09f6c8d3ab02a0506cdfeb3d9bc490a67daf4b66
[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
134 static SSL_METHOD *ssl3_get_client_method(int ver);
135 static int ssl3_client_hello(SSL *s);
136 static int ssl3_get_server_hello(SSL *s);
137 static int ssl3_get_certificate_request(SSL *s);
138 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
139 static int ssl3_get_server_done(SSL *s);
140 static int ssl3_send_client_verify(SSL *s);
141 static int ssl3_send_client_certificate(SSL *s);
142 static int ssl3_send_client_key_exchange(SSL *s);
143 static int ssl3_get_key_exchange(SSL *s);
144 static int ssl3_get_server_certificate(SSL *s);
145 static int ssl3_check_cert_and_algorithm(SSL *s);
146
147 #ifndef OPENSSL_NO_ECDH
148 static int curve_id2nid(int curve_id);
149 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
150 #endif
151
152 static SSL_METHOD *ssl3_get_client_method(int ver)
153         {
154         if (ver == SSL3_VERSION)
155                 return(SSLv3_client_method());
156         else
157                 return(NULL);
158         }
159
160 SSL_METHOD *SSLv3_client_method(void)
161         {
162         static int init=1;
163         static SSL_METHOD SSLv3_client_data;
164
165         if (init)
166                 {
167                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
168
169                 if (init)
170                         {
171                         memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
172                                 sizeof(SSL_METHOD));
173                         SSLv3_client_data.ssl_connect=ssl3_connect;
174                         SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
175                         init=0;
176                         }
177
178                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
179                 }
180         return(&SSLv3_client_data);
181         }
182
183 int ssl3_connect(SSL *s)
184         {
185         BUF_MEM *buf=NULL;
186         unsigned long Time=time(NULL),l;
187         long num1;
188         void (*cb)(const SSL *ssl,int type,int val)=NULL;
189         int ret= -1;
190         int new_state,state,skip=0;;
191
192         RAND_add(&Time,sizeof(Time),0);
193         ERR_clear_error();
194         clear_sys_error();
195
196         if (s->info_callback != NULL)
197                 cb=s->info_callback;
198         else if (s->ctx->info_callback != NULL)
199                 cb=s->ctx->info_callback;
200         
201         s->in_handshake++;
202         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
203
204         for (;;)
205                 {
206                 state=s->state;
207
208                 switch(s->state)
209                         {
210                 case SSL_ST_RENEGOTIATE:
211                         s->new_session=1;
212                         s->state=SSL_ST_CONNECT;
213                         s->ctx->stats.sess_connect_renegotiate++;
214                         /* break */
215                 case SSL_ST_BEFORE:
216                 case SSL_ST_CONNECT:
217                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
218                 case SSL_ST_OK|SSL_ST_CONNECT:
219
220                         s->server=0;
221                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
222
223                         if ((s->version & 0xff00 ) != 0x0300)
224                                 {
225                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
226                                 ret = -1;
227                                 goto end;
228                                 }
229                                 
230                         /* s->version=SSL3_VERSION; */
231                         s->type=SSL_ST_CONNECT;
232
233                         if (s->init_buf == NULL)
234                                 {
235                                 if ((buf=BUF_MEM_new()) == NULL)
236                                         {
237                                         ret= -1;
238                                         goto end;
239                                         }
240                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
241                                         {
242                                         ret= -1;
243                                         goto end;
244                                         }
245                                 s->init_buf=buf;
246                                 buf=NULL;
247                                 }
248
249                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
250
251                         /* setup buffing BIO */
252                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
253
254                         /* don't push the buffering BIO quite yet */
255
256                         ssl3_init_finished_mac(s);
257
258                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
259                         s->ctx->stats.sess_connect++;
260                         s->init_num=0;
261                         break;
262
263                 case SSL3_ST_CW_CLNT_HELLO_A:
264                 case SSL3_ST_CW_CLNT_HELLO_B:
265
266                         s->shutdown=0;
267                         ret=ssl3_client_hello(s);
268                         if (ret <= 0) goto end;
269                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
270                         s->init_num=0;
271
272                         /* turn on buffering for the next lot of output */
273                         if (s->bbio != s->wbio)
274                                 s->wbio=BIO_push(s->bbio,s->wbio);
275
276                         break;
277
278                 case SSL3_ST_CR_SRVR_HELLO_A:
279                 case SSL3_ST_CR_SRVR_HELLO_B:
280                         ret=ssl3_get_server_hello(s);
281                         if (ret <= 0) goto end;
282                         if (s->hit)
283                                 s->state=SSL3_ST_CR_FINISHED_A;
284                         else
285                                 s->state=SSL3_ST_CR_CERT_A;
286                         s->init_num=0;
287                         break;
288
289                 case SSL3_ST_CR_CERT_A:
290                 case SSL3_ST_CR_CERT_B:
291                         /* Check if it is anon DH/ECDH */
292                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
293                                 {
294                                 ret=ssl3_get_server_certificate(s);
295                                 if (ret <= 0) goto end;
296                                 }
297                         else
298                                 skip=1;
299                         s->state=SSL3_ST_CR_KEY_EXCH_A;
300                         s->init_num=0;
301                         break;
302
303                 case SSL3_ST_CR_KEY_EXCH_A:
304                 case SSL3_ST_CR_KEY_EXCH_B:
305                         ret=ssl3_get_key_exchange(s);
306                         if (ret <= 0) goto end;
307                         s->state=SSL3_ST_CR_CERT_REQ_A;
308                         s->init_num=0;
309
310                         /* at this point we check that we have the
311                          * required stuff from the server */
312                         if (!ssl3_check_cert_and_algorithm(s))
313                                 {
314                                 ret= -1;
315                                 goto end;
316                                 }
317                         break;
318
319                 case SSL3_ST_CR_CERT_REQ_A:
320                 case SSL3_ST_CR_CERT_REQ_B:
321                         ret=ssl3_get_certificate_request(s);
322                         if (ret <= 0) goto end;
323                         s->state=SSL3_ST_CR_SRVR_DONE_A;
324                         s->init_num=0;
325                         break;
326
327                 case SSL3_ST_CR_SRVR_DONE_A:
328                 case SSL3_ST_CR_SRVR_DONE_B:
329                         ret=ssl3_get_server_done(s);
330                         if (ret <= 0) goto end;
331                         if (s->s3->tmp.cert_req)
332                                 s->state=SSL3_ST_CW_CERT_A;
333                         else
334                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
335                         s->init_num=0;
336
337                         break;
338
339                 case SSL3_ST_CW_CERT_A:
340                 case SSL3_ST_CW_CERT_B:
341                 case SSL3_ST_CW_CERT_C:
342                 case SSL3_ST_CW_CERT_D:
343                         ret=ssl3_send_client_certificate(s);
344                         if (ret <= 0) goto end;
345                         s->state=SSL3_ST_CW_KEY_EXCH_A;
346                         s->init_num=0;
347                         break;
348
349                 case SSL3_ST_CW_KEY_EXCH_A:
350                 case SSL3_ST_CW_KEY_EXCH_B:
351                         ret=ssl3_send_client_key_exchange(s);
352                         if (ret <= 0) goto end;
353                         l=s->s3->tmp.new_cipher->algorithms;
354                         /* EAY EAY EAY need to check for DH fix cert
355                          * sent back */
356                         /* For TLS, cert_req is set to 2, so a cert chain
357                          * of nothing is sent, but no verify packet is sent */
358                         /* XXX: For now, we do not support client 
359                          * authentication in ECDH cipher suites with
360                          * ECDH (rather than ECDSA) certificates.
