only send heartbeat extension from server if client sent one
[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 <openssl/crypto.h>
156 #include "ssl_locl.h"
157 #include "kssl_lcl.h"
158 #include <openssl/buffer.h>
159 #include <openssl/rand.h>
160 #include <openssl/objects.h>
161 #include <openssl/evp.h>
162 #include <openssl/hmac.h>
163 #include <openssl/x509.h>
164 #ifndef OPENSSL_NO_DH
165 #include <openssl/dh.h>
166 #endif
167 #include <openssl/bn.h>
168 #ifndef OPENSSL_NO_KRB5
169 #include <openssl/krb5_asn.h>
170 #endif
171 #include <openssl/md5.h>
172
173 static const SSL_METHOD *ssl3_get_server_method(int ver);
174
175 static const SSL_METHOD *ssl3_get_server_method(int ver)
176         {
177         if (ver == SSL3_VERSION)
178                 return(SSLv3_server_method());
179         else
180                 return(NULL);
181         }
182
183 #ifndef OPENSSL_NO_SRP
184 static int ssl_check_srp_ext_ClientHello(SSL *s,int *al)
185         {
186         int ret = SSL_ERROR_NONE;
187
188         *al = SSL_AD_UNRECOGNIZED_NAME;
189
190         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
191             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
192                 {
193                 if(s->srp_ctx.login == NULL)
194                         {
195                         /* RFC 5054 says SHOULD reject, 
196                            we do so if There is no srp login name */
197                         ret = SSL3_AL_FATAL;
198                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
199                         }
200                 else
201                         {
202                         ret = SSL_srp_server_param_with_username(s,al);
203                         }
204                 }
205         return ret;
206         }
207 #endif
208
209 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
210                         ssl3_accept,
211                         ssl_undefined_function,
212                         ssl3_get_server_method)
213
214 int ssl3_accept(SSL *s)
215         {
216         BUF_MEM *buf;
217         unsigned long alg_k,Time=(unsigned long)time(NULL);
218         void (*cb)(const SSL *ssl,int type,int val)=NULL;
219         int ret= -1;
220         int new_state,state,skip=0;
221
222         RAND_add(&Time,sizeof(Time),0);
223         ERR_clear_error();
224         clear_sys_error();
225
226         if (s->info_callback != NULL)
227                 cb=s->info_callback;
228         else if (s->ctx->info_callback != NULL)
229                 cb=s->ctx->info_callback;
230
231         /* init things to blank */
232         s->in_handshake++;
233         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
234
235         if (s->cert == NULL)
236                 {
237                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
238                 return(-1);
239                 }
240
241 #ifndef OPENSSL_NO_HEARTBEATS
242         /* If we're awaiting a HeartbeatResponse, pretend we
243          * already got and don't await it anymore, because
244          * Heartbeats don't make sense during handshakes anyway.
245          */
246         if (s->tlsext_hb_pending)
247                 {
248                 s->tlsext_hb_pending = 0;
249                 s->tlsext_hb_seq++;
250                 }
251 #endif
252
253         for (;;)
254                 {
255                 state=s->state;
256
257                 switch (s->state)
258                         {
259                 case SSL_ST_RENEGOTIATE:
260                         s->renegotiate=1;
261                         /* s->state=SSL_ST_ACCEPT; */
262
263                 case SSL_ST_BEFORE:
264                 case SSL_ST_ACCEPT:
265                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
266                 case SSL_ST_OK|SSL_ST_ACCEPT:
267
268                         s->server=1;
269                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
270
271                         if ((s->version>>8) != 3)
272                                 {
273                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
274                                 return -1;
275                                 }
276                         s->type=SSL_ST_ACCEPT;
277
278                         if (s->init_buf == NULL)
279                                 {
280                                 if ((buf=BUF_MEM_new()) == NULL)
281                                         {
282                                         ret= -1;
283                                         goto end;
284                                         }
285                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
286                                         {
287                                         ret= -1;
288                                         goto end;
289                                         }
290                                 s->init_buf=buf;
291                                 }
292
293                         if (!ssl3_setup_buffers(s))
294                                 {
295                                 ret= -1;
296                                 goto end;
297                                 }
298
299                         s->init_num=0;
300                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
301
302                         if (s->state != SSL_ST_RENEGOTIATE)
303                                 {
304                                 /* Ok, we now need to push on a buffering BIO so that
305                                  * the output is sent in a way that TCP likes :-)
306                                  */
307                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
308                                 
309                                 ssl3_init_finished_mac(s);
310                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
311                                 s->ctx->stats.sess_accept++;
312                                 }
313                         else if (!s->s3->send_connection_binding &&
314                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
315                                 {
316                                 /* Server attempting to renegotiate with
317                                  * client that doesn't support secure
318                                  * renegotiation.
319                                  */
320                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
321                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
322                                 ret = -1;
323                                 goto end;
324                                 }
325                         else
326                                 {
327                                 /* s->state == SSL_ST_RENEGOTIATE,
328                                  * we will just send a HelloRequest */
329                                 s->ctx->stats.sess_accept_renegotiate++;
330                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
331                                 }
332                         break;
333
334                 case SSL3_ST_SW_HELLO_REQ_A:
335                 case SSL3_ST_SW_HELLO_REQ_B:
336
337                         s->shutdown=0;
338                         ret=ssl3_send_hello_request(s);
339                         if (ret <= 0) goto end;
340                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
341                         s->state=SSL3_ST_SW_FLUSH;
342                         s->init_num=0;
343
344                         ssl3_init_finished_mac(s);
345                         break;
346
347                 case SSL3_ST_SW_HELLO_REQ_C:
348                         s->state=SSL_ST_OK;
349                         break;
350
351                 case SSL3_ST_SR_CLNT_HELLO_A:
352                 case SSL3_ST_SR_CLNT_HELLO_B:
353                 case SSL3_ST_SR_CLNT_HELLO_C:
354
355                         if (s->rwstate != SSL_X509_LOOKUP)
356                         {
357                                 ret=ssl3_get_client_hello(s);
358                                 if (ret <= 0) goto end;
359                         }
360 #ifndef OPENSSL_NO_SRP
361                         {
362                         int al;
363                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
364                                         {
365                                         /* callback indicates firther work to be done */
366                                         s->rwstate=SSL_X509_LOOKUP;
367                                         goto end;
368                                         }
369                         if (ret != SSL_ERROR_NONE)
370                                 {
371                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);    
372                                 /* This is not really an error but the only means to
373                                    for a client to detect whether srp is supported. */
374                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)      
375                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);                     
376                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;                       
377                                 ret= -1;
378                                 goto end;       
379                                 }
380                         }
381 #endif          
382                         
383                         s->renegotiate = 2;
384                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
385                         s->init_num=0;
386                         break;
387
388                 case SSL3_ST_SW_SRVR_HELLO_A:
389                 case SSL3_ST_SW_SRVR_HELLO_B:
390                         ret=ssl3_send_server_hello(s);
391                         if (ret <= 0) goto end;
392 #ifndef OPENSSL_NO_TLSEXT
393                         if (s->hit)
394                                 {
395                                 if (s->tlsext_ticket_expected)
396                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
397                                 else
398                                         s->state=SSL3_ST_SW_CHANGE_A;
399                                 }
400 #else
401                         if (s->hit)
402                                         s->state=SSL3_ST_SW_CHANGE_A;
403 #endif
404                         else
405                                 s->state=SSL3_ST_SW_CERT_A;
406                         s->init_num=0;
407                         break;
408
409                 case SSL3_ST_SW_CERT_A:
410                 case SSL3_ST_SW_CERT_B:
411                         /* Check if it is anon DH or anon ECDH, */
412                         /* normal PSK or KRB5 or SRP */
413                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
414                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
415                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
416                                 {
417                                 ret=ssl3_send_server_certificate(s);
418                                 if (ret <= 0) goto end;
419 #ifndef OPENSSL_NO_TLSEXT
420                                 if (s->tlsext_status_expected)
421                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
422                                 else
423                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
424                                 }
425                         else
426                                 {
427                                 skip = 1;
428                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
429                                 }
430 #else
431                                 }
432                         else
433                                 skip=1;
434
435                         s->state=SSL3_ST_SW_KEY_EXCH_A;
436 #endif
437                         s->init_num=0;
438                         break;
439
440                 case SSL3_ST_SW_KEY_EXCH_A:
441                 case SSL3_ST_SW_KEY_EXCH_B:
442                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
443
444                         /* clear this, it may get reset by
445                          * send_server_key_exchange */
446                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
447 #ifndef OPENSSL_NO_KRB5
448                                 && !(alg_k & SSL_kKRB5)
449 #endif /* OPENSSL_NO_KRB5 */
450                                 )
451                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
452                                  * even when forbidden by protocol specs
453                                  * (handshake may fail as clients are not required to
454                                  * be able to handle this) */
455                                 s->s3->tmp.use_rsa_tmp=1;
456                         else
457                                 s->s3->tmp.use_rsa_tmp=0;
458
459
460                         /* only send if a DH key exchange, fortezza or
461                          * RSA but we have a sign only certificate
462                          *
463                          * PSK: may send PSK identity hints
464                          *
465                          * For ECC ciphersuites, we send a serverKeyExchange
466                          * message only if the cipher suite is either
467                          * ECDH-anon or ECDHE. In other cases, the
468                          * server certificate contains the server's
469                          * public key for key exchange.
470                          */
471                         if (s->s3->tmp.use_rsa_tmp
472                         /* PSK: send ServerKeyExchange if PSK identity
473                          * hint if provided */
474 #ifndef OPENSSL_NO_PSK
475                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
476 #endif
477 #ifndef OPENSSL_NO_SRP
478                             /* SRP: send ServerKeyExchange */
479                             || (alg_k & SSL_kSRP)
480 #endif
481                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
482                             || (alg_k & SSL_kEECDH)
483                             || ((alg_k & SSL_kRSA)
484                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
485                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
486                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
487                                         )
488                                     )
489                                 )
490                             )
491                                 {
492                                 ret=ssl3_send_server_key_exchange(s);
493                                 if (ret <= 0) goto end;
494                                 }
495                         else
496                                 skip=1;
497
498                         s->state=SSL3_ST_SW_CERT_REQ_A;
499                         s->init_num=0;
500                         break;
501
502                 case SSL3_ST_SW_CERT_REQ_A:
503                 case SSL3_ST_SW_CERT_REQ_B:
504                         if (/* don't request cert unless asked for it: */
505                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
506                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
507                                  * don't request cert during re-negotiation: */
508                                 ((s->session->peer != NULL) &&
509                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
510                                 /* never request cert in anonymous ciphersuites
511                                  * (see section "Certificate request" in SSL 3 drafts
512                                  * and in RFC 2246): */
513                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
514                                  /* ... except when the application insists on verification
515                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
516                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
517                                  /* never request cert in Kerberos ciphersuites */
518                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
519                                 /* With normal PSK Certificates and
520                                  * Certificate Requests are omitted */
521                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
522                                 {
523                                 /* no cert request */
524                                 skip=1;
525                                 s->s3->tmp.cert_request=0;
526                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
527                                 if (s->s3->handshake_buffer)
528                                         if (!ssl3_digest_cached_records(s))
529                                                 return -1;
530                                 }
531                         else
532                                 {
533                                 s->s3->tmp.cert_request=1;
534                                 ret=ssl3_send_certificate_request(s);
535                                 if (ret <= 0) goto end;
536 #ifndef NETSCAPE_HANG_BUG
537                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
538 #else
539                                 s->state=SSL3_ST_SW_FLUSH;
540                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
541 #endif
542                                 s->init_num=0;
543                                 }
544                         break;
545
546                 case SSL3_ST_SW_SRVR_DONE_A:
547                 case SSL3_ST_SW_SRVR_DONE_B:
548                         ret=ssl3_send_server_done(s);
549                         if (ret <= 0) goto end;
550                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
551                         s->state=SSL3_ST_SW_FLUSH;
552                         s->init_num=0;
553                         break;
554                 
555                 case SSL3_ST_SW_FLUSH:
556
557                         /* This code originally checked to see if
558                          * any data was pending using BIO_CTRL_INFO
559                          * and then flushed. This caused problems
560                          * as documented in PR#1939. The proposed
561                          * fix doesn't completely resolve this issue
562                          * as buggy implementations of BIO_CTRL_PENDING
563                          * still exist. So instead we just flush
564                          * unconditionally.
