Fixes for the following claims:
[openssl.git] / 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/x509.h>
136 #ifndef OPENSSL_NO_DH
137 #include <openssl/dh.h>
138 #endif
139 #include <openssl/bn.h>
140 #ifndef OPENSSL_NO_KRB5
141 #include <openssl/krb5_asn.h>
142 #endif
143 #include <openssl/md5.h>
144
145 static SSL_METHOD *ssl3_get_server_method(int ver);
146
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
294                         if (s->hit)
295                                 s->state=SSL3_ST_SW_CHANGE_A;
296                         else
297                                 s->state=SSL3_ST_SW_CERT_A;
298                         s->init_num=0;
299                         break;
300
301                 case SSL3_ST_SW_CERT_A:
302                 case SSL3_ST_SW_CERT_B:
303                         /* Check if it is anon DH or anon ECDH or KRB5 */
304                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)
305                                 && !(s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
306                                 {
307                                 ret=ssl3_send_server_certificate(s);
308                                 if (ret <= 0) goto end;
309                                 }
310                         else
311                                 skip=1;
312                         s->state=SSL3_ST_SW_KEY_EXCH_A;
313                         s->init_num=0;
314                         break;
315
316                 case SSL3_ST_SW_KEY_EXCH_A:
317                 case SSL3_ST_SW_KEY_EXCH_B:
318                         l=s->s3->tmp.new_cipher->algorithms;
319
320                         /* clear this, it may get reset by
321                          * send_server_key_exchange */
322                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
323 #ifndef OPENSSL_NO_KRB5
324                                 && !(l & SSL_KRB5)
325 #endif /* OPENSSL_NO_KRB5 */
326                                 )
327                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
328                                  * even when forbidden by protocol specs
329                                  * (handshake may fail as clients are not required to
330                                  * be able to handle this) */
331                                 s->s3->tmp.use_rsa_tmp=1;
332                         else
333                                 s->s3->tmp.use_rsa_tmp=0;
334
335
336                         /* only send if a DH key exchange, fortezza or
337                          * RSA but we have a sign only certificate
338                          *
339                          * For ECC ciphersuites, we send a serverKeyExchange
340                          * message only if the cipher suite is either
341                          * ECDH-anon or ECDHE. In other cases, the
342                          * server certificate contains the server's 
343                          * public key for key exchange.
344                          */
345                         if (s->s3->tmp.use_rsa_tmp
346                             || (l & SSL_kECDHE)
347                             || (l & (SSL_DH|SSL_kFZA))
348                             || ((l & SSL_kRSA)
349                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
350                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
351                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
352                                         )
353                                     )
354                                 )
355                             )
356                                 {
357                                 ret=ssl3_send_server_key_exchange(s);
358                                 if (ret <= 0) goto end;
359                                 }
360                         else
361                                 skip=1;
362
363                         s->state=SSL3_ST_SW_CERT_REQ_A;
364                         s->init_num=0;
365                         break;
366
367                 case SSL3_ST_SW_CERT_REQ_A:
368                 case SSL3_ST_SW_CERT_REQ_B:
369                         if (/* don't request cert unless asked for it: */
370                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
371                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
372                                  * don't request cert during re-negotiation: */
373                                 ((s->session->peer != NULL) &&
374                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
375                                 /* never request cert in anonymous ciphersuites
376                                  * (see section "Certificate request" in SSL 3 drafts
377                                  * and in RFC 2246): */
378                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
379                                  /* ... except when the application insists on verification
380                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
381                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
382                                  /* never request cert in Kerberos ciphersuites */
383                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
384                                 {
385                                 /* no cert request */
386                                 skip=1;
387                                 s->s3->tmp.cert_request=0;
388                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
389                                 }
390                         else
391                                 {
392                                 s->s3->tmp.cert_request=1;
393                                 ret=ssl3_send_certificate_request(s);
394                                 if (ret <= 0) goto end;
395 #ifndef NETSCAPE_HANG_BUG
396                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
397 #else
398                                 s->state=SSL3_ST_SW_FLUSH;
399                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
400 #endif
401                                 s->init_num=0;
402                                 }
403                         break;
404
405                 case SSL3_ST_SW_SRVR_DONE_A:
406                 case SSL3_ST_SW_SRVR_DONE_B:
407                         ret=ssl3_send_server_done(s);
408                         if (ret <= 0) goto end;
409                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
410                         s->state=SSL3_ST_SW_FLUSH;
411                         s->init_num=0;
412                         break;
413                 
414                 case SSL3_ST_SW_FLUSH:
415                         /* number of bytes to be flushed */
416                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
417                         if (num1 > 0)
418                                 {
419                                 s->rwstate=SSL_WRITING;
420                                 num1=BIO_flush(s->wbio);
421                                 if (num1 <= 0) { ret= -1; goto end; }
422                                 s->rwstate=SSL_NOTHING;
423                                 }
424
425                         s->state=s->s3->tmp.next_state;
426                         break;
427
428                 case SSL3_ST_SR_CERT_A:
429                 case SSL3_ST_SR_CERT_B:
430                         /* Check for second client hello (MS SGC) */
431                         ret = ssl3_check_client_hello(s);
432                         if (ret <= 0)
433                                 goto end;
434                         if (ret == 2)
435                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
436                         else {
437                                 if (s->s3->tmp.cert_request)
438                                         {
439                                         ret=ssl3_get_client_certificate(s);
440                                         if (ret <= 0) goto end;
441                                         }
442                                 s->init_num=0;
443                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
444                         }
445                         break;
446
447                 case SSL3_ST_SR_KEY_EXCH_A:
448                 case SSL3_ST_SR_KEY_EXCH_B:
449                         ret=ssl3_get_client_key_exchange(s);
450                         if (ret <= 0) 
451                                 goto end;
452                         if (ret == 2)
453                                 {
454                                 /* For the ECDH ciphersuites when
455                                  * the client sends its ECDH pub key in
456                                  * a certificate, the CertificateVerify
457                                  * message is not sent.
458                                  */
459                                 s->state=SSL3_ST_SR_FINISHED_A;
460                                 s->init_num = 0;
461                                 }
462                         else   
463                                 {
464                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
465                                 s->init_num=0;
466
467                                 /* We need to get hashes here so if there is
468                                  * a client cert, it can be verified
469                                  */ 
470                                 s->method->ssl3_enc->cert_verify_mac(s,
471                                     &(s->s3->finish_dgst1),
472                                     &(s->s3->tmp.cert_verify_md[0]));
473                                 s->method->ssl3_enc->cert_verify_mac(s,
474                                     &(s->s3->finish_dgst2),
475                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
476                                 }
477                         break;
478
479                 case SSL3_ST_SR_CERT_VRFY_A:
480                 case SSL3_ST_SR_CERT_VRFY_B:
481
482                         /* we should decide if we expected this one */
483                         ret=ssl3_get_cert_verify(s);
484                         if (ret <= 0) goto end;
485
486                         s->state=SSL3_ST_SR_FINISHED_A;
487                         s->init_num=0;
488                         break;
489
490                 case SSL3_ST_SR_FINISHED_A:
491                 case SSL3_ST_SR_FINISHED_B:
492                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
493                                 SSL3_ST_SR_FINISHED_B);
494                         if (ret <= 0) goto end;
495                         if (s->hit)
496                                 s->state=SSL_ST_OK;
497                         else
498                                 s->state=SSL3_ST_SW_CHANGE_A;
499                         s->init_num=0;
