PR: 2658
[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
301                         if (s->state != SSL_ST_RENEGOTIATE)
302                                 {
303                                 /* Ok, we now need to push on a buffering BIO so that
304                                  * the output is sent in a way that TCP likes :-)
305                                  */
306                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
307                                 
308                                 ssl3_init_finished_mac(s);
309                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
310                                 s->ctx->stats.sess_accept++;
311                                 }
312                         else if (!s->s3->send_connection_binding &&
313                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
314                                 {
315                                 /* Server attempting to renegotiate with
316                                  * client that doesn't support secure
317                                  * renegotiation.
318                                  */
319                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
320                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
321                                 ret = -1;
322                                 goto end;
323                                 }
324                         else
325                                 {
326                                 /* s->state == SSL_ST_RENEGOTIATE,
327                                  * we will just send a HelloRequest */
328                                 s->ctx->stats.sess_accept_renegotiate++;
329                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
330                                 }
331                         break;
332
333                 case SSL3_ST_SW_HELLO_REQ_A:
334                 case SSL3_ST_SW_HELLO_REQ_B:
335
336                         s->shutdown=0;
337                         ret=ssl3_send_hello_request(s);
338                         if (ret <= 0) goto end;
339                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
340                         s->state=SSL3_ST_SW_FLUSH;
341                         s->init_num=0;
342
343                         ssl3_init_finished_mac(s);
344                         break;
345
346                 case SSL3_ST_SW_HELLO_REQ_C:
347                         s->state=SSL_ST_OK;
348                         break;
349
350                 case SSL3_ST_SR_CLNT_HELLO_A:
351                 case SSL3_ST_SR_CLNT_HELLO_B:
352                 case SSL3_ST_SR_CLNT_HELLO_C:
353
354                         if (s->rwstate != SSL_X509_LOOKUP)
355                         {
356                                 ret=ssl3_get_client_hello(s);
357                                 if (ret <= 0) goto end;
358                         }
359 #ifndef OPENSSL_NO_SRP
360                         {
361                         int al;
362                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
363                                         {
364                                         /* callback indicates firther work to be done */
365                                         s->rwstate=SSL_X509_LOOKUP;
366                                         goto end;
367                                         }
368                         if (ret != SSL_ERROR_NONE)
369                                 {
370                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);    
371                                 /* This is not really an error but the only means to
372                                    for a client to detect whether srp is supported. */
373                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)      
374                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);                     
375                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;                       
376                                 ret= -1;
377                                 goto end;       
378                                 }
379                         }
380 #endif          
381                         
382                         s->renegotiate = 2;
383                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
384                         s->init_num=0;
385                         break;
386
387                 case SSL3_ST_SW_SRVR_HELLO_A:
388                 case SSL3_ST_SW_SRVR_HELLO_B:
389                         ret=ssl3_send_server_hello(s);
390                         if (ret <= 0) goto end;
391 #ifndef OPENSSL_NO_TLSEXT
392                         if (s->hit)
393                                 {
394                                 if (s->tlsext_ticket_expected)
395                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
396                                 else
397                                         s->state=SSL3_ST_SW_CHANGE_A;
398                                 }
399 #else
400                         if (s->hit)
401                                         s->state=SSL3_ST_SW_CHANGE_A;
402 #endif
403                         else
404                                 s->state=SSL3_ST_SW_CERT_A;
405                         s->init_num=0;
406                         break;
407
408                 case SSL3_ST_SW_CERT_A:
409                 case SSL3_ST_SW_CERT_B:
410                         /* Check if it is anon DH or anon ECDH, */
411                         /* normal PSK or KRB5 or SRP */
412                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
413                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
414                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
415                                 {
416                                 ret=ssl3_send_server_certificate(s);
417                                 if (ret <= 0) goto end;
418 #ifndef OPENSSL_NO_TLSEXT
419                                 if (s->tlsext_status_expected)
420                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
421                                 else
422                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
423                                 }
424                         else
425                                 {
426                                 skip = 1;
427                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
428                                 }
429 #else
430                                 }
431                         else
432                                 skip=1;
433
434                         s->state=SSL3_ST_SW_KEY_EXCH_A;
435 #endif
436                         s->init_num=0;
437                         break;
438
439                 case SSL3_ST_SW_KEY_EXCH_A:
440                 case SSL3_ST_SW_KEY_EXCH_B:
441                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
442
443                         /* clear this, it may get reset by
444                          * send_server_key_exchange */
445                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
446 #ifndef OPENSSL_NO_KRB5
447                                 && !(alg_k & SSL_kKRB5)
448 #endif /* OPENSSL_NO_KRB5 */
449                                 )
450                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
451                                  * even when forbidden by protocol specs
452                                  * (handshake may fail as clients are not required to
453                                  * be able to handle this) */
454                                 s->s3->tmp.use_rsa_tmp=1;
455                         else
456                                 s->s3->tmp.use_rsa_tmp=0;
457
458
459                         /* only send if a DH key exchange, fortezza or
460                          * RSA but we have a sign only certificate
461                          *
462                          * PSK: may send PSK identity hints
463                          *
464                          * For ECC ciphersuites, we send a serverKeyExchange
465                          * message only if the cipher suite is either
466                          * ECDH-anon or ECDHE. In other cases, the
467                          * server certificate contains the server's
468                          * public key for key exchange.
469                          */
470                         if (s->s3->tmp.use_rsa_tmp
471                         /* PSK: send ServerKeyExchange if PSK identity
472                          * hint if provided */
473 #ifndef OPENSSL_NO_PSK
474                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
475 #endif
476 #ifndef OPENSSL_NO_SRP
477                             /* SRP: send ServerKeyExchange */
478                             || (alg_k & SSL_kSRP)
479 #endif
480                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
481                             || (alg_k & SSL_kEECDH)
482                             || ((alg_k & SSL_kRSA)
483                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
484                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
485                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
486                                         )
487                                     )
488                                 )
489                             )
490                                 {
491                                 ret=ssl3_send_server_key_exchange(s);
492                                 if (ret <= 0) goto end;
493                                 }
494                         else
495                                 skip=1;
496
497                         s->state=SSL3_ST_SW_CERT_REQ_A;
498                         s->init_num=0;
499                         break;
500
501                 case SSL3_ST_SW_CERT_REQ_A:
502                 case SSL3_ST_SW_CERT_REQ_B:
503                         if (/* don't request cert unless asked for it: */
504                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
505                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
506                                  * don't request cert during re-negotiation: */
507                                 ((s->session->peer != NULL) &&
508                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
509                                 /* never request cert in anonymous ciphersuites
510                                  * (see section "Certificate request" in SSL 3 drafts
511                                  * and in RFC 2246): */
512                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
513                                  /* ... except when the application insists on verification
514                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
515                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
516                                  /* never request cert in Kerberos ciphersuites */
517                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
518                                 /* With normal PSK Certificates and
519                                  * Certificate Requests are omitted */
520                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
521                                 {
522                                 /* no cert request */
523                                 skip=1;
524                                 s->s3->tmp.cert_request=0;
525                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
526                                 if (s->s3->handshake_buffer)
527                                         if (!ssl3_digest_cached_records(s))
528                                                 return -1;
529                                 }
530                         else
531                                 {
532                                 s->s3->tmp.cert_request=1;
533                                 ret=ssl3_send_certificate_request(s);
534                                 if (ret <= 0) goto end;
535 #ifndef NETSCAPE_HANG_BUG
536                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
537 #else
538                                 s->state=SSL3_ST_SW_FLUSH;
539                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
540 #endif
541                                 s->init_num=0;
542                                 }
543                         break;
544
545                 case SSL3_ST_SW_SRVR_DONE_A:
546                 case SSL3_ST_SW_SRVR_DONE_B:
547                         ret=ssl3_send_server_done(s);
548                         if (ret <= 0) goto end;
549                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
550                         s->state=SSL3_ST_SW_FLUSH;
551                         s->init_num=0;
552                         break;
553                 
554                 case SSL3_ST_SW_FLUSH:
555
556                         /* This code originally checked to see if
557                          * any data was pending using BIO_CTRL_INFO
558                          * and then flushed. This caused problems
559                          * as documented in PR#1939. The proposed
560                          * fix doesn't completely resolve this issue
561                          * as buggy implementations of BIO_CTRL_PENDING
562                          * still exist. So instead we just flush
563                          * unconditionally.
564                          */
565
566                         s->rwstate=SSL_WRITING;
567                         if (BIO_flush(s->wbio) <= 0)
568                                 {
569                                 ret= -1;
570                                 goto end;
571                                 }
572                         s->rwstate=SSL_NOTHING;
573
574                         s->state=s->s3->tmp.next_state;
575                         break;
576
577                 case SSL3_ST_SR_CERT_A:
578                 case SSL3_ST_SR_CERT_B:
579                         /* Check for second client hello (MS SGC) */
580                         ret = ssl3_check_client_hello(s);
581                         if (ret <= 0)
582                                 goto end;
583                         if (ret == 2)
584                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
585                         else {
586                                 if (s->s3->tmp.cert_request)
587                                         {
588                                         ret=ssl3_get_client_certificate(s);
589                                         if (ret <= 0) goto end;
590                                         }
591                                 s->init_num=0;
592                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
593                         }
594                         break;
595
596                 case SSL3_ST_SR_KEY_EXCH_A:
597                 case SSL3_ST_SR_KEY_EXCH_B:
598                         ret=ssl3_get_client_key_exchange(s);
599                         if (ret <= 0)
600                                 goto end;
601                         if (ret == 2)
602                                 {
603                                 /* For the ECDH ciphersuites when
604                                  * the client sends its ECDH pub key in
605                                  * a certificate, the CertificateVerify
606                                  * message is not sent.
607                                  * Also for GOST ciphersuites when
608                                  * the client uses its key from the certificate
609                                  * for key exchange.
610                                  */
611 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
612                                 s->state=SSL3_ST_SR_FINISHED_A;
613 #else
614                                 if (s->s3->next_proto_neg_seen)
615                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
616                                 else
617                                         s->state=SSL3_ST_SR_FINISHED_A;
618 #endif
619                                 s->init_num = 0;
620                                 }
621                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
622                                 {
623                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
624                                 s->init_num=0;
625                                 if (!s->session->peer)
626                                         break;
627                                 /* For TLS v1.2 freeze the handshake buffer
628                                  * at this point and digest cached records.
