fix support for receiving fragmented handshake messages
[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->state=SSL3_ST_SR_CLNT_HELLO_B;
684                 }
685         s->first_packet=1;
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         s->first_packet=0;
695         d=p=(unsigned char *)s->init_msg;
696
697         /* use version from inside client hello, not from record header
698          * (may differ: see RFC 2246, Appendix E, second paragraph) */
699         s->client_version=(((int)p[0])<<8)|(int)p[1];
700         p+=2;
701
702         if (s->client_version < s->version)
703                 {
704                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
705                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR) 
706                         {
707                         /* similar to ssl3_get_record, send alert using remote version number */
708                         s->version = s->client_version;
709                         }
710                 al = SSL_AD_PROTOCOL_VERSION;
711                 goto f_err;
712                 }
713
714         /* load the client random */
715         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
716         p+=SSL3_RANDOM_SIZE;
717
718         /* get the session-id */
719         j= *(p++);
720
721         s->hit=0;
722         /* Versions before 0.9.7 always allow session reuse during renegotiation
723          * (i.e. when s->new_session is true), option
724          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
725          * Maybe this optional behaviour should always have been the default,
726          * but we cannot safely change the default behaviour (or new applications
727          * might be written that become totally unsecure when compiled with
728          * an earlier library version)
729          */
730         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
731                 {
732                 if (!ssl_get_new_session(s,1))
733                         goto err;
734                 }
735         else
736                 {
737                 i=ssl_get_prev_session(s,p,j);
738                 if (i == 1)
739                         { /* previous session */
740                         s->hit=1;
741                         }
742                 else if (i == -1)
743                         goto err;
744                 else /* i == 0 */
745                         {
746                         if (!ssl_get_new_session(s,1))
747                                 goto err;
748                         }
749                 }
750
751         p+=j;
752
753         if (SSL_version(s) == DTLS1_VERSION)
754                 {
755                 /* cookie stuff */
756                 cookie_len = *(p++);
757
758                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
759                         s->d1->send_cookie == 0)
760                         {
761                         /* HelloVerifyMessage has already been sent */
762                         if ( cookie_len != s->d1->cookie_len)
763                                 {
764                                 al = SSL_AD_HANDSHAKE_FAILURE;
765                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
766                                 goto f_err;
767                                 }
768                         }
769
770                 /* 
771                  * The ClientHello may contain a cookie even if the
772                  * HelloVerify message has not been sent--make sure that it
773                  * does not cause an overflow.
774                  */
775                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
776                         {
777                         /* too much data */
778                         al = SSL_AD_DECODE_ERROR;
779                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
780                         goto f_err;
781                         }
782
783                 /* verify the cookie if appropriate option is set. */
784                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
785                         cookie_len > 0)
786                         {
787                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
788
789                         if ( s->ctx->app_verify_cookie_cb != NULL)
790                                 {
791                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
792                                         cookie_len) == 0)
793                                         {
794                                         al=SSL_AD_HANDSHAKE_FAILURE;
795                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
796                                                 SSL_R_COOKIE_MISMATCH);
797                                         goto f_err;
798                                         }
799                                 /* else cookie verification succeeded */
800                                 }
801                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
802                                                   s->d1->cookie_len) != 0) /* default verification */
803                                 {
804                                         al=SSL_AD_HANDSHAKE_FAILURE;
805                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
806                                                 SSL_R_COOKIE_MISMATCH);
807                                         goto f_err;
808                                 }
809                         }
810
811                 p += cookie_len;
812                 }
813
814         n2s(p,i);
815         if ((i == 0) && (j != 0))
816                 {
817                 /* we need a cipher if we are not resuming a session */
818                 al=SSL_AD_ILLEGAL_PARAMETER;
819                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
820                 goto f_err;
821                 }
822         if ((p+i) >= (d+n))
823                 {
824                 /* not enough data */
825                 al=SSL_AD_DECODE_ERROR;
826                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
827                 goto f_err;
828                 }
829         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
830                 == NULL))
831                 {
832                 goto err;
833                 }
834         p+=i;
835
836         /* If it is a hit, check that the cipher is in the list */
837         if ((s->hit) && (i > 0))
838                 {
839                 j=0;
840                 id=s->session->cipher->id;
841
842 #ifdef CIPHER_DEBUG
843                 printf("client sent %d ciphers\n",sk_num(ciphers));
844 #endif
845                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
846                         {
847                         c=sk_SSL_CIPHER_value(ciphers,i);
848 #ifdef CIPHER_DEBUG
849                         printf("client [%2d of %2d]:%s\n",
850                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
851 #endif
852                         if (c->id == id)
853                                 {
854                                 j=1;
855                                 break;
856                                 }
857                         }
858                 if (j == 0)
859                         {
860                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
861                                 {
862                                 /* Very bad for multi-threading.... */
863                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers, 0);
864                                 }
865                         else
866                                 {
867                                 /* we need to have the cipher in the cipher
868                                  * list if we are asked to reuse it */
869                                 al=SSL_AD_ILLEGAL_PARAMETER;
870                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
871                                 goto f_err;
872                                 }
873                         }
874                 }
875
876         /* compression */
877         i= *(p++);
878         if ((p+i) > (d+n))
879                 {
880                 /* not enough data */
881                 al=SSL_AD_DECODE_ERROR;
882                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
883                 goto f_err;
884                 }
885         q=p;
886         for (j=0; j<i; j++)
887                 {
888                 if (p[j] == 0) break;
889                 }
890
891         p+=i;
892         if (j >= i)
893                 {
894                 /* no compress */
895                 al=SSL_AD_DECODE_ERROR;
896                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
897                 goto f_err;
898                 }
899
900         /* Worst case, we will use the NULL compression, but if we have other
901          * options, we will now look for them.  We have i-1 compression
902          * algorithms from the client, starting at q. */
903         s->s3->tmp.new_compression=NULL;
904 #ifndef OPENSSL_NO_COMP
905         if (s->ctx->comp_methods != NULL)
906                 { /* See if we have a match */
907                 int m,nn,o,v,done=0;
908
909                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
910                 for (m=0; m<nn; m++)
911                         {
912                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
913                         v=comp->id;
914                         for (o=0; o<i; o++)
915                                 {
916                                 if (v == q[o])
917                                         {
918                                         done=1;
919                                         break;
920                                         }
921                                 }
922                         if (done) break;
923                         }
924                 if (done)
925                         s->s3->tmp.new_compression=comp;
926                 else
927                         comp=NULL;
928                 }
929 #endif
930
931         /* TLS does not mind if there is extra stuff */
932 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
933          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
934          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
935         if (s->version == SSL3_VERSION)
936                 {
937                 if (p < (d+n))
938                         {
939                         /* wrong number of bytes,
940                          * there could be more to follow */
941                         al=SSL_AD_DECODE_ERROR;
942                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
943                         goto f_err;
944                         }
945                 }
946 #endif
947
948         /* Given s->session->ciphers and SSL_get_ciphers, we must
949          * pick a cipher */
950
951         if (!s->hit)
952                 {
953 #ifdef OPENSSL_NO_COMP
954                 s->session->compress_meth=0;
955 #else
956                 s->session->compress_meth=(comp == NULL)?0:comp->id;
957 #endif
958                 if (s->session->ciphers != NULL)
959                         sk_SSL_CIPHER_free(s->session->ciphers);
960                 s->session->ciphers=ciphers;
961                 if (ciphers == NULL)
962                         {
963                         al=SSL_AD_ILLEGAL_PARAMETER;
964                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
965                         goto f_err;
966                         }
967                 ciphers=NULL;
968                 c=ssl3_choose_cipher(s,s->session->ciphers,
969                                      SSL_get_ciphers(s));
970
971                 if (c == NULL)
972                         {
973                         al=SSL_AD_HANDSHAKE_FAILURE;
974                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
975                         goto f_err;
976                         }
977                 s->s3->tmp.new_cipher=c;
978                 }
979         else
980                 {
981                 /* Session-id reuse */
982 #ifdef REUSE_CIPHER_BUG
983                 STACK_OF(SSL_CIPHER) *sk;
984                 SSL_CIPHER *nc=NULL;
985                 SSL_CIPHER *ec=NULL;
986
987                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
988                         {
989                         sk=s->session->ciphers;
990                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
991                                 {
992                                 c=sk_SSL_CIPHER_value(sk,i);
993                                 if (c->algorithms & SSL_eNULL)
994                                         nc=c;
995                                 if (SSL_C_IS_EXPORT(c))
996                                         ec=c;
997                                 }
998                         if (nc != NULL)
999                                 s->s3->tmp.new_cipher=nc;
1000                         else if (ec != NULL)
1001                                 s->s3->tmp.new_cipher=ec;
1002                         else
1003                                 s->s3->tmp.new_cipher=s->session->cipher;
1004                         }
1005                 else
1006 #endif
1007                 s->s3->tmp.new_cipher=s->session->cipher;
1008                 }
1009         
1010         /* we now have the following setup. 
