites).
2327                      * However, buggy clients exist that send random bytes instead of
2328                      * the protocol version.
2329                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2330                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2331                      */
2332                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2333                         {
2334                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2335                                SSL_AD_DECODE_ERROR);
2336                         goto err;
2337                         }
2338                     }
2339
2340                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2341
2342                 s->session->master_key_length=
2343                         s->method->ssl3_enc->generate_master_secret(s,
2344                                 s->session->master_key, pms, outl);
2345
2346                 if (kssl_ctx->client_princ)
2347                         {
2348                         size_t len = strlen(kssl_ctx->client_princ);
2349                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2350                                 {
2351                                 s->session->krb5_client_princ_len = len;
2352                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2353                                 }
2354                         }
2355
2356
2357                 /*  Was doing kssl_ctx_free() here,
2358                 **  but it caused problems for apache.
2359                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2360                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2361                 */
2362                 }
2363         else
2364 #endif  /* OPENSSL_NO_KRB5 */
2365
2366 #ifndef OPENSSL_NO_ECDH
2367                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2368                 {
2369                 int ret = 1;
2370                 int field_size = 0;
2371                 const EC_KEY   *tkey;
2372                 const EC_GROUP *group;
2373                 const BIGNUM *priv_key;
2374
2375                 /* initialize structures for server's ECDH key pair */
2376                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2377                         {
2378                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2379                             ERR_R_MALLOC_FAILURE);
2380                         goto err;
2381                         }
2382
2383                 /* Let's get server private key and group information */
2384                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2385                         { 
2386                         /* use the certificate */
2387                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2388                         }
2389                 else
2390                         {
2391                         /* use the ephermeral values we saved when
2392                          * generating the ServerKeyExchange msg.
2393                          */
2394                         tkey = s->s3->tmp.ecdh;
2395                         }
2396
2397                 group    = EC_KEY_get0_group(tkey);
2398                 priv_key = EC_KEY_get0_private_key(tkey);
2399
2400                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2401                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2402                         {
2403                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2404                                ERR_R_EC_LIB);
2405                         goto err;
2406                         }
2407
2408                 /* Let's get client's public key */
2409                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2410                         {
2411                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2412                             ERR_R_MALLOC_FAILURE);
2413                         goto err;
2414                         }
2415
2416                 if (n == 0L) 
2417                         {
2418                         /* Client Publickey was in Client Certificate */
2419
2420                          if (alg_k & SSL_kEECDH)
2421                                  {
2422                                  al=SSL_AD_HANDSHAKE_FAILURE;
2423                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2424                                  goto f_err;
2425                                  }
2426                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2427                             == NULL) || 
2428                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2429                                 {
2430                                 /* XXX: For now, we do not support client
2431                                  * authentication using ECDH certificates
2432                                  * so this branch (n == 0L) of the code is
2433                                  * never executed. When that support is
2434                                  * added, we ought to ensure the key 
2435                                  * received in the certificate is 
2436                                  * authorized for key agreement.
2437                                  * ECDH_compute_key implicitly checks that
2438                                  * the two ECDH shares are for the same
2439                                  * group.
2440                                  */
2441                                 al=SSL_AD_HANDSHAKE_FAILURE;
2442                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2443                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2444                                 goto f_err;
2445                                 }
2446
2447                         if (EC_POINT_copy(clnt_ecpoint,
2448                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2449                                 {
2450                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2451                                         ERR_R_EC_LIB);
2452                                 goto err;
2453                                 }
2454                         ret = 2; /* Skip certificate verify processing */
2455                         }
2456                 else
2457                         {
2458                         /* Get client's public key from encoded point
2459                          * in the ClientKeyExchange message.