565                          */
566
567                         s->rwstate=SSL_WRITING;
568                         if (BIO_flush(s->wbio) <= 0)
569                                 {
570                                 ret= -1;
571                                 goto end;
572                                 }
573                         s->rwstate=SSL_NOTHING;
574
575                         s->state=s->s3->tmp.next_state;
576                         break;
577
578                 case SSL3_ST_SR_CERT_A:
579                 case SSL3_ST_SR_CERT_B:
580                         /* Check for second client hello (MS SGC) */
581                         ret = ssl3_check_client_hello(s);
582                         if (ret <= 0)
583                                 goto end;
584                         if (ret == 2)
585                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
586                         else {
587                                 if (s->s3->tmp.cert_request)
588                                         {
589                                         ret=ssl3_get_client_certificate(s);
590                                         if (ret <= 0) goto end;
591                                         }
592                                 s->init_num=0;
593                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
594                         }
595                         break;
596
597                 case SSL3_ST_SR_KEY_EXCH_A:
598                 case SSL3_ST_SR_KEY_EXCH_B:
599                         ret=ssl3_get_client_key_exchange(s);
600                         if (ret <= 0)
601                                 goto end;
602                         if (ret == 2)
603                                 {
604                                 /* For the ECDH ciphersuites when
605                                  * the client sends its ECDH pub key in
606                                  * a certificate, the CertificateVerify
607                                  * message is not sent.
608                                  * Also for GOST ciphersuites when
609                                  * the client uses its key from the certificate
610                                  * for key exchange.
611                                  */
612 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
613                                 s->state=SSL3_ST_SR_FINISHED_A;
614 #else
615                                 if (s->s3->next_proto_neg_seen)
616                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
617                                 else
618                                         s->state=SSL3_ST_SR_FINISHED_A;
619 #endif
620                                 s->init_num = 0;
621                                 }
622                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
623                                 {
624                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
625                                 s->init_num=0;
626                                 if (!s->session->peer)
627                                         break;
628                                 /* For TLS v1.2 freeze the handshake buffer
629                                  * at this point and digest cached records.
630                                  */
631                                 if (!s->s3->handshake_buffer)
632                                         {
633                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
634                                         return -1;
635                                         }
636                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
637                                 if (!ssl3_digest_cached_records(s))
638                                         return -1;
639                                 }
640                         else
641                                 {
642                                 int offset=0;
643                                 int dgst_num;
644
645                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
646                                 s->init_num=0;
647
648                                 /* We need to get hashes here so if there is
649                                  * a client cert, it can be verified
650                                  * FIXME - digest processing for CertificateVerify
651                                  * should be generalized. But it is next step
652                                  */
653                                 if (s->s3->handshake_buffer)
654                                         if (!ssl3_digest_cached_records(s))
655                                                 return -1;
656                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
657                                         if (s->s3->handshake_dgst[dgst_num]) 
658                                                 {
659                                                 int dgst_size;
660
661                                                 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]));
662                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
663                                                 if (dgst_size < 0)
664                                                         {
665                                                         ret = -1;
666                                                         goto end;
667                                                         }
668                                                 offset+=dgst_size;
669                                                 }               
670                                 }
671                         break;
672
673                 case SSL3_ST_SR_CERT_VRFY_A:
674                 case SSL3_ST_SR_CERT_VRFY_B:
675
676                         /* we should decide if we expected this one */
677                         ret=ssl3_get_cert_verify(s);
678                         if (ret <= 0) goto end;
679
680 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
681                         s->state=SSL3_ST_SR_FINISHED_A;
682 #else
683                         if (s->s3->next_proto_neg_seen)
684                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
685                         else
686                                 s->state=SSL3_ST_SR_FINISHED_A;
687 #endif
688                         s->init_num=0;
689                         break;
690
691 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
692                 case SSL3_ST_SR_NEXT_PROTO_A:
693                 case SSL3_ST_SR_NEXT_PROTO_B:
694                         ret=ssl3_get_next_proto(s);
695                         if (ret <= 0) goto end;
696                         s->init_num = 0;
697                         s->state=SSL3_ST_SR_FINISHED_A;
698                         break;
699 #endif
700
701                 case SSL3_ST_SR_FINISHED_A:
702                 case SSL3_ST_SR_FINISHED_B:
703                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
704                                 SSL3_ST_SR_FINISHED_B);
705                         if (ret <= 0) goto end;
706                         if (s->hit)
707                                 s->state=SSL_ST_OK;
708 #ifndef OPENSSL_NO_TLSEXT
709                         else if (s->tlsext_ticket_expected)
710                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
711 #endif
712                         else
713                                 s->state=SSL3_ST_SW_CHANGE_A;
714                         s->init_num=0;
715                         break;
716
717 #ifndef OPENSSL_NO_TLSEXT
718                 case SSL3_ST_SW_SESSION_TICKET_A:
719                 case SSL3_ST_SW_SESSION_TICKET_B:
720                         ret=ssl3_send_newsession_ticket(s);
721                         if (ret <= 0) goto end;
722                         s->state=SSL3_ST_SW_CHANGE_A;
723                         s->init_num=0;
724                         break;
725
726                 case SSL3_ST_SW_CERT_STATUS_A:
727                 case SSL3_ST_SW_CERT_STATUS_B:
728                         ret=ssl3_send_cert_status(s);
729                         if (ret <= 0) goto end;
730                         s->state=SSL3_ST_SW_KEY_EXCH_A;
731                         s->init_num=0;
732                         break;
733
734 #endif
735
736                 case SSL3_ST_SW_CHANGE_A:
737                 case SSL3_ST_SW_CHANGE_B:
738
739                         s->session->cipher=s->s3->tmp.new_cipher;
740                         if (!s->method->ssl3_enc->setup_key_block(s))
741                                 { ret= -1; goto end; }
742
743                         ret=ssl3_send_change_cipher_spec(s,
744                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
745
746                         if (ret <= 0) goto end;
747                         s->state=SSL3_ST_SW_FINISHED_A;
748                         s->init_num=0;
749
750                         if (!s->method->ssl3_enc->change_cipher_state(s,
751                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
752                                 {
753                                 ret= -1;
754                                 goto end;
755                                 }
756
757                         break;
758
759                 case SSL3_ST_SW_FINISHED_A:
760                 case SSL3_ST_SW_FINISHED_B:
761                         ret=ssl3_send_finished(s,
762                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
763                                 s->method->ssl3_enc->server_finished_label,
764                                 s->method->ssl3_enc->server_finished_label_len);
765                         if (ret <= 0) goto end;
766                         s->state=SSL3_ST_SW_FLUSH;
767                         if (s->hit)
768                                 {
769 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
770                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
771 #else
772                                 if (s->s3->next_proto_neg_seen)
773                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
774                                 else
775                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
776 #endif
777                                 }
778                         else
779                                 s->s3->tmp.next_state=SSL_ST_OK;
780                         s->init_num=0;
781                         break;
782
783                 case SSL_ST_OK:
784                         /* clean a few things up */
785                         ssl3_cleanup_key_block(s);
786
787                         BUF_MEM_free(s->init_buf);
788                         s->init_buf=NULL;
789
790                         /* remove buffering on output */
791                         ssl_free_wbio_buffer(s);
792
793                         s->init_num=0;
794
795                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
796                                 {
797                                 s->renegotiate=0;
798                                 s->new_session=0;
799                                 
800                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
801                                 
802                                 s->ctx->stats.sess_accept_good++;
803                                 /* s->server=1; */
804                                 s->handshake_func=ssl3_accept;
805
806                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
807                                 }
808                         
809                         ret = 1;
810                         goto end;
811                         /* break; */
812
813                 default:
814                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
815                         ret= -1;
816                         goto end;
817                         /* break; */
818                         }
819                 
820                 if (!s->s3->tmp.reuse_message && !skip)
821                         {
822                         if (s->debug)
823                                 {
824                                 if ((ret=BIO_flush(s->wbio)) <= 0)
825                                         goto end;
826                                 }
827
828
829                         if ((cb != NULL) && (s->state != state))
830                                 {
831                                 new_state=s->state;
832                                 s->state=state;
833                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
834                                 s->state=new_state;
835                                 }
836                         }
837                 skip=0;
838                 }
839 end:
840         /* BIO_flush(s->wbio); */
841
842         s->in_handshake--;
843         if (cb != NULL)
844                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
845         return(ret);
846         }
847
848 int ssl3_send_hello_request(SSL *s)
849         {
850         unsigned char *p;
851
852         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
853                 {
854                 p=(unsigned char *)s->init_buf->data;
855                 *(p++)=SSL3_MT_HELLO_REQUEST;
856                 *(p++)=0;
857                 *(p++)=0;
858                 *(p++)=0;
859
860                 s->state=SSL3_ST_SW_HELLO_REQ_B;
861                 /* number of bytes to write */
862                 s->init_num=4;
863                 s->init_off=0;
864                 }
865
866         /* SSL3_ST_SW_HELLO_REQ_B */
867         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
868         }
869
870 int ssl3_check_client_hello(SSL *s)
871         {
872         int ok;
873         long n;
874
875         /* We only allow the client to restart the handshake once per
876          * negotiation. */
877         if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
878                 {
879                 SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
880                 return -1;
881                 }
882
883         /* this function is called when we really expect a Certificate message,
884          * so permit appropriate message length */
885         n=s->method->ssl_get_message(s,
886                 SSL3_ST_SR_CERT_A,
887                 SSL3_ST_SR_CERT_B,
888                 -1,
889                 s->max_cert_list,
890                 &ok);
891         if (!ok) return((int)n);
892         s->s3->tmp.reuse_message = 1;
893         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
894                 {
895                 /* Throw away what we have done so far in the current handshake,
896                  * which will now be aborted. (A full SSL_clear would be too much.) */
897 #ifndef OPENSSL_NO_DH
898                 if (s->s3->tmp.dh != NULL)
899                         {
900                         DH_free(s->s3->tmp.dh);
901                         s->s3->tmp.dh = NULL;
902                         }
903 #endif
904 #ifndef OPENSSL_NO_ECDH
905                 if (s->s3->tmp.ecdh != NULL)
906                         {
907                         EC_KEY_free(s->s3->tmp.ecdh);
908                         s->s3->tmp.ecdh = NULL;
909                         }
910 #endif
911                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
912                 return 2;
913                 }
914         return 1;
915 }
916
917 int ssl3_get_client_hello(SSL *s)
918         {
919         int i,j,ok,al,ret= -1;
920         unsigned int cookie_len;
921         long n;
922         unsigned long id;
923         unsigned char *p,*d,*q;
924         SSL_CIPHER *c;
925 #ifndef OPENSSL_NO_COMP
926         SSL_COMP *comp=NULL;
927 #endif
928         STACK_OF(SSL_CIPHER) *ciphers=NULL;
929
930         /* We do this so that we will respond with our native type.
931          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
932          * This down switching should be handled by a different method.
933          * If we are SSLv3, we will respond with SSLv3, even if prompted with
934          * TLSv1.
