get rid of OpenSSLDie
[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) 1998-2002 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 #include <stdio.h>
113 #include "ssl_locl.h"
114 #include "kssl_lcl.h"
115 #include <openssl/buffer.h>
116 #include <openssl/rand.h>
117 #include <openssl/objects.h>
118 #include <openssl/evp.h>
119 #include <openssl/md5.h>
120 #include "cryptlib.h"
121
122 static SSL_METHOD *ssl3_get_client_method(int ver);
123 static int ssl3_client_hello(SSL *s);
124 static int ssl3_get_server_hello(SSL *s);
125 static int ssl3_get_certificate_request(SSL *s);
126 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
127 static int ssl3_get_server_done(SSL *s);
128 static int ssl3_send_client_verify(SSL *s);
129 static int ssl3_send_client_certificate(SSL *s);
130 static int ssl3_send_client_key_exchange(SSL *s);
131 static int ssl3_get_key_exchange(SSL *s);
132 static int ssl3_get_server_certificate(SSL *s);
133 static int ssl3_check_cert_and_algorithm(SSL *s);
134 static SSL_METHOD *ssl3_get_client_method(int ver)
135         {
136         if (ver == SSL3_VERSION)
137                 return(SSLv3_client_method());
138         else
139                 return(NULL);
140         }
141
142 SSL_METHOD *SSLv3_client_method(void)
143         {
144         static int init=1;
145         static SSL_METHOD SSLv3_client_data;
146
147         if (init)
148                 {
149                 init=0;
150                 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
151                         sizeof(SSL_METHOD));
152                 SSLv3_client_data.ssl_connect=ssl3_connect;
153                 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
154                 }
155         return(&SSLv3_client_data);
156         }
157
158 int ssl3_connect(SSL *s)
159         {
160         BUF_MEM *buf;
161         unsigned long Time=time(NULL),l;
162         long num1;
163         void (*cb)(const SSL *ssl,int type,int val)=NULL;
164         int ret= -1;
165         int new_state,state,skip=0;;
166
167         RAND_add(&Time,sizeof(Time),0);
168         ERR_clear_error();
169         clear_sys_error();
170
171         if (s->info_callback != NULL)
172                 cb=s->info_callback;
173         else if (s->ctx->info_callback != NULL)
174                 cb=s->ctx->info_callback;
175         
176         s->in_handshake++;
177         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
178
179         for (;;)
180                 {
181                 state=s->state;
182
183                 switch(s->state)
184                         {
185                 case SSL_ST_RENEGOTIATE:
186                         s->new_session=1;
187                         s->state=SSL_ST_CONNECT;
188                         s->ctx->stats.sess_connect_renegotiate++;
189                         /* break */
190                 case SSL_ST_BEFORE:
191                 case SSL_ST_CONNECT:
192                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
193                 case SSL_ST_OK|SSL_ST_CONNECT:
194
195                         s->server=0;
196                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
197
198                         if ((s->version & 0xff00 ) != 0x0300)
199                                 {
200                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
201                                 ret = -1;
202                                 goto end;
203                                 }
204                                 
205                         /* s->version=SSL3_VERSION; */
206                         s->type=SSL_ST_CONNECT;
207
208                         if (s->init_buf == NULL)
209                                 {
210                                 if ((buf=BUF_MEM_new()) == NULL)
211                                         {
212                                         ret= -1;
213                                         goto end;
214                                         }
215                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
216                                         {
217                                         ret= -1;
218                                         goto end;
219                                         }
220                                 s->init_buf=buf;
221                                 }
222
223                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
224
225                         /* setup buffing BIO */
226                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
227
228                         /* don't push the buffering BIO quite yet */
229
230                         ssl3_init_finished_mac(s);
231
232                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
233                         s->ctx->stats.sess_connect++;
234                         s->init_num=0;
235                         break;
236
237                 case SSL3_ST_CW_CLNT_HELLO_A:
238                 case SSL3_ST_CW_CLNT_HELLO_B:
239
240                         s->shutdown=0;
241                         ret=ssl3_client_hello(s);
242                         if (ret <= 0) goto end;
243                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
244                         s->init_num=0;
245
246                         /* turn on buffering for the next lot of output */
247                         if (s->bbio != s->wbio)
248                                 s->wbio=BIO_push(s->bbio,s->wbio);
249
250                         break;
251
252                 case SSL3_ST_CR_SRVR_HELLO_A:
253                 case SSL3_ST_CR_SRVR_HELLO_B:
254                         ret=ssl3_get_server_hello(s);
255                         if (ret <= 0) goto end;
256                         if (s->hit)
257                                 s->state=SSL3_ST_CR_FINISHED_A;
258                         else
259                                 s->state=SSL3_ST_CR_CERT_A;
260                         s->init_num=0;
261                         break;
262
263                 case SSL3_ST_CR_CERT_A:
264                 case SSL3_ST_CR_CERT_B:
265                         /* Check if it is anon DH */
266                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
267                                 {
268                                 ret=ssl3_get_server_certificate(s);
269                                 if (ret <= 0) goto end;
270                                 }
271                         else
272                                 skip=1;
273                         s->state=SSL3_ST_CR_KEY_EXCH_A;
274                         s->init_num=0;
275                         break;
276
277                 case SSL3_ST_CR_KEY_EXCH_A:
278                 case SSL3_ST_CR_KEY_EXCH_B:
279                         ret=ssl3_get_key_exchange(s);
280                         if (ret <= 0) goto end;
281                         s->state=SSL3_ST_CR_CERT_REQ_A;
282                         s->init_num=0;
283
284                         /* at this point we check that we have the
285                          * required stuff from the server */
286                         if (!ssl3_check_cert_and_algorithm(s))
287                                 {
288                                 ret= -1;
289                                 goto end;
290                                 }
291                         break;
292
293                 case SSL3_ST_CR_CERT_REQ_A:
294                 case SSL3_ST_CR_CERT_REQ_B:
295                         ret=ssl3_get_certificate_request(s);
296                         if (ret <= 0) goto end;
297                         s->state=SSL3_ST_CR_SRVR_DONE_A;
298                         s->init_num=0;
299                         break;
300
301                 case SSL3_ST_CR_SRVR_DONE_A:
302                 case SSL3_ST_CR_SRVR_DONE_B:
303                         ret=ssl3_get_server_done(s);
304                         if (ret <= 0) goto end;
305                         if (s->s3->tmp.cert_req)
306                                 s->state=SSL3_ST_CW_CERT_A;
307                         else
308                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
309                         s->init_num=0;
310
311                         break;
312
313                 case SSL3_ST_CW_CERT_A:
314                 case SSL3_ST_CW_CERT_B:
315                 case SSL3_ST_CW_CERT_C:
316                 case SSL3_ST_CW_CERT_D:
317                         ret=ssl3_send_client_certificate(s);
318                         if (ret <= 0) goto end;
319                         s->state=SSL3_ST_CW_KEY_EXCH_A;
320                         s->init_num=0;
321                         break;
322
323                 case SSL3_ST_CW_KEY_EXCH_A:
324                 case SSL3_ST_CW_KEY_EXCH_B:
325                         ret=ssl3_send_client_key_exchange(s);
326                         if (ret <= 0) goto end;
327                         l=s->s3->tmp.new_cipher->algorithms;
328                         /* EAY EAY EAY need to check for DH fix cert
329                          * sent back */
330                         /* For TLS, cert_req is set to 2, so a cert chain
331                          * of nothing is sent, but no verify packet is sent */
332                         if (s->s3->tmp.cert_req == 1)
333                                 {
334                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
335                                 }
336                         else
337                                 {
338                                 s->state=SSL3_ST_CW_CHANGE_A;
