Make it build.
[openssl.git] / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  *
114  * Portions of the attached software ("Contribution") are developed by 
115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
116  *
117  * The Contribution is licensed pursuant to the OpenSSL open source
118  * license provided above.
119  *
120  * ECC cipher suite support in OpenSSL originally written by
121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
122  *
123  */
124 /* ====================================================================
125  * Copyright 2005 Nokia. All rights reserved.
126  *
127  * The portions of the attached software ("Contribution") is developed by
128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
129  * license.
130  *
131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133  * support (see RFC 4279) to OpenSSL.
134  *
135  * No patent licenses or other rights except those expressly stated in
136  * the OpenSSL open source license shall be deemed granted or received
137  * expressly, by implication, estoppel, or otherwise.
138  *
139  * No assurances are provided by Nokia that the Contribution does not
140  * infringe the patent or other intellectual property rights of any third
141  * party or that the license provides you with all the necessary rights
142  * to make use of the Contribution.
143  *
144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
148  * OTHERWISE.
149  */
150
151 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
153
154 #include <stdio.h>
155 #include "ssl_locl.h"
156 #include "kssl_lcl.h"
157 #include <openssl/buffer.h>
158 #include <openssl/rand.h>
159 #include <openssl/objects.h>
160 #include <openssl/evp.h>
161 #include <openssl/hmac.h>
162 #include <openssl/x509.h>
163 #ifndef OPENSSL_NO_DH
164 #include <openssl/dh.h>
165 #endif
166 #include <openssl/bn.h>
167 #ifndef OPENSSL_NO_KRB5
168 #include <openssl/krb5_asn.h>
169 #endif
170 #include <openssl/md5.h>
171
172 static const SSL_METHOD *ssl3_get_server_method(int ver);
173
174 static const SSL_METHOD *ssl3_get_server_method(int ver)
175         {
176         if (ver == SSL3_VERSION)
177                 return(SSLv3_server_method());
178         else
179                 return(NULL);
180         }
181
182 #ifndef OPENSSL_NO_SRP
183 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
184         {
185         int ret = SSL_ERROR_NONE;
186
187         *al = SSL_AD_UNRECOGNIZED_NAME;
188
189         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
190             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
191                 {
192                 if(s->srp_ctx.login == NULL)
193                         {
194                         /* RFC 5054 says SHOULD reject, 
195                            we do so if There is no srp login name */
196                         ret = SSL3_AL_FATAL;
197                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
198                         }
199                 else
200                         {
201                         ret = SSL_srp_server_param_with_username(s,al);
202                         }
203                 }
204         return ret;
205         }
206 #endif
207
208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
209                         ssl3_accept,
210                         ssl_undefined_function,
211                         ssl3_get_server_method)
212
213 int ssl3_accept(SSL *s)
214         {
215         BUF_MEM *buf;
216         unsigned long alg_k,Time=(unsigned long)time(NULL);
217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
218         int ret= -1;
219         int new_state,state,skip=0;
220
221         RAND_add(&Time,sizeof(Time),0);
222         ERR_clear_error();
223         clear_sys_error();
224
225         if (s->info_callback != NULL)
226                 cb=s->info_callback;
227         else if (s->ctx->info_callback != NULL)
228                 cb=s->ctx->info_callback;
229
230         /* init things to blank */
231         s->in_handshake++;
232         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
233
234         if (s->cert == NULL)
235                 {
236                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
237                 return(-1);
238                 }
239
240 #ifndef OPENSSL_NO_HEARTBEATS
241         /* If we're awaiting a HeartbeatResponse, pretend we
242          * already got and don't await it anymore, because
243          * Heartbeats don't make sense during handshakes anyway.
244          */
245         if (s->tlsext_hb_pending)
246                 {
247                 s->tlsext_hb_pending = 0;
248                 s->tlsext_hb_seq++;
249                 }
250 #endif
251
252         for (;;)
253                 {
254                 state=s->state;
255
256                 switch (s->state)
257                         {
258                 case SSL_ST_RENEGOTIATE:
259                         s->renegotiate=1;
260                         /* s->state=SSL_ST_ACCEPT; */
261
262                 case SSL_ST_BEFORE:
263                 case SSL_ST_ACCEPT:
264                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
265                 case SSL_ST_OK|SSL_ST_ACCEPT:
266
267                         s->server=1;
268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
269
270                         if ((s->version>>8) != 3)
271                                 {
272                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
273                                 return -1;
274                                 }
275                         s->type=SSL_ST_ACCEPT;
276
277                         if (s->init_buf == NULL)
278                                 {
279                                 if ((buf=BUF_MEM_new()) == NULL)
280                                         {
281                                         ret= -1;
282                                         goto end;
283                                         }
284                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
285                                         {
286                                         ret= -1;
287                                         goto end;
288                                         }
289                                 s->init_buf=buf;
290                                 }
291
292                         if (!ssl3_setup_buffers(s))
293                                 {
294                                 ret= -1;
295                                 goto end;
296                                 }
297
298                         s->init_num=0;
299                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
300                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
301
302                         if (s->state != SSL_ST_RENEGOTIATE)
303                                 {
304                                 /* Ok, we now need to push on a buffering BIO so that
305                                  * the output is sent in a way that TCP likes :-)
306                                  */
307                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
308                                 
309                                 ssl3_init_finished_mac(s);
310                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
311                                 s->ctx->stats.sess_accept++;
312                                 }
313                         else if (!s->s3->send_connection_binding &&
314                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
315                                 {
316                                 /* Server attempting to renegotiate with
317                                  * client that doesn't support secure
318                                  * renegotiation.
319                                  */
320                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
321                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
322                                 ret = -1;
323                                 goto end;
324                                 }
325                         else
326                                 {
327                                 /* s->state == SSL_ST_RENEGOTIATE,
328                                  * we will just send a HelloRequest */
329                                 s->ctx->stats.sess_accept_renegotiate++;
330                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
331                                 }
332                         break;
333
334                 case SSL3_ST_SW_HELLO_REQ_A:
335                 case SSL3_ST_SW_HELLO_REQ_B:
336
337                         s->shutdown=0;
338                         ret=ssl3_send_hello_request(s);
339                         if (ret <= 0) goto end;
340                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
341                         s->state=SSL3_ST_SW_FLUSH;
342                         s->init_num=0;
343
344                         ssl3_init_finished_mac(s);
345                         break;
346
347                 case SSL3_ST_SW_HELLO_REQ_C:
348                         s->state=SSL_ST_OK;
349                         break;
350
351                 case SSL3_ST_SR_CLNT_HELLO_A:
352                 case SSL3_ST_SR_CLNT_HELLO_B:
353                 case SSL3_ST_SR_CLNT_HELLO_C:
354
355                         if (s->rwstate != SSL_X509_LOOKUP)
356                         {
357                                 ret=ssl3_get_client_hello(s);
358                                 if (ret <= 0) goto end;
359                         }
360 #ifndef OPENSSL_NO_SRP
361                         {
362                         int al;
363                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
364                                         {
365                                         /* callback indicates firther work to be done */
366                                         s->rwstate=SSL_X509_LOOKUP;
367                                         goto end;
368                                         }
369                         if (ret != SSL_ERROR_NONE)
370                                 {
371                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);    
372                                 /* This is not really an error but the only means to
373                                    for a client to detect whether srp is supported. */
374                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)      
375                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);                     
376                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;                       
377                                 ret= -1;
378                                 goto end;       
379                                 }
380                         }
381 #endif          
382                         
383                         s->renegotiate = 2;
384                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
385                         s->init_num=0;
386                         break;
387
388                 case SSL3_ST_SW_SRVR_HELLO_A:
389                 case SSL3_ST_SW_SRVR_HELLO_B:
390                         ret=ssl3_send_server_hello(s);
391                         if (ret <= 0) goto end;
392 #ifndef OPENSSL_NO_TLSEXT
393                         if (s->hit)
394                                 {
395                                 if (s->tlsext_ticket_expected)
396                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
397                                 else
398                                         s->state=SSL3_ST_SW_CHANGE_A;
399                                 }
400 #else
401                         if (s->hit)
402                                         s->state=SSL3_ST_SW_CHANGE_A;
403 #endif
404                         else
405 #ifndef OPENSSL_NO_TLSEXT
406                                 s->state = SSL3_ST_SW_SUPPLEMENTAL_DATA_A;
407 #else
408                         s->state = SSL3_ST_SW_CERT_A;
409 #endif
410                         s->init_num = 0;
411                         break;
412
413 #ifndef OPENSSL_NO_TLSEXT
414                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_A:
415                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_B:
416                         ret = tls1_send_server_supplemental_data(s, &skip);
417                         if (ret <= 0) goto end;
418
419                         s->state = SSL3_ST_SW_CERT_A;
420                         s->init_num = 0;
421                         break;
422 #endif
423
424                 case SSL3_ST_SW_CERT_A:
425                 case SSL3_ST_SW_CERT_B:
426                         /* Check if it is anon DH or anon ECDH, */
427                         /* normal PSK or KRB5 or SRP */
428                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
429                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
430                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
431                                 {
432                                 ret=ssl3_send_server_certificate(s);
433                                 if (ret <= 0) goto end;
434 #ifndef OPENSSL_NO_TLSEXT
435                                 if (s->tlsext_status_expected)
436                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
437                                 else
438                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
439                                 }
440                         else
441                                 {
442                                 skip = 1;
443                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
444                                 }
445 #else
446                                 }
447                         else
448                                 skip=1;
449
450                         s->state=SSL3_ST_SW_KEY_EXCH_A;
451 #endif
452                         s->init_num=0;
453                         break;
454
455                 case SSL3_ST_SW_KEY_EXCH_A:
456                 case SSL3_ST_SW_KEY_EXCH_B:
457                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
458
459                         /* clear this, it may get reset by
460                          * send_server_key_exchange */
461                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
462 #ifndef OPENSSL_NO_KRB5
463                                 && !(alg_k & SSL_kKRB5)
464 #endif /* OPENSSL_NO_KRB5 */
465                                 )
466                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
467                                  * even when forbidden by protocol specs
468                                  * (handshake may fail as clients are not required to
469                                  * be able to handle this) */
470                                 s->s3->tmp.use_rsa_tmp=1;
471                         else
472                                 s->s3->tmp.use_rsa_tmp=0;
473
474
475                         /* only send if a DH key exchange, fortezza or
476                          * RSA but we have a sign only certificate
477                          *
478                          * PSK: may send PSK identity hints
479                          *
480                          * For ECC ciphersuites, we send a serverKeyExchange
481                          * message only if the cipher suite is either
482                          * ECDH-anon or ECDHE. In other cases, the
483                          * server certificate contains the server's
484                          * public key for key exchange.
485                          */
486                         if (s->s3->tmp.use_rsa_tmp
487                         /* PSK: send ServerKeyExchange if PSK identity
488                          * hint if provided */
489 #ifndef OPENSSL_NO_PSK
490                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
491 #endif
492 #ifndef OPENSSL_NO_SRP
493                             /* SRP: send ServerKeyExchange */
494                             || (alg_k & SSL_kSRP)
495 #endif
496                             || (alg_k & SSL_kEDH)
497                             || (alg_k & SSL_kEECDH)
498                             || ((alg_k & SSL_kRSA)
499                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
500                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
501                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
502                                         )
503                                     )
504                                 )
505                             )
506                                 {
507                                 ret=ssl3_send_server_key_exchange(s);
508                                 if (ret <= 0) goto end;
509                                 }
510                         else
511                                 skip=1;
512
513                         s->state=SSL3_ST_SW_CERT_REQ_A;
514                         s->init_num=0;
515                         break;
516
517                 case SSL3_ST_SW_CERT_REQ_A:
518                 case SSL3_ST_SW_CERT_REQ_B:
519                         if (/* don't request cert unless asked for it: */
520                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
521                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
522                                  * don't request cert during re-negotiation: */
523                                 ((s->session->peer != NULL) &&
524                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
525                                 /* never request cert in anonymous ciphersuites
526                                  * (see section "Certificate request" in SSL 3 drafts
527                                  * and in RFC 2246): */
528                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
529                                  /* ... except when the application insists on verification
530                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
531                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
532                                  /* never request cert in Kerberos ciphersuites */
533                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
534                                 /* With normal PSK Certificates and
535                                  * Certificate Requests are omitted */
536                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
537                                 {
538                                 /* no cert request */
539                                 skip=1;
540                                 s->s3->tmp.cert_request=0;
541                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
542                                 if (s->s3->handshake_buffer)
543                                         if (!ssl3_digest_cached_records(s))
544                                                 return -1;
545                                 }
546                         else
547                                 {
548                                 s->s3->tmp.cert_request=1;
549                                 ret=ssl3_send_certificate_request(s);
550                                 if (ret <= 0) goto end;
551 #ifndef NETSCAPE_HANG_BUG
552                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
553 #else
554                                 s->state=SSL3_ST_SW_FLUSH;
555                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
556 #endif
557                                 s->init_num=0;
558                                 }
559                         break;
560
561                 case SSL3_ST_SW_SRVR_DONE_A:
562                 case SSL3_ST_SW_SRVR_DONE_B:
563                         ret=ssl3_send_server_done(s);
564                         if (ret <= 0) goto end;
565                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
566                         s->state=SSL3_ST_SW_FLUSH;
567                         s->init_num=0;
568                         break;
569                 
570                 case SSL3_ST_SW_FLUSH:
571
572                         /* This code originally checked to see if
573                          * any data was pending using BIO_CTRL_INFO
574                          * and then flushed. This caused problems
575                          * as documented in PR#1939. The proposed
576                          * fix doesn't completely resolve this issue
577                          * as buggy implementations of BIO_CTRL_PENDING
578                          * still exist. So instead we just flush
579                          * unconditionally.
