211dd03b110bd0ae491403ec8f841f94d5be85d4
[openssl.git] / ssl / s3_clnt.c
1 /* ssl/s3_clnt.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) 1998-2003 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 #include <stdio.h>
126 #include "ssl_locl.h"
127 #include "kssl_lcl.h"
128 #include <openssl/buffer.h>
129 #include <openssl/rand.h>
130 #include <openssl/objects.h>
131 #include <openssl/evp.h>
132 #include <openssl/md5.h>
133 #include "cryptlib.h"
134
135 static SSL_METHOD *ssl3_get_client_method(int ver);
136 static int ssl3_client_hello(SSL *s);
137 static int ssl3_get_server_hello(SSL *s);
138 static int ssl3_get_certificate_request(SSL *s);
139 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
140 static int ssl3_get_server_done(SSL *s);
141 static int ssl3_send_client_verify(SSL *s);
142 static int ssl3_send_client_certificate(SSL *s);
143 static int ssl3_send_client_key_exchange(SSL *s);
144 static int ssl3_get_key_exchange(SSL *s);
145 static int ssl3_get_server_certificate(SSL *s);
146 static int ssl3_check_cert_and_algorithm(SSL *s);
147
148 #ifndef OPENSSL_NO_ECDH
149 static int curve_id2nid(int curve_id);
150 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
151 #endif
152
153 static SSL_METHOD *ssl3_get_client_method(int ver)
154         {
155         if (ver == SSL3_VERSION)
156                 return(SSLv3_client_method());
157         else
158                 return(NULL);
159         }
160
161 SSL_METHOD *SSLv3_client_method(void)
162         {
163         static int init=1;
164         static SSL_METHOD SSLv3_client_data;
165
166         if (init)
167                 {
168                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
169
170                 if (init)
171                         {
172                         memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
173                                 sizeof(SSL_METHOD));
174                         SSLv3_client_data.ssl_connect=ssl3_connect;
175                         SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
176                         init=0;
177                         }
178
179                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
180                 }
181         return(&SSLv3_client_data);
182         }
183
184 int ssl3_connect(SSL *s)
185         {
186         BUF_MEM *buf=NULL;
187         unsigned long Time=time(NULL),l;
188         long num1;
189         void (*cb)(const SSL *ssl,int type,int val)=NULL;
190         int ret= -1;
191         int new_state,state,skip=0;;
192
193         RAND_add(&Time,sizeof(Time),0);
194         ERR_clear_error();
195         clear_sys_error();
196
197         if (s->info_callback != NULL)
198                 cb=s->info_callback;
199         else if (s->ctx->info_callback != NULL)
200                 cb=s->ctx->info_callback;
201         
202         s->in_handshake++;
203         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
204
205         for (;;)
206                 {
207                 state=s->state;
208
209                 switch(s->state)
210                         {
211                 case SSL_ST_RENEGOTIATE:
212                         s->new_session=1;
213                         s->state=SSL_ST_CONNECT;
214                         s->ctx->stats.sess_connect_renegotiate++;
215                         /* break */
216                 case SSL_ST_BEFORE:
217                 case SSL_ST_CONNECT:
218                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
219                 case SSL_ST_OK|SSL_ST_CONNECT:
220
221                         s->server=0;
222                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
223
224                         if ((s->version & 0xff00 ) != 0x0300)
225                                 {
226                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
227                                 ret = -1;
228                                 goto end;
229                                 }
230                                 
231                         /* s->version=SSL3_VERSION; */
232                         s->type=SSL_ST_CONNECT;
233
234                         if (s->init_buf == NULL)
235                                 {
236                                 if ((buf=BUF_MEM_new()) == NULL)
237                                         {
238                                         ret= -1;
239                                         goto end;
240                                         }
241                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
242                                         {
243                                         ret= -1;
244                                         goto end;
245                                         }
246                                 s->init_buf=buf;
247                                 buf=NULL;
248                                 }
249
250                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
251
252                         /* setup buffing BIO */
253                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
254
255                         /* don't push the buffering BIO quite yet */
256
257                         ssl3_init_finished_mac(s);
258
259                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
260                         s->ctx->stats.sess_connect++;
261                         s->init_num=0;
262                         break;
263
264                 case SSL3_ST_CW_CLNT_HELLO_A:
265                 case SSL3_ST_CW_CLNT_HELLO_B:
266
267                         s->shutdown=0;
268                         ret=ssl3_client_hello(s);
269                         if (ret <= 0) goto end;
270                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
271                         s->init_num=0;
272
273                         /* turn on buffering for the next lot of output */
274                         if (s->bbio != s->wbio)
275                                 s->wbio=BIO_push(s->bbio,s->wbio);
276
277                         break;
278
279                 case SSL3_ST_CR_SRVR_HELLO_A:
280                 case SSL3_ST_CR_SRVR_HELLO_B:
281                         ret=ssl3_get_server_hello(s);
282                         if (ret <= 0) goto end;
283                         if (s->hit)
284                                 s->state=SSL3_ST_CR_FINISHED_A;
285                         else
286                                 s->state=SSL3_ST_CR_CERT_A;
287                         s->init_num=0;
288                         break;
289
290                 case SSL3_ST_CR_CERT_A:
291                 case SSL3_ST_CR_CERT_B:
292                         /* Check if it is anon DH/ECDH */
293                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
294                                 {
295                                 ret=ssl3_get_server_certificate(s);
296                                 if (ret <= 0) goto end;
297                                 }
298                         else
299                                 skip=1;
300                         s->state=SSL3_ST_CR_KEY_EXCH_A;
301                         s->init_num=0;
302                         break;
303
304                 case SSL3_ST_CR_KEY_EXCH_A:
305                 case SSL3_ST_CR_KEY_EXCH_B:
306                         ret=ssl3_get_key_exchange(s);
307                         if (ret <= 0) goto end;
308                         s->state=SSL3_ST_CR_CERT_REQ_A;
309                         s->init_num=0;
310
311                         /* at this point we check that we have the
312                          * required stuff from the server */
313                         if (!ssl3_check_cert_and_algorithm(s))
314                                 {
315                                 ret= -1;
316                                 goto end;
317                                 }
318                         break;
319
320                 case SSL3_ST_CR_CERT_REQ_A:
321                 case SSL3_ST_CR_CERT_REQ_B:
322                         ret=ssl3_get_certificate_request(s);
323                         if (ret <= 0) goto end;
324                         s->state=SSL3_ST_CR_SRVR_DONE_A;
325                         s->init_num=0;
326                         break;
327
328                 case SSL3_ST_CR_SRVR_DONE_A:
329                 case SSL3_ST_CR_SRVR_DONE_B:
330                         ret=ssl3_get_server_done(s);
331                         if (ret <= 0) goto end;
332                         if (s->s3->tmp.cert_req)
333                                 s->state=SSL3_ST_CW_CERT_A;
334                         else
335                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
336                         s->init_num=0;
337
338                         break;
339
340                 case SSL3_ST_CW_CERT_A:
341                 case SSL3_ST_CW_CERT_B:
342                 case SSL3_ST_CW_CERT_C:
343                 case SSL3_ST_CW_CERT_D:
344                         ret=ssl3_send_client_certificate(s);
345                         if (ret <= 0) goto end;
346                         s->state=SSL3_ST_CW_KEY_EXCH_A;
347                         s->init_num=0;
348                         break;
349
350                 case SSL3_ST_CW_KEY_EXCH_A:
351                 case SSL3_ST_CW_KEY_EXCH_B:
352                         ret=ssl3_send_client_key_exchange(s);
353                         if (ret <= 0) goto end;
354                         l=s->s3->tmp.new_cipher->algorithms;
355                         /* EAY EAY EAY need to check for DH fix cert
356                          * sent back */
357                         /* For TLS, cert_req is set to 2, so a cert chain
358                          * of nothing is sent, but no verify packet is sent */
359                         /* XXX: For now, we do not support client 
360                          * authentication in ECDH cipher suites with
361                          * ECDH (rather than ECDSA) certificates.
362                          * We need to skip the certificate verify 
363                          * message when client's ECDH public key is sent 
364                          * inside the client certificate.