339                                 s->s3->change_cipher_spec=0;
340                                 }
341
342                         s->init_num=0;
343                         break;
344
345                 case SSL3_ST_CW_CERT_VRFY_A:
346                 case SSL3_ST_CW_CERT_VRFY_B:
347                         ret=ssl3_send_client_verify(s);
348                         if (ret <= 0) goto end;
349                         s->state=SSL3_ST_CW_CHANGE_A;
350                         s->init_num=0;
351                         s->s3->change_cipher_spec=0;
352                         break;
353
354                 case SSL3_ST_CW_CHANGE_A:
355                 case SSL3_ST_CW_CHANGE_B:
356                         ret=ssl3_send_change_cipher_spec(s,
357                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
358                         if (ret <= 0) goto end;
359                         s->state=SSL3_ST_CW_FINISHED_A;
360                         s->init_num=0;
361
362                         s->session->cipher=s->s3->tmp.new_cipher;
363                         if (s->s3->tmp.new_compression == NULL)
364                                 s->session->compress_meth=0;
365                         else
366                                 s->session->compress_meth=
367                                         s->s3->tmp.new_compression->id;
368                         if (!s->method->ssl3_enc->setup_key_block(s))
369                                 {
370                                 ret= -1;
371                                 goto end;
372                                 }
373
374                         if (!s->method->ssl3_enc->change_cipher_state(s,
375                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
376                                 {
377                                 ret= -1;
378                                 goto end;
379                                 }
380
381                         break;
382
383                 case SSL3_ST_CW_FINISHED_A:
384                 case SSL3_ST_CW_FINISHED_B:
385                         ret=ssl3_send_finished(s,
386                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
387                                 s->method->ssl3_enc->client_finished_label,
388                                 s->method->ssl3_enc->client_finished_label_len);
389                         if (ret <= 0) goto end;
390                         s->state=SSL3_ST_CW_FLUSH;
391
392                         /* clear flags */
393                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
394                         if (s->hit)
395                                 {
396                                 s->s3->tmp.next_state=SSL_ST_OK;
397                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
398                                         {
399                                         s->state=SSL_ST_OK;
400                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
401                                         s->s3->delay_buf_pop_ret=0;
402                                         }
403                                 }
404                         else
405                                 {
406                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
407                                 }
408                         s->init_num=0;
409                         break;
410
411                 case SSL3_ST_CR_FINISHED_A:
412                 case SSL3_ST_CR_FINISHED_B:
413
414                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
415                                 SSL3_ST_CR_FINISHED_B);
416                         if (ret <= 0) goto end;
417
418                         if (s->hit)
419                                 s->state=SSL3_ST_CW_CHANGE_A;
420                         else
421                                 s->state=SSL_ST_OK;
422                         s->init_num=0;
423                         break;
424
425                 case SSL3_ST_CW_FLUSH:
426                         /* number of bytes to be flushed */
427                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
428                         if (num1 > 0)
429                                 {
430                                 s->rwstate=SSL_WRITING;
431                                 num1=BIO_flush(s->wbio);
432                                 if (num1 <= 0) { ret= -1; goto end; }
433                                 s->rwstate=SSL_NOTHING;
434                                 }
435
436                         s->state=s->s3->tmp.next_state;
437                         break;
438
439                 case SSL_ST_OK:
440                         /* clean a few things up */
441                         ssl3_cleanup_key_block(s);
442
443                         if (s->init_buf != NULL)
444                                 {
445                                 BUF_MEM_free(s->init_buf);
446                                 s->init_buf=NULL;
447                                 }
448
449                         /* If we are not 'joining' the last two packets,
450                          * remove the buffering now */
451                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
452                                 ssl_free_wbio_buffer(s);
453                         /* else do it later in ssl3_write */
454
455                         s->init_num=0;
456                         s->new_session=0;
457
458                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
459                         if (s->hit) s->ctx->stats.sess_hit++;
460
461                         ret=1;
462                         /* s->server=0; */
463                         s->handshake_func=ssl3_connect;
464                         s->ctx->stats.sess_connect_good++;
465
466                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
467
468                         goto end;
469                         /* break; */
470                         
471                 default:
472                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
473                         ret= -1;
474                         goto end;
475                         /* break; */
476                         }
477
478                 /* did we do anything */
479                 if (!s->s3->tmp.reuse_message && !skip)
480                         {
481                         if (s->debug)
482                                 {
483                                 if ((ret=BIO_flush(s->wbio)) <= 0)
484                                         goto end;
485                                 }
486
487                         if ((cb != NULL) && (s->state != state))
488                                 {
489                                 new_state=s->state;
490                                 s->state=state;
491                                 cb(s,SSL_CB_CONNECT_LOOP,1);
492                                 s->state=new_state;
493                                 }
494                         }
495                 skip=0;
496                 }
497 end:
498         s->in_handshake--;
499         if (cb != NULL)
500                 cb(s,SSL_CB_CONNECT_EXIT,ret);
501         return(ret);
502         }
503
504
505 static int ssl3_client_hello(SSL *s)
506         {
507         unsigned char *buf;
508         unsigned char *p,*d;
509         int i,j;
510         unsigned long Time,l;
511         SSL_COMP *comp;
512
513         buf=(unsigned char *)s->init_buf->data;
514         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
515                 {
516                 if ((s->session == NULL) ||
517                         (s->session->ssl_version != s->version) ||
518                         (s->session->not_resumable))
519                         {
520                         if (!ssl_get_new_session(s,0))
521                                 goto err;
522                         }
523                 /* else use the pre-loaded session */
524
525                 p=s->s3->client_random;
526                 Time=time(NULL);                        /* Time */
527                 l2n(Time,p);
528                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
529
530                 /* Do the message type and length last */
531                 d=p= &(buf[4]);
532
533                 *(p++)=s->version>>8;
534                 *(p++)=s->version&0xff;
535                 s->client_version=s->version;
536
537                 /* Random stuff */
538                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
539                 p+=SSL3_RANDOM_SIZE;
540
541                 /* Session ID */
542                 if (s->new_session)
543                         i=0;
544                 else
545                         i=s->session->session_id_length;
546                 *(p++)=i;
547                 if (i != 0)
548                         {
549                         if (i > sizeof s->session->session_id)
550                                 {
551                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
552                                 goto err;
553                                 }
554                         memcpy(p,s->session->session_id,i);
555                         p+=i;
556                         }
557                 
558                 /* Ciphers supported */
559                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
560                 if (i == 0)
561                         {
562                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