580                          */
581
582                         s->rwstate=SSL_WRITING;
583                         if (BIO_flush(s->wbio) <= 0)
584                                 {
585                                 ret= -1;
586                                 goto end;
587                                 }
588                         s->rwstate=SSL_NOTHING;
589
590                         s->state=s->s3->tmp.next_state;
591                         break;
592 #ifndef OPENSSL_NO_TLSEXT
593                 case SSL3_ST_SR_SUPPLEMENTAL_DATA_A:
594                 case SSL3_ST_SR_SUPPLEMENTAL_DATA_B:
595                         ret=tls1_get_client_supplemental_data(s);
596                         if (ret <= 0) goto end;
597                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
598                         s->state=SSL3_ST_SW_FLUSH;
599                         s->init_num=0;
600                         break;
601 #endif
602                 case SSL3_ST_SR_CERT_A:
603                 case SSL3_ST_SR_CERT_B:
604                         /* Check for second client hello (MS SGC) */
605                         ret = ssl3_check_client_hello(s);
606                         if (ret <= 0)
607                                 goto end;
608                         if (ret == 2)
609                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
610 #ifndef OPENSSL_NO_TLSEXT
611                         else if (ret == 3)
612                                 s->state = SSL3_ST_SR_SUPPLEMENTAL_DATA_A;
613 #endif
614                         else {
615                                 if (s->s3->tmp.cert_request)
616                                         {
617                                         ret=ssl3_get_client_certificate(s);
618                                         if (ret <= 0) goto end;
619                                         }
620                                 s->init_num=0;
621                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
622                         }
623                         break;
624
625                 case SSL3_ST_SR_KEY_EXCH_A:
626                 case SSL3_ST_SR_KEY_EXCH_B:
627                         ret=ssl3_get_client_key_exchange(s);
628                         if (ret <= 0)
629                                 goto end;
630                         if (ret == 2)
631                                 {
632                                 /* For the ECDH ciphersuites when
633                                  * the client sends its ECDH pub key in
634                                  * a certificate, the CertificateVerify
635                                  * message is not sent.
636                                  * Also for GOST ciphersuites when
637                                  * the client uses its key from the certificate
638                                  * for key exchange.
639                                  */
640 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
641                                 s->state=SSL3_ST_SR_FINISHED_A;
642 #else
643                                 if (s->s3->next_proto_neg_seen)
644                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
645                                 else
646                                         s->state=SSL3_ST_SR_FINISHED_A;
647 #endif
648                                 s->init_num = 0;
649                                 }
650                         else if (SSL_USE_SIGALGS(s))
651                                 {
652                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
653                                 s->init_num=0;
654                                 if (!s->session->peer)
655                                         break;
656                                 /* For sigalgs freeze the handshake buffer
657                                  * at this point and digest cached records.
658                                  */
659                                 if (!s->s3->handshake_buffer)
660                                         {
661                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
662                                         return -1;
663                                         }
664                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
665                                 if (!ssl3_digest_cached_records(s))
666                                         return -1;
667                                 }
668                         else
669                                 {
670                                 int offset=0;
671                                 int dgst_num;
672
673                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
674                                 s->init_num=0;
675
676                                 /* We need to get hashes here so if there is
677                                  * a client cert, it can be verified
678                                  * FIXME - digest processing for CertificateVerify
679                                  * should be generalized. But it is next step
680                                  */
681                                 if (s->s3->handshake_buffer)
682                                         if (!ssl3_digest_cached_records(s))
683                                                 return -1;
684                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)    
685                                         if (s->s3->handshake_dgst[dgst_num]) 
686                                                 {
687                                                 int dgst_size;
688
689                                                 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]));
690                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
691                                                 if (dgst_size < 0)
692                                                         {
693                                                         ret = -1;
694                                                         goto end;
695                                                         }
696                                                 offset+=dgst_size;
697                                                 }               
698                                 }
699                         break;
700
701                 case SSL3_ST_SR_CERT_VRFY_A:
702                 case SSL3_ST_SR_CERT_VRFY_B:
703
704                         /* we should decide if we expected this one */
705                         ret=ssl3_get_cert_verify(s);
706                         if (ret <= 0) goto end;
707
708 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
709                         s->state=SSL3_ST_SR_FINISHED_A;
710 #else
711                         if (s->s3->next_proto_neg_seen)
712                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
713                         else
714                                 s->state=SSL3_ST_SR_FINISHED_A;
715 #endif
716                         s->init_num=0;
717                         break;
718
719 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
720                 case SSL3_ST_SR_NEXT_PROTO_A:
721                 case SSL3_ST_SR_NEXT_PROTO_B:
722                         ret=ssl3_get_next_proto(s);
723                         if (ret <= 0) goto end;
724                         s->init_num = 0;
725                         s->state=SSL3_ST_SR_FINISHED_A;
726                         break;
727 #endif
728
729                 case SSL3_ST_SR_FINISHED_A:
730                 case SSL3_ST_SR_FINISHED_B:
731                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
732                                 SSL3_ST_SR_FINISHED_B);
733                         if (ret <= 0) goto end;
734                         if (s->hit)
735                                 s->state=SSL_ST_OK;
736 #ifndef OPENSSL_NO_TLSEXT
737                         else if (s->tlsext_ticket_expected)
738                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
739 #endif
740                         else
741                                 s->state=SSL3_ST_SW_CHANGE_A;
742                         s->init_num=0;
743                         break;
744
745 #ifndef OPENSSL_NO_TLSEXT
746                 case SSL3_ST_SW_SESSION_TICKET_A:
747                 case SSL3_ST_SW_SESSION_TICKET_B:
748                         ret=ssl3_send_newsession_ticket(s);
749                         if (ret <= 0) goto end;
750                         s->state=SSL3_ST_SW_CHANGE_A;
751                         s->init_num=0;
752                         break;
753
754                 case SSL3_ST_SW_CERT_STATUS_A:
755                 case SSL3_ST_SW_CERT_STATUS_B:
756                         ret=ssl3_send_cert_status(s);
757                         if (ret <= 0) goto end;
758                         s->state=SSL3_ST_SW_KEY_EXCH_A;
759                         s->init_num=0;
760                         break;
761
762 #endif
763
764                 case SSL3_ST_SW_CHANGE_A:
765                 case SSL3_ST_SW_CHANGE_B:
766
767                         s->session->cipher=s->s3->tmp.new_cipher;
768                         if (!s->method->ssl3_enc->setup_key_block(s))
769                                 { ret= -1; goto end; }
770
771                         ret=ssl3_send_change_cipher_spec(s,
772                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
773
774                         if (ret <= 0) goto end;
775                         s->state=SSL3_ST_SW_FINISHED_A;
776                         s->init_num=0;
777
778                         if (!s->method->ssl3_enc->change_cipher_state(s,
779                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
780                                 {
781                                 ret= -1;
782                                 goto end;
783                                 }
784
785                         break;
786
787                 case SSL3_ST_SW_FINISHED_A:
788                 case SSL3_ST_SW_FINISHED_B:
789                         ret=ssl3_send_finished(s,
790                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
791                                 s->method->ssl3_enc->server_finished_label,
792                                 s->method->ssl3_enc->server_finished_label_len);
793                         if (ret <= 0) goto end;
794                         s->state=SSL3_ST_SW_FLUSH;
795                         if (s->hit)
796                                 {
797 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
798                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
799 #else
800                                 if (s->s3->next_proto_neg_seen)
801                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
802                                 else
803                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
804 #endif
805                                 }
806                         else
807                                 s->s3->tmp.next_state=SSL_ST_OK;
808                         s->init_num=0;
809                         break;
810
811                 case SSL_ST_OK:
812                         /* clean a few things up */
813                         ssl3_cleanup_key_block(s);
814
815                         BUF_MEM_free(s->init_buf);
816                         s->init_buf=NULL;
817
818                         /* remove buffering on output */
819                         ssl_free_wbio_buffer(s);
820
821                         s->init_num=0;
822
823                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
824                                 {
825                                 s->renegotiate=0;
826                                 s->new_session=0;
827                                 
828                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
829                                 
830                                 s->ctx->stats.sess_accept_good++;
831                                 /* s->server=1; */
832                                 s->handshake_func=ssl3_accept;
833
834                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
835                                 }
836                         
837                         ret = 1;
838                         goto end;
839                         /* break; */
840
841                 default:
842                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
843                         ret= -1;
844                         goto end;
845                         /* break; */
846                         }
847                 
848                 if (!s->s3->tmp.reuse_message && !skip)
849                         {
850                         if (s->debug)
851                                 {
852                                 if ((ret=BIO_flush(s->wbio)) <= 0)
853                                         goto end;
854                                 }
855
856
857                         if ((cb != NULL) && (s->state != state))
858                                 {
859                                 new_state=s->state;
860                                 s->state=state;
861                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
862                                 s->state=new_state;
863                                 }
864                         }
865                 skip=0;
866                 }
867 end:
868         /* BIO_flush(s->wbio); */
869
870         s->in_handshake--;
871         if (cb != NULL)
872                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
873         return(ret);
874         }
875
876 int ssl3_send_hello_request(SSL *s)
877         {
878
879         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
880                 {
881                 ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0);
882                 s->state=SSL3_ST_SW_HELLO_REQ_B;
883                 }
884
885         /* SSL3_ST_SW_HELLO_REQ_B */
886         return ssl_do_write(s);
887         }
888
889 int ssl3_check_client_hello(SSL *s)
890         {
891         int ok;
892         long n;
893
894         /* this function is called when we really expect a Certificate message,
895          * so permit appropriate message length */
896         n=s->method->ssl_get_message(s,
897                 SSL3_ST_SR_CERT_A,
898                 SSL3_ST_SR_CERT_B,
899                 -1,
900                 s->max_cert_list,
901                 &ok);
902         if (!ok) return((int)n);
903         s->s3->tmp.reuse_message = 1;
904 #ifndef OPENSSL_NO_TLSEXT
905         if (s->s3->tmp.message_type == SSL3_MT_SUPPLEMENTAL_DATA)
906                 {
907                 return 3;
908                 }
909 #endif
910         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
911                 {
912                 /* We only allow the client to restart the handshake once per
913                  * negotiation. */
914                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
915                         {
916                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
917                         return -1;
918                         }
919                 /* Throw away what we have done so far in the current handshake,
920                  * which will now be aborted. (A full SSL_clear would be too much.) */
921 #ifndef OPENSSL_NO_DH
922                 if (s->s3->tmp.dh != NULL)
923                         {
924                         DH_free(s->s3->tmp.dh);
925                         s->s3->tmp.dh = NULL;
926                         }
927 #endif
928 #ifndef OPENSSL_NO_ECDH
929                 if (s->s3->tmp.ecdh != NULL)
930                         {
931                         EC_KEY_free(s->s3->tmp.ecdh);
932                         s->s3->tmp.ecdh = NULL;
933                         }
934 #endif
935                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
936                 return 2;
937                 }
938         return 1;
939 }
940
941 int ssl3_get_client_hello(SSL *s)
942         {
943         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
944         unsigned int cookie_len;
945         long n;
946         unsigned long id;
947         unsigned char *p,*d;
948         SSL_CIPHER *c;
949 #ifndef OPENSSL_NO_COMP
950         unsigned char *q;
951         SSL_COMP *comp=NULL;
952 #endif
953         STACK_OF(SSL_CIPHER) *ciphers=NULL;
954
955         /* We do this so that we will respond with our native type.
