ef760098b04ec9611546a9760129c35668841390
[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 && s->version != DTLS1_VERSION && s->version != DTLS1_BAD_VER)
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
1085         /* DTLS extensions */
1086         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1087                 {
1088                 if (!ssl_parse_clienthello_dtlsext(s,&p,d,n, &al))
1089                         {
1090                                 /* 'al' set by ssl_parse_clienthello_dtlsext */
1091                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1092                                 goto f_err;
1093                         }
1094                 }
1095 #endif
1096
1097         /* Worst case, we will use the NULL compression, but if we have other
1098          * options, we will now look for them.  We have i-1 compression
1099          * algorithms from the client, starting at q. */
1100         s->s3->tmp.new_compression=NULL;
1101 #ifndef OPENSSL_NO_COMP
1102         if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1103                 { /* See if we have a match */
1104                 int m,nn,o,v,done=0;
1105
1106                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1107                 for (m=0; m<nn; m++)
1108                         {
1109                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1110                         v=comp->id;
1111                         for (o=0; o<i; o++)
1112                                 {
1113                                 if (v == q[o])
1114                                         {
1115                                         done=1;
1116                                         break;
1117                                         }
1118                                 }
1119                         if (done) break;
1120                         }
1121                 if (done)
1122                         s->s3->tmp.new_compression=comp;
1123                 else
1124                         comp=NULL;
1125                 }
1126 #endif
1127
1128         /* Given s->session->ciphers and SSL_get_ciphers, we must
1129          * pick a cipher */
1130
1131         if (!s->hit)
1132                 {
1133 #ifdef OPENSSL_NO_COMP
1134                 s->session->compress_meth=0;
1135 #else
1136                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1137 #endif
1138                 if (s->session->ciphers != NULL)
1139                         sk_SSL_CIPHER_free(s->session->ciphers);
1140                 s->session->ciphers=ciphers;
1141                 if (ciphers == NULL)
1142                         {
1143                         al=SSL_AD_ILLEGAL_PARAMETER;
1144                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1145                         goto f_err;
1146                         }
1147                 ciphers=NULL;
1148                 c=ssl3_choose_cipher(s,s->session->ciphers,
1149                                      SSL_get_ciphers(s));
1150
1151                 if (c == NULL)
1152                         {
1153                         al=SSL_AD_HANDSHAKE_FAILURE;
1154                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1155                         goto f_err;
1156                         }
1157                 s->s3->tmp.new_cipher=c;
1158                 }
1159         else
1160                 {
1161                 /* Session-id reuse */
1162 #ifdef REUSE_CIPHER_BUG
1163                 STACK_OF(SSL_CIPHER) *sk;
1164                 SSL_CIPHER *nc=NULL;
1165                 SSL_CIPHER *ec=NULL;
1166
1167                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1168                         {
1169                         sk=s->session->ciphers;
1170                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1171                                 {
1172                                 c=sk_SSL_CIPHER_value(sk,i);
1173                                 if (c->algorithm_enc & SSL_eNULL)
1174                                         nc=c;
1175                                 if (SSL_C_IS_EXPORT(c))
1176                                         ec=c;
1177                                 }
1178                         if (nc != NULL)
1179                                 s->s3->tmp.new_cipher=nc;
1180                         else if (ec != NULL)
1181                                 s->s3->tmp.new_cipher=ec;
1182                         else
1183                                 s->s3->tmp.new_cipher=s->session->cipher;
1184                         }
1185                 else
1186 #endif
1187                 s->s3->tmp.new_cipher=s->session->cipher;
1188                 }
1189
1190         if (!ssl3_digest_cached_records(s))
1191                 goto f_err;
1192         
1193         /* we now have the following setup. 
1194          * client_random
1195          * cipher_list          - our prefered list of ciphers
1196          * ciphers              - the clients prefered list of ciphers
1197          * compression          - basically ignored right now
1198          * ssl version is set   - sslv3
1199          * s->session           - The ssl session has been setup.
1200          * s->hit               - session reuse flag
1201          * s->tmp.new_cipher    - the new cipher to use.
1202          */
1203
1204         if (ret < 0) ret=1;
1205         if (0)
1206                 {
1207 f_err:
1208                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1209                 }
1210 err:
1211         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1212         return(ret);
1213         }
1214
1215 int ssl3_send_server_hello(SSL *s)
1216         {
1217         unsigned char *buf;
1218         unsigned char *p,*d;
1219         int i,sl;
1220         unsigned long l;
1221 #ifdef OPENSSL_NO_TLSEXT
1222         unsigned long Time;
1223 #endif
1224
1225         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1226                 {
1227                 buf=(unsigned char *)s->init_buf->data;
1228 #ifdef OPENSSL_NO_TLSEXT
1229                 p=s->s3->server_random;
1230                 /* Generate server_random if it was not needed previously */
1231                 Time=(unsigned long)time(NULL);                 /* Time */
1232                 l2n(Time,p);
1233                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1234                         return -1;
1235 #endif
1236                 /* Do the message type and length last */
1237                 d=p= &(buf[4]);
1238
1239                 *(p++)=s->version>>8;
1240                 *(p++)=s->version&0xff;
1241
1242                 /* Random stuff */
1243                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1244                 p+=SSL3_RANDOM_SIZE;
1245
1246                 /* now in theory we have 3 options to sending back the
1247                  * session id.  If it is a re-use, we send back the
1248                  * old session-id, if it is a new session, we send
1249                  * back the new session-id or we send back a 0 length
1250                  * session-id if we want it to be single use.
1251                  * Currently I will not implement the '0' length session-id
1252                  * 12-Jan-98 - I'll now support the '0' length stuff.
1253                  *
1254                  * We also have an additional case where stateless session
1255                  * resumption is successful: we always send back the old
1256                  * session id. In this case s->hit is non zero: this can
1257                  * only happen if stateless session resumption is succesful
1258                  * if session caching is disabled so existing functionality
1259                  * is unaffected.