935          */
936         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
937                 )
938                 {
939                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
940                 }
941         s->first_packet=1;
942         n=s->method->ssl_get_message(s,
943                 SSL3_ST_SR_CLNT_HELLO_B,
944                 SSL3_ST_SR_CLNT_HELLO_C,
945                 SSL3_MT_CLIENT_HELLO,
946                 SSL3_RT_MAX_PLAIN_LENGTH,
947                 &ok);
948
949         if (!ok) return((int)n);
950         s->first_packet=0;
951         d=p=(unsigned char *)s->init_msg;
952
953         /* use version from inside client hello, not from record header
954          * (may differ: see RFC 2246, Appendix E, second paragraph) */
955         s->client_version=(((int)p[0])<<8)|(int)p[1];
956         p+=2;
957
958         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
959             (s->version != DTLS1_VERSION && s->client_version < s->version))
960                 {
961                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
962                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
963                         {
964                         /* similar to ssl3_get_record, send alert using remote version number */
965                         s->version = s->client_version;
966                         }
967                 al = SSL_AD_PROTOCOL_VERSION;
968                 goto f_err;
969                 }
970
971         /* If we require cookies and this ClientHello doesn't
972          * contain one, just return since we do not want to
973          * allocate any memory yet. So check cookie length...
974          */
975         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
976                 {
977                 unsigned int session_length, cookie_length;
978                 
979                 session_length = *(p + SSL3_RANDOM_SIZE);
980                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
981
982                 if (cookie_length == 0)
983                         return 1;
984                 }
985
986         /* load the client random */
987         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
988         p+=SSL3_RANDOM_SIZE;
989
990         /* get the session-id */
991         j= *(p++);
992
993         s->hit=0;
994         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
995          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
996          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
997          * than a change to default behavior so that applications relying on this for security
998          * won't even compile against older library versions).
999          *
1000          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1001          * renegotiation but not a new session (s->new_session remains unset): for servers,
1002          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1003          * setting will be ignored.
1004          */
1005         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1006                 {
1007                 if (!ssl_get_new_session(s,1))
1008                         goto err;
1009                 }
1010         else
1011                 {
1012                 i=ssl_get_prev_session(s, p, j, d + n);
1013                 if (i == 1)
1014                         { /* previous session */
1015                         s->hit=1;
1016                         }
1017                 else if (i == -1)
1018                         goto err;
1019                 else /* i == 0 */
1020                         {
1021                         if (!ssl_get_new_session(s,1))
1022                                 goto err;
1023                         }
1024                 }
1025
1026         p+=j;
1027
1028         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1029                 {
1030                 /* cookie stuff */
1031                 cookie_len = *(p++);
1032
1033                 /* 
1034                  * The ClientHello may contain a cookie even if the
1035                  * HelloVerify message has not been sent--make sure that it
1036                  * does not cause an overflow.
1037                  */
1038                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1039                         {
1040                         /* too much data */
1041                         al = SSL_AD_DECODE_ERROR;
1042                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1043                         goto f_err;
1044                         }
1045
1046                 /* verify the cookie if appropriate option is set. */
1047                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1048                         cookie_len > 0)
1049                         {
1050                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1051
1052                         if ( s->ctx->app_verify_cookie_cb != NULL)
1053                                 {
1054                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1055                                         cookie_len) == 0)
1056                                         {
1057                                         al=SSL_AD_HANDSHAKE_FAILURE;
1058                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1059                                                 SSL_R_COOKIE_MISMATCH);
1060                                         goto f_err;
1061                                         }
1062                                 /* else cookie verification succeeded */
1063                                 }
1064                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1065                                                   s->d1->cookie_len) != 0) /* default verification */
1066                                 {
1067                                         al=SSL_AD_HANDSHAKE_FAILURE;
1068                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1069                                                 SSL_R_COOKIE_MISMATCH);
1070                                         goto f_err;
1071                                 }
1072
1073                         ret = 2;
1074                         }
1075
1076                 p += cookie_len;
1077                 }
1078
1079         n2s(p,i);
1080         if ((i == 0) && (j != 0))
1081                 {
1082                 /* we need a cipher if we are not resuming a session */
1083                 al=SSL_AD_ILLEGAL_PARAMETER;
1084                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1085                 goto f_err;
1086                 }
1087         if ((p+i) >= (d+n))
1088                 {
1089                 /* not enough data */
1090                 al=SSL_AD_DECODE_ERROR;
1091                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1092                 goto f_err;
1093                 }
1094         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1095                 == NULL))
1096                 {
1097                 goto err;
1098                 }
1099         p+=i;
1100
1101         /* If it is a hit, check that the cipher is in the list */
1102         if ((s->hit) && (i > 0))
1103                 {
1104                 j=0;
1105                 id=s->session->cipher->id;
1106
1107 #ifdef CIPHER_DEBUG
1108                 printf("client sent %d ciphers\n",sk_num(ciphers));
1109 #endif
1110                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1111                         {
1112                         c=sk_SSL_CIPHER_value(ciphers,i);
1113 #ifdef CIPHER_DEBUG
1114                         printf("client [%2d of %2d]:%s\n",
1115                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1116 #endif
1117                         if (c->id == id)
1118                                 {
1119                                 j=1;
1120                                 break;
1121                                 }
1122                         }
1123 /* Disabled because it can be used in a ciphersuite downgrade
1124  * attack: CVE-2010-4180.
1125  */
1126 #if 0
1127                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1128                         {
1129                         /* Special case as client bug workaround: the previously used cipher may
1130                          * not be in the current list, the client instead might be trying to
1131                          * continue using a cipher that before wasn't chosen due to server
1132                          * preferences.  We'll have to reject the connection if the cipher is not
1133                          * enabled, though. */
1134                         c = sk_SSL_CIPHER_value(ciphers, 0);
1135                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1136                                 {
1137                                 s->session->cipher = c;
1138                                 j = 1;
1139                                 }
1140                         }
1141 #endif
1142                 if (j == 0)
1143                         {
1144                         /* we need to have the cipher in the cipher
1145                          * list if we are asked to reuse it */
1146                         al=SSL_AD_ILLEGAL_PARAMETER;
1147                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1148                         goto f_err;
1149                         }
1150                 }
1151
1152         /* compression */
1153         i= *(p++);
1154         if ((p+i) > (d+n))
1155                 {
1156                 /* not enough data */
1157                 al=SSL_AD_DECODE_ERROR;
1158                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1159                 goto f_err;
1160                 }
1161         q=p;
1162         for (j=0; j<i; j++)
1163                 {
1164                 if (p[j] == 0) break;
1165                 }
1166
1167         p+=i;
1168         if (j >= i)
1169                 {
1170                 /* no compress */
1171                 al=SSL_AD_DECODE_ERROR;
1172                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1173                 goto f_err;
1174                 }
1175
1176 #ifndef OPENSSL_NO_TLSEXT
1177         /* TLS extensions*/
1178         if (s->version >= SSL3_VERSION)
1179                 {
1180                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1181                         {
1182                         /* 'al' set by ssl_parse_clienthello_tlsext */
1183                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1184                         goto f_err;
1185                         }
1186                 }
1187                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1188                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1189                         goto err;
1190                 }
1191
1192         /* Check if we want to use external pre-shared secret for this
1193          * handshake for not reused session only. We need to generate
1194          * server_random before calling tls_session_secret_cb in order to allow
1195          * SessionTicket processing to use it in key derivation. */
1196         {
1197                 unsigned long Time;
1198                 unsigned char *pos;
1199                 Time=(unsigned long)time(NULL);                 /* Time */
1200                 pos=s->s3->server_random;
1201                 l2n(Time,pos);
1202                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1203                         {
1204                         al=SSL_AD_INTERNAL_ERROR;
1205                         goto f_err;
1206                         }
1207         }
1208
1209         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1210                 {
1211                 SSL_CIPHER *pref_cipher=NULL;
1212
1213                 s->session->master_key_length=sizeof(s->session->master_key);
1214                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1215                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1216                         {
1217                         s->hit=1;
1218                         s->session->ciphers=ciphers;
1219                         s->session->verify_result=X509_V_OK;
1220
1221                         ciphers=NULL;
1222
1223                         /* check if some cipher was preferred by call back */
1224                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1225                         if (pref_cipher == NULL)
1226                                 {
1227                                 al=SSL_AD_HANDSHAKE_FAILURE;
1228                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1229                                 goto f_err;
1230                                 }
1231
1232                         s->session->cipher=pref_cipher;
1233
1234                         if (s->cipher_list)
1235                                 sk_SSL_CIPHER_free(s->cipher_list);
1236
1237                         if (s->cipher_list_by_id)
1238                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1239
1240                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1241                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1242                         }
1243                 }
1244 #endif
1245
1246         /* Worst case, we will use the NULL compression, but if we have other
1247          * options, we will now look for them.  We have i-1 compression
1248          * algorithms from the client, starting at q. */
1249         s->s3->tmp.new_compression=NULL;
1250 #ifndef OPENSSL_NO_COMP
1251         /* This only happens if we have a cache hit */
1252         if (s->session->compress_meth != 0)
1253                 {
1254                 int m, comp_id = s->session->compress_meth;
1255                 /* Perform sanity checks on resumed compression algorithm */
1256                 /* Can't disable compression */
1257                 if (s->options & SSL_OP_NO_COMPRESSION)
1258                         {
1259                         al=SSL_AD_INTERNAL_ERROR;
1260                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1261                         goto f_err;
1262                         }
1263                 /* Look for resumed compression method */
1264                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1265                         {
1266                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1267                         if (comp_id == comp->id)
1268                                 {
1269                                 s->s3->tmp.new_compression=comp;
1270                                 break;
1271                                 }
1272                         }
1273                 if (s->s3->tmp.new_compression == NULL)
1274                         {
1275                         al=SSL_AD_INTERNAL_ERROR;
1276                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1277                         goto f_err;
1278                         }
1279                 /* Look for resumed method in compression list */
1280                 for (m = 0; m < i; m++)
1281                         {
1282                         if (q[m] == comp_id)
1283                                 break;
1284                         }
1285                 if (m >= i)
1286                         {
1287                         al=SSL_AD_ILLEGAL_PARAMETER;
1288                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1289                         goto f_err;
1290                         }
1291                 }
1292         else if (s->hit)
1293                 comp = NULL;
1294         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1295                 { /* See if we have a match */
1296                 int m,nn,o,v,done=0;
1297
1298                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1299                 for (m=0; m<nn; m++)
1300                         {
1301                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1302                         v=comp->id;
1303                         for (o=0; o<i; o++)
1304                                 {
1305                                 if (v == q[o])
1306                                         {
1307                                         done=1;
1308                                         break;
1309                                         }
1310                                 }
1311                         if (done) break;
1312                         }
1313                 if (done)
1314                         s->s3->tmp.new_compression=comp;
1315                 else
1316                         comp=NULL;
1317                 }
1318 #else
1319         /* If compression is disabled we'd better not try to resume a session
1320          * using compression.
