8c8c1486ee2e4588d3a4655b4fe5738ca51ba92e
[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         long num1;
193         int ret= -1;
194         int new_state,state,skip=0;
195
196         RAND_add(&Time,sizeof(Time),0);
197         ERR_clear_error();
198         clear_sys_error();
199
200         if (s->info_callback != NULL)
201                 cb=s->info_callback;
202         else if (s->ctx->info_callback != NULL)
203                 cb=s->ctx->info_callback;
204
205         /* init things to blank */
206         s->in_handshake++;
207         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
208
209         if (s->cert == NULL)
210                 {
211                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
212                 return(-1);
213                 }
214
215         for (;;)
216                 {
217                 state=s->state;
218
219                 switch (s->state)
220                         {
221                 case SSL_ST_RENEGOTIATE:
222                         s->new_session=1;
223                         /* s->state=SSL_ST_ACCEPT; */
224
225                 case SSL_ST_BEFORE:
226                 case SSL_ST_ACCEPT:
227                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
228                 case SSL_ST_OK|SSL_ST_ACCEPT:
229
230                         s->server=1;
231                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
232
233                         if ((s->version>>8) != 3)
234                                 {
235                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
236                                 return -1;
237                                 }
238                         s->type=SSL_ST_ACCEPT;
239
240                         if (s->init_buf == NULL)
241                                 {
242                                 if ((buf=BUF_MEM_new()) == NULL)
243                                         {
244                                         ret= -1;
245                                         goto end;
246                                         }
247                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
248                                         {
249                                         ret= -1;
250                                         goto end;
251                                         }
252                                 s->init_buf=buf;
253                                 }
254
255                         if (!ssl3_setup_buffers(s))
256                                 {
257                                 ret= -1;
258                                 goto end;
259                                 }
260
261                         s->init_num=0;
262
263                         if (s->state != SSL_ST_RENEGOTIATE)
264                                 {
265                                 /* Ok, we now need to push on a buffering BIO so that
266                                  * the output is sent in a way that TCP likes :-)
267                                  */
268                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
269                                 
270                                 ssl3_init_finished_mac(s);
271                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
272                                 s->ctx->stats.sess_accept++;
273                                 }
274                         else
275                                 {
276                                 /* s->state == SSL_ST_RENEGOTIATE,
277                                  * we will just send a HelloRequest */
278                                 s->ctx->stats.sess_accept_renegotiate++;
279                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
280                                 }
281                         break;
282
283                 case SSL3_ST_SW_HELLO_REQ_A:
284                 case SSL3_ST_SW_HELLO_REQ_B:
285
286                         s->shutdown=0;
287                         ret=ssl3_send_hello_request(s);
288                         if (ret <= 0) goto end;
289                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
290                         s->state=SSL3_ST_SW_FLUSH;
291                         s->init_num=0;
292
293                         ssl3_init_finished_mac(s);
294                         break;
295
296                 case SSL3_ST_SW_HELLO_REQ_C:
297                         s->state=SSL_ST_OK;
298                         break;
299
300                 case SSL3_ST_SR_CLNT_HELLO_A:
301                 case SSL3_ST_SR_CLNT_HELLO_B:
302                 case SSL3_ST_SR_CLNT_HELLO_C:
303
304                         s->shutdown=0;
305                         ret=ssl3_get_client_hello(s);
306                         if (ret <= 0) goto end;
307                         
308                         s->new_session = 2;
309                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
310                         s->init_num=0;
311                         break;
312
313                 case SSL3_ST_SW_SRVR_HELLO_A:
314                 case SSL3_ST_SW_SRVR_HELLO_B:
315                         ret=ssl3_send_server_hello(s);
316                         if (ret <= 0) goto end;
317 #ifndef OPENSSL_NO_TLSEXT
318                         if (s->hit)
319                                 {
320                                 if (s->tlsext_ticket_expected)
321                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
322                                 else
323                                         s->state=SSL3_ST_SW_CHANGE_A;
324                                 }
325 #else
326                         if (s->hit)
327                                         s->state=SSL3_ST_SW_CHANGE_A;
328 #endif
329                         else
330                                 s->state=SSL3_ST_SW_CERT_A;
331                         s->init_num=0;
332                         break;
333
334                 case SSL3_ST_SW_CERT_A:
335                 case SSL3_ST_SW_CERT_B:
336                         /* Check if it is anon DH or anon ECDH, */
337                         /* normal PSK or KRB5 */
338                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
339                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
340                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
341                                 {
342                                 ret=ssl3_send_server_certificate(s);
343                                 if (ret <= 0) goto end;
344 #ifndef OPENSSL_NO_TLSEXT
345                                 if (s->tlsext_status_expected)
346                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
347                                 else
348                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
349                                 }
350                         else
351                                 {
352                                 skip = 1;
353                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
354                                 }
355 #else
356                                 }
357                         else
358                                 skip=1;
359
360                         s->state=SSL3_ST_SW_KEY_EXCH_A;
361 #endif
362                         s->init_num=0;
363                         break;
364
365                 case SSL3_ST_SW_KEY_EXCH_A:
366                 case SSL3_ST_SW_KEY_EXCH_B:
367                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
368
369                         /* clear this, it may get reset by
370                          * send_server_key_exchange */
371                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
372 #ifndef OPENSSL_NO_KRB5
373                                 && !(alg_k & SSL_kKRB5)
374 #endif /* OPENSSL_NO_KRB5 */
375                                 )
376                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
377                                  * even when forbidden by protocol specs
378                                  * (handshake may fail as clients are not required to
379                                  * be able to handle this) */
380                                 s->s3->tmp.use_rsa_tmp=1;
381                         else
382                                 s->s3->tmp.use_rsa_tmp=0;
383
384
385                         /* only send if a DH key exchange, fortezza or
386                          * RSA but we have a sign only certificate
387                          *
388                          * PSK: may send PSK identity hints
389                          *
390                          * For ECC ciphersuites, we send a serverKeyExchange
391                          * message only if the cipher suite is either
392                          * ECDH-anon or ECDHE. In other cases, the
393                          * server certificate contains the server's
394                          * public key for key exchange.
395                          */
396                         if (s->s3->tmp.use_rsa_tmp
397                         /* PSK: send ServerKeyExchange if PSK identity
398                          * hint if provided */
399 #ifndef OPENSSL_NO_PSK
400                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
401 #endif
402                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
403                             || (alg_k & SSL_kEECDH)
404                             || ((alg_k & SSL_kRSA)
405                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
406                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
407                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
408                                         )
409                                     )
410                                 )
411                             )
412                                 {
413                                 ret=ssl3_send_server_key_exchange(s);
414                                 if (ret <= 0) goto end;
415                                 }
416                         else
417                                 skip=1;
418
419                         s->state=SSL3_ST_SW_CERT_REQ_A;
420                         s->init_num=0;
421                         break;
422
423                 case SSL3_ST_SW_CERT_REQ_A:
424                 case SSL3_ST_SW_CERT_REQ_B:
425                         if (/* don't request cert unless asked for it: */
426                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
427                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
428                                  * don't request cert during re-negotiation: */
429                                 ((s->session->peer != NULL) &&
430                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
431                                 /* never request cert in anonymous ciphersuites
432                                  * (see section "Certificate request" in SSL 3 drafts
433                                  * and in RFC 2246): */
434                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
435                                  /* ... except when the application insists on verification
436                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
437                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
438                                  /* never request cert in Kerberos ciphersuites */
439                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
440                                 /* With normal PSK Certificates and
441                                  * Certificate Requests are omitted */
442                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
443                                 {
444                                 /* no cert request */
445                                 skip=1;
446                                 s->s3->tmp.cert_request=0;
447                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
448                                 }
449                         else
450                                 {
451                                 s->s3->tmp.cert_request=1;
452                                 ret=ssl3_send_certificate_request(s);
453                                 if (ret <= 0) goto end;
454 #ifndef NETSCAPE_HANG_BUG
455                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
456 #else
457                                 s->state=SSL3_ST_SW_FLUSH;
458                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
459 #endif
460                                 s->init_num=0;
461                                 }
462                         break;
463
464                 case SSL3_ST_SW_SRVR_DONE_A:
465                 case SSL3_ST_SW_SRVR_DONE_B:
466                         ret=ssl3_send_server_done(s);
467                         if (ret <= 0) goto end;
468                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
469                         s->state=SSL3_ST_SW_FLUSH;
470                         s->init_num=0;
471                         break;
472                 
473                 case SSL3_ST_SW_FLUSH:
474                         /* number of bytes to be flushed */
475                         num1=BIO_ctrl(s->wbio,BIO_CTRL_WPENDING,0,NULL);
476                         if (num1 > 0)
477                                 {
478                                 s->rwstate=SSL_WRITING;
479                                 num1=BIO_flush(s->wbio);
480                                 if (num1 <= 0) { ret= -1; goto end; }
481                                 s->rwstate=SSL_NOTHING;
482                                 }
483
484                         s->state=s->s3->tmp.next_state;
485                         break;
486
487                 case SSL3_ST_SR_CERT_A:
488                 case SSL3_ST_SR_CERT_B:
489                         /* Check for second client hello (MS SGC) */
490                         ret = ssl3_check_client_hello(s);
491                         if (ret <= 0)
492                                 goto end;
493                         if (ret == 2)
494                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
495                         else {
496                                 if (s->s3->tmp.cert_request)
497                                         {
498                                         ret=ssl3_get_client_certificate(s);
499                                         if (ret <= 0) goto end;
500                                         }
501                                 s->init_num=0;
502                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
503                         }
504                         break;
505
506                 case SSL3_ST_SR_KEY_EXCH_A:
507                 case SSL3_ST_SR_KEY_EXCH_B:
508                         ret=ssl3_get_client_key_exchange(s);
509                         if (ret <= 0)
510                                 goto end;
511                         if (ret == 2)
512                                 {
513                                 /* For the ECDH ciphersuites when
514                                  * the client sends its ECDH pub key in
515                                  * a certificate, the CertificateVerify
516                                  * message is not sent.
517                                  * Also for GOST ciphersuites when
518                                  * the client uses its key from the certificate
519                                  * for key exchange.
