56611996b3e8065c26ce9fb3f60db32b500212da
[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->renegotiate=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->renegotiate = 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->renegotiate == 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->renegotiate=0;
715                                 s->new_session=0;
716                                 
717                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
718                                 
719                                 s->ctx->stats.sess_accept_good++;
720                                 /* s->server=1; */
721                                 s->handshake_func=ssl3_accept;
722
723                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
724                                 }
725                         
726                         ret = 1;
727                         goto end;
728                         /* break; */
729
730                 default:
731                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
732                         ret= -1;
733                         goto end;
734                         /* break; */
735                         }
736                 
737                 if (!s->s3->tmp.reuse_message && !skip)
738                         {
739                         if (s->debug)
740                                 {
741                                 if ((ret=BIO_flush(s->wbio)) <= 0)
742                                         goto end;
743                                 }
744
745
746                         if ((cb != NULL) && (s->state != state))
747                                 {
748                                 new_state=s->state;
749                                 s->state=state;
750                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
751                                 s->state=new_state;
752                                 }
753                         }
754                 skip=0;
755                 }
756 end:
757         /* BIO_flush(s->wbio); */
758
759         s->in_handshake--;
760         if (cb != NULL)
761                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
762         return(ret);
763         }
764
765 int ssl3_send_hello_request(SSL *s)
766         {
767         unsigned char *p;
768
769         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
770                 {
771                 p=(unsigned char *)s->init_buf->data;
772                 *(p++)=SSL3_MT_HELLO_REQUEST;
773                 *(p++)=0;
774                 *(p++)=0;
775                 *(p++)=0;
776
777                 s->state=SSL3_ST_SW_HELLO_REQ_B;
778                 /* number of bytes to write */
779                 s->init_num=4;
780                 s->init_off=0;
781                 }
782
783         /* SSL3_ST_SW_HELLO_REQ_B */
784         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
785         }
786
787 int ssl3_check_client_hello(SSL *s)
788         {
789         int ok;
790         long n;
791
792         /* this function is called when we really expect a Certificate message,
793          * so permit appropriate message length */
794         n=s->method->ssl_get_message(s,
795                 SSL3_ST_SR_CERT_A,
796                 SSL3_ST_SR_CERT_B,
797                 -1,
798                 s->max_cert_list,
799                 &ok);
800         if (!ok) return((int)n);
801         s->s3->tmp.reuse_message = 1;
802         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
803                 {
804                 /* Throw away what we have done so far in the current handshake,
805                  * which will now be aborted. (A full SSL_clear would be too much.)
806                  * I hope that tmp.dh is the only thing that may need to be cleared
807                  * when a handshake is not completed ... */
808 #ifndef OPENSSL_NO_DH
809                 if (s->s3->tmp.dh != NULL)
810                         {
811                         DH_free(s->s3->tmp.dh);
812                         s->s3->tmp.dh = NULL;
813                         }
814 #endif
815                 return 2;
816                 }
817         return 1;
818 }
819
820 int ssl3_get_client_hello(SSL *s)
821         {
822         int i,j,ok,al,ret= -1;
823         unsigned int cookie_len;
824         long n;
825         unsigned long id;
826         unsigned char *p,*d,*q;
827         SSL_CIPHER *c;
828 #ifndef OPENSSL_NO_COMP
829         SSL_COMP *comp=NULL;
830 #endif
831         STACK_OF(SSL_CIPHER) *ciphers=NULL;
832
833         /* We do this so that we will respond with our native type.
834          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
835          * This down switching should be handled by a different method.
836          * If we are SSLv3, we will respond with SSLv3, even if prompted with
837          * TLSv1.
838          */
839         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
840                 {
841                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
842                 }
843         s->first_packet=1;
844         n=s->method->ssl_get_message(s,
845                 SSL3_ST_SR_CLNT_HELLO_B,
846                 SSL3_ST_SR_CLNT_HELLO_C,
847                 SSL3_MT_CLIENT_HELLO,
848                 SSL3_RT_MAX_PLAIN_LENGTH,
849                 &ok);
850
851         if (!ok) return((int)n);
852         s->first_packet=0;
853         d=p=(unsigned char *)s->init_msg;
854
855         /* use version from inside client hello, not from record header
856          * (may differ: see RFC 2246, Appendix E, second paragraph) */
857         s->client_version=(((int)p[0])<<8)|(int)p[1];
858         p+=2;
859
860         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
861             (s->version != DTLS1_VERSION && s->client_version < s->version))
862                 {
863                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
864                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
865                         {
866                         /* similar to ssl3_get_record, send alert using remote version number */
867                         s->version = s->client_version;
868                         }
869                 al = SSL_AD_PROTOCOL_VERSION;
870                 goto f_err;
871                 }
872
873         /* If we require cookies and this ClientHello doesn't
874          * contain one, just return since we do not want to
875          * allocate any memory yet. So check cookie length...
876          */
877         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
878                 {
879                 unsigned int session_length, cookie_length;
880                 
881                 session_length = *(p + SSL3_RANDOM_SIZE);
882                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
883
884                 if (cookie_length == 0)
885                         return 1;
886                 }
887
888         /* load the client random */
889         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
890         p+=SSL3_RANDOM_SIZE;
891
892         /* get the session-id */
893         j= *(p++);
894
895         s->hit=0;
896         /* Versions before 0.9.7 always allow session reuse during renegotiation
897          * (i.e. when s->new_session is true), option
898          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
899          * Maybe this optional behaviour should always have been the default,
900          * but we cannot safely change the default behaviour (or new applications
901          * might be written that become totally unsecure when compiled with
902          * an earlier library version)
903          */
904         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
905                 {
906                 if (!ssl_get_new_session(s,1))
907                         goto err;
908                 }
909         else
910                 {
911                 i=ssl_get_prev_session(s, p, j, d + n);
912                 if (i == 1)
913                         { /* previous session */
914                         s->hit=1;
915                         }
916                 else if (i == -1)
917                         goto err;
918                 else /* i == 0 */
919                         {
920                         if (!ssl_get_new_session(s,1))
921                                 goto err;
922                         }
923                 }
924
925         p+=j;
926
927         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
928                 {
929                 /* cookie stuff */
930                 cookie_len = *(p++);
931
932                 /* 
933                  * The ClientHello may contain a cookie even if the
934                  * HelloVerify message has not been sent--make sure that it
935                  * does not cause an overflow.