563                         goto err;
564                         }
565                 s2n(i,p);
566                 p+=i;
567
568                 /* COMPRESSION */
569                 if (s->ctx->comp_methods == NULL)
570                         j=0;
571                 else
572                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
573                 *(p++)=1+j;
574                 for (i=0; i<j; i++)
575                         {
576                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
577                         *(p++)=comp->id;
578                         }
579                 *(p++)=0; /* Add the NULL method */
580                 
581                 l=(p-d);
582                 d=buf;
583                 *(d++)=SSL3_MT_CLIENT_HELLO;
584                 l2n3(l,d);
585
586                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
587                 /* number of bytes to write */
588                 s->init_num=p-buf;
589                 s->init_off=0;
590                 }
591
592         /* SSL3_ST_CW_CLNT_HELLO_B */
593         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
594 err:
595         return(-1);
596         }
597
598 static int ssl3_get_server_hello(SSL *s)
599         {
600         STACK_OF(SSL_CIPHER) *sk;
601         SSL_CIPHER *c;
602         unsigned char *p,*d;
603         int i,al,ok;
604         unsigned int j;
605         long n;
606         SSL_COMP *comp;
607
608         n=ssl3_get_message(s,
609                 SSL3_ST_CR_SRVR_HELLO_A,
610                 SSL3_ST_CR_SRVR_HELLO_B,
611                 SSL3_MT_SERVER_HELLO,
612                 300, /* ?? */
613                 &ok);
614
615         if (!ok) return((int)n);
616         d=p=(unsigned char *)s->init_msg;
617
618         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
619                 {
620                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
621                 s->version=(s->version&0xff00)|p[1];
622                 al=SSL_AD_PROTOCOL_VERSION;
623                 goto f_err;
624                 }
625         p+=2;
626
627         /* load the server hello data */
628         /* load the server random */
629         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
630         p+=SSL3_RANDOM_SIZE;
631
632         /* get the session-id */
633         j= *(p++);
634
635        if(j > sizeof s->session->session_id)
636                {
637                al=SSL_AD_ILLEGAL_PARAMETER;
638                SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,
639                       SSL_R_SSL3_SESSION_ID_TOO_LONG);
640                goto f_err;
641                }
642
643         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
644                 {
645                 /* SSLref returns 16 :-( */
646                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
647                         {
648                         al=SSL_AD_ILLEGAL_PARAMETER;
649                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
650                         goto f_err;
651                         }
652                 }
653         if (j != 0 && j == s->session->session_id_length
654             && memcmp(p,s->session->session_id,j) == 0)
655             {
656             if(s->sid_ctx_length != s->session->sid_ctx_length
657                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
658                 {
659                 al=SSL_AD_ILLEGAL_PARAMETER;
660                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
661                 goto f_err;
662                 }
663             s->hit=1;
664             }
665         else    /* a miss or crap from the other end */
666                 {
667                 /* If we were trying for session-id reuse, make a new
668                  * SSL_SESSION so we don't stuff up other people */
669                 s->hit=0;
670                 if (s->session->session_id_length > 0)
671                         {
672                         if (!ssl_get_new_session(s,0))
673                                 {
674                                 al=SSL_AD_INTERNAL_ERROR;
675                                 goto f_err;
676                                 }
677                         }
678                 s->session->session_id_length=j;
679                 memcpy(s->session->session_id,p,j); /* j could be 0 */
680                 }
681         p+=j;
682         c=ssl_get_cipher_by_char(s,p);
683         if (c == NULL)
684                 {
685                 /* unknown cipher */
686                 al=SSL_AD_ILLEGAL_PARAMETER;
687                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
688                 goto f_err;
689                 }
690         p+=ssl_put_cipher_by_char(s,NULL,NULL);
691
692         sk=ssl_get_ciphers_by_id(s);
693         i=sk_SSL_CIPHER_find(sk,c);
694         if (i < 0)
695                 {
696                 /* we did not say we would use this cipher */
697                 al=SSL_AD_ILLEGAL_PARAMETER;
698                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
699                 goto f_err;
700                 }
701
702         if (s->hit && (s->session->cipher != c))
703                 {
704                 if (!(s->options &
705                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
706                         {
707                         al=SSL_AD_ILLEGAL_PARAMETER;
708                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
709                         goto f_err;
710                         }
711                 }
712         s->s3->tmp.new_cipher=c;
713
714         /* lets get the compression algorithm */
715         /* COMPRESSION */
716         j= *(p++);
717         if (j == 0)
718                 comp=NULL;
719         else
720                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
721         
722         if ((j != 0) && (comp == NULL))
723                 {
724                 al=SSL_AD_ILLEGAL_PARAMETER;
725                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
726                 goto f_err;
727                 }
728         else
729                 {
730                 s->s3->tmp.new_compression=comp;
731                 }
732
733         if (p != (d+n))
734                 {
735                 /* wrong packet length */
736                 al=SSL_AD_DECODE_ERROR;
737                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
738                 goto err;
739                 }
740
741         return(1);
742 f_err:
743         ssl3_send_alert(s,SSL3_AL_FATAL,al);
744 err:
745         return(-1);
746         }
747
748 static int ssl3_get_server_certificate(SSL *s)
749         {
750         int al,i,ok,ret= -1;
751         unsigned long n,nc,llen,l;
752         X509 *x=NULL;
753         unsigned char *p,*d,*q;
754         STACK_OF(X509) *sk=NULL;
755         SESS_CERT *sc;
756         EVP_PKEY *pkey=NULL;
757         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
758
759         n=ssl3_get_message(s,
760                 SSL3_ST_CR_CERT_A,
761                 SSL3_ST_CR_CERT_B,
762                 -1,
763                 s->max_cert_list,
764                 &ok);
765
766         if (!ok) return((int)n);
767
768         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
769                 {
770                 s->s3->tmp.reuse_message=1;
771                 return(1);
772                 }
773
774         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
775                 {
776                 al=SSL_AD_UNEXPECTED_MESSAGE;
777                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
778                 goto f_err;
779                 }
780         d=p=(unsigned char *)s->init_msg;
781
782         if ((sk=sk_X509_new_null()) == NULL)
783                 {
784                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
785                 goto err;
786                 }
787
788         n2l3(p,llen);
789         if (llen+3 != n)
790                 {
791                 al=SSL_AD_DECODE_ERROR;
792                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
793                 goto f_err;
794                 }
795         for (nc=0; nc<llen; )
796                 {
797                 n2l3(p,l);
798                 if ((l+nc+3) > llen)
799                         {
800                         al=SSL_AD_DECODE_ERROR;
801                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
802                         goto f_err;
803                         }
804
805                 q=p;
806                 x=d2i_X509(NULL,&q,l);
807                 if (x == NULL)
808                         {
809                         al=SSL_AD_BAD_CERTIFICATE;
810                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
811                         goto f_err;
812                         }
813                 if (q != (p+l))
814                         {
815                         al=SSL_AD_DECODE_ERROR;
816                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
817                         goto f_err;
818                         }
819                 if (!sk_X509_push(sk,x))
820                         {
821                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
822                         goto err;
823                         }
824                 x=NULL;
825                 nc+=l+3;
826                 p=q;
827                 }
828
829         i=ssl_verify_cert_chain(s,sk);
