0c138420145a9d52a8adcac17ee8e18827916a47
[openssl.git] / ssl / s2_clnt.c
1 /* ssl/s2_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 "rand.h"
61 #include "buffer.h"
62 #include "objects.h"
63 #include "ssl_locl.h"
64 #include "evp.h"
65
66 #ifndef NOPROTO
67 static SSL_METHOD *ssl2_get_client_method(int ver);
68 static int get_server_finished(SSL *s);
69 static int get_server_verify(SSL *s);
70 static int get_server_hello(SSL *s);
71 static int client_hello(SSL *s); 
72 static int client_master_key(SSL *s);
73 static int client_finished(SSL *s);
74 static int client_certificate(SSL *s);
75 static int ssl_rsa_public_encrypt(CERT *c, int len, unsigned char *from,
76         unsigned char *to,int padding);
77 #else
78 static SSL_METHOD *ssl2_get_client_method();
79 static int get_server_finished();
80 static int get_server_verify();
81 static int get_server_hello();
82 static int client_hello(); 
83 static int client_master_key();
84 static int client_finished();
85 static int client_certificate();
86 static int ssl_rsa_public_encrypt();
87 #endif
88
89 #define BREAK   break
90
91 static SSL_METHOD *ssl2_get_client_method(ver)
92 int ver;
93         {
94         if (ver == SSL2_VERSION)
95                 return(SSLv2_client_method());
96         else
97                 return(NULL);
98         }
99
100 SSL_METHOD *SSLv2_client_method()
101         {
102         static int init=1;
103         static SSL_METHOD SSLv2_client_data;
104
105         if (init)
106                 {
107                 init=0;
108                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
109                         sizeof(SSL_METHOD));
110                 SSLv2_client_data.ssl_connect=ssl2_connect;
111                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
112                 }
113         return(&SSLv2_client_data);
114         }
115
116 int ssl2_connect(s)
117 SSL *s;
118         {
119         unsigned long l=time(NULL);
120         BUF_MEM *buf=NULL;
121         int ret= -1;
122         void (*cb)()=NULL;
123         int new_state,state;
124
125         RAND_seed(&l,sizeof(l));
126         ERR_clear_error();
127         clear_sys_error();
128
129         if (s->info_callback != NULL)
130                 cb=s->info_callback;
131         else if (s->ctx->info_callback != NULL)
132                 cb=s->ctx->info_callback;
133
134         /* init things to blank */
135         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
136         s->in_handshake++;
137
138         for (;;)
139                 {
140                 state=s->state;
141
142                 switch (s->state)
143                         {
144                 case SSL_ST_BEFORE:
145                 case SSL_ST_CONNECT:
146                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
147                 case SSL_ST_OK|SSL_ST_CONNECT:
148
149                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
150
151                         s->version=SSL2_VERSION;
152                         s->type=SSL_ST_CONNECT;
153
154                         buf=s->init_buf;
155                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
156                                 {
157                                 ret= -1;
158                                 goto end;
159                                 }
160                         if (!BUF_MEM_grow(buf,
161                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
162                                 {
163                                 ret= -1;
164                                 goto end;
165                                 }
166                         s->init_buf=buf;
167                         s->init_num=0;
168                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
169                         s->ctx->sess_connect++;
170                         s->handshake_func=ssl2_connect;
171                         BREAK;
172
173                 case SSL2_ST_SEND_CLIENT_HELLO_A:
174                 case SSL2_ST_SEND_CLIENT_HELLO_B:
175                         s->shutdown=0;
176                         ret=client_hello(s);
177                         if (ret <= 0) goto end;
178                         s->init_num=0;
179                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
180                         BREAK;
181                 
182                 case SSL2_ST_GET_SERVER_HELLO_A:
183                 case SSL2_ST_GET_SERVER_HELLO_B:
184                         ret=get_server_hello(s);
185                         if (ret <= 0) goto end;
186                         s->init_num=0;
187                         if (!s->hit) /* new session */
188                                 {
189                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
190                                 BREAK; 
191                                 }
192                         else
193                                 {
194                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
195                                 break;
196                                 }
197         
198                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
199                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
200                         ret=client_master_key(s);
201                         if (ret <= 0) goto end;
202                         s->init_num=0;
203                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
204                         break;
205
206                 case SSL2_ST_CLIENT_START_ENCRYPTION:
207                         /* Ok, we now have all the stuff needed to
208                          * start encrypting, so lets fire it up :-) */
209                         if (!ssl2_enc_init(s,1))
210                                 {
211                                 ret= -1;
212                                 goto end;
213                                 }
214                         s->s2->clear_text=0;
215                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
216                         break;
217
218                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
219                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
220                         ret=client_finished(s);
221                         if (ret <= 0) goto end;
222                         s->init_num=0;
223                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