500                         break;
501
502                 case SSL3_ST_SW_CHANGE_A:
503                 case SSL3_ST_SW_CHANGE_B:
504
505                         s->session->cipher=s->s3->tmp.new_cipher;
506                         if (!s->method->ssl3_enc->setup_key_block(s))
507                                 { ret= -1; goto end; }
508
509                         ret=ssl3_send_change_cipher_spec(s,
510                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
511
512                         if (ret <= 0) goto end;
513                         s->state=SSL3_ST_SW_FINISHED_A;
514                         s->init_num=0;
515
516                         if (!s->method->ssl3_enc->change_cipher_state(s,
517                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
518                                 {
519                                 ret= -1;
520                                 goto end;
521                                 }
522
523                         break;
524
525                 case SSL3_ST_SW_FINISHED_A:
526                 case SSL3_ST_SW_FINISHED_B:
527                         ret=ssl3_send_finished(s,
528                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
529                                 s->method->ssl3_enc->server_finished_label,
530                                 s->method->ssl3_enc->server_finished_label_len);
531                         if (ret <= 0) goto end;
532                         s->state=SSL3_ST_SW_FLUSH;
533                         if (s->hit)
534                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
535                         else
536                                 s->s3->tmp.next_state=SSL_ST_OK;
537                         s->init_num=0;
538                         break;
539
540                 case SSL_ST_OK:
541                         /* clean a few things up */
542                         ssl3_cleanup_key_block(s);
543
544                         BUF_MEM_free(s->init_buf);
545                         s->init_buf=NULL;
546
547                         /* remove buffering on output */
548                         ssl_free_wbio_buffer(s);
549
550                         s->init_num=0;
551
552                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
553                                 {
554                                 /* actually not necessarily a 'new' session unless
555                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
556                                 
557                                 s->new_session=0;
558                                 
559                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
560                                 
561                                 s->ctx->stats.sess_accept_good++;
562                                 /* s->server=1; */
563                                 s->handshake_func=ssl3_accept;
564
565                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
566                                 }
567                         
568                         ret = 1;
569                         goto end;
570                         /* break; */
571
572                 default:
573                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
574                         ret= -1;
575                         goto end;
576                         /* break; */
577                         }
578                 
579                 if (!s->s3->tmp.reuse_message && !skip)
580                         {
581                         if (s->debug)
582                                 {
583                                 if ((ret=BIO_flush(s->wbio)) <= 0)
584                                         goto end;
585                                 }
586
587
588                         if ((cb != NULL) && (s->state != state))
589                                 {
590                                 new_state=s->state;
591                                 s->state=state;
592                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
593                                 s->state=new_state;
594                                 }
595                         }
596                 skip=0;
597                 }
598 end:
599         /* BIO_flush(s->wbio); */
600
601         s->in_handshake--;
602         if (cb != NULL)
603                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
604         return(ret);
605         }
606
607 int ssl3_send_hello_request(SSL *s)
608         {
609         unsigned char *p;
610
611         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
612                 {
613                 p=(unsigned char *)s->init_buf->data;
614                 *(p++)=SSL3_MT_HELLO_REQUEST;
615                 *(p++)=0;
616                 *(p++)=0;
617                 *(p++)=0;
618
619                 s->state=SSL3_ST_SW_HELLO_REQ_B;
620                 /* number of bytes to write */
621                 s->init_num=4;
622                 s->init_off=0;
623                 }
624
625         /* SSL3_ST_SW_HELLO_REQ_B */
626         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
627         }
628
629 int ssl3_check_client_hello(SSL *s)
630         {
631         int ok;
632         long n;
633
634         /* this function is called when we really expect a Certificate message,
635          * so permit appropriate message length */
636         n=s->method->ssl_get_message(s,
637                 SSL3_ST_SR_CERT_A,
638                 SSL3_ST_SR_CERT_B,
639                 -1,
640                 s->max_cert_list,
641                 &ok);
642         if (!ok) return((int)n);
643         s->s3->tmp.reuse_message = 1;
644         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
645                 {
646                 /* Throw away what we have done so far in the current handshake,
647                  * which will now be aborted. (A full SSL_clear would be too much.)
648                  * I hope that tmp.dh is the only thing that may need to be cleared
649                  * when a handshake is not completed ... */
650 #ifndef OPENSSL_NO_DH
651                 if (s->s3->tmp.dh != NULL)
652                         {
653                         DH_free(s->s3->tmp.dh);
654                         s->s3->tmp.dh = NULL;
655                         }
656 #endif
657                 return 2;
658                 }
659         return 1;
660 }
661
662 int ssl3_get_client_hello(SSL *s)
663         {
664         int i,j,ok,al,ret= -1;
665         unsigned int cookie_len;
666         long n;
667         unsigned long id;
668         unsigned char *p,*d,*q;
669         SSL_CIPHER *c;
670 #ifndef OPENSSL_NO_COMP
671         SSL_COMP *comp=NULL;
672 #endif
673         STACK_OF(SSL_CIPHER) *ciphers=NULL;
674
675         /* We do this so that we will respond with our native type.
676          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
677          * This down switching should be handled by a different method.
678          * If we are SSLv3, we will respond with SSLv3, even if prompted with
679          * TLSv1.
680          */
681         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
682                 {
683                 s->first_packet=1;
684                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
685                 }
686         n=s->method->ssl_get_message(s,
687                 SSL3_ST_SR_CLNT_HELLO_B,
688                 SSL3_ST_SR_CLNT_HELLO_C,
689                 SSL3_MT_CLIENT_HELLO,
690                 SSL3_RT_MAX_PLAIN_LENGTH,
691                 &ok);
692
693         if (!ok) return((int)n);
694         d=p=(unsigned char *)s->init_msg;
695
696         /* use version from inside client hello, not from record header
697          * (may differ: see RFC 2246, Appendix E, second paragraph) */
698         s->client_version=(((int)p[0])<<8)|(int)p[1];
699         p+=2;
700
701         if (s->client_version < s->version)
702                 {
703                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
704                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR) 
705                         {
706                         /* similar to ssl3_get_record, send alert using remote version number */
707                         s->version = s->client_version;
708                         }
709                 al = SSL_AD_PROTOCOL_VERSION;
710                 goto f_err;
711                 }
712
713         /* load the client random */
714         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
715         p+=SSL3_RANDOM_SIZE;
716
717         /* get the session-id */
718         j= *(p++);
719
720         s->hit=0;
721         /* Versions before 0.9.7 always allow session reuse during renegotiation
722          * (i.e. when s->new_session is true), option
723          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
724          * Maybe this optional behaviour should always have been the default,
725          * but we cannot safely change the default behaviour (or new applications
726          * might be written that become totally unsecure when compiled with
727          * an earlier library version)
728          */
729         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
730                 {
731                 if (!ssl_get_new_session(s,1))
732                         goto err;
733                 }
734         else
735                 {
736                 i=ssl_get_prev_session(s,p,j);
737                 if (i == 1)
738                         { /* previous session */
739                         s->hit=1;
740                         }
741                 else if (i == -1)
742                         goto err;
743                 else /* i == 0 */
744                         {
745                         if (!ssl_get_new_session(s,1))
746                                 goto err;
747                         }
748                 }
749
750         p+=j;
751
752         if (SSL_version(s) == DTLS1_VERSION)
753                 {
754                 /* cookie stuff */
755                 cookie_len = *(p++);
756
757                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
758                         s->d1->send_cookie == 0)
759                         {
760                         /* HelloVerifyMessage has already been sent */
761                         if ( cookie_len != s->d1->cookie_len)
762                                 {
763                                 al = SSL_AD_HANDSHAKE_FAILURE;
764                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
765                                 goto f_err;
766                                 }
767                         }
768
769                 /* 
770                  * The ClientHello may contain a cookie even if the
771                  * HelloVerify message has not been sent--make sure that it
772                  * does not cause an overflow.