520                                  */
521                                 s->state=SSL3_ST_SR_FINISHED_A;
522                                 s->init_num = 0;
523                                 }
524                         else
525                                 {
526                                 int offset=0;
527                                 int dgst_num;
528
529                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
530                                 s->init_num=0;
531
532                                 /* We need to get hashes here so if there is
533                                  * a client cert, it can be verified
534                                  * FIXME - digest processing for CertificateVerify
535                                  * should be generalized. But it is next step
536                                  */
537                                 if (s->s3->handshake_buffer)
538                                         if (!ssl3_digest_cached_records(s))
539                                                 return -1;
540                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
541                                         if (s->s3->handshake_dgst[dgst_num]) 
542                                                 {
543                                                 int dgst_size;
544
545                                                 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]));
546                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
547                                                 if (dgst_size < 0)
548                                                         {
549                                                         ret = -1;
550                                                         goto end;
551                                                         }
552                                                 offset+=dgst_size;
553                                                 }               
554                                 }
555                         break;
556
557                 case SSL3_ST_SR_CERT_VRFY_A:
558                 case SSL3_ST_SR_CERT_VRFY_B:
559
560                         /* we should decide if we expected this one */
561                         ret=ssl3_get_cert_verify(s);
562                         if (ret <= 0) goto end;
563
564                         s->state=SSL3_ST_SR_FINISHED_A;
565                         s->init_num=0;
566                         break;
567
568                 case SSL3_ST_SR_FINISHED_A:
569                 case SSL3_ST_SR_FINISHED_B:
570                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
571                                 SSL3_ST_SR_FINISHED_B);
572                         if (ret <= 0) goto end;
573 #ifndef OPENSSL_NO_TLSEXT
574                         if (s->tlsext_ticket_expected)
575                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
576                         else if (s->hit)
577                                 s->state=SSL_ST_OK;
578 #else
579                         if (s->hit)
580                                 s->state=SSL_ST_OK;
581 #endif
582                         else
583                                 s->state=SSL3_ST_SW_CHANGE_A;
584                         s->init_num=0;
585                         break;
586
587 #ifndef OPENSSL_NO_TLSEXT
588                 case SSL3_ST_SW_SESSION_TICKET_A:
589                 case SSL3_ST_SW_SESSION_TICKET_B:
590                         ret=ssl3_send_newsession_ticket(s);
591                         if (ret <= 0) goto end;
592                         s->state=SSL3_ST_SW_CHANGE_A;
593                         s->init_num=0;
594                         break;
595
596                 case SSL3_ST_SW_CERT_STATUS_A:
597                 case SSL3_ST_SW_CERT_STATUS_B:
598                         ret=ssl3_send_cert_status(s);
599                         if (ret <= 0) goto end;
600                         s->state=SSL3_ST_SW_KEY_EXCH_A;
601                         s->init_num=0;
602                         break;
603
604 #endif
605
606                 case SSL3_ST_SW_CHANGE_A:
607                 case SSL3_ST_SW_CHANGE_B:
608
609                         s->session->cipher=s->s3->tmp.new_cipher;
610                         if (!s->method->ssl3_enc->setup_key_block(s))
611                                 { ret= -1; goto end; }
612
613                         ret=ssl3_send_change_cipher_spec(s,
614                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
615
616                         if (ret <= 0) goto end;
617                         s->state=SSL3_ST_SW_FINISHED_A;
618                         s->init_num=0;
619
620                         if (!s->method->ssl3_enc->change_cipher_state(s,
621                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
622                                 {
623                                 ret= -1;
624                                 goto end;
625                                 }
626
627                         break;
628
629                 case SSL3_ST_SW_FINISHED_A:
630                 case SSL3_ST_SW_FINISHED_B:
631                         ret=ssl3_send_finished(s,
632                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
633                                 s->method->ssl3_enc->server_finished_label,
634                                 s->method->ssl3_enc->server_finished_label_len);
635                         if (ret <= 0) goto end;
636                         s->state=SSL3_ST_SW_FLUSH;
637                         if (s->hit)
638                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
639                         else
640                                 s->s3->tmp.next_state=SSL_ST_OK;
641                         s->init_num=0;
642                         break;
643
644                 case SSL_ST_OK:
645                         /* clean a few things up */
646                         ssl3_cleanup_key_block(s);
647
648                         BUF_MEM_free(s->init_buf);
649                         s->init_buf=NULL;
650
651                         /* remove buffering on output */
652                         ssl_free_wbio_buffer(s);
653
654                         s->init_num=0;
655
656                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
657                                 {
658                                 /* actually not necessarily a 'new' session unless
659                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
660                                 
661                                 s->new_session=0;
662                                 
663                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
664                                 
665                                 s->ctx->stats.sess_accept_good++;
666                                 /* s->server=1; */
667                                 s->handshake_func=ssl3_accept;
668
669                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
670                                 }
671                         
672                         ret = 1;
673                         goto end;
674                         /* break; */
675
676                 default:
677                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
678                         ret= -1;
679                         goto end;
680                         /* break; */
681                         }
682                 
683                 if (!s->s3->tmp.reuse_message && !skip)
684                         {
685                         if (s->debug)
686                                 {
687                                 if ((ret=BIO_flush(s->wbio)) <= 0)
688                                         goto end;
689                                 }
690
691
692                         if ((cb != NULL) && (s->state != state))
693                                 {
694                                 new_state=s->state;
695                                 s->state=state;
696                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
697                                 s->state=new_state;
698                                 }
699                         }
700                 skip=0;
701                 }
702 end:
703         /* BIO_flush(s->wbio); */
704
705         s->in_handshake--;
706         if (cb != NULL)
707                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
708         return(ret);
709         }
710
711 int ssl3_send_hello_request(SSL *s)
712         {
713         unsigned char *p;
714
715         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
716                 {
717                 p=(unsigned char *)s->init_buf->data;
718                 *(p++)=SSL3_MT_HELLO_REQUEST;
719                 *(p++)=0;
720                 *(p++)=0;
721                 *(p++)=0;
722
723                 s->state=SSL3_ST_SW_HELLO_REQ_B;
724                 /* number of bytes to write */
725                 s->init_num=4;
726                 s->init_off=0;
727                 }
728
729         /* SSL3_ST_SW_HELLO_REQ_B */
730         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
731         }
732
733 int ssl3_check_client_hello(SSL *s)
734         {
735         int ok;
736         long n;
737
738         /* this function is called when we really expect a Certificate message,
739          * so permit appropriate message length */
740         n=s->method->ssl_get_message(s,
741                 SSL3_ST_SR_CERT_A,
742                 SSL3_ST_SR_CERT_B,
743                 -1,
744                 s->max_cert_list,
745                 &ok);
746         if (!ok) return((int)n);
747         s->s3->tmp.reuse_message = 1;
748         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
749                 {
750                 /* Throw away what we have done so far in the current handshake,
751                  * which will now be aborted. (A full SSL_clear would be too much.)
752                  * I hope that tmp.dh is the only thing that may need to be cleared
753                  * when a handshake is not completed ... */
754 #ifndef OPENSSL_NO_DH
755                 if (s->s3->tmp.dh != NULL)
756                         {
757                         DH_free(s->s3->tmp.dh);
758                         s->s3->tmp.dh = NULL;
759                         }
760 #endif
761                 return 2;
762                 }
763         return 1;
764 }
765
766 int ssl3_get_client_hello(SSL *s)
767         {
768         int i,j,ok,al,ret= -1;
769         unsigned int cookie_len;
770         long n;
771         unsigned long id;
772         unsigned char *p,*d,*q;
773         SSL_CIPHER *c;
774 #ifndef OPENSSL_NO_COMP
775         SSL_COMP *comp=NULL;
776 #endif
777         STACK_OF(SSL_CIPHER) *ciphers=NULL;
778
779         /* We do this so that we will respond with our native type.
780          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
781          * This down switching should be handled by a different method.
782          * If we are SSLv3, we will respond with SSLv3, even if prompted with
783          * TLSv1.
784          */
785         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
786                 {
787                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
788                 }
789         s->first_packet=1;
790         n=s->method->ssl_get_message(s,
791                 SSL3_ST_SR_CLNT_HELLO_B,
792                 SSL3_ST_SR_CLNT_HELLO_C,
793                 SSL3_MT_CLIENT_HELLO,
794                 SSL3_RT_MAX_PLAIN_LENGTH,
795                 &ok);
796
797         if (!ok) return((int)n);
798         s->first_packet=0;
799         d=p=(unsigned char *)s->init_msg;
800
801         /* use version from inside client hello, not from record header
802          * (may differ: see RFC 2246, Appendix E, second paragraph) */
803         s->client_version=(((int)p[0])<<8)|(int)p[1];
804         p+=2;
805
806         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
807             (s->version != DTLS1_VERSION && s->client_version < s->version))
808                 {
809                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
810                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
811                         {
812                         /* similar to ssl3_get_record, send alert using remote version number */
813                         s->version = s->client_version;
814                         }
815                 al = SSL_AD_PROTOCOL_VERSION;
816                 goto f_err;
817                 }
818
819         /* If we require cookies and this ClientHello doesn't
820          * contain one, just return since we do not want to
821          * allocate any memory yet. So check cookie length...
822          */
823         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
824                 {
825                 unsigned int session_length, cookie_length;
826                 
827                 session_length = *(p + SSL3_RANDOM_SIZE);
828                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
829
830                 if (cookie_length == 0)
831                         return 1;
832                 }
833
834         /* load the client random */
835         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
836         p+=SSL3_RANDOM_SIZE;
837
838         /* get the session-id */
839         j= *(p++);
840
841         s->hit=0;
842         /* Versions before 0.9.7 always allow session reuse during renegotiation
843          * (i.e. when s->new_session is true), option
844          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
845          * Maybe this optional behaviour should always have been the default,
846          * but we cannot safely change the default behaviour (or new applications
847          * might be written that become totally unsecure when compiled with
848          * an earlier library version)
849          */
850         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
851                 {
852                 if (!ssl_get_new_session(s,1))
853                         goto err;
854                 }
855         else
856                 {
857                 i=ssl_get_prev_session(s, p, j, d + n);
858                 if (i == 1)
859                         { /* previous session */
860                         s->hit=1;
861                         }
862                 else if (i == -1)
863                         goto err;
864                 else /* i == 0 */
865                         {
866                         if (!ssl_get_new_session(s,1))
867                                 goto err;
868                         }
869                 }
870
871         p+=j;
872
873         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
874                 {
875                 /* cookie stuff */
876                 cookie_len = *(p++);
877
878                 /* 
879                  * The ClientHello may contain a cookie even if the
880                  * HelloVerify message has not been sent--make sure that it
881                  * does not cause an overflow.