830         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
831 #ifndef OPENSSL_NO_KRB5
832                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
833                 != (SSL_aKRB5|SSL_kKRB5)
834 #endif /* OPENSSL_NO_KRB5 */
835                 )
836                 {
837                 al=ssl_verify_alarm_type(s->verify_result);
838                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
839                 goto f_err; 
840                 }
841         ERR_clear_error(); /* but we keep s->verify_result */
842
843         sc=ssl_sess_cert_new();
844         if (sc == NULL) goto err;
845
846         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
847         s->session->sess_cert=sc;
848
849         sc->cert_chain=sk;
850         /* Inconsistency alert: cert_chain does include the peer's
851          * certificate, which we don't include in s3_srvr.c */
852         x=sk_X509_value(sk,0);
853         sk=NULL;
854         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
855
856         pkey=X509_get_pubkey(x);
857
858         /* VRS: allow null cert if auth == KRB5 */
859         need_cert =     ((s->s3->tmp.new_cipher->algorithms
860                         & (SSL_MKEY_MASK|SSL_AUTH_MASK))
861                         == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
862
863 #ifdef KSSL_DEBUG
864         printf("pkey,x = %p, %p\n", pkey,x);
865         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
866         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
867                 s->s3->tmp.new_cipher->algorithms, need_cert);
868 #endif    /* KSSL_DEBUG */
869
870         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
871                 {
872                 x=NULL;
873                 al=SSL3_AL_FATAL;
874                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
875                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
876                 goto f_err;
877                 }
878
879         i=ssl_cert_type(x,pkey);
880         if (need_cert && i < 0)
881                 {
882                 x=NULL;
883                 al=SSL3_AL_FATAL;
884                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
885                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
886                 goto f_err;
887                 }
888
889         if (need_cert)
890                 {
891                 sc->peer_cert_type=i;
892                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
893                 /* Why would the following ever happen?
894                  * We just created sc a couple of lines ago. */
895                 if (sc->peer_pkeys[i].x509 != NULL)
896                         X509_free(sc->peer_pkeys[i].x509);
897                 sc->peer_pkeys[i].x509=x;
898                 sc->peer_key= &(sc->peer_pkeys[i]);
899
900                 if (s->session->peer != NULL)
901                         X509_free(s->session->peer);
902                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
903                 s->session->peer=x;
904                 }
905         else
906                 {
907                 sc->peer_cert_type=i;
908                 sc->peer_key= NULL;
909
910                 if (s->session->peer != NULL)
911                         X509_free(s->session->peer);
912                 s->session->peer=NULL;
913                 }
914         s->session->verify_result = s->verify_result;
915
916         x=NULL;
917         ret=1;
918
919         if (0)
920                 {
921 f_err:
922                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
923                 }
924 err:
925         EVP_PKEY_free(pkey);
926         X509_free(x);
927         sk_X509_pop_free(sk,X509_free);
928         return(ret);
929         }
930
931 static int ssl3_get_key_exchange(SSL *s)
932         {
933 #ifndef OPENSSL_NO_RSA
934         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
935 #endif
936         EVP_MD_CTX md_ctx;
937         unsigned char *param,*p;
938         int al,i,j,param_len,ok;
939         long n,alg;
940         EVP_PKEY *pkey=NULL;
941 #ifndef OPENSSL_NO_RSA
942         RSA *rsa=NULL;
943 #endif
944 #ifndef OPENSSL_NO_DH
945         DH *dh=NULL;
946 #endif
947
948         /* use same message size as in ssl3_get_certificate_request()
949          * as ServerKeyExchange message may be skipped */
950         n=ssl3_get_message(s,
951                 SSL3_ST_CR_KEY_EXCH_A,
952                 SSL3_ST_CR_KEY_EXCH_B,
953                 -1,
954                 s->max_cert_list,
955                 &ok);
956
957         if (!ok) return((int)n);
958
959         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
960                 {
961                 s->s3->tmp.reuse_message=1;
962                 return(1);
963                 }
964
965         param=p=(unsigned char *)s->init_msg;
966
967         if (s->session->sess_cert != NULL)
968                 {
969 #ifndef OPENSSL_NO_RSA
970                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
971                         {
972                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
973                         s->session->sess_cert->peer_rsa_tmp=NULL;
974                         }
975 #endif
976 #ifndef OPENSSL_NO_DH
977                 if (s->session->sess_cert->peer_dh_tmp)
978                         {
979                         DH_free(s->session->sess_cert->peer_dh_tmp);
980                         s->session->sess_cert->peer_dh_tmp=NULL;
981                         }
982 #endif
983                 }
984         else
985                 {
986                 s->session->sess_cert=ssl_sess_cert_new();
987                 }
988
989         param_len=0;
990         alg=s->s3->tmp.new_cipher->algorithms;
991         EVP_MD_CTX_init(&md_ctx);
992
993 #ifndef OPENSSL_NO_RSA
994         if (alg & SSL_kRSA)
995                 {
996                 if ((rsa=RSA_new()) == NULL)
997                         {
998                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
999                         goto err;
1000                         }
1001                 n2s(p,i);
1002                 param_len=i+2;
1003                 if (param_len > n)
1004                         {
1005                         al=SSL_AD_DECODE_ERROR;
1006                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1007                         goto f_err;
1008                         }
1009                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1010                         {
1011                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1012                         goto err;
1013                         }
1014                 p+=i;
1015
1016                 n2s(p,i);
1017                 param_len+=i+2;
1018                 if (param_len > n)
1019                         {
1020                         al=SSL_AD_DECODE_ERROR;
1021                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1022                         goto f_err;
1023                         }
1024                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1025                         {
1026                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1027                         goto err;
1028                         }
1029                 p+=i;
1030                 n-=param_len;
1031
1032                 /* this should be because we are using an export cipher */
1033                 if (alg & SSL_aRSA)
1034                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1035                 else
1036                         {
1037                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1038                         goto err;
1039                         }
1040                 s->session->sess_cert->peer_rsa_tmp=rsa;
1041                 rsa=NULL;
1042                 }
1043 #else /* OPENSSL_NO_RSA */
1044         if (0)
1045                 ;
1046 #endif
1047 #ifndef OPENSSL_NO_DH
1048         else if (alg & SSL_kEDH)
1049                 {
1050                 if ((dh=DH_new()) == NULL)
1051                         {
1052                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1053                         goto err;
1054                         }
1055                 n2s(p,i);
1056                 param_len=i+2;
1057                 if (param_len > n)
1058                         {
1059                         al=SSL_AD_DECODE_ERROR;
1060                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1061                         goto f_err;
1062                         }
1063                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1064                         {
1065                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1066                         goto err;
1067                         }
1068                 p+=i;
1069
1070                 n2s(p,i);
1071                 param_len+=i+2;
1072                 if (param_len > n)
1073                         {
1074                         al=SSL_AD_DECODE_ERROR;
1075                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1076                         goto f_err;
1077                         }
1078                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1079                         {
1080                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1081                         goto err;
1082                         }
1083                 p+=i;
1084
1085                 n2s(p,i);
1086                 param_len+=i+2;