773                  */
774                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
775                         {
776                         /* too much data */
777                         al = SSL_AD_DECODE_ERROR;
778                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
779                         goto f_err;
780                         }
781
782                 /* verify the cookie if appropriate option is set. */
783                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
784                         cookie_len > 0)
785                         {
786                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
787
788                         if ( s->ctx->app_verify_cookie_cb != NULL)
789                                 {
790                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
791                                         cookie_len) == 0)
792                                         {
793                                         al=SSL_AD_HANDSHAKE_FAILURE;
794                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
795                                                 SSL_R_COOKIE_MISMATCH);
796                                         goto f_err;
797                                         }
798                                 /* else cookie verification succeeded */
799                                 }
800                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
801                                                   s->d1->cookie_len) != 0) /* default verification */
802                                 {
803                                         al=SSL_AD_HANDSHAKE_FAILURE;
804                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
805                                                 SSL_R_COOKIE_MISMATCH);
806                                         goto f_err;
807                                 }
808                         }
809
810                 p += cookie_len;
811                 }
812
813         n2s(p,i);
814         if ((i == 0) && (j != 0))
815                 {
816                 /* we need a cipher if we are not resuming a session */
817                 al=SSL_AD_ILLEGAL_PARAMETER;
818                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
819                 goto f_err;
820                 }
821         if ((p+i) >= (d+n))
822                 {
823                 /* not enough data */
824                 al=SSL_AD_DECODE_ERROR;
825                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
826                 goto f_err;
827                 }
828         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
829                 == NULL))
830                 {
831                 goto err;
832                 }
833         p+=i;
834
835         /* If it is a hit, check that the cipher is in the list */
836         if ((s->hit) && (i > 0))
837                 {
838                 j=0;
839                 id=s->session->cipher->id;
840
841 #ifdef CIPHER_DEBUG
842                 printf("client sent %d ciphers\n",sk_num(ciphers));
843 #endif
844                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
845                         {
846                         c=sk_SSL_CIPHER_value(ciphers,i);
847 #ifdef CIPHER_DEBUG
848                         printf("client [%2d of %2d]:%s\n",
849                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
850 #endif
851                         if (c->id == id)
852                                 {
853                                 j=1;
854                                 break;
855                                 }
856                         }
857                 if (j == 0)
858                         {
859                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
860                                 {
861                                 /* Very bad for multi-threading.... */
862                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers, 0);
863                                 }
864                         else
865                                 {
866                                 /* we need to have the cipher in the cipher
867                                  * list if we are asked to reuse it */
868                                 al=SSL_AD_ILLEGAL_PARAMETER;
869                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
870                                 goto f_err;
871                                 }
872                         }
873                 }
874
875         /* compression */
876         i= *(p++);
877         if ((p+i) > (d+n))
878                 {
879                 /* not enough data */
880                 al=SSL_AD_DECODE_ERROR;
881                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
882                 goto f_err;
883                 }
884         q=p;
885         for (j=0; j<i; j++)
886                 {
887                 if (p[j] == 0) break;
888                 }
889
890         p+=i;
891         if (j >= i)
892                 {
893                 /* no compress */
894                 al=SSL_AD_DECODE_ERROR;
895                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
896                 goto f_err;
897                 }
898
899         /* Worst case, we will use the NULL compression, but if we have other
900          * options, we will now look for them.  We have i-1 compression
901          * algorithms from the client, starting at q. */
902         s->s3->tmp.new_compression=NULL;
903 #ifndef OPENSSL_NO_COMP
904         if (s->ctx->comp_methods != NULL)
905                 { /* See if we have a match */
906                 int m,nn,o,v,done=0;
907
908                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
909                 for (m=0; m<nn; m++)
910                         {
911                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
912                         v=comp->id;
913                         for (o=0; o<i; o++)
914                                 {
915                                 if (v == q[o])
916                                         {
917                                         done=1;
918                                         break;
919                                         }
920                                 }
921                         if (done) break;
922                         }
923                 if (done)
924                         s->s3->tmp.new_compression=comp;
925                 else
926                         comp=NULL;
927                 }
928 #endif
929
930         /* TLS does not mind if there is extra stuff */
931 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
932          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
933          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
934         if (s->version == SSL3_VERSION)
935                 {
936                 if (p < (d+n))
937                         {
938                         /* wrong number of bytes,
939                          * there could be more to follow */
940                         al=SSL_AD_DECODE_ERROR;
941                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
942                         goto f_err;
943                         }
944                 }
945 #endif
946
947         /* Given s->session->ciphers and SSL_get_ciphers, we must
948          * pick a cipher */
949
950         if (!s->hit)
951                 {
952 #ifdef OPENSSL_NO_COMP
953                 s->session->compress_meth=0;
954 #else
955                 s->session->compress_meth=(comp == NULL)?0:comp->id;
956 #endif
957                 if (s->session->ciphers != NULL)
958                         sk_SSL_CIPHER_free(s->session->ciphers);
959                 s->session->ciphers=ciphers;
960                 if (ciphers == NULL)
961                         {
962                         al=SSL_AD_ILLEGAL_PARAMETER;
963                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
964                         goto f_err;
965                         }
966                 ciphers=NULL;
967                 c=ssl3_choose_cipher(s,s->session->ciphers,
968                                      SSL_get_ciphers(s));
969
970                 if (c == NULL)
971                         {
972                         al=SSL_AD_HANDSHAKE_FAILURE;
973                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
974                         goto f_err;
975                         }
976                 s->s3->tmp.new_cipher=c;
977                 }
978         else
979                 {
980                 /* Session-id reuse */
981 #ifdef REUSE_CIPHER_BUG
982                 STACK_OF(SSL_CIPHER) *sk;
983                 SSL_CIPHER *nc=NULL;
984                 SSL_CIPHER *ec=NULL;
985
986                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
987                         {
988                         sk=s->session->ciphers;
989                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
990                                 {
991                                 c=sk_SSL_CIPHER_value(sk,i);
992                                 if (c->algorithms & SSL_eNULL)
993                                         nc=c;
994                                 if (SSL_C_IS_EXPORT(c))
995                                         ec=c;
996                                 }
997                         if (nc != NULL)
998                                 s->s3->tmp.new_cipher=nc;
999                         else if (ec != NULL)
1000                                 s->s3->tmp.new_cipher=ec;
1001                         else
1002                                 s->s3->tmp.new_cipher=s->session->cipher;
1003                         }
1004                 else
1005 #endif
1006                 s->s3->tmp.new_cipher=s->session->cipher;
1007                 }
1008         
1009         /* we now have the following setup. 
1010          * client_random
1011          * cipher_list          - our prefered list of ciphers
1012          * ciphers              - the clients prefered list of ciphers
1013          * compression          - basically ignored right now
1014          * ssl version is set   - sslv3
1015          * s->session           - The ssl session has been setup.
1016          * s->hit               - session reuse flag
1017          * s->tmp.new_cipher    - the new cipher to use.
1018          */
1019
1020         ret=1;
1021         if (0)
1022                 {
1023 f_err:
1024                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1025                 }
1026 err:
1027         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1028         return(ret);
1029         }
1030
1031 int ssl3_send_server_hello(SSL *s)
1032         {
1033         unsigned char *buf;
1034         unsigned char *p,*d;
1035         int i,sl;
1036         unsigned long l,Time;
1037
1038         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1039                 {
1040                 buf=(unsigned char *)s->init_buf->data;
1041                 p=s->s3->server_random;
1042                 Time=(unsigned long)time(NULL);                 /* Time */
1043                 l2n(Time,p);
1044                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1045                         return -1;
1046                 /* Do the message type and length last */
1047                 d=p= &(buf[4]);
1048
1049                 *(p++)=s->version>>8;
1050                 *(p++)=s->version&0xff;
1051
1052                 /* Random stuff */
1053                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1054                 p+=SSL3_RANDOM_SIZE;
1055
1056                 /* now in theory we have 3 options to sending back the
1057                  * session id.  If it is a re-use, we send back the
1058                  * old session-id, if it is a new session, we send
1059                  * back the new session-id or we send back a 0 length
1060                  * session-id if we want it to be single use.
1061                  * Currently I will not implement the '0' length session-id
1062                  * 12-Jan-98 - I'll now support the '0' length stuff.