365                          */
366                         if (s->s3->tmp.cert_req == 1)
367                                 {
368                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
369                                 }
370                         else
371                                 {
372                                 s->state=SSL3_ST_CW_CHANGE_A;
373                                 s->s3->change_cipher_spec=0;
374                                 }
375
376                         s->init_num=0;
377                         break;
378
379                 case SSL3_ST_CW_CERT_VRFY_A:
380                 case SSL3_ST_CW_CERT_VRFY_B:
381                         ret=ssl3_send_client_verify(s);
382                         if (ret <= 0) goto end;
383                         s->state=SSL3_ST_CW_CHANGE_A;
384                         s->init_num=0;
385                         s->s3->change_cipher_spec=0;
386                         break;
387
388                 case SSL3_ST_CW_CHANGE_A:
389                 case SSL3_ST_CW_CHANGE_B:
390                         ret=ssl3_send_change_cipher_spec(s,
391                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
392                         if (ret <= 0) goto end;
393                         s->state=SSL3_ST_CW_FINISHED_A;
394                         s->init_num=0;
395
396                         s->session->cipher=s->s3->tmp.new_cipher;
397                         if (s->s3->tmp.new_compression == NULL)
398                                 s->session->compress_meth=0;
399                         else
400                                 s->session->compress_meth=
401                                         s->s3->tmp.new_compression->id;
402                         if (!s->method->ssl3_enc->setup_key_block(s))
403                                 {
404                                 ret= -1;
405                                 goto end;
406                                 }
407
408                         if (!s->method->ssl3_enc->change_cipher_state(s,
409                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
410                                 {
411                                 ret= -1;
412                                 goto end;
413                                 }
414
415                         break;
416
417                 case SSL3_ST_CW_FINISHED_A:
418                 case SSL3_ST_CW_FINISHED_B:
419                         ret=ssl3_send_finished(s,
420                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
421                                 s->method->ssl3_enc->client_finished_label,
422                                 s->method->ssl3_enc->client_finished_label_len);
423                         if (ret <= 0) goto end;
424                         s->state=SSL3_ST_CW_FLUSH;
425
426                         /* clear flags */
427                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
428                         if (s->hit)
429                                 {
430                                 s->s3->tmp.next_state=SSL_ST_OK;
431                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
432                                         {
433                                         s->state=SSL_ST_OK;
434                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
435                                         s->s3->delay_buf_pop_ret=0;
436                                         }
437                                 }
438                         else
439                                 {
440                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
441                                 }
442                         s->init_num=0;
443                         break;
444
445                 case SSL3_ST_CR_FINISHED_A:
446                 case SSL3_ST_CR_FINISHED_B:
447
448                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
449                                 SSL3_ST_CR_FINISHED_B);
450                         if (ret <= 0) goto end;
451
452                         if (s->hit)
453                                 s->state=SSL3_ST_CW_CHANGE_A;
454                         else
455                                 s->state=SSL_ST_OK;
456                         s->init_num=0;
457                         break;
458
459                 case SSL3_ST_CW_FLUSH:
460                         /* number of bytes to be flushed */
461                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
462                         if (num1 > 0)
463                                 {
464                                 s->rwstate=SSL_WRITING;
465                                 num1=BIO_flush(s->wbio);
466                                 if (num1 <= 0) { ret= -1; goto end; }
467                                 s->rwstate=SSL_NOTHING;
468                                 }
469
470                         s->state=s->s3->tmp.next_state;
471                         break;
472
473                 case SSL_ST_OK:
474                         /* clean a few things up */
475                         ssl3_cleanup_key_block(s);
476
477                         if (s->init_buf != NULL)
478                                 {
479                                 BUF_MEM_free(s->init_buf);
480                                 s->init_buf=NULL;
481                                 }
482
483                         /* If we are not 'joining' the last two packets,
484                          * remove the buffering now */
485                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
486                                 ssl_free_wbio_buffer(s);
487                         /* else do it later in ssl3_write */
488
489                         s->init_num=0;
490                         s->new_session=0;
491
492                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
493                         if (s->hit) s->ctx->stats.sess_hit++;
494
495                         ret=1;
496                         /* s->server=0; */
497                         s->handshake_func=ssl3_connect;
498                         s->ctx->stats.sess_connect_good++;
499
500                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
501
502                         goto end;
503                         /* break; */
504                         
505                 default:
506                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
507                         ret= -1;
508                         goto end;
509                         /* break; */
510                         }
511
512                 /* did we do anything */
513                 if (!s->s3->tmp.reuse_message && !skip)
514                         {
515                         if (s->debug)
516                                 {
517                                 if ((ret=BIO_flush(s->wbio)) <= 0)
518                                         goto end;
519                                 }
520
521                         if ((cb != NULL) && (s->state != state))
522                                 {
523                                 new_state=s->state;
524                                 s->state=state;
525                                 cb(s,SSL_CB_CONNECT_LOOP,1);
526                                 s->state=new_state;
527                                 }
528                         }
529                 skip=0;
530                 }
531 end:
532         s->in_handshake--;
533         if (buf != NULL)
534                 BUF_MEM_free(buf);
535         if (cb != NULL)
536                 cb(s,SSL_CB_CONNECT_EXIT,ret);
537         return(ret);
538         }
539
540
541 static int ssl3_client_hello(SSL *s)
542         {
543         unsigned char *buf;
544         unsigned char *p,*d;
545         int i,j;
546         unsigned long Time,l;
547         SSL_COMP *comp;
548
549         buf=(unsigned char *)s->init_buf->data;
550         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
551                 {
552                 if ((s->session == NULL) ||
553                         (s->session->ssl_version != s->version) ||
554                         (s->session->not_resumable))
555                         {
556                         if (!ssl_get_new_session(s,0))
557                                 goto err;
558                         }
559                 /* else use the pre-loaded session */
560
561                 p=s->s3->client_random;
562                 Time=time(NULL);                        /* Time */
563                 l2n(Time,p);
564                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
565
566                 /* Do the message type and length last */
567                 d=p= &(buf[4]);
568
569                 *(p++)=s->version>>8;
570                 *(p++)=s->version&0xff;
571                 s->client_version=s->version;
572
573                 /* Random stuff */
574                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
575                 p+=SSL3_RANDOM_SIZE;
576
577                 /* Session ID */
578                 if (s->new_session)
579                         i=0;
580                 else
581                         i=s->session->session_id_length;
582                 *(p++)=i;
583                 if (i != 0)
584                         {
585                         if (i > sizeof s->session->session_id)
586                                 {
587                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
588                                 goto err;
589                                 }
590                         memcpy(p,s->session->session_id,i);
591                         p+=i;
592                         }
593                 
594                 /* Ciphers supported */
595                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
596                 if (i == 0)
597                         {
598                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
599                         goto err;
600                         }
601                 s2n(i,p);
602                 p+=i;
603
604                 /* COMPRESSION */
605                 if (s->ctx->comp_methods == NULL)
606                         j=0;
607                 else
608                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
609                 *(p++)=1+j;
610                 for (i=0; i<j; i++)
611                         {
612                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
613                         *(p++)=comp->id;
614                         }
615                 *(p++)=0; /* Add the NULL method */
616                 
617                 l=(p-d);
618                 d=buf;
619                 *(d++)=SSL3_MT_CLIENT_HELLO;
620                 l2n3(l,d);
621
622                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
623                 /* number of bytes to write */
624                 s->init_num=p-buf;
625                 s->init_off=0;
