Initialize SSL_METHOD structures at compile time. This removes the need
[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=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 */
304                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
305                                 {
306                                 ret=ssl3_send_server_certificate(s);
307                                 if (ret <= 0) goto end;
308                                 }
309                         else
310                                 skip=1;
311                         s->state=SSL3_ST_SW_KEY_EXCH_A;
312                         s->init_num=0;
313                         break;
314
315                 case SSL3_ST_SW_KEY_EXCH_A:
316                 case SSL3_ST_SW_KEY_EXCH_B:
317                         l=s->s3->tmp.new_cipher->algorithms;
318
319                         /* clear this, it may get reset by
320                          * send_server_key_exchange */
321                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
322 #ifndef OPENSSL_NO_KRB5
323                                 && !(l & SSL_KRB5)
324 #endif /* OPENSSL_NO_KRB5 */
325                                 )
326                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
327                                  * even when forbidden by protocol specs
328                                  * (handshake may fail as clients are not required to
329                                  * be able to handle this) */
330                                 s->s3->tmp.use_rsa_tmp=1;
331                         else
332                                 s->s3->tmp.use_rsa_tmp=0;
333
334
335                         /* only send if a DH key exchange, fortezza or
336                          * RSA but we have a sign only certificate
337                          *
338                          * For ECC ciphersuites, we send a serverKeyExchange
339                          * message only if the cipher suite is either
340                          * ECDH-anon or ECDHE. In other cases, the
341                          * server certificate contains the server's 
342                          * public key for key exchange.
343                          */
344                         if (s->s3->tmp.use_rsa_tmp
345                             || (l & SSL_kECDHE)
346                             || (l & (SSL_DH|SSL_kFZA))
347                             || ((l & SSL_kRSA)
348                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
349                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
350                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
351                                         )
352                                     )
353                                 )
354                             )
355                                 {
356                                 ret=ssl3_send_server_key_exchange(s);
357                                 if (ret <= 0) goto end;
358                                 }
359                         else
360                                 skip=1;
361
362                         s->state=SSL3_ST_SW_CERT_REQ_A;
363                         s->init_num=0;
364                         break;
365
366                 case SSL3_ST_SW_CERT_REQ_A:
367                 case SSL3_ST_SW_CERT_REQ_B:
368                         if (/* don't request cert unless asked for it: */
369                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
370                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
371                                  * don't request cert during re-negotiation: */
372                                 ((s->session->peer != NULL) &&
373                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
374                                 /* never request cert in anonymous ciphersuites
375                                  * (see section "Certificate request" in SSL 3 drafts
376                                  * and in RFC 2246): */
377                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
378                                  /* ... except when the application insists on verification
379                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
380                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
381                                  /* never request cert in Kerberos ciphersuites */
382                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
383                                 {
384                                 /* no cert request */
385                                 skip=1;
386                                 s->s3->tmp.cert_request=0;
387                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
388                                 }
389                         else
390                                 {
391                                 s->s3->tmp.cert_request=1;
392                                 ret=ssl3_send_certificate_request(s);
393                                 if (ret <= 0) goto end;
394 #ifndef NETSCAPE_HANG_BUG
395                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
396 #else
397                                 s->state=SSL3_ST_SW_FLUSH;
398                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
399 #endif
400                                 s->init_num=0;
401                                 }
402                         break;
403
404                 case SSL3_ST_SW_SRVR_DONE_A:
405                 case SSL3_ST_SW_SRVR_DONE_B:
406                         ret=ssl3_send_server_done(s);
407                         if (ret <= 0) goto end;
408                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
409                         s->state=SSL3_ST_SW_FLUSH;
410                         s->init_num=0;
411                         break;
412                 
413                 case SSL3_ST_SW_FLUSH:
414                         /* number of bytes to be flushed */
415                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
416                         if (num1 > 0)
417                                 {
418                                 s->rwstate=SSL_WRITING;
419                                 num1=BIO_flush(s->wbio);
420                                 if (num1 <= 0) { ret= -1; goto end; }
421                                 s->rwstate=SSL_NOTHING;
422                                 }
423
424                         s->state=s->s3->tmp.next_state;
425                         break;
426
427                 case SSL3_ST_SR_CERT_A:
428                 case SSL3_ST_SR_CERT_B:
429                         /* Check for second client hello (MS SGC) */
430                         ret = ssl3_check_client_hello(s);
431                         if (ret <= 0)
432                                 goto end;
433                         if (ret == 2)
434                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
435                         else {
436                                 if (s->s3->tmp.cert_request)
437                                         {
438                                         ret=ssl3_get_client_certificate(s);
439                                         if (ret <= 0) goto end;
440                                         }
441                                 s->init_num=0;
442                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
443                         }
444                         break;
445
446                 case SSL3_ST_SR_KEY_EXCH_A:
447                 case SSL3_ST_SR_KEY_EXCH_B:
448                         ret=ssl3_get_client_key_exchange(s);
449                         if (ret <= 0) 
450                                 goto end;
451                         if (ret == 2)
452                                 {
453                                 /* For the ECDH ciphersuites when
454                                  * the client sends its ECDH pub key in
455                                  * a certificate, the CertificateVerify
456                                  * message is not sent.