1321          */
1322         if (s->session->compress_meth != 0)
1323                 {
1324                 al=SSL_AD_INTERNAL_ERROR;
1325                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1326                 goto f_err;
1327                 }
1328 #endif
1329
1330         /* Given s->session->ciphers and SSL_get_ciphers, we must
1331          * pick a cipher */
1332
1333         if (!s->hit)
1334                 {
1335 #ifdef OPENSSL_NO_COMP
1336                 s->session->compress_meth=0;
1337 #else
1338                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1339 #endif
1340                 if (s->session->ciphers != NULL)
1341                         sk_SSL_CIPHER_free(s->session->ciphers);
1342                 s->session->ciphers=ciphers;
1343                 if (ciphers == NULL)
1344                         {
1345                         al=SSL_AD_ILLEGAL_PARAMETER;
1346                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1347                         goto f_err;
1348                         }
1349                 ciphers=NULL;
1350                 c=ssl3_choose_cipher(s,s->session->ciphers,
1351                                      SSL_get_ciphers(s));
1352
1353                 if (c == NULL)
1354                         {
1355                         al=SSL_AD_HANDSHAKE_FAILURE;
1356                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1357                         goto f_err;
1358                         }
1359                 s->s3->tmp.new_cipher=c;
1360                 /* check whether we should disable session resumption */
1361                 if (s->not_resumable_session_cb != NULL)
1362                         s->session->not_resumable=s->not_resumable_session_cb(s,
1363                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1364                 if (s->session->not_resumable)
1365                         /* do not send a session ticket */
1366                         s->tlsext_ticket_expected = 0;
1367                 }
1368         else
1369                 {
1370                 /* Session-id reuse */
1371 #ifdef REUSE_CIPHER_BUG
1372                 STACK_OF(SSL_CIPHER) *sk;
1373                 SSL_CIPHER *nc=NULL;
1374                 SSL_CIPHER *ec=NULL;
1375
1376                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1377                         {
1378                         sk=s->session->ciphers;
1379                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1380                                 {
1381                                 c=sk_SSL_CIPHER_value(sk,i);
1382                                 if (c->algorithm_enc & SSL_eNULL)
1383                                         nc=c;
1384                                 if (SSL_C_IS_EXPORT(c))
1385                                         ec=c;
1386                                 }
1387                         if (nc != NULL)
1388                                 s->s3->tmp.new_cipher=nc;
1389                         else if (ec != NULL)
1390                                 s->s3->tmp.new_cipher=ec;
1391                         else
1392                                 s->s3->tmp.new_cipher=s->session->cipher;
1393                         }
1394                 else
1395 #endif
1396                 s->s3->tmp.new_cipher=s->session->cipher;
1397                 }
1398
1399         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1400                 {
1401                 if (!ssl3_digest_cached_records(s))
1402                         goto f_err;
1403                 }
1404         
1405         /* we now have the following setup. 
1406          * client_random
1407          * cipher_list          - our prefered list of ciphers
1408          * ciphers              - the clients prefered list of ciphers
1409          * compression          - basically ignored right now
1410          * ssl version is set   - sslv3
1411          * s->session           - The ssl session has been setup.
1412          * s->hit               - session reuse flag
1413          * s->tmp.new_cipher    - the new cipher to use.
1414          */
1415
1416         if (ret < 0) ret=1;
1417         if (0)
1418                 {
1419 f_err:
1420                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1421                 }
1422 err:
1423         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1424         return(ret);
1425         }
1426
1427 int ssl3_send_server_hello(SSL *s)
1428         {
1429         unsigned char *buf;
1430         unsigned char *p,*d;
1431         int i,sl;
1432         unsigned long l;
1433 #ifdef OPENSSL_NO_TLSEXT
1434         unsigned long Time;
1435 #endif
1436
1437         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1438                 {
1439                 buf=(unsigned char *)s->init_buf->data;
1440 #ifdef OPENSSL_NO_TLSEXT
1441                 p=s->s3->server_random;
1442                 /* Generate server_random if it was not needed previously */
1443                 Time=(unsigned long)time(NULL);                 /* Time */
1444                 l2n(Time,p);
1445                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1446                         return -1;
1447 #endif
1448                 /* Do the message type and length last */
1449                 d=p= &(buf[4]);
1450
1451                 *(p++)=s->version>>8;
1452                 *(p++)=s->version&0xff;
1453
1454                 /* Random stuff */
1455                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1456                 p+=SSL3_RANDOM_SIZE;
1457
1458                 /* There are several cases for the session ID to send
1459                  * back in the server hello:
1460                  * - For session reuse from the session cache,
1461                  *   we send back the old session ID.
1462                  * - If stateless session reuse (using a session ticket)
1463                  *   is successful, we send back the client's "session ID"
1464                  *   (which doesn't actually identify the session).
1465                  * - If it is a new session, we send back the new
1466                  *   session ID.
1467                  * - However, if we want the new session to be single-use,
1468                  *   we send back a 0-length session ID.
1469                  * s->hit is non-zero in either case of session reuse,
1470                  * so the following won't overwrite an ID that we're supposed
1471                  * to send back.
1472                  */
1473                 if (s->session->not_resumable ||
1474                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1475                                 && !s->hit))
1476                         s->session->session_id_length=0;
1477
1478                 sl=s->session->session_id_length;
1479                 if (sl > (int)sizeof(s->session->session_id))
1480                         {
1481                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1482                         return -1;
1483                         }
1484                 *(p++)=sl;
1485                 memcpy(p,s->session->session_id,sl);
1486                 p+=sl;
1487
1488                 /* put the cipher */
1489                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1490                 p+=i;
1491
1492                 /* put the compression method */
1493 #ifdef OPENSSL_NO_COMP
1494                         *(p++)=0;
1495 #else
1496                 if (s->s3->tmp.new_compression == NULL)
1497                         *(p++)=0;
1498                 else
1499                         *(p++)=s->s3->tmp.new_compression->id;
1500 #endif
1501 #ifndef OPENSSL_NO_TLSEXT
1502                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1503                         {
1504                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1505                         return -1;
1506                         }
1507                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1508                         {
1509                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1510                         return -1;
1511                         }
1512 #endif
1513                 /* do the header */
1514                 l=(p-d);
1515                 d=buf;
1516                 *(d++)=SSL3_MT_SERVER_HELLO;
1517                 l2n3(l,d);
1518
1519                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1520                 /* number of bytes to write */
1521                 s->init_num=p-buf;
1522                 s->init_off=0;
1523                 }
1524
1525         /* SSL3_ST_SW_SRVR_HELLO_B */
1526         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1527         }
1528
1529 int ssl3_send_server_done(SSL *s)
1530         {
1531         unsigned char *p;
1532
1533         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1534                 {
1535                 p=(unsigned char *)s->init_buf->data;
1536
1537                 /* do the header */
1538                 *(p++)=SSL3_MT_SERVER_DONE;
1539                 *(p++)=0;
1540                 *(p++)=0;
1541                 *(p++)=0;
1542
1543                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1544                 /* number of bytes to write */
1545                 s->init_num=4;
1546                 s->init_off=0;
1547                 }
1548
1549         /* SSL3_ST_SW_SRVR_DONE_B */
1550         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1551         }
1552
1553 int ssl3_send_server_key_exchange(SSL *s)
1554         {
1555 #ifndef OPENSSL_NO_RSA
1556         unsigned char *q;
1557         int j,num;
1558         RSA *rsa;
1559         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1560         unsigned int u;
1561 #endif
1562 #ifndef OPENSSL_NO_DH
1563         DH *dh=NULL,*dhp;
1564 #endif
1565 #ifndef OPENSSL_NO_ECDH
1566         EC_KEY *ecdh=NULL, *ecdhp;
1567         unsigned char *encodedPoint = NULL;
1568         int encodedlen = 0;
1569         int curve_id = 0;
1570         BN_CTX *bn_ctx = NULL; 
1571 #endif
1572         EVP_PKEY *pkey;
1573         const EVP_MD *md = NULL;
1574         unsigned char *p,*d;
1575         int al,i;
1576         unsigned long type;
1577         int n;
1578         CERT *cert;
1579         BIGNUM *r[4];
1580         int nr[4],kn;
1581         BUF_MEM *buf;
1582         EVP_MD_CTX md_ctx;
1583
1584         EVP_MD_CTX_init(&md_ctx);
1585         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1586                 {
1587                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1588                 cert=s->cert;
1589
1590                 buf=s->init_buf;
1591
1592                 r[0]=r[1]=r[2]=r[3]=NULL;
1593                 n=0;
1594 #ifndef OPENSSL_NO_RSA
1595                 if (type & SSL_kRSA)
1596                         {
1597                         rsa=cert->rsa_tmp;
1598                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1599                                 {
1600                                 rsa=s->cert->rsa_tmp_cb(s,
1601                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1602                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1603                                 if(rsa == NULL)
1604                                 {
1605                                         al=SSL_AD_HANDSHAKE_FAILURE;
1606                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1607                                         goto f_err;
1608                                 }
1609                                 RSA_up_ref(rsa);
1610                                 cert->rsa_tmp=rsa;
1611                                 }
1612                         if (rsa == NULL)
1613                                 {
1614                                 al=SSL_AD_HANDSHAKE_FAILURE;
1615                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1616                                 goto f_err;
1617                                 }
1618                         r[0]=rsa->n;
1619                         r[1]=rsa->e;
1620                         s->s3->tmp.use_rsa_tmp=1;
1621                         }
1622                 else
1623 #endif
1624 #ifndef OPENSSL_NO_DH
1625                         if (type & SSL_kEDH)
1626                         {
1627                         dhp=cert->dh_tmp;
1628                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1629                                 dhp=s->cert->dh_tmp_cb(s,
1630                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1631                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1632                         if (dhp == NULL)
1633                                 {
1634                                 al=SSL_AD_HANDSHAKE_FAILURE;
1635                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1636                                 goto f_err;
1637                                 }
1638
1639                         if (s->s3->tmp.dh != NULL)
1640                                 {
1641                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1642                                 goto err;
1643                                 }
1644
1645                         if ((dh=DHparams_dup(dhp)) == NULL)
1646                                 {
1647                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1648                                 goto err;
1649                                 }
1650
1651                         s->s3->tmp.dh=dh;
1652                         if ((dhp->pub_key == NULL ||
1653                              dhp->priv_key == NULL ||
1654                              (s->options & SSL_OP_SINGLE_DH_USE)))
1655                                 {
1656                                 if(!DH_generate_key(dh))
1657                                     {
1658                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1659                                            ERR_R_DH_LIB);
1660                                     goto err;
1661                                     }
1662                                 }
1663                         else
1664                                 {
1665                                 dh->pub_key=BN_dup(dhp->pub_key);
1666                                 dh->priv_key=BN_dup(dhp->priv_key);
1667                                 if ((dh->pub_key == NULL) ||
1668                                         (dh->priv_key == NULL))
1669                                         {
1670                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1671                                         goto err;
1672                                         }
1673                                 }
1674                         r[0]=dh->p;
1675                         r[1]=dh->g;
1676                         r[2]=dh->pub_key;
1677                         }
1678                 else 
1679 #endif
1680 #ifndef OPENSSL_NO_ECDH
1681                         if (type & SSL_kEECDH)
1682                         {
1683                         const EC_GROUP *group;
1684
1685                         ecdhp=cert->ecdh_tmp;
1686                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1687                                 {
1688                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1689                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1690                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1691                                 }
1692                         if (ecdhp == NULL)
1693                                 {
1694                                 al=SSL_AD_HANDSHAKE_FAILURE;
1695                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1696                                 goto f_err;
1697                                 }
1698
1699                         if (s->s3->tmp.ecdh != NULL)
1700                                 {
1701                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1702                                 goto err;
1703                                 }
1704
1705                         /* Duplicate the ECDH structure. */
1706                         if (ecdhp == NULL)
1707                                 {
1708                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1709                                 goto err;
1710                                 }
1711                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1712                                 {
1713                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1714                                 goto err;
1715                                 }
1716
1717                         s->s3->tmp.ecdh=ecdh;
1718                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1719                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1720                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1721                                 {
1722                                 if(!EC_KEY_generate_key(ecdh))
1723                                     {
1724                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1725                                     goto err;
1726                                     }
1727                                 }
1728
1729                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1730                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1731                             (EC_KEY_get0_private_key(ecdh) == NULL))
1732                                 {
1733                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1734                                 goto err;
1735                                 }
1736
1737                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1738                             (EC_GROUP_get_degree(group) > 163)) 
1739                                 {
1740                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1741                                 goto err;
1742                                 }
1743
1744                         /* XXX: For now, we only support ephemeral ECDH
1745                          * keys over named (not generic) curves. For 
1746                          * supported named curves, curve_id is non-zero.
1747                          */
1748                         if ((curve_id = 
1749                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1750                             == 0)
1751                                 {
1752                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1753                                 goto err;
1754                                 }
1755
1756                         /* Encode the public key.
1757                          * First check the size of encoding and
1758                          * allocate memory accordingly.