1011          * client_random
1012          * cipher_list          - our prefered list of ciphers
1013          * ciphers              - the clients prefered list of ciphers
1014          * compression          - basically ignored right now
1015          * ssl version is set   - sslv3
1016          * s->session           - The ssl session has been setup.
1017          * s->hit               - session reuse flag
1018          * s->tmp.new_cipher    - the new cipher to use.
1019          */
1020
1021         ret=1;
1022         if (0)
1023                 {
1024 f_err:
1025                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1026                 }
1027 err:
1028         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1029         return(ret);
1030         }
1031
1032 int ssl3_send_server_hello(SSL *s)
1033         {
1034         unsigned char *buf;
1035         unsigned char *p,*d;
1036         int i,sl;
1037         unsigned long l,Time;
1038
1039         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1040                 {
1041                 buf=(unsigned char *)s->init_buf->data;
1042                 p=s->s3->server_random;
1043                 Time=(unsigned long)time(NULL);                 /* Time */
1044                 l2n(Time,p);
1045                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1046                         return -1;
1047                 /* Do the message type and length last */
1048                 d=p= &(buf[4]);
1049
1050                 *(p++)=s->version>>8;
1051                 *(p++)=s->version&0xff;
1052
1053                 /* Random stuff */
1054                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1055                 p+=SSL3_RANDOM_SIZE;
1056
1057                 /* now in theory we have 3 options to sending back the
1058                  * session id.  If it is a re-use, we send back the
1059                  * old session-id, if it is a new session, we send
1060                  * back the new session-id or we send back a 0 length
1061                  * session-id if we want it to be single use.
1062                  * Currently I will not implement the '0' length session-id
1063                  * 12-Jan-98 - I'll now support the '0' length stuff.
1064                  */
1065                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1066                         s->session->session_id_length=0;
1067
1068                 sl=s->session->session_id_length;
1069                 if (sl > (int)sizeof(s->session->session_id))
1070                         {
1071                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1072                         return -1;
1073                         }
1074                 *(p++)=sl;
1075                 memcpy(p,s->session->session_id,sl);
1076                 p+=sl;
1077
1078                 /* put the cipher */
1079                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1080                 p+=i;
1081
1082                 /* put the compression method */
1083 #ifdef OPENSSL_NO_COMP
1084                         *(p++)=0;
1085 #else
1086                 if (s->s3->tmp.new_compression == NULL)
1087                         *(p++)=0;
1088                 else
1089                         *(p++)=s->s3->tmp.new_compression->id;
1090 #endif
1091
1092                 /* do the header */
1093                 l=(p-d);
1094                 d=buf;
1095                 *(d++)=SSL3_MT_SERVER_HELLO;
1096                 l2n3(l,d);
1097
1098                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1099                 /* number of bytes to write */
1100                 s->init_num=p-buf;
1101                 s->init_off=0;
1102                 }
1103
1104         /* SSL3_ST_CW_CLNT_HELLO_B */
1105         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1106         }
1107
1108 int ssl3_send_server_done(SSL *s)
1109         {
1110         unsigned char *p;
1111
1112         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1113                 {
1114                 p=(unsigned char *)s->init_buf->data;
1115
1116                 /* do the header */
1117                 *(p++)=SSL3_MT_SERVER_DONE;
1118                 *(p++)=0;
1119                 *(p++)=0;
1120                 *(p++)=0;
1121
1122                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1123                 /* number of bytes to write */
1124                 s->init_num=4;
1125                 s->init_off=0;
1126                 }
1127
1128         /* SSL3_ST_CW_CLNT_HELLO_B */
1129         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1130         }
1131
1132 int ssl3_send_server_key_exchange(SSL *s)
1133         {
1134 #ifndef OPENSSL_NO_RSA
1135         unsigned char *q;
1136         int j,num;
1137         RSA *rsa;
1138         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1139         unsigned int u;
1140 #endif
1141 #ifndef OPENSSL_NO_DH
1142         DH *dh=NULL,*dhp;
1143 #endif
1144 #ifndef OPENSSL_NO_ECDH
1145         EC_KEY *ecdh=NULL, *ecdhp;
1146         unsigned char *encodedPoint = NULL;
1147         int encodedlen = 0;
1148         int curve_id = 0;
1149         BN_CTX *bn_ctx = NULL; 
1150 #endif
1151         EVP_PKEY *pkey;
1152         unsigned char *p,*d;
1153         int al,i;
1154         unsigned long type;
1155         int n;
1156         CERT *cert;
1157         BIGNUM *r[4];
1158         int nr[4],kn;
1159         BUF_MEM *buf;
1160         EVP_MD_CTX md_ctx;
1161
1162         EVP_MD_CTX_init(&md_ctx);
1163         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1164                 {
1165                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1166                 cert=s->cert;
1167
1168                 buf=s->init_buf;
1169
1170                 r[0]=r[1]=r[2]=r[3]=NULL;
1171                 n=0;
1172 #ifndef OPENSSL_NO_RSA
1173                 if (type & SSL_kRSA)
1174                         {
1175                         rsa=cert->rsa_tmp;
1176                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1177                                 {
1178                                 rsa=s->cert->rsa_tmp_cb(s,
1179                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1180                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1181                                 if(rsa == NULL)
1182                                 {
1183                                         al=SSL_AD_HANDSHAKE_FAILURE;
1184                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1185                                         goto f_err;
1186                                 }
1187                                 RSA_up_ref(rsa);
1188                                 cert->rsa_tmp=rsa;
1189                                 }
1190                         if (rsa == NULL)
1191                                 {
1192                                 al=SSL_AD_HANDSHAKE_FAILURE;
1193                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1194                                 goto f_err;
1195                                 }
1196                         r[0]=rsa->n;
1197                         r[1]=rsa->e;
1198                         s->s3->tmp.use_rsa_tmp=1;
1199                         }
1200                 else
1201 #endif
1202 #ifndef OPENSSL_NO_DH
1203                         if (type & SSL_kEDH)
1204                         {
1205                         dhp=cert->dh_tmp;
1206                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1207                                 dhp=s->cert->dh_tmp_cb(s,
1208                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1209                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1210                         if (dhp == NULL)
1211                                 {
1212                                 al=SSL_AD_HANDSHAKE_FAILURE;
1213                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1214                                 goto f_err;
1215                                 }
1216
1217                         if (s->s3->tmp.dh != NULL)
1218                                 {
1219                                 DH_free(dh);
1220                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1221                                 goto err;
1222                                 }
1223
1224                         if ((dh=DHparams_dup(dhp)) == NULL)
1225                                 {
1226                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1227                                 goto err;
1228                                 }
1229
1230                         s->s3->tmp.dh=dh;
1231                         if ((dhp->pub_key == NULL ||
1232                              dhp->priv_key == NULL ||
1233                              (s->options & SSL_OP_SINGLE_DH_USE)))
1234                                 {
1235                                 if(!DH_generate_key(dh))
1236                                     {
1237                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1238                                            ERR_R_DH_LIB);