956          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
957          * This down switching should be handled by a different method.
958          * If we are SSLv3, we will respond with SSLv3, even if prompted with
959          * TLSv1.
960          */
961         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
962                 )
963                 {
964                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
965                 }
966         s->first_packet=1;
967         n=s->method->ssl_get_message(s,
968                 SSL3_ST_SR_CLNT_HELLO_B,
969                 SSL3_ST_SR_CLNT_HELLO_C,
970                 SSL3_MT_CLIENT_HELLO,
971                 SSL3_RT_MAX_PLAIN_LENGTH,
972                 &ok);
973
974         if (!ok) return((int)n);
975         s->first_packet=0;
976         d=p=(unsigned char *)s->init_msg;
977
978         /* use version from inside client hello, not from record header
979          * (may differ: see RFC 2246, Appendix E, second paragraph) */
980         s->client_version=(((int)p[0])<<8)|(int)p[1];
981         p+=2;
982
983         if ((SSL_IS_DTLS(s) && s->client_version > s->version
984                         && s->method->version != DTLS_ANY_VERSION) ||
985             (!SSL_IS_DTLS(s) && s->client_version < s->version))
986                 {
987                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
988                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
989                         {
990                         /* similar to ssl3_get_record, send alert using remote version number */
991                         s->version = s->client_version;
992                         }
993                 al = SSL_AD_PROTOCOL_VERSION;
994                 goto f_err;
995                 }
996
997         /* If we require cookies and this ClientHello doesn't
998          * contain one, just return since we do not want to
999          * allocate any memory yet. So check cookie length...
1000          */
1001         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
1002                 {
1003                 unsigned int session_length, cookie_length;
1004                 
1005                 session_length = *(p + SSL3_RANDOM_SIZE);
1006                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
1007
1008                 if (cookie_length == 0)
1009                         return 1;
1010                 }
1011
1012         /* load the client random */
1013         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1014         p+=SSL3_RANDOM_SIZE;
1015
1016         /* get the session-id */
1017         j= *(p++);
1018
1019         s->hit=0;
1020         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1021          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1022          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1023          * than a change to default behavior so that applications relying on this for security
1024          * won't even compile against older library versions).
1025          *
1026          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1027          * renegotiation but not a new session (s->new_session remains unset): for servers,
1028          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1029          * setting will be ignored.
1030          */
1031         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1032                 {
1033                 if (!ssl_get_new_session(s,1))
1034                         goto err;
1035                 }
1036         else
1037                 {
1038                 i=ssl_get_prev_session(s, p, j, d + n);
1039                 if (i == 1)
1040                         { /* previous session */
1041                         s->hit=1;
1042                         }
1043                 else if (i == -1)
1044                         goto err;
1045                 else /* i == 0 */
1046                         {
1047                         if (!ssl_get_new_session(s,1))
1048                                 goto err;
1049                         }
1050                 }
1051
1052         p+=j;
1053
1054         if (SSL_IS_DTLS(s))
1055                 {
1056                 /* cookie stuff */
1057                 cookie_len = *(p++);
1058
1059                 /* 
1060                  * The ClientHello may contain a cookie even if the
1061                  * HelloVerify message has not been sent--make sure that it
1062                  * does not cause an overflow.
1063                  */
1064                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1065                         {
1066                         /* too much data */
1067                         al = SSL_AD_DECODE_ERROR;
1068                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1069                         goto f_err;
1070                         }
1071
1072                 /* verify the cookie if appropriate option is set. */
1073                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1074                         cookie_len > 0)
1075                         {
1076                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1077
1078                         if ( s->ctx->app_verify_cookie_cb != NULL)
1079                                 {
1080                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1081                                         cookie_len) == 0)
1082                                         {
1083                                         al=SSL_AD_HANDSHAKE_FAILURE;
1084                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1085                                                 SSL_R_COOKIE_MISMATCH);
1086                                         goto f_err;
1087                                         }
1088                                 /* else cookie verification succeeded */
1089                                 }
1090                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
1091                                                   s->d1->cookie_len) != 0) /* default verification */
1092                                 {
1093                                         al=SSL_AD_HANDSHAKE_FAILURE;
1094                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
1095                                                 SSL_R_COOKIE_MISMATCH);
1096                                         goto f_err;
1097                                 }
1098                         /* Set to -2 so if successful we return 2 */
1099                         ret = -2;
1100                         }
1101
1102                 p += cookie_len;
1103                 if (s->method->version == DTLS_ANY_VERSION)
1104                         {
1105                         /* Select version to use */
1106                         if (s->client_version <= DTLS1_2_VERSION &&
1107                                 !(s->options & SSL_OP_NO_DTLSv1_2))
1108                                 {
1109                                 s->version = DTLS1_2_VERSION;
1110                                 s->method = DTLSv1_2_server_method();
1111                                 }
1112                         else if (tls1_suiteb(s))
1113                                 {
1114                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1115                                 s->version = s->client_version;
1116                                 al = SSL_AD_PROTOCOL_VERSION;
1117                                 goto f_err;
1118                                 }
1119                         else if (s->client_version <= DTLS1_VERSION &&
1120                                 !(s->options & SSL_OP_NO_DTLSv1))
1121                                 {
1122                                 s->version = DTLS1_VERSION;
1123                                 s->method = DTLSv1_server_method();
1124                                 }
1125                         else
1126                                 {
1127                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
1128                                 s->version = s->client_version;
1129                                 al = SSL_AD_PROTOCOL_VERSION;
1130                                 goto f_err;
1131                                 }
1132                         s->session->ssl_version = s->version;
1133                         }
1134                 }
1135
1136         n2s(p,i);
1137         if ((i == 0) && (j != 0))
1138                 {
1139                 /* we need a cipher if we are not resuming a session */
1140                 al=SSL_AD_ILLEGAL_PARAMETER;
1141                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1142                 goto f_err;
1143                 }
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         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1152                 == NULL))
1153                 {
1154                 goto err;
1155                 }
1156         p+=i;
1157
1158         /* If it is a hit, check that the cipher is in the list */
1159         if ((s->hit) && (i > 0))
1160                 {
1161                 j=0;
1162                 id=s->session->cipher->id;
1163
1164 #ifdef CIPHER_DEBUG
1165                 printf("client sent %d ciphers\n",sk_num(ciphers));
1166 #endif
1167                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1168                         {
1169                         c=sk_SSL_CIPHER_value(ciphers,i);
1170 #ifdef CIPHER_DEBUG
1171                         printf("client [%2d of %2d]:%s\n",
1172                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1173 #endif
1174                         if (c->id == id)
1175                                 {
1176                                 j=1;
1177                                 break;
1178                                 }
1179                         }
1180 /* Disabled because it can be used in a ciphersuite downgrade
1181  * attack: CVE-2010-4180.
1182  */
1183 #if 0
1184                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1185                         {
1186                         /* Special case as client bug workaround: the previously used cipher may
1187                          * not be in the current list, the client instead might be trying to
1188                          * continue using a cipher that before wasn't chosen due to server
1189                          * preferences.  We'll have to reject the connection if the cipher is not
1190                          * enabled, though. */
1191                         c = sk_SSL_CIPHER_value(ciphers, 0);
1192                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1193                                 {
1194                                 s->session->cipher = c;
1195                                 j = 1;
1196                                 }
1197                         }
1198 #endif
1199                 if (j == 0)
1200                         {
1201                         /* we need to have the cipher in the cipher
1202                          * list if we are asked to reuse it */
1203                         al=SSL_AD_ILLEGAL_PARAMETER;
1204                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1205                         goto f_err;
1206                         }
1207                 }
1208
1209         /* compression */
1210         i= *(p++);
1211         if ((p+i) > (d+n))
1212                 {
1213                 /* not enough data */
1214                 al=SSL_AD_DECODE_ERROR;
1215                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1216                 goto f_err;
1217                 }
1218 #ifndef OPENSSL_NO_COMP
1219         q=p;
1220 #endif
1221         for (j=0; j<i; j++)
1222                 {
1223                 if (p[j] == 0) break;
1224                 }
1225
1226         p+=i;
1227         if (j >= i)
1228                 {
1229                 /* no compress */
1230                 al=SSL_AD_DECODE_ERROR;
1231                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1232                 goto f_err;
1233                 }
1234
1235 #ifndef OPENSSL_NO_TLSEXT
1236         /* TLS extensions*/
1237         if (s->version >= SSL3_VERSION)
1238                 {
1239                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1240                         {
1241                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1242                         goto err;
1243                         }
1244                 }
1245
1246         /* Check if we want to use external pre-shared secret for this
1247          * handshake for not reused session only. We need to generate
1248          * server_random before calling tls_session_secret_cb in order to allow
1249          * SessionTicket processing to use it in key derivation. */
1250         {
1251                 unsigned long Time;
1252                 unsigned char *pos;
1253                 Time=(unsigned long)time(NULL);                 /* Time */
1254                 pos=s->s3->server_random;
1255                 l2n(Time,pos);
1256                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1257                         {
1258                         goto f_err;
1259                         }
1260         }
1261
1262         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1263                 {
1264                 SSL_CIPHER *pref_cipher=NULL;
1265
1266                 s->session->master_key_length=sizeof(s->session->master_key);
1267                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1268                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1269                         {
1270                         s->hit=1;
1271                         s->session->ciphers=ciphers;
1272                         s->session->verify_result=X509_V_OK;
1273
1274                         ciphers=NULL;
1275
1276                         /* check if some cipher was preferred by call back */
1277                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1278                         if (pref_cipher == NULL)
1279                                 {
1280                                 al=SSL_AD_HANDSHAKE_FAILURE;
1281                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1282                                 goto f_err;
1283                                 }
1284
1285                         s->session->cipher=pref_cipher;
1286
1287                         if (s->cipher_list)
1288                                 sk_SSL_CIPHER_free(s->cipher_list);
1289
1290                         if (s->cipher_list_by_id)
1291                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1292
1293                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1294                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1295                         }
1296                 }
1297 #endif
1298
1299         /* Worst case, we will use the NULL compression, but if we have other
1300          * options, we will now look for them.  We have i-1 compression
1301          * algorithms from the client, starting at q. */
1302         s->s3->tmp.new_compression=NULL;
1303 #ifndef OPENSSL_NO_COMP
1304         /* This only happens if we have a cache hit */
1305         if (s->session->compress_meth != 0)
1306                 {
1307                 int m, comp_id = s->session->compress_meth;
1308                 /* Perform sanity checks on resumed compression algorithm */
1309                 /* Can't disable compression */
1310                 if (s->options & SSL_OP_NO_COMPRESSION)
1311                         {
1312                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1313                         goto f_err;
1314                         }
1315                 /* Look for resumed compression method */
1316                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1317                         {
1318                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1319                         if (comp_id == comp->id)
1320                                 {
1321                                 s->s3->tmp.new_compression=comp;
1322                                 break;
1323                                 }
1324                         }
1325                 if (s->s3->tmp.new_compression == NULL)
1326                         {
1327                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1328                         goto f_err;
1329                         }
1330                 /* Look for resumed method in compression list */
1331                 for (m = 0; m < i; m++)
1332                         {
1333                         if (q[m] == comp_id)
1334                                 break;
1335                         }
1336                 if (m >= i)
1337                         {
1338                         al=SSL_AD_ILLEGAL_PARAMETER;
1339                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1340                         goto f_err;
1341                         }
1342                 }
1343         else if (s->hit)
1344                 comp = NULL;
1345         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1346                 { /* See if we have a match */
1347                 int m,nn,o,v,done=0;
1348
1349                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1350                 for (m=0; m<nn; m++)
1351                         {
1352                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1353                         v=comp->id;
1354                         for (o=0; o<i; o++)
1355                                 {
1356                                 if (v == q[o])
1357                                         {
1358                                         done=1;
1359                                         break;
1360                                         }
1361                                 }
1362                         if (done) break;
1363                         }
1364                 if (done)
1365                         s->s3->tmp.new_compression=comp;
1366                 else
1367                         comp=NULL;
1368                 }
1369 #else
1370         /* If compression is disabled we'd better not try to resume a session
1371          * using compression.