629                                  */
630                                 if (!s->s3->handshake_buffer)
631                                         {
632                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
633                                         return -1;
634                                         }
635                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
636                                 if (!ssl3_digest_cached_records(s))
637                                         return -1;
638                                 }
639                         else
640                                 {
641                                 int offset=0;
642                                 int dgst_num;
643
644                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
645                                 s->init_num=0;
646
647                                 /* We need to get hashes here so if there is
648                                  * a client cert, it can be verified
649                                  * FIXME - digest processing for CertificateVerify
650                                  * should be generalized. But it is next step
651                                  */
652                                 if (s->s3->handshake_buffer)
653                                         if (!ssl3_digest_cached_records(s))
654                                                 return -1;
655                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
656                                         if (s->s3->handshake_dgst[dgst_num]) 
657                                                 {
658                                                 int dgst_size;
659
660                                                 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]));
661                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
662                                                 if (dgst_size < 0)
663                                                         {
664                                                         ret = -1;
665                                                         goto end;
666                                                         }
667                                                 offset+=dgst_size;
668                                                 }               
669                                 }
670                         break;
671
672                 case SSL3_ST_SR_CERT_VRFY_A:
673                 case SSL3_ST_SR_CERT_VRFY_B:
674
675                         /* we should decide if we expected this one */
676                         ret=ssl3_get_cert_verify(s);
677                         if (ret <= 0) goto end;
678
679 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
680                         s->state=SSL3_ST_SR_FINISHED_A;
681 #else
682                         if (s->s3->next_proto_neg_seen)
683                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
684                         else
685                                 s->state=SSL3_ST_SR_FINISHED_A;
686 #endif
687                         s->init_num=0;
688                         break;
689
690 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
691                 case SSL3_ST_SR_NEXT_PROTO_A:
692                 case SSL3_ST_SR_NEXT_PROTO_B:
693                         ret=ssl3_get_next_proto(s);
694                         if (ret <= 0) goto end;
695                         s->init_num = 0;
696                         s->state=SSL3_ST_SR_FINISHED_A;
697                         break;
698 #endif
699
700                 case SSL3_ST_SR_FINISHED_A:
701                 case SSL3_ST_SR_FINISHED_B:
702                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
703                                 SSL3_ST_SR_FINISHED_B);
704                         if (ret <= 0) goto end;
705                         if (s->hit)
706                                 s->state=SSL_ST_OK;
707 #ifndef OPENSSL_NO_TLSEXT
708                         else if (s->tlsext_ticket_expected)
709                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
710 #endif
711                         else
712                                 s->state=SSL3_ST_SW_CHANGE_A;
713                         s->init_num=0;
714                         break;
715
716 #ifndef OPENSSL_NO_TLSEXT
717                 case SSL3_ST_SW_SESSION_TICKET_A:
718                 case SSL3_ST_SW_SESSION_TICKET_B:
719                         ret=ssl3_send_newsession_ticket(s);
720                         if (ret <= 0) goto end;
721                         s->state=SSL3_ST_SW_CHANGE_A;
722                         s->init_num=0;
723                         break;
724
725                 case SSL3_ST_SW_CERT_STATUS_A:
726                 case SSL3_ST_SW_CERT_STATUS_B:
727                         ret=ssl3_send_cert_status(s);
728                         if (ret <= 0) goto end;
729                         s->state=SSL3_ST_SW_KEY_EXCH_A;
730                         s->init_num=0;
731                         break;
732
733 #endif
734
735                 case SSL3_ST_SW_CHANGE_A:
736                 case SSL3_ST_SW_CHANGE_B:
737
738                         s->session->cipher=s->s3->tmp.new_cipher;
739                         if (!s->method->ssl3_enc->setup_key_block(s))
740                                 { ret= -1; goto end; }
741
742                         ret=ssl3_send_change_cipher_spec(s,
743                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
744
745                         if (ret <= 0) goto end;
746                         s->state=SSL3_ST_SW_FINISHED_A;
747                         s->init_num=0;
748
749                         if (!s->method->ssl3_enc->change_cipher_state(s,
750                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
751                                 {
752                                 ret= -1;
753                                 goto end;
754                                 }
755
756                         break;
757
758                 case SSL3_ST_SW_FINISHED_A:
759                 case SSL3_ST_SW_FINISHED_B:
760                         ret=ssl3_send_finished(s,
761                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
762                                 s->method->ssl3_enc->server_finished_label,
763                                 s->method->ssl3_enc->server_finished_label_len);
764                         if (ret <= 0) goto end;
765                         s->state=SSL3_ST_SW_FLUSH;
766                         if (s->hit)
767                                 {
768 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
769                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
770 #else
771                                 if (s->s3->next_proto_neg_seen)
772                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
773                                 else
774                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
775 #endif
776                                 }
777                         else
778                                 s->s3->tmp.next_state=SSL_ST_OK;
779                         s->init_num=0;
780                         break;
781
782                 case SSL_ST_OK:
783                         /* clean a few things up */
784                         ssl3_cleanup_key_block(s);
785
786                         BUF_MEM_free(s->init_buf);
787                         s->init_buf=NULL;
788
789                         /* remove buffering on output */
790                         ssl_free_wbio_buffer(s);
791
792                         s->init_num=0;
793
794                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
795                                 {
796                                 s->renegotiate=0;
797                                 s->new_session=0;
798                                 
799                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
800                                 
801                                 s->ctx->stats.sess_accept_good++;
802                                 /* s->server=1; */
803                                 s->handshake_func=ssl3_accept;
804
805                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
806                                 }
807                         
808                         ret = 1;
809                         goto end;
810                         /* break; */
811
812                 default:
813                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
814                         ret= -1;
815                         goto end;
816                         /* break; */
817                         }
818                 
819                 if (!s->s3->tmp.reuse_message && !skip)
820                         {
821                         if (s->debug)
822                                 {
823                                 if ((ret=BIO_flush(s->wbio)) <= 0)
824                                         goto end;
825                                 }
826
827
828                         if ((cb != NULL) && (s->state != state))
829                                 {
830                                 new_state=s->state;
831                                 s->state=state;
832                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
833                                 s->state=new_state;
834                                 }
835                         }
836                 skip=0;
837                 }
838 end:
839         /* BIO_flush(s->wbio); */
840
841         s->in_handshake--;
842         if (cb != NULL)
843                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
844         return(ret);
845         }
846
847 int ssl3_send_hello_request(SSL *s)
848         {
849         unsigned char *p;
850
851         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
852                 {
853                 p=(unsigned char *)s->init_buf->data;
854                 *(p++)=SSL3_MT_HELLO_REQUEST;
855                 *(p++)=0;
856                 *(p++)=0;
857                 *(p++)=0;
858
859                 s->state=SSL3_ST_SW_HELLO_REQ_B;
860                 /* number of bytes to write */
861                 s->init_num=4;
862                 s->init_off=0;
863                 }
864
865         /* SSL3_ST_SW_HELLO_REQ_B */
866         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
867         }
868
869 int ssl3_check_client_hello(SSL *s)
870         {
871         int ok;
872         long n;
873
874         /* this function is called when we really expect a Certificate message,
875          * so permit appropriate message length */
876         n=s->method->ssl_get_message(s,
877                 SSL3_ST_SR_CERT_A,
878                 SSL3_ST_SR_CERT_B,
879                 -1,
880                 s->max_cert_list,
881                 &ok);
882         if (!ok) return((int)n);
883         s->s3->tmp.reuse_message = 1;
884         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
885                 {
886                 /* Throw away what we have done so far in the current handshake,
887                  * which will now be aborted. (A full SSL_clear would be too much.) */
888 #ifndef OPENSSL_NO_DH
889                 if (s->s3->tmp.dh != NULL)
890                         {
891                         DH_free(s->s3->tmp.dh);
892                         s->s3->tmp.dh = NULL;
893                         }
894 #endif
895 #ifndef OPENSSL_NO_ECDH
896                 if (s->s3->tmp.ecdh != NULL)
897                         {
898                         EC_KEY_free(s->s3->tmp.ecdh);
899                         s->s3->tmp.ecdh = NULL;
900                         }
901 #endif
902                 return 2;
903                 }
904         return 1;
905 }
906
907 int ssl3_get_client_hello(SSL *s)
908         {
909         int i,j,ok,al,ret= -1;
910         unsigned int cookie_len;
911         long n;
912         unsigned long id;
913         unsigned char *p,*d,*q;
914         SSL_CIPHER *c;
915 #ifndef OPENSSL_NO_COMP
916         SSL_COMP *comp=NULL;
917 #endif
918         STACK_OF(SSL_CIPHER) *ciphers=NULL;
919
920         /* We do this so that we will respond with our native type.
921          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
922          * This down switching should be handled by a different method.
923          * If we are SSLv3, we will respond with SSLv3, even if prompted with
924          * TLSv1.
925          */
926         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
927                 )
928                 {
929                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
930                 }
931         s->first_packet=1;
932         n=s->method->ssl_get_message(s,
933                 SSL3_ST_SR_CLNT_HELLO_B,
934                 SSL3_ST_SR_CLNT_HELLO_C,
935                 SSL3_MT_CLIENT_HELLO,
936                 SSL3_RT_MAX_PLAIN_LENGTH,
937                 &ok);
938
939         if (!ok) return((int)n);
940         s->first_packet=0;
941         d=p=(unsigned char *)s->init_msg;
942
943         /* use version from inside client hello, not from record header
944          * (may differ: see RFC 2246, Appendix E, second paragraph) */
945         s->client_version=(((int)p[0])<<8)|(int)p[1];
946         p+=2;
947
948         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
949             (s->version != DTLS1_VERSION && s->client_version < s->version))
950                 {
951                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
952                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
953                         {
954                         /* similar to ssl3_get_record, send alert using remote version number */
955                         s->version = s->client_version;
956                         }
957                 al = SSL_AD_PROTOCOL_VERSION;
958                 goto f_err;
959                 }
960
961         /* If we require cookies and this ClientHello doesn't
962          * contain one, just return since we do not want to
963          * allocate any memory yet. So check cookie length...
964          */
965         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
966                 {
967                 unsigned int session_length, cookie_length;
968                 
969                 session_length = *(p + SSL3_RANDOM_SIZE);
970                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
971
972                 if (cookie_length == 0)
973                         return 1;
974                 }
975
976         /* load the client random */
977         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
978         p+=SSL3_RANDOM_SIZE;
979
980         /* get the session-id */
981         j= *(p++);
982
983         s->hit=0;
984         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
985          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
986          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
987          * than a change to default behavior so that applications relying on this for security
988          * won't even compile against older library versions).
989          *
990          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
991          * renegotiation but not a new session (s->new_session remains unset): for servers,
992          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
993          * setting will be ignored.
994          */
995         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
996                 {
997                 if (!ssl_get_new_session(s,1))
998                         goto err;
999                 }
1000         else
1001                 {
1002                 i=ssl_get_prev_session(s, p, j, d + n);
1003                 if (i == 1)
1004                         { /* previous session */
1005                         s->hit=1;
1006                         }
1007                 else if (i == -1)
1008                         goto err;
1009                 else /* i == 0 */
1010                         {
1011                         if (!ssl_get_new_session(s,1))
1012                                 goto err;
1013                         }
1014                 }
1015
1016         p+=j;
1017
1018         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1019                 {
1020                 /* cookie stuff */
1021                 cookie_len = *(p++);
1022
1023                 /* 
1024                  * The ClientHello may contain a cookie even if the
1025                  * HelloVerify message has not been sent--make sure that it
1026                  * does not cause an overflow.
1027                  */
1028                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1029                         {
1030                         /* too much data */
1031                         al = SSL_AD_DECODE_ERROR;
1032                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1033                         goto f_err;
1034                         }
1035
1036                 /* verify the cookie if appropriate option is set. */
1037                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1038                         cookie_len > 0)
1039                         {
1040                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1041
1042                         if ( s->ctx->app_verify_cookie_cb != NULL)
1043                                 {
1044                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1045                                         cookie_len) == 0)
1046                                         {
1047                                         al=SSL_AD_HANDSHAKE_FAILURE;
1048                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1049                                                 SSL_R_COOKIE_MISMATCH);
1050                                         goto f_err;
1051                                         }
1052                                 /* else cookie verification succeeded */
1053                                 }
1054                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1055                                                   s->d1->cookie_len) != 0) /* default verification */
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
1063                         ret = 2;
1064                         }
1065
1066                 p += cookie_len;
1067                 }
1068
1069         n2s(p,i);
1070         if ((i == 0) && (j != 0))
1071                 {
1072                 /* we need a cipher if we are not resuming a session */
1073                 al=SSL_AD_ILLEGAL_PARAMETER;
1074                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1075                 goto f_err;
1076                 }
1077         if ((p+i) >= (d+n))
1078                 {
1079                 /* not enough data */
1080                 al=SSL_AD_DECODE_ERROR;
1081                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1082                 goto f_err;
1083                 }
1084         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1085                 == NULL))
1086                 {
1087                 goto err;
1088                 }
1089         p+=i;
1090
1091         /* If it is a hit, check that the cipher is in the list */
1092         if ((s->hit) && (i > 0))
1093                 {
1094                 j=0;
1095                 id=s->session->cipher->id;
1096
1097 #ifdef CIPHER_DEBUG
1098                 printf("client sent %d ciphers\n",sk_num(ciphers));
1099 #endif
1100                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1101                         {
1102                         c=sk_SSL_CIPHER_value(ciphers,i);
1103 #ifdef CIPHER_DEBUG
1104                         printf("client [%2d of %2d]:%s\n",
1105                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1106 #endif
1107                         if (c->id == id)
1108                                 {
1109                                 j=1;
1110                                 break;
1111                                 }
1112                         }
1113 /* Disabled because it can be used in a ciphersuite downgrade
1114  * attack: CVE-2010-4180.