1063                  */
1064                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1065                         s->session->session_id_length=0;
1066
1067                 sl=s->session->session_id_length;
1068                 if (sl > (int)sizeof(s->session->session_id))
1069                         {
1070                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1071                         return -1;
1072                         }
1073                 *(p++)=sl;
1074                 memcpy(p,s->session->session_id,sl);
1075                 p+=sl;
1076
1077                 /* put the cipher */
1078                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1079                 p+=i;
1080
1081                 /* put the compression method */
1082 #ifdef OPENSSL_NO_COMP
1083                         *(p++)=0;
1084 #else
1085                 if (s->s3->tmp.new_compression == NULL)
1086                         *(p++)=0;
1087                 else
1088                         *(p++)=s->s3->tmp.new_compression->id;
1089 #endif
1090
1091                 /* do the header */
1092                 l=(p-d);
1093                 d=buf;
1094                 *(d++)=SSL3_MT_SERVER_HELLO;
1095                 l2n3(l,d);
1096
1097                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1098                 /* number of bytes to write */
1099                 s->init_num=p-buf;
1100                 s->init_off=0;
1101                 }
1102
1103         /* SSL3_ST_CW_CLNT_HELLO_B */
1104         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1105         }
1106
1107 int ssl3_send_server_done(SSL *s)
1108         {
1109         unsigned char *p;
1110
1111         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1112                 {
1113                 p=(unsigned char *)s->init_buf->data;
1114
1115                 /* do the header */
1116                 *(p++)=SSL3_MT_SERVER_DONE;
1117                 *(p++)=0;
1118                 *(p++)=0;
1119                 *(p++)=0;
1120
1121                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1122                 /* number of bytes to write */
1123                 s->init_num=4;
1124                 s->init_off=0;
1125                 }
1126
1127         /* SSL3_ST_CW_CLNT_HELLO_B */
1128         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1129         }
1130
1131 int ssl3_send_server_key_exchange(SSL *s)
1132         {
1133 #ifndef OPENSSL_NO_RSA
1134         unsigned char *q;
1135         int j,num;
1136         RSA *rsa;
1137         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1138         unsigned int u;
1139 #endif
1140 #ifndef OPENSSL_NO_DH
1141         DH *dh=NULL,*dhp;
1142 #endif
1143 #ifndef OPENSSL_NO_ECDH
1144         EC_KEY *ecdh=NULL, *ecdhp;
1145         unsigned char *encodedPoint = NULL;
1146         int encodedlen = 0;
1147         int curve_id = 0;
1148         BN_CTX *bn_ctx = NULL; 
1149 #endif
1150         EVP_PKEY *pkey;
1151         unsigned char *p,*d;
1152         int al,i;
1153         unsigned long type;
1154         int n;
1155         CERT *cert;
1156         BIGNUM *r[4];
1157         int nr[4],kn;
1158         BUF_MEM *buf;
1159         EVP_MD_CTX md_ctx;
1160
1161         EVP_MD_CTX_init(&md_ctx);
1162         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1163                 {
1164                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1165                 cert=s->cert;
1166
1167                 buf=s->init_buf;
1168
1169                 r[0]=r[1]=r[2]=r[3]=NULL;
1170                 n=0;
1171 #ifndef OPENSSL_NO_RSA
1172                 if (type & SSL_kRSA)
1173                         {
1174                         rsa=cert->rsa_tmp;
1175                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1176                                 {
1177                                 rsa=s->cert->rsa_tmp_cb(s,
1178                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1179                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1180                                 if(rsa == NULL)
1181                                 {
1182                                         al=SSL_AD_HANDSHAKE_FAILURE;
1183                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1184                                         goto f_err;
1185                                 }
1186                                 RSA_up_ref(rsa);
1187                                 cert->rsa_tmp=rsa;
1188                                 }
1189                         if (rsa == NULL)
1190                                 {
1191                                 al=SSL_AD_HANDSHAKE_FAILURE;
1192                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1193                                 goto f_err;
1194                                 }
1195                         r[0]=rsa->n;
1196                         r[1]=rsa->e;
1197                         s->s3->tmp.use_rsa_tmp=1;
1198                         }
1199                 else
1200 #endif
1201 #ifndef OPENSSL_NO_DH
1202                         if (type & SSL_kEDH)
1203                         {
1204                         dhp=cert->dh_tmp;
1205                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1206                                 dhp=s->cert->dh_tmp_cb(s,
1207                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1208                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1209                         if (dhp == NULL)
1210                                 {
1211                                 al=SSL_AD_HANDSHAKE_FAILURE;
1212                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1213                                 goto f_err;
1214                                 }
1215
1216                         if (s->s3->tmp.dh != NULL)
1217                                 {
1218                                 DH_free(dh);
1219                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1220                                 goto err;
1221                                 }
1222
1223                         if ((dh=DHparams_dup(dhp)) == NULL)
1224                                 {
1225                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1226                                 goto err;
1227                                 }
1228
1229                         s->s3->tmp.dh=dh;
1230                         if ((dhp->pub_key == NULL ||
1231                              dhp->priv_key == NULL ||
1232                              (s->options & SSL_OP_SINGLE_DH_USE)))
1233                                 {
1234                                 if(!DH_generate_key(dh))
1235                                     {
1236                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1237                                            ERR_R_DH_LIB);
1238                                     goto err;
1239                                     }
1240                                 }
1241                         else
1242                                 {
1243                                 dh->pub_key=BN_dup(dhp->pub_key);
1244                                 dh->priv_key=BN_dup(dhp->priv_key);
1245                                 if ((dh->pub_key == NULL) ||
1246                                         (dh->priv_key == NULL))
1247                                         {
1248                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1249                                         goto err;
1250                                         }
1251                                 }
1252                         r[0]=dh->p;
1253                         r[1]=dh->g;
1254                         r[2]=dh->pub_key;
1255                         }
1256                 else 
1257 #endif
1258 #ifndef OPENSSL_NO_ECDH
1259                         if (type & SSL_kECDHE)
1260                         {
1261                         const EC_GROUP *group;
1262
1263                         ecdhp=cert->ecdh_tmp;
1264                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1265                                 {
1266                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1267                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1268                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1269                                 }
1270                         if (ecdhp == NULL)
1271                                 {
1272                                 al=SSL_AD_HANDSHAKE_FAILURE;
1273                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1274                                 goto f_err;
1275                                 }
1276
1277                         if (s->s3->tmp.ecdh != NULL)
1278                                 {
1279                                 EC_KEY_free(s->s3->tmp.ecdh); 
1280                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1281                                 goto err;
1282                                 }
1283
1284                         /* Duplicate the ECDH structure. */
1285                         if (ecdhp == NULL)
1286                                 {
1287                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1288                                 goto err;
1289                                 }
1290                         if (!EC_KEY_up_ref(ecdhp))
1291                                 {
1292                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1293                                 goto err;
1294                                 }
1295                         ecdh = ecdhp;
1296
1297                         s->s3->tmp.ecdh=ecdh;
1298                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1299                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1300                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1301                                 {
1302                                 if(!EC_KEY_generate_key(ecdh))
1303                                     {
1304                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1305                                     goto err;
1306                                     }
1307                                 }
1308
1309                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1310                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1311                             (EC_KEY_get0_private_key(ecdh) == NULL))
1312                                 {
1313                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1314                                 goto err;
1315                                 }
1316
1317                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1318                             (EC_GROUP_get_degree(group) > 163)) 
1319                                 {
1320                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1321                                 goto err;
1322                                 }
1323
1324                         /* XXX: For now, we only support ephemeral ECDH
1325                          * keys over named (not generic) curves. For 
1326                          * supported named curves, curve_id is non-zero.
1327                          */
1328                         if ((curve_id = 
1329                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1330                             == 0)
1331                                 {
1332                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1333                                 goto err;
1334                                 }
1335
1336                         /* Encode the public key.
1337                          * First check the size of encoding and
1338                          * allocate memory accordingly.
1339                          */
1340                         encodedlen = EC_POINT_point2oct(group, 
1341                             EC_KEY_get0_public_key(ecdh),
1342                             POINT_CONVERSION_UNCOMPRESSED, 
1343                             NULL, 0, NULL);
1344
1345                         encodedPoint = (unsigned char *) 
1346                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1347                         bn_ctx = BN_CTX_new();
1348                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1349                                 {
1350                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1351                                 goto err;
1352                                 }
1353
1354
1355                         encodedlen = EC_POINT_point2oct(group, 
1356                             EC_KEY_get0_public_key(ecdh), 
1357                             POINT_CONVERSION_UNCOMPRESSED, 
1358                             encodedPoint, encodedlen, bn_ctx);
1359
1360                         if (encodedlen == 0) 
1361                                 {
1362                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1363                                 goto err;
1364                                 }
1365
1366                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1367
1368                         /* XXX: For now, we only support named (not 
1369                          * generic) curves in ECDH ephemeral key exchanges.
1370                          * In this situation, we need four additional bytes
1371                          * to encode the entire ServerECDHParams
1372                          * structure. 
1373                          */
1374                         n = 4 + encodedlen;
1375
1376                         /* We'll generate the serverKeyExchange message
1377                          * explicitly so we can set these to NULLs
1378                          */
1379                         r[0]=NULL;
1380                         r[1]=NULL;
1381                         r[2]=NULL;
1382                         r[3]=NULL;
1383                         }
1384                 else 
1385 #endif /* !OPENSSL_NO_ECDH */
1386                         {
1387                         al=SSL_AD_HANDSHAKE_FAILURE;
1388                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1389                         goto f_err;
1390                         }
1391                 for (i=0; r[i] != NULL; i++)
1392                         {
1393                         nr[i]=BN_num_bytes(r[i]);
1394                         n+=2+nr[i];
1395                         }
1396
1397                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1398                         {
1399                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1400                                 == NULL)
1401                                 {
1402                                 al=SSL_AD_DECODE_ERROR;
1403                                 goto f_err;
1404                                 }
1405                         kn=EVP_PKEY_size(pkey);
1406                         }
1407                 else
1408                         {
1409                         pkey=NULL;
1410                         kn=0;
1411                         }
1412
1413                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1414                         {
1415                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1416                         goto err;
1417                         }
1418                 d=(unsigned char *)s->init_buf->data;
1419                 p= &(d[4]);
1420
1421                 for (i=0; r[i] != NULL; i++)
1422                         {
1423                         s2n(nr[i],p);
1424                         BN_bn2bin(r[i],p);
1425                         p+=nr[i];
1426                         }
1427
1428 #ifndef OPENSSL_NO_ECDH
1429                 if (type & SSL_kECDHE) 
1430                         {
1431                         /* XXX: For now, we only support named (not generic) curves.
