eec45cfa485d0d0a7ae6a4f06a3f3abf430d15b4
[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 #include <stdio.h>
60 #include <openssl/buffer.h>
61 #include <openssl/rand.h>
62 #include <openssl/objects.h>
63 #include <openssl/md5.h>
64 #include <openssl/sha.h>
65 #include <openssl/evp.h>
66 #include "ssl_locl.h"
67
68 static SSL_METHOD *ssl3_get_client_method(int ver);
69 static int ssl3_client_hello(SSL *s);
70 static int ssl3_get_server_hello(SSL *s);
71 static int ssl3_get_certificate_request(SSL *s);
72 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
73 static int ssl3_get_server_done(SSL *s);
74 static int ssl3_send_client_verify(SSL *s);
75 static int ssl3_send_client_certificate(SSL *s);
76 static int ssl3_send_client_key_exchange(SSL *s);
77 static int ssl3_get_key_exchange(SSL *s);
78 static int ssl3_get_server_certificate(SSL *s);
79 static int ssl3_check_cert_and_algorithm(SSL *s);
80 static SSL_METHOD *ssl3_get_client_method(int ver)
81         {
82         if (ver == SSL3_VERSION)
83                 return(SSLv3_client_method());
84         else
85                 return(NULL);
86         }
87
88 SSL_METHOD *SSLv3_client_method(void)
89         {
90         static int init=1;
91         static SSL_METHOD SSLv3_client_data;
92
93         if (init)
94                 {
95                 init=0;
96                 memcpy((char *)&SSLv3_client_data,(char *)sslv3_base_method(),
97                         sizeof(SSL_METHOD));
98                 SSLv3_client_data.ssl_connect=ssl3_connect;
99                 SSLv3_client_data.get_ssl_method=ssl3_get_client_method;
100                 }
101         return(&SSLv3_client_data);
102         }
103
104 int ssl3_connect(SSL *s)
105         {
106         BUF_MEM *buf;
107         unsigned long Time=time(NULL),l;
108         long num1;
109         void (*cb)()=NULL;
110         int ret= -1;
111         int new_state,state,skip=0;;
112
113         RAND_add(&Time,sizeof(Time),0);
114         ERR_clear_error();
115         clear_sys_error();
116
117         if (s->info_callback != NULL)
118                 cb=s->info_callback;
119         else if (s->ctx->info_callback != NULL)
120                 cb=s->ctx->info_callback;
121         
122         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
123         s->in_handshake++;
124
125         for (;;)
126                 {
127                 state=s->state;
128
129                 switch(s->state)
130                         {
131                 case SSL_ST_RENEGOTIATE:
132                         s->new_session=1;
133                         s->state=SSL_ST_CONNECT;
134                         s->ctx->stats.sess_connect_renegotiate++;
135                         /* break */
136                 case SSL_ST_BEFORE:
137                 case SSL_ST_CONNECT:
138                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
139                 case SSL_ST_OK|SSL_ST_CONNECT:
140
141                         s->server=0;
142                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
143
144                         if ((s->version & 0xff00 ) != 0x0300)
145                                 {
146                                 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_INTERNAL_ERROR);
147                                 ret = -1;
148                                 goto end;
149                                 }
150                                 
151                         /* s->version=SSL3_VERSION; */
152                         s->type=SSL_ST_CONNECT;
153
154                         if (s->init_buf == NULL)
155                                 {
156                                 if ((buf=BUF_MEM_new()) == NULL)
157                                         {
158                                         ret= -1;
159                                         goto end;
160                                         }
161                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
162                                         {
163                                         ret= -1;
164                                         goto end;
165                                         }
166                                 s->init_buf=buf;
167                                 }
168
169                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
170
171                         /* setup buffing BIO */
172                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
173
174                         /* don't push the buffering BIO quite yet */
175
176                         ssl3_init_finished_mac(s);
177
178                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
179                         s->ctx->stats.sess_connect++;
180                         s->init_num=0;
181                         break;
182
183                 case SSL3_ST_CW_CLNT_HELLO_A:
184                 case SSL3_ST_CW_CLNT_HELLO_B:
185
186                         s->shutdown=0;
187                         ret=ssl3_client_hello(s);
188                         if (ret <= 0) goto end;
189                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
190                         s->init_num=0;
191
192                         /* turn on buffering for the next lot of output */
193                         if (s->bbio != s->wbio)
194                                 s->wbio=BIO_push(s->bbio,s->wbio);
195
196                         break;
197
198                 case SSL3_ST_CR_SRVR_HELLO_A:
199                 case SSL3_ST_CR_SRVR_HELLO_B:
200                         ret=ssl3_get_server_hello(s);
201                         if (ret <= 0) goto end;
202                         if (s->hit)
203                                 s->state=SSL3_ST_CR_FINISHED_A;
204                         else
205                                 s->state=SSL3_ST_CR_CERT_A;
206                         s->init_num=0;
207                         break;
208
209                 case SSL3_ST_CR_CERT_A:
210                 case SSL3_ST_CR_CERT_B:
211                         /* Check if it is anon DH */
212                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
213                                 {
214                                 ret=ssl3_get_server_certificate(s);
215                                 if (ret <= 0) goto end;
216                                 }
217                         else
218                                 skip=1;
219                         s->state=SSL3_ST_CR_KEY_EXCH_A;
220                         s->init_num=0;
221                         break;
222
223                 case SSL3_ST_CR_KEY_EXCH_A:
224                 case SSL3_ST_CR_KEY_EXCH_B:
225                         ret=ssl3_get_key_exchange(s);
226                         if (ret <= 0) goto end;
227                         s->state=SSL3_ST_CR_CERT_REQ_A;
228                         s->init_num=0;
229
230                         /* at this point we check that we have the
231                          * required stuff from the server */
232                         if (!ssl3_check_cert_and_algorithm(s))
233                                 {
234                                 ret= -1;
235                                 goto end;
236                                 }
237                         break;
238
239                 case SSL3_ST_CR_CERT_REQ_A:
240                 case SSL3_ST_CR_CERT_REQ_B:
241                         ret=ssl3_get_certificate_request(s);
242                         if (ret <= 0) goto end;
243                         s->state=SSL3_ST_CR_SRVR_DONE_A;
244                         s->init_num=0;
245                         break;
246
247                 case SSL3_ST_CR_SRVR_DONE_A:
248                 case SSL3_ST_CR_SRVR_DONE_B:
249                         ret=ssl3_get_server_done(s);
250                         if (ret <= 0) goto end;
251                         if (s->s3->tmp.cert_req)
252                                 s->state=SSL3_ST_CW_CERT_A;
253                         else
254                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
255                         s->init_num=0;
256
257                         break;
258
259                 case SSL3_ST_CW_CERT_A:
260                 case SSL3_ST_CW_CERT_B:
261                 case SSL3_ST_CW_CERT_C:
262                 case SSL3_ST_CW_CERT_D:
263                         ret=ssl3_send_client_certificate(s);
264                         if (ret <= 0) goto end;
265                         s->state=SSL3_ST_CW_KEY_EXCH_A;
266                         s->init_num=0;
267                         break;
268
269                 case SSL3_ST_CW_KEY_EXCH_A:
270                 case SSL3_ST_CW_KEY_EXCH_B:
271                         ret=ssl3_send_client_key_exchange(s);
272                         if (ret <= 0) goto end;
273                         l=s->s3->tmp.new_cipher->algorithms;
274                         /* EAY EAY EAY need to check for DH fix cert
275                          * sent back */
276                         /* For TLS, cert_req is set to 2, so a cert chain
277                          * of nothing is sent, but no verify packet is sent */
278                         if (s->s3->tmp.cert_req == 1)
279                                 {
280                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
281                                 }
282                         else
283                                 {
284                                 s->state=SSL3_ST_CW_CHANGE_A;
285                                 s->s3->change_cipher_spec=0;
286                                 }
287
288                         s->init_num=0;
289                         break;
290
291                 case SSL3_ST_CW_CERT_VRFY_A:
292                 case SSL3_ST_CW_CERT_VRFY_B:
293                         ret=ssl3_send_client_verify(s);
294                         if (ret <= 0) goto end;
295                         s->state=SSL3_ST_CW_CHANGE_A;
296                         s->init_num=0;
297                         s->s3->change_cipher_spec=0;
298                         break;
299
300                 case SSL3_ST_CW_CHANGE_A:
301                 case SSL3_ST_CW_CHANGE_B:
302                         ret=ssl3_send_change_cipher_spec(s,
303                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
304                         if (ret <= 0) goto end;
305                         s->state=SSL3_ST_CW_FINISHED_A;
306                         s->init_num=0;
307
308                         s->session->cipher=s->s3->tmp.new_cipher;
309                         if (s->s3->tmp.new_compression == NULL)
310                                 s->session->compress_meth=0;
311                         else
312                                 s->session->compress_meth=
313                                         s->s3->tmp.new_compression->id;
314                         if (!s->method->ssl3_enc->setup_key_block(s))
315                                 {
316                                 ret= -1;
317                                 goto end;
318                                 }
319
320                         if (!s->method->ssl3_enc->change_cipher_state(s,
321                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
322                                 {
323                                 ret= -1;
324                                 goto end;
325                                 }
326
327                         break;
328
329                 case SSL3_ST_CW_FINISHED_A:
330                 case SSL3_ST_CW_FINISHED_B:
331                         ret=ssl3_send_finished(s,
332                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
333                                 s->method->ssl3_enc->client_finished_label,
334                                 s->method->ssl3_enc->client_finished_label_len);
335                         if (ret <= 0) goto end;
336                         s->state=SSL3_ST_CW_FLUSH;
337
338                         /* clear flags */
339                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
340                         if (s->hit)
341                                 {
342                                 s->s3->tmp.next_state=SSL_ST_OK;
343                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
344                                         {
345                                         s->state=SSL_ST_OK;
346                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
347                                         s->s3->delay_buf_pop_ret=0;
348                                         }
349                                 }
350                         else
351                                 {
352                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
353                                 }
354                         s->init_num=0;
355                         break;
356
357                 case SSL3_ST_CR_FINISHED_A:
358                 case SSL3_ST_CR_FINISHED_B:
359
360                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
361                                 SSL3_ST_CR_FINISHED_B);
362                         if (ret <= 0) goto end;
363
364                         if (s->hit)
365                                 s->state=SSL3_ST_CW_CHANGE_A;
366                         else
367                                 s->state=SSL_ST_OK;
368                         s->init_num=0;
369                         break;
370
371                 case SSL3_ST_CW_FLUSH:
372                         /* number of bytes to be flushed */
373                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
374                         if (num1 > 0)
375                                 {
376                                 s->rwstate=SSL_WRITING;
377                                 num1=BIO_flush(s->wbio);
378                                 if (num1 <= 0) { ret= -1; goto end; }
379                                 s->rwstate=SSL_NOTHING;
380                                 }
381
382                         s->state=s->s3->tmp.next_state;
383                         break;
384
385                 case SSL_ST_OK:
386                         /* clean a few things up */
387                         ssl3_cleanup_key_block(s);
388
389                         if (s->init_buf != NULL)
390                                 {
391                                 BUF_MEM_free(s->init_buf);
392                                 s->init_buf=NULL;
393                                 }
394
395                         /* If we are not 'joining' the last two packets,
396                          * remove the buffering now */
397                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
398                                 ssl_free_wbio_buffer(s);
399                         /* else do it later in ssl3_write */