1759                          */
1760                         encodedlen = EC_POINT_point2oct(group, 
1761                             EC_KEY_get0_public_key(ecdh),
1762                             POINT_CONVERSION_UNCOMPRESSED, 
1763                             NULL, 0, NULL);
1764
1765                         encodedPoint = (unsigned char *) 
1766                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1767                         bn_ctx = BN_CTX_new();
1768                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1769                                 {
1770                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1771                                 goto err;
1772                                 }
1773
1774
1775                         encodedlen = EC_POINT_point2oct(group, 
1776                             EC_KEY_get0_public_key(ecdh), 
1777                             POINT_CONVERSION_UNCOMPRESSED, 
1778                             encodedPoint, encodedlen, bn_ctx);
1779
1780                         if (encodedlen == 0) 
1781                                 {
1782                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1783                                 goto err;
1784                                 }
1785
1786                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1787
1788                         /* XXX: For now, we only support named (not 
1789                          * generic) curves in ECDH ephemeral key exchanges.
1790                          * In this situation, we need four additional bytes
1791                          * to encode the entire ServerECDHParams
1792                          * structure. 
1793                          */
1794                         n = 4 + encodedlen;
1795
1796                         /* We'll generate the serverKeyExchange message
1797                          * explicitly so we can set these to NULLs
1798                          */
1799                         r[0]=NULL;
1800                         r[1]=NULL;
1801                         r[2]=NULL;
1802                         r[3]=NULL;
1803                         }
1804                 else 
1805 #endif /* !OPENSSL_NO_ECDH */
1806 #ifndef OPENSSL_NO_PSK
1807                         if (type & SSL_kPSK)
1808                                 {
1809                                 /* reserve size for record length and PSK identity hint*/
1810                                 n+=2+strlen(s->ctx->psk_identity_hint);
1811                                 }
1812                         else
1813 #endif /* !OPENSSL_NO_PSK */
1814 #ifndef OPENSSL_NO_SRP
1815                 if (type & SSL_kSRP)
1816                         {
1817                         if ((s->srp_ctx.N == NULL) ||
1818                                 (s->srp_ctx.g == NULL) ||
1819                                 (s->srp_ctx.s == NULL) ||
1820                                 (s->srp_ctx.B == NULL))
1821                                 {
1822                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1823                                 goto err;
1824                                 }
1825                         r[0]=s->srp_ctx.N;
1826                         r[1]=s->srp_ctx.g;
1827                         r[2]=s->srp_ctx.s;
1828                         r[3]=s->srp_ctx.B;
1829                         }
1830                 else 
1831 #endif
1832                         {
1833                         al=SSL_AD_HANDSHAKE_FAILURE;
1834                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1835                         goto f_err;
1836                         }
1837                 for (i=0; r[i] != NULL && i<4; i++)
1838                         {
1839                         nr[i]=BN_num_bytes(r[i]);
1840 #ifndef OPENSSL_NO_SRP
1841                         if ((i == 2) && (type & SSL_kSRP))
1842                                 n+=1+nr[i];
1843                         else
1844 #endif
1845                         n+=2+nr[i];
1846                         }
1847
1848                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1849                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1850                         {
1851                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1852                                 == NULL)
1853                                 {
1854                                 al=SSL_AD_DECODE_ERROR;
1855                                 goto f_err;
1856                                 }
1857                         kn=EVP_PKEY_size(pkey);
1858                         }
1859                 else
1860                         {
1861                         pkey=NULL;
1862                         kn=0;
1863                         }
1864
1865                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1866                         {
1867                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1868                         goto err;
1869                         }
1870                 d=(unsigned char *)s->init_buf->data;
1871                 p= &(d[4]);
1872
1873                 for (i=0; r[i] != NULL && i<4; i++)
1874                         {
1875 #ifndef OPENSSL_NO_SRP
1876                         if ((i == 2) && (type & SSL_kSRP))
1877                                 {
1878                                 *p = nr[i];
1879                                 p++;
1880                                 }
1881                         else
1882 #endif
1883                         s2n(nr[i],p);
1884                         BN_bn2bin(r[i],p);
1885                         p+=nr[i];
1886                         }
1887
1888 #ifndef OPENSSL_NO_ECDH
1889                 if (type & SSL_kEECDH) 
1890                         {
1891                         /* XXX: For now, we only support named (not generic) curves.
1892                          * In this situation, the serverKeyExchange message has:
1893                          * [1 byte CurveType], [2 byte CurveName]
1894                          * [1 byte length of encoded point], followed by
1895                          * the actual encoded point itself
1896                          */
1897                         *p = NAMED_CURVE_TYPE;
1898                         p += 1;
1899                         *p = 0;
1900                         p += 1;
1901                         *p = curve_id;
1902                         p += 1;
1903                         *p = encodedlen;
1904                         p += 1;
1905                         memcpy((unsigned char*)p, 
1906                             (unsigned char *)encodedPoint, 
1907                             encodedlen);
1908                         OPENSSL_free(encodedPoint);
1909                         encodedPoint = NULL;
1910                         p += encodedlen;
1911                         }
1912 #endif
1913
1914 #ifndef OPENSSL_NO_PSK
1915                 if (type & SSL_kPSK)
1916                         {
1917                         /* copy PSK identity hint */
1918                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1919                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1920                         p+=strlen(s->ctx->psk_identity_hint);
1921                         }
1922 #endif
1923
1924                 /* not anonymous */
1925                 if (pkey != NULL)
1926                         {
1927                         /* n is the length of the params, they start at &(d[4])
1928                          * and p points to the space at the end. */
1929 #ifndef OPENSSL_NO_RSA
1930                         if (pkey->type == EVP_PKEY_RSA
1931                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1932                                 {
1933                                 q=md_buf;
1934                                 j=0;
1935                                 for (num=2; num > 0; num--)
1936                                         {
1937                                         EVP_MD_CTX_set_flags(&md_ctx,
1938                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1939                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1940                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1941                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1942                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1943                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1944                                         EVP_DigestFinal_ex(&md_ctx,q,
1945                                                 (unsigned int *)&i);
1946                                         q+=i;
1947                                         j+=i;
1948                                         }
1949                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1950                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1951                                         {
1952                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1953                                         goto err;
1954                                         }
1955                                 s2n(u,p);
1956                                 n+=u+2;
1957                                 }
1958                         else
1959 #endif
1960                         if (md)
1961                                 {
1962                                 /* For TLS1.2 and later send signature
1963                                  * algorithm */
1964                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1965                                         {
1966                                         if (!tls12_get_sigandhash(p, pkey, md))
1967                                                 {
1968                                                 /* Should never happen */
1969                                                 al=SSL_AD_INTERNAL_ERROR;
1970                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1971                                                 goto f_err;
1972                                                 }
1973                                         p+=2;
1974                                         }
1975 #ifdef SSL_DEBUG
1976                                 fprintf(stderr, "Using hash %s\n",
1977                                                         EVP_MD_name(md));
1978 #endif
1979                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1980                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1981                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1982                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1983                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1984                                         (unsigned int *)&i,pkey))
1985                                         {
1986                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1987                                         goto err;
1988                                         }
1989                                 s2n(i,p);
1990                                 n+=i+2;
1991                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1992                                         n+= 2;
1993                                 }
1994                         else
1995                                 {
1996                                 /* Is this error check actually needed? */
1997                                 al=SSL_AD_HANDSHAKE_FAILURE;
1998                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1999                                 goto f_err;
2000                                 }
2001                         }
2002
2003                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2004                 l2n3(n,d);
2005
2006                 /* we should now have things packed up, so lets send
2007                  * it off */
2008                 s->init_num=n+4;
2009                 s->init_off=0;
2010                 }
2011
2012         s->state = SSL3_ST_SW_KEY_EXCH_B;
2013         EVP_MD_CTX_cleanup(&md_ctx);
2014         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2015 f_err:
2016         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2017 err:
2018 #ifndef OPENSSL_NO_ECDH
2019         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2020         BN_CTX_free(bn_ctx);
2021 #endif
2022         EVP_MD_CTX_cleanup(&md_ctx);
2023         return(-1);
2024         }
2025
2026 int ssl3_send_certificate_request(SSL *s)
2027         {
2028         unsigned char *p,*d;
2029         int i,j,nl,off,n;
2030         STACK_OF(X509_NAME) *sk=NULL;
2031         X509_NAME *name;
2032         BUF_MEM *buf;
2033
2034         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2035                 {
2036                 buf=s->init_buf;
2037
2038                 d=p=(unsigned char *)&(buf->data[4]);
2039
2040                 /* get the list of acceptable cert types */
2041                 p++;
2042                 n=ssl3_get_req_cert_type(s,p);
2043                 d[0]=n;
2044                 p+=n;
2045                 n++;
2046
2047                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2048                         {
2049                         nl = tls12_get_req_sig_algs(s, p + 2);
2050                         s2n(nl, p);
2051                         p += nl + 2;
2052                         n += nl + 2;
2053                         }
2054
2055                 off=n;
2056                 p+=2;
2057                 n+=2;
2058
2059                 sk=SSL_get_client_CA_list(s);
2060                 nl=0;
2061                 if (sk != NULL)
2062                         {
2063                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2064                                 {
2065                                 name=sk_X509_NAME_value(sk,i);
2066                                 j=i2d_X509_NAME(name,NULL);
2067                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2068                                         {
2069                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2070                                         goto err;
2071                                         }
2072                                 p=(unsigned char *)&(buf->data[4+n]);
2073                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2074                                         {
2075                                         s2n(j,p);
2076                                         i2d_X509_NAME(name,&p);
2077                                         n+=2+j;
2078                                         nl+=2+j;
2079                                         }
2080                                 else
2081                                         {
2082                                         d=p;
2083                                         i2d_X509_NAME(name,&p);
2084                                         j-=2; s2n(j,d); j+=2;
2085                                         n+=j;
2086                                         nl+=j;
2087                                         }
2088                                 }
2089                         }
2090                 /* else no CA names */
2091                 p=(unsigned char *)&(buf->data[4+off]);
2092                 s2n(nl,p);
2093
2094                 d=(unsigned char *)buf->data;
2095                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2096                 l2n3(n,d);
2097
2098                 /* we should now have things packed up, so lets send
2099                  * it off */
2100
2101                 s->init_num=n+4;
2102                 s->init_off=0;
2103 #ifdef NETSCAPE_HANG_BUG
2104                 p=(unsigned char *)s->init_buf->data + s->init_num;
2105
2106                 /* do the header */
2107                 *(p++)=SSL3_MT_SERVER_DONE;
2108                 *(p++)=0;
2109                 *(p++)=0;
2110                 *(p++)=0;
2111                 s->init_num += 4;
2112 #endif
2113
2114                 s->state = SSL3_ST_SW_CERT_REQ_B;
2115                 }
2116
2117         /* SSL3_ST_SW_CERT_REQ_B */
2118         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2119 err:
2120         return(-1);
2121         }
2122
2123 int ssl3_get_client_key_exchange(SSL *s)
2124         {
2125         int i,al,ok;
2126         long n;
2127         unsigned long alg_k;
2128         unsigned char *p;
2129 #ifndef OPENSSL_NO_RSA
2130         RSA *rsa=NULL;
2131         EVP_PKEY *pkey=NULL;
2132 #endif
2133 #ifndef OPENSSL_NO_DH
2134         BIGNUM *pub=NULL;
2135         DH *dh_srvr;
2136 #endif
2137 #ifndef OPENSSL_NO_KRB5
2138         KSSL_ERR kssl_err;
2139 #endif /* OPENSSL_NO_KRB5 */
2140
2141 #ifndef OPENSSL_NO_ECDH
2142         EC_KEY *srvr_ecdh = NULL;
2143         EVP_PKEY *clnt_pub_pkey = NULL;
2144         EC_POINT *clnt_ecpoint = NULL;
2145         BN_CTX *bn_ctx = NULL; 
2146 #endif
2147
2148         n=s->method->ssl_get_message(s,
2149                 SSL3_ST_SR_KEY_EXCH_A,
2150                 SSL3_ST_SR_KEY_EXCH_B,
2151                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2152                 2048, /* ??? */
2153                 &ok);
2154
2155         if (!ok) return((int)n);
2156         p=(unsigned char *)s->init_msg;
2157
2158         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2159
2160 #ifndef OPENSSL_NO_RSA
2161         if (alg_k & SSL_kRSA)
2162                 {
2163                 /* FIX THIS UP EAY EAY EAY EAY */
2164                 if (s->s3->tmp.use_rsa_tmp)
2165                         {
2166                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2167                                 rsa=s->cert->rsa_tmp;
2168                         /* Don't do a callback because rsa_tmp should
2169                          * be sent already */
2170                         if (rsa == NULL)
2171                                 {
2172                                 al=SSL_AD_HANDSHAKE_FAILURE;
2173                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2174                                 goto f_err;
2175
2176                                 }
2177                         }
2178                 else
2179                         {
2180                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2181                         if (    (pkey == NULL) ||
2182                                 (pkey->type != EVP_PKEY_RSA) ||
2183                                 (pkey->pkey.rsa == NULL))
2184                                 {
2185                                 al=SSL_AD_HANDSHAKE_FAILURE;
2186                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2187                                 goto f_err;
2188                                 }
2189                         rsa=pkey->pkey.rsa;
2190                         }
2191
2192                 /* TLS and [incidentally] DTLS{0xFEFF} */
2193                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2194                         {
2195                         n2s(p,i);
2196                         if (n != i+2)
2197                                 {
2198                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2199                                         {
2200                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2201                                         goto err;
2202                                         }
2203                                 else
2204                                         p-=2;
2205                                 }
2206                         else
2207                                 n=i;
2208                         }
2209
2210                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2211
2212                 al = -1;
2213                 
2214                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2215                         {
2216                         al=SSL_AD_DECODE_ERROR;
2217                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2218                         }
2219
2220                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2221                         {
2222                         /* The premaster secret must contain the same version number as the
2223                          * ClientHello to detect version rollback attacks (strangely, the
2224                          * protocol does not offer such protection for DH ciphersuites).