224                         break;
225
226                 case SSL2_ST_GET_SERVER_VERIFY_A:
227                 case SSL2_ST_GET_SERVER_VERIFY_B:
228                         ret=get_server_verify(s);
229                         if (ret <= 0) goto end;
230                         s->init_num=0;
231                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
232                         break;
233
234                 case SSL2_ST_GET_SERVER_FINISHED_A:
235                 case SSL2_ST_GET_SERVER_FINISHED_B:
236                         ret=get_server_finished(s);
237                         if (ret <= 0) goto end;
238                         break;
239
240                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
241                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
242                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
243                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
244                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
245                         ret=client_certificate(s);
246                         if (ret <= 0) goto end;
247                         s->init_num=0;
248                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
249                         break;
250
251                 case SSL_ST_OK:
252                         BUF_MEM_free(s->init_buf);
253                         s->init_buf=NULL;
254                         s->init_num=0;
255                 /*      ERR_clear_error();*/
256
257                         /* If we want to cache session-ids in the client
258                          * and we sucessfully add the session-id to the
259                          * cache, and there is a callback, then pass it out.
260                          * 26/11/96 - eay - only add if not a re-used session.
261                          */
262
263                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
264                         if (s->hit) s->ctx->sess_hit++;
265
266                         ret=1;
267                         /* s->server=0; */
268                         s->ctx->sess_connect_good++;
269
270                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
271
272                         goto end;
273                         /* break; */
274                 default:
275                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
276                         return(-1);
277                         /* break; */
278                         }
279
280                 if ((cb != NULL) && (s->state != state))
281                         {
282                         new_state=s->state;
283                         s->state=state;
284                         cb(s,SSL_CB_CONNECT_LOOP,1);
285                         s->state=new_state;
286                         }
287                 }
288 end:
289         s->in_handshake--;
290         if (cb != NULL) 
291                 cb(s,SSL_CB_CONNECT_EXIT,ret);
292         return(ret);
293         }
294
295 static int get_server_hello(s)
296 SSL *s;
297         {
298         unsigned char *buf;
299         unsigned char *p;
300         int i,j;
301         STACK *sk=NULL,*cl;
302
303         buf=(unsigned char *)s->init_buf->data;
304         p=buf;
305         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
306                 {
307                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
308                 if (i < (11-s->init_num)) 
309                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
310
311                 if (*(p++) != SSL2_MT_SERVER_HELLO)
312                         {
313                         if (p[-1] != SSL2_MT_ERROR)
314                                 {
315                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
316                                 SSLerr(SSL_F_GET_SERVER_HELLO,
317                                         SSL_R_READ_WRONG_PACKET_TYPE);
318                                 }
319                         else
320                                 SSLerr(SSL_F_GET_SERVER_HELLO,
321                                         SSL_R_PEER_ERROR);
322                         return(-1);
323                         }
324                 s->hit=(*(p++))?1:0;
325                 s->s2->tmp.cert_type= *(p++);
326                 n2s(p,i);
327                 if (i < s->version) s->version=i;
328                 n2s(p,i); s->s2->tmp.cert_length=i;
329                 n2s(p,i); s->s2->tmp.csl=i;
330                 n2s(p,i); s->s2->tmp.conn_id_length=i;
331                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
332                 s->init_num=0;
333                 }
334
335         /* SSL2_ST_GET_SERVER_HELLO_B */
336         j=s->s2->tmp.cert_length+s->s2->tmp.csl+s->s2->tmp.conn_id_length
337                 - s->init_num;
338         i=ssl2_read(s,(char *)&(buf[s->init_num]),j);
339         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
340
341         /* things are looking good */
342
343         p=buf;
344         if (s->hit)
345                 {
346                 if (s->s2->tmp.cert_length != 0) 
347                         {
348                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
349                         return(-1);
350                         }
351                 if (s->s2->tmp.cert_type != 0)
352                         {
353                         if (!(s->options &
354                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
355                                 {
356                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
357                                 return(-1);
358                                 }
359                         }
360                 if (s->s2->tmp.csl != 0)
361                         {
362                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
363                         return(-1);
364                         }
365                 }
366         else
367                 {
368 #ifdef undef
369                 /* very bad */
370                 memset(s->session->session_id,0,
371                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
372                 s->session->session_id_length=0;
373                 */
374 #endif
375
376                 /* we need to do this incase we were trying to reuse a 
377                  * client session but others are already reusing it.