626                 }
627
628         /* SSL3_ST_CW_CLNT_HELLO_B */
629         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
630 err:
631         return(-1);
632         }
633
634 static int ssl3_get_server_hello(SSL *s)
635         {
636         STACK_OF(SSL_CIPHER) *sk;
637         SSL_CIPHER *c;
638         unsigned char *p,*d;
639         int i,al,ok;
640         unsigned int j;
641         long n;
642         SSL_COMP *comp;
643
644         n=ssl3_get_message(s,
645                 SSL3_ST_CR_SRVR_HELLO_A,
646                 SSL3_ST_CR_SRVR_HELLO_B,
647                 SSL3_MT_SERVER_HELLO,
648                 300, /* ?? */
649                 &ok);
650
651         if (!ok) return((int)n);
652         d=p=(unsigned char *)s->init_msg;
653
654         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
655                 {
656                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
657                 s->version=(s->version&0xff00)|p[1];
658                 al=SSL_AD_PROTOCOL_VERSION;
659                 goto f_err;
660                 }
661         p+=2;
662
663         /* load the server hello data */
664         /* load the server random */
665         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
666         p+=SSL3_RANDOM_SIZE;
667
668         /* get the session-id */
669         j= *(p++);
670
671         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
672                 {
673                 al=SSL_AD_ILLEGAL_PARAMETER;
674                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
675                 goto f_err;
676                 }
677
678         if (j != 0 && j == s->session->session_id_length
679             && memcmp(p,s->session->session_id,j) == 0)
680             {
681             if(s->sid_ctx_length != s->session->sid_ctx_length
682                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
683                 {
684                 /* actually a client application bug */
685                 al=SSL_AD_ILLEGAL_PARAMETER;
686                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
687                 goto f_err;
688                 }
689             s->hit=1;
690             }
691         else    /* a miss or crap from the other end */
692                 {
693                 /* If we were trying for session-id reuse, make a new
694                  * SSL_SESSION so we don't stuff up other people */
695                 s->hit=0;
696                 if (s->session->session_id_length > 0)
697                         {
698                         if (!ssl_get_new_session(s,0))
699                                 {
700                                 al=SSL_AD_INTERNAL_ERROR;
701                                 goto f_err;
702                                 }
703                         }
704                 s->session->session_id_length=j;
705                 memcpy(s->session->session_id,p,j); /* j could be 0 */
706                 }
707         p+=j;
708         c=ssl_get_cipher_by_char(s,p);
709         if (c == NULL)
710                 {
711                 /* unknown cipher */
712                 al=SSL_AD_ILLEGAL_PARAMETER;
713                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
714                 goto f_err;
715                 }
716         p+=ssl_put_cipher_by_char(s,NULL,NULL);
717
718         sk=ssl_get_ciphers_by_id(s);
719         i=sk_SSL_CIPHER_find(sk,c);
720         if (i < 0)
721                 {
722                 /* we did not say we would use this cipher */
723                 al=SSL_AD_ILLEGAL_PARAMETER;
724                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
725                 goto f_err;
726                 }
727
728         /* Depending on the session caching (internal/external), the cipher
729            and/or cipher_id values may not be set. Make sure that
730            cipher_id is set and use it for comparison. */
731         if (s->session->cipher)
732                 s->session->cipher_id = s->session->cipher->id;
733         if (s->hit && (s->session->cipher_id != c->id))
734                 {
735                 if (!(s->options &
736                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
737                         {
738                         al=SSL_AD_ILLEGAL_PARAMETER;
739                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
740                         goto f_err;
741                         }
742                 }
743         s->s3->tmp.new_cipher=c;
744
745         /* lets get the compression algorithm */
746         /* COMPRESSION */
747         j= *(p++);
748         if (j == 0)
749                 comp=NULL;
750         else
751                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
752         
753         if ((j != 0) && (comp == NULL))
754                 {
755                 al=SSL_AD_ILLEGAL_PARAMETER;
756                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
757                 goto f_err;
758                 }
759         else
760                 {
761                 s->s3->tmp.new_compression=comp;
762                 }
763
764         if (p != (d+n))
765                 {
766                 /* wrong packet length */
767                 al=SSL_AD_DECODE_ERROR;
768                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
769                 goto err;
770                 }
771
772         return(1);
773 f_err:
774         ssl3_send_alert(s,SSL3_AL_FATAL,al);
775 err:
776         return(-1);
777         }
778
779 static int ssl3_get_server_certificate(SSL *s)
780         {
781         int al,i,ok,ret= -1;
782         unsigned long n,nc,llen,l;
783         X509 *x=NULL;
784         unsigned char *p,*d,*q;
785         STACK_OF(X509) *sk=NULL;
786         SESS_CERT *sc;
787         EVP_PKEY *pkey=NULL;
788         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
789
790         n=ssl3_get_message(s,
791                 SSL3_ST_CR_CERT_A,
792                 SSL3_ST_CR_CERT_B,
793                 -1,
794                 s->max_cert_list,
795                 &ok);
796
797         if (!ok) return((int)n);
798
799         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
800                 {
801                 s->s3->tmp.reuse_message=1;
802                 return(1);
803                 }
804
805         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
806                 {
807                 al=SSL_AD_UNEXPECTED_MESSAGE;
808                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
809                 goto f_err;
810                 }
811         d=p=(unsigned char *)s->init_msg;
812
813         if ((sk=sk_X509_new_null()) == NULL)
814                 {
815                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
816                 goto err;
817                 }
818
819         n2l3(p,llen);
820         if (llen+3 != n)
821                 {
822                 al=SSL_AD_DECODE_ERROR;
823                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
824                 goto f_err;
825                 }
826         for (nc=0; nc<llen; )
827                 {
828                 n2l3(p,l);
829                 if ((l+nc+3) > llen)
830                         {
831                         al=SSL_AD_DECODE_ERROR;
832                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
833                         goto f_err;
834                         }
835
836                 q=p;
837                 x=d2i_X509(NULL,&q,l);
838                 if (x == NULL)
839                         {
840                         al=SSL_AD_BAD_CERTIFICATE;
841                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
842                         goto f_err;
843                         }
844                 if (q != (p+l))
845                         {
846                         al=SSL_AD_DECODE_ERROR;
847                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
848                         goto f_err;
849                         }
850                 if (!sk_X509_push(sk,x))
851                         {
852                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
853                         goto err;
854                         }
855                 x=NULL;
856                 nc+=l+3;
857                 p=q;
858                 }
859
860         i=ssl_verify_cert_chain(s,sk);
861         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
862 #ifndef OPENSSL_NO_KRB5
863                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
864                 != (SSL_aKRB5|SSL_kKRB5)
865 #endif /* OPENSSL_NO_KRB5 */
866                 )
867                 {
868                 al=ssl_verify_alarm_type(s->verify_result);
869                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
870                 goto f_err; 
871                 }
872         ERR_clear_error(); /* but we keep s->verify_result */
873
874         sc=ssl_sess_cert_new();
875         if (sc == NULL) goto err;
876
877         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
878         s->session->sess_cert=sc;
879
880         sc->cert_chain=sk;
881         /* Inconsistency alert: cert_chain does include the peer's
882          * certificate, which we don't include in s3_srvr.c */
883         x=sk_X509_value(sk,0);
884         sk=NULL;
885         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
886
887         pkey=X509_get_pubkey(x);
888
889         /* VRS: allow null cert if auth == KRB5 */
890         need_cert =     ((s->s3->tmp.new_cipher->algorithms
891                          & (SSL_MKEY_MASK|SSL_AUTH_MASK))
892                          == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
893
894 #ifdef KSSL_DEBUG
895         printf("pkey,x = %p, %p\n", pkey,x);
896         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
897         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
898                 s->s3->tmp.new_cipher->algorithms, need_cert);
899 #endif    /* KSSL_DEBUG */
900
901         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
902                 {
903                 x=NULL;
904                 al=SSL3_AL_FATAL;
905                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
906                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
907                 goto f_err;
908                 }
909
910         i=ssl_cert_type(x,pkey);
911         if (need_cert && i < 0)
912                 {
913                 x=NULL;
914                 al=SSL3_AL_FATAL;
915                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
916                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
917                 goto f_err;
918                 }
919
920         if (need_cert)
921                 {
922                 sc->peer_cert_type=i;
923                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
924                 /* Why would the following ever happen?