457                                  */
458                                 s->state=SSL3_ST_SR_FINISHED_A;
459                                 s->init_num = 0;
460                                 }
461                         else   
462                                 {
463                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
464                                 s->init_num=0;
465
466                                 /* We need to get hashes here so if there is
467                                  * a client cert, it can be verified
468                                  */ 
469                                 s->method->ssl3_enc->cert_verify_mac(s,
470                                     &(s->s3->finish_dgst1),
471                                     &(s->s3->tmp.cert_verify_md[0]));
472                                 s->method->ssl3_enc->cert_verify_mac(s,
473                                     &(s->s3->finish_dgst2),
474                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
475                                 }
476                         break;
477
478                 case SSL3_ST_SR_CERT_VRFY_A:
479                 case SSL3_ST_SR_CERT_VRFY_B:
480
481                         /* we should decide if we expected this one */
482                         ret=ssl3_get_cert_verify(s);
483                         if (ret <= 0) goto end;
484
485                         s->state=SSL3_ST_SR_FINISHED_A;
486                         s->init_num=0;
487                         break;
488
489                 case SSL3_ST_SR_FINISHED_A:
490                 case SSL3_ST_SR_FINISHED_B:
491                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
492                                 SSL3_ST_SR_FINISHED_B);
493                         if (ret <= 0) goto end;
494                         if (s->hit)
495                                 s->state=SSL_ST_OK;
496                         else
497                                 s->state=SSL3_ST_SW_CHANGE_A;
498                         s->init_num=0;
499                         break;
500
501                 case SSL3_ST_SW_CHANGE_A:
502                 case SSL3_ST_SW_CHANGE_B:
503
504                         s->session->cipher=s->s3->tmp.new_cipher;
505                         if (!s->method->ssl3_enc->setup_key_block(s))
506                                 { ret= -1; goto end; }
507
508                         ret=ssl3_send_change_cipher_spec(s,
509                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
510
511                         if (ret <= 0) goto end;
512                         s->state=SSL3_ST_SW_FINISHED_A;
513                         s->init_num=0;
514
515                         if (!s->method->ssl3_enc->change_cipher_state(s,
516                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
517                                 {
518                                 ret= -1;
519                                 goto end;
520                                 }
521
522                         break;
523
524                 case SSL3_ST_SW_FINISHED_A:
525                 case SSL3_ST_SW_FINISHED_B:
526                         ret=ssl3_send_finished(s,
527                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
528                                 s->method->ssl3_enc->server_finished_label,
529                                 s->method->ssl3_enc->server_finished_label_len);
530                         if (ret <= 0) goto end;
531                         s->state=SSL3_ST_SW_FLUSH;
532                         if (s->hit)
533                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
534                         else
535                                 s->s3->tmp.next_state=SSL_ST_OK;
536                         s->init_num=0;
537                         break;
538
539                 case SSL_ST_OK:
540                         /* clean a few things up */
541                         ssl3_cleanup_key_block(s);
542
543                         BUF_MEM_free(s->init_buf);
544                         s->init_buf=NULL;
545
546                         /* remove buffering on output */
547                         ssl_free_wbio_buffer(s);
548
549                         s->init_num=0;
550
551                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
552                                 {
553                                 /* actually not necessarily a 'new' session unless
554                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
555                                 
556                                 s->new_session=0;
557                                 
558                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
559                                 
560                                 s->ctx->stats.sess_accept_good++;
561                                 /* s->server=1; */
562                                 s->handshake_func=ssl3_accept;
563
564                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
565                                 }
566                         
567                         ret = 1;
568                         goto end;
569                         /* break; */
570
571                 default:
572                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
573                         ret= -1;
574                         goto end;
575                         /* break; */
576                         }
577                 
578                 if (!s->s3->tmp.reuse_message && !skip)
579                         {
580                         if (s->debug)
581                                 {
582                                 if ((ret=BIO_flush(s->wbio)) <= 0)
583                                         goto end;
584                                 }
585
586
587                         if ((cb != NULL) && (s->state != state))
588                                 {
589                                 new_state=s->state;
590                                 s->state=state;
591                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
592                                 s->state=new_state;
593                                 }
594                         }
595                 skip=0;
596                 }
597 end:
598         /* BIO_flush(s->wbio); */
599
600         s->in_handshake--;
601         if (cb != NULL)
602                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
603         return(ret);
604         }
605
606 int ssl3_send_hello_request(SSL *s)
607         {
608         unsigned char *p;
609
610         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
611                 {
612                 p=(unsigned char *)s->init_buf->data;
613                 *(p++)=SSL3_MT_HELLO_REQUEST;
614                 *(p++)=0;
615                 *(p++)=0;
616                 *(p++)=0;
617
618                 s->state=SSL3_ST_SW_HELLO_REQ_B;
619                 /* number of bytes to write */
620                 s->init_num=4;
621                 s->init_off=0;
622                 }
623
624         /* SSL3_ST_SW_HELLO_REQ_B */
625         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
626         }
627
628 int ssl3_check_client_hello(SSL *s)
629         {
630         int ok;
631         long n;
632
633         /* this function is called when we really expect a Certificate message,
634          * so permit appropriate message length */
635         n=s->method->ssl_get_message(s,
636                 SSL3_ST_SR_CERT_A,
637                 SSL3_ST_SR_CERT_B,
638                 -1,
639                 s->max_cert_list,
640                 &ok);
641         if (!ok) return((int)n);
642         s->s3->tmp.reuse_message = 1;
643         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
644                 {
645                 /* Throw away what we have done so far in the current handshake,
646                  * which will now be aborted. (A full SSL_clear would be too much.)
647                  * I hope that tmp.dh is the only thing that may need to be cleared
648                  * when a handshake is not completed ... */
649 #ifndef OPENSSL_NO_DH
650                 if (s->s3->tmp.dh != NULL)
651                         {
652                         DH_free(s->s3->tmp.dh);
653                         s->s3->tmp.dh = NULL;
654                         }
655 #endif
656                 return 2;
657                 }
658         return 1;
659 }
660
661 int ssl3_get_client_hello(SSL *s)
662         {
663         int i,j,ok,al,ret= -1;
664         unsigned int cookie_len;
665         long n;
666         unsigned long id;
667         unsigned char *p,*d,*q;
668         SSL_CIPHER *c;
669         SSL_COMP *comp=NULL;
670         STACK_OF(SSL_CIPHER) *ciphers=NULL;
671
672         /* We do this so that we will respond with our native type.
673          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
674          * This down switching should be handled by a different method.
675          * If we are SSLv3, we will respond with SSLv3, even if prompted with
676          * TLSv1.
677          */
678         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
679                 {
680                 s->first_packet=1;
681                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
682                 }
683         n=s->method->ssl_get_message(s,
684                 SSL3_ST_SR_CLNT_HELLO_B,
685                 SSL3_ST_SR_CLNT_HELLO_C,
686                 SSL3_MT_CLIENT_HELLO,
687                 SSL3_RT_MAX_PLAIN_LENGTH,
688                 &ok);
689
690         if (!ok) return((int)n);
691         d=p=(unsigned char *)s->init_msg;
692
693         /* use version from inside client hello, not from record header
694          * (may differ: see RFC 2246, Appendix E, second paragraph) */
695         s->client_version=(((int)p[0])<<8)|(int)p[1];
696         p+=2;
697
698         if (s->client_version < s->version)
699                 {
700                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
701                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR) 
702                         {
703                         /* similar to ssl3_get_record, send alert using remote version number */
704                         s->version = s->client_version;
705                         }
706                 al = SSL_AD_PROTOCOL_VERSION;
707                 goto f_err;
708                 }
709
710         /* load the client random */
711         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
712         p+=SSL3_RANDOM_SIZE;
713
714         /* get the session-id */
715         j= *(p++);
716
717         s->hit=0;
718         /* Versions before 0.9.7 always allow session reuse during renegotiation
719          * (i.e. when s->new_session is true), option
720          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
721          * Maybe this optional behaviour should always have been the default,
722          * but we cannot safely change the default behaviour (or new applications
723          * might be written that become totally unsecure when compiled with
724          * an earlier library version)
725          */
726         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
727                 {
728                 if (!ssl_get_new_session(s,1))
729                         goto err;
730                 }
731         else
732                 {
733                 i=ssl_get_prev_session(s,p,j);
734                 if (i == 1)
735                         { /* previous session */
736                         s->hit=1;
737                         }
738                 else if (i == -1)
739                         goto err;
740                 else /* i == 0 */
741                         {
742                         if (!ssl_get_new_session(s,1))
743                                 goto err;
744                         }
745                 }
746
747         p+=j;
748
749         if (SSL_version(s) == DTLS1_VERSION)
750                 {
751                 /* cookie stuff */
752                 cookie_len = *(p++);
753
754                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
755                         s->d1->send_cookie == 0)
756                         {
757                         /* HelloVerifyMessage has already been sent */
758                         if ( cookie_len != s->d1->cookie_len)
759                                 {
760                                 al = SSL_AD_HANDSHAKE_FAILURE;
761                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
762                                 goto f_err;
763                                 }
764                         }
765
766                 /* 
767                  * The ClientHello may contain a cookie even if the
768                  * HelloVerify message has not been sent--make sure that it
769                  * does not cause an overflow.