2460                          */
2461                         if ((bn_ctx = BN_CTX_new()) == NULL)
2462                                 {
2463                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2464                                     ERR_R_MALLOC_FAILURE);
2465                                 goto err;
2466                                 }
2467
2468                         /* Get encoded point length */
2469                         i = *p; 
2470                         p += 1;
2471                         if (EC_POINT_oct2point(group, 
2472                             clnt_ecpoint, p, i, bn_ctx) == 0)
2473                                 {
2474                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2475                                     ERR_R_EC_LIB);
2476                                 goto err;
2477                                 }
2478                         /* p is pointing to somewhere in the buffer
2479                          * currently, so set it to the start 
2480                          */ 
2481                         p=(unsigned char *)s->init_buf->data;
2482                         }
2483
2484                 /* Compute the shared pre-master secret */
2485                 field_size = EC_GROUP_get_degree(group);
2486                 if (field_size <= 0)
2487                         {
2488                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2489                                ERR_R_ECDH_LIB);
2490                         goto err;
2491                         }
2492                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2493                 if (i <= 0)
2494                         {
2495                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2496                             ERR_R_ECDH_LIB);
2497                         goto err;
2498                         }
2499
2500                 EVP_PKEY_free(clnt_pub_pkey);
2501                 EC_POINT_free(clnt_ecpoint);
2502                 EC_KEY_free(srvr_ecdh);
2503                 BN_CTX_free(bn_ctx);
2504                 EC_KEY_free(s->s3->tmp.ecdh);
2505                 s->s3->tmp.ecdh = NULL; 
2506
2507                 /* Compute the master secret */
2508                 s->session->master_key_length = s->method->ssl3_enc-> \
2509                     generate_master_secret(s, s->session->master_key, p, i);
2510                 
2511                 OPENSSL_cleanse(p, i);
2512                 return (ret);
2513                 }
2514         else
2515 #endif
2516 #ifndef OPENSSL_NO_PSK
2517                 if (alg_k & SSL_kPSK)
2518                         {
2519                         unsigned char *t = NULL;
2520                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2521                         unsigned int pre_ms_len = 0, psk_len = 0;
2522                         int psk_err = 1;
2523                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2524
2525                         al=SSL_AD_HANDSHAKE_FAILURE;
2526
2527                         n2s(p,i);
2528                         if (n != i+2)
2529                                 {
2530                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2531                                         SSL_R_LENGTH_MISMATCH);
2532                                 goto psk_err;
2533                                 }
2534                         if (i > PSK_MAX_IDENTITY_LEN)
2535                                 {
2536                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2537                                         SSL_R_DATA_LENGTH_TOO_LONG);
2538                                 goto psk_err;
2539                                 }
2540                         if (s->psk_server_callback == NULL)
2541                                 {
2542                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2543                                        SSL_R_PSK_NO_SERVER_CB);
2544                                 goto psk_err;
2545                                 }
2546
2547                         /* Create guaranteed NULL-terminated identity
2548                          * string for the callback */
2549                         memcpy(tmp_id, p, i);
2550                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2551                         psk_len = s->psk_server_callback(s, tmp_id,
2552                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2553                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2554
2555                         if (psk_len > PSK_MAX_PSK_LEN)
2556                                 {
2557                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2558                                         ERR_R_INTERNAL_ERROR);
2559                                 goto psk_err;
2560                                 }
2561                         else if (psk_len == 0)
2562                                 {
2563                                 /* PSK related to the given identity not found */
2564                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2565                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2566                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2567                                 goto psk_err;
2568                                 }
2569
2570                         /* create PSK pre_master_secret */
2571                         pre_ms_len=2+psk_len+2+psk_len;
2572                         t = psk_or_pre_ms;
2573                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2574                         s2n(psk_len, t);
2575                         memset(t, 0, psk_len);
2576                         t+=psk_len;
2577                         s2n(psk_len, t);
2578
2579                         if (s->session->psk_identity != NULL)
2580                                 OPENSSL_free(s->session->psk_identity);
2581                         s->session->psk_identity = BUF_strdup((char *)p);
2582                         if (s->session->psk_identity == NULL)
2583                                 {
2584                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2585                                         ERR_R_MALLOC_FAILURE);
2586                                 goto psk_err;
2587                                 }
2588
2589                         if (s->session->psk_identity_hint != NULL)
2590                                 OPENSSL_free(s->session->psk_identity_hint);
2591                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2592                         if (s->ctx->psk_identity_hint != NULL &&
2593                                 s->session->psk_identity_hint == NULL)
2594                                 {
2595                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2596                                         ERR_R_MALLOC_FAILURE);
2597                                 goto psk_err;
2598                                 }
2599
2600                         s->session->master_key_length=
2601                                 s->method->ssl3_enc->generate_master_secret(s,
2602                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2603                         psk_err = 0;
2604                 psk_err:
2605                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2606                         if (psk_err != 0)
2607                                 goto f_err;