1087                 if (param_len > n)
1088                         {
1089                         al=SSL_AD_DECODE_ERROR;
1090                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1091                         goto f_err;
1092                         }
1093                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1094                         {
1095                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1096                         goto err;
1097                         }
1098                 p+=i;
1099                 n-=param_len;
1100
1101 #ifndef OPENSSL_NO_RSA
1102                 if (alg & SSL_aRSA)
1103                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1104 #else
1105                 if (0)
1106                         ;
1107 #endif
1108 #ifndef OPENSSL_NO_DSA
1109                 else if (alg & SSL_aDSS)
1110                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1111 #endif
1112                 /* else anonymous DH, so no certificate or pkey. */
1113
1114                 s->session->sess_cert->peer_dh_tmp=dh;
1115                 dh=NULL;
1116                 }
1117         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1118                 {
1119                 al=SSL_AD_ILLEGAL_PARAMETER;
1120                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1121                 goto f_err;
1122                 }
1123 #endif /* !OPENSSL_NO_DH */
1124         if (alg & SSL_aFZA)
1125                 {
1126                 al=SSL_AD_HANDSHAKE_FAILURE;
1127                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1128                 goto f_err;
1129                 }
1130
1131
1132         /* p points to the next byte, there are 'n' bytes left */
1133
1134
1135         /* if it was signed, check the signature */
1136         if (pkey != NULL)
1137                 {
1138                 n2s(p,i);
1139                 n-=2;
1140                 j=EVP_PKEY_size(pkey);
1141
1142                 if ((i != n) || (n > j) || (n <= 0))
1143                         {
1144                         /* wrong packet length */
1145                         al=SSL_AD_DECODE_ERROR;
1146                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1147                         goto f_err;
1148                         }
1149
1150 #ifndef OPENSSL_NO_RSA
1151                 if (pkey->type == EVP_PKEY_RSA)
1152                         {
1153                         int num;
1154
1155                         j=0;
1156                         q=md_buf;
1157                         for (num=2; num > 0; num--)
1158                                 {
1159                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1160                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1161                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1162                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1163                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1164                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1165                                 q+=i;
1166                                 j+=i;
1167                                 }
1168                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1169                                                                 pkey->pkey.rsa);
1170                         if (i < 0)
1171                                 {
1172                                 al=SSL_AD_DECRYPT_ERROR;
1173                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1174                                 goto f_err;
1175                                 }
1176                         if (i == 0)
1177                                 {
1178                                 /* bad signature */
1179                                 al=SSL_AD_DECRYPT_ERROR;
1180                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1181                                 goto f_err;
1182                                 }
1183                         }
1184                 else
1185 #endif
1186 #ifndef OPENSSL_NO_DSA
1187                         if (pkey->type == EVP_PKEY_DSA)
1188                         {
1189                         /* lets do DSS */
1190                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1191                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1192                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1193                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1194                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1195                                 {
1196                                 /* bad signature */
1197                                 al=SSL_AD_DECRYPT_ERROR;
1198                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1199                                 goto f_err;
1200                                 }
1201                         }
1202                 else
1203 #endif
1204                         {
1205                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1206                         goto err;
1207                         }
1208                 }
1209         else
1210                 {
1211                 /* still data left over */
1212                 if (!(alg & SSL_aNULL))
1213                         {
1214                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1215                         goto err;
1216                         }
1217                 if (n != 0)
1218                         {
1219                         al=SSL_AD_DECODE_ERROR;
1220                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1221                         goto f_err;
1222                         }
1223                 }
1224         EVP_PKEY_free(pkey);
1225         EVP_MD_CTX_cleanup(&md_ctx);
1226         return(1);
1227 f_err:
1228         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1229 err:
1230         EVP_PKEY_free(pkey);
1231 #ifndef OPENSSL_NO_RSA
1232         if (rsa != NULL)
1233                 RSA_free(rsa);
1234 #endif
1235 #ifndef OPENSSL_NO_DH
1236         if (dh != NULL)
1237                 DH_free(dh);
1238 #endif
1239         EVP_MD_CTX_cleanup(&md_ctx);
1240         return(-1);
1241         }
1242
1243 static int ssl3_get_certificate_request(SSL *s)
1244         {
1245         int ok,ret=0;
1246         unsigned long n,nc,l;
1247         unsigned int llen,ctype_num,i;
1248         X509_NAME *xn=NULL;
1249         unsigned char *p,*d,*q;
1250         STACK_OF(X509_NAME) *ca_sk=NULL;
1251
1252         n=ssl3_get_message(s,
1253                 SSL3_ST_CR_CERT_REQ_A,
1254                 SSL3_ST_CR_CERT_REQ_B,
1255                 -1,
1256                 s->max_cert_list,
1257                 &ok);
1258
1259         if (!ok) return((int)n);
1260
1261         s->s3->tmp.cert_req=0;
1262
1263         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1264                 {
1265                 s->s3->tmp.reuse_message=1;
1266                 return(1);
1267                 }
1268
1269         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1270                 {
1271                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1272                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1273                 goto err;
1274                 }
1275
1276         /* TLS does not like anon-DH with client cert */
1277         if (s->version > SSL3_VERSION)
1278                 {
1279                 l=s->s3->tmp.new_cipher->algorithms;
1280                 if (l & SSL_aNULL)
1281                         {
1282                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1283                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1284                         goto err;
1285                         }
1286                 }
1287
1288         d=p=(unsigned char *)s->init_msg;
1289
1290         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1291                 {
1292                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1293                 goto err;
1294                 }
1295
1296         /* get the certificate types */
1297         ctype_num= *(p++);
1298         if (ctype_num > SSL3_CT_NUMBER)
1299                 ctype_num=SSL3_CT_NUMBER;
1300         for (i=0; i<ctype_num; i++)
1301                 s->s3->tmp.ctype[i]= p[i];
1302         p+=ctype_num;
1303
1304         /* get the CA RDNs */
1305         n2s(p,llen);
1306 #if 0
1307 {
1308 FILE *out;
1309 out=fopen("/tmp/vsign.der","w");
1310 fwrite(p,1,llen,out);
1311 fclose(out);
1312 }
1313 #endif
1314
1315         if ((llen+ctype_num+2+1) != n)
1316                 {
1317                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1318                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1319                 goto err;
1320                 }
1321
1322         for (nc=0; nc<llen; )
1323                 {
1324                 n2s(p,l);
1325                 if ((l+nc+2) > llen)
1326                         {
1327                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1328                                 goto cont; /* netscape bugs */
1329                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1330                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1331                         goto err;
1332                         }
1333
1334                 q=p;
1335