1260                  */
1261                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1262                         && !s->hit)
1263                         s->session->session_id_length=0;
1264
1265                 sl=s->session->session_id_length;
1266                 if (sl > (int)sizeof(s->session->session_id))
1267                         {
1268                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1269                         return -1;
1270                         }
1271                 *(p++)=sl;
1272                 memcpy(p,s->session->session_id,sl);
1273                 p+=sl;
1274
1275                 /* put the cipher */
1276                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1277                 p+=i;
1278
1279                 /* put the compression method */
1280 #ifdef OPENSSL_NO_COMP
1281                         *(p++)=0;
1282 #else
1283                 if (s->s3->tmp.new_compression == NULL)
1284                         *(p++)=0;
1285                 else
1286                         *(p++)=s->s3->tmp.new_compression->id;
1287 #endif
1288 #ifndef OPENSSL_NO_TLSEXT
1289                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1290                         {
1291                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1292                         return -1;
1293                         }
1294                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1295                         {
1296                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1297                         return -1;
1298                         }
1299 #endif
1300                 /* do the header */
1301                 l=(p-d);
1302                 d=buf;
1303                 *(d++)=SSL3_MT_SERVER_HELLO;
1304                 l2n3(l,d);
1305
1306                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1307                 /* number of bytes to write */
1308                 s->init_num=p-buf;
1309                 s->init_off=0;
1310                 }
1311
1312         /* SSL3_ST_SW_SRVR_HELLO_B */
1313         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1314         }
1315
1316 int ssl3_send_server_done(SSL *s)
1317         {
1318         unsigned char *p;
1319
1320         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1321                 {
1322                 p=(unsigned char *)s->init_buf->data;
1323
1324                 /* do the header */
1325                 *(p++)=SSL3_MT_SERVER_DONE;
1326                 *(p++)=0;
1327                 *(p++)=0;
1328                 *(p++)=0;
1329
1330                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1331                 /* number of bytes to write */
1332                 s->init_num=4;
1333                 s->init_off=0;
1334                 }
1335
1336         /* SSL3_ST_SW_SRVR_DONE_B */
1337         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1338         }
1339
1340 int ssl3_send_server_key_exchange(SSL *s)
1341         {
1342 #ifndef OPENSSL_NO_RSA
1343         unsigned char *q;
1344         int j,num;
1345         RSA *rsa;
1346         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1347         unsigned int u;
1348 #endif
1349 #ifndef OPENSSL_NO_DH
1350         DH *dh=NULL,*dhp;
1351 #endif
1352 #ifndef OPENSSL_NO_ECDH
1353         EC_KEY *ecdh=NULL, *ecdhp;
1354         unsigned char *encodedPoint = NULL;
1355         int encodedlen = 0;
1356         int curve_id = 0;
1357         BN_CTX *bn_ctx = NULL; 
1358 #endif
1359         EVP_PKEY *pkey;
1360         unsigned char *p,*d;
1361         int al,i;
1362         unsigned long type;
1363         int n;
1364         CERT *cert;
1365         BIGNUM *r[4];
1366         int nr[4],kn;
1367         BUF_MEM *buf;
1368         EVP_MD_CTX md_ctx;
1369
1370         EVP_MD_CTX_init(&md_ctx);
1371         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1372                 {
1373                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1374                 cert=s->cert;
1375
1376                 buf=s->init_buf;
1377
1378                 r[0]=r[1]=r[2]=r[3]=NULL;
1379                 n=0;
1380 #ifndef OPENSSL_NO_RSA
1381                 if (type & SSL_kRSA)
1382                         {
1383                         rsa=cert->rsa_tmp;
1384                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1385                                 {
1386                                 rsa=s->cert->rsa_tmp_cb(s,
1387                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1388                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1389                                 if(rsa == NULL)
1390                                 {
1391                                         al=SSL_AD_HANDSHAKE_FAILURE;
1392                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1393                                         goto f_err;
1394                                 }
1395                                 RSA_up_ref(rsa);
1396                                 cert->rsa_tmp=rsa;
1397                                 }
1398                         if (rsa == NULL)
1399                                 {
1400                                 al=SSL_AD_HANDSHAKE_FAILURE;
1401                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1402                                 goto f_err;
1403                                 }
1404                         r[0]=rsa->n;
1405                         r[1]=rsa->e;
1406                         s->s3->tmp.use_rsa_tmp=1;
1407                         }
1408                 else
1409 #endif
1410 #ifndef OPENSSL_NO_DH
1411                         if (type & SSL_kEDH)
1412                         {
1413                         dhp=cert->dh_tmp;
1414                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1415                                 dhp=s->cert->dh_tmp_cb(s,
1416                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1417                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1418                         if (dhp == NULL)
1419                                 {
1420                                 al=SSL_AD_HANDSHAKE_FAILURE;
1421                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1422                                 goto f_err;
1423                                 }
1424
1425                         if (s->s3->tmp.dh != NULL)
1426                                 {
1427                                 DH_free(dh);
1428                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1429                                 goto err;
1430                                 }
1431
1432                         if ((dh=DHparams_dup(dhp)) == NULL)
1433                                 {
1434                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1435                                 goto err;
1436                                 }
1437
1438                         s->s3->tmp.dh=dh;
1439                         if ((dhp->pub_key == NULL ||
1440                              dhp->priv_key == NULL ||
1441                              (s->options & SSL_OP_SINGLE_DH_USE)))
1442                                 {
1443                                 if(!DH_generate_key(dh))
1444                                     {
1445                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1446                                            ERR_R_DH_LIB);
1447                                     goto err;
1448                                     }
1449                                 }
1450                         else
1451                                 {
1452                                 dh->pub_key=BN_dup(dhp->pub_key);
1453                                 dh->priv_key=BN_dup(dhp->priv_key);
1454                                 if ((dh->pub_key == NULL) ||
1455                                         (dh->priv_key == NULL))
1456                                         {
1457                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1458                                         goto err;
1459                                         }
1460                                 }
1461                         r[0]=dh->p;
1462                         r[1]=dh->g;
1463                         r[2]=dh->pub_key;
1464                         }
1465                 else 
1466 #endif
1467 #ifndef OPENSSL_NO_ECDH
1468                         if (type & SSL_kEECDH)
1469                         {
1470                         const EC_GROUP *group;
1471
1472                         ecdhp=cert->ecdh_tmp;
1473                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1474                                 {
1475                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1476                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1477                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1478                                 }
1479                         if (ecdhp == NULL)
1480                                 {
1481                                 al=SSL_AD_HANDSHAKE_FAILURE;
1482                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1483                                 goto f_err;
1484                                 }
1485
1486                         if (s->s3->tmp.ecdh != NULL)
1487                                 {
1488                                 EC_KEY_free(s->s3->tmp.ecdh); 
1489                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1490                                 goto err;
1491                                 }
1492
1493                         /* Duplicate the ECDH structure. */
1494                         if (ecdhp == NULL)
1495                                 {
1496                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1497                                 goto err;
1498                                 }
1499                         if (!EC_KEY_up_ref(ecdhp))
1500                                 {
1501                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1502                                 goto err;
1503                                 }
1504                         ecdh = ecdhp;
1505
1506                         s->s3->tmp.ecdh=ecdh;
1507                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1508                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1509                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1510                                 {
1511                                 if(!EC_KEY_generate_key(ecdh))
1512                                     {
1513                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1514                                     goto err;
1515                                     }
1516                                 }
1517
1518                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1519                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1520                             (EC_KEY_get0_private_key(ecdh) == NULL))
1521                                 {
1522                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1523                                 goto err;
1524                                 }
1525
1526                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1527                             (EC_GROUP_get_degree(group) > 163)) 
1528                                 {
1529                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1530                                 goto err;
1531                                 }
1532
1533                         /* XXX: For now, we only support ephemeral ECDH
1534                          * keys over named (not generic) curves. For 
1535                          * supported named curves, curve_id is non-zero.
1536                          */
1537                         if ((curve_id = 
1538                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1539                             == 0)
1540                                 {
1541                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1542                                 goto err;
1543                                 }
1544
1545                         /* Encode the public key.
1546                          * First check the size of encoding and
1547                          * allocate memory accordingly.
1548                          */
1549                         encodedlen = EC_POINT_point2oct(group, 
1550                             EC_KEY_get0_public_key(ecdh),
1551                             POINT_CONVERSION_UNCOMPRESSED, 
1552                             NULL, 0, NULL);
1553
1554                         encodedPoint = (unsigned char *) 
1555                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1556                         bn_ctx = BN_CTX_new();
1557                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1558                                 {
1559                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1560                                 goto err;
1561                                 }
1562
1563
1564                         encodedlen = EC_POINT_point2oct(group, 
1565                             EC_KEY_get0_public_key(ecdh), 
1566                             POINT_CONVERSION_UNCOMPRESSED, 
1567                             encodedPoint, encodedlen, bn_ctx);
1568
1569                         if (encodedlen == 0) 
1570                                 {
1571                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1572                                 goto err;
1573                                 }
1574
1575                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1576
1577                         /* XXX: For now, we only support named (not 
1578                          * generic) curves in ECDH ephemeral key exchanges.