361                          * We need to skip the certificate verify 
362                          * message when client's ECDH public key is sent 
363                          * inside the client certificate.
364                          */
365                         if (s->s3->tmp.cert_req == 1)
366                                 {
367                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
368                                 }
369                         else
370                                 {
371                                 s->state=SSL3_ST_CW_CHANGE_A;
372                                 s->s3->change_cipher_spec=0;
373                                 }
374
375                         s->init_num=0;
376                         break;
377
378                 case SSL3_ST_CW_CERT_VRFY_A:
379                 case SSL3_ST_CW_CERT_VRFY_B:
380                         ret=ssl3_send_client_verify(s);
381                         if (ret <= 0) goto end;
382                         s->state=SSL3_ST_CW_CHANGE_A;
383                         s->init_num=0;
384                         s->s3->change_cipher_spec=0;
385                         break;
386
387                 case SSL3_ST_CW_CHANGE_A:
388                 case SSL3_ST_CW_CHANGE_B:
389                         ret=ssl3_send_change_cipher_spec(s,
390                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
391                         if (ret <= 0) goto end;
392                         s->state=SSL3_ST_CW_FINISHED_A;
393                         s->init_num=0;
394
395                         s->session->cipher=s->s3->tmp.new_cipher;
396                         if (s->s3->tmp.new_compression == NULL)
397                                 s->session->compress_meth=0;
398                         else
399                                 s->session->compress_meth=
400                                         s->s3->tmp.new_compression->id;
401                         if (!s->method->ssl3_enc->setup_key_block(s))
402                                 {
403                                 ret= -1;
404                                 goto end;
405                                 }
406
407                         if (!s->method->ssl3_enc->change_cipher_state(s,
408                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
409                                 {
410                                 ret= -1;
411                                 goto end;
412                                 }
413
414                         break;
415
416                 case SSL3_ST_CW_FINISHED_A:
417                 case SSL3_ST_CW_FINISHED_B:
418                         ret=ssl3_send_finished(s,
419                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
420                                 s->method->ssl3_enc->client_finished_label,
421                                 s->method->ssl3_enc->client_finished_label_len);
422                         if (ret <= 0) goto end;
423                         s->state=SSL3_ST_CW_FLUSH;
424
425                         /* clear flags */
426                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
427                         if (s->hit)
428                                 {
429                                 s->s3->tmp.next_state=SSL_ST_OK;
430                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
431                                         {
432                                         s->state=SSL_ST_OK;
433                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
434                                         s->s3->delay_buf_pop_ret=0;
435                                         }
436                                 }
437                         else
438                                 {
439                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
440                                 }
441                         s->init_num=0;
442                         break;
443
444                 case SSL3_ST_CR_FINISHED_A:
445                 case SSL3_ST_CR_FINISHED_B:
446
447                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
448                                 SSL3_ST_CR_FINISHED_B);
449                         if (ret <= 0) goto end;
450
451                         if (s->hit)
452                                 s->state=SSL3_ST_CW_CHANGE_A;
453                         else
454                                 s->state=SSL_ST_OK;
455                         s->init_num=0;
456                         break;
457
458                 case SSL3_ST_CW_FLUSH:
459                         /* number of bytes to be flushed */
460                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
461                         if (num1 > 0)
462                                 {
463                                 s->rwstate=SSL_WRITING;
464                                 num1=BIO_flush(s->wbio);
465                                 if (num1 <= 0) { ret= -1; goto end; }
466                                 s->rwstate=SSL_NOTHING;
467                                 }
468
469                         s->state=s->s3->tmp.next_state;
470                         break;
471
472                 case SSL_ST_OK:
473                         /* clean a few things up */
474                         ssl3_cleanup_key_block(s);
475
476                         if (s->init_buf != NULL)
477                                 {
478                                 BUF_MEM_free(s->init_buf);
479                                 s->init_buf=NULL;
480                                 }
481
482                         /* If we are not 'joining' the last two packets,
483                          * remove the buffering now */
484                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
485                                 ssl_free_wbio_buffer(s);
486                         /* else do it later in ssl3_write */
487
488                         s->init_num=0;
489                         s->new_session=0;
490
491                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
492                         if (s->hit) s->ctx->stats.sess_hit++;
493
494                         ret=1;
495                         /* s->server=0; */
496                         s->handshake_func=ssl3_connect;
497                         s->ctx->stats.sess_connect_good++;
498
499                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
500
501                         goto end;
502                         /* break; */
503                         
504                 default:
505                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
506                         ret= -1;
507                         goto end;
508                         /* break; */
509                         }
510
511                 /* did we do anything */
512                 if (!s->s3->tmp.reuse_message && !skip)
513                         {
514                         if (s->debug)
515                                 {
516                                 if ((ret=BIO_flush(s->wbio)) <= 0)
517                                         goto end;
518                                 }
519
520                         if ((cb != NULL) && (s->state != state))
521                                 {
522                                 new_state=s->state;
523                                 s->state=state;
524                                 cb(s,SSL_CB_CONNECT_LOOP,1);
525                                 s->state=new_state;
526                                 }
527                         }
528                 skip=0;
529                 }
530 end:
531         s->in_handshake--;
532         if (buf != NULL)
533                 BUF_MEM_free(buf);
534         if (cb != NULL)
535                 cb(s,SSL_CB_CONNECT_EXIT,ret);
536         return(ret);
537         }
538
539
540 static int ssl3_client_hello(SSL *s)
541         {
542         unsigned char *buf;
543         unsigned char *p,*d;
544         int i,j;
545         unsigned long Time,l;
546         SSL_COMP *comp;
547
548         buf=(unsigned char *)s->init_buf->data;
549         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
550                 {
551                 if ((s->session == NULL) ||
552                         (s->session->ssl_version != s->version) ||
553                         (s->session->not_resumable))
554                         {
555                         if (!ssl_get_new_session(s,0))
556                                 goto err;
557                         }
558                 /* else use the pre-loaded session */
559
560                 p=s->s3->client_random;
561                 Time=time(NULL);                        /* Time */
562                 l2n(Time,p);
563                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
564
565                 /* Do the message type and length last */
566                 d=p= &(buf[4]);
567
568                 *(p++)=s->version>>8;
569                 *(p++)=s->version&0xff;
570                 s->client_version=s->version;
571
572                 /* Random stuff */
573                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
574                 p+=SSL3_RANDOM_SIZE;
575
