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Disable SSL renegotiation in order to protect against a serious
[FreeBSD/releng/8.0.git] / crypto / openssl / ssl / s3_srvr.c
1 /* ssl/s3_srvr.c */
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) 1998-2005 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 #define REUSE_CIPHER_BUG
126 #define NETSCAPE_HANG_BUG
127
128 #include <stdio.h>
129 #include "ssl_locl.h"
130 #include "kssl_lcl.h"
131 #include <openssl/buffer.h>
132 #include <openssl/rand.h>
133 #include <openssl/objects.h>
134 #include <openssl/evp.h>
135 #include <openssl/hmac.h>
136 #include <openssl/x509.h>
137 #ifndef OPENSSL_NO_DH
138 #include <openssl/dh.h>
139 #endif
140 #include <openssl/bn.h>
141 #ifndef OPENSSL_NO_KRB5
142 #include <openssl/krb5_asn.h>
143 #endif
144 #include <openssl/md5.h>
145
146 static SSL_METHOD *ssl3_get_server_method(int ver);
147 #ifndef OPENSSL_NO_ECDH
148 static int nid2curve_id(int nid);
149 #endif
150
151 static SSL_METHOD *ssl3_get_server_method(int ver)
152         {
153         if (ver == SSL3_VERSION)
154                 return(SSLv3_server_method());
155         else
156                 return(NULL);
157         }
158
159 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
160                         ssl3_accept,
161                         ssl_undefined_function,
162                         ssl3_get_server_method)
163
164 int ssl3_accept(SSL *s)
165         {
166         BUF_MEM *buf;
167         unsigned long l,Time=(unsigned long)time(NULL);
168         void (*cb)(const SSL *ssl,int type,int val)=NULL;
169         long num1;
170         int ret= -1;
171         int new_state,state,skip=0;
172
173         RAND_add(&Time,sizeof(Time),0);
174         ERR_clear_error();
175         clear_sys_error();
176
177         if (s->info_callback != NULL)
178                 cb=s->info_callback;
179         else if (s->ctx->info_callback != NULL)
180                 cb=s->ctx->info_callback;
181
182         /* init things to blank */
183         s->in_handshake++;
184         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
185
186         if (s->cert == NULL)
187                 {
188                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
189                 return(-1);
190                 }
191
192         for (;;)
193                 {
194                 state=s->state;
195
196                 switch (s->state)
197                         {
198                 case SSL_ST_RENEGOTIATE:
199                         s->new_session=1;
200                         /* s->state=SSL_ST_ACCEPT; */
201
202                 case SSL_ST_BEFORE:
203                 case SSL_ST_ACCEPT:
204                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
205                 case SSL_ST_OK|SSL_ST_ACCEPT:
206
207                         s->server=1;
208                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
209
210                         if ((s->version>>8) != 3)
211                                 {
212                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
213                                 return -1;
214                                 }
215                         s->type=SSL_ST_ACCEPT;
216
217                         if (s->init_buf == NULL)
218                                 {
219                                 if ((buf=BUF_MEM_new()) == NULL)
220                                         {
221                                         ret= -1;
222                                         goto end;
223                                         }
224                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
225                                         {
226                                         ret= -1;
227                                         goto end;
228                                         }
229                                 s->init_buf=buf;
230                                 }
231
232                         if (!ssl3_setup_buffers(s))
233                                 {
234                                 ret= -1;
235                                 goto end;
236                                 }
237
238                         s->init_num=0;
239
240                         if (s->state != SSL_ST_RENEGOTIATE)
241                                 {
242                                 /* Ok, we now need to push on a buffering BIO so that
243                                  * the output is sent in a way that TCP likes :-)
244                                  */
245                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
246                                 
247                                 ssl3_init_finished_mac(s);
248                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
249                                 s->ctx->stats.sess_accept++;
250                                 }
251                         else
252                                 {
253                                 /* s->state == SSL_ST_RENEGOTIATE,
254                                  * we will just send a HelloRequest */
255                                 s->ctx->stats.sess_accept_renegotiate++;
256                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
257                                 }
258                         break;
259
260                 case SSL3_ST_SW_HELLO_REQ_A:
261                 case SSL3_ST_SW_HELLO_REQ_B:
262
263                         s->shutdown=0;
264                         ret=ssl3_send_hello_request(s);
265                         if (ret <= 0) goto end;
266                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
267                         s->state=SSL3_ST_SW_FLUSH;
268                         s->init_num=0;
269
270                         ssl3_init_finished_mac(s);
271                         break;
272
273                 case SSL3_ST_SW_HELLO_REQ_C:
274                         s->state=SSL_ST_OK;
275                         break;
276
277                 case SSL3_ST_SR_CLNT_HELLO_A:
278                 case SSL3_ST_SR_CLNT_HELLO_B:
279                 case SSL3_ST_SR_CLNT_HELLO_C:
280
281                         s->shutdown=0;
282                         ret=ssl3_get_client_hello(s);
283                         if (ret <= 0) goto end;
284                         s->new_session = 2;
285                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
286                         s->init_num=0;
287                         break;
288
289                 case SSL3_ST_SW_SRVR_HELLO_A:
290                 case SSL3_ST_SW_SRVR_HELLO_B:
291                         ret=ssl3_send_server_hello(s);
292                         if (ret <= 0) goto end;
293 #ifndef OPENSSL_NO_TLSEXT
294                         if (s->hit)
295                                 {
296                                 if (s->tlsext_ticket_expected)
297                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
298                                 else
299                                         s->state=SSL3_ST_SW_CHANGE_A;
300                                 }
301 #else
302                         if (s->hit)
303                                         s->state=SSL3_ST_SW_CHANGE_A;
304 #endif
305                         else
306                                 s->state=SSL3_ST_SW_CERT_A;
307                         s->init_num=0;
308                         break;
309
310                 case SSL3_ST_SW_CERT_A:
311                 case SSL3_ST_SW_CERT_B:
312                         /* Check if it is anon DH or anon ECDH or KRB5 */
313                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)
314                                 && !(s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
315                                 {
316                                 ret=ssl3_send_server_certificate(s);
317                                 if (ret <= 0) goto end;
318 #ifndef OPENSSL_NO_TLSEXT
319                                 if (s->tlsext_status_expected)
320                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
321                                 else
322                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
323                                 }
324                         else
325                                 {
326                                 skip = 1;
327                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
328                                 }
329 #else
330                                 }
331                         else
332                                 skip=1;
333
334                         s->state=SSL3_ST_SW_KEY_EXCH_A;
335 #endif
336                         s->init_num=0;
337                         break;
338
339                 case SSL3_ST_SW_KEY_EXCH_A:
340                 case SSL3_ST_SW_KEY_EXCH_B:
341                         l=s->s3->tmp.new_cipher->algorithms;
342
343                         /* clear this, it may get reset by
344                          * send_server_key_exchange */
345                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
346 #ifndef OPENSSL_NO_KRB5
347                                 && !(l & SSL_KRB5)
348 #endif /* OPENSSL_NO_KRB5 */
349                                 )
350                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
351                                  * even when forbidden by protocol specs
352                                  * (handshake may fail as clients are not required to
353                                  * be able to handle this) */
354                                 s->s3->tmp.use_rsa_tmp=1;
355                         else
356                                 s->s3->tmp.use_rsa_tmp=0;
357
358
359                         /* only send if a DH key exchange, fortezza or
360                          * RSA but we have a sign only certificate
361                          *
362                          * For ECC ciphersuites, we send a serverKeyExchange
363                          * message only if the cipher suite is either
364                          * ECDH-anon or ECDHE. In other cases, the
365                          * server certificate contains the server's 
366                          * public key for key exchange.
367                          */
368                         if (s->s3->tmp.use_rsa_tmp
369                             || (l & SSL_kECDHE)
370                             || (l & (SSL_DH|SSL_kFZA))
371                             || ((l & SSL_kRSA)
372                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
373                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
374                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
375                                         )
376                                     )
377                                 )
378                             )
379                                 {
380                                 ret=ssl3_send_server_key_exchange(s);
381                                 if (ret <= 0) goto end;
382                                 }
383                         else
384                                 skip=1;
385
386                         s->state=SSL3_ST_SW_CERT_REQ_A;
387                         s->init_num=0;
388                         break;
389
390                 case SSL3_ST_SW_CERT_REQ_A:
391                 case SSL3_ST_SW_CERT_REQ_B:
392                         if (/* don't request cert unless asked for it: */
393                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
394                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
395                                  * don't request cert during re-negotiation: */
396                                 ((s->session->peer != NULL) &&
397                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
398                                 /* never request cert in anonymous ciphersuites
399                                  * (see section "Certificate request" in SSL 3 drafts
400                                  * and in RFC 2246): */
401                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
402                                  /* ... except when the application insists on verification
403                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
404                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
405                                  /* never request cert in Kerberos ciphersuites */
406                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
407                                 {
408                                 /* no cert request */
409                                 skip=1;
410                                 s->s3->tmp.cert_request=0;
411                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
412                                 }
413                         else
414                                 {
415                                 s->s3->tmp.cert_request=1;
416                                 ret=ssl3_send_certificate_request(s);
417                                 if (ret <= 0) goto end;
418 #ifndef NETSCAPE_HANG_BUG
419                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
420 #else
421                                 s->state=SSL3_ST_SW_FLUSH;
422                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
423 #endif
424                                 s->init_num=0;
425                                 }
426                         break;
427
428                 case SSL3_ST_SW_SRVR_DONE_A:
429                 case SSL3_ST_SW_SRVR_DONE_B:
430                         ret=ssl3_send_server_done(s);
431                         if (ret <= 0) goto end;
432                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
433                         s->state=SSL3_ST_SW_FLUSH;
434                         s->init_num=0;
435                         break;
436                 
437                 case SSL3_ST_SW_FLUSH:
438                         /* number of bytes to be flushed */
439                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
440                         if (num1 > 0)
441                                 {
442                                 s->rwstate=SSL_WRITING;
443                                 num1=BIO_flush(s->wbio);
444                                 if (num1 <= 0) { ret= -1; goto end; }
445                                 s->rwstate=SSL_NOTHING;
446                                 }
447
448                         s->state=s->s3->tmp.next_state;
449                         break;
450
451                 case SSL3_ST_SR_CERT_A:
452                 case SSL3_ST_SR_CERT_B:
453                         /* Check for second client hello (MS SGC) */
454                         ret = ssl3_check_client_hello(s);
455                         if (ret <= 0)
456                                 goto end;
457                         if (ret == 2)
458                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
459                         else {
460                                 if (s->s3->tmp.cert_request)
461                                         {
462                                         ret=ssl3_get_client_certificate(s);
463                                         if (ret <= 0) goto end;
464                                         }
465                                 s->init_num=0;
466                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
467                         }
468                         break;
469
470                 case SSL3_ST_SR_KEY_EXCH_A:
471                 case SSL3_ST_SR_KEY_EXCH_B:
472                         ret=ssl3_get_client_key_exchange(s);
473                         if (ret <= 0) 
474                                 goto end;
475                         if (ret == 2)
476                                 {
477                                 /* For the ECDH ciphersuites when
478                                  * the client sends its ECDH pub key in
479                                  * a certificate, the CertificateVerify
480                                  * message is not sent.