378                  * If this was a new 'blank' session ID, the session-id
379                  * length will still be 0 */
380                 if (s->session->session_id_length > 0)
381                         {
382                         if (!ssl_get_new_session(s,0))
383                                 {
384                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
385                                 return(-1);
386                                 }
387                         }
388
389                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
390                         s->s2->tmp.cert_length,p) <= 0)
391                         {
392                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
393                         return(-1);
394                         }
395                 p+=s->s2->tmp.cert_length;
396
397                 if (s->s2->tmp.csl == 0)
398                         {
399                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
400                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
401                         return(-1);
402                         }
403
404                 /* We have just received a list of ciphers back from the
405                  * server.  We need to get the ones that match, then select
406                  * the one we want the most :-). */
407
408                 /* load the ciphers */
409                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
410                         &s->session->ciphers);
411                 p+=s->s2->tmp.csl;
412                 if (sk == NULL)
413                         {
414                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
415                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
416                         return(-1);
417                         }
418
419                 sk_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
420
421                 /* get the array of ciphers we will accept */
422                 cl=ssl_get_ciphers_by_id(s);
423
424                 /* In theory we could have ciphers sent back that we
425                  * don't want to use but that does not matter since we
426                  * will check against the list we origionally sent and
427                  * for performance reasons we should not bother to match
428                  * the two lists up just to check. */
429                 for (i=0; i<sk_num(cl); i++)
430                         {
431                         if (sk_find(sk,sk_value(cl,i)) >= 0)
432                                 break;
433                         }
434
435                 if (i >= sk_num(cl))
436                         {
437                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
438                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
439                         return(-1);
440                         }
441                 s->session->cipher=(SSL_CIPHER *)sk_value(cl,i);
442                 }
443
444         if ((s->session != NULL) && (s->session->peer != NULL))
445                 X509_free(s->session->peer);
446
447         /* hmmm, can we have the problem of the other session with this
448          * cert, Free's it before we increment the reference count. */
449         CRYPTO_w_lock(CRYPTO_LOCK_X509);
450         s->session->peer=s->session->cert->key->x509;
451         CRYPTO_add(&s->session->peer->references,1,CRYPTO_LOCK_X509);
452         CRYPTO_w_unlock(CRYPTO_LOCK_X509);
453
454         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
455         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
456         return(1);
457         }
458
459 static int client_hello(s)
460 SSL *s;
461         {
462         unsigned char *buf;
463         unsigned char *p,*d;
464 /*      CIPHER **cipher;*/
465         int i,n,j;
466
467         buf=(unsigned char *)s->init_buf->data;
468         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
469                 {
470                 if ((s->session == NULL) ||
471                         (s->session->ssl_version != s->version))
472                         {
473                         if (!ssl_get_new_session(s,0))
474                                 {
475                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
476                                 return(-1);
477                                 }
478                         }
479                 /* else use the pre-loaded session */
480
481                 p=buf;                                  /* header */
482                 d=p+9;                                  /* data section */
483                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
484                 s2n(SSL2_CLIENT_VERSION,p);             /* version */
485                 n=j=0;
486
487                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
488                 d+=n;
489
490                 if (n == 0)
491                         {
492                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
493                         return(-1);
494                         }
495
496                 s2n(n,p);                       /* cipher spec num bytes */
497
498                 if ((s->session->session_id_length > 0) &&
499                         (s->session->session_id_length <=
500                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
501                         {
502                         i=s->session->session_id_length;
503                         s2n(i,p);               /* session id length */
504                         memcpy(d,s->session->session_id,(unsigned int)i);
505                         d+=i;
506                         }
507                 else
508                         {
509                         s2n(0,p);
510                         }
511
512                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
513                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
514                 /*challenge id data*/
515                 RAND_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