882                  */
883                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
884                         {
885                         /* too much data */
886                         al = SSL_AD_DECODE_ERROR;
887                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
888                         goto f_err;
889                         }
890
891                 /* verify the cookie if appropriate option is set. */
892                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
893                         cookie_len > 0)
894                         {
895                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
896
897                         if ( s->ctx->app_verify_cookie_cb != NULL)
898                                 {
899                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
900                                         cookie_len) == 0)
901                                         {
902                                         al=SSL_AD_HANDSHAKE_FAILURE;
903                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
904                                                 SSL_R_COOKIE_MISMATCH);
905                                         goto f_err;
906                                         }
907                                 /* else cookie verification succeeded */
908                                 }
909                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
910                                                   s->d1->cookie_len) != 0) /* default verification */
911                                 {
912                                         al=SSL_AD_HANDSHAKE_FAILURE;
913                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
914                                                 SSL_R_COOKIE_MISMATCH);
915                                         goto f_err;
916                                 }
917
918                         ret = 2;
919                         }
920
921                 p += cookie_len;
922                 }
923
924         n2s(p,i);
925         if ((i == 0) && (j != 0))
926                 {
927                 /* we need a cipher if we are not resuming a session */
928                 al=SSL_AD_ILLEGAL_PARAMETER;
929                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
930                 goto f_err;
931                 }
932         if ((p+i) >= (d+n))
933                 {
934                 /* not enough data */
935                 al=SSL_AD_DECODE_ERROR;
936                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
937                 goto f_err;
938                 }
939         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
940                 == NULL))
941                 {
942                 goto err;
943                 }
944         p+=i;
945
946         /* If it is a hit, check that the cipher is in the list */
947         if ((s->hit) && (i > 0))
948                 {
949                 j=0;
950                 id=s->session->cipher->id;
951
952 #ifdef CIPHER_DEBUG
953                 printf("client sent %d ciphers\n",sk_num(ciphers));
954 #endif
955                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
956                         {
957                         c=sk_SSL_CIPHER_value(ciphers,i);
958 #ifdef CIPHER_DEBUG
959                         printf("client [%2d of %2d]:%s\n",
960                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
961 #endif
962                         if (c->id == id)
963                                 {
964                                 j=1;
965                                 break;
966                                 }
967                         }
968                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
969                         {
970                         /* Special case as client bug workaround: the previously used cipher may
971                          * not be in the current list, the client instead might be trying to
972                          * continue using a cipher that before wasn't chosen due to server
973                          * preferences.  We'll have to reject the connection if the cipher is not
974                          * enabled, though. */
975                         c = sk_SSL_CIPHER_value(ciphers, 0);
976                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
977                                 {
978                                 s->session->cipher = c;
979                                 j = 1;
980                                 }
981                         }
982                 if (j == 0)
983                         {
984                         /* we need to have the cipher in the cipher
985                          * list if we are asked to reuse it */
986                         al=SSL_AD_ILLEGAL_PARAMETER;
987                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
988                         goto f_err;
989                         }
990                 }
991
992         /* compression */
993         i= *(p++);
994         if ((p+i) > (d+n))
995                 {
996                 /* not enough data */
997                 al=SSL_AD_DECODE_ERROR;
998                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
999                 goto f_err;
1000                 }
1001         q=p;
1002         for (j=0; j<i; j++)
1003                 {
1004                 if (p[j] == 0) break;
1005                 }
1006
1007         p+=i;
1008         if (j >= i)
1009                 {
1010                 /* no compress */
1011                 al=SSL_AD_DECODE_ERROR;
1012                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1013                 goto f_err;
1014                 }
1015
1016 #ifndef OPENSSL_NO_TLSEXT
1017         /* TLS extensions*/
1018         if (s->version >= SSL3_VERSION)
1019                 {
1020                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1021                         {
1022                         /* 'al' set by ssl_parse_clienthello_tlsext */
1023                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1024                         goto f_err;
1025                         }
1026                 }
1027                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1028                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1029                         goto err;
1030                 }
1031
1032         /* Check if we want to use external pre-shared secret for this
1033          * handshake for not reused session only. We need to generate
1034          * server_random before calling tls_session_secret_cb in order to allow
1035          * SessionTicket processing to use it in key derivation. */
1036         {
1037                 unsigned long Time;
1038                 unsigned char *pos;
1039                 Time=(unsigned long)time(NULL);                 /* Time */
1040                 pos=s->s3->server_random;
1041                 l2n(Time,pos);
1042                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1043                         {
1044                         al=SSL_AD_INTERNAL_ERROR;
1045                         goto f_err;
1046                         }
1047         }
1048
1049         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1050                 {
1051                 SSL_CIPHER *pref_cipher=NULL;
1052
1053                 s->session->master_key_length=sizeof(s->session->master_key);
1054                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1055                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1056                         {
1057                         s->hit=1;
1058                         s->session->ciphers=ciphers;
1059                         s->session->verify_result=X509_V_OK;
1060
1061                         ciphers=NULL;
1062
1063                         /* check if some cipher was preferred by call back */
1064                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1065                         if (pref_cipher == NULL)
1066                                 {
1067                                 al=SSL_AD_HANDSHAKE_FAILURE;
1068                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1069                                 goto f_err;
1070                                 }
1071
1072                         s->session->cipher=pref_cipher;
1073
1074                         if (s->cipher_list)
1075                                 sk_SSL_CIPHER_free(s->cipher_list);
1076
1077                         if (s->cipher_list_by_id)
1078                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1079
1080                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1081                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1082                         }
1083                 }
1084 #endif
1085
1086         /* Worst case, we will use the NULL compression, but if we have other
1087          * options, we will now look for them.  We have i-1 compression
1088          * algorithms from the client, starting at q. */
1089         s->s3->tmp.new_compression=NULL;
1090 #ifndef OPENSSL_NO_COMP
1091         /* This only happens if we have a cache hit */
1092         if (s->session->compress_meth != 0)
1093                 {
1094                 int m, comp_id = s->session->compress_meth;
1095                 /* Perform sanity checks on resumed compression algorithm */
1096                 /* Can't disable compression */
1097                 if (s->options & SSL_OP_NO_COMPRESSION)
1098                         {
1099                         al=SSL_AD_INTERNAL_ERROR;
1100                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1101                         goto f_err;
1102                         }
1103                 /* Look for resumed compression method */
1104                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1105                         {
1106                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1107                         if (comp_id == comp->id)
1108                                 {
1109                                 s->s3->tmp.new_compression=comp;
1110                                 break;
1111                                 }
1112                         }
1113                 if (s->s3->tmp.new_compression == NULL)
1114                         {
1115                         al=SSL_AD_INTERNAL_ERROR;
1116                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1117                         goto f_err;
1118                         }
1119                 /* Look for resumed method in compression list */
1120                 for (m = 0; m < i; m++)
1121                         {
1122                         if (q[m] == comp_id)
1123                                 break;
1124                         }
1125                 if (m >= i)
1126                         {
1127                         al=SSL_AD_ILLEGAL_PARAMETER;
1128                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1129                         goto f_err;
1130                         }
1131                 }
1132         else if (s->hit)
1133                 comp = NULL;
1134         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1135                 { /* See if we have a match */
1136                 int m,nn,o,v,done=0;
1137
1138                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1139                 for (m=0; m<nn; m++)
1140                         {
1141                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1142                         v=comp->id;
1143                         for (o=0; o<i; o++)
1144                                 {
1145                                 if (v == q[o])
1146                                         {
1147                                         done=1;
1148                                         break;
1149                                         }
1150                                 }
1151                         if (done) break;
1152                         }
1153                 if (done)
1154                         s->s3->tmp.new_compression=comp;
1155                 else
1156                         comp=NULL;
1157                 }
1158 #else
1159         /* If compression is disabled we'd better not try to resume a session
1160          * using compression.
1161          */
1162         if (s->session->compress_meth != 0)
1163                 {
1164                 al=SSL_AD_INTERNAL_ERROR;
1165                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1166                 goto f_err;
1167                 }
1168 #endif
1169
1170         /* Given s->session->ciphers and SSL_get_ciphers, we must
1171          * pick a cipher */
1172
1173         if (!s->hit)
1174                 {
1175 #ifdef OPENSSL_NO_COMP
1176                 s->session->compress_meth=0;
1177 #else
1178                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1179 #endif
1180                 if (s->session->ciphers != NULL)
1181                         sk_SSL_CIPHER_free(s->session->ciphers);
1182                 s->session->ciphers=ciphers;
1183                 if (ciphers == NULL)
1184                         {
1185                         al=SSL_AD_ILLEGAL_PARAMETER;
1186                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1187                         goto f_err;
1188                         }
1189                 ciphers=NULL;
1190                 c=ssl3_choose_cipher(s,s->session->ciphers,
1191                                      SSL_get_ciphers(s));
1192
1193                 if (c == NULL)
1194                         {
1195                         al=SSL_AD_HANDSHAKE_FAILURE;
1196                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1197                         goto f_err;
1198                         }
1199                 s->s3->tmp.new_cipher=c;
1200                 }
1201         else
1202                 {
1203                 /* Session-id reuse */
1204 #ifdef REUSE_CIPHER_BUG
1205                 STACK_OF(SSL_CIPHER) *sk;
1206                 SSL_CIPHER *nc=NULL;
1207                 SSL_CIPHER *ec=NULL;
1208
1209                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1210                         {
1211                         sk=s->session->ciphers;
1212                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1213                                 {
1214                                 c=sk_SSL_CIPHER_value(sk,i);
1215                                 if (c->algorithm_enc & SSL_eNULL)
1216                                         nc=c;
1217                                 if (SSL_C_IS_EXPORT(c))
1218                                         ec=c;
1219                                 }
1220                         if (nc != NULL)
1221                                 s->s3->tmp.new_cipher=nc;
1222                         else if (ec != NULL)
1223                                 s->s3->tmp.new_cipher=ec;
1224                         else
1225                                 s->s3->tmp.new_cipher=s->session->cipher;
1226                         }
1227                 else
1228 #endif
1229                 s->s3->tmp.new_cipher=s->session->cipher;
1230                 }
1231
1232         if (!ssl3_digest_cached_records(s))
1233                 goto f_err;
1234         
1235         /* we now have the following setup. 