1239                                     goto err;
1240                                     }
1241                                 }
1242                         else
1243                                 {
1244                                 dh->pub_key=BN_dup(dhp->pub_key);
1245                                 dh->priv_key=BN_dup(dhp->priv_key);
1246                                 if ((dh->pub_key == NULL) ||
1247                                         (dh->priv_key == NULL))
1248                                         {
1249                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1250                                         goto err;
1251                                         }
1252                                 }
1253                         r[0]=dh->p;
1254                         r[1]=dh->g;
1255                         r[2]=dh->pub_key;
1256                         }
1257                 else 
1258 #endif
1259 #ifndef OPENSSL_NO_ECDH
1260                         if (type & SSL_kECDHE)
1261                         {
1262                         const EC_GROUP *group;
1263
1264                         ecdhp=cert->ecdh_tmp;
1265                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1266                                 {
1267                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1268                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1269                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1270                                 }
1271                         if (ecdhp == NULL)
1272                                 {
1273                                 al=SSL_AD_HANDSHAKE_FAILURE;
1274                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1275                                 goto f_err;
1276                                 }
1277
1278                         if (s->s3->tmp.ecdh != NULL)
1279                                 {
1280                                 EC_KEY_free(s->s3->tmp.ecdh); 
1281                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1282                                 goto err;
1283                                 }
1284
1285                         /* Duplicate the ECDH structure. */
1286                         if (ecdhp == NULL)
1287                                 {
1288                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1289                                 goto err;
1290                                 }
1291                         if (!EC_KEY_up_ref(ecdhp))
1292                                 {
1293                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1294                                 goto err;
1295                                 }
1296                         ecdh = ecdhp;
1297
1298                         s->s3->tmp.ecdh=ecdh;
1299                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1300                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1301                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1302                                 {
1303                                 if(!EC_KEY_generate_key(ecdh))
1304                                     {
1305                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1306                                     goto err;
1307                                     }
1308                                 }
1309
1310                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1311                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1312                             (EC_KEY_get0_private_key(ecdh) == NULL))
1313                                 {
1314                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1315                                 goto err;
1316                                 }
1317
1318                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1319                             (EC_GROUP_get_degree(group) > 163)) 
1320                                 {
1321                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1322                                 goto err;
1323                                 }
1324
1325                         /* XXX: For now, we only support ephemeral ECDH
1326                          * keys over named (not generic) curves. For 
1327                          * supported named curves, curve_id is non-zero.
1328                          */
1329                         if ((curve_id = 
1330                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1331                             == 0)
1332                                 {
1333                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1334                                 goto err;
1335                                 }
1336
1337                         /* Encode the public key.
1338                          * First check the size of encoding and
1339                          * allocate memory accordingly.
1340                          */
1341                         encodedlen = EC_POINT_point2oct(group, 
1342                             EC_KEY_get0_public_key(ecdh),
1343                             POINT_CONVERSION_UNCOMPRESSED, 
1344                             NULL, 0, NULL);
1345
1346                         encodedPoint = (unsigned char *) 
1347                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1348                         bn_ctx = BN_CTX_new();
1349                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1350                                 {
1351                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1352                                 goto err;
1353                                 }
1354
1355
1356                         encodedlen = EC_POINT_point2oct(group, 
1357                             EC_KEY_get0_public_key(ecdh), 
1358                             POINT_CONVERSION_UNCOMPRESSED, 
1359                             encodedPoint, encodedlen, bn_ctx);
1360
1361                         if (encodedlen == 0) 
1362                                 {
1363                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1364                                 goto err;
1365                                 }
1366
1367                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1368
1369                         /* XXX: For now, we only support named (not 
1370                          * generic) curves in ECDH ephemeral key exchanges.
1371                          * In this situation, we need four additional bytes
1372                          * to encode the entire ServerECDHParams
1373                          * structure. 
1374                          */
1375                         n = 4 + encodedlen;
1376
1377                         /* We'll generate the serverKeyExchange message
1378                          * explicitly so we can set these to NULLs
1379                          */
1380                         r[0]=NULL;
1381                         r[1]=NULL;
1382                         r[2]=NULL;
1383                         r[3]=NULL;
1384                         }
1385                 else 
1386 #endif /* !OPENSSL_NO_ECDH */
1387                         {
1388                         al=SSL_AD_HANDSHAKE_FAILURE;
1389                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1390                         goto f_err;
1391                         }
1392                 for (i=0; r[i] != NULL; i++)
1393                         {
1394                         nr[i]=BN_num_bytes(r[i]);
1395                         n+=2+nr[i];
1396                         }
1397
1398                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1399                         {
1400                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1401                                 == NULL)
1402                                 {
1403                                 al=SSL_AD_DECODE_ERROR;
1404                                 goto f_err;
1405                                 }
1406                         kn=EVP_PKEY_size(pkey);
1407                         }
1408                 else
1409                         {
1410                         pkey=NULL;
1411                         kn=0;
1412                         }
1413
1414                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1415                         {
1416                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1417                         goto err;
1418                         }
1419                 d=(unsigned char *)s->init_buf->data;
1420                 p= &(d[4]);
1421
1422                 for (i=0; r[i] != NULL; i++)
1423                         {
1424                         s2n(nr[i],p);
1425                         BN_bn2bin(r[i],p);
1426                         p+=nr[i];
1427                         }
1428
1429 #ifndef OPENSSL_NO_ECDH
1430                 if (type & SSL_kECDHE) 
1431                         {
1432                         /* XXX: For now, we only support named (not generic) curves.