770                  */
771                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
772                         {
773                         /* too much data */
774                         al = SSL_AD_DECODE_ERROR;
775                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
776                         goto f_err;
777                         }
778
779                 /* verify the cookie if appropriate option is set. */
780                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
781                         cookie_len > 0)
782                         {
783                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
784
785                         if ( s->ctx->app_verify_cookie_cb != NULL)
786                                 {
787                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
788                                         cookie_len) == 0)
789                                         {
790                                         al=SSL_AD_HANDSHAKE_FAILURE;
791                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
792                                                 SSL_R_COOKIE_MISMATCH);
793                                         goto f_err;
794                                         }
795                                 /* else cookie verification succeeded */
796                                 }
797                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie, 
798                                                   s->d1->cookie_len) != 0) /* default verification */
799                                 {
800                                         al=SSL_AD_HANDSHAKE_FAILURE;
801                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, 
802                                                 SSL_R_COOKIE_MISMATCH);
803                                         goto f_err;
804                                 }
805                         }
806
807                 p += cookie_len;
808                 }
809
810         n2s(p,i);
811         if ((i == 0) && (j != 0))
812                 {
813                 /* we need a cipher if we are not resuming a session */
814                 al=SSL_AD_ILLEGAL_PARAMETER;
815                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
816                 goto f_err;
817                 }
818         if ((p+i) >= (d+n))
819                 {
820                 /* not enough data */
821                 al=SSL_AD_DECODE_ERROR;
822                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
823                 goto f_err;
824                 }
825         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
826                 == NULL))
827                 {
828                 goto err;
829                 }
830         p+=i;
831
832         /* If it is a hit, check that the cipher is in the list */
833         if ((s->hit) && (i > 0))
834                 {
835                 j=0;
836                 id=s->session->cipher->id;
837
838 #ifdef CIPHER_DEBUG
839                 printf("client sent %d ciphers\n",sk_num(ciphers));
840 #endif
841                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
842                         {
843                         c=sk_SSL_CIPHER_value(ciphers,i);
844 #ifdef CIPHER_DEBUG
845                         printf("client [%2d of %2d]:%s\n",
846                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
847 #endif
848                         if (c->id == id)
849                                 {
850                                 j=1;
851                                 break;
852                                 }
853                         }
854                 if (j == 0)
855                         {
856                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
857                                 {
858                                 /* Very bad for multi-threading.... */
859                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers, 0);
860                                 }
861                         else
862                                 {
863                                 /* we need to have the cipher in the cipher
864                                  * list if we are asked to reuse it */
865                                 al=SSL_AD_ILLEGAL_PARAMETER;
866                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
867                                 goto f_err;
868                                 }
869                         }
870                 }
871
872         /* compression */
873         i= *(p++);
874         if ((p+i) > (d+n))
875                 {
876                 /* not enough data */
877                 al=SSL_AD_DECODE_ERROR;
878                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
879                 goto f_err;
880                 }
881         q=p;
882         for (j=0; j<i; j++)
883                 {
884                 if (p[j] == 0) break;
885                 }
886
887         p+=i;
888         if (j >= i)
889                 {
890                 /* no compress */
891                 al=SSL_AD_DECODE_ERROR;
892                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
893                 goto f_err;
894                 }
895
896         /* Worst case, we will use the NULL compression, but if we have other
897          * options, we will now look for them.  We have i-1 compression
898          * algorithms from the client, starting at q. */
899         s->s3->tmp.new_compression=NULL;
900         if (s->ctx->comp_methods != NULL)
901                 { /* See if we have a match */
902                 int m,nn,o,v,done=0;
903
904                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
905                 for (m=0; m<nn; m++)
906                         {
907                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
908                         v=comp->id;
909                         for (o=0; o<i; o++)
910                                 {
911                                 if (v == q[o])
912                                         {
913                                         done=1;
914                                         break;
915                                         }
916                                 }
917                         if (done) break;
918                         }
919                 if (done)
920                         s->s3->tmp.new_compression=comp;
921                 else
922                         comp=NULL;
923                 }
924
925         /* TLS does not mind if there is extra stuff */
926 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
927          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
928          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
929         if (s->version == SSL3_VERSION)
930                 {
931                 if (p < (d+n))
932                         {
933                         /* wrong number of bytes,
934                          * there could be more to follow */
935                         al=SSL_AD_DECODE_ERROR;
936                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
937                         goto f_err;
938                         }
939                 }
940 #endif
941
942         /* Given s->session->ciphers and SSL_get_ciphers, we must
943          * pick a cipher */
944
945         if (!s->hit)
946                 {
947                 s->session->compress_meth=(comp == NULL)?0:comp->id;
948                 if (s->session->ciphers != NULL)
949                         sk_SSL_CIPHER_free(s->session->ciphers);
950                 s->session->ciphers=ciphers;
951                 if (ciphers == NULL)
952                         {
953                         al=SSL_AD_ILLEGAL_PARAMETER;
954                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
955                         goto f_err;
956                         }
957                 ciphers=NULL;
958                 c=ssl3_choose_cipher(s,s->session->ciphers,
959                                      SSL_get_ciphers(s));
960
961                 if (c == NULL)
962                         {
963                         al=SSL_AD_HANDSHAKE_FAILURE;
964                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
965                         goto f_err;
966                         }
967                 s->s3->tmp.new_cipher=c;
968                 }
969         else
970                 {
971                 /* Session-id reuse */
972 #ifdef REUSE_CIPHER_BUG
973                 STACK_OF(SSL_CIPHER) *sk;
974                 SSL_CIPHER *nc=NULL;
975                 SSL_CIPHER *ec=NULL;
976
977                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
978                         {
979                         sk=s->session->ciphers;
980                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
981                                 {
982                                 c=sk_SSL_CIPHER_value(sk,i);
983                                 if (c->algorithms & SSL_eNULL)
984                                         nc=c;
985                                 if (SSL_C_IS_EXPORT(c))
986                                         ec=c;
987                                 }
988                         if (nc != NULL)
989                                 s->s3->tmp.new_cipher=nc;
990                         else if (ec != NULL)
991                                 s->s3->tmp.new_cipher=ec;
992                         else
993                                 s->s3->tmp.new_cipher=s->session->cipher;
994                         }
995                 else
996 #endif
997                 s->s3->tmp.new_cipher=s->session->cipher;
998                 }
999         
1000         /* we now have the following setup. 
1001          * client_random
1002          * cipher_list          - our prefered list of ciphers
1003          * ciphers              - the clients prefered list of ciphers
1004          * compression          - basically ignored right now
1005          * ssl version is set   - sslv3
1006          * s->session           - The ssl session has been setup.
1007          * s->hit               - session reuse flag
1008          * s->tmp.new_cipher    - the new cipher to use.
1009          */
1010
1011         ret=1;
1012         if (0)
1013                 {
1014 f_err:
1015                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1016                 }
1017 err:
1018         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1019         return(ret);
1020         }
1021
1022 int ssl3_send_server_hello(SSL *s)
1023         {
1024         unsigned char *buf;
1025         unsigned char *p,*d;
1026         int i,sl;
1027         unsigned long l,Time;
1028
1029         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1030                 {
1031                 buf=(unsigned char *)s->init_buf->data;
1032                 p=s->s3->server_random;
1033                 Time=time(NULL);                        /* Time */
1034                 l2n(Time,p);
1035                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1036                         return -1;
1037                 /* Do the message type and length last */
1038                 d=p= &(buf[4]);
1039
1040                 *(p++)=s->version>>8;
1041                 *(p++)=s->version&0xff;
1042
1043                 /* Random stuff */
1044                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1045                 p+=SSL3_RANDOM_SIZE;
1046
1047                 /* now in theory we have 3 options to sending back the
1048                  * session id.  If it is a re-use, we send back the
1049                  * old session-id, if it is a new session, we send
1050                  * back the new session-id or we send back a 0 length
1051                  * session-id if we want it to be single use.