1115  */
1116 #if 0
1117                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1118                         {
1119                         /* Special case as client bug workaround: the previously used cipher may
1120                          * not be in the current list, the client instead might be trying to
1121                          * continue using a cipher that before wasn't chosen due to server
1122                          * preferences.  We'll have to reject the connection if the cipher is not
1123                          * enabled, though. */
1124                         c = sk_SSL_CIPHER_value(ciphers, 0);
1125                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1126                                 {
1127                                 s->session->cipher = c;
1128                                 j = 1;
1129                                 }
1130                         }
1131 #endif
1132                 if (j == 0)
1133                         {
1134                         /* we need to have the cipher in the cipher
1135                          * list if we are asked to reuse it */
1136                         al=SSL_AD_ILLEGAL_PARAMETER;
1137                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1138                         goto f_err;
1139                         }
1140                 }
1141
1142         /* compression */
1143         i= *(p++);
1144         if ((p+i) > (d+n))
1145                 {
1146                 /* not enough data */
1147                 al=SSL_AD_DECODE_ERROR;
1148                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1149                 goto f_err;
1150                 }
1151         q=p;
1152         for (j=0; j<i; j++)
1153                 {
1154                 if (p[j] == 0) break;
1155                 }
1156
1157         p+=i;
1158         if (j >= i)
1159                 {
1160                 /* no compress */
1161                 al=SSL_AD_DECODE_ERROR;
1162                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1163                 goto f_err;
1164                 }
1165
1166 #ifndef OPENSSL_NO_TLSEXT
1167         /* TLS extensions*/
1168         if (s->version >= SSL3_VERSION)
1169                 {
1170                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1171                         {
1172                         /* 'al' set by ssl_parse_clienthello_tlsext */
1173                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1174                         goto f_err;
1175                         }
1176                 }
1177                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1178                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1179                         goto err;
1180                 }
1181
1182         /* Check if we want to use external pre-shared secret for this
1183          * handshake for not reused session only. We need to generate
1184          * server_random before calling tls_session_secret_cb in order to allow
1185          * SessionTicket processing to use it in key derivation. */
1186         {
1187                 unsigned long Time;
1188                 unsigned char *pos;
1189                 Time=(unsigned long)time(NULL);                 /* Time */
1190                 pos=s->s3->server_random;
1191                 l2n(Time,pos);
1192                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1193                         {
1194                         al=SSL_AD_INTERNAL_ERROR;
1195                         goto f_err;
1196                         }
1197         }
1198
1199         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1200                 {
1201                 SSL_CIPHER *pref_cipher=NULL;
1202
1203                 s->session->master_key_length=sizeof(s->session->master_key);
1204                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1205                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1206                         {
1207                         s->hit=1;
1208                         s->session->ciphers=ciphers;
1209                         s->session->verify_result=X509_V_OK;
1210
1211                         ciphers=NULL;
1212
1213                         /* check if some cipher was preferred by call back */
1214                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1215                         if (pref_cipher == NULL)
1216                                 {
1217                                 al=SSL_AD_HANDSHAKE_FAILURE;
1218                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1219                                 goto f_err;
1220                                 }
1221
1222                         s->session->cipher=pref_cipher;
1223
1224                         if (s->cipher_list)
1225                                 sk_SSL_CIPHER_free(s->cipher_list);
1226
1227                         if (s->cipher_list_by_id)
1228                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1229
1230                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1231                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1232                         }
1233                 }
1234 #endif
1235
1236         /* Worst case, we will use the NULL compression, but if we have other
1237          * options, we will now look for them.  We have i-1 compression
1238          * algorithms from the client, starting at q. */
1239         s->s3->tmp.new_compression=NULL;
1240 #ifndef OPENSSL_NO_COMP
1241         /* This only happens if we have a cache hit */
1242         if (s->session->compress_meth != 0)
1243                 {
1244                 int m, comp_id = s->session->compress_meth;
1245                 /* Perform sanity checks on resumed compression algorithm */
1246                 /* Can't disable compression */
1247                 if (s->options & SSL_OP_NO_COMPRESSION)
1248                         {
1249                         al=SSL_AD_INTERNAL_ERROR;
1250                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1251                         goto f_err;
1252                         }
1253                 /* Look for resumed compression method */
1254                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1255                         {
1256                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1257                         if (comp_id == comp->id)
1258                                 {
1259                                 s->s3->tmp.new_compression=comp;
1260                                 break;
1261                                 }
1262                         }
1263                 if (s->s3->tmp.new_compression == NULL)
1264                         {
1265                         al=SSL_AD_INTERNAL_ERROR;
1266                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1267                         goto f_err;
1268                         }
1269                 /* Look for resumed method in compression list */
1270                 for (m = 0; m < i; m++)
1271                         {
1272                         if (q[m] == comp_id)
1273                                 break;
1274                         }
1275                 if (m >= i)
1276                         {
1277                         al=SSL_AD_ILLEGAL_PARAMETER;
1278                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1279                         goto f_err;
1280                         }
1281                 }
1282         else if (s->hit)
1283                 comp = NULL;
1284         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1285                 { /* See if we have a match */
1286                 int m,nn,o,v,done=0;
1287
1288                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1289                 for (m=0; m<nn; m++)
1290                         {
1291                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1292                         v=comp->id;
1293                         for (o=0; o<i; o++)
1294                                 {
1295                                 if (v == q[o])
1296                                         {
1297                                         done=1;
1298                                         break;
1299                                         }
1300                                 }
1301                         if (done) break;
1302                         }
1303                 if (done)
1304                         s->s3->tmp.new_compression=comp;
1305                 else
1306                         comp=NULL;
1307                 }
1308 #else
1309         /* If compression is disabled we'd better not try to resume a session
1310          * using compression.
1311          */
1312         if (s->session->compress_meth != 0)
1313                 {
1314                 al=SSL_AD_INTERNAL_ERROR;
1315                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1316                 goto f_err;
1317                 }
1318 #endif
1319
1320         /* Given s->session->ciphers and SSL_get_ciphers, we must
1321          * pick a cipher */
1322
1323         if (!s->hit)
1324                 {
1325 #ifdef OPENSSL_NO_COMP
1326                 s->session->compress_meth=0;
1327 #else
1328                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1329 #endif
1330                 if (s->session->ciphers != NULL)
1331                         sk_SSL_CIPHER_free(s->session->ciphers);
1332                 s->session->ciphers=ciphers;
1333                 if (ciphers == NULL)
1334                         {
1335                         al=SSL_AD_ILLEGAL_PARAMETER;
1336                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1337                         goto f_err;
1338                         }
1339                 ciphers=NULL;
1340                 c=ssl3_choose_cipher(s,s->session->ciphers,
1341                                      SSL_get_ciphers(s));
1342
1343                 if (c == NULL)
1344                         {
1345                         al=SSL_AD_HANDSHAKE_FAILURE;
1346                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1347                         goto f_err;
1348                         }
1349                 s->s3->tmp.new_cipher=c;
1350                 /* check whether we should disable session resumption */
1351                 if (s->not_resumable_session_cb != NULL)
1352                         s->session->not_resumable=s->not_resumable_session_cb(s,
1353                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1354                 if (s->session->not_resumable)
1355                         /* do not send a session ticket */
1356                         s->tlsext_ticket_expected = 0;
1357                 }
1358         else
1359                 {
1360                 /* Session-id reuse */
1361 #ifdef REUSE_CIPHER_BUG
1362                 STACK_OF(SSL_CIPHER) *sk;
1363                 SSL_CIPHER *nc=NULL;
1364                 SSL_CIPHER *ec=NULL;
1365
1366                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1367                         {
1368                         sk=s->session->ciphers;
1369                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1370                                 {
1371                                 c=sk_SSL_CIPHER_value(sk,i);
1372                                 if (c->algorithm_enc & SSL_eNULL)
1373                                         nc=c;
1374                                 if (SSL_C_IS_EXPORT(c))
1375                                         ec=c;
1376                                 }
1377                         if (nc != NULL)
1378                                 s->s3->tmp.new_cipher=nc;
1379                         else if (ec != NULL)
1380                                 s->s3->tmp.new_cipher=ec;
1381                         else
1382                                 s->s3->tmp.new_cipher=s->session->cipher;
1383                         }
1384                 else
1385 #endif
1386                 s->s3->tmp.new_cipher=s->session->cipher;
1387                 }
1388
1389         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1390                 {
1391                 if (!ssl3_digest_cached_records(s))
1392                         goto f_err;
1393                 }
1394         
1395         /* we now have the following setup. 
1396          * client_random
1397          * cipher_list          - our prefered list of ciphers
1398          * ciphers              - the clients prefered list of ciphers
1399          * compression          - basically ignored right now
1400          * ssl version is set   - sslv3
1401          * s->session           - The ssl session has been setup.
1402          * s->hit               - session reuse flag
1403          * s->tmp.new_cipher    - the new cipher to use.
1404          */
1405
1406         if (ret < 0) ret=1;
1407         if (0)
1408                 {
1409 f_err:
1410                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1411                 }
1412 err:
1413         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1414         return(ret);
1415         }
1416
1417 int ssl3_send_server_hello(SSL *s)
1418         {
1419         unsigned char *buf;
1420         unsigned char *p,*d;
1421         int i,sl;
1422         unsigned long l;
1423 #ifdef OPENSSL_NO_TLSEXT
1424         unsigned long Time;
1425 #endif
1426
1427         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1428                 {
1429                 buf=(unsigned char *)s->init_buf->data;
1430 #ifdef OPENSSL_NO_TLSEXT
1431                 p=s->s3->server_random;
1432                 /* Generate server_random if it was not needed previously */
1433                 Time=(unsigned long)time(NULL);                 /* Time */
1434                 l2n(Time,p);
1435                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1436                         return -1;
1437 #endif
1438                 /* Do the message type and length last */
1439                 d=p= &(buf[4]);
1440
1441                 *(p++)=s->version>>8;
1442                 *(p++)=s->version&0xff;
1443
1444                 /* Random stuff */
1445                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1446                 p+=SSL3_RANDOM_SIZE;
1447
1448                 /* There are several cases for the session ID to send
1449                  * back in the server hello:
1450                  * - For session reuse from the session cache,
1451                  *   we send back the old session ID.
1452                  * - If stateless session reuse (using a session ticket)
1453                  *   is successful, we send back the client's "session ID"
1454                  *   (which doesn't actually identify the session).
1455                  * - If it is a new session, we send back the new
1456                  *   session ID.
1457                  * - However, if we want the new session to be single-use,
1458                  *   we send back a 0-length session ID.
1459                  * s->hit is non-zero in either case of session reuse,
1460                  * so the following won't overwrite an ID that we're supposed
1461                  * to send back.