936                  */
937                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
938                         {
939                         /* too much data */
940                         al = SSL_AD_DECODE_ERROR;
941                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
942                         goto f_err;
943                         }
944
945                 /* verify the cookie if appropriate option is set. */
946                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
947                         cookie_len > 0)
948                         {
949                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
950
951                         if ( s->ctx->app_verify_cookie_cb != NULL)
952                                 {
953                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
954                                         cookie_len) == 0)
955                                         {
956                                         al=SSL_AD_HANDSHAKE_FAILURE;
957                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
958                                                 SSL_R_COOKIE_MISMATCH);
959                                         goto f_err;
960                                         }
961                                 /* else cookie verification succeeded */
962                                 }
963                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
964                                                   s->d1->cookie_len) != 0) /* default verification */
965                                 {
966                                         al=SSL_AD_HANDSHAKE_FAILURE;
967                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
968                                                 SSL_R_COOKIE_MISMATCH);
969                                         goto f_err;
970                                 }
971
972                         ret = 2;
973                         }
974
975                 p += cookie_len;
976                 }
977
978         n2s(p,i);
979         if ((i == 0) && (j != 0))
980                 {
981                 /* we need a cipher if we are not resuming a session */
982                 al=SSL_AD_ILLEGAL_PARAMETER;
983                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
984                 goto f_err;
985                 }
986         if ((p+i) >= (d+n))
987                 {
988                 /* not enough data */
989                 al=SSL_AD_DECODE_ERROR;
990                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
991                 goto f_err;
992                 }
993         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
994                 == NULL))
995                 {
996                 goto err;
997                 }
998         p+=i;
999
1000         /* If it is a hit, check that the cipher is in the list */
1001         if ((s->hit) && (i > 0))
1002                 {
1003                 j=0;
1004                 id=s->session->cipher->id;
1005
1006 #ifdef CIPHER_DEBUG
1007                 printf("client sent %d ciphers\n",sk_num(ciphers));
1008 #endif
1009                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1010                         {
1011                         c=sk_SSL_CIPHER_value(ciphers,i);
1012 #ifdef CIPHER_DEBUG
1013                         printf("client [%2d of %2d]:%s\n",
1014                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1015 #endif
1016                         if (c->id == id)
1017                                 {
1018                                 j=1;
1019                                 break;
1020                                 }
1021                         }
1022                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1023                         {
1024                         /* Special case as client bug workaround: the previously used cipher may
1025                          * not be in the current list, the client instead might be trying to
1026                          * continue using a cipher that before wasn't chosen due to server
1027                          * preferences.  We'll have to reject the connection if the cipher is not
1028                          * enabled, though. */
1029                         c = sk_SSL_CIPHER_value(ciphers, 0);
1030                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1031                                 {
1032                                 s->session->cipher = c;
1033                                 j = 1;
1034                                 }
1035                         }
1036                 if (j == 0)
1037                         {
1038                         /* we need to have the cipher in the cipher
1039                          * list if we are asked to reuse it */
1040                         al=SSL_AD_ILLEGAL_PARAMETER;
1041                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1042                         goto f_err;
1043                         }
1044                 }
1045
1046         /* compression */
1047         i= *(p++);
1048         if ((p+i) > (d+n))
1049                 {
1050                 /* not enough data */
1051                 al=SSL_AD_DECODE_ERROR;
1052                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1053                 goto f_err;
1054                 }
1055         q=p;
1056         for (j=0; j<i; j++)
1057                 {
1058                 if (p[j] == 0) break;
1059                 }
1060
1061         p+=i;
1062         if (j >= i)
1063                 {
1064                 /* no compress */
1065                 al=SSL_AD_DECODE_ERROR;
1066                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1067                 goto f_err;
1068                 }
1069
1070 #ifndef OPENSSL_NO_TLSEXT
1071         /* TLS extensions*/
1072         if (s->version >= SSL3_VERSION)
1073                 {
1074                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1075                         {
1076                         /* 'al' set by ssl_parse_clienthello_tlsext */
1077                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1078                         goto f_err;
1079                         }
1080                 }
1081                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1082                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1083                         goto err;
1084                 }
1085
1086         /* Check if we want to use external pre-shared secret for this
1087          * handshake for not reused session only. We need to generate
1088          * server_random before calling tls_session_secret_cb in order to allow
1089          * SessionTicket processing to use it in key derivation. */
1090         {
1091                 unsigned long Time;
1092                 unsigned char *pos;
1093                 Time=(unsigned long)time(NULL);                 /* Time */
1094                 pos=s->s3->server_random;
1095                 l2n(Time,pos);
1096                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1097                         {
1098                         al=SSL_AD_INTERNAL_ERROR;
1099                         goto f_err;
1100                         }
1101         }
1102
1103         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1104                 {
1105                 SSL_CIPHER *pref_cipher=NULL;
1106
1107                 s->session->master_key_length=sizeof(s->session->master_key);
1108                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1109                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1110                         {
1111                         s->hit=1;
1112                         s->session->ciphers=ciphers;
1113                         s->session->verify_result=X509_V_OK;
1114
1115                         ciphers=NULL;
1116
1117                         /* check if some cipher was preferred by call back */
1118                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1119                         if (pref_cipher == NULL)
1120                                 {
1121                                 al=SSL_AD_HANDSHAKE_FAILURE;
1122                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1123                                 goto f_err;
1124                                 }
1125
1126                         s->session->cipher=pref_cipher;
1127
1128                         if (s->cipher_list)
1129                                 sk_SSL_CIPHER_free(s->cipher_list);
1130
1131                         if (s->cipher_list_by_id)
1132                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1133
1134                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1135                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1136                         }
1137                 }
1138 #endif
1139
1140         /* Worst case, we will use the NULL compression, but if we have other
1141          * options, we will now look for them.  We have i-1 compression
1142          * algorithms from the client, starting at q. */
1143         s->s3->tmp.new_compression=NULL;
1144 #ifndef OPENSSL_NO_COMP
1145         /* This only happens if we have a cache hit */
1146         if (s->session->compress_meth != 0)
1147                 {
1148                 int m, comp_id = s->session->compress_meth;
1149                 /* Perform sanity checks on resumed compression algorithm */
1150                 /* Can't disable compression */
1151                 if (s->options & SSL_OP_NO_COMPRESSION)
1152                         {
1153                         al=SSL_AD_INTERNAL_ERROR;
1154                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1155                         goto f_err;
1156                         }
1157                 /* Look for resumed compression method */
1158                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1159                         {
1160                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1161                         if (comp_id == comp->id)
1162                                 {
1163                                 s->s3->tmp.new_compression=comp;
1164                                 break;
1165                                 }
1166                         }
1167                 if (s->s3->tmp.new_compression == NULL)
1168                         {
1169                         al=SSL_AD_INTERNAL_ERROR;
1170                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1171                         goto f_err;
1172                         }
1173                 /* Look for resumed method in compression list */
1174                 for (m = 0; m < i; m++)
1175                         {
1176                         if (q[m] == comp_id)
1177                                 break;
1178                         }
1179                 if (m >= i)
1180                         {
1181                         al=SSL_AD_ILLEGAL_PARAMETER;
1182                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1183                         goto f_err;
1184                         }
1185                 }
1186         else if (s->hit)
1187                 comp = NULL;
1188         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1189                 { /* See if we have a match */
1190                 int m,nn,o,v,done=0;
1191
1192                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1193                 for (m=0; m<nn; m++)
1194                         {
1195                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1196                         v=comp->id;
1197                         for (o=0; o<i; o++)
1198                                 {
1199                                 if (v == q[o])
1200                                         {
1201                                         done=1;
1202                                         break;
1203                                         }
1204                                 }
1205                         if (done) break;
1206                         }
1207                 if (done)
1208                         s->s3->tmp.new_compression=comp;
1209                 else
1210                         comp=NULL;
1211                 }
1212 #else
1213         /* If compression is disabled we'd better not try to resume a session
1214          * using compression.
1215          */
1216         if (s->session->compress_meth != 0)
1217                 {
1218                 al=SSL_AD_INTERNAL_ERROR;
1219                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1220                 goto f_err;
1221                 }
1222 #endif
1223
1224         /* Given s->session->ciphers and SSL_get_ciphers, we must
1225          * pick a cipher */
1226
1227         if (!s->hit)
1228                 {
1229 #ifdef OPENSSL_NO_COMP
1230                 s->session->compress_meth=0;
1231 #else
1232                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1233 #endif
1234                 if (s->session->ciphers != NULL)
1235                         sk_SSL_CIPHER_free(s->session->ciphers);
1236                 s->session->ciphers=ciphers;
1237                 if (ciphers == NULL)
1238                         {
1239                         al=SSL_AD_ILLEGAL_PARAMETER;
1240                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1241                         goto f_err;
1242                         }
1243                 ciphers=NULL;
1244                 c=ssl3_choose_cipher(s,s->session->ciphers,
1245                                      SSL_get_ciphers(s));
1246
1247                 if (c == NULL)
1248                         {
1249                         al=SSL_AD_HANDSHAKE_FAILURE;
1250                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1251                         goto f_err;
1252                         }
1253                 s->s3->tmp.new_cipher=c;
1254                 /* check whether we should disable session resumption */
1255                 if (s->not_resumable_session_cb != NULL)
1256                         s->session->not_resumable=s->not_resumable_session_cb(s,
1257                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1258                 if (s->session->not_resumable)
1259                         /* do not send a session ticket */
1260                         s->tlsext_ticket_expected = 0;
1261                 }
1262         else
1263                 {
1264                 /* Session-id reuse */
1265 #ifdef REUSE_CIPHER_BUG
1266                 STACK_OF(SSL_CIPHER) *sk;
1267                 SSL_CIPHER *nc=NULL;
1268                 SSL_CIPHER *ec=NULL;
1269
1270                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1271                         {
1272                         sk=s->session->ciphers;
1273                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1274                                 {
1275                                 c=sk_SSL_CIPHER_value(sk,i);
1276                                 if (c->algorithm_enc & SSL_eNULL)
1277                                         nc=c;
1278                                 if (SSL_C_IS_EXPORT(c))
1279                                         ec=c;
1280                                 }
1281                         if (nc != NULL)
1282                                 s->s3->tmp.new_cipher=nc;
1283                         else if (ec != NULL)
1284                                 s->s3->tmp.new_cipher=ec;
1285                         else
1286                                 s->s3->tmp.new_cipher=s->session->cipher;
1287                         }
1288                 else
1289 #endif
1290                 s->s3->tmp.new_cipher=s->session->cipher;
1291                 }
1292
1293         if (!ssl3_digest_cached_records(s))
1294                 goto f_err;
1295         
1296         /* we now have the following setup. 