2608                         }
2609                 else
2610 #endif
2611                 if (alg_k & SSL_kGOST) 
2612                         {
2613                         int ret = 0;
2614                         EVP_PKEY_CTX *pkey_ctx;
2615                         EVP_PKEY *client_pub_pkey = NULL;
2616                         unsigned char premaster_secret[32], *start;
2617                         size_t outlen=32, inlen;                        
2618
2619                         /* Get our certificate private key*/
2620                         pkey_ctx = EVP_PKEY_CTX_new(s->cert->key->privatekey,NULL);     
2621                         EVP_PKEY_decrypt_init(pkey_ctx);
2622                         /* If client certificate is present and is of the same type, maybe
2623                          * use it for key exchange.  Don't mind errors from
2624                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2625                          * a client certificate for authorization only. */
2626                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2627                         if (client_pub_pkey)
2628                                 {
2629                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2630                                         ERR_clear_error();
2631                                 }
2632                         /* Decrypt session key */
2633                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2634                                 {
2635                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2636                                 goto gerr;
2637                                 }
2638                         if (p[1] == 0x81)
2639                                 {
2640                                 start = p+3;
2641                                 inlen = p[2];
2642                                 }
2643                         else if (p[1] < 0x80)
2644                                 {
2645                                 start = p+2;
2646                                 inlen = p[1];
2647                                 }
2648                         else
2649                                 {
2650                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2651                                 goto gerr;
2652                                 }
2653                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2654
2655                                 {
2656                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2657                                 goto gerr;
2658                                 }
2659                         /* Generate master secret */
2660                         s->session->master_key_length=
2661                                 s->method->ssl3_enc->generate_master_secret(s,
2662                                         s->session->master_key,premaster_secret,32);
2663                         /* Check if pubkey from client certificate was used */
2664                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2665                                 ret = 2;
2666                         else
2667                                 ret = 1;
2668                 gerr:
2669                         EVP_PKEY_free(client_pub_pkey);
2670                         EVP_PKEY_CTX_free(pkey_ctx);
2671                         if (ret)
2672                                 return ret;
2673                         else
2674                                 goto err;
2675                         }
2676                 else
2677                 {
2678                 al=SSL_AD_HANDSHAKE_FAILURE;
2679                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2680                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2681                 goto f_err;
2682                 }
2683
2684         return(1);
2685 f_err:
2686         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2687 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2688 err:
2689 #endif
2690 #ifndef OPENSSL_NO_ECDH
2691         EVP_PKEY_free(clnt_pub_pkey);
2692         EC_POINT_free(clnt_ecpoint);
2693         if (srvr_ecdh != NULL) 
2694                 EC_KEY_free(srvr_ecdh);
2695         BN_CTX_free(bn_ctx);
2696 #endif
2697         return(-1);
2698         }
2699
2700 int ssl3_get_cert_verify(SSL *s)
2701         {
2702         EVP_PKEY *pkey=NULL;
2703         unsigned char *p;
2704         int al,ok,ret=0;
2705         long n;
2706         int type=0,i,j;
2707         X509 *peer;
2708
2709         n=s->method->ssl_get_message(s,
2710                 SSL3_ST_SR_CERT_VRFY_A,
2711                 SSL3_ST_SR_CERT_VRFY_B,
2712                 -1,
2713                 514, /* 514? */
2714                 &ok);
2715
2716         if (!ok) return((int)n);
2717
2718         if (s->session->peer != NULL)
2719                 {
2720                 peer=s->session->peer;
2721                 pkey=X509_get_pubkey(peer);
2722                 type=X509_certificate_type(peer,pkey);
2723                 }
2724         else
2725                 {
2726                 peer=NULL;
2727                 pkey=NULL;
2728                 }
2729
2730         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2731                 {
2732                 s->s3->tmp.reuse_message=1;
2733                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2734                         {
2735                         al=SSL_AD_UNEXPECTED_MESSAGE;
2736                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2737                         goto f_err;
2738                         }
2739                 ret=1;
2740                 goto end;
2741                 }
2742
2743         if (peer == NULL)
2744                 {
2745                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2746                 al=SSL_AD_UNEXPECTED_MESSAGE;
2747                 goto f_err;
2748                 }
2749
2750         if (!(type & EVP_PKT_SIGN))
2751                 {
2752                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2753                 al=SSL_AD_ILLEGAL_PARAMETER;
2754                 goto f_err;
2755                 }
2756
2757         if (s->s3->change_cipher_spec)
2758                 {
2759                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2760                 al=SSL_AD_UNEXPECTED_MESSAGE;
2761                 goto f_err;
2762                 }
2763
2764         /* we now have a signature that we need to verify */
2765         p=(unsigned char *)s->init_msg;
2766         /* Check for broken implementations of GOST ciphersuites */
2767         /* If key is GOST and n is exactly 64, it is bare
2768          * signature without length field */
2769         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2770                 pkey->type == NID_id_GostR3410_2001) )
2771                 {
2772                 i=64;
2773                 } 
2774         else 
2775                 {       
2776                 n2s(p,i);
2777                 n-=2;
2778                 if (i > n)
2779                         {
2780                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2781                         al=SSL_AD_DECODE_ERROR;
2782                         goto f_err;
2783                         }
2784         }
2785         j=EVP_PKEY_size(pkey);
2786         if ((i > j) || (n > j) || (n <= 0))