1372          */
1373         if (s->session->compress_meth != 0)
1374                 {
1375                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1376                 goto f_err;
1377                 }
1378 #endif
1379
1380         /* Given s->session->ciphers and SSL_get_ciphers, we must
1381          * pick a cipher */
1382
1383         if (!s->hit)
1384                 {
1385 #ifdef OPENSSL_NO_COMP
1386                 s->session->compress_meth=0;
1387 #else
1388                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1389 #endif
1390                 if (s->session->ciphers != NULL)
1391                         sk_SSL_CIPHER_free(s->session->ciphers);
1392                 s->session->ciphers=ciphers;
1393                 if (ciphers == NULL)
1394                         {
1395                         al=SSL_AD_ILLEGAL_PARAMETER;
1396                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1397                         goto f_err;
1398                         }
1399                 ciphers=NULL;
1400                 /* Let cert callback update server certificates if required */
1401                 if (s->cert->cert_cb
1402                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
1403                         {
1404                         al=SSL_AD_INTERNAL_ERROR;
1405                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1406                         goto f_err;
1407                         }
1408                 c=ssl3_choose_cipher(s,s->session->ciphers,
1409                                      SSL_get_ciphers(s));
1410
1411                 if (c == NULL)
1412                         {
1413                         al=SSL_AD_HANDSHAKE_FAILURE;
1414                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1415                         goto f_err;
1416                         }
1417                 s->s3->tmp.new_cipher=c;
1418                 /* check whether we should disable session resumption */
1419                 if (s->not_resumable_session_cb != NULL)
1420                         s->session->not_resumable=s->not_resumable_session_cb(s,
1421                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1422                 if (s->session->not_resumable)
1423                         /* do not send a session ticket */
1424                         s->tlsext_ticket_expected = 0;
1425                 }
1426         else
1427                 {
1428                 /* Session-id reuse */
1429 #ifdef REUSE_CIPHER_BUG
1430                 STACK_OF(SSL_CIPHER) *sk;
1431                 SSL_CIPHER *nc=NULL;
1432                 SSL_CIPHER *ec=NULL;
1433
1434                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1435                         {
1436                         sk=s->session->ciphers;
1437                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1438                                 {
1439                                 c=sk_SSL_CIPHER_value(sk,i);
1440                                 if (c->algorithm_enc & SSL_eNULL)
1441                                         nc=c;
1442                                 if (SSL_C_IS_EXPORT(c))
1443                                         ec=c;
1444                                 }
1445                         if (nc != NULL)
1446                                 s->s3->tmp.new_cipher=nc;
1447                         else if (ec != NULL)
1448                                 s->s3->tmp.new_cipher=ec;
1449                         else
1450                                 s->s3->tmp.new_cipher=s->session->cipher;
1451                         }
1452                 else
1453 #endif
1454                 s->s3->tmp.new_cipher=s->session->cipher;
1455                 }
1456
1457         if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER))
1458                 {
1459                 if (!ssl3_digest_cached_records(s))
1460                         goto f_err;
1461                 }
1462         
1463         /* we now have the following setup. 
1464          * client_random
1465          * cipher_list          - our prefered list of ciphers
1466          * ciphers              - the clients prefered list of ciphers
1467          * compression          - basically ignored right now
1468          * ssl version is set   - sslv3
1469          * s->session           - The ssl session has been setup.
1470          * s->hit               - session reuse flag
1471          * s->tmp.new_cipher    - the new cipher to use.
1472          */
1473
1474         /* Handles TLS extensions that we couldn't check earlier */
1475         if (s->version >= SSL3_VERSION)
1476                 {
1477                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1478                         {
1479                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1480                         goto err;
1481                         }
1482                 }
1483
1484         if (ret < 0) ret=-ret;
1485         if (0)
1486                 {
1487 f_err:
1488                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1489                 }
1490 err:
1491         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1492         return ret < 0 ? -1 : ret;
1493         }
1494
1495 int ssl3_send_server_hello(SSL *s)
1496         {
1497         unsigned char *buf;
1498         unsigned char *p,*d;
1499         int i,sl;
1500         unsigned long l;
1501 #ifdef OPENSSL_NO_TLSEXT
1502         unsigned long Time;
1503 #endif
1504
1505         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1506                 {
1507                 buf=(unsigned char *)s->init_buf->data;
1508 #ifdef OPENSSL_NO_TLSEXT
1509                 p=s->s3->server_random;
1510                 /* Generate server_random if it was not needed previously */
1511                 Time=(unsigned long)time(NULL);                 /* Time */
1512                 l2n(Time,p);
1513                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1514                         return -1;
1515 #endif
1516                 /* Do the message type and length last */
1517                 d=p= ssl_handshake_start(s);
1518
1519                 *(p++)=s->version>>8;
1520                 *(p++)=s->version&0xff;
1521
1522                 /* Random stuff */
1523                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1524                 p+=SSL3_RANDOM_SIZE;
1525
1526                 /* There are several cases for the session ID to send
1527                  * back in the server hello:
1528                  * - For session reuse from the session cache,
1529                  *   we send back the old session ID.
1530                  * - If stateless session reuse (using a session ticket)
1531                  *   is successful, we send back the client's "session ID"
1532                  *   (which doesn't actually identify the session).
1533                  * - If it is a new session, we send back the new
1534                  *   session ID.
1535                  * - However, if we want the new session to be single-use,
1536                  *   we send back a 0-length session ID.
1537                  * s->hit is non-zero in either case of session reuse,
1538                  * so the following won't overwrite an ID that we're supposed
1539                  * to send back.
1540                  */
1541                 if (s->session->not_resumable ||
1542                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1543                                 && !s->hit))
1544                         s->session->session_id_length=0;
1545
1546                 sl=s->session->session_id_length;
1547                 if (sl > (int)sizeof(s->session->session_id))
1548                         {
1549                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1550                         return -1;
1551                         }
1552                 *(p++)=sl;
1553                 memcpy(p,s->session->session_id,sl);
1554                 p+=sl;
1555
1556                 /* put the cipher */
1557                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1558                 p+=i;
1559
1560                 /* put the compression method */
1561 #ifdef OPENSSL_NO_COMP
1562                         *(p++)=0;
1563 #else
1564                 if (s->s3->tmp.new_compression == NULL)
1565                         *(p++)=0;
1566                 else
1567                         *(p++)=s->s3->tmp.new_compression->id;
1568 #endif
1569 #ifndef OPENSSL_NO_TLSEXT
1570                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1571                         {
1572                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1573                         return -1;
1574                         }
1575                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1576                         {
1577                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1578                         return -1;
1579                         }
1580 #endif
1581                 /* do the header */
1582                 l=(p-d);
1583                 ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l);
1584                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1585                 }
1586
1587         /* SSL3_ST_SW_SRVR_HELLO_B */
1588         return ssl_do_write(s);
1589         }
1590
1591 int ssl3_send_server_done(SSL *s)
1592         {
1593
1594         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1595                 {
1596                 ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0);
1597                 s->state = SSL3_ST_SW_SRVR_DONE_B;
1598                 }
1599
1600         /* SSL3_ST_SW_SRVR_DONE_B */
1601         return ssl_do_write(s);
1602         }
1603
1604 int ssl3_send_server_key_exchange(SSL *s)
1605         {
1606 #ifndef OPENSSL_NO_RSA
1607         unsigned char *q;
1608         int j,num;
1609         RSA *rsa;
1610         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1611         unsigned int u;
1612 #endif
1613 #ifndef OPENSSL_NO_DH
1614         DH *dh=NULL,*dhp;
1615 #endif
1616 #ifndef OPENSSL_NO_ECDH
1617         EC_KEY *ecdh=NULL, *ecdhp;
1618         unsigned char *encodedPoint = NULL;
1619         int encodedlen = 0;
1620         int curve_id = 0;
1621         BN_CTX *bn_ctx = NULL; 
1622 #endif
1623         EVP_PKEY *pkey;
1624         const EVP_MD *md = NULL;
1625         unsigned char *p,*d;
1626         int al,i;
1627         unsigned long type;
1628         int n;
1629         CERT *cert;
1630         BIGNUM *r[4];
1631         int nr[4],kn;
1632         BUF_MEM *buf;
1633         EVP_MD_CTX md_ctx;
1634
1635         EVP_MD_CTX_init(&md_ctx);
1636         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1637                 {
1638                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1639                 cert=s->cert;
1640
1641                 buf=s->init_buf;
1642
1643                 r[0]=r[1]=r[2]=r[3]=NULL;
1644                 n=0;
1645 #ifndef OPENSSL_NO_RSA
1646                 if (type & SSL_kRSA)
1647                         {
1648                         rsa=cert->rsa_tmp;
1649                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1650                                 {
1651                                 rsa=s->cert->rsa_tmp_cb(s,
1652                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1653                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1654                                 if(rsa == NULL)
1655                                 {
1656                                         al=SSL_AD_HANDSHAKE_FAILURE;
1657                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1658                                         goto f_err;
1659                                 }
1660                                 RSA_up_ref(rsa);
1661                                 cert->rsa_tmp=rsa;
1662                                 }
1663                         if (rsa == NULL)
1664                                 {
1665                                 al=SSL_AD_HANDSHAKE_FAILURE;
1666                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1667                                 goto f_err;
1668                                 }
1669                         r[0]=rsa->n;
1670                         r[1]=rsa->e;
1671                         s->s3->tmp.use_rsa_tmp=1;
1672                         }
1673                 else
1674 #endif
1675 #ifndef OPENSSL_NO_DH
1676                         if (type & SSL_kEDH)
1677                         {
1678                         dhp=cert->dh_tmp;
1679                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1680                                 dhp=s->cert->dh_tmp_cb(s,
1681                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1682                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1683                         if (dhp == NULL)
1684                                 {
1685                                 al=SSL_AD_HANDSHAKE_FAILURE;
1686                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1687                                 goto f_err;
1688                                 }
1689
1690                         if (s->s3->tmp.dh != NULL)
1691                                 {
1692                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1693                                 goto err;
1694                                 }
1695
1696                         if ((dh=DHparams_dup(dhp)) == NULL)
1697                                 {
1698                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1699                                 goto err;
1700                                 }
1701
1702                         s->s3->tmp.dh=dh;
1703                         if ((dhp->pub_key == NULL ||
1704                              dhp->priv_key == NULL ||
1705                              (s->options & SSL_OP_SINGLE_DH_USE)))
1706                                 {
1707                                 if(!DH_generate_key(dh))
1708                                     {
1709                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1710                                            ERR_R_DH_LIB);
1711                                     goto err;
1712                                     }
1713                                 }
1714                         else
1715                                 {
1716                                 dh->pub_key=BN_dup(dhp->pub_key);
1717                                 dh->priv_key=BN_dup(dhp->priv_key);
1718                                 if ((dh->pub_key == NULL) ||
1719                                         (dh->priv_key == NULL))
1720                                         {
1721                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1722                                         goto err;
1723                                         }
1724                                 }
1725                         r[0]=dh->p;
1726                         r[1]=dh->g;
1727                         r[2]=dh->pub_key;
1728                         }
1729                 else 
1730 #endif
1731 #ifndef OPENSSL_NO_ECDH
1732                         if (type & SSL_kEECDH)
1733                         {
1734                         const EC_GROUP *group;
1735
1736                         ecdhp=cert->ecdh_tmp;
1737                         if (s->cert->ecdh_tmp_auto)
1738                                 {
1739                                 /* Get NID of appropriate shared curve */
1740                                 int nid = tls1_shared_curve(s, -2);
1741                                 if (nid != NID_undef)
1742                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1743                                 }
1744                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1745                                 {
1746                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1747                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1748                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1749                                 }
1750                         if (ecdhp == NULL)
1751                                 {
1752                                 al=SSL_AD_HANDSHAKE_FAILURE;
1753                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1754                                 goto f_err;
1755                                 }
1756
1757                         if (s->s3->tmp.ecdh != NULL)
1758                                 {
1759                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1760                                 goto err;
1761                                 }
1762
1763                         /* Duplicate the ECDH structure. */
1764                         if (ecdhp == NULL)
1765                                 {
1766                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1767                                 goto err;
1768                                 }
1769                         if (s->cert->ecdh_tmp_auto)
1770                                 ecdh = ecdhp;
1771                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1772                                 {
1773                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1774                                 goto err;
1775                                 }
1776
1777                         s->s3->tmp.ecdh=ecdh;
1778                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1779                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1780                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1781                                 {
1782                                 if(!EC_KEY_generate_key(ecdh))
1783                                     {
1784                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1785                                     goto err;
1786                                     }
1787                                 }
1788
1789                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1790                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1791                             (EC_KEY_get0_private_key(ecdh) == NULL))
1792                                 {
1793                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1794                                 goto err;
1795                                 }
1796
1797                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1798                             (EC_GROUP_get_degree(group) > 163)) 
1799                                 {
1800                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1801                                 goto err;
1802                                 }
1803
1804                         /* XXX: For now, we only support ephemeral ECDH
1805                          * keys over named (not generic) curves. For 
1806                          * supported named curves, curve_id is non-zero.