576                 /* Session ID */
577                 if (s->new_session)
578                         i=0;
579                 else
580                         i=s->session->session_id_length;
581                 *(p++)=i;
582                 if (i != 0)
583                         {
584                         if (i > (int)sizeof(s->session->session_id))
585                                 {
586                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
587                                 goto err;
588                                 }
589                         memcpy(p,s->session->session_id,i);
590                         p+=i;
591                         }
592                 
593                 /* Ciphers supported */
594                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
595                 if (i == 0)
596                         {
597                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
598                         goto err;
599                         }
600                 s2n(i,p);
601                 p+=i;
602
603                 /* COMPRESSION */
604                 if (s->ctx->comp_methods == NULL)
605                         j=0;
606                 else
607                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
608                 *(p++)=1+j;
609                 for (i=0; i<j; i++)
610                         {
611                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
612                         *(p++)=comp->id;
613                         }
614                 *(p++)=0; /* Add the NULL method */
615                 
616                 l=(p-d);
617                 d=buf;
618                 *(d++)=SSL3_MT_CLIENT_HELLO;
619                 l2n3(l,d);
620
621                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
622                 /* number of bytes to write */
623                 s->init_num=p-buf;
624                 s->init_off=0;
625                 }
626
627         /* SSL3_ST_CW_CLNT_HELLO_B */
628         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
629 err:
630         return(-1);
631         }
632
633 static int ssl3_get_server_hello(SSL *s)
634         {
635         STACK_OF(SSL_CIPHER) *sk;
636         SSL_CIPHER *c;
637         unsigned char *p,*d;
638         int i,al,ok;
639         unsigned int j;
640         long n;
641         SSL_COMP *comp;
642
643         n=ssl3_get_message(s,
644                 SSL3_ST_CR_SRVR_HELLO_A,
645                 SSL3_ST_CR_SRVR_HELLO_B,
646                 SSL3_MT_SERVER_HELLO,
647                 300, /* ?? */
648                 &ok);
649
650         if (!ok) return((int)n);
651         d=p=(unsigned char *)s->init_msg;
652
653         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
654                 {
655                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
656                 s->version=(s->version&0xff00)|p[1];
657                 al=SSL_AD_PROTOCOL_VERSION;
658                 goto f_err;
659                 }
660         p+=2;
661
662         /* load the server hello data */
663         /* load the server random */
664         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
665         p+=SSL3_RANDOM_SIZE;
666
667         /* get the session-id */
668         j= *(p++);
669
670         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
671                 {
672                 al=SSL_AD_ILLEGAL_PARAMETER;
673                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
674                 goto f_err;
675                 }
676
677         if (j != 0 && j == s->session->session_id_length
678             && memcmp(p,s->session->session_id,j) == 0)
679             {
680             if(s->sid_ctx_length != s->session->sid_ctx_length
681                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
682                 {
683                 /* actually a client application bug */
684                 al=SSL_AD_ILLEGAL_PARAMETER;
685                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
686                 goto f_err;
687                 }
688             s->hit=1;
689             }
690         else    /* a miss or crap from the other end */
691                 {
692                 /* If we were trying for session-id reuse, make a new
693                  * SSL_SESSION so we don't stuff up other people */
694                 s->hit=0;
695                 if (s->session->session_id_length > 0)
696                         {
697                         if (!ssl_get_new_session(s,0))
698                                 {
699                                 al=SSL_AD_INTERNAL_ERROR;
700                                 goto f_err;
701                                 }
702                         }
703                 s->session->session_id_length=j;
704                 memcpy(s->session->session_id,p,j); /* j could be 0 */
705                 }
706         p+=j;
707         c=ssl_get_cipher_by_char(s,p);
708         if (c == NULL)
709                 {
710                 /* unknown cipher */
711                 al=SSL_AD_ILLEGAL_PARAMETER;
712                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
713                 goto f_err;
714                 }
715         p+=ssl_put_cipher_by_char(s,NULL,NULL);
716
717         sk=ssl_get_ciphers_by_id(s);
718         i=sk_SSL_CIPHER_find(sk,c);
719         if (i < 0)
720                 {
721                 /* we did not say we would use this cipher */
722                 al=SSL_AD_ILLEGAL_PARAMETER;
723                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
724                 goto f_err;
725                 }
726
727         /* Depending on the session caching (internal/external), the cipher
728            and/or cipher_id values may not be set. Make sure that
729            cipher_id is set and use it for comparison. */
730         if (s->session->cipher)
731                 s->session->cipher_id = s->session->cipher->id;
732         if (s->hit && (s->session->cipher_id != c->id))
733                 {
734                 if (!(s->options &
735                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
736                         {
737                         al=SSL_AD_ILLEGAL_PARAMETER;
738                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
739                         goto f_err;
740                         }
741                 }
742         s->s3->tmp.new_cipher=c;
743
744         /* lets get the compression algorithm */
745         /* COMPRESSION */
746         j= *(p++);
747         if (j == 0)
748                 comp=NULL;
749         else
750                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
751         
752         if ((j != 0) && (comp == NULL))
753                 {
754                 al=SSL_AD_ILLEGAL_PARAMETER;
755                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
756                 goto f_err;
757                 }
758         else
759                 {
760                 s->s3->tmp.new_compression=comp;
761                 }
762
763         if (p != (d+n))
764                 {
765                 /* wrong packet length */
766                 al=SSL_AD_DECODE_ERROR;
767                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
768                 goto err;
769                 }
770
771         return(1);
772 f_err:
773         ssl3_send_alert(s,SSL3_AL_FATAL,al);
774 err:
775         return(-1);
776         }
777
778 static int ssl3_get_server_certificate(SSL *s)
779         {
780         int al,i,ok,ret= -1;
781         unsigned long n,nc,llen,l;
782         X509 *x=NULL;
783         const unsigned char *q,*p;
784         unsigned char *d;
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         p=d=(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         const unsigned char *p,*q;
1413         unsigned char *d;
1414         STACK_OF(X509_NAME) *ca_sk=NULL;
1415
1416         n=ssl3_get_message(s,
1417                 SSL3_ST_CR_CERT_REQ_A,
1418                 SSL3_ST_CR_CERT_REQ_B,
1419                 -1,
1420                 s->max_cert_list,
1421                 &ok);
1422
1423         if (!ok) return((int)n);
1424
1425         s->s3->tmp.cert_req=0;
1426
1427         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1428                 {
1429                 s->s3->tmp.reuse_message=1;
1430                 return(1);
1431                 }
1432
1433         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1434                 {
1435                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1436                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1437                 goto err;
1438                 }
1439
1440         /* TLS does not like anon-DH with client cert */
1441         if (s->version > SSL3_VERSION)
1442                 {
1443                 l=s->s3->tmp.new_cipher->algorithms;
1444                 if (l & SSL_aNULL)
1445                         {
1446                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1447                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1448                         goto err;
1449                         }