1433                          * In this situation, the serverKeyExchange message has:
1434                          * [1 byte CurveType], [2 byte CurveName]
1435                          * [1 byte length of encoded point], followed by
1436                          * the actual encoded point itself
1437                          */
1438                         *p = NAMED_CURVE_TYPE;
1439                         p += 1;
1440                         *p = 0;
1441                         p += 1;
1442                         *p = curve_id;
1443                         p += 1;
1444                         *p = encodedlen;
1445                         p += 1;
1446                         memcpy((unsigned char*)p, 
1447                             (unsigned char *)encodedPoint, 
1448                             encodedlen);
1449                         OPENSSL_free(encodedPoint);
1450                         p += encodedlen;
1451                         }
1452 #endif
1453
1454                 /* not anonymous */
1455                 if (pkey != NULL)
1456                         {
1457                         /* n is the length of the params, they start at &(d[4])
1458                          * and p points to the space at the end. */
1459 #ifndef OPENSSL_NO_RSA
1460                         if (pkey->type == EVP_PKEY_RSA)
1461                                 {
1462                                 q=md_buf;
1463                                 j=0;
1464                                 for (num=2; num > 0; num--)
1465                                         {
1466                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1467                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1468                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1469                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1470                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1471                                         EVP_DigestFinal_ex(&md_ctx,q,
1472                                                 (unsigned int *)&i);
1473                                         q+=i;
1474                                         j+=i;
1475                                         }
1476                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1477                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1478                                         {
1479                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1480                                         goto err;
1481                                         }
1482                                 s2n(u,p);
1483                                 n+=u+2;
1484                                 }
1485                         else
1486 #endif
1487 #if !defined(OPENSSL_NO_DSA)
1488                                 if (pkey->type == EVP_PKEY_DSA)
1489                                 {
1490                                 /* lets do DSS */
1491                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1492                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1493                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1494                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1495                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1496                                         (unsigned int *)&i,pkey))
1497                                         {
1498                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1499                                         goto err;
1500                                         }
1501                                 s2n(i,p);
1502                                 n+=i+2;
1503                                 }
1504                         else
1505 #endif
1506 #if !defined(OPENSSL_NO_ECDSA)
1507                                 if (pkey->type == EVP_PKEY_EC)
1508                                 {
1509                                 /* let's do ECDSA */
1510                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1511                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1512                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1513                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1514                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1515                                         (unsigned int *)&i,pkey))
1516                                         {
1517                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1518                                         goto err;
1519                                         }
1520                                 s2n(i,p);
1521                                 n+=i+2;
1522                                 }
1523                         else
1524 #endif
1525                                 {
1526                                 /* Is this error check actually needed? */
1527                                 al=SSL_AD_HANDSHAKE_FAILURE;
1528                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1529                                 goto f_err;
1530                                 }
1531                         }
1532
1533                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1534                 l2n3(n,d);
1535
1536                 /* we should now have things packed up, so lets send
1537                  * it off */
1538                 s->init_num=n+4;
1539                 s->init_off=0;
1540                 }
1541
1542         s->state = SSL3_ST_SW_KEY_EXCH_B;
1543         EVP_MD_CTX_cleanup(&md_ctx);
1544         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1545 f_err:
1546         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1547 err:
1548 #ifndef OPENSSL_NO_ECDH
1549         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1550         BN_CTX_free(bn_ctx);
1551 #endif
1552         EVP_MD_CTX_cleanup(&md_ctx);
1553         return(-1);
1554         }
1555
1556 int ssl3_send_certificate_request(SSL *s)
1557         {
1558         unsigned char *p,*d;
1559         int i,j,nl,off,n;
1560         STACK_OF(X509_NAME) *sk=NULL;
1561         X509_NAME *name;
1562         BUF_MEM *buf;
1563
1564         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1565                 {
1566                 buf=s->init_buf;
1567
1568                 d=p=(unsigned char *)&(buf->data[4]);
1569
1570                 /* get the list of acceptable cert types */
1571                 p++;
1572                 n=ssl3_get_req_cert_type(s,p);
1573                 d[0]=n;
1574                 p+=n;
1575                 n++;
1576
1577                 off=n;
1578                 p+=2;
1579                 n+=2;
1580
1581                 sk=SSL_get_client_CA_list(s);
1582                 nl=0;
1583                 if (sk != NULL)
1584                         {
1585                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1586                                 {
1587                                 name=sk_X509_NAME_value(sk,i);
1588                                 j=i2d_X509_NAME(name,NULL);
1589                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1590                                         {
1591                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1592                                         goto err;
1593                                         }
1594                                 p=(unsigned char *)&(buf->data[4+n]);
1595                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1596                                         {
1597                                         s2n(j,p);
1598                                         i2d_X509_NAME(name,&p);
1599                                         n+=2+j;
1600                                         nl+=2+j;
1601                                         }
1602                                 else
1603                                         {
1604                                         d=p;
1605                                         i2d_X509_NAME(name,&p);
1606                                         j-=2; s2n(j,d); j+=2;
1607                                         n+=j;
1608                                         nl+=j;
1609                                         }
1610                                 }
1611                         }
1612                 /* else no CA names */
1613                 p=(unsigned char *)&(buf->data[4+off]);
1614                 s2n(nl,p);
1615
1616                 d=(unsigned char *)buf->data;
1617                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1618                 l2n3(n,d);
1619
1620                 /* we should now have things packed up, so lets send
1621                  * it off */
1622
1623                 s->init_num=n+4;
1624                 s->init_off=0;
1625 #ifdef NETSCAPE_HANG_BUG
1626                 p=(unsigned char *)s->init_buf->data + s->init_num;
1627
1628                 /* do the header */
1629                 *(p++)=SSL3_MT_SERVER_DONE;
1630                 *(p++)=0;
1631                 *(p++)=0;
1632                 *(p++)=0;
1633                 s->init_num += 4;
1634 #endif
1635
1636                 s->state = SSL3_ST_SW_CERT_REQ_B;
1637                 }
1638
1639         /* SSL3_ST_SW_CERT_REQ_B */
1640         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1641 err:
1642         return(-1);
1643         }
1644
1645 int ssl3_get_client_key_exchange(SSL *s)
1646         {
1647         int i,al,ok;
1648         long n;
1649         unsigned long l;
1650         unsigned char *p;
1651 #ifndef OPENSSL_NO_RSA
1652         RSA *rsa=NULL;
1653         EVP_PKEY *pkey=NULL;
1654 #endif
1655 #ifndef OPENSSL_NO_DH
1656         BIGNUM *pub=NULL;
1657         DH *dh_srvr;
1658 #endif
1659 #ifndef OPENSSL_NO_KRB5
1660         KSSL_ERR kssl_err;
1661 #endif /* OPENSSL_NO_KRB5 */
1662
1663 #ifndef OPENSSL_NO_ECDH
1664         EC_KEY *srvr_ecdh = NULL;
1665         EVP_PKEY *clnt_pub_pkey = NULL;
1666         EC_POINT *clnt_ecpoint = NULL;
1667         BN_CTX *bn_ctx = NULL; 
1668 #endif
1669
1670         n=s->method->ssl_get_message(s,
1671                 SSL3_ST_SR_KEY_EXCH_A,
1672                 SSL3_ST_SR_KEY_EXCH_B,
1673                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1674                 2048, /* ??? */
1675                 &ok);
1676
1677         if (!ok) return((int)n);
1678         p=(unsigned char *)s->init_msg;
1679
1680         l=s->s3->tmp.new_cipher->algorithms;
1681
1682 #ifndef OPENSSL_NO_RSA
1683         if (l & SSL_kRSA)
1684                 {
1685                 /* FIX THIS UP EAY EAY EAY EAY */
1686                 if (s->s3->tmp.use_rsa_tmp)
1687                         {
1688                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1689                                 rsa=s->cert->rsa_tmp;
1690                         /* Don't do a callback because rsa_tmp should
1691                          * be sent already */
1692                         if (rsa == NULL)
1693                                 {