1052                  * Currently I will not implement the '0' length session-id
1053                  * 12-Jan-98 - I'll now support the '0' length stuff.
1054                  */
1055                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1056                         s->session->session_id_length=0;
1057
1058                 sl=s->session->session_id_length;
1059                 if (sl > (int)sizeof(s->session->session_id))
1060                         {
1061                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1062                         return -1;
1063                         }
1064                 *(p++)=sl;
1065                 memcpy(p,s->session->session_id,sl);
1066                 p+=sl;
1067
1068                 /* put the cipher */
1069                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1070                 p+=i;
1071
1072                 /* put the compression method */
1073                 if (s->s3->tmp.new_compression == NULL)
1074                         *(p++)=0;
1075                 else
1076                         *(p++)=s->s3->tmp.new_compression->id;
1077
1078                 /* do the header */
1079                 l=(p-d);
1080                 d=buf;
1081                 *(d++)=SSL3_MT_SERVER_HELLO;
1082                 l2n3(l,d);
1083
1084                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1085                 /* number of bytes to write */
1086                 s->init_num=p-buf;
1087                 s->init_off=0;
1088                 }
1089
1090         /* SSL3_ST_CW_CLNT_HELLO_B */
1091         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1092         }
1093
1094 int ssl3_send_server_done(SSL *s)
1095         {
1096         unsigned char *p;
1097
1098         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1099                 {
1100                 p=(unsigned char *)s->init_buf->data;
1101
1102                 /* do the header */
1103                 *(p++)=SSL3_MT_SERVER_DONE;
1104                 *(p++)=0;
1105                 *(p++)=0;
1106                 *(p++)=0;
1107
1108                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1109                 /* number of bytes to write */
1110                 s->init_num=4;
1111                 s->init_off=0;
1112                 }
1113
1114         /* SSL3_ST_CW_CLNT_HELLO_B */
1115         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1116         }
1117
1118 int ssl3_send_server_key_exchange(SSL *s)
1119         {
1120 #ifndef OPENSSL_NO_RSA
1121         unsigned char *q;
1122         int j,num;
1123         RSA *rsa;
1124         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1125         unsigned int u;
1126 #endif
1127 #ifndef OPENSSL_NO_DH
1128         DH *dh=NULL,*dhp;
1129 #endif
1130 #ifndef OPENSSL_NO_ECDH
1131         EC_KEY *ecdh=NULL, *ecdhp;
1132         unsigned char *encodedPoint = NULL;
1133         int encodedlen = 0;
1134         int curve_id = 0;
1135         BN_CTX *bn_ctx = NULL; 
1136 #endif
1137         EVP_PKEY *pkey;
1138         unsigned char *p,*d;
1139         int al,i;
1140         unsigned long type;
1141         int n;
1142         CERT *cert;
1143         BIGNUM *r[4];
1144         int nr[4],kn;
1145         BUF_MEM *buf;
1146         EVP_MD_CTX md_ctx;
1147
1148         EVP_MD_CTX_init(&md_ctx);
1149         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1150                 {
1151                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1152                 cert=s->cert;
1153
1154                 buf=s->init_buf;
1155
1156                 r[0]=r[1]=r[2]=r[3]=NULL;
1157                 n=0;
1158 #ifndef OPENSSL_NO_RSA
1159                 if (type & SSL_kRSA)
1160                         {
1161                         rsa=cert->rsa_tmp;
1162                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1163                                 {
1164                                 rsa=s->cert->rsa_tmp_cb(s,
1165                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1166                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1167                                 if(rsa == NULL)
1168                                 {
1169                                         al=SSL_AD_HANDSHAKE_FAILURE;
1170                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1171                                         goto f_err;
1172                                 }
1173                                 RSA_up_ref(rsa);
1174                                 cert->rsa_tmp=rsa;
1175                                 }
1176                         if (rsa == NULL)
1177                                 {
1178                                 al=SSL_AD_HANDSHAKE_FAILURE;
1179                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1180                                 goto f_err;
1181                                 }
1182                         r[0]=rsa->n;
1183                         r[1]=rsa->e;
1184                         s->s3->tmp.use_rsa_tmp=1;
1185                         }
1186                 else
1187 #endif
1188 #ifndef OPENSSL_NO_DH
1189                         if (type & SSL_kEDH)
1190                         {
1191                         dhp=cert->dh_tmp;
1192                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1193                                 dhp=s->cert->dh_tmp_cb(s,
1194                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1195                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1196                         if (dhp == NULL)
1197                                 {
1198                                 al=SSL_AD_HANDSHAKE_FAILURE;
1199                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1200                                 goto f_err;
1201                                 }
1202
1203                         if (s->s3->tmp.dh != NULL)
1204                                 {
1205                                 DH_free(dh);
1206                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1207                                 goto err;
1208                                 }
1209
1210                         if ((dh=DHparams_dup(dhp)) == NULL)
1211                                 {
1212                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1213                                 goto err;
1214                                 }
1215
1216                         s->s3->tmp.dh=dh;
1217                         if ((dhp->pub_key == NULL ||
1218                              dhp->priv_key == NULL ||
1219                              (s->options & SSL_OP_SINGLE_DH_USE)))
1220                                 {
1221                                 if(!DH_generate_key(dh))
1222                                     {
1223                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1224                                            ERR_R_DH_LIB);
1225                                     goto err;
1226                                     }
1227                                 }
1228                         else
1229                                 {
1230                                 dh->pub_key=BN_dup(dhp->pub_key);
1231                                 dh->priv_key=BN_dup(dhp->priv_key);
1232                                 if ((dh->pub_key == NULL) ||
1233                                         (dh->priv_key == NULL))
1234                                         {
1235                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1236                                         goto err;
1237                                         }
1238                                 }
1239                         r[0]=dh->p;
1240                         r[1]=dh->g;
1241                         r[2]=dh->pub_key;
1242                         }
1243                 else 
1244 #endif
1245 #ifndef OPENSSL_NO_ECDH
1246                         if (type & SSL_kECDHE)
1247                         {
1248                         const EC_GROUP *group;
1249
1250                         ecdhp=cert->ecdh_tmp;
1251                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1252                                 {
1253                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1254                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1255                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1256                                 }
1257                         if (ecdhp == NULL)
1258                                 {
1259                                 al=SSL_AD_HANDSHAKE_FAILURE;
1260                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1261                                 goto f_err;
1262                                 }
1263
1264                         if (s->s3->tmp.ecdh != NULL)
1265                                 {
1266                                 EC_KEY_free(s->s3->tmp.ecdh); 
1267                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1268                                 goto err;
1269                                 }
1270
1271                         /* Duplicate the ECDH structure. */
1272                         if (ecdhp == NULL)
1273                                 {
1274                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1275                                 goto err;
1276                                 }
1277                         if (!EC_KEY_up_ref(ecdhp))
1278                                 {
1279                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1280                                 goto err;
1281                                 }
1282                         ecdh = ecdhp;
1283
1284                         s->s3->tmp.ecdh=ecdh;
1285                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1286                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1287                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1288                                 {
1289                                 if(!EC_KEY_generate_key(ecdh))
1290                                     {
1291                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1292                                     goto err;
1293                                     }
1294                                 }
1295
1296                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1297                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1298                             (EC_KEY_get0_private_key(ecdh) == NULL))
1299                                 {
1300                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1301                                 goto err;
1302                                 }
1303
1304                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1305                             (EC_GROUP_get_degree(group) > 163)) 
1306                                 {
1307                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1308                                 goto err;
1309                                 }
1310
1311                         /* XXX: For now, we only support ephemeral ECDH
1312                          * keys over named (not generic) curves. For 
1313                          * supported named curves, curve_id is non-zero.