2225                          * However, buggy clients exist that send the negotiated protocol
2226                          * version instead if the server does not support the requested
2227                          * protocol version.
2228                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2229                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2230                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2231                                 {
2232                                 al=SSL_AD_DECODE_ERROR;
2233                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2234
2235                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2236                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2237                                  * number check as a "bad version oracle" -- an alert would
2238                                  * reveal that the plaintext corresponding to some ciphertext
2239                                  * made up by the adversary is properly formatted except
2240                                  * that the version number is wrong.  To avoid such attacks,
2241                                  * we should treat this just like any other decryption error. */
2242                                 }
2243                         }
2244
2245                 if (al != -1)
2246                         {
2247                         /* Some decryption failure -- use random value instead as countermeasure
2248                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2249                          * (see RFC 2246, section 7.4.7.1). */
2250                         ERR_clear_error();
2251                         i = SSL_MAX_MASTER_KEY_LENGTH;
2252                         p[0] = s->client_version >> 8;
2253                         p[1] = s->client_version & 0xff;
2254                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2255                                 goto err;
2256                         }
2257         
2258                 s->session->master_key_length=
2259                         s->method->ssl3_enc->generate_master_secret(s,
2260                                 s->session->master_key,
2261                                 p,i);
2262                 OPENSSL_cleanse(p,i);
2263                 }
2264         else
2265 #endif
2266 #ifndef OPENSSL_NO_DH
2267                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2268                 {
2269                 n2s(p,i);
2270                 if (n != i+2)
2271                         {
2272                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2273                                 {
2274                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2275                                 goto err;
2276                                 }
2277                         else
2278                                 {
2279                                 p-=2;
2280                                 i=(int)n;
2281                                 }
2282                         }
2283
2284                 if (n == 0L) /* the parameters are in the cert */
2285                         {
2286                         al=SSL_AD_HANDSHAKE_FAILURE;
2287                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2288                         goto f_err;
2289                         }
2290                 else
2291                         {
2292                         if (s->s3->tmp.dh == NULL)
2293                                 {
2294                                 al=SSL_AD_HANDSHAKE_FAILURE;
2295                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2296                                 goto f_err;
2297                                 }
2298                         else
2299                                 dh_srvr=s->s3->tmp.dh;
2300                         }
2301
2302                 pub=BN_bin2bn(p,i,NULL);
2303                 if (pub == NULL)
2304                         {
2305                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2306                         goto err;
2307                         }
2308
2309                 i=DH_compute_key(p,pub,dh_srvr);
2310
2311                 if (i <= 0)
2312                         {
2313                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2314                         goto err;
2315                         }
2316
2317                 DH_free(s->s3->tmp.dh);
2318                 s->s3->tmp.dh=NULL;
2319
2320                 BN_clear_free(pub);
2321                 pub=NULL;
2322                 s->session->master_key_length=
2323                         s->method->ssl3_enc->generate_master_secret(s,
2324                                 s->session->master_key,p,i);
2325                 OPENSSL_cleanse(p,i);
2326                 }
2327         else
2328 #endif
2329 #ifndef OPENSSL_NO_KRB5
2330         if (alg_k & SSL_kKRB5)
2331                 {
2332                 krb5_error_code         krb5rc;
2333                 krb5_data               enc_ticket;
2334                 krb5_data               authenticator;
2335                 krb5_data               enc_pms;
2336                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2337                 EVP_CIPHER_CTX          ciph_ctx;
2338                 const EVP_CIPHER        *enc = NULL;
2339                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2340                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2341                                                + EVP_MAX_BLOCK_LENGTH];
2342                 int                  padl, outl;
2343                 krb5_timestamp          authtime = 0;
2344                 krb5_ticket_times       ttimes;
2345
2346                 EVP_CIPHER_CTX_init(&ciph_ctx);
2347
2348                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2349
2350                 n2s(p,i);
2351                 enc_ticket.length = i;
2352
2353                 if (n < (long)(enc_ticket.length + 6))
2354                         {
2355                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2356                                 SSL_R_DATA_LENGTH_TOO_LONG);
2357                         goto err;
2358                         }
2359
2360                 enc_ticket.data = (char *)p;
2361                 p+=enc_ticket.length;
2362
2363                 n2s(p,i);
2364                 authenticator.length = i;
2365
2366                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2367                         {
2368                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2369                                 SSL_R_DATA_LENGTH_TOO_LONG);
2370                         goto err;
2371                         }
2372
2373                 authenticator.data = (char *)p;
2374                 p+=authenticator.length;
2375
2376                 n2s(p,i);
2377                 enc_pms.length = i;
2378                 enc_pms.data = (char *)p;
2379                 p+=enc_pms.length;
2380
2381                 /* Note that the length is checked again below,
2382                 ** after decryption
2383                 */
2384                 if(enc_pms.length > sizeof pms)
2385                         {
2386                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2387                                SSL_R_DATA_LENGTH_TOO_LONG);
2388                         goto err;
2389                         }
2390
2391                 if (n != (long)(enc_ticket.length + authenticator.length +
2392                                                 enc_pms.length + 6))
2393                         {
2394                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2395                                 SSL_R_DATA_LENGTH_TOO_LONG);
2396                         goto err;
2397                         }
2398
2399                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2400                                         &kssl_err)) != 0)
2401                         {
2402 #ifdef KSSL_DEBUG
2403                         printf("kssl_sget_tkt rtn %d [%d]\n",
2404                                 krb5rc, kssl_err.reason);
2405                         if (kssl_err.text)
2406                                 printf("kssl_err text= %s\n", kssl_err.text);
2407 #endif  /* KSSL_DEBUG */
2408                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2409                                 kssl_err.reason);
2410                         goto err;
2411                         }
2412
2413                 /*  Note: no authenticator is not considered an error,
2414                 **  but will return authtime == 0.
2415                 */
2416                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2417                                         &authtime, &kssl_err)) != 0)
2418                         {
2419 #ifdef KSSL_DEBUG
2420                         printf("kssl_check_authent rtn %d [%d]\n",
2421                                 krb5rc, kssl_err.reason);
2422                         if (kssl_err.text)
2423                                 printf("kssl_err text= %s\n", kssl_err.text);
2424 #endif  /* KSSL_DEBUG */
2425                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2426                                 kssl_err.reason);
2427                         goto err;
2428                         }
2429
2430                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2431                         {
2432                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2433                         goto err;
2434                         }
2435
2436 #ifdef KSSL_DEBUG
2437                 kssl_ctx_show(kssl_ctx);
2438 #endif  /* KSSL_DEBUG */
2439
2440                 enc = kssl_map_enc(kssl_ctx->enctype);
2441                 if (enc == NULL)
2442                     goto err;
2443
2444                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2445
2446                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2447                         {
2448                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2449                                 SSL_R_DECRYPTION_FAILED);
2450                         goto err;
2451                         }
2452                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2453                                         (unsigned char *)enc_pms.data, enc_pms.length))
2454                         {
2455                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2456                                 SSL_R_DECRYPTION_FAILED);
2457                         goto err;
2458                         }
2459                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2460                         {
2461                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2462                                 SSL_R_DATA_LENGTH_TOO_LONG);
2463                         goto err;
2464                         }
2465                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2466                         {
2467                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2468                                 SSL_R_DECRYPTION_FAILED);
2469                         goto err;
2470                         }
2471                 outl += padl;
2472                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2473                         {
2474                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2475                                 SSL_R_DATA_LENGTH_TOO_LONG);
2476                         goto err;
2477                         }
2478                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2479                     {
2480                     /* The premaster secret must contain the same version number as the
2481                      * ClientHello to detect version rollback attacks (strangely, the
2482                      * protocol does not offer such protection for DH ciphersuites).
2483                      * However, buggy clients exist that send random bytes instead of
2484                      * the protocol version.
2485                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2486                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2487                      */
2488                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2489                         {
2490                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2491                                SSL_AD_DECODE_ERROR);
2492                         goto err;
2493                         }
2494                     }
2495
2496                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2497
2498                 s->session->master_key_length=
2499                         s->method->ssl3_enc->generate_master_secret(s,
2500                                 s->session->master_key, pms, outl);
2501
2502                 if (kssl_ctx->client_princ)
2503                         {
2504                         size_t len = strlen(kssl_ctx->client_princ);
2505                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2506                                 {
2507                                 s->session->krb5_client_princ_len = len;
2508                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2509                                 }
2510                         }
2511
2512
2513                 /*  Was doing kssl_ctx_free() here,
2514                 **  but it caused problems for apache.
2515                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2516                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2517                 */
2518                 }
2519         else
2520 #endif  /* OPENSSL_NO_KRB5 */
2521
2522 #ifndef OPENSSL_NO_ECDH
2523                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2524                 {
2525                 int ret = 1;
2526                 int field_size = 0;
2527                 const EC_KEY   *tkey;
2528                 const EC_GROUP *group;
2529                 const BIGNUM *priv_key;
2530
2531                 /* initialize structures for server's ECDH key pair */
2532                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2533                         {
2534                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2535                             ERR_R_MALLOC_FAILURE);
2536                         goto err;
2537                         }
2538
2539                 /* Let's get server private key and group information */
2540                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2541                         { 
2542                         /* use the certificate */
2543                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2544                         }
2545                 else
2546                         {
2547                         /* use the ephermeral values we saved when
2548                          * generating the ServerKeyExchange msg.