481                                  */
482                                 s->state=SSL3_ST_SR_FINISHED_A;
483                                 s->init_num = 0;
484                                 }
485                         else   
486                                 {
487                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
488                                 s->init_num=0;
489
490                                 /* We need to get hashes here so if there is
491                                  * a client cert, it can be verified
492                                  */ 
493                                 s->method->ssl3_enc->cert_verify_mac(s,
494                                     &(s->s3->finish_dgst1),
495                                     &(s->s3->tmp.cert_verify_md[0]));
496                                 s->method->ssl3_enc->cert_verify_mac(s,
497                                     &(s->s3->finish_dgst2),
498                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
499                                 }
500                         break;
501
502                 case SSL3_ST_SR_CERT_VRFY_A:
503                 case SSL3_ST_SR_CERT_VRFY_B:
504
505                         /* we should decide if we expected this one */
506                         ret=ssl3_get_cert_verify(s);
507                         if (ret <= 0) goto end;
508
509                         s->state=SSL3_ST_SR_FINISHED_A;
510                         s->init_num=0;
511                         break;
512
513                 case SSL3_ST_SR_FINISHED_A:
514                 case SSL3_ST_SR_FINISHED_B:
515                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
516                                 SSL3_ST_SR_FINISHED_B);
517                         if (ret <= 0) goto end;
518                         if (s->hit)
519                                 s->state=SSL_ST_OK;
520 #ifndef OPENSSL_NO_TLSEXT
521                         else if (s->tlsext_ticket_expected)
522                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
523 #endif
524                         else
525                                 s->state=SSL3_ST_SW_CHANGE_A;
526                         s->init_num=0;
527                         break;
528
529 #ifndef OPENSSL_NO_TLSEXT
530                 case SSL3_ST_SW_SESSION_TICKET_A:
531                 case SSL3_ST_SW_SESSION_TICKET_B:
532                         ret=ssl3_send_newsession_ticket(s);
533                         if (ret <= 0) goto end;
534                         s->state=SSL3_ST_SW_CHANGE_A;
535                         s->init_num=0;
536                         break;
537
538                 case SSL3_ST_SW_CERT_STATUS_A:
539                 case SSL3_ST_SW_CERT_STATUS_B:
540                         ret=ssl3_send_cert_status(s);
541                         if (ret <= 0) goto end;
542                         s->state=SSL3_ST_SW_KEY_EXCH_A;
543                         s->init_num=0;
544                         break;
545
546 #endif
547
548                 case SSL3_ST_SW_CHANGE_A:
549                 case SSL3_ST_SW_CHANGE_B:
550
551                         s->session->cipher=s->s3->tmp.new_cipher;
552                         if (!s->method->ssl3_enc->setup_key_block(s))
553                                 { ret= -1; goto end; }
554
555                         ret=ssl3_send_change_cipher_spec(s,
556                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
557
558                         if (ret <= 0) goto end;
559                         s->state=SSL3_ST_SW_FINISHED_A;
560                         s->init_num=0;
561
562                         if (!s->method->ssl3_enc->change_cipher_state(s,
563                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
564                                 {
565                                 ret= -1;
566                                 goto end;
567                                 }
568
569                         break;
570
571                 case SSL3_ST_SW_FINISHED_A:
572                 case SSL3_ST_SW_FINISHED_B:
573                         ret=ssl3_send_finished(s,
574                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
575                                 s->method->ssl3_enc->server_finished_label,
576                                 s->method->ssl3_enc->server_finished_label_len);
577                         if (ret <= 0) goto end;
578                         s->state=SSL3_ST_SW_FLUSH;
579                         if (s->hit)
580                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
581                         else
582                                 s->s3->tmp.next_state=SSL_ST_OK;
583                         s->init_num=0;
584                         break;
585
586                 case SSL_ST_OK:
587                         /* clean a few things up */
588                         ssl3_cleanup_key_block(s);
589
590                         BUF_MEM_free(s->init_buf);
591                         s->init_buf=NULL;
592
593                         /* remove buffering on output */
594                         ssl_free_wbio_buffer(s);
595
596                         s->init_num=0;
597
598                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
599                                 {
600                                 /* actually not necessarily a 'new' session unless
601                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
602                                 
603                                 s->new_session=0;
604                                 
605                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
606                                 
607                                 s->ctx->stats.sess_accept_good++;
608                                 /* s->server=1; */
609                                 s->handshake_func=ssl3_accept;
610
611                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
612                                 }
613                         
614                         ret = 1;
615                         goto end;
616                         /* break; */
617
618                 default:
619                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
620                         ret= -1;
621                         goto end;
622                         /* break; */
623                         }
624                 
625                 if (!s->s3->tmp.reuse_message && !skip)
626                         {
627                         if (s->debug)
628                                 {
629                                 if ((ret=BIO_flush(s->wbio)) <= 0)
630                                         goto end;
631                                 }
632
633
634                         if ((cb != NULL) && (s->state != state))
635                                 {
636                                 new_state=s->state;
637                                 s->state=state;
638                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
639                                 s->state=new_state;
640                                 }
641                         }
642                 skip=0;
643                 }
644 end:
645         /* BIO_flush(s->wbio); */
646
647         s->in_handshake--;
648         if (cb != NULL)
649                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
650         return(ret);
651         }
652
653 int ssl3_send_hello_request(SSL *s)
654         {
655         unsigned char *p;
656
657         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
658                 {
659                 p=(unsigned char *)s->init_buf->data;
660                 *(p++)=SSL3_MT_HELLO_REQUEST;
661                 *(p++)=0;
662                 *(p++)=0;
663                 *(p++)=0;
664
665                 s->state=SSL3_ST_SW_HELLO_REQ_B;
666                 /* number of bytes to write */
667                 s->init_num=4;
668                 s->init_off=0;
669                 }
670
671         /* SSL3_ST_SW_HELLO_REQ_B */
672         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
673         }
674
675 int ssl3_check_client_hello(SSL *s)
676         {
677         int ok;
678         long n;
679
680         /* this function is called when we really expect a Certificate message,
681          * so permit appropriate message length */
682         n=s->method->ssl_get_message(s,
683                 SSL3_ST_SR_CERT_A,
684                 SSL3_ST_SR_CERT_B,
685                 -1,
686                 s->max_cert_list,
687                 &ok);
688         if (!ok) return((int)n);
689         s->s3->tmp.reuse_message = 1;
690         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
691                 {
692                 /* Throw away what we have done so far in the current handshake,
693                  * which will now be aborted. (A full SSL_clear would be too much.)
694                  * I hope that tmp.dh is the only thing that may need to be cleared
695                  * when a handshake is not completed ... */
696 #ifndef OPENSSL_NO_DH
697                 if (s->s3->tmp.dh != NULL)
698                         {
699                         DH_free(s->s3->tmp.dh);
700                         s->s3->tmp.dh = NULL;
701                         }
702 #endif
703                 return 2;
704                 }
705         return 1;
706 }
707
708 int ssl3_get_client_hello(SSL *s)
709         {
710         int i,j,ok,al,ret= -1;
711         unsigned int cookie_len;
712         long n;
713         unsigned long id;
714         unsigned char *p,*d,*q;
715         SSL_CIPHER *c;
716 #ifndef OPENSSL_NO_COMP
717         SSL_COMP *comp=NULL;
718 #endif
719         STACK_OF(SSL_CIPHER) *ciphers=NULL;
720
721         if (s->new_session)
722                 {
723                 al=SSL_AD_HANDSHAKE_FAILURE;
724                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
725                 goto f_err;
726                 }
727
728         /* We do this so that we will respond with our native type.
729          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
730          * This down switching should be handled by a different method.
731          * If we are SSLv3, we will respond with SSLv3, even if prompted with
732          * TLSv1.
733          */
734         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
735                 {
736                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
737                 }
738         s->first_packet=1;
739         n=s->method->ssl_get_message(s,
740                 SSL3_ST_SR_CLNT_HELLO_B,
741                 SSL3_ST_SR_CLNT_HELLO_C,
742                 SSL3_MT_CLIENT_HELLO,
743                 SSL3_RT_MAX_PLAIN_LENGTH,
744                 &ok);
745
746         if (!ok) return((int)n);
747         s->first_packet=0;
748         d=p=(unsigned char *)s->init_msg;
749
750         /* use version from inside client hello, not from record header
751          * (may differ: see RFC 2246, Appendix E, second paragraph) */
752         s->client_version=(((int)p[0])<<8)|(int)p[1];
753         p+=2;
754
755         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
756             (s->version != DTLS1_VERSION && s->client_version < s->version))
757                 {
758                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
759                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR) 
760                         {
761                         /* similar to ssl3_get_record, send alert using remote version number */
762                         s->version = s->client_version;
763                         }
764                 al = SSL_AD_PROTOCOL_VERSION;
765                 goto f_err;
766                 }
767
768         /* load the client random */
769         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
770         p+=SSL3_RANDOM_SIZE;
771
772         /* get the session-id */
773         j= *(p++);
774
775         s->hit=0;
776         /* Versions before 0.9.7 always allow session reuse during renegotiation
777          * (i.e. when s->new_session is true), option
778          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
779          * Maybe this optional behaviour should always have been the default,
780          * but we cannot safely change the default behaviour (or new applications
781          * might be written that become totally unsecure when compiled with
782          * an earlier library version)
783          */
784         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
785                 {
786                 if (!ssl_get_new_session(s,1))
787                         goto err;
788                 }
789         else
790                 {
791                 i=ssl_get_prev_session(s, p, j, d + n);
792                 if (i == 1)
793                         { /* previous session */
794                         s->hit=1;
795                         }
796                 else if (i == -1)
797                         goto err;
798                 else /* i == 0 */
799                         {
800                         if (!ssl_get_new_session(s,1))
801                                 goto err;
802                         }
803                 }
804
805         p+=j;
806
807         if (s->version == DTLS1_VERSION)
808                 {
809                 /* cookie stuff */
810                 cookie_len = *(p++);
811
812                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
813                         s->d1->send_cookie == 0)
814                         {
815                         /* HelloVerifyMessage has already been sent */
816                         if ( cookie_len != s->d1->cookie_len)
817                                 {
818                                 al = SSL_AD_HANDSHAKE_FAILURE;
819                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
820                                 goto f_err;
821                                 }
822                         }
823
824                 /* 
825                  * The ClientHello may contain a cookie even if the
826                  * HelloVerify message has not been sent--make sure that it
827                  * does not cause an overflow.