516                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
517                 d+=SSL2_CHALLENGE_LENGTH;
518
519                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
520                 s->init_num=d-buf;
521                 s->init_off=0;
522                 }
523         /* SSL2_ST_SEND_CLIENT_HELLO_B */
524         return(ssl2_do_write(s));
525         }
526
527 static int client_master_key(s)
528 SSL *s;
529         {
530         unsigned char *buf;
531         unsigned char *p,*d;
532         int clear,enc,karg,i;
533         SSL_SESSION *sess;
534         EVP_CIPHER *c;
535         EVP_MD *md;
536
537         buf=(unsigned char *)s->init_buf->data;
538         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
539                 {
540
541                 if (!ssl_cipher_get_evp(s->session->cipher,&c,&md))
542                         {
543                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
544                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
545                         return(-1);
546                         }
547                 sess=s->session;
548                 p=buf;
549                 d=p+10;
550                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
551
552                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
553                 p+=i;
554
555                 /* make key_arg data */
556                 i=EVP_CIPHER_iv_length(c);
557                 sess->key_arg_length=i;
558                 if (i > 0) RAND_bytes(sess->key_arg,i);
559
560                 /* make a master key */
561                 i=EVP_CIPHER_key_length(c);
562                 sess->master_key_length=i;
563                 if (i > 0) RAND_bytes(sess->master_key,i);
564
565                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
566                         enc=8;
567                 else if (sess->cipher->algorithms & SSL_EXP)
568                         enc=5;
569                 else
570                         enc=i;
571
572                 if (i < enc)
573                         {
574                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
575                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
576                         return(-1);
577                         }
578                 clear=i-enc;
579                 s2n(clear,p);
580                 memcpy(d,sess->master_key,(unsigned int)clear);
581                 d+=clear;
582
583                 enc=ssl_rsa_public_encrypt(sess->cert,enc,
584                         &(sess->master_key[clear]),d,
585                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
586                 if (enc <= 0)
587                         {
588                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
589                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
590                         return(-1);
591                         }
592 #ifdef PKCS1_CHECK
593                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
594                 if (s->options & SSL_OP_PKCS1_CHECK_2)
595                         sess->master_key[clear]++;
596 #endif
597                 s2n(enc,p);
598                 d+=enc;
599                 karg=sess->key_arg_length;      
600                 s2n(karg,p); /* key arg size */
601                 memcpy(d,sess->key_arg,(unsigned int)karg);
602                 d+=karg;
603
604                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
605                 s->init_num=d-buf;
606                 s->init_off=0;
607                 }
608
609         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
610         return(ssl2_do_write(s));
611         }
612
613 static int client_finished(s)
614 SSL *s;
615         {
616         unsigned char *p;
617
618         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
619                 {
620                 p=(unsigned char *)s->init_buf->data;
621                 *(p++)=SSL2_MT_CLIENT_FINISHED;
622                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
623
624                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
625                 s->init_num=s->s2->conn_id_length+1;
626                 s->init_off=0;
627                 }
628         return(ssl2_do_write(s));
629         }
630
631 /* read the data and then respond */
632 static int client_certificate(s)
633 SSL *s;
634         {
635         unsigned char *buf;
636         unsigned char *p,*d;
637         int i;
638         unsigned int n;
639         int cert_ch_len=0;
640         unsigned char *cert_ch;
641
642         buf=(unsigned char *)s->init_buf->data;
643         cert_ch= &(buf[2]);
644
645         /* We have a cert associated with the SSL, so attach it to
646          * the session if it does not have one */
647
648         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
649                 {
650                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
651                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
652                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
653                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
654
655                 /* type=buf[0]; */
656                 /* type eq x509 */
657                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
658                         {
659                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
660                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
661                         return(-1);
662                         }
663                 cert_ch_len=i-1;
664
665                 if ((s->cert == NULL) ||
666                         (s->cert->key->x509 == NULL) ||
667                         (s->cert->key->privatekey == NULL))
668                         {
669                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
670                         }
671                 else
672                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
673                 }