1694                                 al=SSL_AD_HANDSHAKE_FAILURE;
1695                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1696                                 goto f_err;
1697
1698                                 }
1699                         }
1700                 else
1701                         {
1702                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1703                         if (    (pkey == NULL) ||
1704                                 (pkey->type != EVP_PKEY_RSA) ||
1705                                 (pkey->pkey.rsa == NULL))
1706                                 {
1707                                 al=SSL_AD_HANDSHAKE_FAILURE;
1708                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1709                                 goto f_err;
1710                                 }
1711                         rsa=pkey->pkey.rsa;
1712                         }
1713
1714                 /* TLS */
1715                 if (s->version > SSL3_VERSION)
1716                         {
1717                         n2s(p,i);
1718                         if (n != i+2)
1719                                 {
1720                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1721                                         {
1722                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1723                                         goto err;
1724                                         }
1725                                 else
1726                                         p-=2;
1727                                 }
1728                         else
1729                                 n=i;
1730                         }
1731
1732                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1733
1734                 al = -1;
1735                 
1736                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1737                         {
1738                         al=SSL_AD_DECODE_ERROR;
1739                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1740                         }
1741
1742                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1743                         {
1744                         /* The premaster secret must contain the same version number as the
1745                          * ClientHello to detect version rollback attacks (strangely, the
1746                          * protocol does not offer such protection for DH ciphersuites).
1747                          * However, buggy clients exist that send the negotiated protocol
1748                          * version instead if the server does not support the requested
1749                          * protocol version.
1750                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1751                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1752                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1753                                 {
1754                                 al=SSL_AD_DECODE_ERROR;
1755                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1756
1757                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1758                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1759                                  * number check as a "bad version oracle" -- an alert would
1760                                  * reveal that the plaintext corresponding to some ciphertext
1761                                  * made up by the adversary is properly formatted except
1762                                  * that the version number is wrong.  To avoid such attacks,
1763                                  * we should treat this just like any other decryption error. */
1764                                 }
1765                         }
1766
1767                 if (al != -1)
1768                         {
1769                         /* Some decryption failure -- use random value instead as countermeasure
1770                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1771                          * (see RFC 2246, section 7.4.7.1). */
1772                         ERR_clear_error();
1773                         i = SSL_MAX_MASTER_KEY_LENGTH;
1774                         p[0] = s->client_version >> 8;
1775                         p[1] = s->client_version & 0xff;
1776                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1777                                 goto err;
1778                         }
1779         
1780                 s->session->master_key_length=
1781                         s->method->ssl3_enc->generate_master_secret(s,
1782                                 s->session->master_key,
1783                                 p,i);
1784                 OPENSSL_cleanse(p,i);
1785                 }
1786         else
1787 #endif
1788 #ifndef OPENSSL_NO_DH
1789                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1790                 {
1791                 n2s(p,i);
1792                 if (n != i+2)
1793                         {
1794                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1795                                 {
1796                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1797                                 goto err;
1798                                 }
1799                         else
1800                                 {
1801                                 p-=2;
1802                                 i=(int)n;
1803                                 }
1804                         }
1805
1806                 if (n == 0L) /* the parameters are in the cert */
1807                         {
1808                         al=SSL_AD_HANDSHAKE_FAILURE;
1809                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1810                         goto f_err;
1811                         }
1812                 else
1813                         {
1814                         if (s->s3->tmp.dh == NULL)
1815                                 {
1816                                 al=SSL_AD_HANDSHAKE_FAILURE;
1817                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1818                                 goto f_err;
1819                                 }
1820                         else
1821                                 dh_srvr=s->s3->tmp.dh;
1822                         }
1823
1824                 pub=BN_bin2bn(p,i,NULL);
1825                 if (pub == NULL)
1826                         {
1827                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1828                         goto err;
1829                         }
1830
1831                 i=DH_compute_key(p,pub,dh_srvr);
1832
1833                 if (i <= 0)
1834                         {
1835                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1836                         goto err;
1837                         }
1838
1839                 DH_free(s->s3->tmp.dh);
1840                 s->s3->tmp.dh=NULL;
1841
1842                 BN_clear_free(pub);
1843                 pub=NULL;
1844                 s->session->master_key_length=
1845                         s->method->ssl3_enc->generate_master_secret(s,
1846                                 s->session->master_key,p,i);
1847                 OPENSSL_cleanse(p,i);
1848                 }
1849         else
1850 #endif
1851 #ifndef OPENSSL_NO_KRB5
1852         if (l & SSL_kKRB5)
1853                 {
1854                 krb5_error_code         krb5rc;
1855                 krb5_data               enc_ticket;
1856                 krb5_data               authenticator;
1857                 krb5_data               enc_pms;
1858                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1859                 EVP_CIPHER_CTX          ciph_ctx;
1860                 EVP_CIPHER              *enc = NULL;
1861                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1862                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1863                                                + EVP_MAX_BLOCK_LENGTH];
1864                 int                     padl, outl;
1865                 krb5_timestamp          authtime = 0;
1866                 krb5_ticket_times       ttimes;
1867
1868                 EVP_CIPHER_CTX_init(&ciph_ctx);
1869
1870                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1871
1872                 n2s(p,i);
1873                 enc_ticket.length = i;
1874
1875                 if (n < (int)enc_ticket.length + 6)
1876                         {
1877                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1878                                 SSL_R_DATA_LENGTH_TOO_LONG);
1879                         goto err;
1880                         }
1881
1882                 enc_ticket.data = (char *)p;
1883                 p+=enc_ticket.length;
1884
1885                 n2s(p,i);
1886                 authenticator.length = i;
1887
1888                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
1889                         {
1890                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1891                                 SSL_R_DATA_LENGTH_TOO_LONG);
1892                         goto err;
1893                         }
1894
1895                 authenticator.data = (char *)p;
1896                 p+=authenticator.length;
1897
1898                 n2s(p,i);
1899                 enc_pms.length = i;
1900                 enc_pms.data = (char *)p;
1901                 p+=enc_pms.length;
1902
1903                 /* Note that the length is checked again below,
1904                 ** after decryption
1905                 */
1906                 if(enc_pms.length > sizeof pms)
1907                         {
1908                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1909                                SSL_R_DATA_LENGTH_TOO_LONG);
1910                         goto err;
1911                         }
1912
1913                 if (n != (long)(enc_ticket.length + authenticator.length +
1914                                                 enc_pms.length + 6))
1915                         {
1916                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1917                                 SSL_R_DATA_LENGTH_TOO_LONG);
1918                         goto err;
1919                         }
1920
1921                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1922                                         &kssl_err)) != 0)
1923                         {
1924 #ifdef KSSL_DEBUG
1925                         printf("kssl_sget_tkt rtn %d [%d]\n",
1926                                 krb5rc, kssl_err.reason);
1927                         if (kssl_err.text)
1928                                 printf("kssl_err text= %s\n", kssl_err.text);
1929 #endif  /* KSSL_DEBUG */
1930                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1931                                 kssl_err.reason);
1932                         goto err;
1933                         }
1934
1935                 /*  Note: no authenticator is not considered an error,
1936                 **  but will return authtime == 0.