828                  */
829                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
830                         {
831                         /* too much data */
832                         al = SSL_AD_DECODE_ERROR;
833                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
834                         goto f_err;
835                         }
836
837                 /* verify the cookie if appropriate option is set. */
838                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
839                         cookie_len > 0)
840                         {
841                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
842
843                         if ( s->ctx->app_verify_cookie_cb != NULL)
844                                 {
845                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
846                                         cookie_len) == 0)
847                                         {
848                                         al=SSL_AD_HANDSHAKE_FAILURE;
849                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
850                                                 SSL_R_COOKIE_MISMATCH);
851                                         goto f_err;
852                                         }
853                                 /* else cookie verification succeeded */
854                                 }
855                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
856                                                   s->d1->cookie_len) != 0) /* default verification */
857                                 {
858                                         al=SSL_AD_HANDSHAKE_FAILURE;
859                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
860                                                 SSL_R_COOKIE_MISMATCH);
861                                         goto f_err;
862                                 }
863                         }
864
865                 p += cookie_len;
866                 }
867
868         n2s(p,i);
869         if ((i == 0) && (j != 0))
870                 {
871                 /* we need a cipher if we are not resuming a session */
872                 al=SSL_AD_ILLEGAL_PARAMETER;
873                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
874                 goto f_err;
875                 }
876         if ((p+i) >= (d+n))
877                 {
878                 /* not enough data */
879                 al=SSL_AD_DECODE_ERROR;
880                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
881                 goto f_err;
882                 }
883         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
884                 == NULL))
885                 {
886                 goto err;
887                 }
888         p+=i;
889
890         /* If it is a hit, check that the cipher is in the list */
891         if ((s->hit) && (i > 0))
892                 {
893                 j=0;
894                 id=s->session->cipher->id;
895
896 #ifdef CIPHER_DEBUG
897                 printf("client sent %d ciphers\n",sk_num(ciphers));
898 #endif
899                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
900                         {
901                         c=sk_SSL_CIPHER_value(ciphers,i);
902 #ifdef CIPHER_DEBUG
903                         printf("client [%2d of %2d]:%s\n",
904                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
905 #endif
906                         if (c->id == id)
907                                 {
908                                 j=1;
909                                 break;
910                                 }
911                         }
912                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
913                         {
914                         /* Special case as client bug workaround: the previously used cipher may
915                          * not be in the current list, the client instead might be trying to
916                          * continue using a cipher that before wasn't chosen due to server
917                          * preferences.  We'll have to reject the connection if the cipher is not
918                          * enabled, though. */
919                         c = sk_SSL_CIPHER_value(ciphers, 0);
920                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
921                                 {
922                                 s->session->cipher = c;
923                                 j = 1;
924                                 }
925                         }
926                 if (j == 0)
927                         {
928                         /* we need to have the cipher in the cipher
929                          * list if we are asked to reuse it */
930                         al=SSL_AD_ILLEGAL_PARAMETER;
931                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
932                         goto f_err;
933                         }
934                 }
935
936         /* compression */
937         i= *(p++);
938         if ((p+i) > (d+n))
939                 {
940                 /* not enough data */
941                 al=SSL_AD_DECODE_ERROR;
942                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
943                 goto f_err;
944                 }
945         q=p;
946         for (j=0; j<i; j++)
947                 {
948                 if (p[j] == 0) break;
949                 }
950
951         p+=i;
952         if (j >= i)
953                 {
954                 /* no compress */
955                 al=SSL_AD_DECODE_ERROR;
956                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
957                 goto f_err;
958                 }
959
960 #ifndef OPENSSL_NO_TLSEXT
961         /* TLS extensions*/
962         if (s->version > SSL3_VERSION)
963                 {
964                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
965                         {
966                         /* 'al' set by ssl_parse_clienthello_tlsext */
967                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
968                         goto f_err;
969                         }
970                 }
971                 if (ssl_check_clienthello_tlsext(s) <= 0) {
972                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
973                         goto err;
974                 }
975 #endif
976         /* Worst case, we will use the NULL compression, but if we have other
977          * options, we will now look for them.  We have i-1 compression
978          * algorithms from the client, starting at q. */
979         s->s3->tmp.new_compression=NULL;
980 #ifndef OPENSSL_NO_COMP
981         if (s->ctx->comp_methods != NULL)
982                 { /* See if we have a match */
983                 int m,nn,o,v,done=0;
984
985                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
986                 for (m=0; m<nn; m++)
987                         {
988                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
989                         v=comp->id;
990                         for (o=0; o<i; o++)
991                                 {
992                                 if (v == q[o])
993                                         {
994                                         done=1;
995                                         break;
996                                         }
997                                 }
998                         if (done) break;
999                         }
1000                 if (done)
1001                         s->s3->tmp.new_compression=comp;
1002                 else
1003                         comp=NULL;
1004                 }
1005 #endif
1006
1007         /* TLS does not mind if there is extra stuff */
1008 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
1009          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
1010          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
1011         if (s->version == SSL3_VERSION)
1012                 {
1013                 if (p < (d+n))
1014                         {
1015                         /* wrong number of bytes,
1016                          * there could be more to follow */
1017                         al=SSL_AD_DECODE_ERROR;
1018                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1019                         goto f_err;
1020                         }
1021                 }
1022 #endif
1023
1024         /* Given s->session->ciphers and SSL_get_ciphers, we must
1025          * pick a cipher */
1026
1027         if (!s->hit)
1028                 {
1029 #ifdef OPENSSL_NO_COMP
1030                 s->session->compress_meth=0;
1031 #else
1032                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1033 #endif
1034                 if (s->session->ciphers != NULL)
1035                         sk_SSL_CIPHER_free(s->session->ciphers);
1036                 s->session->ciphers=ciphers;
1037                 if (ciphers == NULL)
1038                         {
1039                         al=SSL_AD_ILLEGAL_PARAMETER;
1040                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1041                         goto f_err;
1042                         }
1043                 ciphers=NULL;
1044                 c=ssl3_choose_cipher(s,s->session->ciphers,
1045                                      SSL_get_ciphers(s));
1046
1047                 if (c == NULL)
1048                         {
1049                         al=SSL_AD_HANDSHAKE_FAILURE;
1050                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1051                         goto f_err;
1052                         }
1053                 s->s3->tmp.new_cipher=c;
1054                 }
1055         else
1056                 {
1057                 /* Session-id reuse */
1058 #ifdef REUSE_CIPHER_BUG
1059                 STACK_OF(SSL_CIPHER) *sk;
1060                 SSL_CIPHER *nc=NULL;
1061                 SSL_CIPHER *ec=NULL;
1062
1063                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1064                         {
1065                         sk=s->session->ciphers;
1066                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1067                                 {
1068                                 c=sk_SSL_CIPHER_value(sk,i);
1069                                 if (c->algorithms & SSL_eNULL)
1070                                         nc=c;
1071                                 if (SSL_C_IS_EXPORT(c))
1072                                         ec=c;
1073                                 }
1074                         if (nc != NULL)
1075                                 s->s3->tmp.new_cipher=nc;
1076                         else if (ec != NULL)
1077                                 s->s3->tmp.new_cipher=ec;
1078                         else
1079                                 s->s3->tmp.new_cipher=s->session->cipher;
1080                         }
1081                 else
1082 #endif
1083                 s->s3->tmp.new_cipher=s->session->cipher;
1084                 }
1085         
1086         /* we now have the following setup. 
1087          * client_random
1088          * cipher_list          - our prefered list of ciphers
1089          * ciphers              - the clients prefered list of ciphers
1090          * compression          - basically ignored right now
1091          * ssl version is set   - sslv3
1092          * s->session           - The ssl session has been setup.
1093          * s->hit               - session reuse flag
1094          * s->tmp.new_cipher    - the new cipher to use.
1095          */
1096
1097         ret=1;
1098         if (0)
1099                 {
1100 f_err:
1101                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1102                 }
1103 err:
1104         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1105         return(ret);
1106         }
1107
1108 int ssl3_send_server_hello(SSL *s)
1109         {
1110         unsigned char *buf;
1111         unsigned char *p,*d;
1112         int i,sl;
1113         unsigned long l,Time;
1114
1115         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1116                 {
1117                 buf=(unsigned char *)s->init_buf->data;
1118                 p=s->s3->server_random;
1119                 Time=(unsigned long)time(NULL);                 /* Time */
1120                 l2n(Time,p);
1121                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1122                         return -1;
1123                 /* Do the message type and length last */
1124                 d=p= &(buf[4]);
1125
1126                 *(p++)=s->version>>8;
1127                 *(p++)=s->version&0xff;
1128
1129                 /* Random stuff */
1130                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1131                 p+=SSL3_RANDOM_SIZE;
1132
1133                 /* now in theory we have 3 options to sending back the
1134                  * session id.  If it is a re-use, we send back the
1135                  * old session-id, if it is a new session, we send
1136                  * back the new session-id or we send back a 0 length
1137                  * session-id if we want it to be single use.
1138                  * Currently I will not implement the '0' length session-id
1139                  * 12-Jan-98 - I'll now support the '0' length stuff.