1236          * client_random
1237          * cipher_list          - our prefered list of ciphers
1238          * ciphers              - the clients prefered list of ciphers
1239          * compression          - basically ignored right now
1240          * ssl version is set   - sslv3
1241          * s->session           - The ssl session has been setup.
1242          * s->hit               - session reuse flag
1243          * s->tmp.new_cipher    - the new cipher to use.
1244          */
1245
1246         if (ret < 0) ret=1;
1247         if (0)
1248                 {
1249 f_err:
1250                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1251                 }
1252 err:
1253         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1254         return(ret);
1255         }
1256
1257 int ssl3_send_server_hello(SSL *s)
1258         {
1259         unsigned char *buf;
1260         unsigned char *p,*d;
1261         int i,sl;
1262         unsigned long l;
1263 #ifdef OPENSSL_NO_TLSEXT
1264         unsigned long Time;
1265 #endif
1266
1267         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1268                 {
1269                 buf=(unsigned char *)s->init_buf->data;
1270 #ifdef OPENSSL_NO_TLSEXT
1271                 p=s->s3->server_random;
1272                 /* Generate server_random if it was not needed previously */
1273                 Time=(unsigned long)time(NULL);                 /* Time */
1274                 l2n(Time,p);
1275                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1276                         return -1;
1277 #endif
1278                 /* Do the message type and length last */
1279                 d=p= &(buf[4]);
1280
1281                 *(p++)=s->version>>8;
1282                 *(p++)=s->version&0xff;
1283
1284                 /* Random stuff */
1285                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1286                 p+=SSL3_RANDOM_SIZE;
1287
1288                 /* now in theory we have 3 options to sending back the
1289                  * session id.  If it is a re-use, we send back the
1290                  * old session-id, if it is a new session, we send
1291                  * back the new session-id or we send back a 0 length
1292                  * session-id if we want it to be single use.
1293                  * Currently I will not implement the '0' length session-id
1294                  * 12-Jan-98 - I'll now support the '0' length stuff.
1295                  *
1296                  * We also have an additional case where stateless session
1297                  * resumption is successful: we always send back the old
1298                  * session id. In this case s->hit is non zero: this can
1299                  * only happen if stateless session resumption is succesful
1300                  * if session caching is disabled so existing functionality
1301                  * is unaffected.
1302                  */
1303                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1304                         && !s->hit)
1305                         s->session->session_id_length=0;
1306
1307                 sl=s->session->session_id_length;
1308                 if (sl > (int)sizeof(s->session->session_id))
1309                         {
1310                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1311                         return -1;
1312                         }
1313                 *(p++)=sl;
1314                 memcpy(p,s->session->session_id,sl);
1315                 p+=sl;
1316
1317                 /* put the cipher */
1318                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1319                 p+=i;
1320
1321                 /* put the compression method */
1322 #ifdef OPENSSL_NO_COMP
1323                         *(p++)=0;
1324 #else
1325                 if (s->s3->tmp.new_compression == NULL)
1326                         *(p++)=0;
1327                 else
1328                         *(p++)=s->s3->tmp.new_compression->id;
1329 #endif
1330 #ifndef OPENSSL_NO_TLSEXT
1331                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1332                         {
1333                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1334                         return -1;
1335                         }
1336                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1337                         {
1338                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1339                         return -1;
1340                         }
1341 #endif
1342                 /* do the header */
1343                 l=(p-d);
1344                 d=buf;
1345                 *(d++)=SSL3_MT_SERVER_HELLO;
1346                 l2n3(l,d);
1347
1348                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1349                 /* number of bytes to write */
1350                 s->init_num=p-buf;
1351                 s->init_off=0;
1352                 }
1353
1354         /* SSL3_ST_SW_SRVR_HELLO_B */
1355         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1356         }
1357
1358 int ssl3_send_server_done(SSL *s)
1359         {
1360         unsigned char *p;
1361
1362         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1363                 {
1364                 p=(unsigned char *)s->init_buf->data;
1365
1366                 /* do the header */
1367                 *(p++)=SSL3_MT_SERVER_DONE;
1368                 *(p++)=0;
1369                 *(p++)=0;
1370                 *(p++)=0;
1371
1372                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1373                 /* number of bytes to write */
1374                 s->init_num=4;
1375                 s->init_off=0;
1376                 }
1377
1378         /* SSL3_ST_SW_SRVR_DONE_B */
1379         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1380         }
1381
1382 int ssl3_send_server_key_exchange(SSL *s)
1383         {
1384 #ifndef OPENSSL_NO_RSA
1385         unsigned char *q;
1386         int j,num;
1387         RSA *rsa;
1388         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1389         unsigned int u;
1390 #endif
1391 #ifndef OPENSSL_NO_DH
1392         DH *dh=NULL,*dhp;
1393 #endif
1394 #ifndef OPENSSL_NO_ECDH
1395         EC_KEY *ecdh=NULL, *ecdhp;
1396         unsigned char *encodedPoint = NULL;
1397         int encodedlen = 0;
1398         int curve_id = 0;
1399         BN_CTX *bn_ctx = NULL; 
1400 #endif
1401         EVP_PKEY *pkey;
1402         unsigned char *p,*d;
1403         int al,i;
1404         unsigned long type;
1405         int n;
1406         CERT *cert;
1407         BIGNUM *r[4];
1408         int nr[4],kn;
1409         BUF_MEM *buf;
1410         EVP_MD_CTX md_ctx;
1411
1412         EVP_MD_CTX_init(&md_ctx);
1413         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1414                 {
1415                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1416                 cert=s->cert;
1417
1418                 buf=s->init_buf;
1419
1420                 r[0]=r[1]=r[2]=r[3]=NULL;
1421                 n=0;
1422 #ifndef OPENSSL_NO_RSA
1423                 if (type & SSL_kRSA)
1424                         {
1425                         rsa=cert->rsa_tmp;
1426                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1427                                 {
1428                                 rsa=s->cert->rsa_tmp_cb(s,
1429                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1430                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1431                                 if(rsa == NULL)
1432                                 {
1433                                         al=SSL_AD_HANDSHAKE_FAILURE;
1434                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1435                                         goto f_err;
1436                                 }
1437                                 RSA_up_ref(rsa);
1438                                 cert->rsa_tmp=rsa;
1439                                 }
1440                         if (rsa == NULL)
1441                                 {
1442                                 al=SSL_AD_HANDSHAKE_FAILURE;
1443                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1444                                 goto f_err;
1445                                 }
1446                         r[0]=rsa->n;
1447                         r[1]=rsa->e;
1448                         s->s3->tmp.use_rsa_tmp=1;
1449                         }
1450                 else
1451 #endif
1452 #ifndef OPENSSL_NO_DH
1453                         if (type & SSL_kEDH)
1454                         {
1455                         dhp=cert->dh_tmp;
1456                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1457                                 dhp=s->cert->dh_tmp_cb(s,
1458                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1459                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1460                         if (dhp == NULL)
1461                                 {
1462                                 al=SSL_AD_HANDSHAKE_FAILURE;
1463                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1464                                 goto f_err;
1465                                 }
1466
1467                         if (s->s3->tmp.dh != NULL)
1468                                 {
1469                                 DH_free(dh);
1470                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1471                                 goto err;
1472                                 }
1473
1474                         if ((dh=DHparams_dup(dhp)) == NULL)
1475                                 {
1476                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1477                                 goto err;
1478                                 }
1479
1480                         s->s3->tmp.dh=dh;
1481                         if ((dhp->pub_key == NULL ||
1482                              dhp->priv_key == NULL ||
1483                              (s->options & SSL_OP_SINGLE_DH_USE)))
1484                                 {
1485                                 if(!DH_generate_key(dh))
1486                                     {
1487                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1488                                            ERR_R_DH_LIB);
1489                                     goto err;
1490                                     }
1491                                 }
1492                         else
1493                                 {
1494                                 dh->pub_key=BN_dup(dhp->pub_key);
1495                                 dh->priv_key=BN_dup(dhp->priv_key);
1496                                 if ((dh->pub_key == NULL) ||
1497                                         (dh->priv_key == NULL))
1498                                         {
1499                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1500                                         goto err;
1501                                         }
1502                                 }
1503                         r[0]=dh->p;
1504                         r[1]=dh->g;
1505                         r[2]=dh->pub_key;
1506                         }
1507                 else 
1508 #endif
1509 #ifndef OPENSSL_NO_ECDH
1510                         if (type & SSL_kEECDH)
1511                         {
1512                         const EC_GROUP *group;
1513
1514                         ecdhp=cert->ecdh_tmp;
1515                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1516                                 {
1517                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1518                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1519                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1520                                 }
1521                         if (ecdhp == NULL)
1522                                 {
1523                                 al=SSL_AD_HANDSHAKE_FAILURE;
1524                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1525                                 goto f_err;
1526                                 }
1527
1528                         if (s->s3->tmp.ecdh != NULL)
1529                                 {
1530                                 EC_KEY_free(s->s3->tmp.ecdh); 
1531                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1532                                 goto err;
1533                                 }
1534
1535                         /* Duplicate the ECDH structure. */
1536                         if (ecdhp == NULL)
1537                                 {
1538                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1539                                 goto err;
1540                                 }
1541                         if (!EC_KEY_up_ref(ecdhp))
1542                                 {
1543                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1544                                 goto err;
1545                                 }
1546                         ecdh = ecdhp;
1547
1548                         s->s3->tmp.ecdh=ecdh;
1549                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1550                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1551                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1552                                 {
1553                                 if(!EC_KEY_generate_key(ecdh))
1554                                     {
1555                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1556                                     goto err;
1557                                     }
1558                                 }
1559
1560                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1561                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1562                             (EC_KEY_get0_private_key(ecdh) == NULL))
1563                                 {
1564                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1565                                 goto err;
1566                                 }
1567
1568                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1569                             (EC_GROUP_get_degree(group) > 163)) 
1570                                 {
1571                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1572                                 goto err;
1573                                 }
1574
1575                         /* XXX: For now, we only support ephemeral ECDH
1576                          * keys over named (not generic) curves. For 
1577                          * supported named curves, curve_id is non-zero.