1807                          */
1808                         if ((curve_id = 
1809                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1810                             == 0)
1811                                 {
1812                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1813                                 goto err;
1814                                 }
1815
1816                         /* Encode the public key.
1817                          * First check the size of encoding and
1818                          * allocate memory accordingly.
1819                          */
1820                         encodedlen = EC_POINT_point2oct(group, 
1821                             EC_KEY_get0_public_key(ecdh),
1822                             POINT_CONVERSION_UNCOMPRESSED, 
1823                             NULL, 0, NULL);
1824
1825                         encodedPoint = (unsigned char *) 
1826                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1827                         bn_ctx = BN_CTX_new();
1828                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1829                                 {
1830                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1831                                 goto err;
1832                                 }
1833
1834
1835                         encodedlen = EC_POINT_point2oct(group, 
1836                             EC_KEY_get0_public_key(ecdh), 
1837                             POINT_CONVERSION_UNCOMPRESSED, 
1838                             encodedPoint, encodedlen, bn_ctx);
1839
1840                         if (encodedlen == 0) 
1841                                 {
1842                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1843                                 goto err;
1844                                 }
1845
1846                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1847
1848                         /* XXX: For now, we only support named (not 
1849                          * generic) curves in ECDH ephemeral key exchanges.
1850                          * In this situation, we need four additional bytes
1851                          * to encode the entire ServerECDHParams
1852                          * structure. 
1853                          */
1854                         n = 4 + encodedlen;
1855
1856                         /* We'll generate the serverKeyExchange message
1857                          * explicitly so we can set these to NULLs
1858                          */
1859                         r[0]=NULL;
1860                         r[1]=NULL;
1861                         r[2]=NULL;
1862                         r[3]=NULL;
1863                         }
1864                 else 
1865 #endif /* !OPENSSL_NO_ECDH */
1866 #ifndef OPENSSL_NO_PSK
1867                         if (type & SSL_kPSK)
1868                                 {
1869                                 /* reserve size for record length and PSK identity hint*/
1870                                 n+=2+strlen(s->ctx->psk_identity_hint);
1871                                 }
1872                         else
1873 #endif /* !OPENSSL_NO_PSK */
1874 #ifndef OPENSSL_NO_SRP
1875                 if (type & SSL_kSRP)
1876                         {
1877                         if ((s->srp_ctx.N == NULL) ||
1878                                 (s->srp_ctx.g == NULL) ||
1879                                 (s->srp_ctx.s == NULL) ||
1880                                 (s->srp_ctx.B == NULL))
1881                                 {
1882                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1883                                 goto err;
1884                                 }
1885                         r[0]=s->srp_ctx.N;
1886                         r[1]=s->srp_ctx.g;
1887                         r[2]=s->srp_ctx.s;
1888                         r[3]=s->srp_ctx.B;
1889                         }
1890                 else 
1891 #endif
1892                         {
1893                         al=SSL_AD_HANDSHAKE_FAILURE;
1894                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1895                         goto f_err;
1896                         }
1897                 for (i=0; r[i] != NULL && i<4; i++)
1898                         {
1899                         nr[i]=BN_num_bytes(r[i]);
1900 #ifndef OPENSSL_NO_SRP
1901                         if ((i == 2) && (type & SSL_kSRP))
1902                                 n+=1+nr[i];
1903                         else
1904 #endif
1905                         n+=2+nr[i];
1906                         }
1907
1908                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1909                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1910                         {
1911                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1912                                 == NULL)
1913                                 {
1914                                 al=SSL_AD_DECODE_ERROR;
1915                                 goto f_err;
1916                                 }
1917                         kn=EVP_PKEY_size(pkey);
1918                         }
1919                 else
1920                         {
1921                         pkey=NULL;
1922                         kn=0;
1923                         }
1924
1925                 if (!BUF_MEM_grow_clean(buf,n+SSL_HM_HEADER_LENGTH(s)+kn))
1926                         {
1927                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1928                         goto err;
1929                         }
1930                 d = p = ssl_handshake_start(s);
1931
1932                 for (i=0; r[i] != NULL && i<4; i++)
1933                         {
1934 #ifndef OPENSSL_NO_SRP
1935                         if ((i == 2) && (type & SSL_kSRP))
1936                                 {
1937                                 *p = nr[i];
1938                                 p++;
1939                                 }
1940                         else
1941 #endif
1942                         s2n(nr[i],p);
1943                         BN_bn2bin(r[i],p);
1944                         p+=nr[i];
1945                         }
1946
1947 #ifndef OPENSSL_NO_ECDH
1948                 if (type & SSL_kEECDH) 
1949                         {
1950                         /* XXX: For now, we only support named (not generic) curves.
1951                          * In this situation, the serverKeyExchange message has:
1952                          * [1 byte CurveType], [2 byte CurveName]
1953                          * [1 byte length of encoded point], followed by
1954                          * the actual encoded point itself
1955                          */
1956                         *p = NAMED_CURVE_TYPE;
1957                         p += 1;
1958                         *p = 0;
1959                         p += 1;
1960                         *p = curve_id;
1961                         p += 1;
1962                         *p = encodedlen;
1963                         p += 1;
1964                         memcpy((unsigned char*)p, 
1965                             (unsigned char *)encodedPoint, 
1966                             encodedlen);
1967                         OPENSSL_free(encodedPoint);
1968                         encodedPoint = NULL;
1969                         p += encodedlen;
1970                         }
1971 #endif
1972
1973 #ifndef OPENSSL_NO_PSK
1974                 if (type & SSL_kPSK)
1975                         {
1976                         /* copy PSK identity hint */
1977                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1978                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1979                         p+=strlen(s->ctx->psk_identity_hint);
1980                         }
1981 #endif
1982
1983                 /* not anonymous */
1984                 if (pkey != NULL)
1985                         {
1986                         /* n is the length of the params, they start at &(d[4])
1987                          * and p points to the space at the end. */
1988 #ifndef OPENSSL_NO_RSA
1989                         if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1990                                 {
1991                                 q=md_buf;
1992                                 j=0;
1993                                 for (num=2; num > 0; num--)
1994                                         {
1995                                         EVP_MD_CTX_set_flags(&md_ctx,
1996                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1997                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1998                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1999                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2000                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2001                                         EVP_DigestUpdate(&md_ctx,d,n);
2002                                         EVP_DigestFinal_ex(&md_ctx,q,
2003                                                 (unsigned int *)&i);
2004                                         q+=i;
2005                                         j+=i;
2006                                         }
2007                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
2008                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
2009                                         {
2010                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
2011                                         goto err;
2012                                         }
2013                                 s2n(u,p);
2014                                 n+=u+2;
2015                                 }
2016                         else
2017 #endif
2018                         if (md)
2019                                 {
2020                                 /* send signature algorithm */
2021                                 if (SSL_USE_SIGALGS(s))
2022                                         {
2023                                         if (!tls12_get_sigandhash(p, pkey, md))
2024                                                 {
2025                                                 /* Should never happen */
2026                                                 al=SSL_AD_INTERNAL_ERROR;
2027                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2028                                                 goto f_err;
2029                                                 }
2030                                         p+=2;
2031                                         }
2032 #ifdef SSL_DEBUG
2033                                 fprintf(stderr, "Using hash %s\n",
2034                                                         EVP_MD_name(md));
2035 #endif
2036                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2037                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2038                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2039                                 EVP_SignUpdate(&md_ctx,d,n);
2040                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2041                                         (unsigned int *)&i,pkey))
2042                                         {
2043                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2044                                         goto err;
2045                                         }
2046                                 s2n(i,p);
2047                                 n+=i+2;
2048                                 if (SSL_USE_SIGALGS(s))
2049                                         n+= 2;
2050                                 }
2051                         else
2052                                 {
2053                                 /* Is this error check actually needed? */
2054                                 al=SSL_AD_HANDSHAKE_FAILURE;
2055                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2056                                 goto f_err;
2057                                 }
2058                         }
2059
2060                 ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n);
2061                 }
2062
2063         s->state = SSL3_ST_SW_KEY_EXCH_B;
2064         EVP_MD_CTX_cleanup(&md_ctx);
2065         return ssl_do_write(s);
2066 f_err:
2067         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2068 err:
2069 #ifndef OPENSSL_NO_ECDH
2070         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2071         BN_CTX_free(bn_ctx);
2072 #endif
2073         EVP_MD_CTX_cleanup(&md_ctx);
2074         return(-1);
2075         }
2076
2077 int ssl3_send_certificate_request(SSL *s)
2078         {
2079         unsigned char *p,*d;
2080         int i,j,nl,off,n;
2081         STACK_OF(X509_NAME) *sk=NULL;
2082         X509_NAME *name;
2083         BUF_MEM *buf;
2084
2085         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2086                 {
2087                 buf=s->init_buf;
2088
2089                 d=p=ssl_handshake_start(s);
2090
2091                 /* get the list of acceptable cert types */
2092                 p++;
2093                 n=ssl3_get_req_cert_type(s,p);
2094                 d[0]=n;
2095                 p+=n;
2096                 n++;
2097
2098                 if (SSL_USE_SIGALGS(s))
2099                         {
2100                         const unsigned char *psigs;
2101                         nl = tls12_get_psigalgs(s, &psigs);
2102                         s2n(nl, p);
2103                         memcpy(p, psigs, nl);
2104                         p += nl;
2105                         n += nl + 2;
2106                         }
2107
2108                 off=n;
2109                 p+=2;
2110                 n+=2;
2111
2112                 sk=SSL_get_client_CA_list(s);
2113                 nl=0;
2114                 if (sk != NULL)
2115                         {
2116                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2117                                 {
2118                                 name=sk_X509_NAME_value(sk,i);
2119                                 j=i2d_X509_NAME(name,NULL);
2120                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2121                                         {
2122                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2123                                         goto err;
2124                                         }
2125                                 p=(unsigned char *)&(buf->data[4+n]);
2126                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2127                                         {
2128                                         s2n(j,p);
2129                                         i2d_X509_NAME(name,&p);
2130                                         n+=2+j;
2131                                         nl+=2+j;
2132                                         }
2133                                 else
2134                                         {
2135                                         d=p;
2136                                         i2d_X509_NAME(name,&p);
2137                                         j-=2; s2n(j,d); j+=2;
2138                                         n+=j;
2139                                         nl+=j;
2140                                         }
2141                                 }
2142                         }
2143                 /* else no CA names */
2144                 p = ssl_handshake_start(s) + off;
2145                 s2n(nl,p);
2146
2147                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n);
2148
2149 #ifdef NETSCAPE_HANG_BUG
2150                 if (!SSL_IS_DTLS(s))
2151                         {
2152                         p=(unsigned char *)s->init_buf->data + s->init_num;
2153                         /* do the header */
2154                         *(p++)=SSL3_MT_SERVER_DONE;
2155                         *(p++)=0;
2156                         *(p++)=0;
2157                         *(p++)=0;
2158                         s->init_num += 4;
2159                         }
2160 #endif
2161
2162                 s->state = SSL3_ST_SW_CERT_REQ_B;
2163                 }
2164
2165         /* SSL3_ST_SW_CERT_REQ_B */
2166         return ssl_do_write(s);
2167 err:
2168         return(-1);
2169         }
2170
2171 int ssl3_get_client_key_exchange(SSL *s)
2172         {
2173         int i,al,ok;
2174         long n;
2175         unsigned long alg_k;
2176         unsigned char *p;
2177 #ifndef OPENSSL_NO_RSA
2178         RSA *rsa=NULL;
2179         EVP_PKEY *pkey=NULL;
2180 #endif
2181 #ifndef OPENSSL_NO_DH
2182         BIGNUM *pub=NULL;
2183         DH *dh_srvr, *dh_clnt = NULL;
2184 #endif
2185 #ifndef OPENSSL_NO_KRB5
2186         KSSL_ERR kssl_err;
2187 #endif /* OPENSSL_NO_KRB5 */