1937                 */
1938                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1939                                         &authtime, &kssl_err)) != 0)
1940                         {
1941 #ifdef KSSL_DEBUG
1942                         printf("kssl_check_authent rtn %d [%d]\n",
1943                                 krb5rc, kssl_err.reason);
1944                         if (kssl_err.text)
1945                                 printf("kssl_err text= %s\n", kssl_err.text);
1946 #endif  /* KSSL_DEBUG */
1947                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1948                                 kssl_err.reason);
1949                         goto err;
1950                         }
1951
1952                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1953                         {
1954                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
1955                         goto err;
1956                         }
1957
1958 #ifdef KSSL_DEBUG
1959                 kssl_ctx_show(kssl_ctx);
1960 #endif  /* KSSL_DEBUG */
1961
1962                 enc = kssl_map_enc(kssl_ctx->enctype);
1963                 if (enc == NULL)
1964                     goto err;
1965
1966                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
1967
1968                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1969                         {
1970                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1971                                 SSL_R_DECRYPTION_FAILED);
1972                         goto err;
1973                         }
1974                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1975                                         (unsigned char *)enc_pms.data, enc_pms.length))
1976                         {
1977                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1978                                 SSL_R_DECRYPTION_FAILED);
1979                         goto err;
1980                         }
1981                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1982                         {
1983                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1984                                 SSL_R_DATA_LENGTH_TOO_LONG);
1985                         goto err;
1986                         }
1987                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1988                         {
1989                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1990                                 SSL_R_DECRYPTION_FAILED);
1991                         goto err;
1992                         }
1993                 outl += padl;
1994                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1995                         {
1996                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1997                                 SSL_R_DATA_LENGTH_TOO_LONG);
1998                         goto err;
1999                         }
2000                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2001                     {
2002                     /* The premaster secret must contain the same version number as the
2003                      * ClientHello to detect version rollback attacks (strangely, the
2004                      * protocol does not offer such protection for DH ciphersuites).
2005                      * However, buggy clients exist that send random bytes instead of
2006                      * the protocol version.
2007                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. 
2008                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2009                      */
2010                     if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2011                            (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2012                         {
2013                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2014                                SSL_AD_DECODE_ERROR);
2015                         goto err;
2016                         }
2017                     }
2018
2019                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2020
2021                 s->session->master_key_length=
2022                         s->method->ssl3_enc->generate_master_secret(s,
2023                                 s->session->master_key, pms, outl);
2024
2025                 if (kssl_ctx->client_princ)
2026                         {
2027                         size_t len = strlen(kssl_ctx->client_princ);
2028                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2029                                 {
2030                                 s->session->krb5_client_princ_len = len;
2031                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2032                                 }
2033                         }
2034
2035
2036                 /*  Was doing kssl_ctx_free() here,
2037                 **  but it caused problems for apache.
2038                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2039                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2040                 */
2041                 }
2042         else
2043 #endif  /* OPENSSL_NO_KRB5 */
2044
2045 #ifndef OPENSSL_NO_ECDH
2046                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2047                 {
2048                 int ret = 1;
2049                 int field_size = 0;
2050                 const EC_KEY   *tkey;
2051                 const EC_GROUP *group;
2052                 const BIGNUM *priv_key;
2053
2054                 /* initialize structures for server's ECDH key pair */
2055                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2056                         {
2057                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2058                             ERR_R_MALLOC_FAILURE);
2059                         goto err;
2060                         }
2061
2062                 /* Let's get server private key and group information */
2063                 if (l & SSL_kECDH) 
2064                         { 
2065                         /* use the certificate */
2066                         tkey = s->cert->key->privatekey->pkey.ec;
2067                         }
2068                 else
2069                         {
2070                         /* use the ephermeral values we saved when
2071                          * generating the ServerKeyExchange msg.
2072                          */
2073                         tkey = s->s3->tmp.ecdh;
2074                         }
2075
2076                 group    = EC_KEY_get0_group(tkey);
2077                 priv_key = EC_KEY_get0_private_key(tkey);
2078
2079                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2080                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2081                         {
2082                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2083                                ERR_R_EC_LIB);
2084                         goto err;
2085                         }
2086
2087                 /* Let's get client's public key */
2088                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2089                         {
2090                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2091                             ERR_R_MALLOC_FAILURE);
2092                         goto err;
2093                         }
2094
2095                 if (n == 0L) 
2096                         {
2097                         /* Client Publickey was in Client Certificate */
2098
2099                          if (l & SSL_kECDHE) 
2100                                  {
2101                                  al=SSL_AD_HANDSHAKE_FAILURE;
2102                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2103                                  goto f_err;
2104                                  }
2105                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2106                             == NULL) || 
2107                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2108                                 {
2109                                 /* XXX: For now, we do not support client
2110                                  * authentication using ECDH certificates
2111                                  * so this branch (n == 0L) of the code is
2112                                  * never executed. When that support is
2113                                  * added, we ought to ensure the key 
2114                                  * received in the certificate is 
2115                                  * authorized for key agreement.
2116                                  * ECDH_compute_key implicitly checks that
2117                                  * the two ECDH shares are for the same
2118                                  * group.
2119                                  */
2120                                 al=SSL_AD_HANDSHAKE_FAILURE;
2121                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2122                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2123                                 goto f_err;
2124                                 }
2125
2126                         if (EC_POINT_copy(clnt_ecpoint,
2127                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2128                                 {
2129                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2130                                         ERR_R_EC_LIB);
2131                                 goto err;
2132                                 }
2133                         ret = 2; /* Skip certificate verify processing */
2134                         }
2135                 else
2136                         {
2137                         /* Get client's public key from encoded point
2138                          * in the ClientKeyExchange message.