1336                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1337                         {
1338                         /* If netscape tolerance is on, ignore errors */
1339                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1340                                 goto cont;
1341                         else
1342                                 {
1343                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1344                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1345                                 goto err;
1346                                 }
1347                         }
1348
1349                 if (q != (p+l))
1350                         {
1351                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1352                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1353                         goto err;
1354                         }
1355                 if (!sk_X509_NAME_push(ca_sk,xn))
1356                         {
1357                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1358                         goto err;
1359                         }
1360
1361                 p+=l;
1362                 nc+=l+2;
1363                 }
1364
1365         if (0)
1366                 {
1367 cont:
1368                 ERR_clear_error();
1369                 }
1370
1371         /* we should setup a certificate to return.... */
1372         s->s3->tmp.cert_req=1;
1373         s->s3->tmp.ctype_num=ctype_num;
1374         if (s->s3->tmp.ca_names != NULL)
1375                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1376         s->s3->tmp.ca_names=ca_sk;
1377         ca_sk=NULL;
1378
1379         ret=1;
1380 err:
1381         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1382         return(ret);
1383         }
1384
1385 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1386         {
1387         return(X509_NAME_cmp(*a,*b));
1388         }
1389
1390 static int ssl3_get_server_done(SSL *s)
1391         {
1392         int ok,ret=0;
1393         long n;
1394
1395         n=ssl3_get_message(s,
1396                 SSL3_ST_CR_SRVR_DONE_A,
1397                 SSL3_ST_CR_SRVR_DONE_B,
1398                 SSL3_MT_SERVER_DONE,
1399                 30, /* should be very small, like 0 :-) */
1400                 &ok);
1401
1402         if (!ok) return((int)n);
1403         if (n > 0)
1404                 {
1405                 /* should contain no data */
1406                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1407                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1408                 return -1;
1409                 }
1410         ret=1;
1411         return(ret);
1412         }
1413
1414 static int ssl3_send_client_key_exchange(SSL *s)
1415         {
1416         unsigned char *p,*d;
1417         int n;
1418         unsigned long l;
1419 #ifndef OPENSSL_NO_RSA
1420         unsigned char *q;
1421         EVP_PKEY *pkey=NULL;
1422 #endif
1423 #ifndef OPENSSL_NO_KRB5
1424         KSSL_ERR kssl_err;
1425 #endif /* OPENSSL_NO_KRB5 */
1426
1427         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1428                 {
1429                 d=(unsigned char *)s->init_buf->data;
1430                 p= &(d[4]);
1431
1432                 l=s->s3->tmp.new_cipher->algorithms;
1433
1434                 /* Fool emacs indentation */
1435                 if (0) {}
1436 #ifndef OPENSSL_NO_RSA
1437                 else if (l & SSL_kRSA)
1438                         {
1439                         RSA *rsa;
1440                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1441
1442                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1443                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1444                         else
1445                                 {
1446                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1447                                 if ((pkey == NULL) ||
1448                                         (pkey->type != EVP_PKEY_RSA) ||
1449                                         (pkey->pkey.rsa == NULL))
1450                                         {
1451                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1452                                         goto err;
1453                                         }
1454                                 rsa=pkey->pkey.rsa;
1455                                 EVP_PKEY_free(pkey);
1456                                 }
1457                                 
1458                         tmp_buf[0]=s->client_version>>8;
1459                         tmp_buf[1]=s->client_version&0xff;
1460                         if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1461                                         goto err;
1462
1463                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1464
1465                         q=p;
1466                         /* Fix buf for TLS and beyond */
1467                         if (s->version > SSL3_VERSION)
1468                                 p+=2;
1469                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1470                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1471 #ifdef PKCS1_CHECK
1472                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1473                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1474 #endif
1475                         if (n <= 0)
1476                                 {
1477                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1478                                 goto err;
1479                                 }
1480
1481                         /* Fix buf for TLS and beyond */
1482                         if (s->version > SSL3_VERSION)
1483                                 {
1484                                 s2n(n,q);
1485                                 n+=2;
1486                                 }
1487
1488                         s->session->master_key_length=
1489                                 s->method->ssl3_enc->generate_master_secret(s,
1490                                         s->session->master_key,
1491                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1492                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1493                         }
1494 #endif
1495 #ifndef OPENSSL_NO_KRB5
1496                 else if (l & SSL_kKRB5)
1497                         {
1498                         krb5_error_code krb5rc;
1499                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1500                         /*  krb5_data   krb5_ap_req;  */
1501                         krb5_data       *enc_ticket;
1502                         krb5_data       authenticator, *authp = NULL;
1503                         EVP_CIPHER_CTX  ciph_ctx;
1504                         EVP_CIPHER      *enc = NULL;
1505                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1506                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1507                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
1508                                                 + EVP_MAX_IV_LENGTH];
1509                         int             padl, outl = sizeof(epms);
1510
1511                         EVP_CIPHER_CTX_init(&ciph_ctx);
1512
1513 #ifdef KSSL_DEBUG
1514                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1515                                 l, SSL_kKRB5);
1516 #endif  /* KSSL_DEBUG */
1517
1518                         authp = NULL;
1519 #ifdef KRB5SENDAUTH
1520                         if (KRB5SENDAUTH)  authp = &authenticator;
1521 #endif  /* KRB5SENDAUTH */
1522
1523                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1524                                 &kssl_err);
1525                         enc = kssl_map_enc(kssl_ctx->enctype);
1526                         if (enc == NULL)
1527                             goto err;
1528 #ifdef KSSL_DEBUG
1529                         {
1530                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1531                         if (krb5rc && kssl_err.text)
1532                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1533                         }
1534 #endif  /* KSSL_DEBUG */
1535
1536                         if (krb5rc)
1537                                 {
1538                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1539                                                 SSL_AD_HANDSHAKE_FAILURE);
1540                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1541                                                 kssl_err.reason);
1542                                 goto err;
1543                                 }
1544
1545                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1546                         **  in place of RFC 2712 KerberosWrapper, as in:
1547                         **
1548                         **  Send ticket (copy to *p, set n = length)
1549                         **  n = krb5_ap_req.length;
1550                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1551                         **  if (krb5_ap_req.data)  
1552                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1553                         **
1554                         **  Now using real RFC 2712 KerberosWrapper
1555                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1556                         **  Note: 2712 "opaque" types are here replaced
1557                         **  with a 2-byte length followed by the value.