2188
2189 #ifndef OPENSSL_NO_ECDH
2190         EC_KEY *srvr_ecdh = NULL;
2191         EVP_PKEY *clnt_pub_pkey = NULL;
2192         EC_POINT *clnt_ecpoint = NULL;
2193         BN_CTX *bn_ctx = NULL; 
2194 #endif
2195
2196         n=s->method->ssl_get_message(s,
2197                 SSL3_ST_SR_KEY_EXCH_A,
2198                 SSL3_ST_SR_KEY_EXCH_B,
2199                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2200                 2048, /* ??? */
2201                 &ok);
2202
2203         if (!ok) return((int)n);
2204         p=(unsigned char *)s->init_msg;
2205
2206         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2207
2208 #ifndef OPENSSL_NO_RSA
2209         if (alg_k & SSL_kRSA)
2210                 {
2211                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2212                 int decrypt_len, decrypt_good_mask;
2213                 unsigned char version_good;
2214
2215                 /* FIX THIS UP EAY EAY EAY EAY */
2216                 if (s->s3->tmp.use_rsa_tmp)
2217                         {
2218                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2219                                 rsa=s->cert->rsa_tmp;
2220                         /* Don't do a callback because rsa_tmp should
2221                          * be sent already */
2222                         if (rsa == NULL)
2223                                 {
2224                                 al=SSL_AD_HANDSHAKE_FAILURE;
2225                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2226                                 goto f_err;
2227
2228                                 }
2229                         }
2230                 else
2231                         {
2232                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2233                         if (    (pkey == NULL) ||
2234                                 (pkey->type != EVP_PKEY_RSA) ||
2235                                 (pkey->pkey.rsa == NULL))
2236                                 {
2237                                 al=SSL_AD_HANDSHAKE_FAILURE;
2238                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2239                                 goto f_err;
2240                                 }
2241                         rsa=pkey->pkey.rsa;
2242                         }
2243
2244                 /* TLS and [incidentally] DTLS{0xFEFF} */
2245                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2246                         {
2247                         n2s(p,i);
2248                         if (n != i+2)
2249                                 {
2250                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2251                                         {
2252                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2253                                         goto err;
2254                                         }
2255                                 else
2256                                         p-=2;
2257                                 }
2258                         else
2259                                 n=i;
2260                         }
2261
2262                 /* We must not leak whether a decryption failure occurs because
2263                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2264                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2265                  * the TLS RFC and generates a random premaster secret for the
2266                  * case that the decrypt fails. See
2267                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2268
2269                 /* should be RAND_bytes, but we cannot work around a failure. */
2270                 if (RAND_pseudo_bytes(rand_premaster_secret,
2271                                       sizeof(rand_premaster_secret)) <= 0)
2272                         goto err;
2273                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2274                 ERR_clear_error();
2275
2276                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2277                  * decrypt_good_mask will be zero if so and non-zero otherwise. */
2278                 decrypt_good_mask = decrypt_len ^ SSL_MAX_MASTER_KEY_LENGTH;
2279
2280                 /* If the version in the decrypted pre-master secret is correct
2281                  * then version_good will be zero. The Klima-Pokorny-Rosa
2282                  * extension of Bleichenbacher's attack
2283                  * (http://eprint.iacr.org/2003/052/) exploits the version
2284                  * number check as a "bad version oracle". Thus version checks
2285                  * are done in constant time and are treated like any other
2286                  * decryption error. */
2287                 version_good = p[0] ^ (s->client_version>>8);
2288                 version_good |= p[1] ^ (s->client_version&0xff);
2289
2290                 /* The premaster secret must contain the same version number as
2291                  * the ClientHello to detect version rollback attacks
2292                  * (strangely, the protocol does not offer such protection for
2293                  * DH ciphersuites). However, buggy clients exist that send the
2294                  * negotiated protocol version instead if the server does not
2295                  * support the requested protocol version. If
2296                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2297                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2298                         {
2299                         unsigned char workaround_mask = version_good;
2300                         unsigned char workaround;
2301
2302                         /* workaround_mask will be 0xff if version_good is
2303                          * non-zero (i.e. the version match failed). Otherwise
2304                          * it'll be 0x00. */
2305                         workaround_mask |= workaround_mask >> 4;
2306                         workaround_mask |= workaround_mask >> 2;
2307                         workaround_mask |= workaround_mask >> 1;
2308                         workaround_mask = ~((workaround_mask & 1) - 1);
2309
2310                         workaround = p[0] ^ (s->version>>8);
2311                         workaround |= p[1] ^ (s->version&0xff);
2312
2313                         /* If workaround_mask is 0xff (i.e. there was a version
2314                          * mismatch) then we copy the value of workaround over
2315                          * version_good. */
2316                         version_good = (workaround & workaround_mask) |
2317                                        (version_good & ~workaround_mask);
2318                         }
2319
2320                 /* If any bits in version_good are set then they'll poision
2321                  * decrypt_good_mask and cause rand_premaster_secret to be
2322                  * used. */
2323                 decrypt_good_mask |= version_good;
2324
2325                 /* decrypt_good_mask will be zero iff decrypt_len ==
2326                  * SSL_MAX_MASTER_KEY_LENGTH and the version check passed. We
2327                  * fold the bottom 32 bits of it with an OR so that the LSB
2328                  * will be zero iff everything is good. This assumes that we'll
2329                  * never decrypt a value > 2**31 bytes, which seems safe. */
2330                 decrypt_good_mask |= decrypt_good_mask >> 16;
2331                 decrypt_good_mask |= decrypt_good_mask >> 8;
2332                 decrypt_good_mask |= decrypt_good_mask >> 4;
2333                 decrypt_good_mask |= decrypt_good_mask >> 2;
2334                 decrypt_good_mask |= decrypt_good_mask >> 1;
2335                 /* Now select only the LSB and subtract one. If decrypt_len ==
2336                  * SSL_MAX_MASTER_KEY_LENGTH and the version check passed then
2337                  * decrypt_good_mask will be all ones. Otherwise it'll be all
2338                  * zeros. */
2339                 decrypt_good_mask &= 1;
2340                 decrypt_good_mask--;
2341
2342                 /* Now copy rand_premaster_secret over p using
2343                  * decrypt_good_mask. */
2344                 for (i = 0; i < (int) sizeof(rand_premaster_secret); i++)
2345                         {
2346                         p[i] = (p[i] & decrypt_good_mask) |
2347                                (rand_premaster_secret[i] & ~decrypt_good_mask);
2348                         }
2349
2350                 s->session->master_key_length=
2351                         s->method->ssl3_enc->generate_master_secret(s,
2352                                 s->session->master_key,
2353                                 p,i);
2354                 OPENSSL_cleanse(p,i);
2355                 }
2356         else
2357 #endif
2358 #ifndef OPENSSL_NO_DH
2359                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2360                 {
2361                 int idx = -1;
2362                 EVP_PKEY *skey = NULL;
2363                 if (n)
2364                         n2s(p,i);
2365                 else
2366                         i = 0;
2367                 if (n && n != i+2)
2368                         {
2369                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2370                                 {
2371                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2372                                 goto err;
2373                                 }
2374                         else
2375                                 {
2376                                 p-=2;
2377                                 i=(int)n;
2378                                 }
2379                         }
2380                 if (alg_k & SSL_kDHr)
2381                         idx = SSL_PKEY_DH_RSA;
2382                 else if (alg_k & SSL_kDHd)
2383                         idx = SSL_PKEY_DH_DSA;
2384                 if (idx >= 0)
2385                         {
2386                         skey = s->cert->pkeys[idx].privatekey;
2387                         if ((skey == NULL) ||
2388                                 (skey->type != EVP_PKEY_DH) ||
2389                                 (skey->pkey.dh == NULL))
2390                                 {
2391                                 al=SSL_AD_HANDSHAKE_FAILURE;
2392                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2393                                 goto f_err;
2394                                 }
2395                         dh_srvr = skey->pkey.dh;
2396                         }
2397                 else if (s->s3->tmp.dh == NULL)
2398                         {
2399                         al=SSL_AD_HANDSHAKE_FAILURE;
2400                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2401                         goto f_err;
2402                         }
2403                 else
2404                         dh_srvr=s->s3->tmp.dh;
2405
2406                 if (n == 0L)
2407                         {
2408                         /* Get pubkey from cert */
2409                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2410                         if (clkey)
2411                                 {
2412                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2413                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2414                                 }
2415                         if (dh_clnt == NULL)
2416                                 {
2417                                 al=SSL_AD_HANDSHAKE_FAILURE;
2418                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2419                                 goto f_err;
2420                                 }
2421                         EVP_PKEY_free(clkey);
2422                         pub = dh_clnt->pub_key;
2423                         }
2424                 else
2425                         pub=BN_bin2bn(p,i,NULL);
2426                 if (pub == NULL)
2427                         {
2428                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2429                         goto err;
2430                         }
2431
2432                 i=DH_compute_key(p,pub,dh_srvr);
2433
2434                 if (i <= 0)
2435                         {
2436                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2437                         BN_clear_free(pub);
2438                         goto err;
2439                         }
2440
2441                 DH_free(s->s3->tmp.dh);
2442                 s->s3->tmp.dh=NULL;
2443                 if (dh_clnt)
2444                         DH_free(dh_clnt);
2445                 else
2446                         BN_clear_free(pub);
2447                 pub=NULL;
2448                 s->session->master_key_length=
2449                         s->method->ssl3_enc->generate_master_secret(s,
2450                                 s->session->master_key,p,i);
2451                 OPENSSL_cleanse(p,i);
2452                 if (dh_clnt)
2453                         return 2;
2454                 }
2455         else
2456 #endif
2457 #ifndef OPENSSL_NO_KRB5
2458         if (alg_k & SSL_kKRB5)
2459                 {
2460                 krb5_error_code         krb5rc;
2461                 krb5_data               enc_ticket;
2462                 krb5_data               authenticator;
2463                 krb5_data               enc_pms;
2464                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2465                 EVP_CIPHER_CTX          ciph_ctx;
2466                 const EVP_CIPHER        *enc = NULL;
2467                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2468                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2469                                                + EVP_MAX_BLOCK_LENGTH];
2470                 int                  padl, outl;
2471                 krb5_timestamp          authtime = 0;
2472                 krb5_ticket_times       ttimes;
2473
2474                 EVP_CIPHER_CTX_init(&ciph_ctx);
2475
2476                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2477
2478                 n2s(p,i);
2479                 enc_ticket.length = i;
2480
2481                 if (n < (long)(enc_ticket.length + 6))
2482                         {
2483                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2484                                 SSL_R_DATA_LENGTH_TOO_LONG);
2485                         goto err;
2486                         }
2487
2488                 enc_ticket.data = (char *)p;
2489                 p+=enc_ticket.length;
2490
2491                 n2s(p,i);
2492                 authenticator.length = i;
2493
2494                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2495                         {
2496                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2497                                 SSL_R_DATA_LENGTH_TOO_LONG);
2498                         goto err;
2499                         }
2500
2501                 authenticator.data = (char *)p;
2502                 p+=authenticator.length;
2503
2504                 n2s(p,i);
2505                 enc_pms.length = i;
2506                 enc_pms.data = (char *)p;
2507                 p+=enc_pms.length;
2508
2509                 /* Note that the length is checked again below,
2510                 ** after decryption
2511                 */
2512                 if(enc_pms.length > sizeof pms)
2513                         {
2514                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2515                                SSL_R_DATA_LENGTH_TOO_LONG);
2516                         goto err;
2517                         }
2518
2519                 if (n != (long)(enc_ticket.length + authenticator.length +
2520                                                 enc_pms.length + 6))
2521                         {
2522                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2523                                 SSL_R_DATA_LENGTH_TOO_LONG);
2524                         goto err;
2525                         }
2526
2527                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2528                                         &kssl_err)) != 0)
2529                         {
2530 #ifdef KSSL_DEBUG
2531                         printf("kssl_sget_tkt rtn %d [%d]\n",
2532                                 krb5rc, kssl_err.reason);
2533                         if (kssl_err.text)
2534                                 printf("kssl_err text= %s\n", kssl_err.text);
2535 #endif  /* KSSL_DEBUG */
2536                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2537                                 kssl_err.reason);
2538                         goto err;
2539                         }
2540
2541                 /*  Note: no authenticator is not considered an error,
2542                 **  but will return authtime == 0.