674
675         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
676                 {
677                 X509 *x509=NULL;
678                 EVP_PKEY *pkey=NULL;
679
680                 /* If we get an error we need to
681                  * ssl->rwstate=SSL_X509_LOOKUP;
682                  * return(error);
683                  * We should then be retried when things are ok and we
684                  * can get a cert or not */
685
686                 i=0;
687                 if (s->ctx->client_cert_cb != NULL)
688                         {
689                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
690                         }
691
692                 if (i < 0)
693                         {
694                         s->rwstate=SSL_X509_LOOKUP;
695                         return(-1);
696                         }
697                 s->rwstate=SSL_NOTHING;
698
699                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
700                         {
701                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
702                         if (    !SSL_use_certificate(s,x509) || 
703                                 !SSL_use_PrivateKey(s,pkey))
704                                 {
705                                 i=0;
706                                 }
707                         X509_free(x509);
708                         EVP_PKEY_free(pkey);
709                         }
710                 else if (i == 1)
711                         {
712                         if (x509 != NULL) X509_free(x509);
713                         if (pkey != NULL) EVP_PKEY_free(pkey);
714                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
715                         i=0;
716                         }
717
718                 if (i == 0)
719                         {
720                         /* We have no client certificate to respond with
721                          * so send the correct error message back */
722                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
723                         p=buf;
724                         *(p++)=SSL2_MT_ERROR;
725                         s2n(SSL2_PE_NO_CERTIFICATE,p);
726                         s->init_off=0;
727                         s->init_num=3;
728                         /* Write is done at the end */
729                         }
730                 }
731
732         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
733                 {
734                 return(ssl2_do_write(s));
735                 }
736
737         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
738                 {
739                 EVP_MD_CTX ctx;
740
741                 /* ok, now we calculate the checksum
742                  * do it first so we can reuse buf :-) */
743                 p=buf;
744                 EVP_SignInit(&ctx,s->ctx->rsa_md5);
745                 EVP_SignUpdate(&ctx,s->s2->key_material,
746                         (unsigned int)s->s2->key_material_length);
747                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
748                 n=i2d_X509(s->session->cert->key->x509,&p);
749                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
750
751                 p=buf;
752                 d=p+6;
753                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
754                 *(p++)=SSL2_CT_X509_CERTIFICATE;
755                 n=i2d_X509(s->cert->key->x509,&d);
756                 s2n(n,p);
757
758                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
759                         {
760                         /* this is not good.  If things have failed it
761                          * means there so something wrong with the key.
762                          * We will contiune with a 0 length signature
763                          */
764                         }
765                 memset(&ctx,0,sizeof(ctx));
766                 s2n(n,p);
767                 d+=n;
768
769                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
770                 s->init_num=d-buf;
771                 s->init_off=0;
772                 }
773         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
774         return(ssl2_do_write(s));
775         }
776
777 static int get_server_verify(s)
778 SSL *s;
779         {
780         unsigned char *p;
781         int i;
782
783         p=(unsigned char *)s->init_buf->data;
784         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
785                 {
786                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
787                 if (i < (1-s->init_num)) 
788                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
789
790                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
791                 s->init_num=0;
792                 if (*p != SSL2_MT_SERVER_VERIFY)
793                         {
794                         if (p[0] != SSL2_MT_ERROR)
795                                 {
796                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
797                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
798                                         SSL_R_READ_WRONG_PACKET_TYPE);
799                                 }
800                         else
801                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
802                                         SSL_R_PEER_ERROR);
803                         return(-1);
804                         }
805                 }
806         
807         p=(unsigned char *)s->init_buf->data;
808         i=ssl2_read(s,(char *)&(p[s->init_num]),
809                 (unsigned int)s->s2->challenge_length-s->init_num);
810         if (i < ((int)s->s2->challenge_length-s->init_num))
811                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
812         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
813                 {
814                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
815                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