1462                  */
1463                 if (s->session->not_resumable ||
1464                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1465                                 && !s->hit))
1466                         s->session->session_id_length=0;
1467
1468                 sl=s->session->session_id_length;
1469                 if (sl > (int)sizeof(s->session->session_id))
1470                         {
1471                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1472                         return -1;
1473                         }
1474                 *(p++)=sl;
1475                 memcpy(p,s->session->session_id,sl);
1476                 p+=sl;
1477
1478                 /* put the cipher */
1479                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1480                 p+=i;
1481
1482                 /* put the compression method */
1483 #ifdef OPENSSL_NO_COMP
1484                         *(p++)=0;
1485 #else
1486                 if (s->s3->tmp.new_compression == NULL)
1487                         *(p++)=0;
1488                 else
1489                         *(p++)=s->s3->tmp.new_compression->id;
1490 #endif
1491 #ifndef OPENSSL_NO_TLSEXT
1492                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1493                         {
1494                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1495                         return -1;
1496                         }
1497                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1498                         {
1499                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1500                         return -1;
1501                         }
1502 #endif
1503                 /* do the header */
1504                 l=(p-d);
1505                 d=buf;
1506                 *(d++)=SSL3_MT_SERVER_HELLO;
1507                 l2n3(l,d);
1508
1509                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1510                 /* number of bytes to write */
1511                 s->init_num=p-buf;
1512                 s->init_off=0;
1513                 }
1514
1515         /* SSL3_ST_SW_SRVR_HELLO_B */
1516         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1517         }
1518
1519 int ssl3_send_server_done(SSL *s)
1520         {
1521         unsigned char *p;
1522
1523         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1524                 {
1525                 p=(unsigned char *)s->init_buf->data;
1526
1527                 /* do the header */
1528                 *(p++)=SSL3_MT_SERVER_DONE;
1529                 *(p++)=0;
1530                 *(p++)=0;
1531                 *(p++)=0;
1532
1533                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1534                 /* number of bytes to write */
1535                 s->init_num=4;
1536                 s->init_off=0;
1537                 }
1538
1539         /* SSL3_ST_SW_SRVR_DONE_B */
1540         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1541         }
1542
1543 int ssl3_send_server_key_exchange(SSL *s)
1544         {
1545 #ifndef OPENSSL_NO_RSA
1546         unsigned char *q;
1547         int j,num;
1548         RSA *rsa;
1549         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1550         unsigned int u;
1551 #endif
1552 #ifndef OPENSSL_NO_DH
1553         DH *dh=NULL,*dhp;
1554 #endif
1555 #ifndef OPENSSL_NO_ECDH
1556         EC_KEY *ecdh=NULL, *ecdhp;
1557         unsigned char *encodedPoint = NULL;
1558         int encodedlen = 0;
1559         int curve_id = 0;
1560         BN_CTX *bn_ctx = NULL; 
1561 #endif
1562         EVP_PKEY *pkey;
1563         const EVP_MD *md = NULL;
1564         unsigned char *p,*d;
1565         int al,i;
1566         unsigned long type;
1567         int n;
1568         CERT *cert;
1569         BIGNUM *r[4];
1570         int nr[4],kn;
1571         BUF_MEM *buf;
1572         EVP_MD_CTX md_ctx;
1573
1574         EVP_MD_CTX_init(&md_ctx);
1575         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1576                 {
1577                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1578                 cert=s->cert;
1579
1580                 buf=s->init_buf;
1581
1582                 r[0]=r[1]=r[2]=r[3]=NULL;
1583                 n=0;
1584 #ifndef OPENSSL_NO_RSA
1585                 if (type & SSL_kRSA)
1586                         {
1587                         rsa=cert->rsa_tmp;
1588                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1589                                 {
1590                                 rsa=s->cert->rsa_tmp_cb(s,
1591                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1592                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1593                                 if(rsa == NULL)
1594                                 {
1595                                         al=SSL_AD_HANDSHAKE_FAILURE;
1596                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1597                                         goto f_err;
1598                                 }
1599                                 RSA_up_ref(rsa);
1600                                 cert->rsa_tmp=rsa;
1601                                 }
1602                         if (rsa == NULL)
1603                                 {
1604                                 al=SSL_AD_HANDSHAKE_FAILURE;
1605                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1606                                 goto f_err;
1607                                 }
1608                         r[0]=rsa->n;
1609                         r[1]=rsa->e;
1610                         s->s3->tmp.use_rsa_tmp=1;
1611                         }
1612                 else
1613 #endif
1614 #ifndef OPENSSL_NO_DH
1615                         if (type & SSL_kEDH)
1616                         {
1617                         dhp=cert->dh_tmp;
1618                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1619                                 dhp=s->cert->dh_tmp_cb(s,
1620                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1621                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1622                         if (dhp == NULL)
1623                                 {
1624                                 al=SSL_AD_HANDSHAKE_FAILURE;
1625                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1626                                 goto f_err;
1627                                 }
1628
1629                         if (s->s3->tmp.dh != NULL)
1630                                 {
1631                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1632                                 goto err;
1633                                 }
1634
1635                         if ((dh=DHparams_dup(dhp)) == NULL)
1636                                 {
1637                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1638                                 goto err;
1639                                 }
1640
1641                         s->s3->tmp.dh=dh;
1642                         if ((dhp->pub_key == NULL ||
1643                              dhp->priv_key == NULL ||
1644                              (s->options & SSL_OP_SINGLE_DH_USE)))
1645                                 {
1646                                 if(!DH_generate_key(dh))
1647                                     {
1648                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1649                                            ERR_R_DH_LIB);
1650                                     goto err;
1651                                     }
1652                                 }
1653                         else
1654                                 {
1655                                 dh->pub_key=BN_dup(dhp->pub_key);
1656                                 dh->priv_key=BN_dup(dhp->priv_key);
1657                                 if ((dh->pub_key == NULL) ||
1658                                         (dh->priv_key == NULL))
1659                                         {
1660                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1661                                         goto err;
1662                                         }
1663                                 }
1664                         r[0]=dh->p;
1665                         r[1]=dh->g;
1666                         r[2]=dh->pub_key;
1667                         }
1668                 else 
1669 #endif
1670 #ifndef OPENSSL_NO_ECDH
1671                         if (type & SSL_kEECDH)
1672                         {
1673                         const EC_GROUP *group;
1674
1675                         ecdhp=cert->ecdh_tmp;
1676                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1677                                 {
1678                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1679                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1680                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1681                                 }
1682                         if (ecdhp == NULL)
1683                                 {
1684                                 al=SSL_AD_HANDSHAKE_FAILURE;
1685                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1686                                 goto f_err;
1687                                 }
1688
1689                         if (s->s3->tmp.ecdh != NULL)
1690                                 {
1691                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1692                                 goto err;
1693                                 }
1694
1695                         /* Duplicate the ECDH structure. */
1696                         if (ecdhp == NULL)
1697                                 {
1698                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1699                                 goto err;
1700                                 }
1701                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1702                                 {
1703                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1704                                 goto err;
1705                                 }
1706
1707                         s->s3->tmp.ecdh=ecdh;
1708                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1709                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1710                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1711                                 {
1712                                 if(!EC_KEY_generate_key(ecdh))
1713                                     {
1714                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1715                                     goto err;
1716                                     }
1717                                 }
1718
1719                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1720                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1721                             (EC_KEY_get0_private_key(ecdh) == NULL))
1722                                 {
1723                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1724                                 goto err;
1725                                 }
1726
1727                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1728                             (EC_GROUP_get_degree(group) > 163)) 
1729                                 {
1730                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1731                                 goto err;
1732                                 }
1733
1734                         /* XXX: For now, we only support ephemeral ECDH
1735                          * keys over named (not generic) curves. For 
1736                          * supported named curves, curve_id is non-zero.
1737                          */
1738                         if ((curve_id = 
1739                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1740                             == 0)
1741                                 {
1742                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1743                                 goto err;
1744                                 }
1745
1746                         /* Encode the public key.
1747                          * First check the size of encoding and
1748                          * allocate memory accordingly.
1749                          */
1750                         encodedlen = EC_POINT_point2oct(group, 
1751                             EC_KEY_get0_public_key(ecdh),
1752                             POINT_CONVERSION_UNCOMPRESSED, 
1753                             NULL, 0, NULL);
1754
1755                         encodedPoint = (unsigned char *) 
1756                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1757                         bn_ctx = BN_CTX_new();
1758                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1759                                 {
1760                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1761                                 goto err;
1762                                 }
1763
1764
1765                         encodedlen = EC_POINT_point2oct(group, 
1766                             EC_KEY_get0_public_key(ecdh), 
1767                             POINT_CONVERSION_UNCOMPRESSED, 
1768                             encodedPoint, encodedlen, bn_ctx);
1769
1770                         if (encodedlen == 0) 
1771                                 {
1772                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1773                                 goto err;
1774                                 }
1775
1776                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1777
1778                         /* XXX: For now, we only support named (not 
1779                          * generic) curves in ECDH ephemeral key exchanges.
1780                          * In this situation, we need four additional bytes
1781                          * to encode the entire ServerECDHParams
1782                          * structure. 
1783                          */
1784                         n = 4 + encodedlen;
1785
1786                         /* We'll generate the serverKeyExchange message
1787                          * explicitly so we can set these to NULLs
1788                          */
1789                         r[0]=NULL;
1790                         r[1]=NULL;
1791                         r[2]=NULL;
1792                         r[3]=NULL;
1793                         }
1794                 else 
1795 #endif /* !OPENSSL_NO_ECDH */
1796 #ifndef OPENSSL_NO_PSK
1797                         if (type & SSL_kPSK)
1798                                 {
1799                                 /* reserve size for record length and PSK identity hint*/
1800                                 n+=2+strlen(s->ctx->psk_identity_hint);
1801                                 }
1802                         else
1803 #endif /* !OPENSSL_NO_PSK */
1804 #ifndef OPENSSL_NO_SRP
1805                 if (type & SSL_kSRP)
1806                         {
1807                         if ((s->srp_ctx.N == NULL) ||
1808                                 (s->srp_ctx.g == NULL) ||
1809                                 (s->srp_ctx.s == NULL) ||
1810                                 (s->srp_ctx.B == NULL))
1811                                 {
1812                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1813                                 goto err;
1814                                 }
1815                         r[0]=s->srp_ctx.N;
1816                         r[1]=s->srp_ctx.g;
1817                         r[2]=s->srp_ctx.s;
1818                         r[3]=s->srp_ctx.B;
1819                         }
1820                 else 
1821 #endif
1822                         {
1823                         al=SSL_AD_HANDSHAKE_FAILURE;
1824                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1825                         goto f_err;
1826                         }
1827                 for (i=0; r[i] != NULL && i<4; i++)
1828                         {
1829                         nr[i]=BN_num_bytes(r[i]);
1830 #ifndef OPENSSL_NO_SRP
1831                         if ((i == 2) && (type & SSL_kSRP))
1832                                 n+=1+nr[i];
1833                         else
1834 #endif
1835                         n+=2+nr[i];
1836                         }
1837
1838                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1839                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1840                         {
1841                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1842                                 == NULL)
1843                                 {
1844                                 al=SSL_AD_DECODE_ERROR;
1845                                 goto f_err;
1846                                 }
1847                         kn=EVP_PKEY_size(pkey);
1848                         }
1849                 else
1850                         {
1851                         pkey=NULL;
1852                         kn=0;
1853                         }
1854
1855                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1856                         {
1857                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1858                         goto err;
1859                         }
1860                 d=(unsigned char *)s->init_buf->data;
1861                 p= &(d[4]);
1862
1863                 for (i=0; r[i] != NULL && i<4; i++)
1864                         {
1865 #ifndef OPENSSL_NO_SRP
1866                         if ((i == 2) && (type & SSL_kSRP))
1867                                 {
1868                                 *p = nr[i];
1869                                 p++;
1870                                 }
1871                         else
1872 #endif
1873                         s2n(nr[i],p);
1874                         BN_bn2bin(r[i],p);
1875                         p+=nr[i];
1876                         }
1877
1878 #ifndef OPENSSL_NO_ECDH
1879                 if (type & SSL_kEECDH) 
1880                         {
1881                         /* XXX: For now, we only support named (not generic) curves.