1450                 }
1451
1452         p=d=(unsigned char *)s->init_msg;
1453
1454         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1455                 {
1456                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1457                 goto err;
1458                 }
1459
1460         /* get the certificate types */
1461         ctype_num= *(p++);
1462         if (ctype_num > SSL3_CT_NUMBER)
1463                 ctype_num=SSL3_CT_NUMBER;
1464         for (i=0; i<ctype_num; i++)
1465                 s->s3->tmp.ctype[i]= p[i];
1466         p+=ctype_num;
1467
1468         /* get the CA RDNs */
1469         n2s(p,llen);
1470 #if 0
1471 {
1472 FILE *out;
1473 out=fopen("/tmp/vsign.der","w");
1474 fwrite(p,1,llen,out);
1475 fclose(out);
1476 }
1477 #endif
1478
1479         if ((llen+ctype_num+2+1) != n)
1480                 {
1481                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1482                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1483                 goto err;
1484                 }
1485
1486         for (nc=0; nc<llen; )
1487                 {
1488                 n2s(p,l);
1489                 if ((l+nc+2) > llen)
1490                         {
1491                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1492                                 goto cont; /* netscape bugs */
1493                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1494                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1495                         goto err;
1496                         }
1497
1498                 q=p;
1499
1500                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1501                         {
1502                         /* If netscape tolerance is on, ignore errors */
1503                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1504                                 goto cont;
1505                         else
1506                                 {
1507                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1508                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1509                                 goto err;
1510                                 }
1511                         }
1512
1513                 if (q != (p+l))
1514                         {
1515                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1516                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1517                         goto err;
1518                         }
1519                 if (!sk_X509_NAME_push(ca_sk,xn))
1520                         {
1521                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1522                         goto err;
1523                         }
1524
1525                 p+=l;
1526                 nc+=l+2;
1527                 }
1528
1529         if (0)
1530                 {
1531 cont:
1532                 ERR_clear_error();
1533                 }
1534
1535         /* we should setup a certificate to return.... */
1536         s->s3->tmp.cert_req=1;
1537         s->s3->tmp.ctype_num=ctype_num;
1538         if (s->s3->tmp.ca_names != NULL)
1539                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1540         s->s3->tmp.ca_names=ca_sk;
1541         ca_sk=NULL;
1542
1543         ret=1;
1544 err:
1545         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1546         return(ret);
1547         }
1548
1549 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1550         {
1551         return(X509_NAME_cmp(*a,*b));
1552         }
1553
1554 static int ssl3_get_server_done(SSL *s)
1555         {
1556         int ok,ret=0;
1557         long n;
1558
1559         n=ssl3_get_message(s,
1560                 SSL3_ST_CR_SRVR_DONE_A,
1561                 SSL3_ST_CR_SRVR_DONE_B,
1562                 SSL3_MT_SERVER_DONE,
1563                 30, /* should be very small, like 0 :-) */
1564                 &ok);
1565
1566         if (!ok) return((int)n);
1567         if (n > 0)
1568                 {
1569                 /* should contain no data */
1570                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1571                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1572                 return -1;
1573                 }
1574         ret=1;
1575         return(ret);
1576         }
1577
1578
1579 static const int KDF1_SHA1_len = 20;
1580 static void *KDF1_SHA1(void *in, size_t inlen, void *out, size_t outlen)
1581         {
1582 #ifndef OPENSSL_NO_SHA
1583         if (outlen != SHA_DIGEST_LENGTH)
1584                 return NULL;
1585         return SHA1(in, inlen, out);
1586 #else
1587         return NULL;
1588 #endif
1589         }
1590
1591 static int ssl3_send_client_key_exchange(SSL *s)
1592         {
1593         unsigned char *p,*d;
1594         int n;
1595         unsigned long l;
1596 #ifndef OPENSSL_NO_RSA
1597         unsigned char *q;
1598         EVP_PKEY *pkey=NULL;
1599 #endif
1600 #ifndef OPENSSL_NO_KRB5
1601         KSSL_ERR kssl_err;
1602 #endif /* OPENSSL_NO_KRB5 */
1603 #ifndef OPENSSL_NO_ECDH
1604         EC_KEY *clnt_ecdh = NULL;
1605         EC_POINT *srvr_ecpoint = NULL;
1606         EVP_PKEY *srvr_pub_pkey = NULL;
1607         unsigned char *encodedPoint = NULL;
1608         int encoded_pt_len = 0;
1609         BN_CTX * bn_ctx = NULL;
1610 #endif
1611
1612         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1613                 {
1614                 d=(unsigned char *)s->init_buf->data;
1615                 p= &(d[4]);
1616
1617                 l=s->s3->tmp.new_cipher->algorithms;
1618
1619                 /* Fool emacs indentation */
1620                 if (0) {}
1621 #ifndef OPENSSL_NO_RSA
1622                 else if (l & SSL_kRSA)
1623                         {
1624                         RSA *rsa;
1625                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1626
1627                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1628                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1629                         else
1630                                 {
1631                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1632                                 if ((pkey == NULL) ||
1633                                         (pkey->type != EVP_PKEY_RSA) ||
1634                                         (pkey->pkey.rsa == NULL))
1635                                         {
1636                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1637                                         goto err;
1638                                         }
1639                                 rsa=pkey->pkey.rsa;
1640                                 EVP_PKEY_free(pkey);
1641                                 }
1642                                 
1643                         tmp_buf[0]=s->client_version>>8;
1644                         tmp_buf[1]=s->client_version&0xff;
1645                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1646                                         goto err;
1647
1648                         s->session->master_key_length=sizeof tmp_buf;
1649
1650                         q=p;
1651                         /* Fix buf for TLS and beyond */
1652                         if (s->version > SSL3_VERSION)
1653                                 p+=2;
1654                         n=RSA_public_encrypt(sizeof tmp_buf,
1655                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1656 #ifdef PKCS1_CHECK
1657                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1658                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1659 #endif
1660                         if (n <= 0)
1661                                 {
1662                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1663                                 goto err;
1664                                 }
1665
1666                         /* Fix buf for TLS and beyond */
1667                         if (s->version > SSL3_VERSION)
1668                                 {
1669                                 s2n(n,q);
1670                                 n+=2;
1671                                 }
1672
1673                         s->session->master_key_length=
1674                                 s->method->ssl3_enc->generate_master_secret(s,
1675                                         s->session->master_key,
1676                                         tmp_buf,sizeof tmp_buf);
1677                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1678                         }
1679 #endif
1680 #ifndef OPENSSL_NO_KRB5
1681                 else if (l & SSL_kKRB5)
1682                         {
1683                         krb5_error_code krb5rc;
1684                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1685                         /*  krb5_data   krb5_ap_req;  */
1686                         krb5_data       *enc_ticket;
1687                         krb5_data       authenticator, *authp = NULL;
1688                         EVP_CIPHER_CTX  ciph_ctx;
1689                         EVP_CIPHER      *enc = NULL;