1314                          */
1315                         if ((curve_id = 
1316                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1317                             == 0)
1318                                 {
1319                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1320                                 goto err;
1321                                 }
1322
1323                         /* Encode the public key.
1324                          * First check the size of encoding and
1325                          * allocate memory accordingly.
1326                          */
1327                         encodedlen = EC_POINT_point2oct(group, 
1328                             EC_KEY_get0_public_key(ecdh),
1329                             POINT_CONVERSION_UNCOMPRESSED, 
1330                             NULL, 0, NULL);
1331
1332                         encodedPoint = (unsigned char *) 
1333                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1334                         bn_ctx = BN_CTX_new();
1335                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1336                                 {
1337                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1338                                 goto err;
1339                                 }
1340
1341
1342                         encodedlen = EC_POINT_point2oct(group, 
1343                             EC_KEY_get0_public_key(ecdh), 
1344                             POINT_CONVERSION_UNCOMPRESSED, 
1345                             encodedPoint, encodedlen, bn_ctx);
1346
1347                         if (encodedlen == 0) 
1348                                 {
1349                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1350                                 goto err;
1351                                 }
1352
1353                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1354
1355                         /* XXX: For now, we only support named (not 
1356                          * generic) curves in ECDH ephemeral key exchanges.
1357                          * In this situation, we need three additional bytes
1358                          * to encode the entire ServerECDHParams
1359                          * structure. 
1360                          */
1361                         n = 3 + encodedlen;
1362
1363                         /* We'll generate the serverKeyExchange message
1364                          * explicitly so we can set these to NULLs
1365                          */
1366                         r[0]=NULL;
1367                         r[1]=NULL;
1368                         r[2]=NULL;
1369                         }
1370                 else 
1371 #endif /* !OPENSSL_NO_ECDH */
1372                         {
1373                         al=SSL_AD_HANDSHAKE_FAILURE;
1374                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1375                         goto f_err;
1376                         }
1377                 for (i=0; r[i] != NULL; i++)
1378                         {
1379                         nr[i]=BN_num_bytes(r[i]);
1380                         n+=2+nr[i];
1381                         }
1382
1383                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1384                         {
1385                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1386                                 == NULL)
1387                                 {
1388                                 al=SSL_AD_DECODE_ERROR;
1389                                 goto f_err;
1390                                 }
1391                         kn=EVP_PKEY_size(pkey);
1392                         }
1393                 else
1394                         {
1395                         pkey=NULL;
1396                         kn=0;
1397                         }
1398
1399                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1400                         {
1401                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1402                         goto err;
1403                         }
1404                 d=(unsigned char *)s->init_buf->data;
1405                 p= &(d[4]);
1406
1407                 for (i=0; r[i] != NULL; i++)
1408                         {
1409                         s2n(nr[i],p);
1410                         BN_bn2bin(r[i],p);
1411                         p+=nr[i];
1412                         }
1413
1414 #ifndef OPENSSL_NO_ECDH
1415                 if (type & SSL_kECDHE) 
1416                         {
1417                         /* XXX: For now, we only support named (not generic) curves.
1418                          * In this situation, the serverKeyExchange message has:
1419                          * [1 byte CurveType], [1 byte CurveName]
1420                          * [1 byte length of encoded point], followed by
1421                          * the actual encoded point itself
1422                          */
1423                         *p = NAMED_CURVE_TYPE;
1424                         p += 1;
1425                         *p = curve_id;
1426                         p += 1;
1427                         *p = encodedlen;
1428                         p += 1;
1429                         memcpy((unsigned char*)p, 
1430                             (unsigned char *)encodedPoint, 
1431                             encodedlen);
1432                         OPENSSL_free(encodedPoint);
1433                         p += encodedlen;
1434                         }
1435 #endif
1436
1437                 /* not anonymous */
1438                 if (pkey != NULL)
1439                         {
1440                         /* n is the length of the params, they start at &(d[4])
1441                          * and p points to the space at the end. */
1442 #ifndef OPENSSL_NO_RSA
1443                         if (pkey->type == EVP_PKEY_RSA)
1444                                 {
1445                                 q=md_buf;
1446                                 j=0;
1447                                 for (num=2; num > 0; num--)
1448                                         {
1449                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1450                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1451                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1452                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1453                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1454                                         EVP_DigestFinal_ex(&md_ctx,q,
1455                                                 (unsigned int *)&i);
1456                                         q+=i;
1457                                         j+=i;
1458                                         }
1459                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1460                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1461                                         {
1462                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1463                                         goto err;
1464                                         }
1465                                 s2n(u,p);
1466                                 n+=u+2;
1467                                 }
1468                         else
1469 #endif
1470 #if !defined(OPENSSL_NO_DSA)
1471                                 if (pkey->type == EVP_PKEY_DSA)
1472                                 {
1473                                 /* lets do DSS */
1474                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1475                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1476                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1477                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1478                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1479                                         (unsigned int *)&i,pkey))
1480                                         {
1481                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1482                                         goto err;
1483                                         }
1484                                 s2n(i,p);
1485                                 n+=i+2;
1486                                 }
1487                         else
1488 #endif
1489 #if !defined(OPENSSL_NO_ECDSA)
1490                                 if (pkey->type == EVP_PKEY_EC)
1491                                 {
1492                                 /* let's do ECDSA */
1493                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1494                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1495                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1496                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1497                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1498                                         (unsigned int *)&i,pkey))
1499                                         {
1500                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1501                                         goto err;
1502                                         }
1503                                 s2n(i,p);
1504                                 n+=i+2;
1505                                 }
1506                         else
1507 #endif
1508                                 {
1509                                 /* Is this error check actually needed? */
1510                                 al=SSL_AD_HANDSHAKE_FAILURE;
1511                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1512                                 goto f_err;
1513                                 }
1514                         }
1515
1516                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1517                 l2n3(n,d);
1518
1519                 /* we should now have things packed up, so lets send
1520                  * it off */
1521                 s->init_num=n+4;
1522                 s->init_off=0;