925                  * We just created sc a couple of lines ago. */
926                 if (sc->peer_pkeys[i].x509 != NULL)
927                         X509_free(sc->peer_pkeys[i].x509);
928                 sc->peer_pkeys[i].x509=x;
929                 sc->peer_key= &(sc->peer_pkeys[i]);
930
931                 if (s->session->peer != NULL)
932                         X509_free(s->session->peer);
933                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
934                 s->session->peer=x;
935                 }
936         else
937                 {
938                 sc->peer_cert_type=i;
939                 sc->peer_key= NULL;
940
941                 if (s->session->peer != NULL)
942                         X509_free(s->session->peer);
943                 s->session->peer=NULL;
944                 }
945         s->session->verify_result = s->verify_result;
946
947         x=NULL;
948         ret=1;
949
950         if (0)
951                 {
952 f_err:
953                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
954                 }
955 err:
956         EVP_PKEY_free(pkey);
957         X509_free(x);
958         sk_X509_pop_free(sk,X509_free);
959         return(ret);
960         }
961
962 static int ssl3_get_key_exchange(SSL *s)
963         {
964 #ifndef OPENSSL_NO_RSA
965         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
966 #endif
967         EVP_MD_CTX md_ctx;
968         unsigned char *param,*p;
969         int al,i,j,param_len,ok;
970         long n,alg;
971         EVP_PKEY *pkey=NULL;
972 #ifndef OPENSSL_NO_RSA
973         RSA *rsa=NULL;
974 #endif
975 #ifndef OPENSSL_NO_DH
976         DH *dh=NULL;
977 #endif
978 #ifndef OPENSSL_NO_ECDH
979         EC_KEY *ecdh = NULL;
980         BN_CTX *bn_ctx = NULL;
981         EC_POINT *srvr_ecpoint = NULL;
982         int curve_nid = 0;
983         int encoded_pt_len = 0;
984 #endif
985
986         /* use same message size as in ssl3_get_certificate_request()
987          * as ServerKeyExchange message may be skipped */
988         n=ssl3_get_message(s,
989                 SSL3_ST_CR_KEY_EXCH_A,
990                 SSL3_ST_CR_KEY_EXCH_B,
991                 -1,
992                 s->max_cert_list,
993                 &ok);
994
995         if (!ok) return((int)n);
996
997         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
998                 {
999                 s->s3->tmp.reuse_message=1;
1000                 return(1);
1001                 }
1002
1003         param=p=(unsigned char *)s->init_msg;
1004
1005         if (s->session->sess_cert != NULL)
1006                 {
1007 #ifndef OPENSSL_NO_RSA
1008                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1009                         {
1010                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1011                         s->session->sess_cert->peer_rsa_tmp=NULL;
1012                         }
1013 #endif
1014 #ifndef OPENSSL_NO_DH
1015                 if (s->session->sess_cert->peer_dh_tmp)
1016                         {
1017                         DH_free(s->session->sess_cert->peer_dh_tmp);
1018                         s->session->sess_cert->peer_dh_tmp=NULL;
1019                         }
1020 #endif
1021 #ifndef OPENSSL_NO_ECDH
1022                 if (s->session->sess_cert->peer_ecdh_tmp)
1023                         {
1024                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1025                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1026                         }
1027 #endif
1028                 }
1029         else
1030                 {
1031                 s->session->sess_cert=ssl_sess_cert_new();
1032                 }
1033
1034         param_len=0;
1035         alg=s->s3->tmp.new_cipher->algorithms;
1036         EVP_MD_CTX_init(&md_ctx);
1037
1038 #ifndef OPENSSL_NO_RSA
1039         if (alg & SSL_kRSA)
1040                 {
1041                 if ((rsa=RSA_new()) == NULL)
1042                         {
1043                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1044                         goto err;
1045                         }
1046                 n2s(p,i);
1047                 param_len=i+2;
1048                 if (param_len > n)
1049                         {
1050                         al=SSL_AD_DECODE_ERROR;
1051                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1052                         goto f_err;
1053                         }
1054                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1055                         {
1056                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1057                         goto err;
1058                         }
1059                 p+=i;
1060
1061                 n2s(p,i);
1062                 param_len+=i+2;
1063                 if (param_len > n)
1064                         {
1065                         al=SSL_AD_DECODE_ERROR;
1066                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1067                         goto f_err;
1068                         }
1069                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1070                         {
1071                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1072                         goto err;
1073                         }
1074                 p+=i;
1075                 n-=param_len;
1076
1077                 /* this should be because we are using an export cipher */
1078                 if (alg & SSL_aRSA)
1079                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1080                 else
1081                         {
1082                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1083                         goto err;
1084                         }
1085                 s->session->sess_cert->peer_rsa_tmp=rsa;
1086                 rsa=NULL;
1087                 }
1088 #else /* OPENSSL_NO_RSA */
1089         if (0)
1090                 ;
1091 #endif
1092 #ifndef OPENSSL_NO_DH
1093         else if (alg & SSL_kEDH)
1094                 {
1095                 if ((dh=DH_new()) == NULL)
1096                         {
1097                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1098                         goto err;
1099                         }
1100                 n2s(p,i);
1101                 param_len=i+2;
1102                 if (param_len > n)
1103                         {
1104                         al=SSL_AD_DECODE_ERROR;
1105                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1106                         goto f_err;
1107                         }
1108                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1109                         {
1110                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1111                         goto err;
1112                         }
1113                 p+=i;
1114
1115                 n2s(p,i);
1116                 param_len+=i+2;
1117                 if (param_len > n)
1118                         {
1119                         al=SSL_AD_DECODE_ERROR;
1120                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1121                         goto f_err;
1122                         }
1123                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1124                         {
1125                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1126                         goto err;
1127                         }
1128                 p+=i;
1129
1130                 n2s(p,i);
1131                 param_len+=i+2;
1132                 if (param_len > n)
1133                         {
1134                         al=SSL_AD_DECODE_ERROR;
1135                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1136                         goto f_err;
1137                         }
1138                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1139                         {
1140                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1141                         goto err;
1142                         }
1143                 p+=i;
1144                 n-=param_len;
1145
1146 #ifndef OPENSSL_NO_RSA
1147                 if (alg & SSL_aRSA)
1148                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1149 #else
1150                 if (0)
1151                         ;
1152 #endif
1153 #ifndef OPENSSL_NO_DSA
1154                 else if (alg & SSL_aDSS)
1155                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1156 #endif
1157                 /* else anonymous DH, so no certificate or pkey. */
1158
1159                 s->session->sess_cert->peer_dh_tmp=dh;
1160                 dh=NULL;
1161                 }
1162         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1163                 {
1164                 al=SSL_AD_ILLEGAL_PARAMETER;
1165                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1166                 goto f_err;
1167                 }
1168 #endif /* !OPENSSL_NO_DH */
1169
1170 #ifndef OPENSSL_NO_ECDH
1171         else if (alg & SSL_kECDHE)
1172                 {
1173                 if ((ecdh=EC_KEY_new()) == NULL)
1174                         {
1175                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1176                         goto err;
1177                         }
1178
1179                 /* Extract elliptic curve parameters and the
1180                  * server's ephemeral ECDH public key.
1181                  * Keep accumulating lengths of various components in
1182                  * param_len and make sure it never exceeds n.
1183                  */
1184
1185                 /* XXX: For now we only support named (not generic) curves
1186                  * and the ECParameters in this case is just two bytes.
1187                  */
1188                 param_len=2;
1189                 if ((param_len > n) ||
1190                     (*p != NAMED_CURVE_TYPE) || 
1191                     ((curve_nid = curve_id2nid(*(p + 1))) == 0)) 
1192                         {
1193                         al=SSL_AD_INTERNAL_ERROR;
1194                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1195                         goto f_err;
1196                         }
1197
1198                 if (!(ecdh->group=EC_GROUP_new_by_nid(curve_nid)))
1199                         {
1200                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1201                         goto err;
1202                         }
1203
1204                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1205                     (EC_GROUP_get_degree(ecdh->group) > 163))
1206                         {
1207                         al=SSL_AD_EXPORT_RESTRICTION;
1208                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1209                         goto f_err;
1210                         }
1211
1212                 p+=2;
1213
1214                 /* Next, get the encoded ECPoint */
1215                 if (((srvr_ecpoint = EC_POINT_new(ecdh->group)) == NULL) ||
1216                     ((bn_ctx = BN_CTX_new()) == NULL))
1217                         {
1218                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1219                         goto err;
1220                         }
1221
1222                 encoded_pt_len = *p;  /* length of encoded point */
1223                 p+=1;
1224                 param_len += (1 + encoded_pt_len);
1225                 if ((param_len > n) ||
1226                     (EC_POINT_oct2point(ecdh->group, srvr_ecpoint, 
1227                         p, encoded_pt_len, bn_ctx) == 0))
1228                         {
1229                         al=SSL_AD_DECODE_ERROR;
1230                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1231                         goto f_err;
1232                         }
1233
1234                 n-=param_len;
1235                 p+=encoded_pt_len;
1236
1237                 /* The ECC/TLS specification does not mention
1238                  * the use of DSA to sign ECParameters in the server
1239                  * key exchange message. We do support RSA and ECDSA.