1140                  *
1141                  * We also have an additional case where stateless session
1142                  * resumption is successful: we always send back the old
1143                  * session id. In this case s->hit is non zero: this can
1144                  * only happen if stateless session resumption is succesful
1145                  * if session caching is disabled so existing functionality
1146                  * is unaffected.
1147                  */
1148                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1149                         && !s->hit)
1150                         s->session->session_id_length=0;
1151
1152                 sl=s->session->session_id_length;
1153                 if (sl > (int)sizeof(s->session->session_id))
1154                         {
1155                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1156                         return -1;
1157                         }
1158                 *(p++)=sl;
1159                 memcpy(p,s->session->session_id,sl);
1160                 p+=sl;
1161
1162                 /* put the cipher */
1163                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1164                 p+=i;
1165
1166                 /* put the compression method */
1167 #ifdef OPENSSL_NO_COMP
1168                         *(p++)=0;
1169 #else
1170                 if (s->s3->tmp.new_compression == NULL)
1171                         *(p++)=0;
1172                 else
1173                         *(p++)=s->s3->tmp.new_compression->id;
1174 #endif
1175 #ifndef OPENSSL_NO_TLSEXT
1176                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1177                         {
1178                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1179                         return -1;
1180                         }
1181 #endif
1182                 /* do the header */
1183                 l=(p-d);
1184                 d=buf;
1185                 *(d++)=SSL3_MT_SERVER_HELLO;
1186                 l2n3(l,d);
1187
1188                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1189                 /* number of bytes to write */
1190                 s->init_num=p-buf;
1191                 s->init_off=0;
1192                 }
1193
1194         /* SSL3_ST_SW_SRVR_HELLO_B */
1195         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1196         }
1197
1198 int ssl3_send_server_done(SSL *s)
1199         {
1200         unsigned char *p;
1201
1202         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1203                 {
1204                 p=(unsigned char *)s->init_buf->data;
1205
1206                 /* do the header */
1207                 *(p++)=SSL3_MT_SERVER_DONE;
1208                 *(p++)=0;
1209                 *(p++)=0;
1210                 *(p++)=0;
1211
1212                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1213                 /* number of bytes to write */
1214                 s->init_num=4;
1215                 s->init_off=0;
1216                 }
1217
1218         /* SSL3_ST_SW_SRVR_DONE_B */
1219         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1220         }
1221
1222 int ssl3_send_server_key_exchange(SSL *s)
1223         {
1224 #ifndef OPENSSL_NO_RSA
1225         unsigned char *q;
1226         int j,num;
1227         RSA *rsa;
1228         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1229         unsigned int u;
1230 #endif
1231 #ifndef OPENSSL_NO_DH
1232         DH *dh=NULL,*dhp;
1233 #endif
1234 #ifndef OPENSSL_NO_ECDH
1235         EC_KEY *ecdh=NULL, *ecdhp;
1236         unsigned char *encodedPoint = NULL;
1237         int encodedlen = 0;
1238         int curve_id = 0;
1239         BN_CTX *bn_ctx = NULL; 
1240 #endif
1241         EVP_PKEY *pkey;
1242         unsigned char *p,*d;
1243         int al,i;
1244         unsigned long type;
1245         int n;
1246         CERT *cert;
1247         BIGNUM *r[4];
1248         int nr[4],kn;
1249         BUF_MEM *buf;
1250         EVP_MD_CTX md_ctx;
1251
1252         EVP_MD_CTX_init(&md_ctx);
1253         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1254                 {
1255                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1256                 cert=s->cert;
1257
1258                 buf=s->init_buf;
1259
1260                 r[0]=r[1]=r[2]=r[3]=NULL;
1261                 n=0;
1262 #ifndef OPENSSL_NO_RSA
1263                 if (type & SSL_kRSA)
1264                         {
1265                         rsa=cert->rsa_tmp;
1266                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1267                                 {
1268                                 rsa=s->cert->rsa_tmp_cb(s,
1269                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1270                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1271                                 if(rsa == NULL)
1272                                 {
1273                                         al=SSL_AD_HANDSHAKE_FAILURE;
1274                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1275                                         goto f_err;
1276                                 }
1277                                 RSA_up_ref(rsa);
1278                                 cert->rsa_tmp=rsa;
1279                                 }
1280                         if (rsa == NULL)
1281                                 {
1282                                 al=SSL_AD_HANDSHAKE_FAILURE;
1283                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1284                                 goto f_err;
1285                                 }
1286                         r[0]=rsa->n;
1287                         r[1]=rsa->e;
1288                         s->s3->tmp.use_rsa_tmp=1;
1289                         }
1290                 else
1291 #endif
1292 #ifndef OPENSSL_NO_DH
1293                         if (type & SSL_kEDH)
1294                         {
1295                         dhp=cert->dh_tmp;
1296                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1297                                 dhp=s->cert->dh_tmp_cb(s,
1298                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1299                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1300                         if (dhp == NULL)
1301                                 {
1302                                 al=SSL_AD_HANDSHAKE_FAILURE;
1303                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1304                                 goto f_err;
1305                                 }
1306
1307                         if (s->s3->tmp.dh != NULL)
1308                                 {
1309                                 DH_free(dh);
1310                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1311                                 goto err;
1312                                 }
1313
1314                         if ((dh=DHparams_dup(dhp)) == NULL)
1315                                 {
1316                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1317                                 goto err;
1318                                 }
1319
1320                         s->s3->tmp.dh=dh;
1321                         if ((dhp->pub_key == NULL ||
1322                              dhp->priv_key == NULL ||
1323                              (s->options & SSL_OP_SINGLE_DH_USE)))
1324                                 {
1325                                 if(!DH_generate_key(dh))
1326                                     {
1327                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1328                                            ERR_R_DH_LIB);
1329                                     goto err;
1330                                     }
1331                                 }
1332                         else
1333                                 {
1334                                 dh->pub_key=BN_dup(dhp->pub_key);
1335                                 dh->priv_key=BN_dup(dhp->priv_key);
1336                                 if ((dh->pub_key == NULL) ||
1337                                         (dh->priv_key == NULL))
1338                                         {
1339                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1340                                         goto err;
1341                                         }
1342                                 }
1343                         r[0]=dh->p;
1344                         r[1]=dh->g;
1345                         r[2]=dh->pub_key;
1346                         }
1347                 else 
1348 #endif
1349 #ifndef OPENSSL_NO_ECDH
1350                         if (type & SSL_kECDHE)
1351                         {
1352                         const EC_GROUP *group;
1353
1354                         ecdhp=cert->ecdh_tmp;
1355                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1356                                 {
1357                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1358                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1359                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1360                                 }
1361                         if (ecdhp == NULL)
1362                                 {
1363                                 al=SSL_AD_HANDSHAKE_FAILURE;
1364                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1365                                 goto f_err;
1366                                 }
1367
1368                         if (s->s3->tmp.ecdh != NULL)
1369                                 {
1370                                 EC_KEY_free(s->s3->tmp.ecdh); 
1371                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1372                                 goto err;
1373                                 }
1374
1375                         /* Duplicate the ECDH structure. */
1376                         if (ecdhp == NULL)
1377                                 {
1378                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1379                                 goto err;
1380                                 }
1381                         if (!EC_KEY_up_ref(ecdhp))
1382                                 {
1383                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1384                                 goto err;
1385                                 }
1386                         ecdh = ecdhp;
1387
1388                         s->s3->tmp.ecdh=ecdh;
1389                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1390                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1391                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1392                                 {
1393                                 if(!EC_KEY_generate_key(ecdh))
1394                                     {
1395                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1396                                     goto err;
1397                                     }
1398                                 }
1399
1400                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1401                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1402                             (EC_KEY_get0_private_key(ecdh) == NULL))
1403                                 {
1404                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1405                                 goto err;
1406                                 }
1407
1408                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1409                             (EC_GROUP_get_degree(group) > 163)) 
1410                                 {
1411                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1412                                 goto err;
1413                                 }
1414
1415                         /* XXX: For now, we only support ephemeral ECDH
1416                          * keys over named (not generic) curves. For 
1417                          * supported named curves, curve_id is non-zero.
1418                          */
1419                         if ((curve_id = 
1420                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1421                             == 0)
1422                                 {
1423                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1424                                 goto err;
1425                                 }
1426
1427                         /* Encode the public key.
1428                          * First check the size of encoding and
1429                          * allocate memory accordingly.
1430                          */
1431                         encodedlen = EC_POINT_point2oct(group, 
1432                             EC_KEY_get0_public_key(ecdh),
1433                             POINT_CONVERSION_UNCOMPRESSED, 
1434                             NULL, 0, NULL);
1435
1436                         encodedPoint = (unsigned char *) 
1437                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1438                         bn_ctx = BN_CTX_new();
1439                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1440                                 {
1441                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1442                                 goto err;
1443                                 }
1444
1445
1446                         encodedlen = EC_POINT_point2oct(group, 
1447                             EC_KEY_get0_public_key(ecdh), 
1448                             POINT_CONVERSION_UNCOMPRESSED, 
1449                             encodedPoint, encodedlen, bn_ctx);
1450
1451                         if (encodedlen == 0) 
1452                                 {
1453                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1454                                 goto err;
1455                                 }
1456
1457                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1458
1459                         /* XXX: For now, we only support named (not 
1460                          * generic) curves in ECDH ephemeral key exchanges.
1461                          * In this situation, we need four additional bytes
1462                          * to encode the entire ServerECDHParams
1463                          * structure. 
1464                          */
1465                         n = 4 + encodedlen;
1466
1467                         /* We'll generate the serverKeyExchange message
1468                          * explicitly so we can set these to NULLs
1469                          */
1470                         r[0]=NULL;
1471                         r[1]=NULL;
1472                         r[2]=NULL;
1473                         r[3]=NULL;
1474                         }
1475                 else 
1476 #endif /* !OPENSSL_NO_ECDH */
1477                         {
1478                         al=SSL_AD_HANDSHAKE_FAILURE;
1479                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1480                         goto f_err;
1481                         }
1482                 for (i=0; r[i] != NULL; i++)
1483                         {
1484                         nr[i]=BN_num_bytes(r[i]);
1485                         n+=2+nr[i];
1486                         }
1487
1488                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1489                         {
1490                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1491                                 == NULL)
1492                                 {
1493                                 al=SSL_AD_DECODE_ERROR;
1494                                 goto f_err;
1495                                 }
1496                         kn=EVP_PKEY_size(pkey);
1497                         }
1498                 else
1499                         {
1500                         pkey=NULL;
1501                         kn=0;
1502                         }
1503
1504                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1505                         {
1506                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1507                         goto err;
1508                         }
1509                 d=(unsigned char *)s->init_buf->data;
1510                 p= &(d[4]);
1511
1512                 for (i=0; r[i] != NULL; i++)
1513                         {
1514                         s2n(nr[i],p);
1515                         BN_bn2bin(r[i],p);
1516                         p+=nr[i];
1517                         }
1518
1519 #ifndef OPENSSL_NO_ECDH
1520                 if (type & SSL_kECDHE) 
1521                         {
1522                         /* XXX: For now, we only support named (not generic) curves.