1690                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1691                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1692                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
1693                                                 + EVP_MAX_IV_LENGTH];
1694                         int             padl, outl = sizeof(epms);
1695
1696                         EVP_CIPHER_CTX_init(&ciph_ctx);
1697
1698 #ifdef KSSL_DEBUG
1699                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1700                                 l, SSL_kKRB5);
1701 #endif  /* KSSL_DEBUG */
1702
1703                         authp = NULL;
1704 #ifdef KRB5SENDAUTH
1705                         if (KRB5SENDAUTH)  authp = &authenticator;
1706 #endif  /* KRB5SENDAUTH */
1707
1708                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1709                                 &kssl_err);
1710                         enc = kssl_map_enc(kssl_ctx->enctype);
1711                         if (enc == NULL)
1712                             goto err;
1713 #ifdef KSSL_DEBUG
1714                         {
1715                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1716                         if (krb5rc && kssl_err.text)
1717                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1718                         }
1719 #endif  /* KSSL_DEBUG */
1720
1721                         if (krb5rc)
1722                                 {
1723                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1724                                                 SSL_AD_HANDSHAKE_FAILURE);
1725                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1726                                                 kssl_err.reason);
1727                                 goto err;
1728                                 }
1729
1730                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1731                         **  in place of RFC 2712 KerberosWrapper, as in:
1732                         **
1733                         **  Send ticket (copy to *p, set n = length)
1734                         **  n = krb5_ap_req.length;
1735                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1736                         **  if (krb5_ap_req.data)  
1737                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1738                         **
1739                         **  Now using real RFC 2712 KerberosWrapper
1740                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1741                         **  Note: 2712 "opaque" types are here replaced
1742                         **  with a 2-byte length followed by the value.
1743                         **  Example:
1744                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1745                         **  Where "xx xx" = length bytes.  Shown here with
1746                         **  optional authenticator omitted.
1747                         */
1748
1749                         /*  KerberosWrapper.Ticket              */
1750                         s2n(enc_ticket->length,p);
1751                         memcpy(p, enc_ticket->data, enc_ticket->length);
1752                         p+= enc_ticket->length;
1753                         n = enc_ticket->length + 2;
1754
1755                         /*  KerberosWrapper.Authenticator       */
1756                         if (authp  &&  authp->length)  
1757                                 {
1758                                 s2n(authp->length,p);
1759                                 memcpy(p, authp->data, authp->length);
1760                                 p+= authp->length;
1761                                 n+= authp->length + 2;
1762                                 
1763                                 free(authp->data);
1764                                 authp->data = NULL;
1765                                 authp->length = 0;
1766                                 }
1767                         else
1768                                 {
1769                                 s2n(0,p);/*  null authenticator length  */
1770                                 n+=2;
1771                                 }
1772  
1773                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1774                             goto err;
1775
1776                         /*  20010420 VRS.  Tried it this way; failed.
1777                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1778                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1779                         **                              kssl_ctx->length);
1780                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1781                         */
1782
1783                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1784                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1785                                 kssl_ctx->key,iv);
1786                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1787                                 sizeof tmp_buf);
1788                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1789                         outl += padl;
1790                         if (outl > sizeof epms)
1791                                 {
1792                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1793                                 goto err;
1794                                 }
1795                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1796
1797                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1798                         s2n(outl,p);
1799                         memcpy(p, epms, outl);
1800                         p+=outl;
1801                         n+=outl + 2;
1802
1803                         s->session->master_key_length=
1804                                 s->method->ssl3_enc->generate_master_secret(s,
1805                                         s->session->master_key,
1806                                         tmp_buf, sizeof tmp_buf);
1807
1808                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1809                         OPENSSL_cleanse(epms, outl);
1810                         }
1811 #endif
1812 #ifndef OPENSSL_NO_DH
1813                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1814                         {
1815                         DH *dh_srvr,*dh_clnt;
1816
1817                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1818                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1819                         else
1820                                 {
1821                                 /* we get them from the cert */
1822                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1823                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1824                                 goto err;
1825                                 }
1826                         
1827                         /* generate a new random key */
1828                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1829                                 {
1830                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1831                                 goto err;
1832                                 }
1833                         if (!DH_generate_key(dh_clnt))
1834                                 {
1835                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1836                                 goto err;
1837                                 }
1838
1839                         /* use the 'p' output buffer for the DH key, but
1840                          * make sure to clear it out afterwards */
1841
1842                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1843
1844                         if (n <= 0)
1845                                 {
1846                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1847                                 goto err;
1848                                 }
1849
1850                         /* generate master key from the result */
1851                         s->session->master_key_length=
1852                                 s->method->ssl3_enc->generate_master_secret(s,
1853                                         s->session->master_key,p,n);
1854                         /* clean up */
1855                         memset(p,0,n);
1856
1857                         /* send off the data */
1858                         n=BN_num_bytes(dh_clnt->pub_key);
1859                         s2n(n,p);
1860                         BN_bn2bin(dh_clnt->pub_key,p);
1861                         n+=2;
1862
1863                         DH_free(dh_clnt);
1864
1865                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1866                         }
1867 #endif
1868
1869 #ifndef OPENSSL_NO_ECDH 
1870                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1871                         {
1872                         EC_GROUP *srvr_group = NULL;
1873                         int ecdh_clnt_cert = 0;
1874                         int field_size = 0;
1875
1876                         /* Did we send out the client's
1877                          * ECDH share for use in premaster
1878                          * computation as part of client certificate?