1432                          * In this situation, the serverKeyExchange message has:
1433                          * [1 byte CurveType], [2 byte CurveName]
1434                          * [1 byte length of encoded point], followed by
1435                          * the actual encoded point itself
1436                          */
1437                         *p = NAMED_CURVE_TYPE;
1438                         p += 1;
1439                         *p = 0;
1440                         p += 1;
1441                         *p = curve_id;
1442                         p += 1;
1443                         *p = encodedlen;
1444                         p += 1;
1445                         memcpy((unsigned char*)p, 
1446                             (unsigned char *)encodedPoint, 
1447                             encodedlen);
1448                         OPENSSL_free(encodedPoint);
1449                         p += encodedlen;
1450                         }
1451 #endif
1452
1453                 /* not anonymous */
1454                 if (pkey != NULL)
1455                         {
1456                         /* n is the length of the params, they start at &(d[4])
1457                          * and p points to the space at the end. */
1458 #ifndef OPENSSL_NO_RSA
1459                         if (pkey->type == EVP_PKEY_RSA)
1460                                 {
1461                                 q=md_buf;
1462                                 j=0;
1463                                 for (num=2; num > 0; num--)
1464                                         {
1465                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1466                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1467                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1468                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1469                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1470                                         EVP_DigestFinal_ex(&md_ctx,q,
1471                                                 (unsigned int *)&i);
1472                                         q+=i;
1473                                         j+=i;
1474                                         }
1475                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1476                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1477                                         {
1478                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1479                                         goto err;
1480                                         }
1481                                 s2n(u,p);
1482                                 n+=u+2;
1483                                 }
1484                         else
1485 #endif
1486 #if !defined(OPENSSL_NO_DSA)
1487                                 if (pkey->type == EVP_PKEY_DSA)
1488                                 {
1489                                 /* lets do DSS */
1490                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1491                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1492                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1493                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1494                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1495                                         (unsigned int *)&i,pkey))
1496                                         {
1497                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1498                                         goto err;
1499                                         }
1500                                 s2n(i,p);
1501                                 n+=i+2;
1502                                 }
1503                         else
1504 #endif
1505 #if !defined(OPENSSL_NO_ECDSA)
1506                                 if (pkey->type == EVP_PKEY_EC)
1507                                 {
1508                                 /* let's do ECDSA */
1509                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1510                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1511                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1512                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1513                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1514                                         (unsigned int *)&i,pkey))
1515                                         {
1516                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1517                                         goto err;
1518                                         }
1519                                 s2n(i,p);
1520                                 n+=i+2;
1521                                 }
1522                         else
1523 #endif
1524                                 {
1525                                 /* Is this error check actually needed? */
1526                                 al=SSL_AD_HANDSHAKE_FAILURE;
1527                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1528                                 goto f_err;
1529                                 }
1530                         }
1531
1532                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1533                 l2n3(n,d);
1534
1535                 /* we should now have things packed up, so lets send
1536                  * it off */
1537                 s->init_num=n+4;
1538                 s->init_off=0;
1539                 }
1540
1541         s->state = SSL3_ST_SW_KEY_EXCH_B;
1542         EVP_MD_CTX_cleanup(&md_ctx);
1543         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1544 f_err:
1545         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1546 err:
1547 #ifndef OPENSSL_NO_ECDH
1548         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1549         BN_CTX_free(bn_ctx);
1550 #endif
1551         EVP_MD_CTX_cleanup(&md_ctx);
1552         return(-1);
1553         }
1554
1555 int ssl3_send_certificate_request(SSL *s)
1556         {
1557         unsigned char *p,*d;
1558         int i,j,nl,off,n;
1559         STACK_OF(X509_NAME) *sk=NULL;
1560         X509_NAME *name;
1561         BUF_MEM *buf;
1562
1563         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1564                 {
1565                 buf=s->init_buf;
1566
1567                 d=p=(unsigned char *)&(buf->data[4]);
1568
1569                 /* get the list of acceptable cert types */
1570                 p++;
1571                 n=ssl3_get_req_cert_type(s,p);
1572                 d[0]=n;
1573                 p+=n;
1574                 n++;
1575
1576                 off=n;
1577                 p+=2;
1578                 n+=2;
1579
1580                 sk=SSL_get_client_CA_list(s);
1581                 nl=0;
1582                 if (sk != NULL)
1583                         {
1584                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1585                                 {
1586                                 name=sk_X509_NAME_value(sk,i);
1587                                 j=i2d_X509_NAME(name,NULL);
1588                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1589                                         {
1590                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1591                                         goto err;
1592                                         }
1593                                 p=(unsigned char *)&(buf->data[4+n]);
1594                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1595                                         {
1596                                         s2n(j,p);
1597                                         i2d_X509_NAME(name,&p);
1598                                         n+=2+j;
1599                                         nl+=2+j;
1600                                         }
1601                                 else
1602                                         {
1603                                         d=p;
1604                                         i2d_X509_NAME(name,&p);
1605                                         j-=2; s2n(j,d); j+=2;
1606                                         n+=j;
1607                                         nl+=j;
1608                                         }
1609                                 }
1610                         }
1611                 /* else no CA names */
1612                 p=(unsigned char *)&(buf->data[4+off]);
1613                 s2n(nl,p);
1614
1615                 d=(unsigned char *)buf->data;
1616                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1617                 l2n3(n,d);
1618
1619                 /* we should now have things packed up, so lets send
1620                  * it off */
1621
1622                 s->init_num=n+4;
1623                 s->init_off=0;
1624 #ifdef NETSCAPE_HANG_BUG
1625                 p=(unsigned char *)s->init_buf->data + s->init_num;
1626
1627                 /* do the header */
1628                 *(p++)=SSL3_MT_SERVER_DONE;
1629                 *(p++)=0;
1630                 *(p++)=0;
1631                 *(p++)=0;
1632                 s->init_num += 4;
1633 #endif
1634
1635                 s->state = SSL3_ST_SW_CERT_REQ_B;
1636                 }
1637
1638         /* SSL3_ST_SW_CERT_REQ_B */
1639         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1640 err:
1641         return(-1);
1642         }
1643
1644 int ssl3_get_client_key_exchange(SSL *s)
1645         {
1646         int i,al,ok;
1647         long n;
1648         unsigned long l;
1649         unsigned char *p;
1650 #ifndef OPENSSL_NO_RSA
1651         RSA *rsa=NULL;
1652         EVP_PKEY *pkey=NULL;
1653 #endif
1654 #ifndef OPENSSL_NO_DH
1655         BIGNUM *pub=NULL;
1656         DH *dh_srvr;
1657 #endif
1658 #ifndef OPENSSL_NO_KRB5
1659         KSSL_ERR kssl_err;
1660 #endif /* OPENSSL_NO_KRB5 */
1661
1662 #ifndef OPENSSL_NO_ECDH
1663         EC_KEY *srvr_ecdh = NULL;
1664         EVP_PKEY *clnt_pub_pkey = NULL;
1665         EC_POINT *clnt_ecpoint = NULL;
1666         BN_CTX *bn_ctx = NULL; 
1667 #endif
1668
1669         n=s->method->ssl_get_message(s,
1670                 SSL3_ST_SR_KEY_EXCH_A,
1671                 SSL3_ST_SR_KEY_EXCH_B,
1672                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1673                 2048, /* ??? */
1674                 &ok);
1675
1676         if (!ok) return((int)n);
1677         p=(unsigned char *)s->init_msg;
1678
1679         l=s->s3->tmp.new_cipher->algorithms;
1680
1681 #ifndef OPENSSL_NO_RSA
1682         if (l & SSL_kRSA)
1683                 {
1684                 /* FIX THIS UP EAY EAY EAY EAY */
1685                 if (s->s3->tmp.use_rsa_tmp)
1686                         {
1687                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1688                                 rsa=s->cert->rsa_tmp;
1689                         /* Don't do a callback because rsa_tmp should
1690                          * be sent already */
1691                         if (rsa == NULL)
1692                                 {
1693                                 al=SSL_AD_HANDSHAKE_FAILURE;
1694                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1695                                 goto f_err;
1696
1697                                 }
1698                         }
1699                 else
1700                         {
1701                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1702                         if (    (pkey == NULL) ||
1703                                 (pkey->type != EVP_PKEY_RSA) ||
1704                                 (pkey->pkey.rsa == NULL))
1705                                 {
1706                                 al=SSL_AD_HANDSHAKE_FAILURE;
1707                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1708                                 goto f_err;
1709                                 }
1710                         rsa=pkey->pkey.rsa;
1711                         }
1712
1713                 /* TLS */
1714                 if (s->version > SSL3_VERSION)
1715                         {
1716                         n2s(p,i);
1717                         if (n != i+2)
1718                                 {
1719                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1720                                         {
1721                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1722                                         goto err;
1723                                         }
1724                                 else
1725                                         p-=2;
1726                                 }
1727                         else
1728                                 n=i;
1729                         }
1730
1731                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1732
1733                 al = -1;
1734                 
1735                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1736                         {
1737                         al=SSL_AD_DECODE_ERROR;
1738                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1739                         }
1740
1741                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1742                         {
1743                         /* The premaster secret must contain the same version number as the
1744                          * ClientHello to detect version rollback attacks (strangely, the
1745                          * protocol does not offer such protection for DH ciphersuites).