2543                 */
2544                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2545                                         &authtime, &kssl_err)) != 0)
2546                         {
2547 #ifdef KSSL_DEBUG
2548                         printf("kssl_check_authent rtn %d [%d]\n",
2549                                 krb5rc, kssl_err.reason);
2550                         if (kssl_err.text)
2551                                 printf("kssl_err text= %s\n", kssl_err.text);
2552 #endif  /* KSSL_DEBUG */
2553                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2554                                 kssl_err.reason);
2555                         goto err;
2556                         }
2557
2558                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2559                         {
2560                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2561                         goto err;
2562                         }
2563
2564 #ifdef KSSL_DEBUG
2565                 kssl_ctx_show(kssl_ctx);
2566 #endif  /* KSSL_DEBUG */
2567
2568                 enc = kssl_map_enc(kssl_ctx->enctype);
2569                 if (enc == NULL)
2570                     goto err;
2571
2572                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2573
2574                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2575                         {
2576                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2577                                 SSL_R_DECRYPTION_FAILED);
2578                         goto err;
2579                         }
2580                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2581                                         (unsigned char *)enc_pms.data, enc_pms.length))
2582                         {
2583                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2584                                 SSL_R_DECRYPTION_FAILED);
2585                         goto err;
2586                         }
2587                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2588                         {
2589                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2590                                 SSL_R_DATA_LENGTH_TOO_LONG);
2591                         goto err;
2592                         }
2593                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2594                         {
2595                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2596                                 SSL_R_DECRYPTION_FAILED);
2597                         goto err;
2598                         }
2599                 outl += padl;
2600                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2601                         {
2602                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2603                                 SSL_R_DATA_LENGTH_TOO_LONG);
2604                         goto err;
2605                         }
2606                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2607                     {
2608                     /* The premaster secret must contain the same version number as the
2609                      * ClientHello to detect version rollback attacks (strangely, the
2610                      * protocol does not offer such protection for DH ciphersuites).
2611                      * However, buggy clients exist that send random bytes instead of
2612                      * the protocol version.
2613                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2614                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2615                      */
2616                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2617                         {
2618                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2619                                SSL_AD_DECODE_ERROR);
2620                         goto err;
2621                         }
2622                     }
2623
2624                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2625
2626                 s->session->master_key_length=
2627                         s->method->ssl3_enc->generate_master_secret(s,
2628                                 s->session->master_key, pms, outl);
2629
2630                 if (kssl_ctx->client_princ)
2631                         {
2632                         size_t len = strlen(kssl_ctx->client_princ);
2633                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2634                                 {
2635                                 s->session->krb5_client_princ_len = len;
2636                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2637                                 }
2638                         }
2639
2640
2641                 /*  Was doing kssl_ctx_free() here,
2642                 **  but it caused problems for apache.
2643                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2644                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2645                 */
2646                 }
2647         else
2648 #endif  /* OPENSSL_NO_KRB5 */
2649
2650 #ifndef OPENSSL_NO_ECDH
2651                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2652                 {
2653                 int ret = 1;
2654                 int field_size = 0;
2655                 const EC_KEY   *tkey;
2656                 const EC_GROUP *group;
2657                 const BIGNUM *priv_key;
2658
2659                 /* initialize structures for server's ECDH key pair */
2660                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2661                         {
2662                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2663                             ERR_R_MALLOC_FAILURE);
2664                         goto err;
2665                         }
2666
2667                 /* Let's get server private key and group information */
2668                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2669                         { 
2670                         /* use the certificate */
2671                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2672                         }
2673                 else
2674                         {
2675                         /* use the ephermeral values we saved when
2676                          * generating the ServerKeyExchange msg.
2677                          */
2678                         tkey = s->s3->tmp.ecdh;
2679                         }
2680
2681                 group    = EC_KEY_get0_group(tkey);
2682                 priv_key = EC_KEY_get0_private_key(tkey);
2683
2684                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2685                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2686                         {
2687                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2688                                ERR_R_EC_LIB);
2689                         goto err;
2690                         }
2691
2692                 /* Let's get client's public key */
2693                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2694                         {
2695                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2696                             ERR_R_MALLOC_FAILURE);
2697                         goto err;
2698                         }
2699
2700                 if (n == 0L) 
2701                         {
2702                         /* Client Publickey was in Client Certificate */
2703
2704                          if (alg_k & SSL_kEECDH)
2705                                  {
2706                                  al=SSL_AD_HANDSHAKE_FAILURE;
2707                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2708                                  goto f_err;
2709                                  }
2710                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2711                             == NULL) || 
2712                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2713                                 {
2714                                 /* XXX: For now, we do not support client
2715                                  * authentication using ECDH certificates
2716                                  * so this branch (n == 0L) of the code is
2717                                  * never executed. When that support is
2718                                  * added, we ought to ensure the key 
2719                                  * received in the certificate is 
2720                                  * authorized for key agreement.
2721                                  * ECDH_compute_key implicitly checks that
2722                                  * the two ECDH shares are for the same
2723                                  * group.
2724                                  */
2725                                 al=SSL_AD_HANDSHAKE_FAILURE;
2726                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2727                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2728                                 goto f_err;
2729                                 }
2730
2731                         if (EC_POINT_copy(clnt_ecpoint,
2732                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2733                                 {
2734                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2735                                         ERR_R_EC_LIB);
2736                                 goto err;
2737                                 }
2738                         ret = 2; /* Skip certificate verify processing */
2739                         }
2740                 else
2741                         {
2742                         /* Get client's public key from encoded point
2743                          * in the ClientKeyExchange message.
2744                          */
2745                         if ((bn_ctx = BN_CTX_new()) == NULL)
2746                                 {
2747                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2748                                     ERR_R_MALLOC_FAILURE);
2749                                 goto err;
2750                                 }
2751
2752                         /* Get encoded point length */
2753                         i = *p; 
2754                         p += 1;
2755                         if (n != 1 + i)
2756                                 {
2757                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2758                                     ERR_R_EC_LIB);
2759                                 goto err;
2760                                 }
2761                         if (EC_POINT_oct2point(group, 
2762                             clnt_ecpoint, p, i, bn_ctx) == 0)
2763                                 {
2764                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2765                                     ERR_R_EC_LIB);
2766                                 goto err;
2767                                 }
2768                         /* p is pointing to somewhere in the buffer
2769                          * currently, so set it to the start 
2770                          */ 
2771                         p=(unsigned char *)s->init_buf->data;
2772                         }
2773
2774                 /* Compute the shared pre-master secret */
2775                 field_size = EC_GROUP_get_degree(group);
2776                 if (field_size <= 0)
2777                         {
2778                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2779                                ERR_R_ECDH_LIB);
2780                         goto err;
2781                         }
2782                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2783                 if (i <= 0)
2784                         {
2785                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2786                             ERR_R_ECDH_LIB);
2787                         goto err;
2788                         }
2789
2790                 EVP_PKEY_free(clnt_pub_pkey);
2791                 EC_POINT_free(clnt_ecpoint);
2792                 EC_KEY_free(srvr_ecdh);
2793                 BN_CTX_free(bn_ctx);
2794                 EC_KEY_free(s->s3->tmp.ecdh);
2795                 s->s3->tmp.ecdh = NULL; 
2796
2797                 /* Compute the master secret */
2798                 s->session->master_key_length = s->method->ssl3_enc-> \
2799                     generate_master_secret(s, s->session->master_key, p, i);
2800                 
2801                 OPENSSL_cleanse(p, i);
2802                 return (ret);
2803                 }
2804         else
2805 #endif
2806 #ifndef OPENSSL_NO_PSK
2807                 if (alg_k & SSL_kPSK)
2808                         {
2809                         unsigned char *t = NULL;
2810                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2811                         unsigned int pre_ms_len = 0, psk_len = 0;
2812                         int psk_err = 1;
2813                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2814
2815                         al=SSL_AD_HANDSHAKE_FAILURE;
2816
2817                         n2s(p,i);
2818                         if (n != i+2)
2819                                 {
2820                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2821                                         SSL_R_LENGTH_MISMATCH);
2822                                 goto psk_err;
2823                                 }
2824                         if (i > PSK_MAX_IDENTITY_LEN)
2825                                 {
2826                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2827                                         SSL_R_DATA_LENGTH_TOO_LONG);
2828                                 goto psk_err;
2829                                 }
2830                         if (s->psk_server_callback == NULL)
2831                                 {
2832                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2833                                        SSL_R_PSK_NO_SERVER_CB);
2834                                 goto psk_err;
2835                                 }
2836
2837                         /* Create guaranteed NULL-terminated identity
2838                          * string for the callback */
2839                         memcpy(tmp_id, p, i);
2840                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2841                         psk_len = s->psk_server_callback(s, tmp_id,
2842                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2843                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2844
2845                         if (psk_len > PSK_MAX_PSK_LEN)
2846                                 {
2847                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2848                                         ERR_R_INTERNAL_ERROR);
2849                                 goto psk_err;
2850                                 }
2851                         else if (psk_len == 0)
2852                                 {
2853                                 /* PSK related to the given identity not found */
2854                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2855                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2856                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2857                                 goto psk_err;
2858                                 }
2859
2860                         /* create PSK pre_master_secret */
2861                         pre_ms_len=2+psk_len+2+psk_len;
2862                         t = psk_or_pre_ms;
2863                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2864                         s2n(psk_len, t);
2865                         memset(t, 0, psk_len);
2866                         t+=psk_len;
2867                         s2n(psk_len, t);
2868
2869                         if (s->session->psk_identity != NULL)
2870                                 OPENSSL_free(s->session->psk_identity);
2871                         s->session->psk_identity = BUF_strdup((char *)p);
2872                         if (s->session->psk_identity == NULL)
2873                                 {
2874                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2875                                         ERR_R_MALLOC_FAILURE);
2876                                 goto psk_err;
2877                                 }
2878
2879                         if (s->session->psk_identity_hint != NULL)
2880                                 OPENSSL_free(s->session->psk_identity_hint);
2881                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2882                         if (s->ctx->psk_identity_hint != NULL &&
2883                                 s->session->psk_identity_hint == NULL)
2884                                 {
2885                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2886                                         ERR_R_MALLOC_FAILURE);
2887                                 goto psk_err;
2888                                 }
2889
2890                         s->session->master_key_length=
2891                                 s->method->ssl3_enc->generate_master_secret(s,
2892                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2893                         psk_err = 0;
2894                 psk_err:
2895                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2896                         if (psk_err != 0)
2897                                 goto f_err;
2898                         }
2899                 else
2900 #endif
2901 #ifndef OPENSSL_NO_SRP
2902                 if (alg_k & SSL_kSRP)
2903                         {
2904                         int param_len;
2905
2906                         n2s(p,i);
2907                         param_len=i+2;
2908                         if (param_len > n)
2909                                 {
2910                                 al=SSL_AD_DECODE_ERROR;
2911                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2912                                 goto f_err;
2913                                 }
2914                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2915                                 {
2916                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2917                                 goto err;