1523                          * In this situation, the serverKeyExchange message has:
1524                          * [1 byte CurveType], [2 byte CurveName]
1525                          * [1 byte length of encoded point], followed by
1526                          * the actual encoded point itself
1527                          */
1528                         *p = NAMED_CURVE_TYPE;
1529                         p += 1;
1530                         *p = 0;
1531                         p += 1;
1532                         *p = curve_id;
1533                         p += 1;
1534                         *p = encodedlen;
1535                         p += 1;
1536                         memcpy((unsigned char*)p, 
1537                             (unsigned char *)encodedPoint, 
1538                             encodedlen);
1539                         OPENSSL_free(encodedPoint);
1540                         p += encodedlen;
1541                         }
1542 #endif
1543
1544                 /* not anonymous */
1545                 if (pkey != NULL)
1546                         {
1547                         /* n is the length of the params, they start at &(d[4])
1548                          * and p points to the space at the end. */
1549 #ifndef OPENSSL_NO_RSA
1550                         if (pkey->type == EVP_PKEY_RSA)
1551                                 {
1552                                 q=md_buf;
1553                                 j=0;
1554                                 for (num=2; num > 0; num--)
1555                                         {
1556                                         EVP_MD_CTX_set_flags(&md_ctx,
1557                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1558                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1559                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1560                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1561                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1562                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1563                                         EVP_DigestFinal_ex(&md_ctx,q,
1564                                                 (unsigned int *)&i);
1565                                         q+=i;
1566                                         j+=i;
1567                                         }
1568                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1569                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1570                                         {
1571                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1572                                         goto err;
1573                                         }
1574                                 s2n(u,p);
1575                                 n+=u+2;
1576                                 }
1577                         else
1578 #endif
1579 #if !defined(OPENSSL_NO_DSA)
1580                                 if (pkey->type == EVP_PKEY_DSA)
1581                                 {
1582                                 /* lets do DSS */
1583                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1584                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1585                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1586                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1587                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1588                                         (unsigned int *)&i,pkey))
1589                                         {
1590                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1591                                         goto err;
1592                                         }
1593                                 s2n(i,p);
1594                                 n+=i+2;
1595                                 }
1596                         else
1597 #endif
1598 #if !defined(OPENSSL_NO_ECDSA)
1599                                 if (pkey->type == EVP_PKEY_EC)
1600                                 {
1601                                 /* let's do ECDSA */
1602                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1603                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1604                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1605                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1606                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1607                                         (unsigned int *)&i,pkey))
1608                                         {
1609                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1610                                         goto err;
1611                                         }
1612                                 s2n(i,p);
1613                                 n+=i+2;
1614                                 }
1615                         else
1616 #endif
1617                                 {
1618                                 /* Is this error check actually needed? */
1619                                 al=SSL_AD_HANDSHAKE_FAILURE;
1620                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1621                                 goto f_err;
1622                                 }
1623                         }
1624
1625                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1626                 l2n3(n,d);
1627
1628                 /* we should now have things packed up, so lets send
1629                  * it off */
1630                 s->init_num=n+4;
1631                 s->init_off=0;
1632                 }
1633
1634         s->state = SSL3_ST_SW_KEY_EXCH_B;
1635         EVP_MD_CTX_cleanup(&md_ctx);
1636         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1637 f_err:
1638         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1639 err:
1640 #ifndef OPENSSL_NO_ECDH
1641         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1642         BN_CTX_free(bn_ctx);
1643 #endif
1644         EVP_MD_CTX_cleanup(&md_ctx);
1645         return(-1);
1646         }
1647
1648 int ssl3_send_certificate_request(SSL *s)
1649         {
1650         unsigned char *p,*d;
1651         int i,j,nl,off,n;
1652         STACK_OF(X509_NAME) *sk=NULL;
1653         X509_NAME *name;
1654         BUF_MEM *buf;
1655
1656         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1657                 {
1658                 buf=s->init_buf;
1659
1660                 d=p=(unsigned char *)&(buf->data[4]);
1661
1662                 /* get the list of acceptable cert types */
1663                 p++;
1664                 n=ssl3_get_req_cert_type(s,p);
1665                 d[0]=n;
1666                 p+=n;
1667                 n++;
1668
1669                 off=n;
1670                 p+=2;
1671                 n+=2;
1672
1673                 sk=SSL_get_client_CA_list(s);
1674                 nl=0;
1675                 if (sk != NULL)
1676                         {
1677                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1678                                 {
1679                                 name=sk_X509_NAME_value(sk,i);
1680                                 j=i2d_X509_NAME(name,NULL);
1681                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1682                                         {
1683                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1684                                         goto err;
1685                                         }
1686                                 p=(unsigned char *)&(buf->data[4+n]);
1687                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1688                                         {
1689                                         s2n(j,p);
1690                                         i2d_X509_NAME(name,&p);
1691                                         n+=2+j;
1692                                         nl+=2+j;
1693                                         }
1694                                 else
1695                                         {
1696                                         d=p;
1697                                         i2d_X509_NAME(name,&p);
1698                                         j-=2; s2n(j,d); j+=2;
1699                                         n+=j;
1700                                         nl+=j;
1701                                         }
1702                                 }
1703                         }
1704                 /* else no CA names */
1705                 p=(unsigned char *)&(buf->data[4+off]);
1706                 s2n(nl,p);
1707
1708                 d=(unsigned char *)buf->data;
1709                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1710                 l2n3(n,d);
1711
1712                 /* we should now have things packed up, so lets send
1713                  * it off */
1714
1715                 s->init_num=n+4;
1716                 s->init_off=0;
1717 #ifdef NETSCAPE_HANG_BUG
1718                 p=(unsigned char *)s->init_buf->data + s->init_num;
1719
1720                 /* do the header */
1721                 *(p++)=SSL3_MT_SERVER_DONE;
1722                 *(p++)=0;
1723                 *(p++)=0;
1724                 *(p++)=0;
1725                 s->init_num += 4;
1726 #endif
1727
1728                 s->state = SSL3_ST_SW_CERT_REQ_B;
1729                 }
1730
1731         /* SSL3_ST_SW_CERT_REQ_B */
1732         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1733 err:
1734         return(-1);
1735         }
1736
1737 int ssl3_get_client_key_exchange(SSL *s)
1738         {
1739         int i,al,ok;
1740         long n;
1741         unsigned long l;
1742         unsigned char *p;
1743 #ifndef OPENSSL_NO_RSA
1744         RSA *rsa=NULL;
1745         EVP_PKEY *pkey=NULL;
1746 #endif
1747 #ifndef OPENSSL_NO_DH
1748         BIGNUM *pub=NULL;
1749         DH *dh_srvr;
1750 #endif
1751 #ifndef OPENSSL_NO_KRB5
1752         KSSL_ERR kssl_err;
1753 #endif /* OPENSSL_NO_KRB5 */
1754
1755 #ifndef OPENSSL_NO_ECDH
1756         EC_KEY *srvr_ecdh = NULL;
1757         EVP_PKEY *clnt_pub_pkey = NULL;
1758         EC_POINT *clnt_ecpoint = NULL;
1759         BN_CTX *bn_ctx = NULL; 
1760 #endif
1761
1762         n=s->method->ssl_get_message(s,
1763                 SSL3_ST_SR_KEY_EXCH_A,
1764                 SSL3_ST_SR_KEY_EXCH_B,
1765                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1766                 2048, /* ??? */
1767                 &ok);
1768
1769         if (!ok) return((int)n);
1770         p=(unsigned char *)s->init_msg;
1771
1772         l=s->s3->tmp.new_cipher->algorithms;
1773
1774 #ifndef OPENSSL_NO_RSA
1775         if (l & SSL_kRSA)
1776                 {
1777                 /* FIX THIS UP EAY EAY EAY EAY */
1778                 if (s->s3->tmp.use_rsa_tmp)
1779                         {
1780                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1781                                 rsa=s->cert->rsa_tmp;
1782                         /* Don't do a callback because rsa_tmp should
1783                          * be sent already */
1784                         if (rsa == NULL)
1785                                 {
1786                                 al=SSL_AD_HANDSHAKE_FAILURE;
1787                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1788                                 goto f_err;
1789
1790                                 }
1791                         }
1792                 else
1793                         {
1794                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1795                         if (    (pkey == NULL) ||
1796                                 (pkey->type != EVP_PKEY_RSA) ||
1797                                 (pkey->pkey.rsa == NULL))
1798                                 {
1799                                 al=SSL_AD_HANDSHAKE_FAILURE;
1800                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1801                                 goto f_err;
1802                                 }
1803                         rsa=pkey->pkey.rsa;
1804                         }
1805
1806                 /* TLS and [incidentally] DTLS, including pre-0.9.8f */
1807                 if (s->version > SSL3_VERSION &&
1808                     s->client_version != DTLS1_BAD_VER)
1809                         {
1810                         n2s(p,i);
1811                         if (n != i+2)
1812                                 {
1813                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1814                                         {
1815                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1816                                         goto err;
1817                                         }
1818                                 else
1819                                         p-=2;
1820                                 }
1821                         else
1822                                 n=i;
1823                         }
1824
1825                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1826
1827                 al = -1;
1828                 
1829                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1830                         {
1831                         al=SSL_AD_DECODE_ERROR;
1832                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1833                         }
1834
1835                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1836                         {
1837                         /* The premaster secret must contain the same version number as the
1838                          * ClientHello to detect version rollback attacks (strangely, the
1839                          * protocol does not offer such protection for DH ciphersuites).