2787                 {
2788                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2789                 al=SSL_AD_DECODE_ERROR;
2790                 goto f_err;
2791                 }
2792
2793 #ifndef OPENSSL_NO_RSA 
2794         if (pkey->type == EVP_PKEY_RSA)
2795                 {
2796                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2797                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
2798                                                         pkey->pkey.rsa);
2799                 if (i < 0)
2800                         {
2801                         al=SSL_AD_DECRYPT_ERROR;
2802                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2803                         goto f_err;
2804                         }
2805                 if (i == 0)
2806                         {
2807                         al=SSL_AD_DECRYPT_ERROR;
2808                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2809                         goto f_err;
2810                         }
2811                 }
2812         else
2813 #endif
2814 #ifndef OPENSSL_NO_DSA
2815                 if (pkey->type == EVP_PKEY_DSA)
2816                 {
2817                 j=DSA_verify(pkey->save_type,
2818                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2819                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2820                 if (j <= 0)
2821                         {
2822                         /* bad signature */
2823                         al=SSL_AD_DECRYPT_ERROR;
2824                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2825                         goto f_err;
2826                         }
2827                 }
2828         else
2829 #endif
2830 #ifndef OPENSSL_NO_ECDSA
2831                 if (pkey->type == EVP_PKEY_EC)
2832                 {
2833                 j=ECDSA_verify(pkey->save_type,
2834                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2835                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2836                 if (j <= 0)
2837                         {
2838                         /* bad signature */
2839                         al=SSL_AD_DECRYPT_ERROR;
2840                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2841                             SSL_R_BAD_ECDSA_SIGNATURE);
2842                         goto f_err;
2843                         }
2844                 }
2845         else
2846 #endif
2847         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2848                 {   unsigned char signature[64];
2849                         int idx;
2850                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2851                         EVP_PKEY_verify_init(pctx);
2852                         if (i!=64) {
2853                                 fprintf(stderr,"GOST signature length is %d",i);
2854                         }       
2855                         for (idx=0;idx<64;idx++) {
2856                                 signature[63-idx]=p[idx];
2857                         }       
2858                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2859                         EVP_PKEY_CTX_free(pctx);
2860                         if (j<=0) 
2861                                 {
2862                                 al=SSL_AD_DECRYPT_ERROR;
2863                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2864                                         SSL_R_BAD_ECDSA_SIGNATURE);
2865                                 goto f_err;
2866                                 }       
2867                 }
2868         else    
2869                 {
2870                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2871                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2872                 goto f_err;
2873                 }
2874
2875
2876         ret=1;
2877         if (0)
2878                 {
2879 f_err:
2880                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2881                 }
2882 end:
2883         EVP_PKEY_free(pkey);
2884         return(ret);
2885         }
2886
2887 int ssl3_get_client_certificate(SSL *s)
2888         {
2889         int i,ok,al,ret= -1;
2890         X509 *x=NULL;
2891         unsigned long l,nc,llen,n;
2892         const unsigned char *p,*q;
2893         unsigned char *d;
2894         STACK_OF(X509) *sk=NULL;
2895
2896         n=s->method->ssl_get_message(s,
2897                 SSL3_ST_SR_CERT_A,
2898                 SSL3_ST_SR_CERT_B,
2899                 -1,
2900                 s->max_cert_list,
2901                 &ok);
2902
2903         if (!ok) return((int)n);
2904
2905         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2906                 {
2907                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2908                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2909                         {
2910                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2911                         al=SSL_AD_HANDSHAKE_FAILURE;
2912                         goto f_err;
2913                         }
2914                 /* If tls asked for a client cert, the client must return a 0 list */
2915                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2916                         {
2917                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2918                         al=SSL_AD_UNEXPECTED_MESSAGE;
2919                         goto f_err;
2920                         }
2921                 s->s3->tmp.reuse_message=1;
2922                 return(1);
2923                 }
2924
2925         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2926                 {
2927                 al=SSL_AD_UNEXPECTED_MESSAGE;
2928                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2929                 goto f_err;
2930                 }
2931         p=d=(unsigned char *)s->init_msg;
2932
2933         if ((sk=sk_X509_new_null()) == NULL)
2934                 {
2935                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2936                 goto err;
2937                 }
2938
2939         n2l3(p,llen);
2940         if (llen+3 != n)
2941                 {
2942                 al=SSL_AD_DECODE_ERROR;
2943                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2944                 goto f_err;
2945                 }
2946         for (nc=0; nc<llen; )
2947                 {
2948                 n2l3(p,l);
2949                 if ((l+nc+3) > llen)
2950                         {
2951                         al=SSL_AD_DECODE_ERROR;
2952                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2953                         goto f_err;
2954                         }
2955
2956                 q=p;
2957                 x=d2i_X509(NULL,&p,l);
2958                 if (x == NULL)
2959                         {
2960                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2961                         goto err;
2962                         }
2963                 if (p != (q+l))
2964                         {
2965                         al=SSL_AD_DECODE_ERROR;
2966                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2967                         goto f_err;
2968                         }
2969                 if (!sk_X509_push(sk,x))
2970                         {
2971