1297          * client_random
1298          * cipher_list          - our prefered list of ciphers
1299          * ciphers              - the clients prefered list of ciphers
1300          * compression          - basically ignored right now
1301          * ssl version is set   - sslv3
1302          * s->session           - The ssl session has been setup.
1303          * s->hit               - session reuse flag
1304          * s->tmp.new_cipher    - the new cipher to use.
1305          */
1306
1307         if (ret < 0) ret=1;
1308         if (0)
1309                 {
1310 f_err:
1311                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1312                 }
1313 err:
1314         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1315         return(ret);
1316         }
1317
1318 int ssl3_send_server_hello(SSL *s)
1319         {
1320         unsigned char *buf;
1321         unsigned char *p,*d;
1322         int i,sl;
1323         unsigned long l;
1324 #ifdef OPENSSL_NO_TLSEXT
1325         unsigned long Time;
1326 #endif
1327
1328         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1329                 {
1330                 buf=(unsigned char *)s->init_buf->data;
1331 #ifdef OPENSSL_NO_TLSEXT
1332                 p=s->s3->server_random;
1333                 /* Generate server_random if it was not needed previously */
1334                 Time=(unsigned long)time(NULL);                 /* Time */
1335                 l2n(Time,p);
1336                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1337                         return -1;
1338 #endif
1339                 /* Do the message type and length last */
1340                 d=p= &(buf[4]);
1341
1342                 *(p++)=s->version>>8;
1343                 *(p++)=s->version&0xff;
1344
1345                 /* Random stuff */
1346                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1347                 p+=SSL3_RANDOM_SIZE;
1348
1349                 /* now in theory we have 3 options to sending back the
1350                  * session id.  If it is a re-use, we send back the
1351                  * old session-id, if it is a new session, we send
1352                  * back the new session-id or we send back a 0 length
1353                  * session-id if we want it to be single use.
1354                  * Currently I will not implement the '0' length session-id
1355                  * 12-Jan-98 - I'll now support the '0' length stuff.
1356                  *
1357                  * We also have an additional case where stateless session
1358                  * resumption is successful: we always send back the old
1359                  * session id. In this case s->hit is non zero: this can
1360                  * only happen if stateless session resumption is succesful
1361                  * if session caching is disabled so existing functionality
1362                  * is unaffected.
1363                  */
1364                 if (s->session->not_resumable ||
1365                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1366                                 && !s->hit))
1367                         s->session->session_id_length=0;
1368
1369                 sl=s->session->session_id_length;
1370                 if (sl > (int)sizeof(s->session->session_id))
1371                         {
1372                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1373                         return -1;
1374                         }
1375                 *(p++)=sl;
1376                 memcpy(p,s->session->session_id,sl);
1377                 p+=sl;
1378
1379                 /* put the cipher */
1380                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1381                 p+=i;
1382
1383                 /* put the compression method */
1384 #ifdef OPENSSL_NO_COMP
1385                         *(p++)=0;
1386 #else
1387                 if (s->s3->tmp.new_compression == NULL)
1388                         *(p++)=0;
1389                 else
1390                         *(p++)=s->s3->tmp.new_compression->id;
1391 #endif
1392 #ifndef OPENSSL_NO_TLSEXT
1393                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1394                         {
1395                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1396                         return -1;
1397                         }
1398                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1399                         {
1400                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1401                         return -1;
1402                         }
1403 #endif
1404                 /* do the header */
1405                 l=(p-d);
1406                 d=buf;
1407                 *(d++)=SSL3_MT_SERVER_HELLO;
1408                 l2n3(l,d);
1409
1410                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1411                 /* number of bytes to write */
1412                 s->init_num=p-buf;
1413                 s->init_off=0;
1414                 }
1415
1416         /* SSL3_ST_SW_SRVR_HELLO_B */
1417         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1418         }
1419
1420 int ssl3_send_server_done(SSL *s)
1421         {
1422         unsigned char *p;
1423
1424         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1425                 {
1426                 p=(unsigned char *)s->init_buf->data;
1427
1428                 /* do the header */
1429                 *(p++)=SSL3_MT_SERVER_DONE;
1430                 *(p++)=0;
1431                 *(p++)=0;
1432                 *(p++)=0;
1433
1434                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1435                 /* number of bytes to write */
1436                 s->init_num=4;
1437                 s->init_off=0;
1438                 }
1439
1440         /* SSL3_ST_SW_SRVR_DONE_B */
1441         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1442         }
1443
1444 int ssl3_send_server_key_exchange(SSL *s)
1445         {
1446 #ifndef OPENSSL_NO_RSA
1447         unsigned char *q;
1448         int j,num;
1449         RSA *rsa;
1450         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1451         unsigned int u;
1452 #endif
1453 #ifndef OPENSSL_NO_DH
1454         DH *dh=NULL,*dhp;
1455 #endif
1456 #ifndef OPENSSL_NO_ECDH
1457         EC_KEY *ecdh=NULL, *ecdhp;
1458         unsigned char *encodedPoint = NULL;
1459         int encodedlen = 0;
1460         int curve_id = 0;
1461         BN_CTX *bn_ctx = NULL; 
1462 #endif
1463         EVP_PKEY *pkey;
1464         unsigned char *p,*d;
1465         int al,i;
1466         unsigned long type;
1467         int n;
1468         CERT *cert;
1469         BIGNUM *r[4];
1470         int nr[4],kn;
1471         BUF_MEM *buf;
1472         EVP_MD_CTX md_ctx;
1473
1474         EVP_MD_CTX_init(&md_ctx);
1475         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1476                 {
1477                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1478                 cert=s->cert;
1479
1480                 buf=s->init_buf;
1481
1482                 r[0]=r[1]=r[2]=r[3]=NULL;
1483                 n=0;
1484 #ifndef OPENSSL_NO_RSA
1485                 if (type & SSL_kRSA)
1486                         {
1487                         rsa=cert->rsa_tmp;
1488                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1489                                 {
1490                                 rsa=s->cert->rsa_tmp_cb(s,
1491                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1492                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1493                                 if(rsa == NULL)
1494                                 {
1495                                         al=SSL_AD_HANDSHAKE_FAILURE;
1496                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1497                                         goto f_err;
1498                                 }
1499                                 RSA_up_ref(rsa);
1500                                 cert->rsa_tmp=rsa;
1501                                 }
1502                         if (rsa == NULL)
1503                                 {
1504                                 al=SSL_AD_HANDSHAKE_FAILURE;
1505                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1506                                 goto f_err;
1507                                 }
1508                         r[0]=rsa->n;
1509                         r[1]=rsa->e;
1510                         s->s3->tmp.use_rsa_tmp=1;
1511                         }
1512                 else
1513 #endif
1514 #ifndef OPENSSL_NO_DH
1515                         if (type & SSL_kEDH)
1516                         {
1517                         dhp=cert->dh_tmp;
1518                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1519                                 dhp=s->cert->dh_tmp_cb(s,
1520                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1521                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1522                         if (dhp == NULL)
1523                                 {
1524                                 al=SSL_AD_HANDSHAKE_FAILURE;
1525                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1526                                 goto f_err;
1527                                 }
1528
1529                         if (s->s3->tmp.dh != NULL)
1530                                 {
1531                                 DH_free(dh);
1532                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1533                                 goto err;
1534                                 }
1535
1536                         if ((dh=DHparams_dup(dhp)) == NULL)
1537                                 {
1538                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1539                                 goto err;
1540                                 }
1541
1542                         s->s3->tmp.dh=dh;
1543                         if ((dhp->pub_key == NULL ||
1544                              dhp->priv_key == NULL ||
1545                              (s->options & SSL_OP_SINGLE_DH_USE)))
1546                                 {
1547                                 if(!DH_generate_key(dh))
1548                                     {
1549                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1550                                            ERR_R_DH_LIB);
1551                                     goto err;
1552                                     }
1553                                 }
1554                         else
1555                                 {
1556                                 dh->pub_key=BN_dup(dhp->pub_key);
1557                                 dh->priv_key=BN_dup(dhp->priv_key);
1558                                 if ((dh->pub_key == NULL) ||
1559                                         (dh->priv_key == NULL))
1560                                         {
1561                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1562                                         goto err;
1563                                         }
1564                                 }
1565                         r[0]=dh->p;
1566                         r[1]=dh->g;
1567                         r[2]=dh->pub_key;
1568                         }
1569                 else 
1570 #endif
1571 #ifndef OPENSSL_NO_ECDH
1572                         if (type & SSL_kEECDH)
1573                         {
1574                         const EC_GROUP *group;
1575
1576                         ecdhp=cert->ecdh_tmp;
1577                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1578                                 {
1579                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1580                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1581                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1582                                 }
1583                         if (ecdhp == NULL)
1584                                 {
1585                                 al=SSL_AD_HANDSHAKE_FAILURE;
1586                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1587                                 goto f_err;
1588                                 }
1589
1590                         if (s->s3->tmp.ecdh != NULL)
1591                                 {
1592                                 EC_KEY_free(s->s3->tmp.ecdh); 
1593                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1594                                 goto err;
1595                                 }
1596
1597                         /* Duplicate the ECDH structure. */
1598                         if (ecdhp == NULL)
1599                                 {
1600                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1601                                 goto err;
1602                                 }
1603                         if (!EC_KEY_up_ref(ecdhp))
1604                                 {
1605                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1606                                 goto err;
1607                                 }
1608                         ecdh = ecdhp;
1609
1610                         s->s3->tmp.ecdh=ecdh;
1611                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1612                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1613                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1614                                 {
1615                                 if(!EC_KEY_generate_key(ecdh))
1616                                     {
1617                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1618                                     goto err;
1619                                     }
1620                                 }
1621
1622                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1623                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1624                             (EC_KEY_get0_private_key(ecdh) == NULL))
1625                                 {
1626                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1627                                 goto err;
1628                                 }
1629
1630                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1631                             (EC_GROUP_get_degree(group) > 163)) 
1632                                 {
1633                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1634                                 goto err;
1635                                 }
1636
1637                         /* XXX: For now, we only support ephemeral ECDH
1638                          * keys over named (not generic) curves. For 
1639                          * supported named curves, curve_id is non-zero.