2918                                 }
2919                         if (s->session->srp_username != NULL)
2920                                 OPENSSL_free(s->session->srp_username);
2921                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2922                         if (s->session->srp_username == NULL)
2923                                 {
2924                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2925                                         ERR_R_MALLOC_FAILURE);
2926                                 goto err;
2927                                 }
2928
2929                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2930                                 {
2931                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2932                                 goto err;
2933                                 }
2934
2935                         p+=i;
2936                         }
2937                 else
2938 #endif  /* OPENSSL_NO_SRP */
2939                 if (alg_k & SSL_kGOST) 
2940                         {
2941                         int ret = 0;
2942                         EVP_PKEY_CTX *pkey_ctx;
2943                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2944                         unsigned char premaster_secret[32], *start;
2945                         size_t outlen=32, inlen;
2946                         unsigned long alg_a;
2947
2948                         /* Get our certificate private key*/
2949                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2950                         if (alg_a & SSL_aGOST94)
2951                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2952                         else if (alg_a & SSL_aGOST01)
2953                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2954
2955                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2956                         EVP_PKEY_decrypt_init(pkey_ctx);
2957                         /* If client certificate is present and is of the same type, maybe
2958                          * use it for key exchange.  Don't mind errors from
2959                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2960                          * a client certificate for authorization only. */
2961                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2962                         if (client_pub_pkey)
2963                                 {
2964                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2965                                         ERR_clear_error();
2966                                 }
2967                         /* Decrypt session key */
2968                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED))) 
2969                                 {
2970                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2971                                 goto gerr;
2972                                 }
2973                         if (p[1] == 0x81)
2974                                 {
2975                                 start = p+3;
2976                                 inlen = p[2];
2977                                 }
2978                         else if (p[1] < 0x80)
2979                                 {
2980                                 start = p+2;
2981                                 inlen = p[1];
2982                                 }
2983                         else
2984                                 {
2985                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2986                                 goto gerr;
2987                                 }
2988                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0) 
2989
2990                                 {
2991                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2992                                 goto gerr;
2993                                 }
2994                         /* Generate master secret */
2995                         s->session->master_key_length=
2996                                 s->method->ssl3_enc->generate_master_secret(s,
2997                                         s->session->master_key,premaster_secret,32);
2998                         /* Check if pubkey from client certificate was used */
2999                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
3000                                 ret = 2;
3001                         else
3002                                 ret = 1;
3003                 gerr:
3004                         EVP_PKEY_free(client_pub_pkey);
3005                         EVP_PKEY_CTX_free(pkey_ctx);
3006                         if (ret)
3007                                 return ret;
3008                         else
3009                                 goto err;
3010                         }
3011                 else
3012                 {
3013                 al=SSL_AD_HANDSHAKE_FAILURE;
3014                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
3015                                 SSL_R_UNKNOWN_CIPHER_TYPE);
3016                 goto f_err;
3017                 }
3018
3019         return(1);
3020 f_err:
3021         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3022 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
3023 err:
3024 #endif
3025 #ifndef OPENSSL_NO_ECDH
3026         EVP_PKEY_free(clnt_pub_pkey);
3027         EC_POINT_free(clnt_ecpoint);
3028         if (srvr_ecdh != NULL) 
3029                 EC_KEY_free(srvr_ecdh);
3030         BN_CTX_free(bn_ctx);
3031 #endif
3032         return(-1);
3033         }
3034
3035 int ssl3_get_cert_verify(SSL *s)
3036         {
3037         EVP_PKEY *pkey=NULL;
3038         unsigned char *p;
3039         int al,ok,ret=0;
3040         long n;
3041         int type=0,i,j;
3042         X509 *peer;
3043         const EVP_MD *md = NULL;
3044         EVP_MD_CTX mctx;
3045         EVP_MD_CTX_init(&mctx);
3046
3047         n=s->method->ssl_get_message(s,
3048                 SSL3_ST_SR_CERT_VRFY_A,
3049                 SSL3_ST_SR_CERT_VRFY_B,
3050                 -1,
3051                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
3052                 &ok);
3053
3054         if (!ok) return((int)n);
3055
3056         if (s->session->peer != NULL)
3057                 {
3058                 peer=s->session->peer;
3059                 pkey=X509_get_pubkey(peer);
3060                 type=X509_certificate_type(peer,pkey);
3061                 }
3062         else
3063                 {
3064                 peer=NULL;
3065                 pkey=NULL;
3066                 }
3067
3068         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3069                 {
3070                 s->s3->tmp.reuse_message=1;
3071                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3072                         {
3073                         al=SSL_AD_UNEXPECTED_MESSAGE;
3074                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3075                         goto f_err;
3076                         }
3077                 ret=1;
3078                 goto end;
3079                 }
3080
3081         if (peer == NULL)
3082                 {
3083                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3084                 al=SSL_AD_UNEXPECTED_MESSAGE;
3085                 goto f_err;
3086                 }
3087
3088         if (!(type & EVP_PKT_SIGN))
3089                 {
3090                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3091                 al=SSL_AD_ILLEGAL_PARAMETER;
3092                 goto f_err;
3093                 }
3094
3095         if (s->s3->change_cipher_spec)
3096                 {
3097                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3098                 al=SSL_AD_UNEXPECTED_MESSAGE;
3099                 goto f_err;
3100                 }
3101
3102         /* we now have a signature that we need to verify */
3103         p=(unsigned char *)s->init_msg;
3104         /* Check for broken implementations of GOST ciphersuites */
3105         /* If key is GOST and n is exactly 64, it is bare
3106          * signature without length field */
3107         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3108                 pkey->type == NID_id_GostR3410_2001) )
3109                 {
3110                 i=64;
3111                 } 
3112         else 
3113                 {       
3114                 if (SSL_USE_SIGALGS(s))
3115                         {
3116                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
3117                         if (rv == -1)
3118                                 {
3119                                 al = SSL_AD_INTERNAL_ERROR;
3120                                 goto f_err;
3121                                 }
3122                         else if (rv == 0)
3123                                 {
3124                                 al = SSL_AD_DECODE_ERROR;
3125                                 goto f_err;
3126                                 }
3127 #ifdef SSL_DEBUG
3128 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3129 #endif
3130                         p += 2;
3131                         n -= 2;
3132                         }
3133                 n2s(p,i);
3134                 n-=2;
3135                 if (i > n)
3136                         {
3137                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3138                         al=SSL_AD_DECODE_ERROR;
3139                         goto f_err;
3140                         }
3141         }
3142         j=EVP_PKEY_size(pkey);
3143         if ((i > j) || (n > j) || (n <= 0))
3144                 {
3145                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3146                 al=SSL_AD_DECODE_ERROR;
3147                 goto f_err;
3148                 }
3149
3150         if (SSL_USE_SIGALGS(s))
3151                 {
3152                 long hdatalen = 0;
3153                 void *hdata;
3154                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3155                 if (hdatalen <= 0)
3156                         {
3157                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3158                         al=SSL_AD_INTERNAL_ERROR;
3159                         goto f_err;
3160                         }
3161 #ifdef SSL_DEBUG
3162                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3163                                                         EVP_MD_name(md));
3164 #endif
3165                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3166                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3167                         {
3168                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3169                         al=SSL_AD_INTERNAL_ERROR;
3170                         goto f_err;
3171                         }
3172
3173                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3174                         {
3175                         al=SSL_AD_DECRYPT_ERROR;
3176                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3177                         goto f_err;
3178                         }
3179                 }
3180         else
3181 #ifndef OPENSSL_NO_RSA 
3182         if (pkey->type == EVP_PKEY_RSA)
3183                 {
3184                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3185                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
3186                                                         pkey->pkey.rsa);
3187                 if (i < 0)
3188                         {
3189                         al=SSL_AD_DECRYPT_ERROR;
3190                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3191                         goto f_err;
3192                         }
3193                 if (i == 0)
3194                         {
3195                         al=SSL_AD_DECRYPT_ERROR;
3196                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3197                         goto f_err;
3198                         }
3199                 }
3200         else
3201 #endif
3202 #ifndef OPENSSL_NO_DSA
3203                 if (pkey->type == EVP_PKEY_DSA)
3204                 {
3205                 j=DSA_verify(pkey->save_type,
3206                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3207                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3208                 if (j <= 0)
3209                         {
3210                         /* bad signature */
3211                         al=SSL_AD_DECRYPT_ERROR;
3212                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3213                         goto f_err;
3214                         }
3215                 }
3216         else
3217 #endif
3218 #ifndef OPENSSL_NO_ECDSA
3219                 if (pkey->type == EVP_PKEY_EC)
3220                 {
3221                 j=ECDSA_verify(pkey->save_type,
3222                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3223                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3224                 if (j <= 0)
3225                         {
3226                         /* bad signature */
3227                         al=SSL_AD_DECRYPT_ERROR;
3228                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3229                             SSL_R_BAD_ECDSA_SIGNATURE);
3230                         goto f_err;
3231                         }
3232                 }
3233         else
3234 #endif
3235         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3236                 {   unsigned char signature[64];
3237                         int idx;
3238                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3239                         EVP_PKEY_verify_init(pctx);
3240                         if (i!=64) {
3241                                 fprintf(stderr,"GOST signature length is %d",i);
3242                         }       
3243                         for (idx=0;idx<64;idx++) {
3244                                 signature[63-idx]=p[idx];
3245                         }       
3246                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3247                         EVP_PKEY_CTX_free(pctx);
3248                         if (j<=0) 
3249                                 {
3250                                 al=SSL_AD_DECRYPT_ERROR;
3251                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3252                                         SSL_R_BAD_ECDSA_SIGNATURE);
3253                                 goto f_err;
3254                                 }       
3255                 }
3256         else    
3257                 {
3258                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3259                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3260                 goto f_err;
3261                 }
3262
3263
3264         ret=1;
3265         if (0)
3266                 {
3267 f_err:
3268                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3269                 }
3270 end:
3271         if (s->s3->handshake_buffer)
3272                 {
3273                 BIO_free(s->s3->handshake_buffer);
3274                 s->s3->handshake_buffer = NULL;
3275                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3276                 }
3277         EVP_MD_CTX_cleanup(&mctx);
3278         EVP_PKEY_free(pkey);
3279         return(ret);
3280         }
3281
3282 int ssl3_get_client_certificate(SSL *s)
3283         {
3284         int i,ok,al,ret= -1;
3285         X509 *x=NULL;
3286         unsigned long l,nc,llen,n;
3287         const unsigned char *p,*q;
3288         unsigned char *d;
3289         STACK_OF(X509) *sk=NULL;
3290
3291         n=s->method->ssl_get_message(s,
3292                 SSL3_ST_SR_CERT_A,
3293                 SSL3_ST_SR_CERT_B,
3294                 -1,
3295                 s->max_cert_list,
3296                 &ok);
3297
3298         if (!ok) return((int)n);
3299
3300         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3301                 {
3302                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3303                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3304                         {
3305                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3306                         al=SSL_AD_HANDSHAKE_FAILURE;
3307                         goto f_err;
3308                         }
3309                 /* If tls asked for a client cert, the client must return a 0 list */
3310                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3311                         {
3312                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3313                         al=SSL_AD_UNEXPECTED_MESSAGE;
3314                         goto f_err;
3315                         }
3316                 s->s3->tmp.reuse_message=1;
3317                 return(1);
3318                 }
3319
3320         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3321                 {
3322                 al=SSL_AD_UNEXPECTED_MESSAGE;
3323                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3324                 goto f_err;
3325                 }
3326         p=d=(unsigned char *)s->init_msg;
3327
3328         if ((sk=sk_X509_new_null()) == NULL)
3329                 {
3330                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3331                 goto err;
3332                 }
3333
3334         n2l3(p,llen);
3335         if (llen+3 != n)
3336                 {
3337                 al=SSL_AD_DECODE_ERROR;
3338                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3339                 goto f_err;
3340                 }
3341         for (nc=0; nc<llen; )
3342                 {
3343                 n2l3(p,l);
3344                 if ((l+nc+3) > llen)
3345                         {
3346                         al=SSL_AD_DECODE_ERROR;
3347                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3348                         goto f_err;
3349                         }
3350
3351                 q=p;
3352                 x=d2i_X509(NULL,&p,l);
3353                 if (x == NULL)
3354                         {
3355                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);