1882                          * In this situation, the serverKeyExchange message has:
1883                          * [1 byte CurveType], [2 byte CurveName]
1884                          * [1 byte length of encoded point], followed by
1885                          * the actual encoded point itself
1886                          */
1887                         *p = NAMED_CURVE_TYPE;
1888                         p += 1;
1889                         *p = 0;
1890                         p += 1;
1891                         *p = curve_id;
1892                         p += 1;
1893                         *p = encodedlen;
1894                         p += 1;
1895                         memcpy((unsigned char*)p, 
1896                             (unsigned char *)encodedPoint, 
1897                             encodedlen);
1898                         OPENSSL_free(encodedPoint);
1899                         encodedPoint = NULL;
1900                         p += encodedlen;
1901                         }
1902 #endif
1903
1904 #ifndef OPENSSL_NO_PSK
1905                 if (type & SSL_kPSK)
1906                         {
1907                         /* copy PSK identity hint */
1908                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1909                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1910                         p+=strlen(s->ctx->psk_identity_hint);
1911                         }
1912 #endif
1913
1914                 /* not anonymous */
1915                 if (pkey != NULL)
1916                         {
1917                         /* n is the length of the params, they start at &(d[4])
1918                          * and p points to the space at the end. */
1919 #ifndef OPENSSL_NO_RSA
1920                         if (pkey->type == EVP_PKEY_RSA
1921                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1922                                 {
1923                                 q=md_buf;
1924                                 j=0;
1925                                 for (num=2; num > 0; num--)
1926                                         {
1927                                         EVP_MD_CTX_set_flags(&md_ctx,
1928                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1929                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1930                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1931                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1932                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1933                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1934                                         EVP_DigestFinal_ex(&md_ctx,q,
1935                                                 (unsigned int *)&i);
1936                                         q+=i;
1937                                         j+=i;
1938                                         }
1939                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1940                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1941                                         {
1942                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1943                                         goto err;
1944                                         }
1945                                 s2n(u,p);
1946                                 n+=u+2;
1947                                 }
1948                         else
1949 #endif
1950                         if (md)
1951                                 {
1952                                 /* For TLS1.2 and later send signature
1953                                  * algorithm */
1954                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1955                                         {
1956                                         if (!tls12_get_sigandhash(p, pkey, md))
1957                                                 {
1958                                                 /* Should never happen */
1959                                                 al=SSL_AD_INTERNAL_ERROR;
1960                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1961                                                 goto f_err;
1962                                                 }
1963                                         p+=2;
1964                                         }
1965 #ifdef SSL_DEBUG
1966                                 fprintf(stderr, "Using hash %s\n",
1967                                                         EVP_MD_name(md));
1968 #endif
1969                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1970                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1971                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1972                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1973                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1974                                         (unsigned int *)&i,pkey))
1975                                         {
1976                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1977                                         goto err;
1978                                         }
1979                                 s2n(i,p);
1980                                 n+=i+2;
1981                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1982                                         n+= 2;
1983                                 }
1984                         else
1985                                 {
1986                                 /* Is this error check actually needed? */
1987                                 al=SSL_AD_HANDSHAKE_FAILURE;
1988                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1989                                 goto f_err;
1990                                 }
1991                         }
1992
1993                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1994                 l2n3(n,d);
1995
1996                 /* we should now have things packed up, so lets send
1997                  * it off */
1998                 s->init_num=n+4;
1999                 s->init_off=0;
2000                 }
2001
2002         s->state = SSL3_ST_SW_KEY_EXCH_B;
2003         EVP_MD_CTX_cleanup(&md_ctx);
2004         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2005 f_err:
2006         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2007 err:
2008 #ifndef OPENSSL_NO_ECDH
2009         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2010         BN_CTX_free(bn_ctx);
2011 #endif
2012         EVP_MD_CTX_cleanup(&md_ctx);
2013         return(-1);
2014         }
2015
2016 int ssl3_send_certificate_request(SSL *s)
2017         {
2018         unsigned char *p,*d;
2019         int i,j,nl,off,n;
2020         STACK_OF(X509_NAME) *sk=NULL;
2021         X509_NAME *name;
2022         BUF_MEM *buf;
2023
2024         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2025                 {
2026                 buf=s->init_buf;
2027
2028                 d=p=(unsigned char *)&(buf->data[4]);
2029
2030                 /* get the list of acceptable cert types */
2031                 p++;
2032                 n=ssl3_get_req_cert_type(s,p);
2033                 d[0]=n;
2034                 p+=n;
2035                 n++;
2036
2037                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2038                         {
2039                         nl = tls12_get_req_sig_algs(s, p + 2);
2040                         s2n(nl, p);
2041                         p += nl + 2;
2042                         n += nl + 2;
2043                         }
2044
2045                 off=n;
2046                 p+=2;
2047                 n+=2;
2048
2049                 sk=SSL_get_client_CA_list(s);
2050                 nl=0;
2051                 if (sk != NULL)
2052                         {
2053                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2054                                 {
2055                                 name=sk_X509_NAME_value(sk,i);
2056                                 j=i2d_X509_NAME(name,NULL);
2057                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2058                                         {
2059                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2060                                         goto err;
2061                                         }
2062                                 p=(unsigned char *)&(buf->data[4+n]);
2063                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2064                                         {
2065                                         s2n(j,p);
2066                                         i2d_X509_NAME(name,&p);
2067                                         n+=2+j;
2068                                         nl+=2+j;
2069                                         }
2070                                 else
2071                                         {
2072                                         d=p;
2073                                         i2d_X509_NAME(name,&p);
2074                                         j-=2; s2n(j,d); j+=2;
2075                                         n+=j;
2076                                         nl+=j;
2077                                         }
2078                                 }
2079                         }
2080                 /* else no CA names */
2081                 p=(unsigned char *)&(buf->data[4+off]);
2082                 s2n(nl,p);
2083
2084                 d=(unsigned char *)buf->data;
2085                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2086                 l2n3(n,d);
2087
2088                 /* we should now have things packed up, so lets send
2089                  * it off */
2090
2091                 s->init_num=n+4;
2092                 s->init_off=0;
2093 #ifdef NETSCAPE_HANG_BUG
2094                 p=(unsigned char *)s->init_buf->data + s->init_num;
2095
2096                 /* do the header */
2097                 *(p++)=SSL3_MT_SERVER_DONE;
2098                 *(p++)=0;
2099                 *(p++)=0;
2100                 *(p++)=0;
2101                 s->init_num += 4;
2102 #endif
2103
2104                 s->state = SSL3_ST_SW_CERT_REQ_B;
2105                 }
2106
2107         /* SSL3_ST_SW_CERT_REQ_B */
2108         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2109 err:
2110         return(-1);
2111         }
2112
2113 int ssl3_get_client_key_exchange(SSL *s)
2114         {
2115         int i,al,ok;
2116         long n;
2117         unsigned long alg_k;
2118         unsigned char *p;
2119 #ifndef OPENSSL_NO_RSA
2120         RSA *rsa=NULL;
2121         EVP_PKEY *pkey=NULL;
2122 #endif
2123 #ifndef OPENSSL_NO_DH
2124         BIGNUM *pub=NULL;
2125         DH *dh_srvr;
2126 #endif
2127 #ifndef OPENSSL_NO_KRB5
2128         KSSL_ERR kssl_err;
2129 #endif /* OPENSSL_NO_KRB5 */
2130
2131 #ifndef OPENSSL_NO_ECDH
2132         EC_KEY *srvr_ecdh = NULL;
2133         EVP_PKEY *clnt_pub_pkey = NULL;
2134         EC_POINT *clnt_ecpoint = NULL;
2135         BN_CTX *bn_ctx = NULL; 
2136 #endif
2137
2138         n=s->method->ssl_get_message(s,
2139                 SSL3_ST_SR_KEY_EXCH_A,
2140                 SSL3_ST_SR_KEY_EXCH_B,
2141                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2142                 2048, /* ??? */
2143                 &ok);
2144
2145         if (!ok) return((int)n);
2146         p=(unsigned char *)s->init_msg;
2147
2148         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2149
2150 #ifndef OPENSSL_NO_RSA
2151         if (alg_k & SSL_kRSA)
2152                 {
2153                 /* FIX THIS UP EAY EAY EAY EAY */
2154                 if (s->s3->tmp.use_rsa_tmp)
2155                         {
2156                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2157                                 rsa=s->cert->rsa_tmp;
2158                         /* Don't do a callback because rsa_tmp should
2159                          * be sent already */
2160                         if (rsa == NULL)
2161                                 {
2162                                 al=SSL_AD_HANDSHAKE_FAILURE;
2163                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2164                                 goto f_err;
2165
2166                                 }
2167                         }
2168                 else
2169                         {
2170                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2171                         if (    (pkey == NULL) ||
2172                                 (pkey->type != EVP_PKEY_RSA) ||
2173                                 (pkey->pkey.rsa == NULL))
2174                                 {
2175                                 al=SSL_AD_HANDSHAKE_FAILURE;
2176                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2177                                 goto f_err;
2178                                 }
2179                         rsa=pkey->pkey.rsa;
2180                         }
2181
2182                 /* TLS and [incidentally] DTLS{0xFEFF} */
2183                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2184                         {
2185                         n2s(p,i);
2186                         if (n != i+2)
2187                                 {
2188                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2189                                         {
2190                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2191                                         goto err;
2192                                         }
2193                                 else
2194                                         p-=2;
2195                                 }
2196                         else
2197                                 n=i;
2198                         }
2199
2200                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2201
2202                 al = -1;
2203                 
2204                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2205                         {
2206                         al=SSL_AD_DECODE_ERROR;
2207                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2208                         }
2209
2210                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2211                         {
2212                         /* The premaster secret must contain the same version number as the
2213                          * ClientHello to detect version rollback attacks (strangely, the
2214                          * protocol does not offer such protection for DH ciphersuites).
2215                          * However, buggy clients exist that send the negotiated protocol
2216                          * version instead if the server does not support the requested
2217                          * protocol version.