1640                          */
1641                         if ((curve_id = 
1642                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1643                             == 0)
1644                                 {
1645                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1646                                 goto err;
1647                                 }
1648
1649                         /* Encode the public key.
1650                          * First check the size of encoding and
1651                          * allocate memory accordingly.
1652                          */
1653                         encodedlen = EC_POINT_point2oct(group, 
1654                             EC_KEY_get0_public_key(ecdh),
1655                             POINT_CONVERSION_UNCOMPRESSED, 
1656                             NULL, 0, NULL);
1657
1658                         encodedPoint = (unsigned char *) 
1659                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1660                         bn_ctx = BN_CTX_new();
1661                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1662                                 {
1663                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1664                                 goto err;
1665                                 }
1666
1667
1668                         encodedlen = EC_POINT_point2oct(group, 
1669                             EC_KEY_get0_public_key(ecdh), 
1670                             POINT_CONVERSION_UNCOMPRESSED, 
1671                             encodedPoint, encodedlen, bn_ctx);
1672
1673                         if (encodedlen == 0) 
1674                                 {
1675                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1676                                 goto err;
1677                                 }
1678
1679                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1680
1681                         /* XXX: For now, we only support named (not 
1682                          * generic) curves in ECDH ephemeral key exchanges.
1683                          * In this situation, we need four additional bytes
1684                          * to encode the entire ServerECDHParams
1685                          * structure. 
1686                          */
1687                         n = 4 + encodedlen;
1688
1689                         /* We'll generate the serverKeyExchange message
1690                          * explicitly so we can set these to NULLs
1691                          */
1692                         r[0]=NULL;
1693                         r[1]=NULL;
1694                         r[2]=NULL;
1695                         r[3]=NULL;
1696                         }
1697                 else 
1698 #endif /* !OPENSSL_NO_ECDH */
1699 #ifndef OPENSSL_NO_PSK
1700                         if (type & SSL_kPSK)
1701                                 {
1702                                 /* reserve size for record length and PSK identity hint*/
1703                                 n+=2+strlen(s->ctx->psk_identity_hint);
1704                                 }
1705                         else
1706 #endif /* !OPENSSL_NO_PSK */
1707                         {
1708                         al=SSL_AD_HANDSHAKE_FAILURE;
1709                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1710                         goto f_err;
1711                         }
1712                 for (i=0; r[i] != NULL; i++)
1713                         {
1714                         nr[i]=BN_num_bytes(r[i]);
1715                         n+=2+nr[i];
1716                         }
1717
1718                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1719                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1720                         {
1721                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1722                                 == NULL)
1723                                 {
1724                                 al=SSL_AD_DECODE_ERROR;
1725                                 goto f_err;
1726                                 }
1727                         kn=EVP_PKEY_size(pkey);
1728                         }
1729                 else
1730                         {
1731                         pkey=NULL;
1732                         kn=0;
1733                         }
1734
1735                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1736                         {
1737                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1738                         goto err;
1739                         }
1740                 d=(unsigned char *)s->init_buf->data;
1741                 p= &(d[4]);
1742
1743                 for (i=0; r[i] != NULL; i++)
1744                         {
1745                         s2n(nr[i],p);
1746                         BN_bn2bin(r[i],p);
1747                         p+=nr[i];
1748                         }
1749
1750 #ifndef OPENSSL_NO_ECDH
1751                 if (type & SSL_kEECDH) 
1752                         {
1753                         /* XXX: For now, we only support named (not generic) curves.
1754                          * In this situation, the serverKeyExchange message has:
1755                          * [1 byte CurveType], [2 byte CurveName]
1756                          * [1 byte length of encoded point], followed by
1757                          * the actual encoded point itself
1758                          */
1759                         *p = NAMED_CURVE_TYPE;
1760                         p += 1;
1761                         *p = 0;
1762                         p += 1;
1763                         *p = curve_id;
1764                         p += 1;
1765                         *p = encodedlen;
1766                         p += 1;
1767                         memcpy((unsigned char*)p, 
1768                             (unsigned char *)encodedPoint, 
1769                             encodedlen);
1770                         OPENSSL_free(encodedPoint);
1771                         p += encodedlen;
1772                         }
1773 #endif
1774
1775 #ifndef OPENSSL_NO_PSK
1776                 if (type & SSL_kPSK)
1777                         {
1778                         /* copy PSK identity hint */
1779                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1780                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1781                         p+=strlen(s->ctx->psk_identity_hint);
1782                         }
1783 #endif
1784
1785                 /* not anonymous */
1786                 if (pkey != NULL)
1787                         {
1788                         /* n is the length of the params, they start at &(d[4])
1789                          * and p points to the space at the end. */
1790 #ifndef OPENSSL_NO_RSA
1791                         if (pkey->type == EVP_PKEY_RSA)
1792                                 {
1793                                 q=md_buf;
1794                                 j=0;
1795                                 for (num=2; num > 0; num--)
1796                                         {
1797                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1798                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1799                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1800                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1801                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1802                                         EVP_DigestFinal_ex(&md_ctx,q,
1803                                                 (unsigned int *)&i);
1804                                         q+=i;
1805                                         j+=i;
1806                                         }
1807                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1808                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1809                                         {
1810                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1811                                         goto err;
1812                                         }
1813                                 s2n(u,p);
1814                                 n+=u+2;
1815                                 }
1816                         else
1817 #endif
1818 #if !defined(OPENSSL_NO_DSA)
1819                                 if (pkey->type == EVP_PKEY_DSA)
1820                                 {
1821                                 /* lets do DSS */
1822                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1823                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1824                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1825                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1826                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1827                                         (unsigned int *)&i,pkey))
1828                                         {
1829                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1830                                         goto err;
1831                                         }
1832                                 s2n(i,p);
1833                                 n+=i+2;
1834                                 }
1835                         else
1836 #endif
1837 #if !defined(OPENSSL_NO_ECDSA)
1838                                 if (pkey->type == EVP_PKEY_EC)
1839                                 {
1840                                 /* let's do ECDSA */