1578                          */
1579                         if ((curve_id = 
1580                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1581                             == 0)
1582                                 {
1583                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1584                                 goto err;
1585                                 }
1586
1587                         /* Encode the public key.
1588                          * First check the size of encoding and
1589                          * allocate memory accordingly.
1590                          */
1591                         encodedlen = EC_POINT_point2oct(group, 
1592                             EC_KEY_get0_public_key(ecdh),
1593                             POINT_CONVERSION_UNCOMPRESSED, 
1594                             NULL, 0, NULL);
1595
1596                         encodedPoint = (unsigned char *) 
1597                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1598                         bn_ctx = BN_CTX_new();
1599                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1600                                 {
1601                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1602                                 goto err;
1603                                 }
1604
1605
1606                         encodedlen = EC_POINT_point2oct(group, 
1607                             EC_KEY_get0_public_key(ecdh), 
1608                             POINT_CONVERSION_UNCOMPRESSED, 
1609                             encodedPoint, encodedlen, bn_ctx);
1610
1611                         if (encodedlen == 0) 
1612                                 {
1613                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1614                                 goto err;
1615                                 }
1616
1617                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1618
1619                         /* XXX: For now, we only support named (not 
1620                          * generic) curves in ECDH ephemeral key exchanges.
1621                          * In this situation, we need four additional bytes
1622                          * to encode the entire ServerECDHParams
1623                          * structure. 
1624                          */
1625                         n = 4 + encodedlen;
1626
1627                         /* We'll generate the serverKeyExchange message
1628                          * explicitly so we can set these to NULLs
1629                          */
1630                         r[0]=NULL;
1631                         r[1]=NULL;
1632                         r[2]=NULL;
1633                         r[3]=NULL;
1634                         }
1635                 else 
1636 #endif /* !OPENSSL_NO_ECDH */
1637 #ifndef OPENSSL_NO_PSK
1638                         if (type & SSL_kPSK)
1639                                 {
1640                                 /* reserve size for record length and PSK identity hint*/
1641                                 n+=2+strlen(s->ctx->psk_identity_hint);
1642                                 }
1643                         else
1644 #endif /* !OPENSSL_NO_PSK */
1645                         {
1646                         al=SSL_AD_HANDSHAKE_FAILURE;
1647                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1648                         goto f_err;
1649                         }
1650                 for (i=0; r[i] != NULL; i++)
1651                         {
1652                         nr[i]=BN_num_bytes(r[i]);
1653                         n+=2+nr[i];
1654                         }
1655
1656                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1657                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1658                         {
1659                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1660                                 == NULL)
1661                                 {
1662                                 al=SSL_AD_DECODE_ERROR;
1663                                 goto f_err;
1664                                 }
1665                         kn=EVP_PKEY_size(pkey);
1666                         }
1667                 else
1668                         {
1669                         pkey=NULL;
1670                         kn=0;
1671                         }
1672
1673                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1674                         {
1675                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1676                         goto err;
1677                         }
1678                 d=(unsigned char *)s->init_buf->data;
1679                 p= &(d[4]);
1680
1681                 for (i=0; r[i] != NULL; i++)
1682                         {
1683                         s2n(nr[i],p);
1684                         BN_bn2bin(r[i],p);
1685                         p+=nr[i];
1686                         }
1687
1688 #ifndef OPENSSL_NO_ECDH
1689                 if (type & SSL_kEECDH) 
1690                         {
1691                         /* XXX: For now, we only support named (not generic) curves.
1692                          * In this situation, the serverKeyExchange message has:
1693                          * [1 byte CurveType], [2 byte CurveName]
1694                          * [1 byte length of encoded point], followed by
1695                          * the actual encoded point itself
1696                          */
1697                         *p = NAMED_CURVE_TYPE;
1698                         p += 1;
1699                         *p = 0;
1700                         p += 1;
1701                         *p = curve_id;
1702                         p += 1;
1703                         *p = encodedlen;
1704                         p += 1;
1705                         memcpy((unsigned char*)p, 
1706                             (unsigned char *)encodedPoint, 
1707                             encodedlen);
1708                         OPENSSL_free(encodedPoint);
1709                         p += encodedlen;
1710                         }
1711 #endif
1712
1713 #ifndef OPENSSL_NO_PSK
1714                 if (type & SSL_kPSK)
1715                         {
1716                         /* copy PSK identity hint */
1717                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1718                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1719                         p+=strlen(s->ctx->psk_identity_hint);
1720                         }
1721 #endif
1722
1723                 /* not anonymous */
1724                 if (pkey != NULL)
1725                         {
1726                         /* n is the length of the params, they start at &(d[4])
1727                          * and p points to the space at the end. */
1728 #ifndef OPENSSL_NO_RSA
1729                         if (pkey->type == EVP_PKEY_RSA)
1730                                 {
1731                                 q=md_buf;
1732                                 j=0;
1733                                 for (num=2; num > 0; num--)
1734                                         {
1735                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1736                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1737                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1738                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1739                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1740                                         EVP_DigestFinal_ex(&md_ctx,q,
1741                                                 (unsigned int *)&i);
1742                                         q+=i;
1743                                         j+=i;
1744                                         }
1745                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1746                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1747                                         {
1748                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1749                                         goto err;
1750                                         }
1751                                 s2n(u,p);
1752                                 n+=u+2;
1753                                 }
1754                         else
1755 #endif
1756 #if !defined(OPENSSL_NO_DSA)
1757                                 if (pkey->type == EVP_PKEY_DSA)
1758                                 {
1759                                 /* lets do DSS */
1760                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1761                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1762                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1763                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1764                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1765                                         (unsigned int *)&i,pkey))
1766                                         {
1767                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1768                                         goto err;
1769                                         }
1770                                 s2n(i,p);
1771                                 n+=i+2;
1772                                 }
1773                         else
1774 #endif
1775 #if !defined(OPENSSL_NO_ECDSA)
1776                                 if (pkey->type == EVP_PKEY_EC)
1777                                 {
1778                                 /* let's do ECDSA */
1779                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1780                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1781                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1782                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1783                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1784                                         (unsigned int *)&i,pkey))
1785                                         {
1786                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1787                                         goto err;
1788                                         }
1789                                 s2n(i,p);
1790                                 n+=i+2;
1791                                 }
1792                         else
1793 #endif
1794                                 {
1795                                 /* Is this error check actually needed? */
1796                                 al=SSL_AD_HANDSHAKE_FAILURE;
1797                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1798                                 goto f_err;
1799                                 }
1800                         }
1801
1802                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1803                 l2n3(n,d);
1804
1805                 /* we should now have things packed up, so lets send
1806                  * it off */
1807                 s->init_num=n+4;
1808                 s->init_off=0;
1809                 }
1810
1811         s->state = SSL3_ST_SW_KEY_EXCH_B;
1812         EVP_MD_CTX_cleanup(&md_ctx);
1813         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1814 f_err:
1815         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1816 err:
1817 #ifndef OPENSSL_NO_ECDH
1818         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1819         BN_CTX_free(bn_ctx);
1820 #endif
1821         EVP_MD_CTX_cleanup(&md_ctx);
1822         return(-1);
1823         }
1824
1825 int ssl3_send_certificate_request(SSL *s)
1826         {
1827         unsigned char *p,*d;
1828         int i,j,nl,off,n;
1829         STACK_OF(X509_NAME) *sk=NULL;
1830         X509_NAME *name;
1831         BUF_MEM *buf;
1832
1833         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1834                 {
1835                 buf=s->init_buf;
1836
1837                 d=p=(unsigned char *)&(buf->data[4]);
1838
1839                 /* get the list of acceptable cert types */
1840                 p++;
1841                 n=ssl3_get_req_cert_type(s,p);
1842                 d[0]=n;
1843                 p+=n;
1844                 n++;
1845
1846                 off=n;
1847                 p+=2;
1848                 n+=2;
1849
1850                 sk=SSL_get_client_CA_list(s);
1851                 nl=0;
1852                 if (sk != NULL)
1853                         {
1854                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1855                                 {
1856                                 name=sk_X509_NAME_value(sk,i);
1857                                 j=i2d_X509_NAME(name,NULL);
1858                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1859                                         {
1860                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1861                                         goto err;
1862                                         }
1863                                 p=(unsigned char *)&(buf->data[4+n]);
1864                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1865                                         {
1866                                         s2n(j,p);
1867                                         i2d_X509_NAME(name,&p);
1868                                         n+=2+j;
1869                                         nl+=2+j;
1870                                         }
1871                                 else
1872                                         {
1873                                         d=p;
1874                                         i2d_X509_NAME(name,&p);
1875                                         j-=2; s2n(j,d); j+=2;
1876                                         n+=j;
1877                                         nl+=j;
1878                                         }
1879                                 }
1880                         }
1881                 /* else no CA names */
1882                 p=(unsigned char *)&(buf->data[4+off]);
1883                 s2n(nl,p);
1884
1885                 d=(unsigned char *)buf->data;
1886                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1887                 l2n3(n,d);
1888
1889                 /* we should now have things packed up, so lets send
1890                  * it off */
1891
1892                 s->init_num=n+4;
1893                 s->init_off=0;
1894 #ifdef NETSCAPE_HANG_BUG
1895                 p=(unsigned char *)s->init_buf->data + s->init_num;
1896
1897                 /* do the header */
1898                 *(p++)=SSL3_MT_SERVER_DONE;
1899                 *(p++)=0;
1900                 *(p++)=0;
1901                 *(p++)=0;
1902                 s->init_num += 4;
1903 #endif
1904
1905                 s->state = SSL3_ST_SW_CERT_REQ_B;
1906                 }
1907
1908         /* SSL3_ST_SW_CERT_REQ_B */
1909         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1910 err:
1911         return(-1);
1912         }
1913
1914 int ssl3_get_client_key_exchange(SSL *s)
1915         {
1916         int i,al,ok;
1917         long n;
1918         unsigned long alg_k;
1919         unsigned char *p;
1920 #ifndef OPENSSL_NO_RSA
1921         RSA *rsa=NULL;
1922         EVP_PKEY *pkey=NULL;
1923 #endif
1924 #ifndef OPENSSL_NO_DH
1925         BIGNUM *pub=NULL;
1926         DH *dh_srvr;
1927 #endif
1928 #ifndef OPENSSL_NO_KRB5
1929         KSSL_ERR kssl_err;
1930 #endif /* OPENSSL_NO_KRB5 */
1931
1932 #ifndef OPENSSL_NO_ECDH
1933         EC_KEY *srvr_ecdh = NULL;
1934         EVP_PKEY *clnt_pub_pkey = NULL;
1935         EC_POINT *clnt_ecpoint = NULL;
1936         BN_CTX *bn_ctx = NULL; 
1937 #endif
1938
1939         n=s->method->ssl_get_message(s,
1940                 SSL3_ST_SR_KEY_EXCH_A,
1941                 SSL3_ST_SR_KEY_EXCH_B,
1942                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1943                 2048, /* ??? */
1944                 &ok);
1945
1946         if (!ok) return((int)n);
1947         p=(unsigned char *)s->init_msg;
1948
1949         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1950
1951 #ifndef OPENSSL_NO_RSA
1952         if (alg_k & SSL_kRSA)
1953                 {
1954                 /* FIX THIS UP EAY EAY EAY EAY */
1955                 if (s->s3->tmp.use_rsa_tmp)
1956                         {
1957                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1958                                 rsa=s->cert->rsa_tmp;
1959                         /* Don't do a callback because rsa_tmp should
1960                          * be sent already */
1961                         if (rsa == NULL)
1962                                 {
1963                                 al=SSL_AD_HANDSHAKE_FAILURE;
1964                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1965                                 goto f_err;
1966
1967                                 }
1968                         }
1969                 else
1970                         {
1971                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1972                         if (    (pkey == NULL) ||
1973                                 (pkey->type != EVP_PKEY_RSA) ||
1974                                 (pkey->pkey.rsa == NULL))
1975                                 {
1976                                 al=SSL_AD_HANDSHAKE_FAILURE;
1977                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1978                                 goto f_err;
1979                                 }
1980                         rsa=pkey->pkey.rsa;
1981                         }
1982
1983                 /* TLS and [incidentally] DTLS{0xFEFF} */
1984                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
1985                         {
1986                         n2s(p,i);
1987                         if (n != i+2)
1988                                 {
1989                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1990                                         {
1991                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1992                                         goto err;
1993                                         }
1994                                 else
1995                                         p-=2;
1996                                 }
1997                         else
1998                                 n=i;
1999                         }
2000
2001                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2002
2003                 al = -1;
2004                 
2005                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2006                         {
2007                         al=SSL_AD_DECODE_ERROR;
2008                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2009                         }
2010
2011                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2012                         {
2013                         /* The premaster secret must contain the same version number as the
2014                          * ClientHello to detect version rollback attacks (strangely, the
2015                          * protocol does not offer such protection for DH ciphersuites).