2218                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2219                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2220                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2221                                 {
2222                                 al=SSL_AD_DECODE_ERROR;
2223                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2224
2225                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2226                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2227                                  * number check as a "bad version oracle" -- an alert would
2228                                  * reveal that the plaintext corresponding to some ciphertext
2229                                  * made up by the adversary is properly formatted except
2230                                  * that the version number is wrong.  To avoid such attacks,
2231                                  * we should treat this just like any other decryption error. */
2232                                 }
2233                         }
2234
2235                 if (al != -1)
2236                         {
2237                         /* Some decryption failure -- use random value instead as countermeasure
2238                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2239                          * (see RFC 2246, section 7.4.7.1). */
2240                         ERR_clear_error();
2241                         i = SSL_MAX_MASTER_KEY_LENGTH;
2242                         p[0] = s->client_version >> 8;
2243                         p[1] = s->client_version & 0xff;
2244                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2245                                 goto err;
2246                         }
2247         
2248                 s->session->master_key_length=
2249                         s->method->ssl3_enc->generate_master_secret(s,
2250                                 s->session->master_key,
2251                                 p,i);
2252                 OPENSSL_cleanse(p,i);
2253                 }
2254         else
2255 #endif
2256 #ifndef OPENSSL_NO_DH
2257                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2258                 {
2259                 n2s(p,i);
2260                 if (n != i+2)
2261                         {
2262                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2263                                 {
2264                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2265                                 goto err;
2266                                 }
2267                         else
2268                                 {
2269                                 p-=2;
2270                                 i=(int)n;
2271                                 }
2272                         }
2273
2274                 if (n == 0L) /* the parameters are in the cert */
2275                         {
2276                         al=SSL_AD_HANDSHAKE_FAILURE;
2277                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2278                         goto f_err;
2279                         }
2280                 else
2281                         {
2282                         if (s->s3->tmp.dh == NULL)
2283                                 {
2284                                 al=SSL_AD_HANDSHAKE_FAILURE;
2285                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2286                                 goto f_err;
2287                                 }
2288                         else
2289                                 dh_srvr=s->s3->tmp.dh;
2290                         }
2291
2292                 pub=BN_bin2bn(p,i,NULL);
2293                 if (pub == NULL)
2294                         {
2295                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2296                         goto err;
2297                         }
2298
2299                 i=DH_compute_key(p,pub,dh_srvr);
2300
2301                 if (i <= 0)
2302                         {
2303                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2304                         goto err;
2305                         }
2306
2307                 DH_free(s->s3->tmp.dh);
2308                 s->s3->tmp.dh=NULL;
2309
2310                 BN_clear_free(pub);
2311                 pub=NULL;
2312                 s->session->master_key_length=
2313                         s->method->ssl3_enc->generate_master_secret(s,
2314                                 s->session->master_key,p,i);
2315                 OPENSSL_cleanse(p,i);
2316                 }
2317         else
2318 #endif
2319 #ifndef OPENSSL_NO_KRB5
2320         if (alg_k & SSL_kKRB5)
2321                 {
2322                 krb5_error_code         krb5rc;
2323                 krb5_data               enc_ticket;
2324                 krb5_data               authenticator;
2325                 krb5_data               enc_pms;
2326                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2327                 EVP_CIPHER_CTX          ciph_ctx;
2328                 const EVP_CIPHER        *enc = NULL;
2329                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2330                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2331                                                + EVP_MAX_BLOCK_LENGTH];
2332                 int                  padl, outl;
2333                 krb5_timestamp          authtime = 0;
2334                 krb5_ticket_times       ttimes;
2335
2336                 EVP_CIPHER_CTX_init(&ciph_ctx);
2337
2338                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2339
2340                 n2s(p,i);
2341                 enc_ticket.length = i;
2342
2343                 if (n < (long)(enc_ticket.length + 6))
2344                         {
2345                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2346                                 SSL_R_DATA_LENGTH_TOO_LONG);
2347                         goto err;
2348                         }
2349
2350                 enc_ticket.data = (char *)p;
2351                 p+=enc_ticket.length;
2352
2353                 n2s(p,i);
2354                 authenticator.length = i;
2355
2356                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2357                         {
2358                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2359                                 SSL_R_DATA_LENGTH_TOO_LONG);
2360                         goto err;
2361                         }
2362
2363                 authenticator.data = (char *)p;
2364                 p+=authenticator.length;
2365
2366                 n2s(p,i);
2367                 enc_pms.length = i;
2368                 enc_pms.data = (char *)p;
2369                 p+=enc_pms.length;
2370
2371                 /* Note that the length is checked again below,
2372                 ** after decryption
2373                 */
2374                 if(enc_pms.length > sizeof pms)
2375                         {
2376                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2377                                SSL_R_DATA_LENGTH_TOO_LONG);
2378                         goto err;
2379                         }
2380
2381                 if (n != (long)(enc_ticket.length + authenticator.length +
2382                                                 enc_pms.length + 6))
2383                         {
2384                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2385                                 SSL_R_DATA_LENGTH_TOO_LONG);
2386                         goto err;
2387                         }
2388
2389                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2390                                         &kssl_err)) != 0)
2391                         {
2392 #ifdef KSSL_DEBUG
2393                         printf("kssl_sget_tkt rtn %d [%d]\n",
2394                                 krb5rc, kssl_err.reason);
2395                         if (kssl_err.text)
2396                                 printf("kssl_err text= %s\n", kssl_err.text);
2397 #endif  /* KSSL_DEBUG */
2398                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2399                                 kssl_err.reason);
2400                         goto err;
2401                         }
2402
2403                 /*  Note: no authenticator is not considered an error,
2404                 **  but will return authtime == 0.
2405                 */
2406                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2407                                         &authtime, &kssl_err)) != 0)
2408                         {
2409 #ifdef KSSL_DEBUG
2410                         printf("kssl_check_authent rtn %d [%d]\n",
2411                                 krb5rc, kssl_err.reason);
2412                         if (kssl_err.text)
2413                                 printf("kssl_err text= %s\n", kssl_err.text);
2414 #endif  /* KSSL_DEBUG */
2415                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2416                                 kssl_err.reason);
2417                         goto err;
2418                         }
2419
2420                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2421                         {
2422                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2423                         goto err;
2424                         }
2425
2426 #ifdef KSSL_DEBUG
2427                 kssl_ctx_show(kssl_ctx);
2428 #endif  /* KSSL_DEBUG */
2429
2430                 enc = kssl_map_enc(kssl_ctx->enctype);
2431                 if (enc == NULL)
2432                     goto err;
2433
2434                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2435
2436                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2437                         {
2438                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2439                                 SSL_R_DECRYPTION_FAILED);
2440                         goto err;
2441                         }
2442                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2443                                         (unsigned char *)enc_pms.data, enc_pms.length))
2444                         {
2445                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2446                                 SSL_R_DECRYPTION_FAILED);
2447                         goto err;
2448                         }
2449                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2450                         {
2451                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2452                                 SSL_R_DATA_LENGTH_TOO_LONG);
2453                         goto err;
2454                         }
2455                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2456                         {
2457                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2458                                 SSL_R_DECRYPTION_FAILED);
2459                         goto err;
2460                         }
2461                 outl += padl;
2462                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2463                         {
2464                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2465                                 SSL_R_DATA_LENGTH_TOO_LONG);
2466                         goto err;
2467                         }
2468                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2469                     {
2470                     /* The premaster secret must contain the same version number as the
2471                      * ClientHello to detect version rollback attacks (strangely, the
2472                      * protocol does not offer such protection for DH ciphersuites).
2473                      * However, buggy clients exist that send random bytes instead of
2474                      * the protocol version.
2475                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2476                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2477                      */
2478                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2479                         {
2480                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2481                                SSL_AD_DECODE_ERROR);
2482                         goto err;
2483                         }
2484                     }
2485
2486                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2487
2488                 s->session->master_key_length=
2489                         s->method->ssl3_enc->generate_master_secret(s,
2490                                 s->session->master_key, pms, outl);
2491
2492                 if (kssl_ctx->client_princ)
2493                         {
2494                         size_t len = strlen(kssl_ctx->client_princ);
2495                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2496                                 {
2497                                 s->session->krb5_client_princ_len = len;
2498                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2499                                 }
2500                         }
2501
2502
2503                 /*  Was doing kssl_ctx_free() here,
2504                 **  but it caused problems for apache.
2505                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2506                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2507                 */
2508                 }
2509         else
2510 #endif  /* OPENSSL_NO_KRB5 */
2511
2512 #ifndef OPENSSL_NO_ECDH
2513                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2514                 {
2515                 int ret = 1;
2516                 int field_size = 0;
2517                 const EC_KEY   *tkey;
2518                 const EC_GROUP *group;
2519                 const BIGNUM *priv_key;
2520
2521                 /* initialize structures for server's ECDH key pair */
2522                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2523                         {
2524                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2525                             ERR_R_MALLOC_FAILURE);
2526                         goto err;
2527                         }
2528
2529                 /* Let's get server private key and group information */
2530                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2531                         { 
2532                         /* use the certificate */
2533                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2534                         }
2535                 else
2536                         {
2537                         /* use the ephermeral values we saved when
2538                          * generating the ServerKeyExchange msg.
2539                          */
2540                         tkey = s->s3->tmp.ecdh;
2541                         }
2542
2543                 group    = EC_KEY_get0_group(tkey);
2544                 priv_key = EC_KEY_get0_private_key(tkey);
2545
2546                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2547                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2548                         {
2549                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2550                                ERR_R_EC_LIB);
2551                         goto err;
2552                         }
2553
2554                 /* Let's get client's public key */
2555                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2556                         {
2557                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2558                             ERR_R_MALLOC_FAILURE);
2559                         goto err;
2560                         }
2561
2562                 if (n == 0L) 
2563                         {
2564                         /* Client Publickey was in Client Certificate */
2565
2566                          if (alg_k & SSL_kEECDH)
2567                                  {
2568                                  al=SSL_AD_HANDSHAKE_FAILURE;
2569                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2570                                  goto f_err;
2571                                  }
2572                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2573                             == NULL) || 
2574                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2575                                 {
2576                                 /* XXX: For now, we do not support client
2577                                  * authentication using ECDH certificates
2578                                  * so this branch (n == 0L) of the code is
2579                                  * never executed. When that support is
2580                                  * added, we ought to ensure the key 
2581                                  * received in the certificate is 
2582                                  * authorized for key agreement.
2583                                  * ECDH_compute_key implicitly checks that
2584                                  * the two ECDH shares are for the same
2585                                  * group.
2586                                  */
2587                                 al=SSL_AD_HANDSHAKE_FAILURE;
2588                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2589                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2590                                 goto f_err;
2591                                 }
2592
2593                         if (EC_POINT_copy(clnt_ecpoint,
2594                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2595                                 {
2596                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2597                                         ERR_R_EC_LIB);
2598                                 goto err;
2599                                 }
2600                         ret = 2; /* Skip certificate verify processing */
2601                         }
2602                 else
2603                         {
2604                         /* Get client's public key from encoded point
2605                          * in the ClientKeyExchange message.