400
401                         s->init_num=0;
402                         s->new_session=0;
403
404                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
405                         if (s->hit) s->ctx->stats.sess_hit++;
406
407                         ret=1;
408                         /* s->server=0; */
409                         s->handshake_func=ssl3_connect;
410                         s->ctx->stats.sess_connect_good++;
411
412                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
413
414                         goto end;
415                         /* break; */
416                         
417                 default:
418                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
419                         ret= -1;
420                         goto end;
421                         /* break; */
422                         }
423
424                 /* did we do anything */
425                 if (!s->s3->tmp.reuse_message && !skip)
426                         {
427                         if (s->debug)
428                                 {
429                                 if ((ret=BIO_flush(s->wbio)) <= 0)
430                                         goto end;
431                                 }
432
433                         if ((cb != NULL) && (s->state != state))
434                                 {
435                                 new_state=s->state;
436                                 s->state=state;
437                                 cb(s,SSL_CB_CONNECT_LOOP,1);
438                                 s->state=new_state;
439                                 }
440                         }
441                 skip=0;
442                 }
443 end:
444         if (cb != NULL)
445                 cb(s,SSL_CB_CONNECT_EXIT,ret);
446         s->in_handshake--;
447         return(ret);
448         }
449
450
451 static int ssl3_client_hello(SSL *s)
452         {
453         unsigned char *buf;
454         unsigned char *p,*d;
455         int i,j;
456         unsigned long Time,l;
457         SSL_COMP *comp;
458
459         buf=(unsigned char *)s->init_buf->data;
460         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
461                 {
462                 if ((s->session == NULL) ||
463                         (s->session->ssl_version != s->version) ||
464                         (s->session->not_resumable))
465                         {
466                         if (!ssl_get_new_session(s,0))
467                                 goto err;
468                         }
469                 /* else use the pre-loaded session */
470
471                 p=s->s3->client_random;
472                 Time=time(NULL);                        /* Time */
473                 l2n(Time,p);
474                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
475
476                 /* Do the message type and length last */
477                 d=p= &(buf[4]);
478
479                 *(p++)=s->version>>8;
480                 *(p++)=s->version&0xff;
481                 s->client_version=s->version;
482
483                 /* Random stuff */
484                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
485                 p+=SSL3_RANDOM_SIZE;
486
487                 /* Session ID */
488                 if (s->new_session)
489                         i=0;
490                 else
491                         i=s->session->session_id_length;
492                 *(p++)=i;
493                 if (i != 0)
494                         {
495                         memcpy(p,s->session->session_id,i);
496                         p+=i;
497                         }
498                 
499                 /* Ciphers supported */
500                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]));
501                 if (i == 0)
502                         {
503                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
504                         goto err;
505                         }
506                 s2n(i,p);
507                 p+=i;
508
509                 /* COMPRESSION */
510                 if (s->ctx->comp_methods == NULL)
511                         j=0;
512                 else
513                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
514                 *(p++)=1+j;
515                 for (i=0; i<j; i++)
516                         {
517                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
518                         *(p++)=comp->id;
519                         }
520                 *(p++)=0; /* Add the NULL method */
521                 
522                 l=(p-d);
523                 d=buf;
524                 *(d++)=SSL3_MT_CLIENT_HELLO;
525                 l2n3(l,d);
526
527                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
528                 /* number of bytes to write */
529                 s->init_num=p-buf;
530                 s->init_off=0;
531                 }
532
533         /* SSL3_ST_CW_CLNT_HELLO_B */
534         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
535 err:
536         return(-1);
537         }
538
539 static int ssl3_get_server_hello(SSL *s)
540         {
541         STACK_OF(SSL_CIPHER) *sk;
542         SSL_CIPHER *c;
543         unsigned char *p,*d;
544         int i,al,ok;
545         unsigned int j;
546         long n;
547         SSL_COMP *comp;
548
549         n=ssl3_get_message(s,
550                 SSL3_ST_CR_SRVR_HELLO_A,
551                 SSL3_ST_CR_SRVR_HELLO_B,
552                 SSL3_MT_SERVER_HELLO,
553                 300, /* ?? */
554                 &ok);
555
556         if (!ok) return((int)n);
557         d=p=(unsigned char *)s->init_buf->data;
558
559         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
560                 {
561                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
562                 s->version=(s->version&0xff00)|p[1];
563                 al=SSL_AD_PROTOCOL_VERSION;
564                 goto f_err;
565                 }
566         p+=2;
567
568         /* load the server hello data */
569         /* load the server random */
570         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
571         p+=SSL3_RANDOM_SIZE;
572
573         /* get the session-id */
574         j= *(p++);
575
576         if ((j != 0) && (j != SSL3_SESSION_ID_SIZE))
577                 {
578                 /* SSLref returns 16 :-( */
579                 if (j < SSL2_SSL_SESSION_ID_LENGTH)
580                         {
581                         al=SSL_AD_ILLEGAL_PARAMETER;
582                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_SHORT);
583                         goto f_err;
584                         }
585                 }
586         if (j != 0 && j == s->session->session_id_length
587             && memcmp(p,s->session->session_id,j) == 0)
588             {
589             if(s->sid_ctx_length != s->session->sid_ctx_length
590                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
591                 {
592                 al=SSL_AD_ILLEGAL_PARAMETER;
593                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
594                 goto f_err;
595                 }
596             s->hit=1;
597             }
598         else    /* a miss or crap from the other end */
599                 {
600                 /* If we were trying for session-id reuse, make a new