1840                          * However, buggy clients exist that send the negotiated protocol
1841                          * version instead if the server does not support the requested
1842                          * protocol version.
1843                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1844                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1845                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1846                                 {
1847                                 al=SSL_AD_DECODE_ERROR;
1848                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1849
1850                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1851                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1852                                  * number check as a "bad version oracle" -- an alert would
1853                                  * reveal that the plaintext corresponding to some ciphertext
1854                                  * made up by the adversary is properly formatted except
1855                                  * that the version number is wrong.  To avoid such attacks,
1856                                  * we should treat this just like any other decryption error. */
1857                                 }
1858                         }
1859
1860                 if (al != -1)
1861                         {
1862                         /* Some decryption failure -- use random value instead as countermeasure
1863                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1864                          * (see RFC 2246, section 7.4.7.1). */
1865                         ERR_clear_error();
1866                         i = SSL_MAX_MASTER_KEY_LENGTH;
1867                         p[0] = s->client_version >> 8;
1868                         p[1] = s->client_version & 0xff;
1869                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1870                                 goto err;
1871                         }
1872         
1873                 s->session->master_key_length=
1874                         s->method->ssl3_enc->generate_master_secret(s,
1875                                 s->session->master_key,
1876                                 p,i);
1877                 OPENSSL_cleanse(p,i);
1878                 }
1879         else
1880 #endif
1881 #ifndef OPENSSL_NO_DH
1882                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1883                 {
1884                 n2s(p,i);
1885                 if (n != i+2)
1886                         {
1887                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1888                                 {
1889                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1890                                 goto err;
1891                                 }
1892                         else
1893                                 {
1894                                 p-=2;
1895                                 i=(int)n;
1896                                 }
1897                         }
1898
1899                 if (n == 0L) /* the parameters are in the cert */
1900                         {
1901                         al=SSL_AD_HANDSHAKE_FAILURE;
1902                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1903                         goto f_err;
1904                         }
1905                 else
1906                         {
1907                         if (s->s3->tmp.dh == NULL)
1908                                 {
1909                                 al=SSL_AD_HANDSHAKE_FAILURE;
1910                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1911                                 goto f_err;
1912                                 }
1913                         else
1914                                 dh_srvr=s->s3->tmp.dh;
1915                         }
1916
1917                 pub=BN_bin2bn(p,i,NULL);
1918                 if (pub == NULL)
1919                         {
1920                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1921                         goto err;
1922                         }
1923
1924                 i=DH_compute_key(p,pub,dh_srvr);
1925
1926                 if (i <= 0)
1927                         {
1928                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1929                         goto err;
1930                         }
1931
1932                 DH_free(s->s3->tmp.dh);
1933                 s->s3->tmp.dh=NULL;
1934
1935                 BN_clear_free(pub);
1936                 pub=NULL;
1937                 s->session->master_key_length=
1938                         s->method->ssl3_enc->generate_master_secret(s,
1939                                 s->session->master_key,p,i);
1940                 OPENSSL_cleanse(p,i);
1941                 }
1942         else
1943 #endif
1944 #ifndef OPENSSL_NO_KRB5
1945         if (l & SSL_kKRB5)
1946                 {
1947                 krb5_error_code         krb5rc;
1948                 krb5_data               enc_ticket;
1949                 krb5_data               authenticator;
1950                 krb5_data               enc_pms;
1951                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1952                 EVP_CIPHER_CTX          ciph_ctx;
1953                 EVP_CIPHER              *enc = NULL;
1954                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1955                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1956                                                + EVP_MAX_BLOCK_LENGTH];
1957                 int                     padl, outl;
1958                 krb5_timestamp          authtime = 0;
1959                 krb5_ticket_times       ttimes;
1960
1961                 EVP_CIPHER_CTX_init(&ciph_ctx);
1962
1963                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1964
1965                 n2s(p,i);
1966                 enc_ticket.length = i;
1967
1968                 if (n < (int)enc_ticket.length + 6)
1969                         {
1970                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1971                                 SSL_R_DATA_LENGTH_TOO_LONG);
1972                         goto err;
1973                         }
1974
1975                 enc_ticket.data = (char *)p;
1976                 p+=enc_ticket.length;
1977
1978                 n2s(p,i);
1979                 authenticator.length = i;
1980
1981                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
1982                         {
1983                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1984                                 SSL_R_DATA_LENGTH_TOO_LONG);
1985                         goto err;
1986                         }
1987
1988                 authenticator.data = (char *)p;
1989                 p+=authenticator.length;
1990
1991                 n2s(p,i);
1992                 enc_pms.length = i;
1993                 enc_pms.data = (char *)p;
1994                 p+=enc_pms.length;
1995
1996                 /* Note that the length is checked again below,
1997                 ** after decryption
1998                 */
1999                 if(enc_pms.length > sizeof pms)
2000                         {
2001                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2002                                SSL_R_DATA_LENGTH_TOO_LONG);
2003                         goto err;
2004                         }
2005
2006                 if (n != (long)(enc_ticket.length + authenticator.length +
2007                                                 enc_pms.length + 6))
2008                         {
2009                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2010                                 SSL_R_DATA_LENGTH_TOO_LONG);
2011                         goto err;
2012                         }
2013
2014                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2015                                         &kssl_err)) != 0)
2016                         {
2017 #ifdef KSSL_DEBUG
2018                         printf("kssl_sget_tkt rtn %d [%d]\n",
2019                                 krb5rc, kssl_err.reason);
2020                         if (kssl_err.text)
2021                                 printf("kssl_err text= %s\n", kssl_err.text);
2022 #endif  /* KSSL_DEBUG */
2023                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2024                                 kssl_err.reason);
2025                         goto err;
2026                         }
2027
2028                 /*  Note: no authenticator is not considered an error,
2029                 **  but will return authtime == 0.
2030                 */
2031                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2032                                         &authtime, &kssl_err)) != 0)
2033                         {
2034 #ifdef KSSL_DEBUG
2035                         printf("kssl_check_authent rtn %d [%d]\n",
2036                                 krb5rc, kssl_err.reason);
2037                         if (kssl_err.text)
2038                                 printf("kssl_err text= %s\n", kssl_err.text);
2039 #endif  /* KSSL_DEBUG */
2040                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2041                                 kssl_err.reason);
2042                         goto err;
2043                         }
2044
2045                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2046                         {
2047                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2048                         goto err;
2049                         }
2050
2051 #ifdef KSSL_DEBUG
2052                 kssl_ctx_show(kssl_ctx);
2053 #endif  /* KSSL_DEBUG */
2054
2055                 enc = kssl_map_enc(kssl_ctx->enctype);
2056                 if (enc == NULL)
2057                     goto err;
2058
2059                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2060
2061                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2062                         {
2063                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2064                                 SSL_R_DECRYPTION_FAILED);
2065                         goto err;
2066                         }
2067                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2068                                         (unsigned char *)enc_pms.data, enc_pms.length))
2069                         {
2070                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2071                                 SSL_R_DECRYPTION_FAILED);
2072                         goto err;
2073                         }
2074                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2075                         {
2076                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2077                                 SSL_R_DATA_LENGTH_TOO_LONG);
2078                         goto err;
2079                         }
2080                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2081                         {
2082                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2083                                 SSL_R_DECRYPTION_FAILED);
2084                         goto err;
2085                         }
2086                 outl += padl;
2087                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2088                         {
2089                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2090                                 SSL_R_DATA_LENGTH_TOO_LONG);
2091                         goto err;
2092                         }
2093                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2094                     {
2095                     /* The premaster secret must contain the same version number as the
2096                      * ClientHello to detect version rollback attacks (strangely, the
2097                      * protocol does not offer such protection for DH ciphersuites).
2098                      * However, buggy clients exist that send random bytes instead of
2099                      * the protocol version.
2100                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2101                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2102                      */
2103                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2104                         {
2105                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2106                                SSL_AD_DECODE_ERROR);
2107                         goto err;
2108                         }
2109                     }
2110
2111                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2112
2113                 s->session->master_key_length=
2114                         s->method->ssl3_enc->generate_master_secret(s,
2115                                 s->session->master_key, pms, outl);
2116
2117                 if (kssl_ctx->client_princ)
2118                         {
2119                         size_t len = strlen(kssl_ctx->client_princ);
2120                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2121                                 {
2122                                 s->session->krb5_client_princ_len = len;
2123                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2124                                 }
2125                         }
2126
2127
2128                 /*  Was doing kssl_ctx_free() here,
2129                 **  but it caused problems for apache.
2130                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2131                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2132                 */
2133                 }
2134         else
2135 #endif  /* OPENSSL_NO_KRB5 */
2136
2137 #ifndef OPENSSL_NO_ECDH
2138                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2139                 {
2140                 int ret = 1;
2141                 int field_size = 0;
2142                 const EC_KEY   *tkey;
2143                 const EC_GROUP *group;
2144                 const BIGNUM *priv_key;
2145
2146                 /* initialize structures for server's ECDH key pair */
2147                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2148                         {
2149                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2150                             ERR_R_MALLOC_FAILURE);
2151                         goto err;
2152                         }
2153
2154                 /* Let's get server private key and group information */
2155                 if (l & SSL_kECDH) 
2156                         { 
2157                         /* use the certificate */
2158                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2159                         }
2160                 else
2161                         {
2162                         /* use the ephermeral values we saved when
2163                          * generating the ServerKeyExchange msg.
2164                          */
2165                         tkey = s->s3->tmp.ecdh;
2166                         }
2167
2168                 group    = EC_KEY_get0_group(tkey);
2169                 priv_key = EC_KEY_get0_private_key(tkey);
2170
2171                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2172                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2173                         {
2174                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2175                                ERR_R_EC_LIB);
2176                         goto err;
2177                         }
2178
2179                 /* Let's get client's public key */
2180                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2181                         {
2182                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2183                             ERR_R_MALLOC_FAILURE);
2184                         goto err;
2185                         }
2186
2187                 if (n == 0L) 
2188                         {
2189                         /* Client Publickey was in Client Certificate */
2190
2191                          if (l & SSL_kECDHE) 
2192                                  {
2193                                  al=SSL_AD_HANDSHAKE_FAILURE;
2194                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2195                                  goto f_err;
2196                                  }
2197                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2198                             == NULL) || 
2199                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2200                                 {
2201                                 /* XXX: For now, we do not support client
2202                                  * authentication using ECDH certificates
2203                                  * so this branch (n == 0L) of the code is
2204                                  * never executed. When that support is
2205                                  * added, we ought to ensure the key 
2206                                  * received in the certificate is 
2207                                  * authorized for key agreement.