816                 return(-1);
817                 }
818         return(1);
819         }
820
821 static int get_server_finished(s)
822 SSL *s;
823         {
824         unsigned char *buf;
825         unsigned char *p;
826         int i;
827
828         buf=(unsigned char *)s->init_buf->data;
829         p=buf;
830         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
831                 {
832                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
833                 if (i < (1-s->init_num))
834                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
835                 s->init_num=i;
836                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
837                         {
838                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
839                         return(1);
840                         }
841                 else if (*p != SSL2_MT_SERVER_FINISHED)
842                         {
843                         if (p[0] != SSL2_MT_ERROR)
844                                 {
845                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
846                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
847                                 }
848                         else
849                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
850                         return(-1);
851                         }
852                 s->state=SSL_ST_OK;
853                 s->init_num=0;
854                 }
855
856         i=ssl2_read(s,(char *)&(buf[s->init_num]),
857                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
858         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
859                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
860
861         if (!s->hit) /* new session */
862                 {
863                 /* new session-id */
864                 /* Make sure we were not trying to re-use an old SSL_SESSION
865                  * or bad things can happen */
866                 /* ZZZZZZZZZZZZZ */
867                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
868                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
869                 }
870         else
871                 {
872                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
873                         {
874                         if (memcmp(buf,s->session->session_id,
875                                 (unsigned int)s->session->session_id_length) != 0)
876                                 {
877                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
878                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
879                                 return(-1);
880                                 }
881                         }
882                 }
883         return(1);
884         }
885
886 /* loads in the certificate from the server */
887 int ssl2_set_certificate(s, type, len, data)
888 SSL *s;
889 int type;
890 int len;
891 unsigned char *data;
892         {
893         STACK *sk=NULL;
894         EVP_PKEY *pkey=NULL;
895         CERT *c=NULL;
896         int i;
897         X509 *x509=NULL;
898         int ret=0;
899         
900         x509=d2i_X509(NULL,&data,(long)len);
901         if (x509 == NULL)
902                 {
903                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
904                 goto err;
905                 }
906
907         if (((sk=sk_new_null()) == NULL) ||
908                 (!sk_push(sk,(char *)x509)))
909                 {
910                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
911                 goto err;
912                 }
913
914         i=ssl_verify_cert_chain(s,sk);
915                 
916         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
917                 {
918                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
919                 goto err;
920                 }
921
922         /* cert for ssl */
923         c=ssl_cert_new();
924         if (c == NULL)
925                 {
926                 ret= -1;
927                 goto err;
928                 }
929
930         /* cert for session */
931         if (s->session->cert) ssl_cert_free(s->session->cert);
932         s->session->cert=c;
933
934 /*      c->cert_type=type; */
935
936         c->pkeys[SSL_PKEY_RSA_ENC].x509=x509;
937         c->key= &(c->pkeys[SSL_PKEY_RSA_ENC]);
938
939         pkey=X509_get_pubkey(x509);
940         x509=NULL;
941         if (pkey == NULL)
942                 {
943                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
944                 goto err;
945                 }
946         if (pkey->type != EVP_PKEY_RSA)
947                 {
948                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
949                 goto err;
950                 }
951
952         if (!ssl_set_cert_type(c,SSL2_CT_X509_CERTIFICATE))
953                 goto err;
954         ret=1;
955 err:
956         if (sk != NULL) sk_free(sk);
957         if (x509 != NULL) X509_free(x509);
958         return(ret);
959         }
960
961 static int ssl_rsa_public_encrypt(c, len, from, to, padding)
962 CERT *c;
963 int len;
964 unsigned char *from;
965 unsigned char *to;
966 int padding;
967         {
968         EVP_PKEY *pkey=NULL;
969         int i= -1;
970
971         if ((c == NULL) || (c->key->x509 == NULL) ||
972                 ((pkey=X509_get_pubkey(c->key->x509)) == NULL))
973                 {
974                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
975                 return(-1);
976                 }
977         if (pkey->type != EVP_PKEY_RSA)
978                 {
979                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
980                 goto end;
981                 }
982
983         /* we have the public key */
984         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
985         if (i < 0)
986                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
987 end:
988         return(i);
989         }
990