1558                         **  Example:
1559                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1560                         **  Where "xx xx" = length bytes.  Shown here with
1561                         **  optional authenticator omitted.
1562                         */
1563
1564                         /*  KerberosWrapper.Ticket              */
1565                         s2n(enc_ticket->length,p);
1566                         memcpy(p, enc_ticket->data, enc_ticket->length);
1567                         p+= enc_ticket->length;
1568                         n = enc_ticket->length + 2;
1569
1570                         /*  KerberosWrapper.Authenticator       */
1571                         if (authp  &&  authp->length)  
1572                                 {
1573                                 s2n(authp->length,p);
1574                                 memcpy(p, authp->data, authp->length);
1575                                 p+= authp->length;
1576                                 n+= authp->length + 2;
1577                                 
1578                                 free(authp->data);
1579                                 authp->data = NULL;
1580                                 authp->length = 0;
1581                                 }
1582                         else
1583                                 {
1584                                 s2n(0,p);/*  null authenticator length  */
1585                                 n+=2;
1586                                 }
1587  
1588                         if (RAND_bytes(tmp_buf,SSL_MAX_MASTER_KEY_LENGTH) <= 0)
1589                             goto err;
1590
1591                         /*  20010420 VRS.  Tried it this way; failed.
1592                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1593                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1594                         **                              kssl_ctx->length);
1595                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1596                         */
1597
1598                         memset(iv, 0, EVP_MAX_IV_LENGTH);  /* per RFC 1510 */
1599                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1600                                 kssl_ctx->key,iv);
1601                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1602                                 SSL_MAX_MASTER_KEY_LENGTH);
1603                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1604                         outl += padl;
1605                         if (outl > sizeof epms)
1606                                 {
1607                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1608                                 goto err;
1609                                 }
1610                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1611
1612                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1613                         s2n(outl,p);
1614                         memcpy(p, epms, outl);
1615                         p+=outl;
1616                         n+=outl + 2;
1617
1618                         s->session->master_key_length=
1619                                 s->method->ssl3_enc->generate_master_secret(s,
1620                                         s->session->master_key,
1621                                         tmp_buf, SSL_MAX_MASTER_KEY_LENGTH);
1622
1623                         memset(tmp_buf, 0, SSL_MAX_MASTER_KEY_LENGTH);
1624                         memset(epms, 0, outl);
1625                         }
1626 #endif
1627 #ifndef OPENSSL_NO_DH
1628                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1629                         {
1630                         DH *dh_srvr,*dh_clnt;
1631
1632                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1633                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1634                         else
1635                                 {
1636                                 /* we get them from the cert */
1637                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1638                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1639                                 goto err;
1640                                 }
1641                         
1642                         /* generate a new random key */
1643                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1644                                 {
1645                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1646                                 goto err;
1647                                 }
1648                         if (!DH_generate_key(dh_clnt))
1649                                 {
1650                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1651                                 goto err;
1652                                 }
1653
1654                         /* use the 'p' output buffer for the DH key, but
1655                          * make sure to clear it out afterwards */
1656
1657                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1658
1659                         if (n <= 0)
1660                                 {
1661                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1662                                 goto err;
1663                                 }
1664
1665                         /* generate master key from the result */
1666                         s->session->master_key_length=
1667                                 s->method->ssl3_enc->generate_master_secret(s,
1668                                         s->session->master_key,p,n);
1669                         /* clean up */
1670                         memset(p,0,n);
1671
1672                         /* send off the data */
1673                         n=BN_num_bytes(dh_clnt->pub_key);
1674                         s2n(n,p);
1675                         BN_bn2bin(dh_clnt->pub_key,p);
1676                         n+=2;
1677
1678                         DH_free(dh_clnt);
1679
1680                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1681                         }
1682 #endif
1683                 else
1684                         {
1685                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1686                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1687                         goto err;
1688                         }
1689                 
1690                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1691                 l2n3(n,d);
1692
1693                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1694                 /* number of bytes to write */
1695                 s->init_num=n+4;
1696                 s->init_off=0;
1697                 }
1698
1699         /* SSL3_ST_CW_KEY_EXCH_B */
1700         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1701 err:
1702         return(-1);
1703         }
1704
1705 static int ssl3_send_client_verify(SSL *s)
1706         {
1707         unsigned char *p,*d;
1708         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1709         EVP_PKEY *pkey;
1710 #ifndef OPENSSL_NO_RSA
1711         unsigned u=0;
1712 #endif
1713         unsigned long n;
1714 #ifndef OPENSSL_NO_DSA
1715         int j;
1716 #endif
1717
1718         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1719                 {
1720                 d=(unsigned char *)s->init_buf->data;
1721                 p= &(d[4]);
1722                 pkey=s->cert->key->privatekey;
1723
1724                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1725                         &(data[MD5_DIGEST_LENGTH]));
1726
1727 #ifndef OPENSSL_NO_RSA
1728                 if (pkey->type == EVP_PKEY_RSA)
1729                         {
1730                         s->method->ssl3_enc->cert_verify_mac(s,
1731                                 &(s->s3->finish_dgst1),&(data[0]));
1732                         if (RSA_sign(NID_md5_sha1, data,
1733                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1734                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1735                                 {
1736                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1737                                 goto err;
1738                                 }
1739                         s2n(u,p);
1740                         n=u+2;
1741                         }
1742                 else
1743 #endif
1744 #ifndef OPENSSL_NO_DSA
1745                         if (pkey->type == EVP_PKEY_DSA)
1746                         {