1240                  */
1241                 if (0) ;
1242 #ifndef OPENSSL_NO_RSA
1243                 else if (alg & SSL_aRSA)
1244                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1245 #endif
1246 #ifndef OPENSSL_NO_ECDSA
1247                 else if (alg & SSL_aECDSA)
1248                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1249 #endif
1250                 /* else anonymous ECDH, so no certificate or pkey. */
1251                 ecdh->pub_key = srvr_ecpoint;
1252                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1253                 ecdh=NULL;
1254                 BN_CTX_free(bn_ctx);
1255                 srvr_ecpoint = NULL;
1256                 }
1257         else if (alg & SSL_kECDH)
1258                 {
1259                 al=SSL_AD_UNEXPECTED_MESSAGE;
1260                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1261                 goto f_err;
1262                 }
1263 #endif /* !OPENSSL_NO_ECDH */
1264         if (alg & SSL_aFZA)
1265                 {
1266                 al=SSL_AD_HANDSHAKE_FAILURE;
1267                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1268                 goto f_err;
1269                 }
1270
1271
1272         /* p points to the next byte, there are 'n' bytes left */
1273
1274         /* if it was signed, check the signature */
1275         if (pkey != NULL)
1276                 {
1277                 n2s(p,i);
1278                 n-=2;
1279                 j=EVP_PKEY_size(pkey);
1280
1281                 if ((i != n) || (n > j) || (n <= 0))
1282                         {
1283                         /* wrong packet length */
1284                         al=SSL_AD_DECODE_ERROR;
1285                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1286                         goto f_err;
1287                         }
1288
1289 #ifndef OPENSSL_NO_RSA
1290                 if (pkey->type == EVP_PKEY_RSA)
1291                         {
1292                         int num;
1293
1294                         j=0;
1295                         q=md_buf;
1296                         for (num=2; num > 0; num--)
1297                                 {
1298                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1299                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1300                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1301                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1302                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1303                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1304                                 q+=i;
1305                                 j+=i;
1306                                 }
1307                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1308                                                                 pkey->pkey.rsa);
1309                         if (i < 0)
1310                                 {
1311                                 al=SSL_AD_DECRYPT_ERROR;
1312                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1313                                 goto f_err;
1314                                 }
1315                         if (i == 0)
1316                                 {
1317                                 /* bad signature */
1318                                 al=SSL_AD_DECRYPT_ERROR;
1319                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1320                                 goto f_err;
1321                                 }
1322                         }
1323                 else
1324 #endif
1325 #ifndef OPENSSL_NO_DSA
1326                         if (pkey->type == EVP_PKEY_DSA)
1327                         {
1328                         /* lets do DSS */
1329                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1330                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1331                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1332                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1333                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1334                                 {
1335                                 /* bad signature */
1336                                 al=SSL_AD_DECRYPT_ERROR;
1337                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1338                                 goto f_err;
1339                                 }
1340                         }
1341                 else
1342 #endif
1343 #ifndef OPENSSL_NO_ECDSA
1344                         if (pkey->type == EVP_PKEY_EC)
1345                         {
1346                         /* let's do ECDSA */
1347                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1348                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1349                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1350                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1351                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1352                                 {
1353                                 /* bad signature */
1354                                 al=SSL_AD_DECRYPT_ERROR;
1355                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1356                                 goto f_err;
1357                                 }
1358                         }
1359                 else
1360 #endif
1361                         {
1362                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1363                         goto err;
1364                         }
1365                 }
1366         else
1367                 {
1368                 /* still data left over */
1369                 if (!(alg & SSL_aNULL))
1370                         {
1371                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1372                         goto err;
1373                         }
1374                 if (n != 0)
1375                         {
1376                         al=SSL_AD_DECODE_ERROR;
1377                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1378                         goto f_err;
1379                         }
1380                 }
1381         EVP_PKEY_free(pkey);
1382         EVP_MD_CTX_cleanup(&md_ctx);
1383         return(1);
1384 f_err:
1385         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1386 err:
1387         EVP_PKEY_free(pkey);
1388 #ifndef OPENSSL_NO_RSA
1389         if (rsa != NULL)
1390                 RSA_free(rsa);
1391 #endif
1392 #ifndef OPENSSL_NO_DH
1393         if (dh != NULL)
1394                 DH_free(dh);
1395 #endif
1396 #ifndef OPENSSL_NO_ECDH
1397         BN_CTX_free(bn_ctx);
1398         EC_POINT_free(srvr_ecpoint);
1399         if (ecdh != NULL)
1400                 EC_KEY_free(ecdh);
1401 #endif
1402         EVP_MD_CTX_cleanup(&md_ctx);
1403         return(-1);
1404         }
1405
1406 static int ssl3_get_certificate_request(SSL *s)
1407         {
1408         int ok,ret=0;
1409         unsigned long n,nc,l;
1410         unsigned int llen,ctype_num,i;
1411         X509_NAME *xn=NULL;
1412         unsigned char *p,*d,*q;
1413         STACK_OF(X509_NAME) *ca_sk=NULL;
1414
1415         n=ssl3_get_message(s,
1416                 SSL3_ST_CR_CERT_REQ_A,
1417                 SSL3_ST_CR_CERT_REQ_B,
1418                 -1,
1419                 s->max_cert_list,
1420                 &ok);
1421
1422         if (!ok) return((int)n);
1423
1424         s->s3->tmp.cert_req=0;
1425
1426         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1427                 {
1428                 s->s3->tmp.reuse_message=1;
1429                 return(1);
1430                 }
1431
1432         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1433                 {
1434                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1435                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1436                 goto err;
1437                 }
1438
1439         /* TLS does not like anon-DH with client cert */
1440         if (s->version > SSL3_VERSION)
1441                 {
1442                 l=s->s3->tmp.new_cipher->algorithms;
1443                 if (l & SSL_aNULL)
1444                         {
1445                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1446                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1447                         goto err;
1448                         }
1449                 }
1450
1451         d=p=(unsigned char *)s->init_msg;
1452
1453         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1454                 {
1455                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1456                 goto err;
1457                 }
1458
1459         /* get the certificate types */
1460         ctype_num= *(p++);
1461         if (ctype_num > SSL3_CT_NUMBER)
1462                 ctype_num=SSL3_CT_NUMBER;
1463         for (i=0; i<ctype_num; i++)
1464                 s->s3->tmp.ctype[i]= p[i];
1465         p+=ctype_num;
1466
1467         /* get the CA RDNs */
1468         n2s(p,llen);
1469 #if 0
1470 {
1471 FILE *out;
1472 out=fopen("/tmp/vsign.der","w");
1473 fwrite(p,1,llen,out);
1474 fclose(out);
1475 }
1476 #endif
1477
1478         if ((llen+ctype_num+2+1) != n)
1479                 {
1480                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1481                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1482                 goto err;
1483                 }
1484
1485         for (nc=0; nc<llen; )
1486                 {
1487                 n2s(p,l);
1488                 if ((l+nc+2) > llen)
1489                         {
1490                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1491                                 goto cont; /* netscape bugs */
1492                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1493                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1494                         goto err;
1495                         }
1496
1497                 q=p;
1498
1499                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1500                         {
1501                         /* If netscape tolerance is on, ignore errors */
1502                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1503                                 goto cont;
1504                         else
1505                                 {
1506                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1507                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1508                                 goto err;
1509                                 }
1510                         }
1511
1512                 if (q != (p+l))
1513                         {
1514                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1515                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1516                         goto err;
1517                         }
1518                 if (!sk_X509_NAME_push(ca_sk,xn))
1519                         {
1520                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1521                         goto err;
1522                         }
1523
1524                 p+=l;
1525                 nc+=l+2;
1526                 }
1527
1528         if (0)
1529                 {
1530 cont:
1531                 ERR_clear_error();
1532                 }
1533
1534         /* we should setup a certificate to return.... */
1535         s->s3->tmp.cert_req=1;
1536         s->s3->tmp.ctype_num=ctype_num;
1537         if (s->s3->tmp.ca_names != NULL)
1538                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1539         s->s3->tmp.ca_names=ca_sk;
1540         ca_sk=NULL;
1541
1542         ret=1;
1543 err:
1544         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1545         return(ret);
1546         }
1547
1548 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1549         {
1550         return(X509_NAME_cmp(*a,*b));
1551         }
1552
1553 static int ssl3_get_server_done(SSL *s)
1554         {
1555         int ok,ret=0;
1556         long n;
1557
1558         n=ssl3_get_message(s,
1559                 SSL3_ST_CR_SRVR_DONE_A,
1560                 SSL3_ST_CR_SRVR_DONE_B,
1561                 SSL3_MT_SERVER_DONE,
1562                 30, /* should be very small, like 0 :-) */
1563                 &ok);
1564
1565         if (!ok) return((int)n);
1566         if (n > 0)
1567                 {
1568                 /* should contain no data */
1569                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1570                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1571                 return -1;
1572                 }
1573         ret=1;
1574         return(ret);
1575         }
1576
1577
1578 static const int KDF1_SHA1_len = 20;
1579 static void *KDF1_SHA1(void *in, size_t inlen, void *out, size_t outlen)
1580         {
1581 #ifndef OPENSSL_NO_SHA
1582         if (outlen != SHA_DIGEST_LENGTH)
1583                 return NULL;
1584         return SHA1(in, inlen, out);
1585 #else
1586         return NULL;
1587 #endif
1588         }
1589
1590 static int ssl3_send_client_key_exchange(SSL *s)
1591         {
1592         unsigned char *p,*d;
1593         int n;
1594         unsigned long l;
1595 #ifndef OPENSSL_NO_RSA
1596         unsigned char *q;
1597         EVP_PKEY *pkey=NULL;
1598 #endif
1599 #ifndef OPENSSL_NO_KRB5