2208                                  * ECDH_compute_key implicitly checks that
2209                                  * the two ECDH shares are for the same
2210                                  * group.
2211                                  */
2212                                 al=SSL_AD_HANDSHAKE_FAILURE;
2213                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2214                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2215                                 goto f_err;
2216                                 }
2217
2218                         if (EC_POINT_copy(clnt_ecpoint,
2219                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2220                                 {
2221                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2222                                         ERR_R_EC_LIB);
2223                                 goto err;
2224                                 }
2225                         ret = 2; /* Skip certificate verify processing */
2226                         }
2227                 else
2228                         {
2229                         /* Get client's public key from encoded point
2230                          * in the ClientKeyExchange message.
2231                          */
2232                         if ((bn_ctx = BN_CTX_new()) == NULL)
2233                                 {
2234                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2235                                     ERR_R_MALLOC_FAILURE);
2236                                 goto err;
2237                                 }
2238
2239                         /* Get encoded point length */
2240                         i = *p; 
2241                         p += 1;
2242                         if (EC_POINT_oct2point(group, 
2243                             clnt_ecpoint, p, i, bn_ctx) == 0)
2244                                 {
2245                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2246                                     ERR_R_EC_LIB);
2247                                 goto err;
2248                                 }
2249                         /* p is pointing to somewhere in the buffer
2250                          * currently, so set it to the start 
2251                          */ 
2252                         p=(unsigned char *)s->init_buf->data;
2253                         }
2254
2255                 /* Compute the shared pre-master secret */
2256                 field_size = EC_GROUP_get_degree(group);
2257                 if (field_size <= 0)
2258                         {
2259                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2260                                ERR_R_ECDH_LIB);
2261                         goto err;
2262                         }
2263                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2264                 if (i <= 0)
2265                         {
2266                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2267                             ERR_R_ECDH_LIB);
2268                         goto err;
2269                         }
2270
2271                 EVP_PKEY_free(clnt_pub_pkey);
2272                 EC_POINT_free(clnt_ecpoint);
2273                 if (srvr_ecdh != NULL) 
2274                         EC_KEY_free(srvr_ecdh);
2275                 BN_CTX_free(bn_ctx);
2276
2277                 /* Compute the master secret */
2278                 s->session->master_key_length = s->method->ssl3_enc-> \
2279                     generate_master_secret(s, s->session->master_key, p, i);
2280                 
2281                 OPENSSL_cleanse(p, i);
2282                 return (ret);
2283                 }
2284         else
2285 #endif
2286                 {
2287                 al=SSL_AD_HANDSHAKE_FAILURE;
2288                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2289                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2290                 goto f_err;
2291                 }
2292
2293         return(1);
2294 f_err:
2295         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2296 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2297 err:
2298 #endif
2299 #ifndef OPENSSL_NO_ECDH
2300         EVP_PKEY_free(clnt_pub_pkey);
2301         EC_POINT_free(clnt_ecpoint);
2302         if (srvr_ecdh != NULL) 
2303                 EC_KEY_free(srvr_ecdh);
2304         BN_CTX_free(bn_ctx);
2305 #endif
2306         return(-1);
2307         }
2308
2309 int ssl3_get_cert_verify(SSL *s)
2310         {
2311         EVP_PKEY *pkey=NULL;
2312         unsigned char *p;
2313         int al,ok,ret=0;
2314         long n;
2315         int type=0,i,j;
2316         X509 *peer;
2317
2318         n=s->method->ssl_get_message(s,
2319                 SSL3_ST_SR_CERT_VRFY_A,
2320                 SSL3_ST_SR_CERT_VRFY_B,
2321                 -1,
2322                 514, /* 514? */
2323                 &ok);
2324
2325         if (!ok) return((int)n);
2326
2327         if (s->session->peer != NULL)
2328                 {
2329                 peer=s->session->peer;
2330                 pkey=X509_get_pubkey(peer);
2331                 type=X509_certificate_type(peer,pkey);
2332                 }
2333         else
2334                 {
2335                 peer=NULL;
2336                 pkey=NULL;
2337                 }
2338
2339         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2340                 {
2341                 s->s3->tmp.reuse_message=1;
2342                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2343                         {
2344                         al=SSL_AD_UNEXPECTED_MESSAGE;
2345                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2346                         goto f_err;
2347                         }
2348                 ret=1;
2349                 goto end;
2350                 }
2351
2352         if (peer == NULL)
2353                 {
2354                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2355                 al=SSL_AD_UNEXPECTED_MESSAGE;
2356                 goto f_err;
2357                 }
2358
2359         if (!(type & EVP_PKT_SIGN))
2360                 {
2361                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2362                 al=SSL_AD_ILLEGAL_PARAMETER;
2363                 goto f_err;
2364                 }
2365
2366         if (s->s3->change_cipher_spec)
2367                 {
2368                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2369                 al=SSL_AD_UNEXPECTED_MESSAGE;
2370                 goto f_err;
2371                 }
2372
2373         /* we now have a signature that we need to verify */
2374         p=(unsigned char *)s->init_msg;
2375         n2s(p,i);
2376         n-=2;
2377         if (i > n)
2378                 {
2379                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2380                 al=SSL_AD_DECODE_ERROR;
2381                 goto f_err;
2382                 }
2383
2384         j=EVP_PKEY_size(pkey);
2385         if ((i > j) || (n > j) || (n <= 0))
2386                 {
2387                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2388                 al=SSL_AD_DECODE_ERROR;
2389                 goto f_err;
2390                 }
2391
2392 #ifndef OPENSSL_NO_RSA 
2393         if (pkey->type == EVP_PKEY_RSA)
2394                 {
2395                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2396                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
2397                                                         pkey->pkey.rsa);
2398                 if (i < 0)
2399                         {
2400                         al=SSL_AD_DECRYPT_ERROR;
2401                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2402                         goto f_err;
2403                         }
2404                 if (i == 0)
2405                         {
2406                         al=SSL_AD_DECRYPT_ERROR;
2407                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2408                         goto f_err;
2409                         }
2410                 }
2411         else
2412 #endif
2413 #ifndef OPENSSL_NO_DSA
2414                 if (pkey->type == EVP_PKEY_DSA)
2415                 {
2416                 j=DSA_verify(pkey->save_type,
2417                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2418                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2419                 if (j <= 0)
2420                         {
2421                         /* bad signature */
2422                         al=SSL_AD_DECRYPT_ERROR;
2423                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2424                         goto f_err;
2425                         }
2426                 }
2427         else
2428 #endif
2429 #ifndef OPENSSL_NO_ECDSA
2430                 if (pkey->type == EVP_PKEY_EC)
2431                 {
2432                 j=ECDSA_verify(pkey->save_type,
2433                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2434                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2435                 if (j <= 0)
2436                         {
2437                         /* bad signature */
2438                         al=SSL_AD_DECRYPT_ERROR;
2439                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2440                             SSL_R_BAD_ECDSA_SIGNATURE);
2441                         goto f_err;
2442                         }
2443                 }
2444         else
2445 #endif
2446                 {
2447                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2448                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2449                 goto f_err;
2450                 }
2451
2452
2453         ret=1;
2454         if (0)
2455                 {
2456 f_err:
2457                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2458                 }
2459 end:
2460         EVP_PKEY_free(pkey);
2461         return(ret);
2462         }
2463
2464 int ssl3_get_client_certificate(SSL *s)
2465         {
2466         int i,ok,al,ret= -1;
2467         X509 *x=NULL;
2468         unsigned long l,nc,llen,n;
2469         const unsigned char *p,*q;
2470         unsigned char *d;
2471         STACK_OF(X509) *sk=NULL;
2472
2473         n=s->method->ssl_get_message(s,
2474                 SSL3_ST_SR_CERT_A,
2475                 SSL3_ST_SR_CERT_B,
2476                 -1,
2477                 s->max_cert_list,
2478                 &ok);
2479
2480         if (!ok) return((int)n);
2481
2482         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2483                 {
2484                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2485                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2486                         {
2487                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2488                         al=SSL_AD_HANDSHAKE_FAILURE;
2489                         goto f_err;
2490                         }
2491                 /* If tls asked for a client cert, the client must return a 0 list */
2492                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2493                         {
2494                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2495                         al=SSL_AD_UNEXPECTED_MESSAGE;
2496                         goto f_err;
2497                         }
2498                 s->s3->tmp.reuse_message=1;
2499                 return(1);
2500                 }
2501
2502         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2503                 {
2504                 al=SSL_AD_UNEXPECTED_MESSAGE;
2505                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2506                 goto f_err;
2507                 }
2508         p=d=(unsigned char *)s->init_msg;
2509
2510         if ((sk=sk_X509_new_null()) == NULL)
2511                 {
2512                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2513                 goto err;
2514                 }
2515
2516         n2l3(p,llen);
2517         if (llen+3 != n)
2518                 {
2519                 al=SSL_AD_DECODE_ERROR;
2520                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2521                 goto f_err;
2522                 }
2523         for (nc=0; nc<llen; )
2524                 {
2525                 n2l3(p,l);
2526                 if ((l+nc+3) > llen)
2527                         {
2528                         al=SSL_AD_DECODE_ERROR;
2529                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2530                         goto f_err;
2531                         }
2532
2533                 q=p;
2534                 x=d2i_X509(NULL,&p,l);
2535                 if (x == NULL)
2536                         {
2537                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2538                         goto err;
2539                         }
2540                 if (p != (q+l))
2541                         {
2542                         al=SSL_AD_DECODE_ERROR;
2543                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2544                         goto f_err;
2545                         }