601                  * SSL_SESSION so we don't stuff up other people */
602                 s->hit=0;
603                 if (s->session->session_id_length > 0)
604                         {
605                         if (!ssl_get_new_session(s,0))
606                                 {
607                                 al=SSL_AD_INTERNAL_ERROR;
608                                 goto f_err;
609                                 }
610                         }
611                 s->session->session_id_length=j;
612                 memcpy(s->session->session_id,p,j); /* j could be 0 */
613                 }
614         p+=j;
615         c=ssl_get_cipher_by_char(s,p);
616         if (c == NULL)
617                 {
618                 /* unknown cipher */
619                 al=SSL_AD_ILLEGAL_PARAMETER;
620                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
621                 goto f_err;
622                 }
623         p+=ssl_put_cipher_by_char(s,NULL,NULL);
624
625         sk=ssl_get_ciphers_by_id(s);
626         i=sk_SSL_CIPHER_find(sk,c);
627         if (i < 0)
628                 {
629                 /* we did not say we would use this cipher */
630                 al=SSL_AD_ILLEGAL_PARAMETER;
631                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
632                 goto f_err;
633                 }
634
635         if (s->hit && (s->session->cipher != c))
636                 {
637                 if (!(s->options &
638                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
639                         {
640                         al=SSL_AD_ILLEGAL_PARAMETER;
641                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
642                         goto f_err;
643                         }
644                 }
645         s->s3->tmp.new_cipher=c;
646
647         /* lets get the compression algorithm */
648         /* COMPRESSION */
649         j= *(p++);
650         if (j == 0)
651                 comp=NULL;
652         else
653                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
654         
655         if ((j != 0) && (comp == NULL))
656                 {
657                 al=SSL_AD_ILLEGAL_PARAMETER;
658                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
659                 goto f_err;
660                 }
661         else
662                 {
663                 s->s3->tmp.new_compression=comp;
664                 }
665
666         if (p != (d+n))
667                 {
668                 /* wrong packet length */
669                 al=SSL_AD_DECODE_ERROR;
670                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
671                 goto err;
672                 }
673
674         return(1);
675 f_err:
676         ssl3_send_alert(s,SSL3_AL_FATAL,al);
677 err:
678         return(-1);
679         }
680
681 static int ssl3_get_server_certificate(SSL *s)
682         {
683         int al,i,ok,ret= -1;
684         unsigned long n,nc,llen,l;
685         X509 *x=NULL;
686         unsigned char *p,*d,*q;
687         STACK_OF(X509) *sk=NULL;
688         SESS_CERT *sc;
689         EVP_PKEY *pkey=NULL;
690
691         n=ssl3_get_message(s,
692                 SSL3_ST_CR_CERT_A,
693                 SSL3_ST_CR_CERT_B,
694                 -1,
695 #if defined(MSDOS) && !defined(WIN32)
696                 1024*30, /* 30k max cert list :-) */
697 #else
698                 1024*100, /* 100k max cert list :-) */
699 #endif
700                 &ok);
701
702         if (!ok) return((int)n);
703
704         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
705                 {
706                 s->s3->tmp.reuse_message=1;
707                 return(1);
708                 }
709
710         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
711                 {
712                 al=SSL_AD_UNEXPECTED_MESSAGE;
713                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
714                 goto f_err;
715                 }
716         d=p=(unsigned char *)s->init_buf->data;
717
718         if ((sk=sk_X509_new_null()) == NULL)
719                 {
720                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
721                 goto err;
722                 }
723
724         n2l3(p,llen);
725         if (llen+3 != n)
726                 {
727                 al=SSL_AD_DECODE_ERROR;
728                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
729                 goto f_err;
730                 }
731         for (nc=0; nc<llen; )
732                 {
733                 n2l3(p,l);
734                 if ((l+nc+3) > llen)
735                         {
736                         al=SSL_AD_DECODE_ERROR;
737                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
738                         goto f_err;
739                         }
740
741                 q=p;
742                 x=d2i_X509(NULL,&q,l);
743                 if (x == NULL)
744                         {
745                         al=SSL_AD_BAD_CERTIFICATE;
746                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
747                         goto f_err;
748                         }
749                 if (q != (p+l))
750                         {
751                         al=SSL_AD_DECODE_ERROR;
752                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
753                         goto f_err;
754                         }
755                 if (!sk_X509_push(sk,x))
756                         {
757                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
758                         goto err;
759                         }
760                 x=NULL;
761                 nc+=l+3;
762                 p=q;
763                 }
764
765         i=ssl_verify_cert_chain(s,sk);
766         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
767                 {
768                 al=ssl_verify_alarm_type(s->verify_result);
769                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
770                 goto f_err; 
771                 }
772         ERR_clear_error(); /* but we keep s->verify_result */
773
774         sc=ssl_sess_cert_new();
775         if (sc == NULL) goto err;
776
777         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
778         s->session->sess_cert=sc;
779
780         sc->cert_chain=sk;
781         /* Inconsistency alert: cert_chain does include the peer's
782          * certificate, which we don't include in s3_srvr.c */
783         x=sk_X509_value(sk,0);
784         sk=NULL;
785
786         pkey=X509_get_pubkey(x);
787
788         if ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))
789                 {
790                 x=NULL;
791                 al=SSL3_AL_FATAL;
792                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
793                 goto f_err;
794                 }
795
796         i=ssl_cert_type(x,pkey);
797         if (i < 0)
798                 {
799                 x=NULL;
800                 al=SSL3_AL_FATAL;
801                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_UNKNOWN_CERTIFICATE_TYPE);
802                 goto f_err;
803                 }
804
805         sc->peer_cert_type=i;
806         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
807         if (sc->peer_pkeys[i].x509 != NULL) /* Why would this ever happen?