1600         KSSL_ERR kssl_err;
1601 #endif /* OPENSSL_NO_KRB5 */
1602 #ifndef OPENSSL_NO_ECDH
1603         EC_KEY *clnt_ecdh = NULL;
1604         EC_POINT *srvr_ecpoint = NULL;
1605         EVP_PKEY *srvr_pub_pkey = NULL;
1606         unsigned char *encodedPoint = NULL;
1607         int encoded_pt_len = 0;
1608         BN_CTX * bn_ctx = NULL;
1609 #endif
1610
1611         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1612                 {
1613                 d=(unsigned char *)s->init_buf->data;
1614                 p= &(d[4]);
1615
1616                 l=s->s3->tmp.new_cipher->algorithms;
1617
1618                 /* Fool emacs indentation */
1619                 if (0) {}
1620 #ifndef OPENSSL_NO_RSA
1621                 else if (l & SSL_kRSA)
1622                         {
1623                         RSA *rsa;
1624                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1625
1626                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1627                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1628                         else
1629                                 {
1630                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1631                                 if ((pkey == NULL) ||
1632                                         (pkey->type != EVP_PKEY_RSA) ||
1633                                         (pkey->pkey.rsa == NULL))
1634                                         {
1635                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1636                                         goto err;
1637                                         }
1638                                 rsa=pkey->pkey.rsa;
1639                                 EVP_PKEY_free(pkey);
1640                                 }
1641                                 
1642                         tmp_buf[0]=s->client_version>>8;
1643                         tmp_buf[1]=s->client_version&0xff;
1644                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1645                                         goto err;
1646
1647                         s->session->master_key_length=sizeof tmp_buf;
1648
1649                         q=p;
1650                         /* Fix buf for TLS and beyond */
1651                         if (s->version > SSL3_VERSION)
1652                                 p+=2;
1653                         n=RSA_public_encrypt(sizeof tmp_buf,
1654                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1655 #ifdef PKCS1_CHECK
1656                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1657                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1658 #endif
1659                         if (n <= 0)
1660                                 {
1661                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1662                                 goto err;
1663                                 }
1664
1665                         /* Fix buf for TLS and beyond */
1666                         if (s->version > SSL3_VERSION)
1667                                 {
1668                                 s2n(n,q);
1669                                 n+=2;
1670                                 }
1671
1672                         s->session->master_key_length=
1673                                 s->method->ssl3_enc->generate_master_secret(s,
1674                                         s->session->master_key,
1675                                         tmp_buf,sizeof tmp_buf);
1676                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1677                         }
1678 #endif
1679 #ifndef OPENSSL_NO_KRB5
1680                 else if (l & SSL_kKRB5)
1681                         {
1682                         krb5_error_code krb5rc;
1683                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1684                         /*  krb5_data   krb5_ap_req;  */
1685                         krb5_data       *enc_ticket;
1686                         krb5_data       authenticator, *authp = NULL;
1687                         EVP_CIPHER_CTX  ciph_ctx;
1688                         EVP_CIPHER      *enc = NULL;
1689                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1690                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1691                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
1692                                                 + EVP_MAX_IV_LENGTH];
1693                         int             padl, outl = sizeof(epms);
1694
1695                         EVP_CIPHER_CTX_init(&ciph_ctx);
1696
1697 #ifdef KSSL_DEBUG
1698                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1699                                 l, SSL_kKRB5);
1700 #endif  /* KSSL_DEBUG */
1701
1702                         authp = NULL;
1703 #ifdef KRB5SENDAUTH
1704                         if (KRB5SENDAUTH)  authp = &authenticator;
1705 #endif  /* KRB5SENDAUTH */
1706
1707                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1708                                 &kssl_err);
1709                         enc = kssl_map_enc(kssl_ctx->enctype);
1710                         if (enc == NULL)
1711                             goto err;
1712 #ifdef KSSL_DEBUG
1713                         {
1714                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1715                         if (krb5rc && kssl_err.text)
1716                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1717                         }
1718 #endif  /* KSSL_DEBUG */
1719
1720                         if (krb5rc)
1721                                 {
1722                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1723                                                 SSL_AD_HANDSHAKE_FAILURE);
1724                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1725                                                 kssl_err.reason);
1726                                 goto err;
1727                                 }
1728
1729                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1730                         **  in place of RFC 2712 KerberosWrapper, as in:
1731                         **
1732                         **  Send ticket (copy to *p, set n = length)
1733                         **  n = krb5_ap_req.length;
1734                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1735                         **  if (krb5_ap_req.data)  
1736                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1737                         **
1738                         **  Now using real RFC 2712 KerberosWrapper
1739                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1740                         **  Note: 2712 "opaque" types are here replaced
1741                         **  with a 2-byte length followed by the value.
1742                         **  Example:
1743                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1744                         **  Where "xx xx" = length bytes.  Shown here with
1745                         **  optional authenticator omitted.
1746                         */
1747
1748                         /*  KerberosWrapper.Ticket              */
1749                         s2n(enc_ticket->length,p);
1750                         memcpy(p, enc_ticket->data, enc_ticket->length);
1751                         p+= enc_ticket->length;
1752                         n = enc_ticket->length + 2;
1753
1754                         /*  KerberosWrapper.Authenticator       */
1755                         if (authp  &&  authp->length)  
1756                                 {
1757                                 s2n(authp->length,p);
1758                                 memcpy(p, authp->data, authp->length);
1759                                 p+= authp->length;
1760                                 n+= authp->length + 2;
1761                                 
1762                                 free(authp->data);
1763                                 authp->data = NULL;
1764                                 authp->length = 0;
1765                                 }
1766                         else
1767                                 {
1768                                 s2n(0,p);/*  null authenticator length  */
1769                                 n+=2;
1770                                 }
1771  
1772                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1773                             goto err;
1774
1775                         /*  20010420 VRS.  Tried it this way; failed.
1776                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1777                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1778                         **                              kssl_ctx->length);
1779                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1780                         */
1781
1782                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1783                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1784                                 kssl_ctx->key,iv);
1785                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1786                                 sizeof tmp_buf);
1787                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1788                         outl += padl;
1789                         if (outl > sizeof epms)
1790                                 {
1791                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1792                                 goto err;
1793                                 }
1794                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1795
1796                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1797                         s2n(outl,p);
1798                         memcpy(p, epms, outl);
1799                         p+=outl;
1800                         n+=outl + 2;
1801
1802                         s->session->master_key_length=
1803                                 s->method->ssl3_enc->generate_master_secret(s,
1804                                         s->session->master_key,
1805                                         tmp_buf, sizeof tmp_buf);
1806
1807                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1808                         OPENSSL_cleanse(epms, outl);
1809                         }
1810 #endif
1811 #ifndef OPENSSL_NO_DH
1812                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1813                         {
1814                         DH *dh_srvr,*dh_clnt;
1815
1816                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1817                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1818                         else
1819                                 {
1820                                 /* we get them from the cert */
1821                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1822                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1823                                 goto err;
1824                                 }
1825                         
1826                         /* generate a new random key */
1827                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1828                                 {
1829                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1830                                 goto err;
1831                                 }
1832                         if (!DH_generate_key(dh_clnt))
1833                                 {
1834                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1835                                 goto err;
1836                                 }
1837
1838                         /* use the 'p' output buffer for the DH key, but
1839                          * make sure to clear it out afterwards */
1840
1841                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1842
1843                         if (n <= 0)
1844                                 {
1845                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1846                                 goto err;
1847                                 }
1848
1849                         /* generate master key from the result */
1850                         s->session->master_key_length=
1851                                 s->method->ssl3_enc->generate_master_secret(s,
1852                                         s->session->master_key,p,n);
1853                         /* clean up */
1854                         memset(p,0,n);
1855
1856                         /* send off the data */
1857                         n=BN_num_bytes(dh_clnt->pub_key);
1858                         s2n(n,p);
1859                         BN_bn2bin(dh_clnt->pub_key,p);
1860                         n+=2;
1861
1862                         DH_free(dh_clnt);
1863
1864                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1865                         }
1866 #endif
1867
1868 #ifndef OPENSSL_NO_ECDH 
1869                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1870                         {
1871                         EC_GROUP *srvr_group = NULL;
1872                         int ecdh_clnt_cert = 0;
1873
1874                         /* Did we send out the client's
1875                          * ECDH share for use in premaster
1876                          * computation as part of client certificate?
1877                          * If so, set ecdh_clnt_cert to 1.