1523                 }
1524
1525         s->state = SSL3_ST_SW_KEY_EXCH_B;
1526         EVP_MD_CTX_cleanup(&md_ctx);
1527         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1528 f_err:
1529         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1530 err:
1531 #ifndef OPENSSL_NO_ECDH
1532         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1533         BN_CTX_free(bn_ctx);
1534 #endif
1535         EVP_MD_CTX_cleanup(&md_ctx);
1536         return(-1);
1537         }
1538
1539 int ssl3_send_certificate_request(SSL *s)
1540         {
1541         unsigned char *p,*d;
1542         int i,j,nl,off,n;
1543         STACK_OF(X509_NAME) *sk=NULL;
1544         X509_NAME *name;
1545         BUF_MEM *buf;
1546
1547         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1548                 {
1549                 buf=s->init_buf;
1550
1551                 d=p=(unsigned char *)&(buf->data[4]);
1552
1553                 /* get the list of acceptable cert types */
1554                 p++;
1555                 n=ssl3_get_req_cert_type(s,p);
1556                 d[0]=n;
1557                 p+=n;
1558                 n++;
1559
1560                 off=n;
1561                 p+=2;
1562                 n+=2;
1563
1564                 sk=SSL_get_client_CA_list(s);
1565                 nl=0;
1566                 if (sk != NULL)
1567                         {
1568                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1569                                 {
1570                                 name=sk_X509_NAME_value(sk,i);
1571                                 j=i2d_X509_NAME(name,NULL);
1572                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1573                                         {
1574                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1575                                         goto err;
1576                                         }
1577                                 p=(unsigned char *)&(buf->data[4+n]);
1578                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1579                                         {
1580                                         s2n(j,p);
1581                                         i2d_X509_NAME(name,&p);
1582                                         n+=2+j;
1583                                         nl+=2+j;
1584                                         }
1585                                 else
1586                                         {
1587                                         d=p;
1588                                         i2d_X509_NAME(name,&p);
1589                                         j-=2; s2n(j,d); j+=2;
1590                                         n+=j;
1591                                         nl+=j;
1592                                         }
1593                                 }
1594                         }
1595                 /* else no CA names */
1596                 p=(unsigned char *)&(buf->data[4+off]);
1597                 s2n(nl,p);
1598
1599                 d=(unsigned char *)buf->data;
1600                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1601                 l2n3(n,d);
1602
1603                 /* we should now have things packed up, so lets send
1604                  * it off */
1605
1606                 s->init_num=n+4;
1607                 s->init_off=0;
1608 #ifdef NETSCAPE_HANG_BUG
1609                 p=(unsigned char *)s->init_buf->data + s->init_num;
1610
1611                 /* do the header */
1612                 *(p++)=SSL3_MT_SERVER_DONE;
1613                 *(p++)=0;
1614                 *(p++)=0;
1615                 *(p++)=0;
1616                 s->init_num += 4;
1617 #endif
1618
1619                 s->state = SSL3_ST_SW_CERT_REQ_B;
1620                 }
1621
1622         /* SSL3_ST_SW_CERT_REQ_B */
1623         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1624 err:
1625         return(-1);
1626         }
1627
1628
1629 #ifndef OPENSSL_NO_ECDH
1630 static const int KDF1_SHA1_len = 20;
1631 static void *KDF1_SHA1(const void *in, size_t inlen, void *out, size_t *outlen)
1632         {
1633 #ifndef OPENSSL_NO_SHA
1634         if (*outlen < SHA_DIGEST_LENGTH)
1635                 return NULL;
1636         else
1637                 *outlen = SHA_DIGEST_LENGTH;
1638         return SHA1(in, inlen, out);
1639 #else
1640         return NULL;
1641 #endif  /* OPENSSL_NO_SHA */
1642         }
1643 #endif  /* OPENSSL_NO_ECDH */
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                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2001
2002                 s->session->master_key_length=
2003                         s->method->ssl3_enc->generate_master_secret(s,
2004                                 s->session->master_key, pms, outl);
2005
2006                 if (kssl_ctx->client_princ)
2007                         {
2008                         int len = strlen(kssl_ctx->client_princ);
2009                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH ) 
2010                                 {
2011                                 s->session->krb5_client_princ_len = len;
2012                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2013                                 }
2014                         }
2015
2016
2017                 /*  Was doing kssl_ctx_free() here,
2018                 **  but it caused problems for apache.
2019                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2020                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2021                 */
2022                 }
2023         else
2024 #endif  /* OPENSSL_NO_KRB5 */
2025
2026 #ifndef OPENSSL_NO_ECDH
2027                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2028                 {
2029                 int ret = 1;
2030                 int field_size = 0;
2031                 const EC_KEY   *tkey;
2032                 const EC_GROUP *group;
2033                 const BIGNUM *priv_key;
2034
2035                 /* initialize structures for server's ECDH key pair */
2036                 if ((srvr_ecdh = EC_KEY_new()) == NULL) 
2037                         {
2038                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2039                             ERR_R_MALLOC_FAILURE);
2040                         goto err;
2041                         }
2042
2043                 /* Let's get server private key and group information */
2044                 if (l & SSL_kECDH) 
2045                         { 
2046                         /* use the certificate */
2047                         tkey = s->cert->key->privatekey->pkey.ec;
2048                         }
2049                 else
2050                         {
2051                         /* use the ephermeral values we saved when
2052                          * generating the ServerKeyExchange msg.
2053                          */
2054                         tkey = s->s3->tmp.ecdh;
2055                         }
2056
2057                 group    = EC_KEY_get0_group(tkey);
2058                 priv_key = EC_KEY_get0_private_key(tkey);
2059
2060                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2061                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2062                         {
2063                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2064                                ERR_R_EC_LIB);
2065                         goto err;
2066                         }
2067
2068                 /* Let's get client's public key */
2069                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2070                         {
2071                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2072                             ERR_R_MALLOC_FAILURE);
2073                         goto err;
2074                         }
2075
2076                 if (n == 0L) 
2077                         {
2078                         /* Client Publickey was in Client Certificate */
2079
2080                          if (l & SSL_kECDHE) 
2081                                  {
2082                                  al=SSL_AD_HANDSHAKE_FAILURE;
2083                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2084                                  goto f_err;
2085                                  }
2086                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2087                             == NULL) || 
2088                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2089                                 {
2090                                 /* XXX: For now, we do not support client
2091                                  * authentication using ECDH certificates
2092                                  * so this branch (n == 0L) of the code is
2093                                  * never executed. When that support is
2094                                  * added, we ought to ensure the key 
2095                                  * received in the certificate is 
2096                                  * authorized for key agreement.
2097                                  * ECDH_compute_key implicitly checks that
2098                                  * the two ECDH shares are for the same
2099                                  * group.
2100                                  */
2101                                 al=SSL_AD_HANDSHAKE_FAILURE;
2102                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2103                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2104                                 goto f_err;
2105                                 }
2106
2107                         EC_POINT_copy(clnt_ecpoint,
2108                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec));
2109                         ret = 2; /* Skip certificate verify processing */
2110                         }
2111                 else
2112                         {
2113                         /* Get client's public key from encoded point
2114                          * in the ClientKeyExchange message.