2139                          */
2140                         if ((bn_ctx = BN_CTX_new()) == NULL)
2141                                 {
2142                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2143                                     ERR_R_MALLOC_FAILURE);
2144                                 goto err;
2145                                 }
2146
2147                         /* Get encoded point length */
2148                         i = *p; 
2149                         p += 1;
2150                         if (EC_POINT_oct2point(group, 
2151                             clnt_ecpoint, p, i, bn_ctx) == 0)
2152                                 {
2153                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2154                                     ERR_R_EC_LIB);
2155                                 goto err;
2156                                 }
2157                         /* p is pointing to somewhere in the buffer
2158                          * currently, so set it to the start 
2159                          */ 
2160                         p=(unsigned char *)s->init_buf->data;
2161                         }
2162
2163                 /* Compute the shared pre-master secret */
2164                 field_size = EC_GROUP_get_degree(group);
2165                 if (field_size <= 0)
2166                         {
2167                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2168                                ERR_R_ECDH_LIB);
2169                         goto err;
2170                         }
2171                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2172                 if (i <= 0)
2173                         {
2174                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2175                             ERR_R_ECDH_LIB);
2176                         goto err;
2177                         }
2178
2179                 EVP_PKEY_free(clnt_pub_pkey);
2180                 EC_POINT_free(clnt_ecpoint);
2181                 if (srvr_ecdh != NULL) 
2182                         EC_KEY_free(srvr_ecdh);
2183                 BN_CTX_free(bn_ctx);
2184
2185                 /* Compute the master secret */
2186                 s->session->master_key_length = s->method->ssl3_enc-> \
2187                     generate_master_secret(s, s->session->master_key, p, i);
2188                 
2189                 OPENSSL_cleanse(p, i);
2190                 return (ret);
2191                 }
2192         else
2193 #endif
2194                 {
2195                 al=SSL_AD_HANDSHAKE_FAILURE;
2196                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2197                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2198                 goto f_err;
2199                 }
2200
2201         return(1);
2202 f_err:
2203         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2204 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2205 err:
2206 #endif
2207 #ifndef OPENSSL_NO_ECDH
2208         EVP_PKEY_free(clnt_pub_pkey);
2209         EC_POINT_free(clnt_ecpoint);
2210         if (srvr_ecdh != NULL) 
2211                 EC_KEY_free(srvr_ecdh);
2212         BN_CTX_free(bn_ctx);
2213 #endif
2214         return(-1);
2215         }
2216
2217 int ssl3_get_cert_verify(SSL *s)
2218         {
2219         EVP_PKEY *pkey=NULL;
2220         unsigned char *p;
2221         int al,ok,ret=0;
2222         long n;
2223         int type=0,i,j;
2224         X509 *peer;
2225
2226         n=s->method->ssl_get_message(s,
2227                 SSL3_ST_SR_CERT_VRFY_A,
2228                 SSL3_ST_SR_CERT_VRFY_B,
2229                 -1,
2230                 514, /* 514? */
2231                 &ok);
2232
2233         if (!ok) return((int)n);
2234
2235         if (s->session->peer != NULL)
2236                 {
2237                 peer=s->session->peer;
2238                 pkey=X509_get_pubkey(peer);
2239                 type=X509_certificate_type(peer,pkey);
2240                 }
2241         else
2242                 {
2243                 peer=NULL;
2244                 pkey=NULL;
2245                 }
2246
2247         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2248                 {
2249                 s->s3->tmp.reuse_message=1;
2250                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2251                         {
2252                         al=SSL_AD_UNEXPECTED_MESSAGE;
2253                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2254                         goto f_err;
2255                         }
2256                 ret=1;
2257                 goto end;
2258                 }
2259
2260         if (peer == NULL)
2261                 {
2262                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2263                 al=SSL_AD_UNEXPECTED_MESSAGE;
2264                 goto f_err;
2265                 }
2266
2267         if (!(type & EVP_PKT_SIGN))
2268                 {
2269                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2270                 al=SSL_AD_ILLEGAL_PARAMETER;
2271                 goto f_err;
2272                 }
2273
2274         if (s->s3->change_cipher_spec)
2275                 {
2276                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2277                 al=SSL_AD_UNEXPECTED_MESSAGE;
2278                 goto f_err;
2279                 }
2280
2281         /* we now have a signature that we need to verify */
2282         p=(unsigned char *)s->init_msg;
2283         n2s(p,i);
2284         n-=2;
2285         if (i > n)
2286                 {
2287                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2288                 al=SSL_AD_DECODE_ERROR;
2289                 goto f_err;
2290                 }
2291
2292         j=EVP_PKEY_size(pkey);
2293         if ((i > j) || (n > j) || (n <= 0))
2294                 {
2295                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2296                 al=SSL_AD_DECODE_ERROR;
2297                 goto f_err;
2298                 }
2299
2300 #ifndef OPENSSL_NO_RSA 
2301         if (pkey->type == EVP_PKEY_RSA)
2302                 {
2303                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2304                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
2305                                                         pkey->pkey.rsa);
2306                 if (i < 0)
2307                         {
2308                         al=SSL_AD_DECRYPT_ERROR;
2309                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2310                         goto f_err;
2311                         }
2312                 if (i == 0)
2313                         {
2314                         al=SSL_AD_DECRYPT_ERROR;
2315                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2316                         goto f_err;
2317                         }
2318                 }
2319         else
2320 #endif
2321 #ifndef OPENSSL_NO_DSA
2322                 if (pkey->type == EVP_PKEY_DSA)
2323                 {
2324                 j=DSA_verify(pkey->save_type,
2325                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2326                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2327                 if (j <= 0)
2328                         {
2329                         /* bad signature */
2330                         al=SSL_AD_DECRYPT_ERROR;
2331                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2332                         goto f_err;
2333                         }
2334                 }
2335         else
2336 #endif
2337 #ifndef OPENSSL_NO_ECDSA
2338                 if (pkey->type == EVP_PKEY_EC)
2339                 {
2340                 j=ECDSA_verify(pkey->save_type,
2341                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2342                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2343                 if (j <= 0)
2344                         {
2345                         /* bad signature */
2346                         al=SSL_AD_DECRYPT_ERROR;
2347                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2348                             SSL_R_BAD_ECDSA_SIGNATURE);
2349                         goto f_err;
2350                         }
2351                 }
2352         else
2353 #endif
2354                 {
2355                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2356                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2357                 goto f_err;
2358                 }
2359
2360
2361         ret=1;
2362         if (0)
2363                 {
2364 f_err:
2365                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2366                 }
2367 end:
2368         EVP_PKEY_free(pkey);
2369         return(ret);
2370         }
2371
2372 int ssl3_get_client_certificate(SSL *s)
2373         {
2374         int i,ok,al,ret= -1;
2375         X509 *x=NULL;
2376         unsigned long l,nc,llen,n;
2377         const unsigned char *p,*q;
2378         unsigned char *d;
2379         STACK_OF(X509) *sk=NULL;
2380
2381         n=s->method->ssl_get_message(s,
2382                 SSL3_ST_SR_CERT_A,
2383                 SSL3_ST_SR_CERT_B,
2384                 -1,
2385                 s->max_cert_list,
2386                 &ok);
2387