1878                          */
1879                         if ((l & SSL_kECDH) && (s->cert != NULL)) 
1880                                 {
1881                                 /* XXX: For now, we do not support client
1882                                  * authentication using ECDH certificates.
1883                                  * To add such support, one needs to add
1884                                  * code that checks for appropriate 
1885                                  * conditions and sets ecdh_clnt_cert to 1.
1886                                  * For example, the cert have an ECC
1887                                  * key on the same curve as the server's
1888                                  * and the key should be authorized for
1889                                  * key agreement.
1890                                  *
1891                                  * One also needs to add code in ssl3_connect
1892                                  * to skip sending the certificate verify
1893                                  * message.
1894                                  *
1895                                  * if ((s->cert->key->privatekey != NULL) &&
1896                                  *     (s->cert->key->privatekey->type ==
1897                                  *      EVP_PKEY_EC) && ...)
1898                                  * ecdh_clnt_cert = 1;
1899                                  */
1900                                 }
1901
1902                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1903                                 {
1904                                 srvr_group = s->session->sess_cert-> \
1905                                     peer_ecdh_tmp->group;
1906                                 srvr_ecpoint = s->session->sess_cert-> \
1907                                     peer_ecdh_tmp->pub_key;
1908                                 }
1909                         else
1910                                 {
1911                                 /* Get the Server Public Key from Cert */
1912                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1913                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1914                                 if ((srvr_pub_pkey == NULL) ||
1915                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1916                                     (srvr_pub_pkey->pkey.eckey == NULL))
1917                                         {
1918                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1919                                             ERR_R_INTERNAL_ERROR);
1920                                         goto err;
1921                                         }
1922
1923                                 srvr_group = srvr_pub_pkey->pkey.eckey->group;
1924                                 srvr_ecpoint = 
1925                                     srvr_pub_pkey->pkey.eckey->pub_key;
1926                                 }
1927
1928                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1929                                 {
1930                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1931                                     ERR_R_INTERNAL_ERROR);
1932                                 goto err;
1933                                 }
1934
1935                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
1936                                 {
1937                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1938                                 goto err;
1939                                 }
1940
1941                         clnt_ecdh->group = srvr_group;
1942                         if (ecdh_clnt_cert) 
1943                                 { 
1944                                 /* Reuse key info from our certificate
1945                                  * We only need our private key to perform
1946                                  * the ECDH computation.
1947                                  */
1948                                 clnt_ecdh->priv_key = BN_dup(s->cert->key-> \
1949                                     privatekey->pkey.eckey->priv_key);
1950                                 }
1951                         else 
1952                                 {
1953                                 /* Generate a new ECDH key pair */
1954                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1955                                         {
1956                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1957                                         goto err;
1958                                         }
1959                                 }
1960
1961                         /* use the 'p' output buffer for the ECDH key, but
1962                          * make sure to clear it out afterwards
1963                          */
1964
1965                         n=ECDH_compute_key(p, KDF1_SHA1_len, srvr_ecpoint, clnt_ecdh, KDF1_SHA1);
1966                         if (n <= 0)
1967                                 {
1968                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
1969                                        ERR_R_ECDH_LIB);
1970                                 goto err;
1971                                 }
1972
1973                         /* generate master key from the result */
1974                         s->session->master_key_length = s->method->ssl3_enc \
1975                             -> generate_master_secret(s, 
1976                                 s->session->master_key,
1977                                 p, n);
1978
1979                         memset(p, 0, n); /* clean up */
1980
1981                         if (ecdh_clnt_cert) 
1982                                 {
1983                                 /* Send empty client key exch message */
1984                                 n = 0;
1985                                 }
1986                         else 
1987                                 {
1988                                 /* First check the size of encoding and
1989                                  * allocate memory accordingly.
1990                                  */
1991                                 encoded_pt_len = 
1992                                     EC_POINT_point2oct(clnt_ecdh->group, 
1993                                         clnt_ecdh->pub_key, 
1994                                         POINT_CONVERSION_UNCOMPRESSED, 
1995                                         NULL, 0, NULL);
1996
1997                                 encodedPoint = (unsigned char *) 
1998                                     OPENSSL_malloc(encoded_pt_len * 
1999                                         sizeof(unsigned char)); 
2000                                 bn_ctx = BN_CTX_new();
2001                                 if ((encodedPoint == NULL) || 
2002                                     (bn_ctx == NULL)) 
2003                                         {
2004                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2005                                         goto err;
2006                                         }
2007
2008                                 /* Encode the public key */
2009                                 n = EC_POINT_point2oct(clnt_ecdh->group, 
2010                                     clnt_ecdh->pub_key, 
2011                                     POINT_CONVERSION_UNCOMPRESSED, 
2012                                     encodedPoint, encoded_pt_len, bn_ctx);
2013
2014                                 *p = n; /* length of encoded point */
2015                                 /* Encoded point will be copied here */
2016                                 p += 1; 
2017                                 /* copy the point */
2018                                 memcpy((unsigned char *)p, encodedPoint, n);
2019                                 /* increment n to account for length field */
2020                                 n += 1; 
2021                                 }
2022
2023                         /* Free allocated memory */
2024                         BN_CTX_free(bn_ctx);
2025                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2026                         if (clnt_ecdh != NULL) 
2027                                 {
2028                                  /* group is shared */
2029                                  clnt_ecdh->group = NULL; 
2030                                  EC_KEY_free(clnt_ecdh);
2031                                 }
2032                         EVP_PKEY_free(srvr_pub_pkey);
2033                         }
2034 #endif /* !OPENSSL_NO_ECDH */
2035                 else
2036                         {
2037                         ssl3_send_alert(s, SSL3_AL_FATAL,
2038                             SSL_AD_HANDSHAKE_FAILURE);
2039                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2040                             ERR_R_INTERNAL_ERROR);
2041                         goto err;
2042                         }
2043                 
2044                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2045                 l2n3(n,d);
2046
2047                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2048                 /* number of bytes to write */
2049                 s->init_num=n+4;
2050                 s->init_off=0;
2051                 }
2052
2053         /* SSL3_ST_CW_KEY_EXCH_B */
2054         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2055 err:
2056 #ifndef OPENSSL_NO_ECDH
2057         BN_CTX_free(bn_ctx);
2058         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2059         if (clnt_ecdh != NULL) 
2060                 {
2061                 /* group is shared */
2062                 clnt_ecdh->group = NULL; 
2063                 EC_KEY_free(clnt_ecdh);
2064                 }
2065         EVP_PKEY_free(srvr_pub_pkey);
2066 #endif
2067         return(-1);
2068         }
2069
2070 static int ssl3_send_client_verify(SSL *s)
2071         {
2072         unsigned char *p,*d;
2073         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2074         EVP_PKEY *pkey;
2075 #ifndef OPENSSL_NO_RSA
2076         unsigned u=0;
2077 #endif
2078         unsigned long n;
2079 #ifndef OPENSSL_NO_DSA
2080         int j;
2081 #endif
2082
2083         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2084                 {
2085                 d=(unsigned char *)s->init_buf->data;
2086                 p= &(d[4]);
2087                 pkey=s->cert->key->privatekey;
2088
2089                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2090                         &(data[MD5_DIGEST_LENGTH]));
2091
2092 #ifndef OPENSSL_NO_RSA
2093                 if (pkey->type == EVP_PKEY_RSA)
2094                         {
2095                         s->method->ssl3_enc->cert_verify_mac(s,
2096                                 &(s->s3->finish_dgst1),&(data[0]));
2097                         if (RSA_sign(NID_md5_sha1, data,
2098                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2099                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2100                                 {
2101                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2102                                 goto err;
2103                                 }
2104                         s2n(u,p);
2105                         n=u+2;
2106                         }
2107                 else
2108 #endif
2109 #ifndef OPENSSL_NO_DSA
2110                         if (pkey->type == EVP_PKEY_DSA)
2111                         {
2112                         if (!DSA_sign(pkey->save_type,
2113                                 &(data[MD5_DIGEST_LENGTH]),