2606                          */
2607                         if ((bn_ctx = BN_CTX_new()) == NULL)
2608                                 {
2609                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2610                                     ERR_R_MALLOC_FAILURE);
2611                                 goto err;
2612                                 }
2613
2614                         /* Get encoded point length */
2615                         i = *p; 
2616                         p += 1;
2617                         if (n != 1 + i)
2618                                 {
2619                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2620                                     ERR_R_EC_LIB);
2621                                 goto err;
2622                                 }
2623                         if (EC_POINT_oct2point(group, 
2624                             clnt_ecpoint, p, i, bn_ctx) == 0)
2625                                 {
2626                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2627                                     ERR_R_EC_LIB);
2628                                 goto err;
2629                                 }
2630                         /* p is pointing to somewhere in the buffer
2631                          * currently, so set it to the start 
2632                          */ 
2633                         p=(unsigned char *)s->init_buf->data;
2634                         }
2635
2636                 /* Compute the shared pre-master secret */
2637                 field_size = EC_GROUP_get_degree(group);
2638                 if (field_size <= 0)
2639                         {
2640                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2641                                ERR_R_ECDH_LIB);
2642                         goto err;
2643                         }
2644                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2645                 if (i <= 0)
2646                         {
2647                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2648                             ERR_R_ECDH_LIB);
2649                         goto err;
2650                         }
2651
2652                 EVP_PKEY_free(clnt_pub_pkey);
2653                 EC_POINT_free(clnt_ecpoint);
2654                 EC_KEY_free(srvr_ecdh);
2655                 BN_CTX_free(bn_ctx);
2656                 EC_KEY_free(s->s3->tmp.ecdh);
2657                 s->s3->tmp.ecdh = NULL; 
2658
2659                 /* Compute the master secret */
2660                 s->session->master_key_length = s->method->ssl3_enc-> \
2661                     generate_master_secret(s, s->session->master_key, p, i);
2662                 
2663                 OPENSSL_cleanse(p, i);
2664                 return (ret);
2665                 }
2666         else
2667 #endif
2668 #ifndef OPENSSL_NO_PSK
2669                 if (alg_k & SSL_kPSK)
2670                         {
2671                         unsigned char *t = NULL;
2672                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2673                         unsigned int pre_ms_len = 0, psk_len = 0;
2674                         int psk_err = 1;
2675                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2676
2677                         al=SSL_AD_HANDSHAKE_FAILURE;
2678
2679                         n2s(p,i);
2680                         if (n != i+2)
2681                                 {
2682                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2683                                         SSL_R_LENGTH_MISMATCH);
2684                                 goto psk_err;
2685                                 }
2686                         if (i > PSK_MAX_IDENTITY_LEN)
2687                                 {
2688                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2689                                         SSL_R_DATA_LENGTH_TOO_LONG);
2690                                 goto psk_err;
2691                                 }
2692                         if (s->psk_server_callback == NULL)
2693                                 {
2694                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2695                                        SSL_R_PSK_NO_SERVER_CB);
2696                                 goto psk_err;
2697                                 }
2698
2699                         /* Create guaranteed NULL-terminated identity
2700                          * string for the callback */
2701                         memcpy(tmp_id, p, i);
2702                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2703                         psk_len = s->psk_server_callback(s, tmp_id,
2704                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2705                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2706
2707                         if (psk_len > PSK_MAX_PSK_LEN)
2708                                 {
2709                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2710                                         ERR_R_INTERNAL_ERROR);
2711                                 goto psk_err;
2712                                 }
2713                         else if (psk_len == 0)
2714                                 {
2715                                 /* PSK related to the given identity not found */
2716                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2717                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2718                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2719                                 goto psk_err;
2720                                 }
2721
2722                         /* create PSK pre_master_secret */
2723                         pre_ms_len=2+psk_len+2+psk_len;
2724                         t = psk_or_pre_ms;
2725                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2726                         s2n(psk_len, t);
2727                         memset(t, 0, psk_len);
2728                         t+=psk_len;
2729                         s2n(psk_len, t);
2730
2731                         if (s->session->psk_identity != NULL)
2732                                 OPENSSL_free(s->session->psk_identity);
2733                         s->session->psk_identity = BUF_strdup((char *)p);
2734                         if (s->session->psk_identity == NULL)
2735                                 {
2736                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2737                                         ERR_R_MALLOC_FAILURE);
2738                                 goto psk_err;
2739                                 }
2740
2741                         if (s->session->psk_identity_hint != NULL)
2742                                 OPENSSL_free(s->session->psk_identity_hint);
2743                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2744                         if (s->ctx->psk_identity_hint != NULL &&
2745                                 s->session->psk_identity_hint == NULL)
2746                                 {
2747                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2748                                         ERR_R_MALLOC_FAILURE);
2749                                 goto psk_err;
2750                                 }
2751
2752                         s->session->master_key_length=
2753                                 s->method->ssl3_enc->generate_master_secret(s,
2754                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2755                         psk_err = 0;
2756                 psk_err:
2757                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2758                         if (psk_err != 0)
2759                                 goto f_err;
2760                         }
2761                 else
2762 #endif
2763 #ifndef OPENSSL_NO_SRP
2764                 if (alg_k & SSL_kSRP)
2765                         {
2766                         int param_len;
2767
2768                         n2s(p,i);
2769                         param_len=i+2;
2770                         if (param_len > n)
2771                                 {
2772                                 al=SSL_AD_DECODE_ERROR;
2773                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2774                                 goto f_err;
2775                                 }
2776                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2777                                 {
2778                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2779                                 goto err;
2780                                 }
2781                         if (s->session->srp_username != NULL)
2782                                 OPENSSL_free(s->session->srp_username);
2783                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2784                         if (s->session->srp_username == NULL)
2785                                 {
2786                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2787                                         ERR_R_MALLOC_FAILURE);
2788                                 goto err;
2789                                 }
2790
2791                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2792                                 {
2793                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2794                                 goto err;
2795                                 }
2796
2797                         p+=i;
2798                         }
2799                 else
2800 #endif  /* OPENSSL_NO_SRP */
2801                 if (alg_k & SSL_kGOST) 
2802                         {
2803                         int ret = 0;
2804                         EVP_PKEY_CTX *pkey_ctx;
2805                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2806                         unsigned char premaster_secret[32], *start;
2807                         size_t outlen=32, inlen;
2808                         unsigned long alg_a;
2809
2810                         /* Get our certificate private key*/
2811                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2812                         if (alg_a & SSL_aGOST94)
2813                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2814                         else if (alg_a & SSL_aGOST01)
2815                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2816
2817                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2818                         EVP_PKEY_decrypt_init(pkey_ctx);
2819                         /* If client certificate is present and is of the same type, maybe
2820                          * use it for key exchange.  Don't mind errors from
2821                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2822                          * a client certificate for authorization only. */
2823                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2824                         if (client_pub_pkey)
2825                                 {
2826                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2827                                         ERR_clear_error();
2828                                 }
2829                         /* Decrypt session key */
2830                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2831                                 {
2832                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2833                                 goto gerr;
2834                                 }
2835                         if (p[1] == 0x81)
2836                                 {
2837                                 start = p+3;
2838                                 inlen = p[2];
2839                                 }
2840                         else if (p[1] < 0x80)
2841                                 {
2842                                 start = p+2;
2843                                 inlen = p[1];
2844                                 }
2845                         else
2846                                 {
2847                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2848                                 goto gerr;
2849                                 }
2850                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2851
2852                                 {
2853                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2854                                 goto gerr;
2855                                 }
2856                         /* Generate master secret */
2857                         s->session->master_key_length=
2858                                 s->method->ssl3_enc->generate_master_secret(s,
2859                                         s->session->master_key,premaster_secret,32);
2860                         /* Check if pubkey from client certificate was used */
2861                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2862                                 ret = 2;
2863                         else
2864                                 ret = 1;
2865                 gerr:
2866                         EVP_PKEY_free(client_pub_pkey);
2867                         EVP_PKEY_CTX_free(pkey_ctx);
2868                         if (ret)
2869                                 return ret;
2870                         else
2871                                 goto err;
2872                         }
2873                 else
2874                 {
2875                 al=SSL_AD_HANDSHAKE_FAILURE;
2876                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2877                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2878                 goto f_err;
2879                 }
2880
2881         return(1);
2882 f_err:
2883         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2884 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2885 err:
2886 #endif
2887 #ifndef OPENSSL_NO_ECDH
2888         EVP_PKEY_free(clnt_pub_pkey);
2889         EC_POINT_free(clnt_ecpoint);
2890         if (srvr_ecdh != NULL) 
2891                 EC_KEY_free(srvr_ecdh);
2892         BN_CTX_free(bn_ctx);
2893 #endif
2894         return(-1);
2895         }
2896
2897 int ssl3_get_cert_verify(SSL *s)
2898         {
2899         EVP_PKEY *pkey=NULL;
2900         unsigned char *p;
2901         int al,ok,ret=0;
2902         long n;
2903         int type=0,i,j;
2904         X509 *peer;
2905         const EVP_MD *md = NULL;
2906         EVP_MD_CTX mctx;
2907         EVP_MD_CTX_init(&mctx);
2908
2909         n=s->method->ssl_get_message(s,
2910                 SSL3_ST_SR_CERT_VRFY_A,
2911                 SSL3_ST_SR_CERT_VRFY_B,
2912                 -1,
2913                 514, /* 514? */
2914                 &ok);
2915
2916         if (!ok) return((int)n);
2917
2918         if (s->session->peer != NULL)
2919                 {
2920                 peer=s->session->peer;
2921                 pkey=X509_get_pubkey(peer);
2922                 type=X509_certificate_type(peer,pkey);
2923                 }
2924         else
2925                 {
2926                 peer=NULL;
2927                 pkey=NULL;
2928                 }
2929
2930         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2931                 {
2932                 s->s3->tmp.reuse_message=1;
2933                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2934                         {
2935                         al=SSL_AD_UNEXPECTED_MESSAGE;
2936                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2937                         goto f_err;
2938                         }
2939                 ret=1;
2940                 goto end;
2941                 }
2942
2943         if (peer == NULL)
2944                 {
2945                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2946                 al=SSL_AD_UNEXPECTED_MESSAGE;
2947                 goto f_err;
2948                 }
2949
2950         if (!(type & EVP_PKT_SIGN))
2951                 {
2952                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2953                 al=SSL_AD_ILLEGAL_PARAMETER;
2954                 goto f_err;
2955                 }
2956
2957         if (s->s3->change_cipher_spec)
2958                 {
2959                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2960                 al=SSL_AD_UNEXPECTED_MESSAGE;
2961                 goto f_err;
2962                 }
2963
2964         /* we now have a signature that we need to verify */
2965         p=(unsigned char *)s->init_msg;
2966         /* Check for broken implementations of GOST ciphersuites */
2967         /* If key is GOST and n is exactly 64, it is bare
2968          * signature without length field */
2969         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2970                 pkey->type == NID_id_GostR3410_2001) )
2971                 {
2972                 i=64;
2973                 } 
2974         else 
2975                 {       
2976                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2977                         {
2978                         int sigalg = tls12_get_sigid(pkey);
2979                         /* Should never happen */
2980                         if (sigalg == -1)
2981                                 {
2982                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2983                                 al=SSL_AD_INTERNAL_ERROR;
2984                                 goto f_err;
2985                                 }
2986                         /* Check key type is consistent with signature */
2987                         if (sigalg != (int)p[1])
2988                                 {
2989                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
2990                                 al=SSL_AD_DECODE_ERROR;
2991                                 goto f_err;
2992                                 }
2993                         md = tls12_get_hash(p[0]);
2994                         if (md == NULL)
2995                                 {
2996                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
2997                                 al=SSL_AD_DECODE_ERROR;
2998                                 goto f_err;
2999                                 }
3000 #ifdef SSL_DEBUG
3001 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3002 #endif
3003                         p += 2;
3004                         n -= 2;
3005                         }
3006                 n2s(p,i);
3007                 n-=2;
3008                 if (i > n)
3009                         {
3010                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3011                         al=SSL_AD_DECODE_ERROR;
3012                         goto f_err;
3013                         }