2549                          */
2550                         tkey = s->s3->tmp.ecdh;
2551                         }
2552
2553                 group    = EC_KEY_get0_group(tkey);
2554                 priv_key = EC_KEY_get0_private_key(tkey);
2555
2556                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2557                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2558                         {
2559                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2560                                ERR_R_EC_LIB);
2561                         goto err;
2562                         }
2563
2564                 /* Let's get client's public key */
2565                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2566                         {
2567                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2568                             ERR_R_MALLOC_FAILURE);
2569                         goto err;
2570                         }
2571
2572                 if (n == 0L) 
2573                         {
2574                         /* Client Publickey was in Client Certificate */
2575
2576                          if (alg_k & SSL_kEECDH)
2577                                  {
2578                                  al=SSL_AD_HANDSHAKE_FAILURE;
2579                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2580                                  goto f_err;
2581                                  }
2582                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2583                             == NULL) || 
2584                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2585                                 {
2586                                 /* XXX: For now, we do not support client
2587                                  * authentication using ECDH certificates
2588                                  * so this branch (n == 0L) of the code is
2589                                  * never executed. When that support is
2590                                  * added, we ought to ensure the key 
2591                                  * received in the certificate is 
2592                                  * authorized for key agreement.
2593                                  * ECDH_compute_key implicitly checks that
2594                                  * the two ECDH shares are for the same
2595                                  * group.
2596                                  */
2597                                 al=SSL_AD_HANDSHAKE_FAILURE;
2598                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2599                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2600                                 goto f_err;
2601                                 }
2602
2603                         if (EC_POINT_copy(clnt_ecpoint,
2604                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2605                                 {
2606                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2607                                         ERR_R_EC_LIB);
2608                                 goto err;
2609                                 }
2610                         ret = 2; /* Skip certificate verify processing */
2611                         }
2612                 else
2613                         {
2614                         /* Get client's public key from encoded point
2615                          * in the ClientKeyExchange message.
2616                          */
2617                         if ((bn_ctx = BN_CTX_new()) == NULL)
2618                                 {
2619                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2620                                     ERR_R_MALLOC_FAILURE);
2621                                 goto err;
2622                                 }
2623
2624                         /* Get encoded point length */
2625                         i = *p; 
2626                         p += 1;
2627                         if (n != 1 + i)
2628                                 {
2629                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2630                                     ERR_R_EC_LIB);
2631                                 goto err;
2632                                 }
2633                         if (EC_POINT_oct2point(group, 
2634                             clnt_ecpoint, p, i, bn_ctx) == 0)
2635                                 {
2636                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2637                                     ERR_R_EC_LIB);
2638                                 goto err;
2639                                 }
2640                         /* p is pointing to somewhere in the buffer
2641                          * currently, so set it to the start 
2642                          */ 
2643                         p=(unsigned char *)s->init_buf->data;
2644                         }
2645
2646                 /* Compute the shared pre-master secret */
2647                 field_size = EC_GROUP_get_degree(group);
2648                 if (field_size <= 0)
2649                         {
2650                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2651                                ERR_R_ECDH_LIB);
2652                         goto err;
2653                         }
2654                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2655                 if (i <= 0)
2656                         {
2657                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2658                             ERR_R_ECDH_LIB);
2659                         goto err;
2660                         }
2661
2662                 EVP_PKEY_free(clnt_pub_pkey);
2663                 EC_POINT_free(clnt_ecpoint);
2664                 EC_KEY_free(srvr_ecdh);
2665                 BN_CTX_free(bn_ctx);
2666                 EC_KEY_free(s->s3->tmp.ecdh);
2667                 s->s3->tmp.ecdh = NULL; 
2668
2669                 /* Compute the master secret */
2670                 s->session->master_key_length = s->method->ssl3_enc-> \
2671                     generate_master_secret(s, s->session->master_key, p, i);
2672                 
2673                 OPENSSL_cleanse(p, i);
2674                 return (ret);
2675                 }
2676         else
2677 #endif
2678 #ifndef OPENSSL_NO_PSK
2679                 if (alg_k & SSL_kPSK)
2680                         {
2681                         unsigned char *t = NULL;
2682                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2683                         unsigned int pre_ms_len = 0, psk_len = 0;
2684                         int psk_err = 1;
2685                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2686
2687                         al=SSL_AD_HANDSHAKE_FAILURE;
2688
2689                         n2s(p,i);
2690                         if (n != i+2)
2691                                 {
2692                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2693                                         SSL_R_LENGTH_MISMATCH);
2694                                 goto psk_err;
2695                                 }
2696                         if (i > PSK_MAX_IDENTITY_LEN)
2697                                 {
2698                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2699                                         SSL_R_DATA_LENGTH_TOO_LONG);
2700                                 goto psk_err;
2701                                 }
2702                         if (s->psk_server_callback == NULL)
2703                                 {
2704                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2705                                        SSL_R_PSK_NO_SERVER_CB);
2706                                 goto psk_err;
2707                                 }
2708
2709                         /* Create guaranteed NULL-terminated identity
2710                          * string for the callback */
2711                         memcpy(tmp_id, p, i);
2712                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2713                         psk_len = s->psk_server_callback(s, tmp_id,
2714                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2715                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2716
2717                         if (psk_len > PSK_MAX_PSK_LEN)
2718                                 {
2719                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2720                                         ERR_R_INTERNAL_ERROR);
2721                                 goto psk_err;
2722                                 }
2723                         else if (psk_len == 0)
2724                                 {
2725                                 /* PSK related to the given identity not found */
2726                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2727                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2728                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2729                                 goto psk_err;
2730                                 }
2731
2732                         /* create PSK pre_master_secret */
2733                         pre_ms_len=2+psk_len+2+psk_len;
2734                         t = psk_or_pre_ms;
2735                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2736                         s2n(psk_len, t);
2737                         memset(t, 0, psk_len);
2738                         t+=psk_len;
2739                         s2n(psk_len, t);
2740
2741                         if (s->session->psk_identity != NULL)
2742                                 OPENSSL_free(s->session->psk_identity);
2743                         s->session->psk_identity = BUF_strdup((char *)p);
2744                         if (s->session->psk_identity == NULL)
2745                                 {
2746                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2747                                         ERR_R_MALLOC_FAILURE);
2748                                 goto psk_err;
2749                                 }
2750
2751                         if (s->session->psk_identity_hint != NULL)
2752                                 OPENSSL_free(s->session->psk_identity_hint);
2753                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2754                         if (s->ctx->psk_identity_hint != NULL &&
2755                                 s->session->psk_identity_hint == NULL)
2756                                 {
2757                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2758                                         ERR_R_MALLOC_FAILURE);
2759                                 goto psk_err;
2760                                 }
2761
2762                         s->session->master_key_length=
2763                                 s->method->ssl3_enc->generate_master_secret(s,
2764                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2765                         psk_err = 0;
2766                 psk_err:
2767                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2768                         if (psk_err != 0)
2769                                 goto f_err;
2770                         }
2771                 else
2772 #endif
2773 #ifndef OPENSSL_NO_SRP
2774                 if (alg_k & SSL_kSRP)
2775                         {
2776                         int param_len;
2777
2778                         n2s(p,i);
2779                         param_len=i+2;
2780                         if (param_len > n)
2781                                 {
2782                                 al=SSL_AD_DECODE_ERROR;
2783                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2784                                 goto f_err;
2785                                 }
2786                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2787                                 {
2788                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2789                                 goto err;
2790                                 }
2791                         if (s->session->srp_username != NULL)
2792                                 OPENSSL_free(s->session->srp_username);
2793                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2794                         if (s->session->srp_username == NULL)
2795                                 {
2796                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2797                                         ERR_R_MALLOC_FAILURE);
2798                                 goto err;
2799                                 }
2800
2801                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2802                                 {
2803                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2804                                 goto err;
2805                                 }
2806
2807                         p+=i;
2808                         }
2809                 else
2810 #endif  /* OPENSSL_NO_SRP */
2811                 if (alg_k & SSL_kGOST) 
2812                         {
2813                         int ret = 0;
2814                         EVP_PKEY_CTX *pkey_ctx;
2815                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2816                         unsigned char premaster_secret[32], *start;
2817                         size_t outlen=32, inlen;
2818                         unsigned long alg_a;
2819
2820                         /* Get our certificate private key*/
2821                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2822                         if (alg_a & SSL_aGOST94)
2823                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2824                         else if (alg_a & SSL_aGOST01)
2825                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2826
2827                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2828                         EVP_PKEY_decrypt_init(pkey_ctx);
2829                         /* If client certificate is present and is of the same type, maybe
2830                          * use it for key exchange.  Don't mind errors from
2831                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2832                          * a client certificate for authorization only. */
2833                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2834                         if (client_pub_pkey)
2835                                 {
2836                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2837                                         ERR_clear_error();
2838                                 }
2839                         /* Decrypt session key */
2840                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2841                                 {
2842                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2843                                 goto gerr;
2844                                 }
2845                         if (p[1] == 0x81)
2846                                 {
2847                                 start = p+3;
2848                                 inlen = p[2];
2849                                 }
2850                         else if (p[1] < 0x80)
2851                                 {
2852                                 start = p+2;
2853                                 inlen = p[1];
2854                                 }
2855                         else
2856                                 {
2857                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2858                                 goto gerr;
2859                                 }
2860                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2861
2862                                 {
2863                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2864                                 goto gerr;
2865                                 }
2866                         /* Generate master secret */
2867                         s->session->master_key_length=
2868                                 s->method->ssl3_enc->generate_master_secret(s,
2869                                         s->session->master_key,premaster_secret,32);
2870                         /* Check if pubkey from client certificate was used */
2871                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2872                                 ret = 2;
2873                         else
2874                                 ret = 1;
2875                 gerr:
2876                         EVP_PKEY_free(client_pub_pkey);
2877                         EVP_PKEY_CTX_free(pkey_ctx);
2878                         if (ret)
2879                                 return ret;
2880                         else
2881                                 goto err;
2882                         }
2883                 else
2884                 {
2885                 al=SSL_AD_HANDSHAKE_FAILURE;
2886                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2887                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2888                 goto f_err;
2889                 }
2890
2891         return(1);
2892 f_err:
2893         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2894 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2895 err:
2896 #endif
2897 #ifndef OPENSSL_NO_ECDH
2898         EVP_PKEY_free(clnt_pub_pkey);
2899         EC_POINT_free(clnt_ecpoint);
2900         if (srvr_ecdh != NULL) 
2901                 EC_KEY_free(srvr_ecdh);
2902         BN_CTX_free(bn_ctx);
2903 #endif
2904         return(-1);
2905         }
2906
2907 int ssl3_get_cert_verify(SSL *s)
2908         {
2909         EVP_PKEY *pkey=NULL;
2910         unsigned char *p;
2911         int al,ok,ret=0;
2912         long n;
2913         int type=0,i,j;
2914         X509 *peer;
2915         const EVP_MD *md = NULL;
2916         EVP_MD_CTX mctx;
2917         EVP_MD_CTX_init(&mctx);
2918
2919         n=s->method->ssl_get_message(s,
2920                 SSL3_ST_SR_CERT_VRFY_A,
2921                 SSL3_ST_SR_CERT_VRFY_B,
2922                 -1,
2923                 514, /* 514? */
2924                 &ok);
2925
2926         if (!ok) return((int)n);
2927
2928         if (s->session->peer != NULL)
2929                 {
2930                 peer=s->session->peer;
2931                 pkey=X509_get_pubkey(peer);