1579                          * In this situation, we need four additional bytes
1580                          * to encode the entire ServerECDHParams
1581                          * structure. 
1582                          */
1583                         n = 4 + encodedlen;
1584
1585                         /* We'll generate the serverKeyExchange message
1586                          * explicitly so we can set these to NULLs
1587                          */
1588                         r[0]=NULL;
1589                         r[1]=NULL;
1590                         r[2]=NULL;
1591                         r[3]=NULL;
1592                         }
1593                 else 
1594 #endif /* !OPENSSL_NO_ECDH */
1595 #ifndef OPENSSL_NO_PSK
1596                         if (type & SSL_kPSK)
1597                                 {
1598                                 /* reserve size for record length and PSK identity hint*/
1599                                 n+=2+strlen(s->ctx->psk_identity_hint);
1600                                 }
1601                         else
1602 #endif /* !OPENSSL_NO_PSK */
1603                         {
1604                         al=SSL_AD_HANDSHAKE_FAILURE;
1605                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1606                         goto f_err;
1607                         }
1608                 for (i=0; r[i] != NULL; i++)
1609                         {
1610                         nr[i]=BN_num_bytes(r[i]);
1611                         n+=2+nr[i];
1612                         }
1613
1614                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1615                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1616                         {
1617                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1618                                 == NULL)
1619                                 {
1620                                 al=SSL_AD_DECODE_ERROR;
1621                                 goto f_err;
1622                                 }
1623                         kn=EVP_PKEY_size(pkey);
1624                         }
1625                 else
1626                         {
1627                         pkey=NULL;
1628                         kn=0;
1629                         }
1630
1631                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1632                         {
1633                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1634                         goto err;
1635                         }
1636                 d=(unsigned char *)s->init_buf->data;
1637                 p= &(d[4]);
1638
1639                 for (i=0; r[i] != NULL; i++)
1640                         {
1641                         s2n(nr[i],p);
1642                         BN_bn2bin(r[i],p);
1643                         p+=nr[i];
1644                         }
1645
1646 #ifndef OPENSSL_NO_ECDH
1647                 if (type & SSL_kEECDH) 
1648                         {
1649                         /* XXX: For now, we only support named (not generic) curves.
1650                          * In this situation, the serverKeyExchange message has:
1651                          * [1 byte CurveType], [2 byte CurveName]
1652                          * [1 byte length of encoded point], followed by
1653                          * the actual encoded point itself
1654                          */
1655                         *p = NAMED_CURVE_TYPE;
1656                         p += 1;
1657                         *p = 0;
1658                         p += 1;
1659                         *p = curve_id;
1660                         p += 1;
1661                         *p = encodedlen;
1662                         p += 1;
1663                         memcpy((unsigned char*)p, 
1664                             (unsigned char *)encodedPoint, 
1665                             encodedlen);
1666                         OPENSSL_free(encodedPoint);
1667                         p += encodedlen;
1668                         }
1669 #endif
1670
1671 #ifndef OPENSSL_NO_PSK
1672                 if (type & SSL_kPSK)
1673                         {
1674                         /* copy PSK identity hint */
1675                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1676                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1677                         p+=strlen(s->ctx->psk_identity_hint);
1678                         }
1679 #endif
1680
1681                 /* not anonymous */
1682                 if (pkey != NULL)
1683                         {
1684                         /* n is the length of the params, they start at &(d[4])
1685                          * and p points to the space at the end. */
1686 #ifndef OPENSSL_NO_RSA
1687                         if (pkey->type == EVP_PKEY_RSA)
1688                                 {
1689                                 q=md_buf;
1690                                 j=0;
1691                                 for (num=2; num > 0; num--)
1692                                         {
1693                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1694                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1695                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1696                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1697                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1698                                         EVP_DigestFinal_ex(&md_ctx,q,
1699                                                 (unsigned int *)&i);
1700                                         q+=i;
1701                                         j+=i;
1702                                         }
1703                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1704                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1705                                         {
1706                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1707                                         goto err;
1708                                         }
1709                                 s2n(u,p);
1710                                 n+=u+2;
1711                                 }
1712                         else
1713 #endif
1714 #if !defined(OPENSSL_NO_DSA)
1715                                 if (pkey->type == EVP_PKEY_DSA)
1716                                 {
1717                                 /* lets do DSS */
1718                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1719                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1720                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1721                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1722                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1723                                         (unsigned int *)&i,pkey))
1724                                         {
1725                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1726                                         goto err;
1727                                         }
1728                                 s2n(i,p);
1729                                 n+=i+2;
1730                                 }
1731                         else
1732 #endif
1733 #if !defined(OPENSSL_NO_ECDSA)
1734                                 if (pkey->type == EVP_PKEY_EC)
1735                                 {
1736                                 /* let's do ECDSA */
1737                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1738                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1739                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1740                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1741                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1742                                         (unsigned int *)&i,pkey))
1743                                         {
1744                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1745                                         goto err;
1746                                         }
1747                                 s2n(i,p);
1748                                 n+=i+2;
1749                                 }
1750                         else
1751 #endif
1752                                 {
1753                                 /* Is this error check actually needed? */
1754                                 al=SSL_AD_HANDSHAKE_FAILURE;
1755                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1756                                 goto f_err;
1757                                 }
1758                         }
1759
1760                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1761                 l2n3(n,d);
1762
1763                 /* we should now have things packed up, so lets send
1764                  * it off */
1765                 s->init_num=n+4;
1766                 s->init_off=0;
1767                 }
1768
1769         s->state = SSL3_ST_SW_KEY_EXCH_B;
1770         EVP_MD_CTX_cleanup(&md_ctx);
1771         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1772 f_err:
1773         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1774 err:
1775 #ifndef OPENSSL_NO_ECDH
1776         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1777         BN_CTX_free(bn_ctx);
1778 #endif
1779         EVP_MD_CTX_cleanup(&md_ctx);
1780         return(-1);
1781         }
1782
1783 int ssl3_send_certificate_request(SSL *s)
1784         {
1785         unsigned char *p,*d;
1786         int i,j,nl,off,n;
1787         STACK_OF(X509_NAME) *sk=NULL;
1788         X509_NAME *name;
1789         BUF_MEM *buf;
1790
1791         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1792                 {
1793                 buf=s->init_buf;
1794
1795                 d=p=(unsigned char *)&(buf->data[4]);
1796
1797                 /* get the list of acceptable cert types */
1798                 p++;
1799                 n=ssl3_get_req_cert_type(s,p);
1800                 d[0]=n;
1801                 p+=n;
1802                 n++;
1803
1804                 off=n;
1805                 p+=2;
1806                 n+=2;
1807
1808                 sk=SSL_get_client_CA_list(s);
1809                 nl=0;
1810                 if (sk != NULL)
1811                         {
1812                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1813                                 {
1814                                 name=sk_X509_NAME_value(sk,i);
1815                                 j=i2d_X509_NAME(name,NULL);
1816                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1817                                         {