1747                         if (!DSA_sign(pkey->save_type,
1748                                 &(data[MD5_DIGEST_LENGTH]),
1749                                 SHA_DIGEST_LENGTH,&(p[2]),
1750                                 (unsigned int *)&j,pkey->pkey.dsa))
1751                                 {
1752                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1753                                 goto err;
1754                                 }
1755                         s2n(j,p);
1756                         n=j+2;
1757                         }
1758                 else
1759 #endif
1760                         {
1761                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1762                         goto err;
1763                         }
1764                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1765                 l2n3(n,d);
1766
1767                 s->init_num=(int)n+4;
1768                 s->init_off=0;
1769                 }
1770         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1771 err:
1772         return(-1);
1773         }
1774
1775 static int ssl3_send_client_certificate(SSL *s)
1776         {
1777         X509 *x509=NULL;
1778         EVP_PKEY *pkey=NULL;
1779         int i;
1780         unsigned long l;
1781
1782         if (s->state == SSL3_ST_CW_CERT_A)
1783                 {
1784                 if ((s->cert == NULL) ||
1785                         (s->cert->key->x509 == NULL) ||
1786                         (s->cert->key->privatekey == NULL))
1787                         s->state=SSL3_ST_CW_CERT_B;
1788                 else
1789                         s->state=SSL3_ST_CW_CERT_C;
1790                 }
1791
1792         /* We need to get a client cert */
1793         if (s->state == SSL3_ST_CW_CERT_B)
1794                 {
1795                 /* If we get an error, we need to
1796                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1797                  * We then get retied later */
1798                 i=0;
1799                 if (s->ctx->client_cert_cb != NULL)
1800                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1801                 if (i < 0)
1802                         {
1803                         s->rwstate=SSL_X509_LOOKUP;
1804                         return(-1);
1805                         }
1806                 s->rwstate=SSL_NOTHING;
1807                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1808                         {
1809                         s->state=SSL3_ST_CW_CERT_B;
1810                         if (    !SSL_use_certificate(s,x509) ||
1811                                 !SSL_use_PrivateKey(s,pkey))
1812                                 i=0;
1813                         }
1814                 else if (i == 1)
1815                         {
1816                         i=0;
1817                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1818                         }
1819
1820                 if (x509 != NULL) X509_free(x509);
1821                 if (pkey != NULL) EVP_PKEY_free(pkey);
1822                 if (i == 0)
1823                         {
1824                         if (s->version == SSL3_VERSION)
1825                                 {
1826                                 s->s3->tmp.cert_req=0;
1827                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1828                                 return(1);
1829                                 }
1830                         else
1831                                 {
1832                                 s->s3->tmp.cert_req=2;
1833                                 }
1834                         }
1835
1836                 /* Ok, we have a cert */
1837                 s->state=SSL3_ST_CW_CERT_C;
1838                 }
1839
1840         if (s->state == SSL3_ST_CW_CERT_C)
1841                 {
1842                 s->state=SSL3_ST_CW_CERT_D;
1843                 l=ssl3_output_cert_chain(s,
1844                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1845                 s->init_num=(int)l;
1846                 s->init_off=0;
1847                 }
1848         /* SSL3_ST_CW_CERT_D */
1849         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1850         }
1851
1852 #define has_bits(i,m)   (((i)&(m)) == (m))
1853
1854 static int ssl3_check_cert_and_algorithm(SSL *s)
1855         {
1856         int i,idx;
1857         long algs;
1858         EVP_PKEY *pkey=NULL;
1859         SESS_CERT *sc;
1860 #ifndef OPENSSL_NO_RSA
1861         RSA *rsa;
1862 #endif
1863 #ifndef OPENSSL_NO_DH
1864         DH *dh;
1865 #endif
1866
1867         sc=s->session->sess_cert;
1868
1869         if (sc == NULL)
1870                 {
1871                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
1872                 goto err;
1873                 }
1874
1875         algs=s->s3->tmp.new_cipher->algorithms;
1876
1877         /* we don't have a certificate */
1878         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
1879                 return(1);
1880
1881 #ifndef OPENSSL_NO_RSA
1882         rsa=s->session->sess_cert->peer_rsa_tmp;
1883 #endif
1884 #ifndef OPENSSL_NO_DH
1885         dh=s->session->sess_cert->peer_dh_tmp;
1886 #endif
1887
1888         /* This is the passed certificate */
1889
1890         idx=sc->peer_cert_type;
1891         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1892         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1893         EVP_PKEY_free(pkey);
1894
1895         
1896         /* Check that we have a certificate if we require one */
1897         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1898                 {
1899                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1900                 goto f_err;
1901                 }
1902 #ifndef OPENSSL_NO_DSA
1903         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1904                 {
1905                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1906                 goto f_err;
1907                 }
1908 #endif
1909 #ifndef OPENSSL_NO_RSA
1910         if ((algs & SSL_kRSA) &&
1911                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1912                 {
1913                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1914                 goto f_err;
1915                 }
1916 #endif
1917 #ifndef OPENSSL_NO_DH
1918         if ((algs & SSL_kEDH) &&
1919                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1920                 {
1921                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1922                 goto f_err;
1923                 }
1924         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1925                 {
1926                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1927                 goto f_err;
1928                 }
1929 #ifndef OPENSSL_NO_DSA
1930         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1931                 {
1932                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1933                 goto f_err;
1934                 }
1935 #endif
1936 #endif
1937
1938         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1939                 {
1940 #ifndef OPENSSL_NO_RSA
1941                 if (algs & SSL_kRSA)
1942                         {
1943                         if (rsa == NULL
1944                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1945                                 {
1946                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1947                                 goto f_err;
1948                                 }
1949                         }
1950                 else
1951 #endif
1952 #ifndef OPENSSL_NO_DH
1953                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1954                             {
1955                             if (dh == NULL
1956                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1957                                 {
1958                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1959                                 goto f_err;
1960                                 }
1961                         }
1962                 else
1963 #endif
1964                         {
1965                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1966                         goto f_err;
1967                         }
1968                 }
1969         return(1);
1970 f_err:
1971         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1972 err:
1973         return(0);
1974         }
1975