808                                                                                  * We just created sc a couple of
809                                                                                  * lines ago. */
810                 X509_free(sc->peer_pkeys[i].x509);
811         sc->peer_pkeys[i].x509=x;
812         sc->peer_key= &(sc->peer_pkeys[i]);
813
814         if (s->session->peer != NULL)
815                 X509_free(s->session->peer);
816         CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
817         s->session->peer=x;
818         s->session->verify_result = s->verify_result;
819
820         x=NULL;
821         ret=1;
822
823         if (0)
824                 {
825 f_err:
826                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
827                 }
828 err:
829         EVP_PKEY_free(pkey);
830         X509_free(x);
831         sk_X509_pop_free(sk,X509_free);
832         return(ret);
833         }
834
835 static int ssl3_get_key_exchange(SSL *s)
836         {
837 #ifndef NO_RSA
838         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
839 #endif
840         EVP_MD_CTX md_ctx;
841         unsigned char *param,*p;
842         int al,i,j,param_len,ok;
843         long n,alg;
844         EVP_PKEY *pkey=NULL;
845 #ifndef NO_RSA
846         RSA *rsa=NULL;
847 #endif
848 #ifndef NO_DH
849         DH *dh=NULL;
850 #endif
851
852         n=ssl3_get_message(s,
853                 SSL3_ST_CR_KEY_EXCH_A,
854                 SSL3_ST_CR_KEY_EXCH_B,
855                 -1,
856                 1024*8, /* ?? */
857                 &ok);
858
859         if (!ok) return((int)n);
860
861         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
862                 {
863                 s->s3->tmp.reuse_message=1;
864                 return(1);
865                 }
866
867         param=p=(unsigned char *)s->init_buf->data;
868
869         if (s->session->sess_cert != NULL)
870                 {
871 #ifndef NO_RSA
872                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
873                         {
874                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
875                         s->session->sess_cert->peer_rsa_tmp=NULL;
876                         }
877 #endif
878 #ifndef NO_DH
879                 if (s->session->sess_cert->peer_dh_tmp)
880                         {
881                         DH_free(s->session->sess_cert->peer_dh_tmp);
882                         s->session->sess_cert->peer_dh_tmp=NULL;
883                         }
884 #endif
885                 }
886         else
887                 {
888                 s->session->sess_cert=ssl_sess_cert_new();
889                 }
890
891         param_len=0;
892         alg=s->s3->tmp.new_cipher->algorithms;
893
894 #ifndef NO_RSA
895         if (alg & SSL_kRSA)
896                 {
897                 if ((rsa=RSA_new()) == NULL)
898                         {
899                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
900                         goto err;
901                         }
902                 n2s(p,i);
903                 param_len=i+2;
904                 if (param_len > n)
905                         {
906                         al=SSL_AD_DECODE_ERROR;
907                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
908                         goto f_err;
909                         }
910                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
911                         {
912                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
913                         goto err;
914                         }
915                 p+=i;
916
917                 n2s(p,i);
918                 param_len+=i+2;
919                 if (param_len > n)
920                         {
921                         al=SSL_AD_DECODE_ERROR;
922                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
923                         goto f_err;
924                         }
925                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
926                         {
927                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
928                         goto err;
929                         }
930                 p+=i;
931                 n-=param_len;
932
933                 /* this should be because we are using an export cipher */
934                 if (alg & SSL_aRSA)
935                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
936                 else
937                         {
938                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
939                         goto err;
940                         }
941                 s->session->sess_cert->peer_rsa_tmp=rsa;
942                 rsa=NULL;
943                 }
944 #else /* NO_RSA */
945         if (0)
946                 ;
947 #endif
948 #ifndef NO_DH
949         else if (alg & SSL_kEDH)
950                 {
951                 if ((dh=DH_new()) == NULL)
952                         {
953                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
954                         goto err;
955                         }
956                 n2s(p,i);
957                 param_len=i+2;
958                 if (param_len > n)
959                         {
960                         al=SSL_AD_DECODE_ERROR;
961                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
962                         goto f_err;
963                         }
964                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
965                         {
966                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
967                         goto err;
968                         }
969                 p+=i;
970
971                 n2s(p,i);
972                 param_len+=i+2;
973                 if (param_len > n)
974                         {
975                         al=SSL_AD_DECODE_ERROR;
976                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
977                         goto f_err;
978                         }
979                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
980                         {
981                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
982                         goto err;
983                         }
984                 p+=i;
985
986                 n2s(p,i);
987                 param_len+=i+2;
988                 if (param_len > n)
989                         {
990                         al=SSL_AD_DECODE_ERROR;
991                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
992                         goto f_err;
993                         }
994                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
995                         {
996                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
997                         goto err;
998                         }
999                 p+=i;
1000                 n-=param_len;
1001
1002 #ifndef NO_RSA
1003                 if (alg & SSL_aRSA)
1004                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1005 #else
1006                 if (0)
1007                         ;
1008 #endif
1009 #ifndef NO_DSA
1010                 else if (alg & SSL_aDSS)
1011                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1012 #endif
1013                 /* else anonymous DH, so no certificate or pkey. */
1014
1015                 s->session->sess_cert->peer_dh_tmp=dh;
1016                 dh=NULL;
1017                 }
1018         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1019                 {
1020                 al=SSL_AD_ILLEGAL_PARAMETER;
1021                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1022                 goto f_err;
1023                 }
1024 #endif /* !NO_DH */
1025         if (alg & SSL_aFZA)
1026                 {
1027                 al=SSL_AD_HANDSHAKE_FAILURE;
1028                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1029                 goto f_err;
1030                 }
1031
1032
1033         /* p points to the next byte, there are 'n' bytes left */
1034
1035
1036         /* if it was signed, check the signature */
1037         if (pkey != NULL)
1038                 {
1039                 n2s(p,i);
1040                 n-=2;
1041                 j=EVP_PKEY_size(pkey);
1042
1043                 if ((i != n) || (n > j) || (n <= 0))
1044                         {
1045                         /* wrong packet length */
1046                         al=SSL_AD_DECODE_ERROR;
1047                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1048                         goto f_err;
1049                         }
1050
1051 #ifndef NO_RSA
1052                 if (pkey->type == EVP_PKEY_RSA)
1053                         {
1054                         int num;
1055
1056                         j=0;