1818                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1819                                         goto err;
1820                                         }
1821                                 p=(unsigned char *)&(buf->data[4+n]);
1822                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1823                                         {
1824                                         s2n(j,p);
1825                                         i2d_X509_NAME(name,&p);
1826                                         n+=2+j;
1827                                         nl+=2+j;
1828                                         }
1829                                 else
1830                                         {
1831                                         d=p;
1832                                         i2d_X509_NAME(name,&p);
1833                                         j-=2; s2n(j,d); j+=2;
1834                                         n+=j;
1835                                         nl+=j;
1836                                         }
1837                                 }
1838                         }
1839                 /* else no CA names */
1840                 p=(unsigned char *)&(buf->data[4+off]);
1841                 s2n(nl,p);
1842
1843                 d=(unsigned char *)buf->data;
1844                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1845                 l2n3(n,d);
1846
1847                 /* we should now have things packed up, so lets send
1848                  * it off */
1849
1850                 s->init_num=n+4;
1851                 s->init_off=0;
1852 #ifdef NETSCAPE_HANG_BUG
1853                 p=(unsigned char *)s->init_buf->data + s->init_num;
1854
1855                 /* do the header */
1856                 *(p++)=SSL3_MT_SERVER_DONE;
1857                 *(p++)=0;
1858                 *(p++)=0;
1859                 *(p++)=0;
1860                 s->init_num += 4;
1861 #endif
1862
1863                 s->state = SSL3_ST_SW_CERT_REQ_B;
1864                 }
1865
1866         /* SSL3_ST_SW_CERT_REQ_B */
1867         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1868 err:
1869         return(-1);
1870         }
1871
1872 int ssl3_get_client_key_exchange(SSL *s)
1873         {
1874         int i,al,ok;
1875         long n;
1876         unsigned long alg_k;
1877         unsigned char *p;
1878 #ifndef OPENSSL_NO_RSA
1879         RSA *rsa=NULL;
1880         EVP_PKEY *pkey=NULL;
1881 #endif
1882 #ifndef OPENSSL_NO_DH
1883         BIGNUM *pub=NULL;
1884         DH *dh_srvr;
1885 #endif
1886 #ifndef OPENSSL_NO_KRB5
1887         KSSL_ERR kssl_err;
1888 #endif /* OPENSSL_NO_KRB5 */
1889
1890 #ifndef OPENSSL_NO_ECDH
1891         EC_KEY *srvr_ecdh = NULL;
1892         EVP_PKEY *clnt_pub_pkey = NULL;
1893         EC_POINT *clnt_ecpoint = NULL;
1894         BN_CTX *bn_ctx = NULL; 
1895 #endif
1896
1897         n=s->method->ssl_get_message(s,
1898                 SSL3_ST_SR_KEY_EXCH_A,
1899                 SSL3_ST_SR_KEY_EXCH_B,
1900                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1901                 2048, /* ??? */
1902                 &ok);
1903
1904         if (!ok) return((int)n);
1905         p=(unsigned char *)s->init_msg;
1906
1907         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1908
1909 #ifndef OPENSSL_NO_RSA
1910         if (alg_k & SSL_kRSA)
1911                 {
1912                 /* FIX THIS UP EAY EAY EAY EAY */
1913                 if (s->s3->tmp.use_rsa_tmp)
1914                         {
1915                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1916                                 rsa=s->cert->rsa_tmp;
1917                         /* Don't do a callback because rsa_tmp should
1918                          * be sent already */
1919                         if (rsa == NULL)
1920                                 {
1921                                 al=SSL_AD_HANDSHAKE_FAILURE;
1922                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1923                                 goto f_err;
1924
1925                                 }
1926                         }
1927                 else
1928                         {
1929                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1930                         if (    (pkey == NULL) ||
1931                                 (pkey->type != EVP_PKEY_RSA) ||
1932                                 (pkey->pkey.rsa == NULL))
1933                                 {
1934                                 al=SSL_AD_HANDSHAKE_FAILURE;
1935                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1936                                 goto f_err;
1937                                 }
1938                         rsa=pkey->pkey.rsa;
1939                         }
1940
1941                 /* TLS and [incidentally] DTLS{0xFEFF} */
1942                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
1943                         {
1944                         n2s(p,i);
1945                         if (n != i+2)
1946                                 {
1947                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1948                                         {
1949                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1950                                         goto err;
1951                                         }
1952                                 else
1953                                         p-=2;
1954                                 }
1955                         else
1956                                 n=i;
1957                         }
1958
1959                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1960
1961                 al = -1;
1962                 
1963                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1964                         {
1965                         al=SSL_AD_DECODE_ERROR;
1966                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1967                         }
1968
1969                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1970                         {
1971                         /* The premaster secret must contain the same version number as the
1972                          * ClientHello to detect version rollback attacks (strangely, the
1973                          * protocol does not offer such protection for DH ciphersuites).
1974                          * However, buggy clients exist that send the negotiated protocol
1975                          * version instead if the server does not support the requested
1976                          * protocol version.
1977                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1978                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1979                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1980                                 {
1981                                 al=SSL_AD_DECODE_ERROR;
1982                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1983
1984                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1985                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1986                                  * number check as a "bad version oracle" -- an alert would
1987                                  * reveal that the plaintext corresponding to some ciphertext
1988                                  * made up by the adversary is properly formatted except
1989                                  * that the version number is wrong.  To avoid such attacks,
1990                                  * we should treat this just like any other decryption error. */
1991                                 }
1992                         }
1993
1994                 if (al != -1)
1995                         {
1996                         /* Some decryption failure -- use random value instead as countermeasure
1997                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1998                          * (see RFC 2246, section 7.4.7.1). */
1999                         ERR_clear_error();
2000                         i = SSL_MAX_MASTER_KEY_LENGTH;
2001                         p[0] = s->client_version >> 8;
2002                         p[1] = s->client_version & 0xff;
2003                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2004                                 goto err;
2005                         }
2006         
2007                 s->session->master_key_length=
2008                         s->method->ssl3_enc->generate_master_secret(s,
2009                                 s->session->master_key,
2010                                 p,i);
2011                 OPENSSL_cleanse(p,i);
2012                 }
2013         else
2014 #endif
2015 #ifndef OPENSSL_NO_DH
2016                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2017                 {
2018                 n2s(p,i);
2019                 if (n != i+2)
2020                         {
2021                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2022                                 {
2023                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2024                                 goto err;
2025                                 }
2026                         else
2027                                 {
2028                                 p-=2;
2029                                 i=(int)n;
2030                                 }
2031                         }
2032
2033                 if (n == 0L) /* the parameters are in the cert */
2034                         {
2035                         al=SSL_AD_HANDSHAKE_FAILURE;
2036                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2037                         goto f_err;
2038                         }
2039                 else
2040                         {
2041                         if (s->s3->tmp.dh == NULL)
2042                                 {
2043                                 al=SSL_AD_HANDSHAKE_FAILURE;
2044                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2045                                 goto f_err;
2046                                 }
2047                         else
2048                                 dh_srvr=s->s3->tmp.dh;
2049                         }
2050
2051                 pub=BN_bin2bn(p,i,NULL);
2052                 if (pub == NULL)
2053                         {
2054                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2055                         goto err;
2056                         }
2057
2058                 i=DH_compute_key(p,pub,dh_srvr);
2059
2060                 if (i <= 0)
2061                         {
2062                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2063                         goto err;