2016                          * However, buggy clients exist that send the negotiated protocol
2017                          * version instead if the server does not support the requested
2018                          * protocol version.
2019                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2020                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2021                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2022                                 {
2023                                 al=SSL_AD_DECODE_ERROR;
2024                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2025
2026                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2027                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2028                                  * number check as a "bad version oracle" -- an alert would
2029                                  * reveal that the plaintext corresponding to some ciphertext
2030                                  * made up by the adversary is properly formatted except
2031                                  * that the version number is wrong.  To avoid such attacks,
2032                                  * we should treat this just like any other decryption error. */
2033                                 }
2034                         }
2035
2036                 if (al != -1)
2037                         {
2038                         /* Some decryption failure -- use random value instead as countermeasure
2039                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2040                          * (see RFC 2246, section 7.4.7.1). */
2041                         ERR_clear_error();
2042                         i = SSL_MAX_MASTER_KEY_LENGTH;
2043                         p[0] = s->client_version >> 8;
2044                         p[1] = s->client_version & 0xff;
2045                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2046                                 goto err;
2047                         }
2048         
2049                 s->session->master_key_length=
2050                         s->method->ssl3_enc->generate_master_secret(s,
2051                                 s->session->master_key,
2052                                 p,i);
2053                 OPENSSL_cleanse(p,i);
2054                 }
2055         else
2056 #endif
2057 #ifndef OPENSSL_NO_DH
2058                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2059                 {
2060                 n2s(p,i);
2061                 if (n != i+2)
2062                         {
2063                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2064                                 {
2065                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2066                                 goto err;
2067                                 }
2068                         else
2069                                 {
2070                                 p-=2;
2071                                 i=(int)n;
2072                                 }
2073                         }
2074
2075                 if (n == 0L) /* the parameters are in the cert */
2076                         {
2077                         al=SSL_AD_HANDSHAKE_FAILURE;
2078                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2079                         goto f_err;
2080                         }
2081                 else
2082                         {
2083                         if (s->s3->tmp.dh == NULL)
2084                                 {
2085                                 al=SSL_AD_HANDSHAKE_FAILURE;
2086                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2087                                 goto f_err;
2088                                 }
2089                         else
2090                                 dh_srvr=s->s3->tmp.dh;
2091                         }
2092
2093                 pub=BN_bin2bn(p,i,NULL);
2094                 if (pub == NULL)
2095                         {
2096                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2097                         goto err;
2098                         }
2099
2100                 i=DH_compute_key(p,pub,dh_srvr);
2101
2102                 if (i <= 0)
2103                         {
2104                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2105                         goto err;
2106                         }
2107
2108                 DH_free(s->s3->tmp.dh);
2109                 s->s3->tmp.dh=NULL;
2110
2111                 BN_clear_free(pub);
2112                 pub=NULL;
2113                 s->session->master_key_length=
2114                         s->method->ssl3_enc->generate_master_secret(s,
2115                                 s->session->master_key,p,i);
2116                 OPENSSL_cleanse(p,i);
2117                 }
2118         else
2119 #endif
2120 #ifndef OPENSSL_NO_KRB5
2121         if (alg_k & SSL_kKRB5)
2122                 {
2123                 krb5_error_code         krb5rc;
2124                 krb5_data               enc_ticket;
2125                 krb5_data               authenticator;
2126                 krb5_data               enc_pms;
2127                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2128                 EVP_CIPHER_CTX          ciph_ctx;
2129                 const EVP_CIPHER        *enc = NULL;
2130                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2131                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2132                                                + EVP_MAX_BLOCK_LENGTH];
2133                 int                  padl, outl;
2134                 krb5_timestamp          authtime = 0;
2135                 krb5_ticket_times       ttimes;
2136
2137                 EVP_CIPHER_CTX_init(&ciph_ctx);
2138
2139                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2140
2141                 n2s(p,i);
2142                 enc_ticket.length = i;
2143
2144                 if (n < (long)(enc_ticket.length + 6))
2145                         {
2146                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2147                                 SSL_R_DATA_LENGTH_TOO_LONG);
2148                         goto err;
2149                         }
2150
2151                 enc_ticket.data = (char *)p;
2152                 p+=enc_ticket.length;
2153
2154                 n2s(p,i);
2155                 authenticator.length = i;
2156
2157                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2158                         {
2159                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2160                                 SSL_R_DATA_LENGTH_TOO_LONG);
2161                         goto err;
2162                         }
2163
2164                 authenticator.data = (char *)p;
2165                 p+=authenticator.length;
2166
2167                 n2s(p,i);
2168                 enc_pms.length = i;
2169                 enc_pms.data = (char *)p;
2170                 p+=enc_pms.length;
2171
2172                 /* Note that the length is checked again below,
2173                 ** after decryption
2174                 */
2175                 if(enc_pms.length > sizeof pms)
2176                         {
2177                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2178                                SSL_R_DATA_LENGTH_TOO_LONG);
2179                         goto err;
2180                         }
2181
2182                 if (n != (long)(enc_ticket.length + authenticator.length +
2183                                                 enc_pms.length + 6))
2184                         {
2185                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2186                                 SSL_R_DATA_LENGTH_TOO_LONG);
2187                         goto err;
2188                         }
2189
2190                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2191                                         &kssl_err)) != 0)
2192                         {
2193 #ifdef KSSL_DEBUG
2194                         printf("kssl_sget_tkt rtn %d [%d]\n",
2195                                 krb5rc, kssl_err.reason);
2196                         if (kssl_err.text)
2197                                 printf("kssl_err text= %s\n", kssl_err.text);
2198 #endif  /* KSSL_DEBUG */
2199                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2200                                 kssl_err.reason);
2201                         goto err;
2202                         }
2203
2204                 /*  Note: no authenticator is not considered an error,
2205                 **  but will return authtime == 0.
2206                 */
2207                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2208                                         &authtime, &kssl_err)) != 0)
2209                         {
2210 #ifdef KSSL_DEBUG
2211                         printf("kssl_check_authent rtn %d [%d]\n",
2212                                 krb5rc, kssl_err.reason);
2213                         if (kssl_err.text)
2214                                 printf("kssl_err text= %s\n", kssl_err.text);
2215 #endif  /* KSSL_DEBUG */
2216                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2217                                 kssl_err.reason);
2218                         goto err;
2219                         }
2220
2221                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2222                         {
2223                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2224                         goto err;
2225                         }
2226
2227 #ifdef KSSL_DEBUG
2228                 kssl_ctx_show(kssl_ctx);
2229 #endif  /* KSSL_DEBUG */
2230
2231                 enc = kssl_map_enc(kssl_ctx->enctype);
2232                 if (enc == NULL)
2233                     goto err;
2234
2235                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2236
2237                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2238                         {
2239                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2240                                 SSL_R_DECRYPTION_FAILED);
2241                         goto err;
2242                         }
2243                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2244                                         (unsigned char *)enc_pms.data, enc_pms.length))
2245                         {
2246                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2247                                 SSL_R_DECRYPTION_FAILED);
2248                         goto err;
2249                         }
2250                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2251                         {
2252                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2253                                 SSL_R_DATA_LENGTH_TOO_LONG);
2254                         goto err;
2255                         }
2256                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2257                         {
2258                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2259                                 SSL_R_DECRYPTION_FAILED);
2260                         goto err;
2261                         }
2262                 outl += padl;
2263                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2264                         {
2265                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2266                                 SSL_R_DATA_LENGTH_TOO_LONG);
2267                         goto err;
2268                         }
2269                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2270                     {
2271                     /* The premaster secret must contain the same version number as the
2272                      * ClientHello to detect version rollback attacks (strangely, the
2273                      * protocol does not offer such protection for DH ciphersuites).