1879                          * If so, set ecdh_clnt_cert to 1.
1880                          */
1881                         if ((l & SSL_kECDH) && (s->cert != NULL)) 
1882                                 {
1883                                 /* XXX: For now, we do not support client
1884                                  * authentication using ECDH certificates.
1885                                  * To add such support, one needs to add
1886                                  * code that checks for appropriate 
1887                                  * conditions and sets ecdh_clnt_cert to 1.
1888                                  * For example, the cert have an ECC
1889                                  * key on the same curve as the server's
1890                                  * and the key should be authorized for
1891                                  * key agreement.
1892                                  *
1893                                  * One also needs to add code in ssl3_connect
1894                                  * to skip sending the certificate verify
1895                                  * message.
1896                                  *
1897                                  * if ((s->cert->key->privatekey != NULL) &&
1898                                  *     (s->cert->key->privatekey->type ==
1899                                  *      EVP_PKEY_EC) && ...)
1900                                  * ecdh_clnt_cert = 1;
1901                                  */
1902                                 }
1903
1904                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1905                                 {
1906                                 srvr_group = s->session->sess_cert-> \
1907                                     peer_ecdh_tmp->group;
1908                                 srvr_ecpoint = s->session->sess_cert-> \
1909                                     peer_ecdh_tmp->pub_key;
1910                                 }
1911                         else
1912                                 {
1913                                 /* Get the Server Public Key from Cert */
1914                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1915                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1916                                 if ((srvr_pub_pkey == NULL) ||
1917                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1918                                     (srvr_pub_pkey->pkey.eckey == NULL))
1919                                         {
1920                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1921                                             ERR_R_INTERNAL_ERROR);
1922                                         goto err;
1923                                         }
1924
1925                                 srvr_group = srvr_pub_pkey->pkey.eckey->group;
1926                                 srvr_ecpoint = 
1927                                     srvr_pub_pkey->pkey.eckey->pub_key;
1928                                 }
1929
1930                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1931                                 {
1932                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1933                                     ERR_R_INTERNAL_ERROR);
1934                                 goto err;
1935                                 }
1936
1937                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
1938                                 {
1939                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1940                                 goto err;
1941                                 }
1942
1943                         clnt_ecdh->group = srvr_group;
1944                         if (ecdh_clnt_cert) 
1945                                 { 
1946                                 /* Reuse key info from our certificate
1947                                  * We only need our private key to perform
1948                                  * the ECDH computation.
1949                                  */
1950                                 clnt_ecdh->priv_key = BN_dup(s->cert->key-> \
1951                                     privatekey->pkey.eckey->priv_key);
1952                                 }
1953                         else 
1954                                 {
1955                                 /* Generate a new ECDH key pair */
1956                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1957                                         {
1958                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1959                                         goto err;
1960                                         }
1961                                 }
1962
1963                         /* use the 'p' output buffer for the ECDH key, but
1964                          * make sure to clear it out afterwards
1965                          */
1966
1967                         field_size = EC_GROUP_get_degree(clnt_ecdh->group);
1968                         if (field_size <= 0)
1969                                 {
1970                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
1971                                        ERR_R_ECDH_LIB);
1972                                 goto err;
1973                                 }
1974                         /* If field size is not more than 24 octets, then use SHA-1 hash of result;
1975                          * otherwise, use result (see section 4.8 of draft-ietf-tls-ecc-03.txt;
1976                          * this is new with this version of the Internet Draft).
1977                          */
1978                         if (field_size <= 24 * 8)
1979                                 n=ECDH_compute_key(p, KDF1_SHA1_len, srvr_ecpoint, clnt_ecdh, KDF1_SHA1);
1980                         else
1981                                 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1982                         if (n <= 0)
1983                                 {
1984                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 
1985                                        ERR_R_ECDH_LIB);
1986                                 goto err;
1987                                 }
1988
1989                         /* generate master key from the result */
1990                         s->session->master_key_length = s->method->ssl3_enc \
1991                             -> generate_master_secret(s, 
1992                                 s->session->master_key,
1993                                 p, n);
1994
1995                         memset(p, 0, n); /* clean up */
1996
1997                         if (ecdh_clnt_cert) 
1998                                 {
1999                                 /* Send empty client key exch message */
2000                                 n = 0;
2001                                 }
2002                         else 
2003                                 {
2004                                 /* First check the size of encoding and
2005                                  * allocate memory accordingly.