1746                          * However, buggy clients exist that send the negotiated protocol
1747                          * version instead if the server does not support the requested
1748                          * protocol version.
1749                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1750                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1751                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1752                                 {
1753                                 al=SSL_AD_DECODE_ERROR;
1754                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1755
1756                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1757                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1758                                  * number check as a "bad version oracle" -- an alert would
1759                                  * reveal that the plaintext corresponding to some ciphertext
1760                                  * made up by the adversary is properly formatted except
1761                                  * that the version number is wrong.  To avoid such attacks,
1762                                  * we should treat this just like any other decryption error. */
1763                                 }
1764                         }
1765
1766                 if (al != -1)
1767                         {
1768                         /* Some decryption failure -- use random value instead as countermeasure
1769                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1770                          * (see RFC 2246, section 7.4.7.1). */
1771                         ERR_clear_error();
1772                         i = SSL_MAX_MASTER_KEY_LENGTH;
1773                         p[0] = s->client_version >> 8;
1774                         p[1] = s->client_version & 0xff;
1775                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1776                                 goto err;
1777                         }
1778         
1779                 s->session->master_key_length=
1780                         s->method->ssl3_enc->generate_master_secret(s,
1781                                 s->session->master_key,
1782                                 p,i);
1783                 OPENSSL_cleanse(p,i);
1784                 }
1785         else
1786 #endif
1787 #ifndef OPENSSL_NO_DH
1788                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1789                 {
1790                 n2s(p,i);
1791                 if (n != i+2)
1792                         {
1793                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1794                                 {
1795                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1796                                 goto err;
1797                                 }
1798                         else
1799                                 {
1800                                 p-=2;
1801                                 i=(int)n;
1802                                 }
1803                         }
1804
1805                 if (n == 0L) /* the parameters are in the cert */
1806                         {
1807                         al=SSL_AD_HANDSHAKE_FAILURE;
1808                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1809                         goto f_err;
1810                         }
1811                 else
1812                         {
1813                         if (s->s3->tmp.dh == NULL)
1814                                 {
1815                                 al=SSL_AD_HANDSHAKE_FAILURE;
1816                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1817                                 goto f_err;
1818                                 }
1819                         else
1820                                 dh_srvr=s->s3->tmp.dh;
1821                         }
1822
1823                 pub=BN_bin2bn(p,i,NULL);
1824                 if (pub == NULL)
1825                         {
1826                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1827                         goto err;
1828                         }
1829
1830                 i=DH_compute_key(p,pub,dh_srvr);
1831
1832                 if (i <= 0)
1833                         {
1834                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1835                         goto err;
1836                         }
1837
1838                 DH_free(s->s3->tmp.dh);
1839                 s->s3->tmp.dh=NULL;
1840
1841                 BN_clear_free(pub);
1842                 pub=NULL;
1843                 s->session->master_key_length=
1844                         s->method->ssl3_enc->generate_master_secret(s,
1845                                 s->session->master_key,p,i);
1846                 OPENSSL_cleanse(p,i);
1847                 }
1848         else
1849 #endif
1850 #ifndef OPENSSL_NO_KRB5
1851         if (l & SSL_kKRB5)
1852                 {
1853                 krb5_error_code         krb5rc;
1854                 krb5_data               enc_ticket;
1855                 krb5_data               authenticator;
1856                 krb5_data               enc_pms;
1857                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1858                 EVP_CIPHER_CTX          ciph_ctx;
1859                 EVP_CIPHER              *enc = NULL;
1860                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1861                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1862                                                + EVP_MAX_BLOCK_LENGTH];
1863                 int                     padl, outl;
1864                 krb5_timestamp          authtime = 0;
1865                 krb5_ticket_times       ttimes;
1866
1867                 EVP_CIPHER_CTX_init(&ciph_ctx);
1868
1869                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1870
1871                 n2s(p,i);
1872                 enc_ticket.length = i;
1873
1874                 if (n < (int)enc_ticket.length + 6)
1875                         {
1876                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1877                                 SSL_R_DATA_LENGTH_TOO_LONG);
1878                         goto err;
1879                         }
1880
1881                 enc_ticket.data = (char *)p;
1882                 p+=enc_ticket.length;
1883
1884                 n2s(p,i);
1885                 authenticator.length = i;
1886
1887                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
1888                         {
1889                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1890                                 SSL_R_DATA_LENGTH_TOO_LONG);
1891                         goto err;
1892                         }
1893
1894                 authenticator.data = (char *)p;
1895                 p+=authenticator.length;
1896
1897                 n2s(p,i);
1898                 enc_pms.length = i;
1899                 enc_pms.data = (char *)p;
1900                 p+=enc_pms.length;
1901
1902                 /* Note that the length is checked again below,
1903                 ** after decryption
1904                 */
1905                 if(enc_pms.length > sizeof pms)
1906                         {
1907                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1908                                SSL_R_DATA_LENGTH_TOO_LONG);
1909                         goto err;
1910                         }
1911
1912                 if (n != (long)(enc_ticket.length + authenticator.length +
1913                                                 enc_pms.length + 6))
1914                         {
1915                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1916                                 SSL_R_DATA_LENGTH_TOO_LONG);
1917                         goto err;
1918                         }
1919
1920                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1921                                         &kssl_err)) != 0)
1922                         {
1923 #ifdef KSSL_DEBUG
1924                         printf("kssl_sget_tkt rtn %d [%d]\n",
1925                                 krb5rc, kssl_err.reason);
1926                         if (kssl_err.text)
1927                                 printf("kssl_err text= %s\n", kssl_err.text);
1928 #endif  /* KSSL_DEBUG */
1929                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1930                                 kssl_err.reason);
1931                         goto err;
1932                         }
1933
1934                 /*  Note: no authenticator is not considered an error,
1935                 **  but will return authtime == 0.
1936                 */
1937                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1938                                         &authtime, &kssl_err)) != 0)
1939                         {
1940 #ifdef KSSL_DEBUG
1941                         printf("kssl_check_authent rtn %d [%d]\n",
1942                                 krb5rc, kssl_err.reason);
1943                         if (kssl_err.text)
1944                                 printf("kssl_err text= %s\n", kssl_err.text);
1945 #endif  /* KSSL_DEBUG */
1946                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1947                                 kssl_err.reason);
1948                         goto err;
1949                         }
1950
1951                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1952                         {
1953                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
1954                         goto err;
1955                         }
1956
1957 #ifdef KSSL_DEBUG
1958                 kssl_ctx_show(kssl_ctx);
1959 #endif  /* KSSL_DEBUG */
1960
1961                 enc = kssl_map_enc(kssl_ctx->enctype);
1962                 if (enc == NULL)
1963                     goto err;
1964
1965                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
1966
1967                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1968                         {
1969                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1970                                 SSL_R_DECRYPTION_FAILED);
1971                         goto err;
1972                         }
1973                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1974                                         (unsigned char *)enc_pms.data, enc_pms.length))
1975                         {
1976                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1977                                 SSL_R_DECRYPTION_FAILED);
1978                         goto err;
1979                         }
1980                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1981                         {
1982                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1983                                 SSL_R_DATA_LENGTH_TOO_LONG);
1984                         goto err;
1985                         }
1986                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1987                         {
1988                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1989                                 SSL_R_DECRYPTION_FAILED);
1990                         goto err;
1991                         }
1992                 outl += padl;
1993                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1994                         {
1995                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1996                                 SSL_R_DATA_LENGTH_TOO_LONG);
1997                         goto err;
1998                         }
1999                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2000                     {
2001                     /* The premaster secret must contain the same version number as the
2002                      * ClientHello to detect version rollback attacks (strangely, the
2003                      * protocol does not offer such protection for DH ciphersuites).
2004                      * However, buggy clients exist that send random bytes instead of
2005                      * the protocol version.
2006                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2007                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2008                      */
2009                     if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2010                            (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2011                         {
2012                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2013                                SSL_AD_DECODE_ERROR);
2014                         goto err;
2015                         }
2016                     }
2017
2018                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2019
2020                 s->session->master_key_length=
2021                         s->method->ssl3_enc->generate_master_secret(s,
2022                                 s->session->master_key, pms, outl);
2023
2024                 if (kssl_ctx->client_princ)
2025                         {
2026                         size_t len = strlen(kssl_ctx->client_princ);
2027                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2028                                 {
2029                                 s->session->krb5_client_princ_len = len;
2030                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2031                                 }
2032                         }
2033
2034
2035                 /*  Was doing kssl_ctx_free() here,
2036                 **  but it caused problems for apache.