1841                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1842                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1843                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1844                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1845                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1846                                         (unsigned int *)&i,pkey))
1847                                         {
1848                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1849                                         goto err;
1850                                         }
1851                                 s2n(i,p);
1852                                 n+=i+2;
1853                                 }
1854                         else
1855 #endif
1856                                 {
1857                                 /* Is this error check actually needed? */
1858                                 al=SSL_AD_HANDSHAKE_FAILURE;
1859                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1860                                 goto f_err;
1861                                 }
1862                         }
1863
1864                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1865                 l2n3(n,d);
1866
1867                 /* we should now have things packed up, so lets send
1868                  * it off */
1869                 s->init_num=n+4;
1870                 s->init_off=0;
1871                 }
1872
1873         s->state = SSL3_ST_SW_KEY_EXCH_B;
1874         EVP_MD_CTX_cleanup(&md_ctx);
1875         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1876 f_err:
1877         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1878 err:
1879 #ifndef OPENSSL_NO_ECDH
1880         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1881         BN_CTX_free(bn_ctx);
1882 #endif
1883         EVP_MD_CTX_cleanup(&md_ctx);
1884         return(-1);
1885         }
1886
1887 int ssl3_send_certificate_request(SSL *s)
1888         {
1889         unsigned char *p,*d;
1890         int i,j,nl,off,n;
1891         STACK_OF(X509_NAME) *sk=NULL;
1892         X509_NAME *name;
1893         BUF_MEM *buf;
1894
1895         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1896                 {
1897                 buf=s->init_buf;
1898
1899                 d=p=(unsigned char *)&(buf->data[4]);
1900
1901                 /* get the list of acceptable cert types */
1902                 p++;
1903                 n=ssl3_get_req_cert_type(s,p);
1904                 d[0]=n;
1905                 p+=n;
1906                 n++;
1907
1908                 off=n;
1909                 p+=2;
1910                 n+=2;
1911
1912                 sk=SSL_get_client_CA_list(s);
1913                 nl=0;
1914                 if (sk != NULL)
1915                         {
1916                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1917                                 {
1918                                 name=sk_X509_NAME_value(sk,i);
1919                                 j=i2d_X509_NAME(name,NULL);
1920                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1921                                         {
1922                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1923                                         goto err;
1924                                         }
1925                                 p=(unsigned char *)&(buf->data[4+n]);
1926                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1927                                         {
1928                                         s2n(j,p);
1929                                         i2d_X509_NAME(name,&p);
1930                                         n+=2+j;
1931                                         nl+=2+j;
1932                                         }
1933                                 else
1934                                         {
1935                                         d=p;
1936                                         i2d_X509_NAME(name,&p);
1937                                         j-=2; s2n(j,d); j+=2;
1938                                         n+=j;
1939                                         nl+=j;
1940                                         }
1941                                 }
1942                         }
1943                 /* else no CA names */
1944                 p=(unsigned char *)&(buf->data[4+off]);
1945                 s2n(nl,p);
1946
1947                 d=(unsigned char *)buf->data;
1948                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1949                 l2n3(n,d);
1950
1951                 /* we should now have things packed up, so lets send
1952                  * it off */
1953
1954                 s->init_num=n+4;
1955                 s->init_off=0;
1956 #ifdef NETSCAPE_HANG_BUG
1957                 p=(unsigned char *)s->init_buf->data + s->init_num;
1958
1959                 /* do the header */
1960                 *(p++)=SSL3_MT_SERVER_DONE;
1961                 *(p++)=0;
1962                 *(p++)=0;
1963                 *(p++)=0;
1964                 s->init_num += 4;
1965 #endif
1966
1967                 s->state = SSL3_ST_SW_CERT_REQ_B;
1968                 }
1969
1970         /* SSL3_ST_SW_CERT_REQ_B */
1971         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1972 err:
1973         return(-1);
1974         }
1975
1976 int ssl3_get_client_key_exchange(SSL *s)
1977         {
1978         int i,al,ok;
1979         long n;
1980         unsigned long alg_k;
1981         unsigned char *p;
1982 #ifndef OPENSSL_NO_RSA
1983         RSA *rsa=NULL;
1984         EVP_PKEY *pkey=NULL;
1985 #endif
1986 #ifndef OPENSSL_NO_DH
1987         BIGNUM *pub=NULL;
1988         DH *dh_srvr;
1989 #endif
1990 #ifndef OPENSSL_NO_KRB5
1991         KSSL_ERR kssl_err;
1992 #endif /* OPENSSL_NO_KRB5 */
1993
1994 #ifndef OPENSSL_NO_ECDH
1995         EC_KEY *srvr_ecdh = NULL;
1996         EVP_PKEY *clnt_pub_pkey = NULL;
1997         EC_POINT *clnt_ecpoint = NULL;
1998         BN_CTX *bn_ctx = NULL; 
1999 #endif
2000
2001         n=s->method->ssl_get_message(s,
2002                 SSL3_ST_SR_KEY_EXCH_A,
2003                 SSL3_ST_SR_KEY_EXCH_B,
2004                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2005                 2048, /* ??? */
2006                 &ok);
2007
2008         if (!ok) return((int)n);
2009         p=(unsigned char *)s->init_msg;
2010
2011         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2012
2013 #ifndef OPENSSL_NO_RSA
2014         if (alg_k & SSL_kRSA)
2015                 {
2016                 /* FIX THIS UP EAY EAY EAY EAY */
2017                 if (s->s3->tmp.use_rsa_tmp)
2018                         {
2019                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2020                                 rsa=s->cert->rsa_tmp;
2021                         /* Don't do a callback because rsa_tmp should
2022                          * be sent already */
2023                         if (rsa == NULL)
2024                                 {
2025                                 al=SSL_AD_HANDSHAKE_FAILURE;
2026                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2027                                 goto f_err;
2028
2029                                 }
2030                         }
2031                 else
2032                         {
2033                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2034                         if (    (pkey == NULL) ||
2035                                 (pkey->type != EVP_PKEY_RSA) ||
2036                                 (pkey->pkey.rsa == NULL))
2037                                 {
2038                                 al=SSL_AD_HANDSHAKE_FAILURE;
2039                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2040                                 goto f_err;
2041                                 }
2042                         rsa=pkey->pkey.rsa;
2043                         }
2044
2045                 /* TLS and [incidentally] DTLS{0xFEFF} */
2046                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2047                         {
2048                         n2s(p,i);
2049                         if (n != i+2)
2050                                 {
2051                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2052                                         {
2053                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2054                                         goto err;
2055                                         }
2056                                 else
2057                                         p-=2;
2058                                 }
2059                         else
2060                                 n=i;
2061                         }
2062
2063                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2064
2065                 al = -1;
2066                 
2067                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2068                         {
2069                         al=SSL_AD_DECODE_ERROR;
2070                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2071                         }
2072
2073                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2074                         {
2075                         /* The premaster secret must contain the same version number as the
2076                          * ClientHello to detect version rollback attacks (strangely, the
2077                          * protocol does not offer such protection for DH ciphersuites).
2078                          * However, buggy clients exist that send the negotiated protocol
2079                          * version instead if the server does not support the requested
2080                          * protocol version.