2006                                  */
2007                                 encoded_pt_len = 
2008                                     EC_POINT_point2oct(clnt_ecdh->group, 
2009                                         clnt_ecdh->pub_key, 
2010                                         POINT_CONVERSION_UNCOMPRESSED, 
2011                                         NULL, 0, NULL);
2012
2013                                 encodedPoint = (unsigned char *) 
2014                                     OPENSSL_malloc(encoded_pt_len * 
2015                                         sizeof(unsigned char)); 
2016                                 bn_ctx = BN_CTX_new();
2017                                 if ((encodedPoint == NULL) || 
2018                                     (bn_ctx == NULL)) 
2019                                         {
2020                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2021                                         goto err;
2022                                         }
2023
2024                                 /* Encode the public key */
2025                                 n = EC_POINT_point2oct(clnt_ecdh->group, 
2026                                     clnt_ecdh->pub_key, 
2027                                     POINT_CONVERSION_UNCOMPRESSED, 
2028                                     encodedPoint, encoded_pt_len, bn_ctx);
2029
2030                                 *p = n; /* length of encoded point */
2031                                 /* Encoded point will be copied here */
2032                                 p += 1; 
2033                                 /* copy the point */
2034                                 memcpy((unsigned char *)p, encodedPoint, n);
2035                                 /* increment n to account for length field */
2036                                 n += 1; 
2037                                 }
2038
2039                         /* Free allocated memory */
2040                         BN_CTX_free(bn_ctx);
2041                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2042                         if (clnt_ecdh != NULL) 
2043                                 {
2044                                  /* group is shared */
2045                                  clnt_ecdh->group = NULL; 
2046                                  EC_KEY_free(clnt_ecdh);
2047                                 }
2048                         EVP_PKEY_free(srvr_pub_pkey);
2049                         }
2050 #endif /* !OPENSSL_NO_ECDH */
2051                 else
2052                         {
2053                         ssl3_send_alert(s, SSL3_AL_FATAL,
2054                             SSL_AD_HANDSHAKE_FAILURE);
2055                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2056                             ERR_R_INTERNAL_ERROR);
2057                         goto err;
2058                         }
2059                 
2060                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2061                 l2n3(n,d);
2062
2063                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2064                 /* number of bytes to write */
2065                 s->init_num=n+4;
2066                 s->init_off=0;
2067                 }
2068
2069         /* SSL3_ST_CW_KEY_EXCH_B */
2070         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2071 err:
2072 #ifndef OPENSSL_NO_ECDH
2073         BN_CTX_free(bn_ctx);
2074         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2075         if (clnt_ecdh != NULL) 
2076                 {
2077                 /* group is shared */
2078                 clnt_ecdh->group = NULL; 
2079                 EC_KEY_free(clnt_ecdh);
2080                 }
2081         EVP_PKEY_free(srvr_pub_pkey);
2082 #endif
2083         return(-1);
2084         }
2085
2086 static int ssl3_send_client_verify(SSL *s)
2087         {
2088         unsigned char *p,*d;
2089         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2090         EVP_PKEY *pkey;
2091 #ifndef OPENSSL_NO_RSA
2092         unsigned u=0;
2093 #endif
2094         unsigned long n;
2095 #ifndef OPENSSL_NO_DSA
2096         int j;
2097 #endif
2098
2099         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2100                 {
2101                 d=(unsigned char *)s->init_buf->data;
2102                 p= &(d[4]);
2103                 pkey=s->cert->key->privatekey;
2104
2105                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2106                         &(data[MD5_DIGEST_LENGTH]));
2107
2108 #ifndef OPENSSL_NO_RSA
2109                 if (pkey->type == EVP_PKEY_RSA)
2110                         {
2111                         s->method->ssl3_enc->cert_verify_mac(s,
2112                                 &(s->s3->finish_dgst1),&(data[0]));
2113                         if (RSA_sign(NID_md5_sha1, data,
2114                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2115                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2116                                 {
2117                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2118                                 goto err;
2119                                 }
2120                         s2n(u,p);
2121                         n=u+2;
2122                         }
2123                 else
2124 #endif
2125 #ifndef OPENSSL_NO_DSA
2126                         if (pkey->type == EVP_PKEY_DSA)
2127                         {
2128                         if (!DSA_sign(pkey->save_type,
2129                                 &(data[MD5_DIGEST_LENGTH]),
2130                                 SHA_DIGEST_LENGTH,&(p[2]),
2131                                 (unsigned int *)&j,pkey->pkey.dsa))
2132                                 {
2133                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2134                                 goto err;
2135                                 }
2136                         s2n(j,p);
2137                         n=j+2;
2138                         }
2139                 else
2140 #endif
2141 #ifndef OPENSSL_NO_ECDSA
2142                         if (pkey->type == EVP_PKEY_EC)
2143                         {
2144                         if (!ECDSA_sign(pkey->save_type,
2145                                 &(data[MD5_DIGEST_LENGTH]),
2146                                 SHA_DIGEST_LENGTH,&(p[2]),
2147                                 (unsigned int *)&j,pkey->pkey.eckey))
2148                                 {
2149                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2150                                     ERR_R_ECDSA_LIB);
2151                                 goto err;
2152                                 }
2153                         s2n(j,p);
2154                         n=j+2;
2155                         }
2156                 else
2157 #endif
2158                         {
2159                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2160                         goto err;
2161                         }
2162                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2163                 l2n3(n,d);
2164
2165                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2166                 s->init_num=(int)n+4;
2167                 s->init_off=0;
2168                 }
2169         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2170 err:
2171         return(-1);
2172         }
2173
2174 static int ssl3_send_client_certificate(SSL *s)
2175         {
2176         X509 *x509=NULL;
2177         EVP_PKEY *pkey=NULL;
2178         int i;
2179         unsigned long l;
2180
2181         if (s->state == SSL3_ST_CW_CERT_A)
2182                 {
2183                 if ((s->cert == NULL) ||
2184                         (s->cert->key->x509 == NULL) ||
2185                         (s->cert->key->privatekey == NULL))
2186                         s->state=SSL3_ST_CW_CERT_B;
2187                 else
2188                         s->state=SSL3_ST_CW_CERT_C;
2189                 }
2190
2191         /* We need to get a client cert */
2192         if (s->state == SSL3_ST_CW_CERT_B)
2193                 {
2194                 /* If we get an error, we need to
2195                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2196                  * We then get retied later */
2197                 i=0;
2198                 if (s->ctx->client_cert_cb != NULL)
2199                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
2200                 if (i < 0)
2201                         {
2202                         s->rwstate=SSL_X509_LOOKUP;
2203                         return(-1);
2204                         }
2205                 s->rwstate=SSL_NOTHING;