2037                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2038                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2039                 */
2040                 }
2041         else
2042 #endif  /* OPENSSL_NO_KRB5 */
2043
2044 #ifndef OPENSSL_NO_ECDH
2045                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2046                 {
2047                 int ret = 1;
2048                 int field_size = 0;
2049                 const EC_KEY   *tkey;
2050                 const EC_GROUP *group;
2051                 const BIGNUM *priv_key;
2052
2053                 /* initialize structures for server's ECDH key pair */
2054                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2055                         {
2056                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2057                             ERR_R_MALLOC_FAILURE);
2058                         goto err;
2059                         }
2060
2061                 /* Let's get server private key and group information */
2062                 if (l & SSL_kECDH) 
2063                         { 
2064                         /* use the certificate */
2065                         tkey = s->cert->key->privatekey->pkey.ec;
2066                         }
2067                 else
2068                         {
2069                         /* use the ephermeral values we saved when
2070                          * generating the ServerKeyExchange msg.
2071                          */
2072                         tkey = s->s3->tmp.ecdh;
2073                         }
2074
2075                 group    = EC_KEY_get0_group(tkey);
2076                 priv_key = EC_KEY_get0_private_key(tkey);
2077
2078                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2079                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2080                         {
2081                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2082                                ERR_R_EC_LIB);
2083                         goto err;
2084                         }
2085
2086                 /* Let's get client's public key */
2087                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2088                         {
2089                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2090                             ERR_R_MALLOC_FAILURE);
2091                         goto err;
2092                         }
2093
2094                 if (n == 0L) 
2095                         {
2096                         /* Client Publickey was in Client Certificate */
2097
2098                          if (l & SSL_kECDHE) 
2099                                  {
2100                                  al=SSL_AD_HANDSHAKE_FAILURE;
2101                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2102                                  goto f_err;
2103                                  }
2104                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2105                             == NULL) || 
2106                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2107                                 {
2108                                 /* XXX: For now, we do not support client
2109                                  * authentication using ECDH certificates
2110                                  * so this branch (n == 0L) of the code is
2111                                  * never executed. When that support is
2112                                  * added, we ought to ensure the key 
2113                                  * received in the certificate is 
2114                                  * authorized for key agreement.
2115                                  * ECDH_compute_key implicitly checks that
2116                                  * the two ECDH shares are for the same
2117                                  * group.
2118                                  */
2119                                 al=SSL_AD_HANDSHAKE_FAILURE;
2120                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2121                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2122                                 goto f_err;
2123                                 }
2124
2125                         if (EC_POINT_copy(clnt_ecpoint,
2126                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2127                                 {
2128                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2129                                         ERR_R_EC_LIB);
2130                                 goto err;
2131                                 }
2132                         ret = 2; /* Skip certificate verify processing */
2133                         }
2134                 else
2135                         {
2136                         /* Get client's public key from encoded point
2137                          * in the ClientKeyExchange message.
2138                          */
2139                         if ((bn_ctx = BN_CTX_new()) == NULL)
2140                                 {
2141                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2142                                     ERR_R_MALLOC_FAILURE);
2143                                 goto err;
2144                                 }
2145
2146                         /* Get encoded point length */
2147                         i = *p; 
2148                         p += 1;
2149                         if (EC_POINT_oct2point(group, 
2150                             clnt_ecpoint, p, i, bn_ctx) == 0)
2151                                 {
2152                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2153                                     ERR_R_EC_LIB);
2154                                 goto err;
2155                                 }
2156                         /* p is pointing to somewhere in the buffer
2157                          * currently, so set it to the start 
2158                          */ 
2159                         p=(unsigned char *)s->init_buf->data;
2160                         }
2161
2162                 /* Compute the shared pre-master secret */
2163                 field_size = EC_GROUP_get_degree(group);
2164                 if (field_size <= 0)
2165                         {
2166                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2167                                ERR_R_ECDH_LIB);
2168                         goto err;
2169                         }
2170                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2171                 if (i <= 0)
2172                         {
2173                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2174                             ERR_R_ECDH_LIB);
2175                         goto err;
2176                         }
2177
2178                 EVP_PKEY_free(clnt_pub_pkey);
2179                 EC_POINT_free(clnt_ecpoint);
2180                 if (srvr_ecdh != NULL) 
2181                         EC_KEY_free(srvr_ecdh);
2182                 BN_CTX_free(bn_ctx);
2183
2184                 /* Compute the master secret */
2185                 s->session->master_key_length = s->method->ssl3_enc-> \
2186                     generate_master_secret(s, s->session->master_key, p, i);
2187                 
2188                 OPENSSL_cleanse(p, i);
2189                 return (ret);
2190                 }
2191         else
2192 #endif
2193                 {
2194                 al=SSL_AD_HANDSHAKE_FAILURE;
2195                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2196                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2197                 goto f_err;
2198                 }
2199
2200         return(1);
2201 f_err:
2202         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2203 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2204 err:
2205 #endif
2206 #ifndef OPENSSL_NO_ECDH
2207         EVP_PKEY_free(clnt_pub_pkey);
2208         EC_POINT_free(clnt_ecpoint);
2209         if (srvr_ecdh != NULL) 
2210                 EC_KEY_free(srvr_ecdh);
2211         BN_CTX_free(bn_ctx);
2212 #endif
2213         return(-1);
2214         }
2215
2216 int ssl3_get_cert_verify(SSL *s)
2217         {
2218         EVP_PKEY *pkey=NULL;
2219         unsigned char *p;
2220         int al,ok,ret=0;
2221         long n;
2222         int type=0,i,j;
2223         X509 *peer;
2224
2225         n=s->method->ssl_get_message(s,
2226                 SSL3_ST_SR_CERT_VRFY_A,
2227                 SSL3_ST_SR_CERT_VRFY_B,
2228                 -1,
2229                 514, /* 514? */
2230                 &ok);
2231
2232         if (!ok) return((int)n);
2233
2234         if (s->session->peer != NULL)
2235                 {
2236                 peer=s->session->peer;
2237                 pkey=X509_get_pubkey(peer);
2238                 type=X509_certificate_type(peer,pkey);
2239                 }
2240         else
2241                 {
2242                 peer=NULL;
2243                 pkey=NULL;
2244                 }
2245
2246         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2247                 {
2248                 s->s3->tmp.reuse_message=1;
2249                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2250                         {
2251                         al=SSL_AD_UNEXPECTED_MESSAGE;
2252                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2253                         goto f_err;
2254                         }
2255                 ret=1;
2256                 goto end;
2257                 }
2258
2259         if (peer == NULL)
2260                 {
2261                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2262                 al=SSL_AD_UNEXPECTED_MESSAGE;
2263                 goto f_err;
2264                 }
2265
2266         if (!(type & EVP_PKT_SIGN))
2267                 {
2268                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2269                 al=SSL_AD_ILLEGAL_PARAMETER;
2270                 goto f_err;
2271                 }
2272
2273         if (s->s3->change_cipher_spec)
2274                 {
2275                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2276                 al=SSL_AD_UNEXPECTED_MESSAGE;
2277                 goto f_err;
2278                 }
2279
2280         /* we now have a signature that we need to verify */
2281         p=(unsigned char *)s->init_msg;
2282         n2s(p,i);
2283         n-=2;
2284         if (i > n)
2285                 {
2286                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2287                 al=SSL_AD_DECODE_ERROR;
2288                 goto f_err;
2289                 }
2290
2291         j=EVP_PKEY_size(pkey);
2292         if ((i > j) || (n > j) || (n <= 0))
2293                 {
2294                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2295                 al=SSL_AD_DECODE_ERROR;
2296                 goto f_err;
2297                 }
2298
2299 #ifndef OPENSSL_NO_RSA 
2300         if (pkey->type == EVP_PKEY_RSA)
2301                 {
2302                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2303                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
2304                                                         pkey->pkey.rsa);
2305                 if (i < 0)
2306                         {
2307                         al=SSL_AD_DECRYPT_ERROR;
2308                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2309                         goto f_err;
2310                         }
2311                 if (i == 0)
2312                         {
2313                         al=SSL_AD_DECRYPT_ERROR;
2314                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2315                         goto f_err;