2064                         }
2065
2066                 DH_free(s->s3->tmp.dh);
2067                 s->s3->tmp.dh=NULL;
2068
2069                 BN_clear_free(pub);
2070                 pub=NULL;
2071                 s->session->master_key_length=
2072                         s->method->ssl3_enc->generate_master_secret(s,
2073                                 s->session->master_key,p,i);
2074                 OPENSSL_cleanse(p,i);
2075                 }
2076         else
2077 #endif
2078 #ifndef OPENSSL_NO_KRB5
2079         if (alg_k & SSL_kKRB5)
2080                 {
2081                 krb5_error_code         krb5rc;
2082                 krb5_data               enc_ticket;
2083                 krb5_data               authenticator;
2084                 krb5_data               enc_pms;
2085                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2086                 EVP_CIPHER_CTX          ciph_ctx;
2087                 const EVP_CIPHER        *enc = NULL;
2088                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2089                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2090                                                + EVP_MAX_BLOCK_LENGTH];
2091                 int                  padl, outl;
2092                 krb5_timestamp          authtime = 0;
2093                 krb5_ticket_times       ttimes;
2094
2095                 EVP_CIPHER_CTX_init(&ciph_ctx);
2096
2097                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2098
2099                 n2s(p,i);
2100                 enc_ticket.length = i;
2101
2102                 if (n < (long)(enc_ticket.length + 6))
2103                         {
2104                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2105                                 SSL_R_DATA_LENGTH_TOO_LONG);
2106                         goto err;
2107                         }
2108
2109                 enc_ticket.data = (char *)p;
2110                 p+=enc_ticket.length;
2111
2112                 n2s(p,i);
2113                 authenticator.length = i;
2114
2115                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2116                         {
2117                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2118                                 SSL_R_DATA_LENGTH_TOO_LONG);
2119                         goto err;
2120                         }
2121
2122                 authenticator.data = (char *)p;
2123                 p+=authenticator.length;
2124
2125                 n2s(p,i);
2126                 enc_pms.length = i;
2127                 enc_pms.data = (char *)p;
2128                 p+=enc_pms.length;
2129
2130                 /* Note that the length is checked again below,
2131                 ** after decryption
2132                 */
2133                 if(enc_pms.length > sizeof pms)
2134                         {
2135                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2136                                SSL_R_DATA_LENGTH_TOO_LONG);
2137                         goto err;
2138                         }
2139
2140                 if (n != (long)(enc_ticket.length + authenticator.length +
2141                                                 enc_pms.length + 6))
2142                         {
2143                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2144                                 SSL_R_DATA_LENGTH_TOO_LONG);
2145                         goto err;
2146                         }
2147
2148                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2149                                         &kssl_err)) != 0)
2150                         {
2151 #ifdef KSSL_DEBUG
2152                         printf("kssl_sget_tkt rtn %d [%d]\n",
2153                                 krb5rc, kssl_err.reason);
2154                         if (kssl_err.text)
2155                                 printf("kssl_err text= %s\n", kssl_err.text);
2156 #endif  /* KSSL_DEBUG */
2157                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2158                                 kssl_err.reason);
2159                         goto err;
2160                         }
2161
2162                 /*  Note: no authenticator is not considered an error,
2163                 **  but will return authtime == 0.
2164                 */
2165                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2166                                         &authtime, &kssl_err)) != 0)
2167                         {
2168 #ifdef KSSL_DEBUG
2169                         printf("kssl_check_authent rtn %d [%d]\n",
2170                                 krb5rc, kssl_err.reason);
2171                         if (kssl_err.text)
2172                                 printf("kssl_err text= %s\n", kssl_err.text);
2173 #endif  /* KSSL_DEBUG */
2174                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2175                                 kssl_err.reason);
2176                         goto err;
2177                         }
2178
2179                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2180                         {
2181                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2182                         goto err;
2183                         }
2184
2185 #ifdef KSSL_DEBUG
2186                 kssl_ctx_show(kssl_ctx);
2187 #endif  /* KSSL_DEBUG */
2188
2189                 enc = kssl_map_enc(kssl_ctx->enctype);
2190                 if (enc == NULL)
2191                     goto err;
2192
2193                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2194
2195                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2196                         {
2197                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2198                                 SSL_R_DECRYPTION_FAILED);
2199                         goto err;
2200                         }
2201                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2202                                         (unsigned char *)enc_pms.data, enc_pms.length))
2203                         {
2204                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2205                                 SSL_R_DECRYPTION_FAILED);
2206                         goto err;
2207                         }
2208                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2209                         {
2210                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2211                                 SSL_R_DATA_LENGTH_TOO_LONG);
2212                         goto err;
2213                         }
2214                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2215                         {
2216                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2217                                 SSL_R_DECRYPTION_FAILED);
2218                         goto err;
2219                         }
2220                 outl += padl;
2221                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2222                         {
2223                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2224                                 SSL_R_DATA_LENGTH_TOO_LONG);
2225                         goto err;
2226                         }
2227                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2228                     {
2229                     /* The premaster secret must contain the same version number as the
2230                      * ClientHello to detect version rollback attacks (strangely, the
2231                      * protocol does not offer such protection for DH ciphersuites).
2232                      * However, buggy clients exist that send random bytes instead of
2233                      * the protocol version.
2234                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2235                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2236                      */
2237                     if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2238                            (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2239                         {
2240                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2241                                SSL_AD_DECODE_ERROR);
2242                         goto err;
2243                         }
2244                     }
2245
2246                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2247
2248                 s->session->master_key_length=
2249                         s->method->ssl3_enc->generate_master_secret(s,
2250                                 s->session->master_key, pms, outl);
2251
2252                 if (kssl_ctx->client_princ)
2253                         {
2254                         size_t len = strlen(kssl_ctx->client_princ);
2255                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2256                                 {
2257                                 s->session->krb5_client_princ_len = len;
2258                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2259                                 }
2260                         }
2261
2262
2263                 /*  Was doing kssl_ctx_free() here,
2264                 **  but it caused problems for apache.
2265                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2266                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2267                 */
2268                 }
2269         else
2270 #endif  /* OPENSSL_NO_KRB5 */
2271
2272 #ifndef OPENSSL_NO_ECDH
2273                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2274                 {
2275                 int ret = 1;
2276                 int field_size = 0;
2277                 const EC_KEY   *tkey;
2278                 const EC_GROUP *group;
2279                 const BIGNUM *priv_key;
2280
2281                 /* initialize structures for server's ECDH key pair */
2282                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2283                         {
2284                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2285                             ERR_R_MALLOC_FAILURE);
2286                         goto err;
2287                         }
2288
2289                 /* Let's get server private key and group information */
2290                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2291                         { 
2292                         /* use the certificate */
2293                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2294                         }
2295                 else
2296                         {
2297                         /* use the ephermeral values we saved when
2298                          * generating the ServerKeyExchange msg.