2274                      * However, buggy clients exist that send random bytes instead of
2275                      * the protocol version.
2276                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2277                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2278                      */
2279                     if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2280                            (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2281                         {
2282                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2283                                SSL_AD_DECODE_ERROR);
2284                         goto err;
2285                         }
2286                     }
2287
2288                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2289
2290                 s->session->master_key_length=
2291                         s->method->ssl3_enc->generate_master_secret(s,
2292                                 s->session->master_key, pms, outl);
2293
2294                 if (kssl_ctx->client_princ)
2295                         {
2296                         size_t len = strlen(kssl_ctx->client_princ);
2297                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2298                                 {
2299                                 s->session->krb5_client_princ_len = len;
2300                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2301                                 }
2302                         }
2303
2304
2305                 /*  Was doing kssl_ctx_free() here,
2306                 **  but it caused problems for apache.
2307                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2308                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2309                 */
2310                 }
2311         else
2312 #endif  /* OPENSSL_NO_KRB5 */
2313
2314 #ifndef OPENSSL_NO_ECDH
2315                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2316                 {
2317                 int ret = 1;
2318                 int field_size = 0;
2319                 const EC_KEY   *tkey;
2320                 const EC_GROUP *group;
2321                 const BIGNUM *priv_key;
2322
2323                 /* initialize structures for server's ECDH key pair */
2324                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2325                         {
2326                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2327                             ERR_R_MALLOC_FAILURE);
2328                         goto err;
2329                         }
2330
2331                 /* Let's get server private key and group information */
2332                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2333                         { 
2334                         /* use the certificate */
2335                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2336                         }
2337                 else
2338                         {
2339                         /* use the ephermeral values we saved when
2340                          * generating the ServerKeyExchange msg.
2341                          */
2342                         tkey = s->s3->tmp.ecdh;
2343                         }
2344
2345                 group    = EC_KEY_get0_group(tkey);
2346                 priv_key = EC_KEY_get0_private_key(tkey);
2347
2348                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2349                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2350                         {
2351                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2352                                ERR_R_EC_LIB);
2353                         goto err;
2354                         }
2355
2356                 /* Let's get client's public key */
2357                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2358                         {
2359                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2360                             ERR_R_MALLOC_FAILURE);
2361                         goto err;
2362                         }
2363
2364                 if (n == 0L) 
2365                         {
2366                         /* Client Publickey was in Client Certificate */
2367
2368                          if (alg_k & SSL_kEECDH)
2369                                  {
2370                                  al=SSL_AD_HANDSHAKE_FAILURE;
2371                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2372                                  goto f_err;
2373                                  }
2374                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2375                             == NULL) || 
2376                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2377                                 {
2378                                 /* XXX: For now, we do not support client
2379                                  * authentication using ECDH certificates
2380                                  * so this branch (n == 0L) of the code is
2381                                  * never executed. When that support is
2382                                  * added, we ought to ensure the key 
2383                                  * received in the certificate is 
2384                                  * authorized for key agreement.
2385                                  * ECDH_compute_key implicitly checks that
2386                                  * the two ECDH shares are for the same
2387                                  * group.
2388                                  */
2389                                 al=SSL_AD_HANDSHAKE_FAILURE;
2390                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2391                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2392                                 goto f_err;
2393                                 }
2394
2395                         if (EC_POINT_copy(clnt_ecpoint,
2396                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2397                                 {
2398                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2399                                         ERR_R_EC_LIB);
2400                                 goto err;
2401                                 }
2402                         ret = 2; /* Skip certificate verify processing */
2403                         }
2404                 else
2405                         {
2406                         /* Get client's public key from encoded point
2407                          * in the ClientKeyExchange message.
2408                          */
2409                         if ((bn_ctx = BN_CTX_new()) == NULL)
2410                                 {
2411                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2412                                     ERR_R_MALLOC_FAILURE);
2413                                 goto err;
2414                                 }
2415
2416                         /* Get encoded point length */
2417                         i = *p; 
2418                         p += 1;
2419                         if (EC_POINT_oct2point(group, 
2420                             clnt_ecpoint, p, i, bn_ctx) == 0)
2421                                 {
2422                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2423                                     ERR_R_EC_LIB);
2424                                 goto err;
2425                                 }
2426                         /* p is pointing to somewhere in the buffer
2427                          * currently, so set it to the start 
2428                          */ 
2429                         p=(unsigned char *)s->init_buf->data;
2430                         }
2431
2432                 /* Compute the shared pre-master secret */
2433                 field_size = EC_GROUP_get_degree(group);
2434                 if (field_size <= 0)
2435                         {
2436                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2437                                ERR_R_ECDH_LIB);
2438                         goto err;
2439                         }
2440                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2441                 if (i <= 0)
2442                         {
2443                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2444                             ERR_R_ECDH_LIB);
2445                         goto err;
2446                         }
2447
2448                 EVP_PKEY_free(clnt_pub_pkey);
2449                 EC_POINT_free(clnt_ecpoint);
2450                 EC_KEY_free(srvr_ecdh);
2451                 BN_CTX_free(bn_ctx);
2452                 EC_KEY_free(s->s3->tmp.ecdh);
2453                 s->s3->tmp.ecdh = NULL; 
2454
2455                 /* Compute the master secret */
2456                 s->session->master_key_length = s->method->ssl3_enc-> \
2457                     generate_master_secret(s, s->session->master_key, p, i);
2458                 
2459                 OPENSSL_cleanse(p, i);
2460                 return (ret);
2461                 }
2462         else
2463 #endif
2464 #ifndef OPENSSL_NO_PSK
2465                 if (alg_k & SSL_kPSK)
2466                         {
2467                         unsigned char *t = NULL;
2468                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2469                         unsigned int pre_ms_len = 0, psk_len = 0;
2470                         int psk_err = 1;
2471                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2472
2473                         al=SSL_AD_HANDSHAKE_FAILURE;
2474
2475                         n2s(p,i);
2476                         if (n != i+2)
2477                                 {
2478                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2479                                         SSL_R_LENGTH_MISMATCH);
2480                                 goto psk_err;
2481                                 }
2482                         if (i > PSK_MAX_IDENTITY_LEN)
2483                                 {
2484                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2485                                         SSL_R_DATA_LENGTH_TOO_LONG);
2486                                 goto psk_err;
2487                                 }
2488                         if (s->psk_server_callback == NULL)
2489                                 {
2490                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2491                                        SSL_R_PSK_NO_SERVER_CB);
2492                                 goto psk_err;
2493                                 }
2494
2495                         /* Create guaranteed NULL-terminated identity
2496                          * string for the callback */
2497                         memcpy(tmp_id, p, i);
2498                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2499                         psk_len = s->psk_server_callback(s, tmp_id,
2500                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2501                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2502
2503                         if (psk_len > PSK_MAX_PSK_LEN)
2504                                 {
2505                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2506                                         ERR_R_INTERNAL_ERROR);
2507                                 goto psk_err;
2508                                 }
2509                         else if (psk_len == 0)
2510                                 {
2511                                 /* PSK related to the given identity not found */
2512                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2513                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2514                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2515                                 goto psk_err;
2516                                 }
2517
2518                         /* create PSK pre_master_secret */
2519                         pre_ms_len=2+psk_len+2+psk_len;
2520                         t = psk_or_pre_ms;
2521                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2522                         s2n(psk_len, t);
2523                         memset(t, 0, psk_len);
2524                         t+=psk_len;
2525                         s2n(psk_len, t);
2526
2527                         if (s->session->psk_identity != NULL)
2528                                 OPENSSL_free(s->session->psk_identity);
2529                         s->session->psk_identity = BUF_strdup((char *)p);
2530                         if (s->session->psk_identity == NULL)
2531                                 {
2532                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2533                                         ERR_R_MALLOC_FAILURE);
2534                                 goto psk_err;
2535                                 }
2536
2537                         if (s->session->psk_identity_hint != NULL)
2538                                 OPENSSL_free(s->session->psk_identity_hint);
2539                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2540                         if (s->ctx->psk_identity_hint != NULL &&
2541                                 s->session->psk_identity_hint == NULL)
2542                                 {
2543                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2544                                         ERR_R_MALLOC_FAILURE);
2545                                 goto psk_err;
2546                                 }
2547
2548                         s->session->master_key_length=
2549                                 s->method->ssl3_enc->generate_master_secret(s,
2550                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2551                         psk_err = 0;
2552                 psk_err:
2553                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2554                         if (psk_err != 0)
2555                                 goto f_err;
2556                         }
2557                 else
2558 #endif
2559                 if (alg_k & SSL_kGOST) 
2560                         {
2561                         int ret = 0;
2562                         EVP_PKEY_CTX *pkey_ctx;
2563                         EVP_PKEY *client_pub_pkey = NULL;
2564                         unsigned char premaster_secret[32], *start;
2565                         size_t outlen=32, inlen;                        
2566
2567                         /* Get our certificate private key*/
2568                         pkey_ctx = EVP_PKEY_CTX_new(s->cert->key->privatekey,NULL);     
2569                         EVP_PKEY_decrypt_init(pkey_ctx);
2570                         /* If client certificate is present and is of the same type, maybe
2571                          * use it for key exchange.  Don't mind errors from
2572                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2573                          * a client certificate for authorization only. */
2574                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2575                         if (client_pub_pkey)
2576                                 {
2577                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2578                                         ERR_clear_error();
2579                                 }
2580                         /* Decrypt session key */
2581                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2582                                 {
2583                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2584                                 goto gerr;
2585                                 }
2586                         if (p[1] == 0x81)