2546                 if (!sk_X509_push(sk,x))
2547                         {
2548                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2549                         goto err;
2550                         }
2551                 x=NULL;
2552                 nc+=l+3;
2553                 }
2554
2555         if (sk_X509_num(sk) <= 0)
2556                 {
2557                 /* TLS does not mind 0 certs returned */
2558                 if (s->version == SSL3_VERSION)
2559                         {
2560                         al=SSL_AD_HANDSHAKE_FAILURE;
2561                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2562                         goto f_err;
2563                         }
2564                 /* Fail for TLS only if we required a certificate */
2565                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2566                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2567                         {
2568                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2569                         al=SSL_AD_HANDSHAKE_FAILURE;
2570                         goto f_err;
2571                         }
2572                 }
2573         else
2574                 {
2575                 i=ssl_verify_cert_chain(s,sk);
2576                 if (i <= 0)
2577                         {
2578                         al=ssl_verify_alarm_type(s->verify_result);
2579                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2580                         goto f_err;
2581                         }
2582                 }
2583
2584         if (s->session->peer != NULL) /* This should not be needed */
2585                 X509_free(s->session->peer);
2586         s->session->peer=sk_X509_shift(sk);
2587         s->session->verify_result = s->verify_result;
2588
2589         /* With the current implementation, sess_cert will always be NULL
2590          * when we arrive here. */
2591         if (s->session->sess_cert == NULL)
2592                 {
2593                 s->session->sess_cert = ssl_sess_cert_new();
2594                 if (s->session->sess_cert == NULL)
2595                         {
2596                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2597                         goto err;
2598                         }
2599                 }
2600         if (s->session->sess_cert->cert_chain != NULL)
2601                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2602         s->session->sess_cert->cert_chain=sk;
2603         /* Inconsistency alert: cert_chain does *not* include the
2604          * peer's own certificate, while we do include it in s3_clnt.c */
2605
2606         sk=NULL;
2607
2608         ret=1;
2609         if (0)
2610                 {
2611 f_err:
2612                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2613                 }
2614 err:
2615         if (x != NULL) X509_free(x);
2616         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2617         return(ret);
2618         }
2619
2620 int ssl3_send_server_certificate(SSL *s)
2621         {
2622         unsigned long l;
2623         X509 *x;
2624
2625         if (s->state == SSL3_ST_SW_CERT_A)
2626                 {
2627                 x=ssl_get_server_send_cert(s);
2628                 if (x == NULL &&
2629                         /* VRS: allow null cert if auth == KRB5 */
2630                         (s->s3->tmp.new_cipher->algorithms
2631                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2632                         != (SSL_aKRB5|SSL_kKRB5))
2633                         {
2634                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2635                         return(0);
2636                         }
2637
2638                 l=ssl3_output_cert_chain(s,x);
2639                 s->state=SSL3_ST_SW_CERT_B;
2640                 s->init_num=(int)l;
2641                 s->init_off=0;
2642                 }
2643
2644         /* SSL3_ST_SW_CERT_B */
2645         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2646         }
2647
2648
2649 #ifndef OPENSSL_NO_ECDH
2650 /* This is the complement of curve_id2nid in s3_clnt.c. */
2651 static int nid2curve_id(int nid)
2652 {
2653         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2654          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2655         switch (nid) {
2656         case NID_sect163k1: /* sect163k1 (1) */
2657                 return 1;
2658         case NID_sect163r1: /* sect163r1 (2) */
2659                 return 2;
2660         case NID_sect163r2: /* sect163r2 (3) */
2661                 return 3;
2662         case NID_sect193r1: /* sect193r1 (4) */ 
2663                 return 4;
2664         case NID_sect193r2: /* sect193r2 (5) */ 
2665                 return 5;
2666         case NID_sect233k1: /* sect233k1 (6) */
2667                 return 6;
2668         case NID_sect233r1: /* sect233r1 (7) */ 
2669                 return 7;
2670         case NID_sect239k1: /* sect239k1 (8) */ 
2671                 return 8;
2672         case NID_sect283k1: /* sect283k1 (9) */
2673                 return 9;
2674         case NID_sect283r1: /* sect283r1 (10) */ 
2675                 return 10;
2676         case NID_sect409k1: /* sect409k1 (11) */ 
2677                 return 11;
2678         case NID_sect409r1: /* sect409r1 (12) */
2679                 return 12;
2680         case NID_sect571k1: /* sect571k1 (13) */ 
2681                 return 13;
2682         case NID_sect571r1: /* sect571r1 (14) */ 
2683                 return 14;
2684         case NID_secp160k1: /* secp160k1 (15) */
2685                 return 15;
2686         case NID_secp160r1: /* secp160r1 (16) */ 
2687                 return 16;
2688         case NID_secp160r2: /* secp160r2 (17) */ 
2689                 return 17;
2690         case NID_secp192k1: /* secp192k1 (18) */
2691                 return 18;
2692         case NID_X9_62_prime192v1: /* secp192r1 (19) */ 
2693                 return 19;
2694         case NID_secp224k1: /* secp224k1 (20) */ 
2695                 return 20;
2696         case NID_secp224r1: /* secp224r1 (21) */
2697                 return 21;
2698         case NID_secp256k1: /* secp256k1 (22) */ 
2699                 return 22;
2700         case NID_X9_62_prime256v1: /* secp256r1 (23) */ 
2701                 return 23;
2702         case NID_secp384r1: /* secp384r1 (24) */
2703                 return 24;
2704         case NID_secp521r1:  /* secp521r1 (25) */       
2705                 return 25;
2706         default:
2707                 return 0;
2708         }
2709 }
2710 #endif
2711 #ifndef OPENSSL_NO_TLSEXT
2712 int ssl3_send_newsession_ticket(SSL *s)
2713         {
2714         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2715                 {
2716                 unsigned char *p, *senc, *macstart;
2717                 int len, slen;
2718                 unsigned int hlen;
2719                 EVP_CIPHER_CTX ctx;
2720                 HMAC_CTX hctx;
2721                 unsigned char iv[EVP_MAX_IV_LENGTH];
2722                 unsigned char key_name[16];
2723
2724                 /* get session encoding length */
2725                 slen = i2d_SSL_SESSION(s->session, NULL);
2726                 /* Some length values are 16 bits, so forget it if session is
2727                  * too long
2728                  */
2729                 if (slen > 0xFF00)
2730                         return -1;
2731                 /* Grow buffer if need be: the length calculation is as
2732                  * follows 1 (size of message name) + 3 (message length
2733                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2734                  * 16 (key name) + max_iv_len (iv length) +
2735                  * session_length + max_enc_block_size (max encrypted session
2736                  * length) + max_md_size (HMAC).
2737                  */
2738                 if (!BUF_MEM_grow(s->init_buf,
2739                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2740                         EVP_MAX_MD_SIZE + slen))
2741                         return -1;
2742                 senc = OPENSSL_malloc(slen);
2743                 if (!senc)
2744                         return -1;
2745                 p = senc;
2746                 i2d_SSL_SESSION(s->session, &p);
2747
2748                 p=(unsigned char *)s->init_buf->data;
2749                 /* do the header */
2750                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2751                 /* Skip message length for now */
2752                 p += 3;
2753                 EVP_CIPHER_CTX_init(&ctx);
2754                 HMAC_CTX_init(&hctx);
2755                 /* Initialize HMAC and cipher contexts. If callback present
2756                  * it does all the work otherwise use generated values
2757                  * from parent ctx.
2758                  */
2759                 if (s->ctx->tlsext_ticket_key_cb)
2760                         {
2761                         if (s->ctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
2762                                                          &hctx, 1) < 0)
2763                                 {
2764                                 OPENSSL_free(senc);
2765                                 return -1;
2766                                 }
2767                         }
2768                 else
2769                         {
2770                         RAND_pseudo_bytes(iv, 16);
2771                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2772                                         s->ctx->tlsext_tick_aes_key, iv);
2773                         HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
2774                                         tlsext_tick_md(), NULL);
2775                         memcpy(key_name, s->ctx->tlsext_tick_key_name, 16);
2776                         }
2777                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2778                 /* Skip ticket length for now */
2779                 p += 2;
2780                 /* Output key name */
2781                 macstart = p;
2782                 memcpy(p, key_name, 16);
2783                 p += 16;
2784                 /* output IV */
2785                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
2786                 p += EVP_CIPHER_CTX_iv_length(&ctx);
2787                 /* Encrypt session data */
2788                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2789                 p += len;
2790                 EVP_EncryptFinal(&ctx, p, &len);
2791                 p += len;
2792                 EVP_CIPHER_CTX_cleanup(&ctx);
2793
2794                 HMAC_Update(&hctx, macstart, p - macstart);
2795                 HMAC_Final(&hctx, p, &hlen);
2796                 HMAC_CTX_cleanup(&hctx);
2797
2798                 p += hlen;
2799                 /* Now write out lengths: p points to end of data written */
2800                 /* Total length */
2801                 len = p - (unsigned char *)s->init_buf->data;
2802                 p=(unsigned char *)s->init_buf->data + 1;
2803                 l2n3(len - 4, p); /* Message length */
2804                 p += 4;
2805                 s2n(len - 10, p);  /* Ticket length */
2806
2807                 /* number of bytes to write */
2808                 s->init_num= len;
2809                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
2810                 s->init_off=0;
2811                 OPENSSL_free(senc);
2812                 }
2813
2814         /* SSL3_ST_SW_SESSION_TICKET_B */
2815         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2816         }
2817
2818 int ssl3_send_cert_status(SSL *s)
2819         {
2820         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
2821                 {
2822                 unsigned char *p;
2823                 /* Grow buffer if need be: the length calculation is as
2824                  * follows 1 (message type) + 3 (message length) +
2825                  * 1 (ocsp response type) + 3 (ocsp response length)
2826                  * + (ocsp response)
2827                  */
2828                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
2829                         return -1;
2830
2831                 p=(unsigned char *)s->init_buf->data;
2832
2833                 /* do the header */
2834                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
2835                 /* message length */
2836                 l2n3(s->tlsext_ocsp_resplen + 4, p);
2837                 /* status type */
2838                 *(p++)= s->tlsext_status_type;
2839                 /* length of OCSP response */
2840                 l2n3(s->tlsext_ocsp_resplen, p);
2841                 /* actual response */
2842                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
2843                 /* number of bytes to write */
2844                 s->init_num = 8 + s->tlsext_ocsp_resplen;
2845                 s->state=SSL3_ST_SW_CERT_STATUS_B;
2846                 s->init_off = 0;
2847                 }
2848
2849         /* SSL3_ST_SW_CERT_STATUS_B */
2850         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2851         }
2852 #endif