2299                          */
2300                         tkey = s->s3->tmp.ecdh;
2301                         }
2302
2303                 group    = EC_KEY_get0_group(tkey);
2304                 priv_key = EC_KEY_get0_private_key(tkey);
2305
2306                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2307                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2308                         {
2309                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2310                                ERR_R_EC_LIB);
2311                         goto err;
2312                         }
2313
2314                 /* Let's get client's public key */
2315                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2316                         {
2317                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2318                             ERR_R_MALLOC_FAILURE);
2319                         goto err;
2320                         }
2321
2322                 if (n == 0L) 
2323                         {
2324                         /* Client Publickey was in Client Certificate */
2325
2326                          if (alg_k & SSL_kEECDH)
2327                                  {
2328                                  al=SSL_AD_HANDSHAKE_FAILURE;
2329                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2330                                  goto f_err;
2331                                  }
2332                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2333                             == NULL) || 
2334                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2335                                 {
2336                                 /* XXX: For now, we do not support client
2337                                  * authentication using ECDH certificates
2338                                  * so this branch (n == 0L) of the code is
2339                                  * never executed. When that support is
2340                                  * added, we ought to ensure the key 
2341                                  * received in the certificate is 
2342                                  * authorized for key agreement.
2343                                  * ECDH_compute_key implicitly checks that
2344                                  * the two ECDH shares are for the same
2345                                  * group.
2346                                  */
2347                                 al=SSL_AD_HANDSHAKE_FAILURE;
2348                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2349                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2350                                 goto f_err;
2351                                 }
2352
2353                         if (EC_POINT_copy(clnt_ecpoint,
2354                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2355                                 {
2356                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2357                                         ERR_R_EC_LIB);
2358                                 goto err;
2359                                 }
2360                         ret = 2; /* Skip certificate verify processing */
2361                         }
2362                 else
2363                         {
2364                         /* Get client's public key from encoded point
2365                          * in the ClientKeyExchange message.
2366                          */
2367                         if ((bn_ctx = BN_CTX_new()) == NULL)
2368                                 {
2369                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2370                                     ERR_R_MALLOC_FAILURE);
2371                                 goto err;
2372                                 }
2373
2374                         /* Get encoded point length */
2375                         i = *p; 
2376                         p += 1;
2377                         if (EC_POINT_oct2point(group, 
2378                             clnt_ecpoint, p, i, bn_ctx) == 0)
2379                                 {
2380                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2381                                     ERR_R_EC_LIB);
2382                                 goto err;
2383                                 }
2384                         /* p is pointing to somewhere in the buffer
2385                          * currently, so set it to the start 
2386                          */ 
2387                         p=(unsigned char *)s->init_buf->data;
2388                         }
2389
2390                 /* Compute the shared pre-master secret */
2391                 field_size = EC_GROUP_get_degree(group);
2392                 if (field_size <= 0)
2393                         {
2394                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2395                                ERR_R_ECDH_LIB);
2396                         goto err;
2397                         }
2398                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2399                 if (i <= 0)
2400                         {
2401                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2402                             ERR_R_ECDH_LIB);
2403                         goto err;
2404                         }
2405
2406                 EVP_PKEY_free(clnt_pub_pkey);
2407                 EC_POINT_free(clnt_ecpoint);
2408                 EC_KEY_free(srvr_ecdh);
2409                 BN_CTX_free(bn_ctx);
2410                 EC_KEY_free(s->s3->tmp.ecdh);
2411                 s->s3->tmp.ecdh = NULL; 
2412
2413                 /* Compute the master secret */
2414                 s->session->master_key_length = s->method->ssl3_enc-> \
2415                     generate_master_secret(s, s->session->master_key, p, i);
2416                 
2417                 OPENSSL_cleanse(p, i);
2418                 return (ret);
2419                 }
2420         else
2421 #endif
2422 #ifndef OPENSSL_NO_PSK
2423                 if (alg_k & SSL_kPSK)
2424                         {
2425                         unsigned char *t = NULL;
2426                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2427                         unsigned int pre_ms_len = 0, psk_len = 0;
2428                         int psk_err = 1;
2429                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2430
2431                         al=SSL_AD_HANDSHAKE_FAILURE;
2432
2433                         n2s(p,i);
2434                         if (n != i+2)
2435                                 {
2436                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2437                                         SSL_R_LENGTH_MISMATCH);
2438                                 goto psk_err;
2439                                 }
2440                         if (i > PSK_MAX_IDENTITY_LEN)
2441                                 {
2442                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2443                                         SSL_R_DATA_LENGTH_TOO_LONG);
2444                                 goto psk_err;
2445                                 }
2446                         if (s->psk_server_callback == NULL)
2447                                 {
2448                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2449                                        SSL_R_PSK_NO_SERVER_CB);
2450                                 goto psk_err;
2451                                 }
2452
2453                         /* Create guaranteed NULL-terminated identity
2454                          * string for the callback */
2455                         memcpy(tmp_id, p, i);
2456                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2457                         psk_len = s->psk_server_callback(s, tmp_id,
2458                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2459                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2460
2461                         if (psk_len > PSK_MAX_PSK_LEN)
2462                                 {
2463                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2464                                         ERR_R_INTERNAL_ERROR);
2465                                 goto psk_err;
2466                                 }
2467                         else if (psk_len == 0)
2468                                 {
2469                                 /* PSK related to the given identity not found */
2470                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2471                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2472                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2473                                 goto psk_err;
2474                                 }
2475
2476                         /* create PSK pre_master_secret */
2477                         pre_ms_len=2+psk_len+2+psk_len;
2478                         t = psk_or_pre_ms;
2479                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2480                         s2n(psk_len, t);
2481                         memset(t, 0, psk_len);
2482                         t+=psk_len;
2483                         s2n(psk_len, t);
2484
2485                         if (s->session->psk_identity != NULL)
2486                                 OPENSSL_free(s->session->psk_identity);
2487                         s->session->psk_identity = BUF_strdup((char *)p);
2488                         if (s->session->psk_identity == NULL)
2489                                 {
2490                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2491                                         ERR_R_MALLOC_FAILURE);
2492                                 goto psk_err;
2493                                 }
2494
2495                         if (s->session->psk_identity_hint != NULL)
2496                                 OPENSSL_free(s->session->psk_identity_hint);
2497                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2498                         if (s->ctx->psk_identity_hint != NULL &&
2499                                 s->session->psk_identity_hint == NULL)
2500                                 {
2501                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2502                                         ERR_R_MALLOC_FAILURE);
2503                                 goto psk_err;
2504                                 }
2505
2506                         s->session->master_key_length=
2507                                 s->method->ssl3_enc->generate_master_secret(s,
2508                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2509                         psk_err = 0;
2510                 psk_err:
2511                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2512                         if (psk_err != 0)
2513                                 goto f_err;
2514                         }
2515                 else
2516 #endif
2517                 if (alg_k & SSL_kGOST) 