2206                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2207                         {
2208                         s->state=SSL3_ST_CW_CERT_B;
2209                         if (    !SSL_use_certificate(s,x509) ||
2210                                 !SSL_use_PrivateKey(s,pkey))
2211                                 i=0;
2212                         }
2213                 else if (i == 1)
2214                         {
2215                         i=0;
2216                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2217                         }
2218
2219                 if (x509 != NULL) X509_free(x509);
2220                 if (pkey != NULL) EVP_PKEY_free(pkey);
2221                 if (i == 0)
2222                         {
2223                         if (s->version == SSL3_VERSION)
2224                                 {
2225                                 s->s3->tmp.cert_req=0;
2226                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2227                                 return(1);
2228                                 }
2229                         else
2230                                 {
2231                                 s->s3->tmp.cert_req=2;
2232                                 }
2233                         }
2234
2235                 /* Ok, we have a cert */
2236                 s->state=SSL3_ST_CW_CERT_C;
2237                 }
2238
2239         if (s->state == SSL3_ST_CW_CERT_C)
2240                 {
2241                 s->state=SSL3_ST_CW_CERT_D;
2242                 l=ssl3_output_cert_chain(s,
2243                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2244                 s->init_num=(int)l;
2245                 s->init_off=0;
2246                 }
2247         /* SSL3_ST_CW_CERT_D */
2248         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2249         }
2250
2251 #define has_bits(i,m)   (((i)&(m)) == (m))
2252
2253 static int ssl3_check_cert_and_algorithm(SSL *s)
2254         {
2255         int i,idx;
2256         long algs;
2257         EVP_PKEY *pkey=NULL;
2258         SESS_CERT *sc;
2259 #ifndef OPENSSL_NO_RSA
2260         RSA *rsa;
2261 #endif
2262 #ifndef OPENSSL_NO_DH
2263         DH *dh;
2264 #endif
2265
2266         sc=s->session->sess_cert;
2267
2268         if (sc == NULL)
2269                 {
2270                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2271                 goto err;
2272                 }
2273
2274         algs=s->s3->tmp.new_cipher->algorithms;
2275
2276         /* we don't have a certificate */
2277         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2278                 return(1);
2279
2280 #ifndef OPENSSL_NO_RSA
2281         rsa=s->session->sess_cert->peer_rsa_tmp;
2282 #endif
2283 #ifndef OPENSSL_NO_DH
2284         dh=s->session->sess_cert->peer_dh_tmp;
2285 #endif
2286
2287         /* This is the passed certificate */
2288
2289         idx=sc->peer_cert_type;
2290 #ifndef OPENSSL_NO_ECDH
2291         if (idx == SSL_PKEY_ECC)
2292                 {
2293                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2294                     s->s3->tmp.new_cipher) == 0) 
2295                         { /* check failed */
2296                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2297                         goto f_err;                     
2298                         }
2299                 else 
2300                         {
2301                         return 1;
2302                         }
2303                 }
2304 #endif
2305         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2306         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2307         EVP_PKEY_free(pkey);
2308
2309         
2310         /* Check that we have a certificate if we require one */
2311         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2312                 {
2313                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2314                 goto f_err;
2315                 }
2316 #ifndef OPENSSL_NO_DSA
2317         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2318                 {
2319                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2320                 goto f_err;
2321                 }
2322 #endif
2323 #ifndef OPENSSL_NO_RSA
2324         if ((algs & SSL_kRSA) &&
2325                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2326                 {
2327                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2328                 goto f_err;
2329                 }
2330 #endif
2331 #ifndef OPENSSL_NO_DH
2332         if ((algs & SSL_kEDH) &&
2333                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2334                 {
2335                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2336                 goto f_err;
2337                 }
2338         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2339                 {
2340                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2341                 goto f_err;
2342                 }
2343 #ifndef OPENSSL_NO_DSA
2344         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2345                 {
2346                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2347                 goto f_err;
2348                 }
2349 #endif
2350 #endif
2351
2352         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2353                 {
2354 #ifndef OPENSSL_NO_RSA
2355                 if (algs & SSL_kRSA)
2356                         {
2357                         if (rsa == NULL
2358                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2359                                 {
2360                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2361                                 goto f_err;
2362                                 }
2363                         }
2364                 else
2365 #endif
2366 #ifndef OPENSSL_NO_DH
2367                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2368                             {
2369                             if (dh == NULL
2370                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2371                                 {
2372                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2373                                 goto f_err;
2374                                 }
2375                         }
2376                 else
2377 #endif
2378                         {
2379                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2380                         goto f_err;
2381                         }
2382                 }
2383         return(1);
2384 f_err:
2385         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2386 err:
2387         return(0);
2388         }
2389
2390
2391 #ifndef OPENSSL_NO_ECDH
2392 /* This is the complement of nid2curve_id in s3_srvr.c. */
2393 static int curve_id2nid(int curve_id)
2394 {
2395         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2396          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2397         static int nid_list[26] =
2398         {
2399                 0,
2400                 NID_sect163k1, /* sect163k1 (1) */
2401                 NID_sect163r1, /* sect163r1 (2) */
2402                 NID_sect163r2, /* sect163r2 (3) */
2403                 NID_sect193r1, /* sect193r1 (4) */ 
2404                 NID_sect193r2, /* sect193r2 (5) */ 
2405                 NID_sect233k1, /* sect233k1 (6) */
2406                 NID_sect233r1, /* sect233r1 (7) */ 
2407                 NID_sect239k1, /* sect239k1 (8) */ 
2408                 NID_sect283k1, /* sect283k1 (9) */
2409                 NID_sect283r1, /* sect283r1 (10) */ 
2410                 NID_sect409k1, /* sect409k1 (11) */ 
2411                 NID_sect409r1, /* sect409r1 (12) */
2412                 NID_sect571k1, /* sect571k1 (13) */ 
2413                 NID_sect571r1, /* sect571r1 (14) */ 
2414                 NID_secp160k1, /* secp160k1 (15) */
2415                 NID_secp160r1, /* secp160r1 (16) */ 
2416                 NID_secp160r2, /* secp160r2 (17) */ 
2417                 NID_secp192k1, /* secp192k1 (18) */
2418                 NID_X9_62_prime192v1, /* secp192r1 (19) */ 
2419                 NID_secp224k1, /* secp224k1 (20) */ 
2420                 NID_secp224r1, /* secp224r1 (21) */
2421                 NID_secp256k1, /* secp256k1 (22) */ 
2422                 NID_X9_62_prime256v1, /* secp256r1 (23) */ 
2423                 NID_secp384r1, /* secp384r1 (24) */
2424                 NID_secp521r1  /* secp521r1 (25) */     
2425         };
2426         
2427         if ((curve_id < 1) || (curve_id > 25)) return 0;
2428
2429         return nid_list[curve_id];
2430 }
2431 #endif