3014         }
3015         j=EVP_PKEY_size(pkey);
3016         if ((i > j) || (n > j) || (n <= 0))
3017                 {
3018                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3019                 al=SSL_AD_DECODE_ERROR;
3020                 goto f_err;
3021                 }
3022
3023         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3024                 {
3025                 long hdatalen = 0;
3026                 void *hdata;
3027                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3028                 if (hdatalen <= 0)
3029                         {
3030                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3031                         al=SSL_AD_INTERNAL_ERROR;
3032                         goto f_err;
3033                         }
3034 #ifdef SSL_DEBUG
3035                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3036                                                         EVP_MD_name(md));
3037 #endif
3038                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3039                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3040                         {
3041                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3042                         al=SSL_AD_INTERNAL_ERROR;
3043                         goto f_err;
3044                         }
3045
3046                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3047                         {
3048                         al=SSL_AD_DECRYPT_ERROR;
3049                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3050                         goto f_err;
3051                         }
3052                 }
3053         else
3054 #ifndef OPENSSL_NO_RSA 
3055         if (pkey->type == EVP_PKEY_RSA)
3056                 {
3057                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3058                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
3059                                                         pkey->pkey.rsa);
3060                 if (i < 0)
3061                         {
3062                         al=SSL_AD_DECRYPT_ERROR;
3063                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3064                         goto f_err;
3065                         }
3066                 if (i == 0)
3067                         {
3068                         al=SSL_AD_DECRYPT_ERROR;
3069                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3070                         goto f_err;
3071                         }
3072                 }
3073         else
3074 #endif
3075 #ifndef OPENSSL_NO_DSA
3076                 if (pkey->type == EVP_PKEY_DSA)
3077                 {
3078                 j=DSA_verify(pkey->save_type,
3079                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3080                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3081                 if (j <= 0)
3082                         {
3083                         /* bad signature */
3084                         al=SSL_AD_DECRYPT_ERROR;
3085                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3086                         goto f_err;
3087                         }
3088                 }
3089         else
3090 #endif
3091 #ifndef OPENSSL_NO_ECDSA
3092                 if (pkey->type == EVP_PKEY_EC)
3093                 {
3094                 j=ECDSA_verify(pkey->save_type,
3095                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3096                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3097                 if (j <= 0)
3098                         {
3099                         /* bad signature */
3100                         al=SSL_AD_DECRYPT_ERROR;
3101                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3102                             SSL_R_BAD_ECDSA_SIGNATURE);
3103                         goto f_err;
3104                         }
3105                 }
3106         else
3107 #endif
3108         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3109                 {   unsigned char signature[64];
3110                         int idx;
3111                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3112                         EVP_PKEY_verify_init(pctx);
3113                         if (i!=64) {
3114                                 fprintf(stderr,"GOST signature length is %d",i);
3115                         }       
3116                         for (idx=0;idx<64;idx++) {
3117                                 signature[63-idx]=p[idx];
3118                         }       
3119                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3120                         EVP_PKEY_CTX_free(pctx);
3121                         if (j<=0) 
3122                                 {
3123                                 al=SSL_AD_DECRYPT_ERROR;
3124                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3125                                         SSL_R_BAD_ECDSA_SIGNATURE);
3126                                 goto f_err;
3127                                 }       
3128                 }
3129         else    
3130                 {
3131                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3132                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3133                 goto f_err;
3134                 }
3135
3136
3137         ret=1;
3138         if (0)
3139                 {
3140 f_err:
3141                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3142                 }
3143 end:
3144         if (s->s3->handshake_buffer)
3145                 {
3146                 BIO_free(s->s3->handshake_buffer);
3147                 s->s3->handshake_buffer = NULL;
3148                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3149                 }
3150         EVP_MD_CTX_cleanup(&mctx);
3151         EVP_PKEY_free(pkey);
3152         return(ret);
3153         }
3154
3155 int ssl3_get_client_certificate(SSL *s)
3156         {
3157         int i,ok,al,ret= -1;
3158         X509 *x=NULL;
3159         unsigned long l,nc,llen,n;
3160         const unsigned char *p,*q;
3161         unsigned char *d;
3162         STACK_OF(X509) *sk=NULL;
3163
3164         n=s->method->ssl_get_message(s,
3165                 SSL3_ST_SR_CERT_A,
3166                 SSL3_ST_SR_CERT_B,
3167                 -1,
3168                 s->max_cert_list,
3169                 &ok);
3170
3171         if (!ok) return((int)n);
3172
3173         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3174                 {
3175                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3176                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3177                         {
3178                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3179                         al=SSL_AD_HANDSHAKE_FAILURE;
3180                         goto f_err;
3181                         }
3182                 /* If tls asked for a client cert, the client must return a 0 list */
3183                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3184                         {
3185                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3186                         al=SSL_AD_UNEXPECTED_MESSAGE;
3187                         goto f_err;
3188                         }
3189                 s->s3->tmp.reuse_message=1;
3190                 return(1);
3191                 }
3192
3193         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3194                 {
3195                 al=SSL_AD_UNEXPECTED_MESSAGE;
3196                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3197                 goto f_err;
3198                 }
3199         p=d=(unsigned char *)s->init_msg;
3200
3201         if ((sk=sk_X509_new_null()) == NULL)
3202                 {
3203                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3204                 goto err;
3205                 }
3206
3207         n2l3(p,llen);
3208         if (llen+3 != n)
3209                 {
3210                 al=SSL_AD_DECODE_ERROR;
3211                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3212                 goto f_err;
3213                 }
3214         for (nc=0; nc<llen; )
3215                 {
3216                 n2l3(p,l);
3217                 if ((l+nc+3) > llen)
3218                         {
3219                         al=SSL_AD_DECODE_ERROR;
3220                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3221                         goto f_err;
3222                         }
3223
3224                 q=p;
3225                 x=d2i_X509(NULL,&p,l);
3226                 if (x == NULL)
3227                         {
3228                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3229                         goto err;
3230                         }
3231                 if (p != (q+l))
3232                         {
3233                         al=SSL_AD_DECODE_ERROR;
3234                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3235                         goto f_err;
3236                         }
3237                 if (!sk_X509_push(sk,x))
3238                         {
3239                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3240                         goto err;
3241                         }
3242                 x=NULL;
3243                 nc+=l+3;
3244                 }
3245
3246         if (sk_X509_num(sk) <= 0)
3247                 {
3248                 /* TLS does not mind 0 certs returned */
3249                 if (s->version == SSL3_VERSION)
3250                         {
3251                         al=SSL_AD_HANDSHAKE_FAILURE;
3252                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3253                         goto f_err;
3254                         }
3255                 /* Fail for TLS only if we required a certificate */
3256                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3257                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3258                         {
3259                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3260                         al=SSL_AD_HANDSHAKE_FAILURE;
3261                         goto f_err;
3262                         }
3263                 /* No client certificate so digest cached records */
3264                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3265                         {
3266                         al=SSL_AD_INTERNAL_ERROR;
3267                         goto f_err;
3268                         }
3269                 }
3270         else
3271                 {
3272                 i=ssl_verify_cert_chain(s,sk);
3273                 if (i <= 0)
3274                         {
3275                         al=ssl_verify_alarm_type(s->verify_result);
3276                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3277                         goto f_err;
3278                         }
3279                 }
3280
3281         if (s->session->peer != NULL) /* This should not be needed */
3282                 X509_free(s->session->peer);
3283         s->session->peer=sk_X509_shift(sk);
3284         s->session->verify_result = s->verify_result;
3285
3286         /* With the current implementation, sess_cert will always be NULL
3287          * when we arrive here. */
3288         if (s->session->sess_cert == NULL)
3289                 {
3290                 s->session->sess_cert = ssl_sess_cert_new();
3291                 if (s->session->sess_cert == NULL)
3292                         {
3293                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3294                         goto err;
3295                         }
3296                 }
3297         if (s->session->sess_cert->cert_chain != NULL)
3298                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3299         s->session->sess_cert->cert_chain=sk;
3300         /* Inconsistency alert: cert_chain does *not* include the
3301          * peer's own certificate, while we do include it in s3_clnt.c */
3302
3303         sk=NULL;
3304
3305         ret=1;
3306         if (0)
3307                 {
3308 f_err:
3309                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3310                 }
3311 err:
3312         if (x != NULL) X509_free(x);
3313         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3314         return(ret);
3315         }
3316
3317 int ssl3_send_server_certificate(SSL *s)
3318         {
3319         unsigned long l;
3320         X509 *x;
3321
3322         if (s->state == SSL3_ST_SW_CERT_A)
3323                 {
3324                 x=ssl_get_server_send_cert(s);
3325                 if (x == NULL)
3326                         {
3327                         /* VRS: allow null cert if auth == KRB5 */
3328                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3329                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3330                                 {
3331                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3332                                 return(0);
3333                                 }
3334                         }
3335
3336                 l=ssl3_output_cert_chain(s,x);
3337                 s->state=SSL3_ST_SW_CERT_B;
3338                 s->init_num=(int)l;
3339                 s->init_off=0;
3340                 }
3341
3342         /* SSL3_ST_SW_CERT_B */
3343         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3344         }
3345
3346 #ifndef OPENSSL_NO_TLSEXT
3347 /* send a new session ticket (not necessarily for a new session) */
3348 int ssl3_send_newsession_ticket(SSL *s)
3349         {
3350         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3351                 {
3352                 unsigned char *p, *senc, *macstart;
3353                 const unsigned char *const_p;
3354                 int len, slen_full, slen;
3355                 SSL_SESSION *sess;
3356                 unsigned int hlen;
3357                 EVP_CIPHER_CTX ctx;
3358                 HMAC_CTX hctx;
3359                 SSL_CTX *tctx = s->initial_ctx;
3360                 unsigned char iv[EVP_MAX_IV_LENGTH];
3361                 unsigned char key_name[16];
3362
3363                 /* get session encoding length */
3364                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3365                 /* Some length values are 16 bits, so forget it if session is
3366                  * too long
3367                  */
3368                 if (slen_full > 0xFF00)
3369                         return -1;
3370                 senc = OPENSSL_malloc(slen_full);
3371                 if (!senc)
3372                         return -1;
3373                 p = senc;
3374                 i2d_SSL_SESSION(s->session, &p);
3375
3376                 /* create a fresh copy (not shared with other threads) to clean up */
3377                 const_p = senc;
3378                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3379                 if (sess == NULL)
3380                         {
3381                         OPENSSL_free(senc);
3382                         return -1;
3383                         }
3384                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3385
3386                 slen = i2d_SSL_SESSION(sess, NULL);
3387                 if (slen > slen_full) /* shouldn't ever happen */
3388                         {
3389                         OPENSSL_free(senc);
3390                         return -1;
3391                         }
3392                 p = senc;
3393                 i2d_SSL_SESSION(sess, &p);
3394                 SSL_SESSION_free(sess);
3395
3396                 /* Grow buffer if need be: the length calculation is as
3397                  * follows 1 (size of message name) + 3 (message length
3398                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3399                  * 16 (key name) + max_iv_len (iv length) +
3400                  * session_length + max_enc_block_size (max encrypted session
3401                  * length) + max_md_size (HMAC).
3402                  */
3403                 if (!BUF_MEM_grow(s->init_buf,
3404                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3405                         EVP_MAX_MD_SIZE + slen))
3406                         return -1;
3407
3408                 p=(unsigned char *)s->init_buf->data;
3409                 /* do the header */
3410                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3411                 /* Skip message length for now */
3412                 p += 3;
3413                 EVP_CIPHER_CTX_init(&ctx);
3414                 HMAC_CTX_init(&hctx);
3415                 /* Initialize HMAC and cipher contexts. If callback present
3416                  * it does all the work otherwise use generated values
3417                  * from parent ctx.
3418                  */
3419                 if (tctx->tlsext_ticket_key_cb)
3420                         {
3421                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3422                                                          &hctx, 1) < 0)
3423                                 {
3424                                 OPENSSL_free(senc);
3425                                 return -1;
3426                                 }
3427                         }
3428                 else
3429                         {
3430                         RAND_pseudo_bytes(iv, 16);
3431                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3432                                         tctx->tlsext_tick_aes_key, iv);
3433                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3434                                         tlsext_tick_md(), NULL);
3435                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3436                         }
3437
3438                 /* Ticket lifetime hint (advisory only):
3439                  * We leave this unspecified for resumed session (for simplicity),
3440                  * and guess that tickets for new sessions will live as long
3441                  * as their sessions. */
3442                 l2n(s->hit ? 0 : s->session->timeout, p);
3443
3444                 /* Skip ticket length for now */
3445                 p += 2;
3446                 /* Output key name */
3447                 macstart = p;
3448                 memcpy(p, key_name, 16);
3449                 p += 16;
3450                 /* output IV */
3451                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3452                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3453                 /* Encrypt session data *