2518                         {
2519                         int ret = 0;
2520                         EVP_PKEY_CTX *pkey_ctx;
2521                         EVP_PKEY *client_pub_pkey = NULL;
2522                         unsigned char premaster_secret[32], *start;
2523                         size_t outlen=32, inlen;                        
2524
2525                         /* Get our certificate private key*/
2526                         pkey_ctx = EVP_PKEY_CTX_new(s->cert->key->privatekey,NULL);     
2527                         EVP_PKEY_decrypt_init(pkey_ctx);
2528                         /* If client certificate is present and is of the same type, maybe
2529                          * use it for key exchange.  Don't mind errors from
2530                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2531                          * a client certificate for authorization only. */
2532                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2533                         if (client_pub_pkey)
2534                                 {
2535                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2536                                         ERR_clear_error();
2537                                 }
2538                         /* Decrypt session key */
2539                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2540                                 {
2541                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2542                                 goto gerr;
2543                                 }
2544                         if (p[1] == 0x81)
2545                                 {
2546                                 start = p+3;
2547                                 inlen = p[2];
2548                                 }
2549                         else if (p[1] < 0x80)
2550                                 {
2551                                 start = p+2;
2552                                 inlen = p[1];
2553                                 }
2554                         else
2555                                 {
2556                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2557                                 goto gerr;
2558                                 }
2559                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2560
2561                                 {
2562                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2563                                 goto gerr;
2564                                 }
2565                         /* Generate master secret */
2566                         s->session->master_key_length=
2567                                 s->method->ssl3_enc->generate_master_secret(s,
2568                                         s->session->master_key,premaster_secret,32);
2569                         /* Check if pubkey from client certificate was used */
2570                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2571                                 ret = 2;
2572                         else
2573                                 ret = 1;
2574                 gerr:
2575                         EVP_PKEY_free(client_pub_pkey);
2576                         EVP_PKEY_CTX_free(pkey_ctx);
2577                         if (ret)
2578                                 return ret;
2579                         else
2580                                 goto err;
2581                         }
2582                 else
2583                 {
2584                 al=SSL_AD_HANDSHAKE_FAILURE;
2585                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2586                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2587                 goto f_err;
2588                 }
2589
2590         return(1);
2591 f_err:
2592         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2593 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2594 err:
2595 #endif
2596 #ifndef OPENSSL_NO_ECDH
2597         EVP_PKEY_free(clnt_pub_pkey);
2598         EC_POINT_free(clnt_ecpoint);
2599         if (srvr_ecdh != NULL) 
2600                 EC_KEY_free(srvr_ecdh);
2601         BN_CTX_free(bn_ctx);
2602 #endif
2603         return(-1);
2604         }
2605
2606 int ssl3_get_cert_verify(SSL *s)
2607         {
2608         EVP_PKEY *pkey=NULL;
2609         unsigned char *p;
2610         int al,ok,ret=0;
2611         long n;
2612         int type=0,i,j;
2613         X509 *peer;
2614
2615         n=s->method->ssl_get_message(s,
2616                 SSL3_ST_SR_CERT_VRFY_A,
2617                 SSL3_ST_SR_CERT_VRFY_B,
2618                 -1,
2619                 514, /* 514? */
2620                 &ok);
2621
2622         if (!ok) return((int)n);
2623
2624         if (s->session->peer != NULL)
2625                 {
2626                 peer=s->session->peer;
2627                 pkey=X509_get_pubkey(peer);
2628                 type=X509_certificate_type(peer,pkey);
2629                 }
2630         else
2631                 {
2632                 peer=NULL;
2633                 pkey=NULL;
2634                 }
2635
2636         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2637                 {
2638                 s->s3->tmp.reuse_message=1;
2639                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2640                         {
2641                         al=SSL_AD_UNEXPECTED_MESSAGE;
2642                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2643                         goto f_err;
2644                         }
2645                 ret=1;
2646                 goto end;
2647                 }
2648
2649         if (peer == NULL)
2650                 {
2651                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2652                 al=SSL_AD_UNEXPECTED_MESSAGE;
2653                 goto f_err;
2654                 }
2655
2656         if (!(type & EVP_PKT_SIGN))
2657                 {
2658                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2659                 al=SSL_AD_ILLEGAL_PARAMETER;
2660                 goto f_err;
2661                 }
2662
2663         if (s->s3->change_cipher_spec)
2664                 {
2665                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2666                 al=SSL_AD_UNEXPECTED_MESSAGE;
2667                 goto f_err;
2668                 }
2669
2670         /* we now have a signature that we need to verify */
2671         p=(unsigned char *)s->init_msg;
2672         /* Check for broken implementations of GOST ciphersuites */
2673         /* If key is GOST and n is exactly 64, it is bare
2674          * signature without length field */
2675         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2676                 pkey->type == NID_id_GostR3410_2001) )
2677                 {
2678                 i=64;
2679                 } 
2680         else 
2681                 {       
2682                 n2s(p,i);
2683                 n-=2;
2684                 if (i > n)
2685                         {
2686                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2687                         al=SSL_AD_DECODE_ERROR;
2688                         goto f_err;
2689                         }
2690         }
2691         j=EVP_PKEY_size(pkey);
2692         if ((i > j) || (n > j) || (n <= 0))
2693                 {
2694                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2695                 al=SSL_AD_DECODE_ERROR;
2696                 goto f_err;
2697                 }
2698
2699 #ifndef OPENSSL_NO_RSA 
2700         if (pkey->type == EVP_PKEY_RSA)
2701                 {
2702                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2703                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
2704                                                         pkey->pkey.rsa);
2705                 if (i < 0)
2706                         {
2707                         al=SSL_AD_DECRYPT_ERROR;
2708                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2709                         goto f_err;
2710                         }
2711                 if (i == 0)
2712                         {
2713                         al=SSL_AD_DECRYPT_ERROR;
2714                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2715                         goto f_err;
2716                         }
2717                 }
2718         else
2719 #endif
2720 #ifndef OPENSSL_NO_DSA
2721                 if (pkey->type == EVP_PKEY_DSA)
2722                 {
2723                 j=DSA_verify(pkey->save_type,
2724                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2725                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2726                 if (j <= 0)
2727                         {
2728                         /* bad signature */
2729                         al=SSL_AD_DECRYPT_ERROR;
2730                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2731                         goto f_err;
2732                         }
2733                 }
2734         else
2735 #endif
2736 #ifndef OPENSSL_NO_ECDSA
2737                 if (pkey->type == EVP_PKEY_EC)
2738                 {
2739                 j=ECDSA_verify(pkey->save_type,
2740                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2741                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2742                 if (j <= 0)
2743                         {
2744                         /* bad signature */
2745                         al=SSL_AD_DECRYPT_ERROR;
2746                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2747                             SSL_R_BAD_ECDSA_SIGNATURE);
2748                         goto f_err;
2749                         }
2750                 }
2751         else
2752 #endif
2753         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2754                 {   unsigned char signature[64];
2755                         int idx;
2756                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2757                         EVP_PKEY_verify_init(pctx);
2758                         if (i!=64) {
2759                                 fprintf(stderr,"GOST signature length is %d",i);
2760                         }       
2761                         for (idx=0;idx<64;idx++) {
2762                                 signature[63-idx]=p[idx];
2763                         }       
2764                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2765                         EVP_PKEY_CTX_free(pctx);
2766                         if (j<=0) 
2767                                 {
2768                                 al=SSL_AD_DECRYPT_ERROR;
2769                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2770                                         SSL_R_BAD_ECDSA_SIGNATURE);
2771                                 goto f_err;
2772                                 }       
2773                 }
2774         else    
2775                 {