2932                 type=X509_certificate_type(peer,pkey);
2933                 }
2934         else
2935                 {
2936                 peer=NULL;
2937                 pkey=NULL;
2938                 }
2939
2940         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2941                 {
2942                 s->s3->tmp.reuse_message=1;
2943                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2944                         {
2945                         al=SSL_AD_UNEXPECTED_MESSAGE;
2946                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2947                         goto f_err;
2948                         }
2949                 ret=1;
2950                 goto end;
2951                 }
2952
2953         if (peer == NULL)
2954                 {
2955                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2956                 al=SSL_AD_UNEXPECTED_MESSAGE;
2957                 goto f_err;
2958                 }
2959
2960         if (!(type & EVP_PKT_SIGN))
2961                 {
2962                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2963                 al=SSL_AD_ILLEGAL_PARAMETER;
2964                 goto f_err;
2965                 }
2966
2967         if (s->s3->change_cipher_spec)
2968                 {
2969                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2970                 al=SSL_AD_UNEXPECTED_MESSAGE;
2971                 goto f_err;
2972                 }
2973
2974         /* we now have a signature that we need to verify */
2975         p=(unsigned char *)s->init_msg;
2976         /* Check for broken implementations of GOST ciphersuites */
2977         /* If key is GOST and n is exactly 64, it is bare
2978          * signature without length field */
2979         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2980                 pkey->type == NID_id_GostR3410_2001) )
2981                 {
2982                 i=64;
2983                 } 
2984         else 
2985                 {       
2986                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2987                         {
2988                         int sigalg = tls12_get_sigid(pkey);
2989                         /* Should never happen */
2990                         if (sigalg == -1)
2991                                 {
2992                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2993                                 al=SSL_AD_INTERNAL_ERROR;
2994                                 goto f_err;
2995                                 }
2996                         /* Check key type is consistent with signature */
2997                         if (sigalg != (int)p[1])
2998                                 {
2999                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3000                                 al=SSL_AD_DECODE_ERROR;
3001                                 goto f_err;
3002                                 }
3003                         md = tls12_get_hash(p[0]);
3004                         if (md == NULL)
3005                                 {
3006                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3007                                 al=SSL_AD_DECODE_ERROR;
3008                                 goto f_err;
3009                                 }
3010 #ifdef SSL_DEBUG
3011 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3012 #endif
3013                         p += 2;
3014                         n -= 2;
3015                         }
3016                 n2s(p,i);
3017                 n-=2;
3018                 if (i > n)
3019                         {
3020                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3021                         al=SSL_AD_DECODE_ERROR;
3022                         goto f_err;
3023                         }
3024         }
3025         j=EVP_PKEY_size(pkey);
3026         if ((i > j) || (n > j) || (n <= 0))
3027                 {
3028                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3029                 al=SSL_AD_DECODE_ERROR;
3030                 goto f_err;
3031                 }
3032
3033         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3034                 {
3035                 long hdatalen = 0;
3036                 void *hdata;
3037                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3038                 if (hdatalen <= 0)
3039                         {
3040                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3041                         al=SSL_AD_INTERNAL_ERROR;
3042                         goto f_err;
3043                         }
3044 #ifdef SSL_DEBUG
3045                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3046                                                         EVP_MD_name(md));
3047 #endif
3048                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3049                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3050                         {
3051                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3052                         al=SSL_AD_INTERNAL_ERROR;
3053                         goto f_err;
3054                         }
3055
3056                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3057                         {
3058                         al=SSL_AD_DECRYPT_ERROR;
3059                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3060                         goto f_err;
3061                         }
3062                 }
3063         else
3064 #ifndef OPENSSL_NO_RSA 
3065         if (pkey->type == EVP_PKEY_RSA)
3066                 {
3067                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3068                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
3069                                                         pkey->pkey.rsa);
3070                 if (i < 0)
3071                         {
3072                         al=SSL_AD_DECRYPT_ERROR;
3073                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3074                         goto f_err;
3075                         }
3076                 if (i == 0)
3077                         {
3078                         al=SSL_AD_DECRYPT_ERROR;
3079                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3080                         goto f_err;
3081                         }
3082                 }
3083         else
3084 #endif
3085 #ifndef OPENSSL_NO_DSA
3086                 if (pkey->type == EVP_PKEY_DSA)
3087                 {
3088                 j=DSA_verify(pkey->save_type,
3089                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3090                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3091                 if (j <= 0)
3092                         {
3093                         /* bad signature */
3094                         al=SSL_AD_DECRYPT_ERROR;
3095                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3096                         goto f_err;
3097                         }
3098                 }
3099         else
3100 #endif
3101 #ifndef OPENSSL_NO_ECDSA
3102                 if (pkey->type == EVP_PKEY_EC)
3103                 {
3104                 j=ECDSA_verify(pkey->save_type,
3105                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3106                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3107                 if (j <= 0)
3108                         {
3109                         /* bad signature */
3110                         al=SSL_AD_DECRYPT_ERROR;
3111                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3112                             SSL_R_BAD_ECDSA_SIGNATURE);
3113                         goto f_err;
3114                         }
3115                 }
3116         else
3117 #endif
3118         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3119                 {   unsigned char signature[64];
3120                         int idx;
3121                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3122                         EVP_PKEY_verify_init(pctx);
3123                         if (i!=64) {
3124                                 fprintf(stderr,"GOST signature length is %d",i);
3125                         }       
3126                         for (idx=0;idx<64;idx++) {
3127                                 signature[63-idx]=p[idx];
3128                         }       
3129                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3130                         EVP_PKEY_CTX_free(pctx);
3131                         if (j<=0) 
3132                                 {
3133                                 al=SSL_AD_DECRYPT_ERROR;
3134                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3135                                         SSL_R_BAD_ECDSA_SIGNATURE);
3136                                 goto f_err;
3137                                 }       
3138                 }
3139         else    
3140                 {
3141                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3142                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3143                 goto f_err;
3144                 }
3145
3146
3147         ret=1;
3148         if (0)
3149                 {
3150 f_err:
3151                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3152                 }
3153 end:
3154         if (s->s3->handshake_buffer)
3155                 {
3156                 BIO_free(s->s3->handshake_buffer);
3157                 s->s3->handshake_buffer = NULL;
3158                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3159                 }
3160         EVP_MD_CTX_cleanup(&mctx);
3161         EVP_PKEY_free(pkey);
3162         return(ret);
3163         }
3164
3165 int ssl3_get_client_certificate(SSL *s)
3166         {
3167         int i,ok,al,ret= -1;
3168         X509 *x=NULL;
3169         unsigned long l,nc,llen,n;
3170         const unsigned char *p,*q;
3171         unsigned char *d;
3172         STACK_OF(X509) *sk=NULL;
3173
3174         n=s->method->ssl_get_message(s,
3175                 SSL3_ST_SR_CERT_A,
3176                 SSL3_ST_SR_CERT_B,
3177                 -1,
3178                 s->max_cert_list,
3179                 &ok);
3180
3181         if (!ok) return((int)n);
3182
3183         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3184                 {
3185                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3186                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3187                         {
3188                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3189                         al=SSL_AD_HANDSHAKE_FAILURE;
3190                         goto f_err;
3191                         }
3192                 /* If tls asked for a client cert, the client must return a 0 list */
3193                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3194                         {
3195                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3196                         al=SSL_AD_UNEXPECTED_MESSAGE;
3197                         goto f_err;
3198                         }
3199                 s->s3->tmp.reuse_message=1;
3200                 return(1);
3201                 }
3202
3203         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3204                 {
3205                 al=SSL_AD_UNEXPECTED_MESSAGE;
3206                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3207                 goto f_err;
3208                 }
3209         p=d=(unsigned char *)s->init_msg;
3210
3211         if ((sk=sk_X509_new_null()) == NULL)
3212                 {
3213                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3214                 goto err;
3215                 }
3216
3217         n2l3(p,llen);
3218         if (llen+3 != n)
3219                 {
3220                 al=SSL_AD_DECODE_ERROR;
3221                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3222                 goto f_err;
3223                 }
3224         for (nc=0; nc<llen; )
3225                 {
3226                 n2l3(p,l);
3227                 if ((l+nc+3) > llen)
3228                         {
3229                         al=SSL_AD_DECODE_ERROR;
3230                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3231                         goto f_err;
3232                         }
3233
3234                 q=p;
3235                 x=d2i_X509(NULL,&p,l);
3236                 if (x == NULL)
3237                         {
3238                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3239                         goto err;
3240                         }
3241                 if (p != (q+l))
3242                         {
3243                         al=SSL_AD_DECODE_ERROR;
3244                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3245                         goto f_err;
3246                         }
3247                 if (!sk_X509_push(sk,x))
3248                         {
3249                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3250                         goto err;
3251                         }
3252                 x=NULL;
3253                 nc+=l+3;
3254                 }
3255
3256         if (sk_X509_num(sk) <= 0)
3257                 {
3258                 /* TLS does not mind 0 certs returned */
3259                 if (s->version == SSL3_VERSION)
3260                         {
3261                         al=SSL_AD_HANDSHAKE_FAILURE;
3262                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3263                         goto f_err;
3264                         }
3265                 /* Fail for TLS only if we required a certificate */
3266                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3267                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3268                         {
3269                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3270                         al=SSL_AD_HANDSHAKE_FAILURE;
3271                         goto f_err;
3272                         }
3273                 /* No client certificate so digest cached records */
3274                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3275                         {
3276                         al=SSL_AD_INTERNAL_ERROR;
3277                         goto f_err;
3278                         }
3279                 }
3280         else
3281                 {
3282                 i=ssl_verify_cert_chain(s,sk);
3283                 if (i <= 0)
3284                         {
3285                         al=ssl_verify_alarm_type(s->verify_result);
3286                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3287                         goto f_err;
3288                         }
3289                 }
3290
3291         if (s->session->peer != NULL) /* This should not be needed */
3292                 X509_free(s->session->peer);
3293         s->session->peer=sk_X509_shift(sk);
3294         s->session->verify_result = s->verify_result;
3295
3296         /* With the current implementation, sess_cert will always be NULL
3297          * when we arrive here. */
3298         if (s->session->sess_cert == NULL)
3299                 {
3300                 s->session->sess_cert = ssl_sess_cert_new();
3301                 if (s->session->sess_cert == NULL)
3302                         {
3303                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3304                         goto err;
3305                         }
3306                 }
3307         if (s->session->sess_cert->cert_chain != NULL)
3308                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3309         s->session->sess_cert->cert_chain=sk;
3310         /* Inconsistency alert: cert_chain does *not* include the
3311          * peer's own certificate, while we do include it in s3_clnt.c */
3312
3313         sk=NULL;
3314
3315         ret=1;
3316         if (0)
3317                 {
3318 f_err:
3319                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3320                 }
3321 err:
3322         if (x != NULL) X509_free(x);
3323         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3324         return(ret);
3325         }
3326
3327 int ssl3_send_server_certificate(SSL *s)
3328         {
3329         unsigned long l;
3330         X509 *x;
3331
3332         if (s->state == SSL3_ST_SW_CERT_A)
3333                 {
3334                 x=ssl_get_server_send_cert(s);
3335                 if (x == NULL)
3336                         {
3337                         /* VRS: allow null cert if auth == KRB5 */
3338                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3339                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3340                                 {
3341                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3342                                 return(0);
3343                                 }
3344                         }
3345
3346                 l=ssl3_output_cert_chain(s,x);
3347                 s->state=SSL3_ST_SW_CERT_B;
3348                 s->init_num=(int)l;
3349                 s->init_off=0;
3350                 }
3351
3352         /* SSL3_ST_SW_CERT_B */
3353         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3354         }
3355
3356 #ifndef OPENSSL_NO_TLSEXT
3357 /* send a new session ticket (not necessarily for a new session) */
3358 int ssl3_send_newsession_ticket(SSL *s)
3359         {
3360         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3361                 {
3362                 unsigned char *p, *senc, *macstart;
3363                 const unsigned char *const_p;
3364                 int len, slen_full, slen;
3365                 SSL_SESSION *sess;
3366                 unsigned int hlen;
3367                 EVP_CIPHER_CTX ctx;
3368                 HMAC_CTX hctx;
3369                 SSL_CTX *tctx = s->initial_ctx;
3370                 unsigned char iv[EVP_MAX_IV_LENGTH];
3371                 unsigned char key_name[16];
3372
3373                 /* get session encoding length */
3374                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3375                 /* Some length values are 16 bits, so forget it if session is
3376                  * too long
3377                  */