2081                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2082                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2083                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2084                                 {
2085                                 al=SSL_AD_DECODE_ERROR;
2086                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2087
2088                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2089                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2090                                  * number check as a "bad version oracle" -- an alert would
2091                                  * reveal that the plaintext corresponding to some ciphertext
2092                                  * made up by the adversary is properly formatted except
2093                                  * that the version number is wrong.  To avoid such attacks,
2094                                  * we should treat this just like any other decryption error. */
2095                                 }
2096                         }
2097
2098                 if (al != -1)
2099                         {
2100                         /* Some decryption failure -- use random value instead as countermeasure
2101                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2102                          * (see RFC 2246, section 7.4.7.1). */
2103                         ERR_clear_error();
2104                         i = SSL_MAX_MASTER_KEY_LENGTH;
2105                         p[0] = s->client_version >> 8;
2106                         p[1] = s->client_version & 0xff;
2107                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2108                                 goto err;
2109                         }
2110         
2111                 s->session->master_key_length=
2112                         s->method->ssl3_enc->generate_master_secret(s,
2113                                 s->session->master_key,
2114                                 p,i);
2115                 OPENSSL_cleanse(p,i);
2116                 }
2117         else
2118 #endif
2119 #ifndef OPENSSL_NO_DH
2120                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2121                 {
2122                 n2s(p,i);
2123                 if (n != i+2)
2124                         {
2125                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2126                                 {
2127                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2128                                 goto err;
2129                                 }
2130                         else
2131                                 {
2132                                 p-=2;
2133                                 i=(int)n;
2134                                 }
2135                         }
2136
2137                 if (n == 0L) /* the parameters are in the cert */
2138                         {
2139                         al=SSL_AD_HANDSHAKE_FAILURE;
2140                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2141                         goto f_err;
2142                         }
2143                 else
2144                         {
2145                         if (s->s3->tmp.dh == NULL)
2146                                 {
2147                                 al=SSL_AD_HANDSHAKE_FAILURE;
2148                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2149                                 goto f_err;
2150                                 }
2151                         else
2152                                 dh_srvr=s->s3->tmp.dh;
2153                         }
2154
2155                 pub=BN_bin2bn(p,i,NULL);
2156                 if (pub == NULL)
2157                         {
2158                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2159                         goto err;
2160                         }
2161
2162                 i=DH_compute_key(p,pub,dh_srvr);
2163
2164                 if (i <= 0)
2165                         {
2166                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2167                         goto err;
2168                         }
2169
2170                 DH_free(s->s3->tmp.dh);
2171                 s->s3->tmp.dh=NULL;
2172
2173                 BN_clear_free(pub);
2174                 pub=NULL;
2175                 s->session->master_key_length=
2176                         s->method->ssl3_enc->generate_master_secret(s,
2177                                 s->session->master_key,p,i);
2178                 OPENSSL_cleanse(p,i);
2179                 }
2180         else
2181 #endif
2182 #ifndef OPENSSL_NO_KRB5
2183         if (alg_k & SSL_kKRB5)
2184                 {
2185                 krb5_error_code         krb5rc;
2186                 krb5_data               enc_ticket;
2187                 krb5_data               authenticator;
2188                 krb5_data               enc_pms;
2189                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2190                 EVP_CIPHER_CTX          ciph_ctx;
2191                 const EVP_CIPHER        *enc = NULL;
2192                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2193                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2194                                                + EVP_MAX_BLOCK_LENGTH];
2195                 int                  padl, outl;
2196                 krb5_timestamp          authtime = 0;
2197                 krb5_ticket_times       ttimes;
2198
2199                 EVP_CIPHER_CTX_init(&ciph_ctx);
2200
2201                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2202
2203                 n2s(p,i);
2204                 enc_ticket.length = i;
2205
2206                 if (n < (long)(enc_ticket.length + 6))
2207                         {
2208                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2209                                 SSL_R_DATA_LENGTH_TOO_LONG);
2210                         goto err;
2211                         }
2212
2213                 enc_ticket.data = (char *)p;
2214                 p+=enc_ticket.length;
2215
2216                 n2s(p,i);
2217                 authenticator.length = i;
2218
2219                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2220                         {
2221                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2222                                 SSL_R_DATA_LENGTH_TOO_LONG);
2223                         goto err;
2224                         }
2225
2226                 authenticator.data = (char *)p;
2227                 p+=authenticator.length;
2228
2229                 n2s(p,i);
2230                 enc_pms.length = i;
2231                 enc_pms.data = (char *)p;
2232                 p+=enc_pms.length;
2233
2234                 /* Note that the length is checked again below,
2235                 ** after decryption
2236                 */
2237                 if(enc_pms.length > sizeof pms)
2238                         {
2239                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2240                                SSL_R_DATA_LENGTH_TOO_LONG);
2241                         goto err;
2242                         }
2243
2244                 if (n != (long)(enc_ticket.length + authenticator.length +
2245                                                 enc_pms.length + 6))
2246                         {
2247                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2248                                 SSL_R_DATA_LENGTH_TOO_LONG);
2249                         goto err;
2250                         }
2251
2252                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2253                                         &kssl_err)) != 0)
2254                         {
2255 #ifdef KSSL_DEBUG
2256                         printf("kssl_sget_tkt rtn %d [%d]\n",
2257                                 krb5rc, kssl_err.reason);
2258                         if (kssl_err.text)
2259                                 printf("kssl_err text= %s\n", kssl_err.text);
2260 #endif  /* KSSL_DEBUG */
2261                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2262                                 kssl_err.reason);
2263                         goto err;
2264                         }
2265
2266                 /*  Note: no authenticator is not considered an error,
2267                 **  but will return authtime == 0.
2268                 */
2269                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2270                                         &authtime, &kssl_err)) != 0)
2271                         {
2272 #ifdef KSSL_DEBUG
2273                         printf("kssl_check_authent rtn %d [%d]\n",
2274                                 krb5rc, kssl_err.reason);
2275                         if (kssl_err.text)
2276                                 printf("kssl_err text= %s\n", kssl_err.text);
2277 #endif  /* KSSL_DEBUG */
2278                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2279                                 kssl_err.reason);
2280                         goto err;
2281                         }
2282
2283                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2284                         {
2285                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2286                         goto err;
2287                         }
2288
2289 #ifdef KSSL_DEBUG
2290                 kssl_ctx_show(kssl_ctx);
2291 #endif  /* KSSL_DEBUG */
2292
2293                 enc = kssl_map_enc(kssl_ctx->enctype);
2294                 if (enc == NULL)
2295                     goto err;
2296
2297                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2298
2299                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2300                         {
2301                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2302                                 SSL_R_DECRYPTION_FAILED);
2303                         goto err;
2304                         }
2305                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2306                                         (unsigned char *)enc_pms.data, enc_pms.length))
2307                         {
2308                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2309                                 SSL_R_DECRYPTION_FAILED);
2310                         goto err;
2311                         }
2312                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2313                         {
2314                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2315                                 SSL_R_DATA_LENGTH_TOO_LONG);
2316                         goto err;
2317                         }
2318                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2319                         {
2320                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2321                                 SSL_R_DECRYPTION_FAILED);
2322                         goto err;
2323                         }
2324                 outl += padl;
2325                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2326                         {
2327                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2328                                 SSL_R_DATA_LENGTH_TOO_LONG);
2329                         goto err;
2330                         }
2331                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2332                     {
2333                     /* The premaster secret must contain the same version number as the
2334                      * ClientHello to detect version rollback attacks (strangely, the
2335                      * protocol does not offer such protection for DH ciphersuites).
2336                      * However, buggy clients exist that send random bytes instead of
2337                      * the protocol version.
2338                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2339                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2340                      */
2341                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2342                         {
2343                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2344                                SSL_AD_DECODE_ERROR);
2345                         goto err;
2346                         }
2347                     }
2348
2349                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2350
2351                 s->session->master_key_length=
2352                         s->method->ssl3_enc->generate_master_secret(s,
2353                                 s->session->master_key, pms, outl);
2354
2355                 if (kssl_ctx->client_princ)
2356                         {
2357                         size_t len = strlen(kssl_ctx->client_princ);
2358                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2359                                 {
2360                                 s->session->krb5_client_princ_len = len;
2361                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2362                                 }
2363                         }
2364
2365
2366                 /*  Was doing kssl_ctx_free() here,
2367                 **  but it caused problems for apache.
2368                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2369                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2370                 */
2371                 }
2372         else
2373 #endif  /* OPENSSL_NO_KRB5 */
2374
2375 #ifndef OPENSSL_NO_ECDH
2376                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2377                 {
2378                 int ret = 1;
2379                 int field_size = 0;
2380                 const EC_KEY   *tkey;
2381                 const EC_GROUP *group;
2382                 const BIGNUM *priv_key;
2383
2384                 /* initialize structures for server's ECDH key pair */
2385                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2386                         {
2387                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2388                             ERR_R_MALLOC_FAILURE);
2389                         goto err;
2390                         }
2391
2392                 /* Let's get server private key and group information */
2393                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2394                         { 
2395                         /* use the certificate */
2396                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2397                         }
2398                 else
2399                         {
2400                         /* use the ephermeral values we saved when
2401                          * generating the ServerKeyExchange msg.