2388         if (!ok) return((int)n);
2389
2390         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2391                 {
2392                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2393                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2394                         {
2395                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2396                         al=SSL_AD_HANDSHAKE_FAILURE;
2397                         goto f_err;
2398                         }
2399                 /* If tls asked for a client cert, the client must return a 0 list */
2400                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2401                         {
2402                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2403                         al=SSL_AD_UNEXPECTED_MESSAGE;
2404                         goto f_err;
2405                         }
2406                 s->s3->tmp.reuse_message=1;
2407                 return(1);
2408                 }
2409
2410         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2411                 {
2412                 al=SSL_AD_UNEXPECTED_MESSAGE;
2413                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2414                 goto f_err;
2415                 }
2416         p=d=(unsigned char *)s->init_msg;
2417
2418         if ((sk=sk_X509_new_null()) == NULL)
2419                 {
2420                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2421                 goto err;
2422                 }
2423
2424         n2l3(p,llen);
2425         if (llen+3 != n)
2426                 {
2427                 al=SSL_AD_DECODE_ERROR;
2428                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2429                 goto f_err;
2430                 }
2431         for (nc=0; nc<llen; )
2432                 {
2433                 n2l3(p,l);
2434                 if ((l+nc+3) > llen)
2435                         {
2436                         al=SSL_AD_DECODE_ERROR;
2437                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2438                         goto f_err;
2439                         }
2440
2441                 q=p;
2442                 x=d2i_X509(NULL,&p,l);
2443                 if (x == NULL)
2444                         {
2445                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2446                         goto err;
2447                         }
2448                 if (p != (q+l))
2449                         {
2450                         al=SSL_AD_DECODE_ERROR;
2451                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2452                         goto f_err;
2453                         }
2454                 if (!sk_X509_push(sk,x))
2455                         {
2456                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2457                         goto err;
2458                         }
2459                 x=NULL;
2460                 nc+=l+3;
2461                 }
2462
2463         if (sk_X509_num(sk) <= 0)
2464                 {
2465                 /* TLS does not mind 0 certs returned */
2466                 if (s->version == SSL3_VERSION)
2467                         {
2468                         al=SSL_AD_HANDSHAKE_FAILURE;
2469                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2470                         goto f_err;
2471                         }
2472                 /* Fail for TLS only if we required a certificate */
2473                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2474                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2475                         {
2476                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2477                         al=SSL_AD_HANDSHAKE_FAILURE;
2478                         goto f_err;
2479                         }
2480                 }
2481         else
2482                 {
2483                 i=ssl_verify_cert_chain(s,sk);
2484                 if (!i)
2485                         {
2486                         al=ssl_verify_alarm_type(s->verify_result);
2487                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2488                         goto f_err;
2489                         }
2490                 }
2491
2492         if (s->session->peer != NULL) /* This should not be needed */
2493                 X509_free(s->session->peer);
2494         s->session->peer=sk_X509_shift(sk);
2495         s->session->verify_result = s->verify_result;
2496
2497         /* With the current implementation, sess_cert will always be NULL
2498          * when we arrive here. */
2499         if (s->session->sess_cert == NULL)
2500                 {
2501                 s->session->sess_cert = ssl_sess_cert_new();
2502                 if (s->session->sess_cert == NULL)
2503                         {
2504                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2505                         goto err;
2506                         }
2507                 }
2508         if (s->session->sess_cert->cert_chain != NULL)
2509                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2510         s->session->sess_cert->cert_chain=sk;
2511         /* Inconsistency alert: cert_chain does *not* include the
2512          * peer's own certificate, while we do include it in s3_clnt.c */
2513
2514         sk=NULL;
2515
2516         ret=1;
2517         if (0)
2518                 {
2519 f_err:
2520                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2521                 }
2522 err:
2523         if (x != NULL) X509_free(x);
2524         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2525         return(ret);
2526         }
2527
2528 int ssl3_send_server_certificate(SSL *s)
2529         {
2530         unsigned long l;
2531         X509 *x;
2532
2533         if (s->state == SSL3_ST_SW_CERT_A)
2534                 {
2535                 x=ssl_get_server_send_cert(s);
2536                 if (x == NULL &&
2537                         /* VRS: allow null cert if auth == KRB5 */
2538                         (s->s3->tmp.new_cipher->algorithms
2539                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2540                         != (SSL_aKRB5|SSL_kKRB5))
2541                         {
2542                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2543                         return(0);
2544                         }
2545
2546                 l=ssl3_output_cert_chain(s,x);
2547                 s->state=SSL3_ST_SW_CERT_B;
2548                 s->init_num=(int)l;
2549                 s->init_off=0;
2550                 }
2551
2552         /* SSL3_ST_SW_CERT_B */
2553         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2554         }
2555
2556
2557 #ifndef OPENSSL_NO_ECDH
2558 /* This is the complement of curve_id2nid in s3_clnt.c. */
2559 static int nid2curve_id(int nid)
2560 {
2561         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2562          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2563         switch (nid) {
2564         case NID_sect163k1: /* sect163k1 (1) */
2565                 return 1;
2566         case NID_sect163r1: /* sect163r1 (2) */
2567                 return 2;
2568         case NID_sect163r2: /* sect163r2 (3) */
2569                 return 3;
2570         case NID_sect193r1: /* sect193r1 (4) */ 
2571                 return 4;
2572         case NID_sect193r2: /* sect193r2 (5) */ 
2573                 return 5;
2574         case NID_sect233k1: /* sect233k1 (6) */
2575                 return 6;
2576         case NID_sect233r1: /* sect233r1 (7) */ 
2577                 return 7;
2578         case NID_sect239k1: /* sect239k1 (8) */ 
2579                 return 8;
2580         case NID_sect283k1: /* sect283k1 (9) */
2581                 return 9;
2582         case NID_sect283r1: /* sect283r1 (10) */ 
2583                 return 10;
2584         case NID_sect409k1: /* sect409k1 (11) */ 
2585                 return 11;
2586         case NID_sect409r1: /* sect409r1 (12) */
2587                 return 12;
2588         case NID_sect571k1: /* sect571k1 (13) */ 
2589                 return 13;
2590         case NID_sect571r1: /* sect571r1 (14) */ 
2591                 return 14;
2592         case NID_secp160k1: /* secp160k1 (15) */
2593                 return 15;
2594         case NID_secp160r1: /* secp160r1 (16) */ 
2595                 return 16;
2596         case NID_secp160r2: /* secp160r2 (17) */ 
2597                 return 17;
2598         case NID_secp192k1: /* secp192k1 (18) */
2599                 return 18;
2600         case NID_X9_62_prime192v1: /* secp192r1 (19) */ 
2601                 return 19;
2602         case NID_secp224k1: /* secp224k1 (20) */ 
2603                 return 20;
2604         case NID_secp224r1: /* secp224r1 (21) */
2605                 return 21;
2606         case NID_secp256k1: /* secp256k1 (22) */ 
2607                 return 22;
2608         case NID_X9_62_prime256v1: /* secp256r1 (23) */ 
2609                 return 23;
2610         case NID_secp384r1: /* secp384r1 (24) */
2611                 return 24;
2612         case NID_secp521r1:  /* secp521r1 (25) */       
2613                 return 25;
2614         default:
2615                 return 0;
2616         }
2617 }
2618 #endif