2114                                 SHA_DIGEST_LENGTH,&(p[2]),
2115                                 (unsigned int *)&j,pkey->pkey.dsa))
2116                                 {
2117                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2118                                 goto err;
2119                                 }
2120                         s2n(j,p);
2121                         n=j+2;
2122                         }
2123                 else
2124 #endif
2125 #ifndef OPENSSL_NO_ECDSA
2126                         if (pkey->type == EVP_PKEY_EC)
2127                         {
2128                         if (!ECDSA_sign(pkey->save_type,
2129                                 &(data[MD5_DIGEST_LENGTH]),
2130                                 SHA_DIGEST_LENGTH,&(p[2]),
2131                                 (unsigned int *)&j,pkey->pkey.eckey))
2132                                 {
2133                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2134                                     ERR_R_ECDSA_LIB);
2135                                 goto err;
2136                                 }
2137                         s2n(j,p);
2138                         n=j+2;
2139                         }
2140                 else
2141 #endif
2142                         {
2143                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2144                         goto err;
2145                         }
2146                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2147                 l2n3(n,d);
2148
2149                 s->init_num=(int)n+4;
2150                 s->init_off=0;
2151                 }
2152         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2153 err:
2154         return(-1);
2155         }
2156
2157 static int ssl3_send_client_certificate(SSL *s)
2158         {
2159         X509 *x509=NULL;
2160         EVP_PKEY *pkey=NULL;
2161         int i;
2162         unsigned long l;
2163
2164         if (s->state == SSL3_ST_CW_CERT_A)
2165                 {
2166                 if ((s->cert == NULL) ||
2167                         (s->cert->key->x509 == NULL) ||
2168                         (s->cert->key->privatekey == NULL))
2169                         s->state=SSL3_ST_CW_CERT_B;
2170                 else
2171                         s->state=SSL3_ST_CW_CERT_C;
2172                 }
2173
2174         /* We need to get a client cert */
2175         if (s->state == SSL3_ST_CW_CERT_B)
2176                 {
2177                 /* If we get an error, we need to
2178                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2179                  * We then get retied later */
2180                 i=0;
2181                 if (s->ctx->client_cert_cb != NULL)
2182                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2183                 if (i < 0)
2184                         {
2185                         s->rwstate=SSL_X509_LOOKUP;
2186                         return(-1);
2187                         }
2188                 s->rwstate=SSL_NOTHING;
2189                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2190                         {
2191                         s->state=SSL3_ST_CW_CERT_B;
2192                         if (    !SSL_use_certificate(s,x509) ||
2193                                 !SSL_use_PrivateKey(s,pkey))
2194                                 i=0;
2195                         }
2196                 else if (i == 1)
2197                         {
2198                         i=0;
2199                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2200                         }
2201
2202                 if (x509 != NULL) X509_free(x509);
2203                 if (pkey != NULL) EVP_PKEY_free(pkey);
2204                 if (i == 0)
2205                         {
2206                         if (s->version == SSL3_VERSION)
2207                                 {
2208                                 s->s3->tmp.cert_req=0;
2209                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2210                                 return(1);
2211                                 }
2212                         else
2213                                 {
2214                                 s->s3->tmp.cert_req=2;
2215                                 }
2216                         }
2217
2218                 /* Ok, we have a cert */
2219                 s->state=SSL3_ST_CW_CERT_C;
2220                 }
2221
2222         if (s->state == SSL3_ST_CW_CERT_C)
2223                 {
2224                 s->state=SSL3_ST_CW_CERT_D;
2225                 l=ssl3_output_cert_chain(s,
2226                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2227                 s->init_num=(int)l;
2228                 s->init_off=0;
2229                 }
2230         /* SSL3_ST_CW_CERT_D */
2231         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2232         }
2233
2234 #define has_bits(i,m)   (((i)&(m)) == (m))
2235
2236 static int ssl3_check_cert_and_algorithm(SSL *s)
2237         {
2238         int i,idx;
2239         long algs;
2240         EVP_PKEY *pkey=NULL;
2241         SESS_CERT *sc;
2242 #ifndef OPENSSL_NO_RSA
2243         RSA *rsa;
2244 #endif
2245 #ifndef OPENSSL_NO_DH
2246         DH *dh;
2247 #endif
2248
2249         sc=s->session->sess_cert;
2250
2251         if (sc == NULL)
2252                 {
2253                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2254                 goto err;
2255                 }
2256
2257         algs=s->s3->tmp.new_cipher->algorithms;
2258
2259         /* we don't have a certificate */
2260         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2261                 return(1);
2262
2263 #ifndef OPENSSL_NO_RSA
2264         rsa=s->session->sess_cert->peer_rsa_tmp;
2265 #endif
2266 #ifndef OPENSSL_NO_DH
2267         dh=s->session->sess_cert->peer_dh_tmp;
2268 #endif
2269
2270         /* This is the passed certificate */
2271
2272         idx=sc->peer_cert_type;
2273 #ifndef OPENSSL_NO_ECDH
2274         if (idx == SSL_PKEY_ECC)
2275                 {
2276                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2277                     s->s3->tmp.new_cipher) == 0) 
2278                         { /* check failed */
2279                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2280                         goto f_err;                     
2281                         }
2282                 else 
2283                         {
2284                         return 1;
2285                         }
2286                 }
2287 #endif
2288         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2289         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2290         EVP_PKEY_free(pkey);
2291
2292         
2293         /* Check that we have a certificate if we require one */
2294         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2295                 {
2296                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2297                 goto f_err;
2298                 }
2299 #ifndef OPENSSL_NO_DSA
2300         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2301                 {
2302                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2303                 goto f_err;
2304                 }
2305 #endif
2306 #ifndef OPENSSL_NO_RSA
2307         if ((algs & SSL_kRSA) &&
2308                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2309                 {
2310                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2311                 goto f_err;
2312                 }
2313 #endif
2314 #ifndef OPENSSL_NO_DH
2315         if ((algs & SSL_kEDH) &&
2316                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2317                 {
2318                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2319                 goto f_err;
2320                 }
2321         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2322                 {
2323                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2324                 goto f_err;
2325                 }
2326 #ifndef OPENSSL_NO_DSA
2327         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2328                 {
2329                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2330                 goto f_err;
2331                 }
2332 #endif
2333 #endif
2334
2335         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2336                 {
2337 #ifndef OPENSSL_NO_RSA
2338                 if (algs & SSL_kRSA)
2339                         {
2340                         if (rsa == NULL
2341                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2342                                 {
2343                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2344                                 goto f_err;
2345                                 }
2346                         }
2347                 else
2348 #endif
2349 #ifndef OPENSSL_NO_DH
2350                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2351                             {
2352                             if (dh == NULL
2353                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2354                                 {
2355                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2356                                 goto f_err;
2357                                 }
2358                         }
2359                 else
2360 #endif
2361                         {
2362                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2363                         goto f_err;
2364                         }
2365                 }
2366         return(1);
2367 f_err:
2368         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2369 err:
2370         return(0);
2371         }
2372
2373
2374 #ifndef OPENSSL_NO_ECDH
2375 /* This is the complement of nid2curve_id in s3_srvr.c. */
2376 static int curve_id2nid(int curve_id)
2377 {
2378         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001) */
2379         static int nid_list[26] =
2380         {
2381                 0,
2382                 NID_sect163k1, /* sect163k1 (1) */
2383                 NID_sect163r1, /* sect163r1 (2) */
2384                 NID_sect163r2, /* sect163r2 (3) */
2385                 NID_sect193r1, /* sect193r1 (4) */ 
2386                 NID_sect193r2, /* sect193r2 (5) */ 
2387                 NID_sect233k1, /* sect233k1 (6) */
2388                 NID_sect233r1, /* sect233r1 (7) */ 
2389                 NID_sect239k1, /* sect239k1 (8) */ 
2390                 NID_sect283k1, /* sect283k1 (9) */
2391                 NID_sect283r1, /* sect283r1 (10) */ 
2392                 NID_sect409k1, /* sect409k1 (11) */ 
2393                 NID_sect409r1, /* sect409r1 (12) */
2394                 NID_sect571k1, /* sect571k1 (13) */ 
2395                 NID_sect571r1, /* sect571r1 (14) */ 
2396                 NID_secp160k1, /* secp160k1 (15) */
2397                 NID_secp160r1, /* secp160r1 (16) */ 
2398                 NID_secp160r2, /* secp160r2 (17) */ 
2399                 NID_secp192k1, /* secp192k1 (18) */
2400                 NID_X9_62_prime192v1, /* secp192r1 (19) */ 
2401                 NID_secp224k1, /* secp224k1 (20) */ 
2402                 NID_secp224r1, /* secp224r1 (21) */
2403                 NID_secp256k1, /* secp256k1 (22) */ 
2404                 NID_X9_62_prime256v1, /* secp256r1 (23) */ 
2405                 NID_secp384r1, /* secp384r1 (24) */
2406                 NID_secp521r1  /* secp521r1 (25) */     
2407         };
2408         
2409         if ((curve_id < 1) || (curve_id > 25)) return 0;
2410
2411         return nid_list[curve_id];
2412 }
2413 #endif