2587                                 {
2588                                 start = p+3;
2589                                 inlen = p[2];
2590                                 }
2591                         else if (p[1] < 0x80)
2592                                 {
2593                                 start = p+2;
2594                                 inlen = p[1];
2595                                 }
2596                         else
2597                                 {
2598                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2599                                 goto gerr;
2600                                 }
2601                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2602
2603                                 {
2604                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2605                                 goto gerr;
2606                                 }
2607                         /* Generate master secret */
2608                         s->session->master_key_length=
2609                                 s->method->ssl3_enc->generate_master_secret(s,
2610                                         s->session->master_key,premaster_secret,32);
2611                         /* Check if pubkey from client certificate was used */
2612                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2613                                 ret = 2;
2614                         else
2615                                 ret = 1;
2616                 gerr:
2617                         EVP_PKEY_free(client_pub_pkey);
2618                         EVP_PKEY_CTX_free(pkey_ctx);
2619                         if (ret)
2620                                 return ret;
2621                         else
2622                                 goto err;
2623                         }
2624                 else
2625                 {
2626                 al=SSL_AD_HANDSHAKE_FAILURE;
2627                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2628                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2629                 goto f_err;
2630                 }
2631
2632         return(1);
2633 f_err:
2634         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2635 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2636 err:
2637 #endif
2638 #ifndef OPENSSL_NO_ECDH
2639         EVP_PKEY_free(clnt_pub_pkey);
2640         EC_POINT_free(clnt_ecpoint);
2641         if (srvr_ecdh != NULL) 
2642                 EC_KEY_free(srvr_ecdh);
2643         BN_CTX_free(bn_ctx);
2644 #endif
2645         return(-1);
2646         }
2647
2648 int ssl3_get_cert_verify(SSL *s)
2649         {
2650         EVP_PKEY *pkey=NULL;
2651         unsigned char *p;
2652         int al,ok,ret=0;
2653         long n;
2654         int type=0,i,j;
2655         X509 *peer;
2656
2657         n=s->method->ssl_get_message(s,
2658                 SSL3_ST_SR_CERT_VRFY_A,
2659                 SSL3_ST_SR_CERT_VRFY_B,
2660                 -1,
2661                 514, /* 514? */
2662                 &ok);
2663
2664         if (!ok) return((int)n);
2665
2666         if (s->session->peer != NULL)
2667                 {
2668                 peer=s->session->peer;
2669                 pkey=X509_get_pubkey(peer);
2670                 type=X509_certificate_type(peer,pkey);
2671                 }
2672         else
2673                 {
2674                 peer=NULL;
2675                 pkey=NULL;
2676                 }
2677
2678         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2679                 {
2680                 s->s3->tmp.reuse_message=1;
2681                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2682                         {
2683                         al=SSL_AD_UNEXPECTED_MESSAGE;
2684                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2685                         goto f_err;
2686                         }
2687                 ret=1;
2688                 goto end;
2689                 }
2690
2691         if (peer == NULL)
2692                 {
2693                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2694                 al=SSL_AD_UNEXPECTED_MESSAGE;
2695                 goto f_err;
2696                 }
2697
2698         if (!(type & EVP_PKT_SIGN))
2699                 {
2700                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2701                 al=SSL_AD_ILLEGAL_PARAMETER;
2702                 goto f_err;
2703                 }
2704
2705         if (s->s3->change_cipher_spec)
2706                 {
2707                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2708                 al=SSL_AD_UNEXPECTED_MESSAGE;
2709                 goto f_err;
2710                 }
2711
2712         /* we now have a signature that we need to verify */
2713         p=(unsigned char *)s->init_msg;
2714         /* Check for broken implementations of GOST ciphersuites */
2715         /* If key is GOST and n is exactly 64, it is bare
2716          * signature without length field */
2717         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2718                 pkey->type == NID_id_GostR3410_2001) )
2719                 {
2720                 i=64;
2721                 } 
2722         else 
2723                 {       
2724                 n2s(p,i);
2725                 n-=2;
2726                 if (i > n)
2727                         {
2728                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2729                         al=SSL_AD_DECODE_ERROR;
2730                         goto f_err;
2731                         }
2732         }
2733         j=EVP_PKEY_size(pkey);
2734         if ((i > j) || (n > j) || (n <= 0))
2735                 {
2736                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2737                 al=SSL_AD_DECODE_ERROR;
2738                 goto f_err;
2739                 }
2740
2741 #ifndef OPENSSL_NO_RSA 
2742         if (pkey->type == EVP_PKEY_RSA)
2743                 {
2744                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2745                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
2746                                                         pkey->pkey.rsa);
2747                 if (i < 0)
2748                         {
2749                         al=SSL_AD_DECRYPT_ERROR;
2750                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2751                         goto f_err;
2752                         }
2753                 if (i == 0)
2754                         {
2755                         al=SSL_AD_DECRYPT_ERROR;
2756                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2757                         goto f_err;
2758                         }
2759                 }
2760         else
2761 #endif
2762 #ifndef OPENSSL_NO_DSA
2763                 if (pkey->type == EVP_PKEY_DSA)
2764                 {
2765                 j=DSA_verify(pkey->save_type,
2766                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2767                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2768                 if (j <= 0)
2769                         {
2770                         /* bad signature */
2771                         al=SSL_AD_DECRYPT_ERROR;
2772                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2773                         goto f_err;
2774                         }
2775                 }
2776         else
2777 #endif
2778 #ifndef OPENSSL_NO_ECDSA
2779                 if (pkey->type == EVP_PKEY_EC)
2780                 {
2781                 j=ECDSA_verify(pkey->save_type,
2782                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2783                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2784                 if (j <= 0)
2785                         {
2786                         /* bad signature */
2787                         al=SSL_AD_DECRYPT_ERROR;
2788                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2789                             SSL_R_BAD_ECDSA_SIGNATURE);
2790                         goto f_err;
2791                         }
2792                 }
2793         else
2794 #endif
2795         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2796                 {   unsigned char signature[64];
2797                         int idx;
2798                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2799                         EVP_PKEY_verify_init(pctx);
2800                         if (i!=64) {
2801                                 fprintf(stderr,"GOST signature length is %d",i);
2802                         }       
2803                         for (idx=0;idx<64;idx++) {
2804                                 signature[63-idx]=p[idx];
2805                         }       
2806                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2807                         EVP_PKEY_CTX_free(pctx);
2808                         if (j<=0) 
2809                                 {
2810                                 al=SSL_AD_DECRYPT_ERROR;
2811                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2812                                         SSL_R_BAD_ECDSA_SIGNATURE);
2813                                 goto f_err;
2814                                 }       
2815                 }
2816         else    
2817                 {
2818                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2819                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2820                 goto f_err;
2821                 }
2822
2823
2824         ret=1;
2825         if (0)
2826                 {
2827 f_err:
2828                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2829                 }
2830 end:
2831         EVP_PKEY_free(pkey);
2832         return(ret);
2833         }
2834
2835 int ssl3_get_client_certificate(SSL *s)
2836         {
2837         int i,ok,al,ret= -1;
2838         X509 *x=NULL;
2839         unsigned long l,nc,llen,n;
2840         const unsigned char *p,*q;
2841         unsigned char *d;
2842         STACK_OF(X509) *sk=NULL;
2843
2844         n=s->method->ssl_get_message(s,
2845                 SSL3_ST_SR_CERT_A,
2846                 SSL3_ST_SR_CERT_B,
2847                 -1,
2848                 s->max_cert_list,
2849                 &ok);
2850
2851         if (!ok) return((int)n);
2852
2853         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2854                 {
2855                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2856                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2857                         {
2858                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2859                         al=SSL_AD_HANDSHAKE_FAILURE;
2860                         goto f_err;
2861                         }
2862                 /* If tls asked for a client cert, the client must return a 0 list */
2863                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2864                         {
2865                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2866                         al=SSL_AD_UNEXPECTED_MESSAGE;
2867                         goto f_err;
2868                         }
2869                 s->s3->tmp.reuse_message=1;
2870                 return(1);
2871                 }
2872
2873         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2874                 {
2875                 al=SSL_AD_UNEXPECTED_MESSAGE;
2876                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2877                 goto f_err;
2878                 }
2879         p=d=(unsigned char *)s->init_msg;
2880
2881         if ((sk=sk_X509_new_null()) == NULL)
2882                 {
2883                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2884                 goto err;
2885                 }
2886
2887         n2l3(p,llen);
2888         if (llen+3 != n)
2889                 {
2890                 al=SSL_AD_DECODE_ERROR;
2891                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2892                 goto f_err;
2893                 }
2894         for (nc=0; nc<llen; )
2895                 {
2896                 n2l3(p,l);
2897                 if ((l+nc+3) > llen)
2898                         {
2899                         al=SSL_AD_DECODE_ERROR;
2900                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2901                         goto f_err;
2902                         }
2903
2904                 q=p;
2905                 x=d2i_X509(NULL,&p,l);
2906                 if (x == NULL)
2907                         {
2908                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2909                         goto err;
2910                         }
2911                 if (p != (q+l))
2912                         {
2913                         al=SSL_AD_DECODE_ERROR;
2914                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2915                         goto f_err;
2916                         }
2917                 if (!sk_X509_push(sk,x))
2918                         {
2919                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2920                         goto err;
2921                         }
2922                 x=NULL;
2923                 nc+=l+3;
2924                 }
2925
2926         if (sk_X509_num(sk) <= 0)
2927                 {
2928                 /* TLS does not mind 0 certs returned */
2929                 if (s->version == SSL3_VERSION)
2930                         {
2931                         al=SSL_AD_HANDSHAKE_FAILURE;
2932                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2933                         goto f_err;
2934                         }
2935                 /* Fail for TLS only if we required a certificate */
2936                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2937                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2938                         {
2939                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2940                         al=SSL_AD_HANDSHAKE_FAILURE;
2941                         goto f_err;
2942                         }
2943                 }
2944         else
2945                 {
2946                 i=ssl_verify_cert_chain(s,sk);
2947                 if (i <= 0)
2948                         {
2949                         al=ssl_verify_alarm_type(s->verify_result);
2950                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2951                         goto f_err;
2952                         }
2953                 }
2954
2955         if (s->session->peer != NULL) /* This should not be needed */
2956                 X509_free(s->session->peer);
2957         s->session->peer=sk_X509_shift(sk);
2958         s->session->verify_result = s->verify_result;
2959
2960         /* With the current implementation, sess_cert will always be NULL
2961          * when we arrive here. */
2962         if (s->session->sess_cert == NULL)
2963                 {
2964                 s->session->sess_cert = ssl_sess_cert_new();
2965                 if (s->session->sess_cert == NULL)
2966                         {
2967                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2968                         goto err;
2969                         }
2970                 }
2971         if (s->session->sess_cert->cert_chain != NULL)
2972                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2973         s->session->sess_cert->cert_chain=sk;
2974         /* Inconsistency alert: cert_chain does *not* include the
2975          * peer's own certificate, while we do include it in s3_clnt.c */
2976
2977         sk=NULL;
2978