2402                          */
2403                         tkey = s->s3->tmp.ecdh;
2404                         }
2405
2406                 group    = EC_KEY_get0_group(tkey);
2407                 priv_key = EC_KEY_get0_private_key(tkey);
2408
2409                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2410                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2411                         {
2412                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2413                                ERR_R_EC_LIB);
2414                         goto err;
2415                         }
2416
2417                 /* Let's get client's public key */
2418                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2419                         {
2420                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2421                             ERR_R_MALLOC_FAILURE);
2422                         goto err;
2423                         }
2424
2425                 if (n == 0L) 
2426                         {
2427                         /* Client Publickey was in Client Certificate */
2428
2429                          if (alg_k & SSL_kEECDH)
2430                                  {
2431                                  al=SSL_AD_HANDSHAKE_FAILURE;
2432                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2433                                  goto f_err;
2434                                  }
2435                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2436                             == NULL) || 
2437                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2438                                 {
2439                                 /* XXX: For now, we do not support client
2440                                  * authentication using ECDH certificates
2441                                  * so this branch (n == 0L) of the code is
2442                                  * never executed. When that support is
2443                                  * added, we ought to ensure the key 
2444                                  * received in the certificate is 
2445                                  * authorized for key agreement.
2446                                  * ECDH_compute_key implicitly checks that
2447                                  * the two ECDH shares are for the same
2448                                  * group.
2449                                  */
2450                                 al=SSL_AD_HANDSHAKE_FAILURE;
2451                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2452                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2453                                 goto f_err;
2454                                 }
2455
2456                         if (EC_POINT_copy(clnt_ecpoint,
2457                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2458                                 {
2459                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2460                                         ERR_R_EC_LIB);
2461                                 goto err;
2462                                 }
2463                         ret = 2; /* Skip certificate verify processing */
2464                         }
2465                 else
2466                         {
2467                         /* Get client's public key from encoded point
2468                          * in the ClientKeyExchange message.
2469                          */
2470                         if ((bn_ctx = BN_CTX_new()) == NULL)
2471                                 {
2472                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2473                                     ERR_R_MALLOC_FAILURE);
2474                                 goto err;
2475                                 }
2476
2477                         /* Get encoded point length */
2478                         i = *p; 
2479                         p += 1;
2480                         if (EC_POINT_oct2point(group, 
2481                             clnt_ecpoint, p, i, bn_ctx) == 0)
2482                                 {
2483                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2484                                     ERR_R_EC_LIB);
2485                                 goto err;
2486                                 }
2487                         /* p is pointing to somewhere in the buffer
2488                          * currently, so set it to the start 
2489                          */ 
2490                         p=(unsigned char *)s->init_buf->data;
2491                         }
2492
2493                 /* Compute the shared pre-master secret */
2494                 field_size = EC_GROUP_get_degree(group);
2495                 if (field_size <= 0)
2496                         {
2497                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2498                                ERR_R_ECDH_LIB);
2499                         goto err;
2500                         }
2501                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2502                 if (i <= 0)
2503                         {
2504                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2505                             ERR_R_ECDH_LIB);
2506                         goto err;
2507                         }
2508
2509                 EVP_PKEY_free(clnt_pub_pkey);
2510                 EC_POINT_free(clnt_ecpoint);
2511                 EC_KEY_free(srvr_ecdh);
2512                 BN_CTX_free(bn_ctx);
2513                 EC_KEY_free(s->s3->tmp.ecdh);
2514                 s->s3->tmp.ecdh = NULL; 
2515
2516                 /* Compute the master secret */
2517                 s->session->master_key_length = s->method->ssl3_enc-> \
2518                     generate_master_secret(s, s->session->master_key, p, i);
2519                 
2520                 OPENSSL_cleanse(p, i);
2521                 return (ret);
2522                 }
2523         else
2524 #endif
2525 #ifndef OPENSSL_NO_PSK
2526                 if (alg_k & SSL_kPSK)
2527                         {
2528                         unsigned char *t = NULL;
2529                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2530                         unsigned int pre_ms_len = 0, psk_len = 0;
2531                         int psk_err = 1;
2532                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2533
2534                         al=SSL_AD_HANDSHAKE_FAILURE;
2535
2536                         n2s(p,i);
2537                         if (n != i+2)
2538                                 {
2539                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2540                                         SSL_R_LENGTH_MISMATCH);
2541                                 goto psk_err;
2542                                 }
2543                         if (i > PSK_MAX_IDENTITY_LEN)
2544                                 {
2545                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2546                                         SSL_R_DATA_LENGTH_TOO_LONG);
2547                                 goto psk_err;
2548                                 }
2549                         if (s->psk_server_callback == NULL)
2550                                 {
2551                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2552                                        SSL_R_PSK_NO_SERVER_CB);
2553                                 goto psk_err;
2554                                 }
2555
2556                         /* Create guaranteed NULL-terminated identity
2557                          * string for the callback */
2558                         memcpy(tmp_id, p, i);
2559                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2560                         psk_len = s->psk_server_callback(s, tmp_id,
2561                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2562                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2563
2564                         if (psk_len > PSK_MAX_PSK_LEN)
2565                                 {
2566                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2567                                         ERR_R_INTERNAL_ERROR);
2568                                 goto psk_err;
2569                                 }
2570                         else if (psk_len == 0)
2571                                 {
2572                                 /* PSK related to the given identity not found */
2573                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2574                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2575                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2576                                 goto psk_err;
2577                                 }
2578
2579                         /* create PSK pre_master_secret */
2580                         pre_ms_len=2+psk_len+2+psk_len;
2581                         t = psk_or_pre_ms;
2582                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2583                         s2n(psk_len, t);
2584                         memset(t, 0, psk_len);
2585                         t+=psk_len;
2586                         s2n(psk_len, t);
2587
2588                         if (s->session->psk_identity != NULL)
2589                                 OPENSSL_free(s->session->psk_identity);
2590                         s->session->psk_identity = BUF_strdup((char *)p);
2591                         if (s->session->psk_identity == NULL)
2592                                 {
2593                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2594                                         ERR_R_MALLOC_FAILURE);
2595                                 goto psk_err;
2596                                 }
2597
2598                         if (s->session->psk_identity_hint != NULL)
2599                                 OPENSSL_free(s->session->psk_identity_hint);
2600                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2601                         if (s->ctx->psk_identity_hint != NULL &&
2602                                 s->session->psk_identity_hint == NULL)
2603                                 {
2604                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2605                                         ERR_R_MALLOC_FAILURE);
2606                                 goto psk_err;
2607                                 }
2608
2609                         s->session->master_key_length=
2610                                 s->method->ssl3_enc->generate_master_secret(s,
2611                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2612                         psk_err = 0;
2613                 psk_err:
2614                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2615                         if (psk_err != 0)
2616                                 goto f_err;
2617                         }
2618                 else
2619 #endif
2620                 if (alg_k & SSL_kGOST) 
2621                         {
2622                         int ret = 0;
2623                         EVP_PKEY_CTX *pkey_ctx;
2624                         EVP_PKEY *client_pub_pkey = NULL;
2625                         unsigned char premaster_secret[32], *start;
2626                         size_t outlen=32, inlen;                        
2627
2628                         /* Get our certificate private key*/
2629                         pkey_ctx = EVP_PKEY_CTX_new(s->cert->key->privatekey,NULL);     
2630                         EVP_PKEY_decrypt_init(pkey_ctx);
2631                         /* If client certificate is present and is of the same type, maybe
2632                          * use it for key exchange.  Don't mind errors from
2633                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2634                          * a client certificate for authorization only. */
2635                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2636                         if (client_pub_pkey)
2637                                 {
2638                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2639                                         ERR_clear_error();
2640                                 }
2641                         /* Decrypt session key */
2642                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2643                                 {
2644                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2645                                 goto gerr;
2646                                 }
2647                         if (p[1] == 0x81)
2648                                 {
2649                                 start = p+3;