2776                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2777                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2778                 goto f_err;
2779                 }
2780
2781
2782         ret=1;
2783         if (0)
2784                 {
2785 f_err:
2786                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2787                 }
2788 end:
2789         EVP_PKEY_free(pkey);
2790         return(ret);
2791         }
2792
2793 int ssl3_get_client_certificate(SSL *s)
2794         {
2795         int i,ok,al,ret= -1;
2796         X509 *x=NULL;
2797         unsigned long l,nc,llen,n;
2798         const unsigned char *p,*q;
2799         unsigned char *d;
2800         STACK_OF(X509) *sk=NULL;
2801
2802         n=s->method->ssl_get_message(s,
2803                 SSL3_ST_SR_CERT_A,
2804                 SSL3_ST_SR_CERT_B,
2805                 -1,
2806                 s->max_cert_list,
2807                 &ok);
2808
2809         if (!ok) return((int)n);
2810
2811         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2812                 {
2813                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2814                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2815                         {
2816                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2817                         al=SSL_AD_HANDSHAKE_FAILURE;
2818                         goto f_err;
2819                         }
2820                 /* If tls asked for a client cert, the client must return a 0 list */
2821                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2822                         {
2823                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2824                         al=SSL_AD_UNEXPECTED_MESSAGE;
2825                         goto f_err;
2826                         }
2827                 s->s3->tmp.reuse_message=1;
2828                 return(1);
2829                 }
2830
2831         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2832                 {
2833                 al=SSL_AD_UNEXPECTED_MESSAGE;
2834                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2835                 goto f_err;
2836                 }
2837         p=d=(unsigned char *)s->init_msg;
2838
2839         if ((sk=sk_X509_new_null()) == NULL)
2840                 {
2841                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2842                 goto err;
2843                 }
2844
2845         n2l3(p,llen);
2846         if (llen+3 != n)
2847                 {
2848                 al=SSL_AD_DECODE_ERROR;
2849                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2850                 goto f_err;
2851                 }
2852         for (nc=0; nc<llen; )
2853                 {
2854                 n2l3(p,l);
2855                 if ((l+nc+3) > llen)
2856                         {
2857                         al=SSL_AD_DECODE_ERROR;
2858                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2859                         goto f_err;
2860                         }
2861
2862                 q=p;
2863                 x=d2i_X509(NULL,&p,l);
2864                 if (x == NULL)
2865                         {
2866                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2867                         goto err;
2868                         }
2869                 if (p != (q+l))
2870                         {
2871                         al=SSL_AD_DECODE_ERROR;
2872                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2873                         goto f_err;
2874                         }
2875                 if (!sk_X509_push(sk,x))
2876                         {
2877                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2878                         goto err;
2879                         }
2880                 x=NULL;
2881                 nc+=l+3;
2882                 }
2883
2884         if (sk_X509_num(sk) <= 0)
2885                 {
2886                 /* TLS does not mind 0 certs returned */
2887                 if (s->version == SSL3_VERSION)
2888                         {
2889                         al=SSL_AD_HANDSHAKE_FAILURE;
2890                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2891                         goto f_err;
2892                         }
2893                 /* Fail for TLS only if we required a certificate */
2894                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2895                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2896                         {
2897                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2898                         al=SSL_AD_HANDSHAKE_FAILURE;
2899                         goto f_err;
2900                         }
2901                 }
2902         else
2903                 {
2904                 i=ssl_verify_cert_chain(s,sk);
2905                 if (i <= 0)
2906                         {
2907                         al=ssl_verify_alarm_type(s->verify_result);
2908                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2909                         goto f_err;
2910                         }
2911                 }
2912
2913         if (s->session->peer != NULL) /* This should not be needed */
2914                 X509_free(s->session->peer);
2915         s->session->peer=sk_X509_shift(sk);
2916         s->session->verify_result = s->verify_result;
2917
2918         /* With the current implementation, sess_cert will always be NULL
2919          * when we arrive here. */
2920         if (s->session->sess_cert == NULL)
2921                 {
2922                 s->session->sess_cert = ssl_sess_cert_new();
2923                 if (s->session->sess_cert == NULL)
2924                         {
2925                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2926                         goto err;
2927                         }
2928                 }
2929         if (s->session->sess_cert->cert_chain != NULL)
2930                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2931         s->session->sess_cert->cert_chain=sk;
2932         /* Inconsistency alert: cert_chain does *not* include the
2933          * peer's own certificate, while we do include it in s3_clnt.c */
2934
2935         sk=NULL;
2936
2937         ret=1;
2938         if (0)
2939                 {
2940 f_err:
2941                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2942                 }
2943 err:
2944         if (x != NULL) X509_free(x);
2945         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2946         return(ret);
2947         }
2948
2949 int ssl3_send_server_certificate(SSL *s)
2950         {
2951         unsigned long l;
2952         X509 *x;
2953
2954         if (s->state == SSL3_ST_SW_CERT_A)
2955                 {
2956                 x=ssl_get_server_send_cert(s);
2957                 if (x == NULL)
2958                         {
2959                         /* VRS: allow null cert if auth == KRB5 */
2960                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
2961                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
2962                                 {
2963                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2964                                 return(0);
2965                                 }
2966                         }
2967
2968                 l=ssl3_output_cert_chain(s,x);
2969                 s->state=SSL3_ST_SW_CERT_B;
2970                 s->init_num=(int)l;
2971                 s->init_off=0;
2972                 }
2973
2974         /* SSL3_ST_SW_CERT_B */
2975         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2976         }
2977 #ifndef OPENSSL_NO_TLSEXT
2978 int ssl3_send_newsession_ticket(SSL *s)
2979         {
2980         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2981                 {
2982                 unsigned char *p, *senc, *macstart;
2983                 int len, slen;
2984                 unsigned int hlen;
2985                 EVP_CIPHER_CTX ctx;
2986                 HMAC_CTX hctx;
2987                 SSL_CTX *tctx = s->initial_ctx;
2988                 unsigned char iv[EVP_MAX_IV_LENGTH];
2989                 unsigned char key_name[16];
2990
2991                 /* get session encoding length */
2992                 slen = i2d_SSL_SESSION(s->session, NULL);
2993                 /* Some length values are 16 bits, so forget it if session is
2994                  * too long
2995                  */
2996                 if (slen > 0xFF00)
2997                         return -1;
2998                 /* Grow buffer if need be: the length calculation is as
2999                  * follows 1 (size of message name) + 3 (message length
3000                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3001                  * 16 (key name) + max_iv_len (iv length) +
3002                  * session_length + max_enc_block_size (max encrypted session
3003                  * length) + max_md_size (HMAC).
3004                  */
3005                 if (!BUF_MEM_grow(s->init_buf,
3006                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3007                         EVP_MAX_MD_SIZE + slen))
3008                         return -1;
3009                 senc = OPENSSL_malloc(slen);
3010                 if (!senc)
3011                         return -1;
3012                 p = senc;
3013                 i2d_SSL_SESSION(s->session, &p);
3014
3015                 p=(unsigned char *)s->init_buf->data;
3016                 /* do the header */
3017                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3018                 /* Skip message length for now */
3019                 p += 3;
3020                 EVP_CIPHER_CTX_init(&ctx);
3021                 HMAC_CTX_init(&hctx);
3022                 /* Initialize HMAC and cipher contexts. If callback present
3023                  * it does all the work otherwise use generated values
3024                  * from parent ctx.
3025                  */
3026                 if (tctx->tlsext_ticket_key_cb)
3027                         {
3028                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3029                                                          &hctx, 1) < 0)
3030                                 {
3031                                 OPENSSL_free(senc);
3032                                 return -1;
3033                                 }
3034                         }
3035                 else
3036                         {
3037                         RAND_pseudo_bytes(iv, 16);
3038                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3039                                         tctx->tlsext_tick_aes_key, iv);
3040                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3041                                         tlsext_tick_md(), NULL);
3042                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3043           &n