1057                         q=md_buf;
1058                         for (num=2; num > 0; num--)
1059                                 {
1060                                 EVP_DigestInit(&md_ctx,(num == 2)
1061                                         ?s->ctx->md5:s->ctx->sha1);
1062                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1063                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1064                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1065                                 EVP_DigestFinal(&md_ctx,q,(unsigned int *)&i);
1066                                 q+=i;
1067                                 j+=i;
1068                                 }
1069                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1070                                                                 pkey->pkey.rsa);
1071                         if (i < 0)
1072                                 {
1073                                 al=SSL_AD_DECRYPT_ERROR;
1074                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1075                                 goto f_err;
1076                                 }
1077                         if (i == 0)
1078                                 {
1079                                 /* bad signature */
1080                                 al=SSL_AD_DECRYPT_ERROR;
1081                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1082                                 goto f_err;
1083                                 }
1084                         }
1085                 else
1086 #endif
1087 #ifndef NO_DSA
1088                         if (pkey->type == EVP_PKEY_DSA)
1089                         {
1090                         /* lets do DSS */
1091                         EVP_VerifyInit(&md_ctx,EVP_dss1());
1092                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1093                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1094                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1095                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1096                                 {
1097                                 /* bad signature */
1098                                 al=SSL_AD_DECRYPT_ERROR;
1099                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1100                                 goto f_err;
1101                                 }
1102                         }
1103                 else
1104 #endif
1105                         {
1106                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1107                         goto err;
1108                         }
1109                 }
1110         else
1111                 {
1112                 /* still data left over */
1113                 if (!(alg & SSL_aNULL))
1114                         {
1115                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1116                         goto err;
1117                         }
1118                 if (n != 0)
1119                         {
1120                         al=SSL_AD_DECODE_ERROR;
1121                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1122                         goto f_err;
1123                         }
1124                 }
1125         EVP_PKEY_free(pkey);
1126         return(1);
1127 f_err:
1128         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1129 err:
1130         EVP_PKEY_free(pkey);
1131 #ifndef NO_RSA
1132         if (rsa != NULL)
1133                 RSA_free(rsa);
1134 #endif
1135 #ifndef NO_DH
1136         if (dh != NULL)
1137                 DH_free(dh);
1138 #endif
1139         return(-1);
1140         }
1141
1142 static int ssl3_get_certificate_request(SSL *s)
1143         {
1144         int ok,ret=0;
1145         unsigned long n,nc,l;
1146         unsigned int llen,ctype_num,i;
1147         X509_NAME *xn=NULL;
1148         unsigned char *p,*d,*q;
1149         STACK_OF(X509_NAME) *ca_sk=NULL;
1150
1151         n=ssl3_get_message(s,
1152                 SSL3_ST_CR_CERT_REQ_A,
1153                 SSL3_ST_CR_CERT_REQ_B,
1154                 -1,
1155 #if defined(MSDOS) && !defined(WIN32)
1156                 1024*30,  /* 30k max cert list :-) */
1157 #else
1158                 1024*100, /* 100k max cert list :-) */
1159 #endif
1160                 &ok);
1161
1162         if (!ok) return((int)n);
1163
1164         s->s3->tmp.cert_req=0;
1165
1166         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1167                 {
1168                 s->s3->tmp.reuse_message=1;
1169                 return(1);
1170                 }
1171
1172         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1173                 {
1174                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1175                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1176                 goto err;
1177                 }
1178
1179         /* TLS does not like anon-DH with client cert */
1180         if (s->version > SSL3_VERSION)
1181                 {
1182                 l=s->s3->tmp.new_cipher->algorithms;
1183                 if (l & SSL_aNULL)
1184                         {
1185                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1186                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1187                         goto err;
1188                         }
1189                 }
1190
1191         d=p=(unsigned char *)s->init_buf->data;
1192
1193         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1194                 {
1195                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1196                 goto err;
1197                 }
1198
1199         /* get the certificate types */
1200         ctype_num= *(p++);
1201         if (ctype_num > SSL3_CT_NUMBER)
1202                 ctype_num=SSL3_CT_NUMBER;
1203         for (i=0; i<ctype_num; i++)
1204                 s->s3->tmp.ctype[i]= p[i];
1205         p+=ctype_num;
1206
1207         /* get the CA RDNs */
1208         n2s(p,llen);
1209 #if 0
1210 {
1211 FILE *out;
1212 out=fopen("/tmp/vsign.der","w");
1213 fwrite(p,1,llen,out);
1214 fclose(out);
1215 }
1216 #endif
1217
1218         if ((llen+ctype_num+2+1) != n)
1219                 {
1220                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1221                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1222                 goto err;
1223                 }
1224
1225         for (nc=0; nc<llen; )
1226                 {
1227                 n2s(p,l);
1228                 if ((l+nc+2) > llen)
1229                         {
1230                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1231                                 goto cont; /* netscape bugs */
1232                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1233                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1234                         goto err;
1235                         }
1236
1237                 q=p;
1238
1239                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1240                         {
1241                         /* If netscape tolerance is on, ignore errors */
1242                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1243                                 goto cont;
1244                         else
1245                                 {
1246                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1247                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1248                                 goto err;
1249                                 }
1250                         }
1251
1252                 if (q != (p+l))
1253                         {
1254                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1255                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1256                         goto err;
1257                         }
1258                 if (!sk_X509_NAME_push(ca_sk,xn))
1259                         {
1260                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1261                         goto err;
1262                         }
1263
1264                 p+=l;
1265                 nc+=l+2;
1266                 }
1267
1268         if (0)
1269                 {
1270 cont:
1271                 ERR_clear_error();
1272                 }
1273
1274         /* we should setup a certificate to return.... */
1275         s->s3->tmp.cert_req=1;
1276         s->s3->tmp.ctype_num=ctype_num;
1277         if (s->s3->tmp.ca_names != NULL)
1278                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1279         s->s3->tmp.ca_names=ca_sk;
1280         ca_sk=NULL;
1281
1282         ret=1;
1283 err:
1284         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1285         return(ret);
1286         }
1287
1288 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1289         {
1290         return(X509_NAME_cmp(*a,*b));