2650                                 inlen = p[2];
2651                                 }
2652                         else if (p[1] < 0x80)
2653                                 {
2654                                 start = p+2;
2655                                 inlen = p[1];
2656                                 }
2657                         else
2658                                 {
2659                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2660                                 goto gerr;
2661                                 }
2662                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2663
2664                                 {
2665                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2666                                 goto gerr;
2667                                 }
2668                         /* Generate master secret */
2669                         s->session->master_key_length=
2670                                 s->method->ssl3_enc->generate_master_secret(s,
2671                                         s->session->master_key,premaster_secret,32);
2672                         /* Check if pubkey from client certificate was used */
2673                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2674                                 ret = 2;
2675                         else
2676                                 ret = 1;
2677                 gerr:
2678                         EVP_PKEY_free(client_pub_pkey);
2679                         EVP_PKEY_CTX_free(pkey_ctx);
2680                         if (ret)
2681                                 return ret;
2682                         else
2683                                 goto err;
2684                         }
2685                 else
2686                 {
2687                 al=SSL_AD_HANDSHAKE_FAILURE;
2688                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2689                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2690                 goto f_err;
2691                 }
2692
2693         return(1);
2694 f_err:
2695         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2696 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2697 err:
2698 #endif
2699 #ifndef OPENSSL_NO_ECDH
2700         EVP_PKEY_free(clnt_pub_pkey);
2701         EC_POINT_free(clnt_ecpoint);
2702         if (srvr_ecdh != NULL) 
2703                 EC_KEY_free(srvr_ecdh);
2704         BN_CTX_free(bn_ctx);
2705 #endif
2706         return(-1);
2707         }
2708
2709 int ssl3_get_cert_verify(SSL *s)
2710         {
2711         EVP_PKEY *pkey=NULL;
2712         unsigned char *p;
2713         int al,ok,ret=0;
2714         long n;
2715         int type=0,i,j;
2716         X509 *peer;
2717
2718         n=s->method->ssl_get_message(s,
2719                 SSL3_ST_SR_CERT_VRFY_A,
2720                 SSL3_ST_SR_CERT_VRFY_B,
2721                 -1,
2722                 514, /* 514? */
2723                 &ok);
2724
2725         if (!ok) return((int)n);
2726
2727         if (s->session->peer != NULL)
2728                 {
2729                 peer=s->session->peer;
2730                 pkey=X509_get_pubkey(peer);
2731                 type=X509_certificate_type(peer,pkey);
2732                 }
2733         else
2734                 {
2735                 peer=NULL;
2736                 pkey=NULL;
2737                 }
2738
2739         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2740                 {
2741                 s->s3->tmp.reuse_message=1;
2742                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2743                         {
2744                         al=SSL_AD_UNEXPECTED_MESSAGE;
2745                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2746                         goto f_err;
2747                         }
2748                 ret=1;
2749                 goto end;
2750                 }
2751
2752         if (peer == NULL)
2753                 {
2754                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2755                 al=SSL_AD_UNEXPECTED_MESSAGE;
2756                 goto f_err;
2757                 }
2758
2759         if (!(type & EVP_PKT_SIGN))
2760                 {
2761                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2762                 al=SSL_AD_ILLEGAL_PARAMETER;
2763                 goto f_err;
2764                 }
2765
2766         if (s->s3->change_cipher_spec)
2767                 {
2768                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2769                 al=SSL_AD_UNEXPECTED_MESSAGE;
2770                 goto f_err;
2771                 }
2772
2773         /* we now have a signature that we need to verify */
2774         p=(unsigned char *)s->init_msg;
2775         /* Check for broken implementations of GOST ciphersuites */
2776         /* If key is GOST and n is exactly 64, it is bare
2777          * signature without length field */
2778         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2779                 pkey->type == NID_id_GostR3410_2001) )
2780                 {
2781                 i=64;
2782                 } 
2783         else 
2784                 {       
2785                 n2s(p,i);
2786                 n-=2;
2787                 if (i > n)
2788                         {
2789                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2790                         al=SSL_AD_DECODE_ERROR;
2791                         goto f_err;
2792                         }
2793         }
2794         j=EVP_PKEY_size(pkey);
2795         if ((i > j) || (n > j) || (n <= 0))
2796                 {
2797                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2798                 al=SSL_AD_DECODE_ERROR;
2799                 goto f_err;
2800                 }
2801
2802 #ifndef OPENSSL_NO_RSA 
2803         if (pkey->type == EVP_PKEY_RSA)
2804                 {
2805                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2806                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
2807                                                         pkey->pkey.rsa);
2808                 if (i < 0)
2809                         {
2810                         al=SSL_AD_DECRYPT_ERROR;
2811                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2812                         goto f_err;
2813                         }
2814                 if (i == 0)
2815                         {
2816                         al=SSL_AD_DECRYPT_ERROR;
2817                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2818                         goto f_err;
2819                         }
2820                 }
2821         else
2822 #endif
2823 #ifndef OPENSSL_NO_DSA
2824                 if (pkey->type == EVP_PKEY_DSA)
2825                 {
2826                 j=DSA_verify(pkey->save_type,
2827                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2828                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2829                 if (j <= 0)
2830                         {
2831                         /* bad signature */
2832                         al=SSL_AD_DECRYPT_ERROR;
2833                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2834                         goto f_err;
2835                         }
2836                 }
2837         else
2838 #endif
2839 #ifndef OPENSSL_NO_ECDSA
2840                 if (pkey->type == EVP_PKEY_EC)
2841                 {
2842                 j=ECDSA_verify(pkey->save_type,
2843                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2844                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2845                 if (j <= 0)
2846                         {
2847                         /* bad signature */
2848                         al=SSL_AD_DECRYPT_ERROR;
2849                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2850                             SSL_R_BAD_ECDSA_SIGNATURE);
2851                         goto f_err;
2852                         }
2853                 }
2854         else
2855 #endif
2856         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2857                 {   unsigned char signature[64];
2858                         int idx;
2859                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2860                         EVP_PKEY_verify_init(pctx);
2861                         if (i!=64) {
2862                                 fprintf(stderr,"GOST signature length is %d",i);
2863                         }       
2864                         for (idx=0;idx<64;idx++) {
2865                                 signature[63-idx]=p[idx];
2866                         }       
2867                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2868                         EVP_PKEY_CTX_free(pctx);
2869                         if (j<=0) 
2870                                 {
2871                                 al=SSL_AD_DECRYPT_ERROR;
2872                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2873                                         SSL_R_BAD_ECDSA_SIGNATURE);
2874                                 goto f_err;
2875                                 }       
2876                 }
2877         else    
2878                 {
2879                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2880                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2881                 goto f_err;
2882                 }
2883
2884
2885         ret=1;
2886         if (0)
2887                 {
2888 f_err:
2889                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2890                 }
2891 end:
2892         EVP_PKEY_free(pkey);
2893         return(ret);
2894         }
2895
2896 int ssl3_get_client_certificate(SSL *s)
2897         {
2898         int i,ok,al,ret= -1;
2899         X509 *x=NULL;
2900         unsigned long l,nc,llen,n;
2901         const unsigned char *p,*q;
2902         unsigned char *d;
2903         STACK_OF(X509) *sk=NULL;
2904
2905         n=s->method->ssl_get_message(s,
2906                 SSL3_ST_SR_CERT_A,
2907                 SSL3_ST_SR_CERT_B,
2908                 -1,
2909                 s->max_cert_list,
2910                 &ok);
2911
2912         if (!ok) return((int)n);
2913
2914         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2915                 {
2916                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2917                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2918                         {
2919                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2920                         al=SSL_AD_HANDSHAKE_FAILURE;
2921                         goto f_err;
2922                         }
2923                 /* If tls asked for a client cert, the client must return a 0 list */
2924                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2925                         {
2926                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2927                         al=SSL_AD_UNEXPECTED_MESSAGE;
2928                         goto f_err;
2929                         }
2930                 s->s3->tmp.reuse_message=1;
2931                 return(1);
2932                 }
2933
2934         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2935                 {
2936                 al=SSL_AD_UNEXPECTED_MESSAGE;
2937                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2938                 goto f_err;
2939                 }
2940         p=d=(unsigned char *)s->init_msg;
2941
2942         if ((sk=sk_X509_new_null()) == NULL)
2943                 {
2944                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2945                 goto err;
2946                 }
2947
2948         n2l3(p,llen);
2949         if (llen+3 != n)
2950                 {
2951                 al=SSL_AD_DECODE_ERROR;
2952                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2953                 goto f_err;
2954                 }
2955         for (nc=0; nc<llen; )
2956                 {
2957                 n2l3(p,l);
2958                 if ((l+nc+3) > llen)
2959                         {
2960                         al=SSL_AD_DECODE_ERROR;
2961                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2962                         goto f_err;
2963                         }
2964
2965                 q=p;
2966                 x=d2i_X509(NULL,&p,l);
2967                 if (x == NULL)
2968                         {
2969                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2970                         goto err;
2971                         }
2972                 if (p != (q+l))