2115                          */
2116                         if ((bn_ctx = BN_CTX_new()) == NULL)
2117                                 {
2118                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2119                                     ERR_R_MALLOC_FAILURE);
2120                                 goto err;
2121                                 }
2122
2123                         /* Get encoded point length */
2124                         i = *p; 
2125                         p += 1;
2126                         if (EC_POINT_oct2point(group, 
2127                             clnt_ecpoint, p, i, bn_ctx) == 0)
2128                                 {
2129                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2130                                     ERR_R_EC_LIB);
2131                                 goto err;
2132                                 }
2133                         /* p is pointing to somewhere in the buffer
2134                          * currently, so set it to the start 
2135                          */ 
2136                         p=(unsigned char *)s->init_buf->data;
2137                         }
2138
2139                 /* Compute the shared pre-master secret */
2140                 field_size = EC_GROUP_get_degree(group);
2141                 if (field_size <= 0)
2142                         {
2143                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, 
2144                                ERR_R_ECDH_LIB);
2145                         goto err;
2146                         }
2147                 /* If field size is not more than 24 octets, then use SHA-1 hash of result;
2148                  * otherwise, use result (see section 4.8 of draft-ietf-tls-ecc-03.txt;
2149                  * this is new with this version of the Internet Draft).
2150                  */
2151                 if (field_size <= 24 * 8)
2152                     i = ECDH_compute_key(p, KDF1_SHA1_len, clnt_ecpoint, srvr_ecdh, KDF1_SHA1);
2153                 else
2154                     i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2155                 if (i <= 0)
2156                         {
2157                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2158                             ERR_R_ECDH_LIB);
2159                         goto err;
2160                         }
2161
2162                 EVP_PKEY_free(clnt_pub_pkey);
2163                 EC_POINT_free(clnt_ecpoint);
2164                 if (srvr_ecdh != NULL) 
2165                         EC_KEY_free(srvr_ecdh);
2166                 BN_CTX_free(bn_ctx);
2167
2168                 /* Compute the master secret */
2169                 s->session->master_key_length = s->method->ssl3_enc-> \
2170                     generate_master_secret(s, s->session->master_key, p, i);
2171                 
2172                 OPENSSL_cleanse(p, i);
2173                 return (ret);
2174                 }
2175         else
2176 #endif
2177                 {
2178                 al=SSL_AD_HANDSHAKE_FAILURE;
2179                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2180                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2181                 goto f_err;
2182                 }
2183
2184         return(1);
2185 f_err:
2186         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2187 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2188 err:
2189 #endif
2190 #ifndef OPENSSL_NO_ECDH
2191         EVP_PKEY_free(clnt_pub_pkey);
2192         EC_POINT_free(clnt_ecpoint);
2193         if (srvr_ecdh != NULL) 
2194                 EC_KEY_free(srvr_ecdh);
2195         BN_CTX_free(bn_ctx);
2196 #endif
2197         return(-1);
2198         }
2199
2200 int ssl3_get_cert_verify(SSL *s)
2201         {
2202         EVP_PKEY *pkey=NULL;
2203         unsigned char *p;
2204         int al,ok,ret=0;
2205         long n;
2206         int type=0,i,j;
2207         X509 *peer;
2208
2209         n=s->method->ssl_get_message(s,
2210                 SSL3_ST_SR_CERT_VRFY_A,
2211                 SSL3_ST_SR_CERT_VRFY_B,
2212                 -1,
2213                 514, /* 514? */
2214                 &ok);
2215
2216         if (!ok) return((int)n);
2217
2218         if (s->session->peer != NULL)
2219                 {
2220                 peer=s->session->peer;
2221                 pkey=X509_get_pubkey(peer);
2222                 type=X509_certificate_type(peer,pkey);
2223                 }
2224         else
2225                 {
2226                 peer=NULL;
2227                 pkey=NULL;
2228                 }
2229
2230         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2231                 {
2232                 s->s3->tmp.reuse_message=1;
2233                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2234                         {
2235                         al=SSL_AD_UNEXPECTED_MESSAGE;
2236                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2237                         goto f_err;
2238                         }
2239                 ret=1;
2240                 goto end;
2241                 }
2242
2243         if (peer == NULL)
2244                 {
2245                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2246                 al=SSL_AD_UNEXPECTED_MESSAGE;
2247                 goto f_err;
2248                 }
2249
2250         if (!(type & EVP_PKT_SIGN))
2251                 {
2252                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2253                 al=SSL_AD_ILLEGAL_PARAMETER;
2254                 goto f_err;
2255                 }
2256
2257         if (s->s3->change_cipher_spec)
2258                 {
2259                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2260                 al=SSL_AD_UNEXPECTED_MESSAGE;
2261                 goto f_err;
2262                 }
2263
2264         /* we now have a signature that we need to verify */
2265         p=(unsigned char *)s->init_msg;
2266         n2s(p,i);
2267         n-=2;
2268         if (i > n)
2269                 {
2270                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2271                 al=SSL_AD_DECODE_ERROR;
2272                 goto f_err;
2273                 }
2274
2275         j=EVP_PKEY_size(pkey);
2276         if ((i > j) || (n > j) || (n <= 0))
2277                 {
2278                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2279                 al=SSL_AD_DECODE_ERROR;
2280                 goto f_err;
2281                 }
2282
2283 #ifndef OPENSSL_NO_RSA 
2284         if (pkey->type == EVP_PKEY_RSA)
2285                 {
2286                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2287                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i, 
2288                                                         pkey->pkey.rsa);
2289                 if (i < 0)
2290                         {
2291                         al=SSL_AD_DECRYPT_ERROR;
2292                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2293                         goto f_err;
2294                         }
2295                 if (i == 0)
2296                         {
2297                         al=SSL_AD_DECRYPT_ERROR;
2298                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2299                         goto f_err;
2300                         }
2301                 }
2302         else
2303 #endif
2304 #ifndef OPENSSL_NO_DSA
2305                 if (pkey->type == EVP_PKEY_DSA)
2306                 {
2307                 j=DSA_verify(pkey->save_type,
2308                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2309                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2310                 if (j <= 0)
2311                         {
2312                         /* bad signature */
2313                         al=SSL_AD_DECRYPT_ERROR;
2314                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2315                         goto f_err;
2316                         }
2317                 }
2318         else
2319 #endif
2320 #ifndef OPENSSL_NO_ECDSA
2321                 if (pkey->type == EVP_PKEY_EC)
2322                 {
2323                 j=ECDSA_verify(pkey->save_type,
2324                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2325                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2326                 if (j <= 0)
2327                         {
2328                         /* bad signature */
2329                         al=SSL_AD_DECRYPT_ERROR;
2330                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2331                             SSL_R_BAD_ECDSA_SIGNATURE);
2332                         goto f_err;
2333                         }
2334                 }
2335         else
2336 #endif
2337                 {
2338                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2339                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2340                 goto f_err;
2341                 }
2342
2343
2344         ret=1;
2345         if (0)
2346                 {
2347 f_err:
2348                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2349                 }
2350 end:
2351         EVP_PKEY_free(pkey);
2352         return(ret);
2353         }
2354
2355 int ssl3_get_client_certificate(SSL *s)
2356         {
2357         int i,ok,al,ret= -1;
2358         X509 *x=NULL;
2359         unsigned long l,nc,llen,n;
2360         const unsigned char *p,*q;
2361         unsigned char *d;
2362         STACK_OF(X509) *sk=NULL;