1291         }
1292
1293 static int ssl3_get_server_done(SSL *s)
1294         {
1295         int ok,ret=0;
1296         long n;
1297
1298         n=ssl3_get_message(s,
1299                 SSL3_ST_CR_SRVR_DONE_A,
1300                 SSL3_ST_CR_SRVR_DONE_B,
1301                 SSL3_MT_SERVER_DONE,
1302                 30, /* should be very small, like 0 :-) */
1303                 &ok);
1304
1305         if (!ok) return((int)n);
1306         if (n > 0)
1307                 {
1308                 /* should contain no data */
1309                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1310                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1311                 }
1312         ret=1;
1313         return(ret);
1314         }
1315
1316 static int ssl3_send_client_key_exchange(SSL *s)
1317         {
1318         unsigned char *p,*d;
1319         int n;
1320         unsigned long l;
1321 #ifndef NO_RSA
1322         unsigned char *q;
1323         EVP_PKEY *pkey=NULL;
1324 #endif
1325
1326         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1327                 {
1328                 d=(unsigned char *)s->init_buf->data;
1329                 p= &(d[4]);
1330
1331                 l=s->s3->tmp.new_cipher->algorithms;
1332
1333 #ifndef NO_RSA
1334                 if (l & SSL_kRSA)
1335                         {
1336                         RSA *rsa;
1337                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1338
1339                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1340                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1341                         else
1342                                 {
1343                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1344                                 if ((pkey == NULL) ||
1345                                         (pkey->type != EVP_PKEY_RSA) ||
1346                                         (pkey->pkey.rsa == NULL))
1347                                         {
1348                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1349                                         goto err;
1350                                         }
1351                                 rsa=pkey->pkey.rsa;
1352                                 EVP_PKEY_free(pkey);
1353                                 }
1354                                 
1355                         tmp_buf[0]=s->client_version>>8;
1356                         tmp_buf[1]=s->client_version&0xff;
1357                         if (RAND_bytes(&(tmp_buf[2]),SSL_MAX_MASTER_KEY_LENGTH-2) <= 0)
1358                                         goto err;
1359
1360                         s->session->master_key_length=SSL_MAX_MASTER_KEY_LENGTH;
1361
1362                         q=p;
1363                         /* Fix buf for TLS and beyond */
1364                         if (s->version > SSL3_VERSION)
1365                                 p+=2;
1366                         n=RSA_public_encrypt(SSL_MAX_MASTER_KEY_LENGTH,
1367                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1368 #ifdef PKCS1_CHECK
1369                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1370                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1371 #endif
1372                         if (n <= 0)
1373                                 {
1374                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1375                                 goto err;
1376                                 }
1377
1378                         /* Fix buf for TLS and beyond */
1379                         if (s->version > SSL3_VERSION)
1380                                 {
1381                                 s2n(n,q);
1382                                 n+=2;
1383                                 }
1384
1385                         s->session->master_key_length=
1386                                 s->method->ssl3_enc->generate_master_secret(s,
1387                                         s->session->master_key,
1388                                         tmp_buf,SSL_MAX_MASTER_KEY_LENGTH);
1389                         memset(tmp_buf,0,SSL_MAX_MASTER_KEY_LENGTH);
1390                         }
1391                 else
1392 #endif
1393 #ifndef NO_DH
1394                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1395                         {
1396                         DH *dh_srvr,*dh_clnt;
1397
1398                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1399                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1400                         else
1401                                 {
1402                                 /* we get them from the cert */
1403                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1404                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1405                                 goto err;
1406                                 }
1407                         
1408                         /* generate a new random key */
1409                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1410                                 {
1411                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1412                                 goto err;
1413                                 }
1414                         if (!DH_generate_key(dh_clnt))
1415                                 {
1416                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1417                                 goto err;
1418                                 }
1419
1420                         /* use the 'p' output buffer for the DH key, but
1421                          * make sure to clear it out afterwards */
1422
1423                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1424
1425                         if (n <= 0)
1426                                 {
1427                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1428                                 goto err;
1429                                 }
1430
1431                         /* generate master key from the result */
1432                         s->session->master_key_length=
1433                                 s->method->ssl3_enc->generate_master_secret(s,
1434                                         s->session->master_key,p,n);
1435                         /* clean up */
1436                         memset(p,0,n);
1437
1438                         /* send off the data */
1439                         n=BN_num_bytes(dh_clnt->pub_key);
1440                         s2n(n,p);
1441                         BN_bn2bin(dh_clnt->pub_key,p);
1442                         n+=2;
1443
1444                         DH_free(dh_clnt);
1445
1446                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1447                         }
1448                 else
1449 #endif
1450                         {
1451                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1452                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_INTERNAL_ERROR);
1453                         goto err;
1454                         }
1455                 
1456                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1457                 l2n3(n,d);
1458
1459                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1460                 /* number of bytes to write */
1461                 s->init_num=n+4;
1462                 s->init_off=0;
1463                 }
1464
1465         /* SSL3_ST_CW_KEY_EXCH_B */
1466         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1467 err:
1468         return(-1);
1469         }
1470
1471 static int ssl3_send_client_verify(SSL *s)
1472         {
1473         unsigned char *p,*d;
1474         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1475         EVP_PKEY *pkey;
1476 #ifndef NO_RSA
1477         unsigned u=0;
1478 #endif
1479         unsigned long n;
1480 #ifndef NO_DSA
1481         int j;
1482 #endif
1483
1484         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1485                 {
1486                 d=(unsigned char *)s->init_buf->data;
1487                 p= &(d[4]);
1488                 pkey=s->cert->key->privatekey;
1489
1490                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1491                         &(data[MD5_DIGEST_LENGTH]));
1492
1493 #ifndef NO_RSA
1494                 if (pkey->type == EVP_PKEY_RSA)
1495                         {
1496                         s->method->ssl3_enc->cert_verify_mac(s,
1497                                 &(s->s3->finish_dgst1),&(data[0]));
1498                         if (RSA_sign(NID_md5_sha1, data,
1499                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1500                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1501                                 {
1502                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1503                                 goto err;