2316                         }
2317                 }
2318         else
2319 #endif
2320 #ifndef OPENSSL_NO_DSA
2321                 if (pkey->type == EVP_PKEY_DSA)
2322                 {
2323                 j=DSA_verify(pkey->save_type,
2324                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2325                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2326                 if (j <= 0)
2327                         {
2328                         /* bad signature */
2329                         al=SSL_AD_DECRYPT_ERROR;
2330                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2331                         goto f_err;
2332                         }
2333                 }
2334         else
2335 #endif
2336 #ifndef OPENSSL_NO_ECDSA
2337                 if (pkey->type == EVP_PKEY_EC)
2338                 {
2339                 j=ECDSA_verify(pkey->save_type,
2340                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2341                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2342                 if (j <= 0)
2343                         {
2344                         /* bad signature */
2345                         al=SSL_AD_DECRYPT_ERROR;
2346                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2347                             SSL_R_BAD_ECDSA_SIGNATURE);
2348                         goto f_err;
2349                         }
2350                 }
2351         else
2352 #endif
2353                 {
2354                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2355                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2356                 goto f_err;
2357                 }
2358
2359
2360         ret=1;
2361         if (0)
2362                 {
2363 f_err:
2364                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2365                 }
2366 end:
2367         EVP_PKEY_free(pkey);
2368         return(ret);
2369         }
2370
2371 int ssl3_get_client_certificate(SSL *s)
2372         {
2373         int i,ok,al,ret= -1;
2374         X509 *x=NULL;
2375         unsigned long l,nc,llen,n;
2376         const unsigned char *p,*q;
2377         unsigned char *d;
2378         STACK_OF(X509) *sk=NULL;
2379
2380         n=s->method->ssl_get_message(s,
2381                 SSL3_ST_SR_CERT_A,
2382                 SSL3_ST_SR_CERT_B,
2383                 -1,
2384                 s->max_cert_list,
2385                 &ok);
2386
2387         if (!ok) return((int)n);
2388
2389         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2390                 {
2391                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2392                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2393                         {
2394                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2395                         al=SSL_AD_HANDSHAKE_FAILURE;
2396                         goto f_err;
2397                         }
2398                 /* If tls asked for a client cert, the client must return a 0 list */
2399                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2400                         {
2401                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2402                         al=SSL_AD_UNEXPECTED_MESSAGE;
2403                         goto f_err;
2404                         }
2405                 s->s3->tmp.reuse_message=1;
2406                 return(1);
2407                 }
2408
2409         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2410                 {
2411                 al=SSL_AD_UNEXPECTED_MESSAGE;
2412                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2413                 goto f_err;
2414                 }
2415         p=d=(unsigned char *)s->init_msg;
2416
2417         if ((sk=sk_X509_new_null()) == NULL)
2418                 {
2419                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2420                 goto err;
2421                 }
2422
2423         n2l3(p,llen);
2424         if (llen+3 != n)
2425                 {
2426                 al=SSL_AD_DECODE_ERROR;
2427                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2428                 goto f_err;
2429                 }
2430         for (nc=0; nc<llen; )
2431                 {
2432                 n2l3(p,l);
2433                 if ((l+nc+3) > llen)
2434                         {
2435                         al=SSL_AD_DECODE_ERROR;
2436                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2437                         goto f_err;
2438                         }
2439
2440                 q=p;
2441                 x=d2i_X509(NULL,&p,l);
2442                 if (x == NULL)
2443                         {
2444                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2445                         goto err;
2446                         }
2447                 if (p != (q+l))
2448                         {
2449                         al=SSL_AD_DECODE_ERROR;
2450                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2451                         goto f_err;
2452                         }
2453                 if (!sk_X509_push(sk,x))
2454                         {
2455                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2456                         goto err;
2457                         }
2458                 x=NULL;
2459                 nc+=l+3;
2460                 }
2461
2462         if (sk_X509_num(sk) <= 0)
2463                 {
2464                 /* TLS does not mind 0 certs returned */
2465                 if (s->version == SSL3_VERSION)
2466                         {
2467                         al=SSL_AD_HANDSHAKE_FAILURE;
2468                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2469                         goto f_err;
2470                         }
2471                 /* Fail for TLS only if we required a certificate */
2472                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2473                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2474                         {
2475                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2476                         al=SSL_AD_HANDSHAKE_FAILURE;
2477                         goto f_err;
2478                         }
2479                 }
2480         else
2481                 {
2482                 i=ssl_verify_cert_chain(s,sk);
2483                 if (!i)
2484                         {
2485                         al=ssl_verify_alarm_type(s->verify_result);
2486                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2487                         goto f_err;
2488                         }
2489                 }
2490
2491         if (s->session->peer != NULL) /* This should not be needed */
2492                 X509_free(s->session->peer);
2493         s->session->peer=sk_X509_shift(sk);
2494         s->session->verify_result = s->verify_result;
2495
2496         /* With the current implementation, sess_cert will always be NULL
2497          * when we arrive here. */
2498         if (s->session->sess_cert == NULL)
2499                 {
2500                 s->session->sess_cert = ssl_sess_cert_new();
2501                 if (s->session->sess_cert == NULL)
2502                         {
2503                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2504                         goto err;
2505                         }
2506                 }
2507         if (s->session->sess_cert->cert_chain != NULL)
2508                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2509         s->session->sess_cert->cert_chain=sk;
2510         /* Inconsistency alert: cert_chain does *not* include the
2511          * peer's own certificate, while we do include it in s3_clnt.c */
2512
2513         sk=NULL;
2514
2515         ret=1;
2516         if (0)
2517                 {
2518 f_err:
2519                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2520                 }
2521 err:
2522         if (x != NULL) X509_free(x);
2523         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2524         return(ret);
2525         }
2526
2527 int ssl3_send_server_certificate(SSL *s)
2528         {
2529         unsigned long l;
2530         X509 *x;
2531
2532         if (s->state == SSL3_ST_SW_CERT_A)
2533                 {
2534                 x=ssl_get_server_send_cert(s);
2535                 if (x == NULL &&
2536                         /* VRS: allow null cert if auth == KRB5 */
2537                         (s->s3->tmp.new_cipher->algorithms
2538                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2539                         != (SSL_aKRB5|SSL_kKRB5))
2540                         {
2541                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2542                         return(0);
2543                         }
2544
2545                 l=ssl3_output_cert_chain(s,x);
2546                 s->state=SSL3_ST_SW_CERT_B;
2547                 s->init_num=(int)l;
2548                 s->init_off=0;
2549                 }
2550
2551         /* SSL3_ST_SW_CERT_B */
2552         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2553         }
2554
2555
2556 #ifndef OPENSSL_NO_ECDH
2557 /* This is the complement of curve_id2nid in s3_clnt.c. */
2558 static int nid2curve_id(int nid)
2559 {
2560         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2561          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2562         switch (nid) {
2563         case NID_sect163k1: /* sect163k1 (1) */
2564                 return 1;
2565         case NID_sect163r1: /* sect163r1 (2) */
2566                 return 2;
2567         case NID_sect163r2: /* sect163r2 (3) */
2568                 return 3;
2569         case NID_sect193r1: /* sect193r1 (4) */ 
2570                 return 4;
2571         case NID_sect193r2: /* sect193r2 (5) */ 
2572                 return 5;
2573         case NID_sect233k1: /* sect233k1 (6) */
2574                 return 6;
2575         case NID_sect233r1: /* sect233r1 (7) */ 
2576                 return 7;
2577         case NID_sect239k1: /* sect239k1 (8) */ 
2578                 return 8;
2579         case NID_sect283k1: /* sect283k1 (9) */
2580                 return 9;
2581         case NID_sect283r1: /* sect283r1 (10) */ 
2582                 return 10;
2583         case NID_sect409k1: /* sect409k1 (11) */ 
2584                 return 11;
2585         case NID_sect409r1: /* sect409r1 (12) */
2586                 return 12;
2587         case NID_sect571k1: /* sect571k1 (13) */ 
2588                 return 13;
2589         case NID_sect571r1: /* sect571r1 (14) */ 
2590                 return 14;
2591         case NID_secp160k1: /* secp160k1 (15) */
2592                 return 15;
2593         case NID_secp160r1: /* secp160r1 (16) */ 
2594                 return 16;
2595         case NID_secp160r2: /* secp160r2 (17) */ 
2596                 return 17;
2597         case NID_secp192k1: /* secp192k1 (18) */
2598                 return 18;
2599         case NID_X9_62_prime192v1: /* secp192r1 (19) */ 
2600                 return 19;
2601         case NID_secp224k1: /* secp224k1 (20) */ 
2602                 return 20;
2603         case NID_secp224r1: /* secp224r1 (21) */
2604                 return 21;
2605         case NID_secp256k1: /* secp256k1 (22) */ 
2606                 return 22;
2607         case NID_X9_62_prime256v1: /* secp256r1 (23) */ 
2608                 return 23;
2609         case NID_secp384r1: /* secp384r1 (24) */
2610                 return 24;
2611         case NID_secp521r1:  /* secp521r1 (25) */       
2612                 return 25;
2613         default:
2614                 return 0;
2615         }
2616 }
2617 #endif