2363
2364         n=s->method->ssl_get_message(s,
2365                 SSL3_ST_SR_CERT_A,
2366                 SSL3_ST_SR_CERT_B,
2367                 -1,
2368                 s->max_cert_list,
2369                 &ok);
2370
2371         if (!ok) return((int)n);
2372
2373         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2374                 {
2375                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2376                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2377                         {
2378                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2379                         al=SSL_AD_HANDSHAKE_FAILURE;
2380                         goto f_err;
2381                         }
2382                 /* If tls asked for a client cert, the client must return a 0 list */
2383                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2384                         {
2385                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2386                         al=SSL_AD_UNEXPECTED_MESSAGE;
2387                         goto f_err;
2388                         }
2389                 s->s3->tmp.reuse_message=1;
2390                 return(1);
2391                 }
2392
2393         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2394                 {
2395                 al=SSL_AD_UNEXPECTED_MESSAGE;
2396                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2397                 goto f_err;
2398                 }
2399         p=d=(unsigned char *)s->init_msg;
2400
2401         if ((sk=sk_X509_new_null()) == NULL)
2402                 {
2403                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2404                 goto err;
2405                 }
2406
2407         n2l3(p,llen);
2408         if (llen+3 != n)
2409                 {
2410                 al=SSL_AD_DECODE_ERROR;
2411                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2412                 goto f_err;
2413                 }
2414         for (nc=0; nc<llen; )
2415                 {
2416                 n2l3(p,l);
2417                 if ((l+nc+3) > llen)
2418                         {
2419                         al=SSL_AD_DECODE_ERROR;
2420                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2421                         goto f_err;
2422                         }
2423
2424                 q=p;
2425                 x=d2i_X509(NULL,&p,l);
2426                 if (x == NULL)
2427                         {
2428                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2429                         goto err;
2430                         }
2431                 if (p != (q+l))
2432                         {
2433                         al=SSL_AD_DECODE_ERROR;
2434                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2435                         goto f_err;
2436                         }
2437                 if (!sk_X509_push(sk,x))
2438                         {
2439                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2440                         goto err;
2441                         }
2442                 x=NULL;
2443                 nc+=l+3;
2444                 }
2445
2446         if (sk_X509_num(sk) <= 0)
2447                 {
2448                 /* TLS does not mind 0 certs returned */
2449                 if (s->version == SSL3_VERSION)
2450                         {
2451                         al=SSL_AD_HANDSHAKE_FAILURE;
2452                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2453                         goto f_err;
2454                         }
2455                 /* Fail for TLS only if we required a certificate */
2456                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2457                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2458                         {
2459                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2460                         al=SSL_AD_HANDSHAKE_FAILURE;
2461                         goto f_err;
2462                         }
2463                 }
2464         else
2465                 {
2466                 i=ssl_verify_cert_chain(s,sk);
2467                 if (!i)
2468                         {
2469                         al=ssl_verify_alarm_type(s->verify_result);
2470                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2471                         goto f_err;
2472                         }
2473                 }
2474
2475         if (s->session->peer != NULL) /* This should not be needed */
2476                 X509_free(s->session->peer);
2477         s->session->peer=sk_X509_shift(sk);
2478         s->session->verify_result = s->verify_result;
2479
2480         /* With the current implementation, sess_cert will always be NULL
2481          * when we arrive here. */
2482         if (s->session->sess_cert == NULL)
2483                 {
2484                 s->session->sess_cert = ssl_sess_cert_new();
2485                 if (s->session->sess_cert == NULL)
2486                         {
2487                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2488                         goto err;
2489                         }
2490                 }
2491         if (s->session->sess_cert->cert_chain != NULL)
2492                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2493         s->session->sess_cert->cert_chain=sk;
2494         /* Inconsistency alert: cert_chain does *not* include the
2495          * peer's own certificate, while we do include it in s3_clnt.c */
2496
2497         sk=NULL;
2498
2499         ret=1;
2500         if (0)
2501                 {
2502 f_err:
2503                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2504                 }
2505 err:
2506         if (x != NULL) X509_free(x);
2507         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2508         return(ret);
2509         }
2510
2511 int ssl3_send_server_certificate(SSL *s)
2512         {
2513         unsigned long l;
2514         X509 *x;
2515
2516         if (s->state == SSL3_ST_SW_CERT_A)
2517                 {
2518                 x=ssl_get_server_send_cert(s);
2519                 if (x == NULL &&
2520                         /* VRS: allow null cert if auth == KRB5 */
2521                         (s->s3->tmp.new_cipher->algorithms
2522                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2523                         != (SSL_aKRB5|SSL_kKRB5))
2524                         {
2525                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2526                         return(0);
2527                         }
2528
2529                 l=ssl3_output_cert_chain(s,x);
2530                 s->state=SSL3_ST_SW_CERT_B;
2531                 s->init_num=(int)l;
2532                 s->init_off=0;
2533                 }
2534
2535         /* SSL3_ST_SW_CERT_B */
2536         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2537         }
2538
2539
2540 #ifndef OPENSSL_NO_ECDH
2541 /* This is the complement of curve_id2nid in s3_clnt.c. */
2542 static int nid2curve_id(int nid)
2543 {
2544         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2545          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2546         switch (nid) {
2547         case NID_sect163k1: /* sect163k1 (1) */
2548                 return 1;
2549         case NID_sect163r1: /* sect163r1 (2) */
2550                 return 2;
2551         case NID_sect163r2: /* sect163r2 (3) */
2552                 return 3;
2553         case NID_sect193r1: /* sect193r1 (4) */ 
2554                 return 4;
2555         case NID_sect193r2: /* sect193r2 (5) */ 
2556                 return 5;
2557         case NID_sect233k1: /* sect233k1 (6) */
2558                 return 6;
2559         case NID_sect233r1: /* sect233r1 (7) */ 
2560                 return 7;
2561         case NID_sect239k1: /* sect239k1 (8) */ 
2562                 return 8;
2563         case NID_sect283k1: /* sect283k1 (9) */
2564                 return 9;
2565         case NID_sect283r1: /* sect283r1 (10) */ 
2566                 return 10;
2567         case NID_sect409k1: /* sect409k1 (11) */ 
2568                 return 11;
2569         case NID_sect409r1: /* sect409r1 (12) */
2570                 return 12;
2571         case NID_sect571k1: /* sect571k1 (13) */ 
2572                 return 13;
2573         case NID_sect571r1: /* sect571r1 (14) */ 
2574                 return 14;
2575         case NID_secp160k1: /* secp160k1 (15) */
2576                 return 15;
2577         case NID_secp160r1: /* secp160r1 (16) */ 
2578                 return 16;
2579         case NID_secp160r2: /* secp160r2 (17) */ 
2580                 return 17;
2581         case NID_secp192k1: /* secp192k1 (18) */
2582                 return 18;
2583         case NID_X9_62_prime192v1: /* secp192r1 (19) */ 
2584                 return 19;
2585         case NID_secp224k1: /* secp224k1 (20) */ 
2586                 return 20;
2587         case NID_secp224r1: /* secp224r1 (21) */
2588                 return 21;
2589         case NID_secp256k1: /* secp256k1 (22) */ 
2590                 return 22;
2591         case NID_X9_62_prime256v1: /* secp256r1 (23) */ 
2592                 return 23;
2593         case NID_secp384r1: /* secp384r1 (24) */
2594                 return 24;
2595         case NID_secp521r1:  /* secp521r1 (25) */       
2596                 return 25;
2597         default:
2598                 return 0;
2599         }
2600 }
2601 #endif