1504                                 }
1505                         s2n(u,p);
1506                         n=u+2;
1507                         }
1508                 else
1509 #endif
1510 #ifndef NO_DSA
1511                         if (pkey->type == EVP_PKEY_DSA)
1512                         {
1513                         if (!DSA_sign(pkey->save_type,
1514                                 &(data[MD5_DIGEST_LENGTH]),
1515                                 SHA_DIGEST_LENGTH,&(p[2]),
1516                                 (unsigned int *)&j,pkey->pkey.dsa))
1517                                 {
1518                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1519                                 goto err;
1520                                 }
1521                         s2n(j,p);
1522                         n=j+2;
1523                         }
1524                 else
1525 #endif
1526                         {
1527                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,SSL_R_INTERNAL_ERROR);
1528                         goto err;
1529                         }
1530                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
1531                 l2n3(n,d);
1532
1533                 s->init_num=(int)n+4;
1534                 s->init_off=0;
1535                 }
1536         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1537 err:
1538         return(-1);
1539         }
1540
1541 static int ssl3_send_client_certificate(SSL *s)
1542         {
1543         X509 *x509=NULL;
1544         EVP_PKEY *pkey=NULL;
1545         int i;
1546         unsigned long l;
1547
1548         if (s->state == SSL3_ST_CW_CERT_A)
1549                 {
1550                 if ((s->cert == NULL) ||
1551                         (s->cert->key->x509 == NULL) ||
1552                         (s->cert->key->privatekey == NULL))
1553                         s->state=SSL3_ST_CW_CERT_B;
1554                 else
1555                         s->state=SSL3_ST_CW_CERT_C;
1556                 }
1557
1558         /* We need to get a client cert */
1559         if (s->state == SSL3_ST_CW_CERT_B)
1560                 {
1561                 /* If we get an error, we need to
1562                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1563                  * We then get retied later */
1564                 i=0;
1565                 if (s->ctx->client_cert_cb != NULL)
1566                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1567                 if (i < 0)
1568                         {
1569                         s->rwstate=SSL_X509_LOOKUP;
1570                         return(-1);
1571                         }
1572                 s->rwstate=SSL_NOTHING;
1573                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1574                         {
1575                         s->state=SSL3_ST_CW_CERT_B;
1576                         if (    !SSL_use_certificate(s,x509) ||
1577                                 !SSL_use_PrivateKey(s,pkey))
1578                                 i=0;
1579                         }
1580                 else if (i == 1)
1581                         {
1582                         i=0;
1583                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1584                         }
1585
1586                 if (x509 != NULL) X509_free(x509);
1587                 if (pkey != NULL) EVP_PKEY_free(pkey);
1588                 if (i == 0)
1589                         {
1590                         if (s->version == SSL3_VERSION)
1591                                 {
1592                                 s->s3->tmp.cert_req=0;
1593                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1594                                 return(1);
1595                                 }
1596                         else
1597                                 {
1598                                 s->s3->tmp.cert_req=2;
1599                                 }
1600                         }
1601
1602                 /* Ok, we have a cert */
1603                 s->state=SSL3_ST_CW_CERT_C;
1604                 }
1605
1606         if (s->state == SSL3_ST_CW_CERT_C)
1607                 {
1608                 s->state=SSL3_ST_CW_CERT_D;
1609                 l=ssl3_output_cert_chain(s,
1610                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1611                 s->init_num=(int)l;
1612                 s->init_off=0;
1613                 }
1614         /* SSL3_ST_CW_CERT_D */
1615         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1616         }
1617
1618 #define has_bits(i,m)   (((i)&(m)) == (m))
1619
1620 static int ssl3_check_cert_and_algorithm(SSL *s)
1621         {
1622         int i,idx;
1623         long algs;
1624         EVP_PKEY *pkey=NULL;
1625         SESS_CERT *sc;
1626 #ifndef NO_RSA
1627         RSA *rsa;
1628 #endif
1629 #ifndef NO_DH
1630         DH *dh;
1631 #endif
1632
1633         sc=s->session->sess_cert;
1634
1635         if (sc == NULL)
1636                 {
1637                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_INTERNAL_ERROR);
1638                 goto err;
1639                 }
1640
1641         algs=s->s3->tmp.new_cipher->algorithms;
1642
1643         /* we don't have a certificate */
1644         if (algs & (SSL_aDH|SSL_aNULL))
1645                 return(1);
1646
1647 #ifndef NO_RSA
1648         rsa=s->session->sess_cert->peer_rsa_tmp;
1649 #endif
1650 #ifndef NO_DH
1651         dh=s->session->sess_cert->peer_dh_tmp;
1652 #endif
1653
1654         /* This is the passed certificate */
1655
1656         idx=sc->peer_cert_type;
1657         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
1658         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
1659         EVP_PKEY_free(pkey);
1660
1661         
1662         /* Check that we have a certificate if we require one */
1663         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
1664                 {
1665                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
1666                 goto f_err;
1667                 }
1668 #ifndef NO_DSA
1669         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
1670                 {
1671                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
1672                 goto f_err;
1673                 }
1674 #endif
1675 #ifndef NO_RSA
1676         if ((algs & SSL_kRSA) &&
1677                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
1678                 {
1679                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
1680                 goto f_err;
1681                 }
1682 #endif
1683 #ifndef NO_DH
1684         if ((algs & SSL_kEDH) &&
1685                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
1686                 {
1687                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
1688                 goto f_err;
1689                 }
1690         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
1691                 {
1692                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
1693                 goto f_err;
1694                 }
1695 #ifndef NO_DSA
1696         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
1697                 {
1698                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
1699                 goto f_err;
1700                 }
1701 #endif
1702 #endif
1703
1704         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
1705                 {
1706 #ifndef NO_RSA
1707                 if (algs & SSL_kRSA)
1708                         {
1709                         if (rsa == NULL
1710                             || RSA_size(rsa) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1711                                 {
1712                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
1713                                 goto f_err;
1714                                 }
1715                         }
1716                 else
1717 #endif
1718 #ifndef NO_DH
1719                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1720                             {
1721                             if (dh == NULL
1722                                 || DH_size(dh) > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
1723                                 {
1724                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
1725                                 goto f_err;
1726                                 }
1727                         }
1728                 else
1729 #endif
1730                         {
1731                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1732                         goto f_err;
1733                         }
1734                 }
1735         return(1);
1736 f_err:
1737         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1738 err:
1739         return(0);
1740         }
1741