2170e292899912b9fdeaeed0e8a662e37341cf44
[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 int get_server_finished(SSL *s);
68 static int get_server_verify(SSL *s);
69 static int get_server_hello(SSL *s);
70 static int client_hello(SSL *s); 
71 static int client_master_key(SSL *s);
72 static int client_finished(SSL *s);
73 static int client_certificate(SSL *s);
74 static int ssl_rsa_public_encrypt(CERT *c, int len, unsigned char *from,
75         unsigned char *to,int padding);
76 #else
77 static int get_server_finished();
78 static int get_server_verify();
79 static int get_server_hello();
80 static int client_hello(); 
81 static int client_master_key();
82 static int client_finished();
83 static int client_certificate();
84 static int ssl_rsa_public_encrypt();
85 #endif
86
87 #define BREAK   break
88
89 static SSL_METHOD *ssl2_get_client_method(ver)
90 int ver;
91         {
92         if (ver == SSL2_VERSION)
93                 return(SSLv2_client_method());
94         else
95                 return(NULL);
96         }
97
98 SSL_METHOD *SSLv2_client_method()
99         {
100         static int init=1;
101         static SSL_METHOD SSLv2_client_data;
102
103         if (init)
104                 {
105                 init=0;
106                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
107                         sizeof(SSL_METHOD));
108                 SSLv2_client_data.ssl_connect=ssl2_connect;
109                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
110                 }
111         return(&SSLv2_client_data);
112         }
113
114 int ssl2_connect(s)
115 SSL *s;
116         {
117         unsigned long l=time(NULL);
118         BUF_MEM *buf=NULL;
119         int ret= -1;
120         void (*cb)()=NULL;
121         int new_state,state;
122
123         RAND_seed((unsigned char *)&l,sizeof(l));
124         ERR_clear_error();
125         clear_sys_error();
126
127         if (s->info_callback != NULL)
128                 cb=s->info_callback;
129         else if (s->ctx->info_callback != NULL)
130                 cb=s->ctx->info_callback;
131
132         /* init things to blank */
133         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
134         s->in_handshake++;
135
136         for (;;)
137                 {
138                 state=s->state;
139
140                 switch (s->state)
141                         {
142                 case SSL_ST_BEFORE:
143                 case SSL_ST_CONNECT:
144                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
145                 case SSL_ST_OK|SSL_ST_CONNECT:
146
147                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
148
149                         s->version=SSL2_VERSION;
150                         s->type=SSL_ST_CONNECT;
151
152                         buf=s->init_buf;
153                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
154                                 {
155                                 ret= -1;
156                                 goto end;
157                                 }
158                         if (!BUF_MEM_grow(buf,
159                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
160                                 {
161                                 ret= -1;
162                                 goto end;
163                                 }
164                         s->init_buf=buf;
165                         s->init_num=0;
166                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
167                         s->ctx->sess_connect++;
168                         s->handshake_func=ssl2_connect;
169                         BREAK;
170
171                 case SSL2_ST_SEND_CLIENT_HELLO_A:
172                 case SSL2_ST_SEND_CLIENT_HELLO_B:
173                         s->shutdown=0;
174                         ret=client_hello(s);
175                         if (ret <= 0) goto end;
176                         s->init_num=0;
177                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
178                         BREAK;
179                 
180                 case SSL2_ST_GET_SERVER_HELLO_A:
181                 case SSL2_ST_GET_SERVER_HELLO_B:
182                         ret=get_server_hello(s);
183                         if (ret <= 0) goto end;
184                         s->init_num=0;
185                         if (!s->hit) /* new session */
186                                 {
187                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
188                                 BREAK; 
189                                 }
190                         else
191                                 {
192                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
193                                 break;
194                                 }
195         
196                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
197                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
198                         ret=client_master_key(s);
199                         if (ret <= 0) goto end;
200                         s->init_num=0;
201                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
202                         break;
203
204                 case SSL2_ST_CLIENT_START_ENCRYPTION:
205                         /* Ok, we now have all the stuff needed to
206                          * start encrypting, so lets fire it up :-) */
207                         if (!ssl2_enc_init(s,1))
208                                 {
209                                 ret= -1;
210                                 goto end;
211                                 }
212                         s->s2->clear_text=0;
213                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
214                         break;
215
216                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
217                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
218                         ret=client_finished(s);
219                         if (ret <= 0) goto end;
220                         s->init_num=0;
221                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
222                         break;
223
224                 case SSL2_ST_GET_SERVER_VERIFY_A:
225                 case SSL2_ST_GET_SERVER_VERIFY_B:
226                         ret=get_server_verify(s);
227                         if (ret <= 0) goto end;
228                         s->init_num=0;
229                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
230                         break;
231
232                 case SSL2_ST_GET_SERVER_FINISHED_A:
233                 case SSL2_ST_GET_SERVER_FINISHED_B:
234                         ret=get_server_finished(s);
235                         if (ret <= 0) goto end;
236                         break;
237
238                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
239                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
240                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
241                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
242                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
243                         ret=client_certificate(s);
244                         if (ret <= 0) goto end;
245                         s->init_num=0;
246                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
247                         break;
248
249                 case SSL_ST_OK:
250                         BUF_MEM_free(s->init_buf);
251                         s->init_buf=NULL;
252                         s->init_num=0;
253                 /*      ERR_clear_error();*/
254
255                         /* If we want to cache session-ids in the client
256                          * and we sucessfully add the session-id to the
257                          * cache, and there is a callback, then pass it out.
258                          * 26/11/96 - eay - only add if not a re-used session.
259                          */
260
261                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
262                         if (s->hit) s->ctx->sess_hit++;
263
264                         ret=1;
265                         /* s->server=0; */
266                         s->ctx->sess_connect_good++;
267
268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
269
270                         goto end;
271                         /* break; */
272                 default:
273                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
274                         return(-1);
275                         /* break; */
276                         }
277
278                 if ((cb != NULL) && (s->state != state))
279                         {
280                         new_state=s->state;
281                         s->state=state;
282                         cb(s,SSL_CB_CONNECT_LOOP,1);
283                         s->state=new_state;
284                         }
285                 }
286 end:
287         s->in_handshake--;
288         if (cb != NULL) 
289                 cb(s,SSL_CB_CONNECT_EXIT,ret);
290         return(ret);
291         }
292
293 static int get_server_hello(s)
294 SSL *s;
295         {
296         unsigned char *buf;
297         unsigned char *p;
298         int i,j;
299         STACK *sk=NULL,*cl;
300
301         buf=(unsigned char *)s->init_buf->data;
302         p=buf;
303         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
304                 {
305                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
306                 if (i < (11-s->init_num)) 
307                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
308
309                 if (*(p++) != SSL2_MT_SERVER_HELLO)
310                         {
311                         if (p[-1] != SSL2_MT_ERROR)
312                                 {
313                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
314                                 SSLerr(SSL_F_GET_SERVER_HELLO,
315                                         SSL_R_READ_WRONG_PACKET_TYPE);
316                                 }
317                         else
318                                 SSLerr(SSL_F_GET_SERVER_HELLO,
319                                         SSL_R_PEER_ERROR);
320                         return(-1);
321                         }
322                 s->hit=(*(p++))?1:0;
323                 s->s2->tmp.cert_type= *(p++);
324                 n2s(p,i);
325                 if (i < s->version) s->version=i;
326                 n2s(p,i); s->s2->tmp.cert_length=i;
327                 n2s(p,i); s->s2->tmp.csl=i;
328                 n2s(p,i); s->s2->tmp.conn_id_length=i;
329                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
330                 s->init_num=0;
331                 }
332
333         /* SSL2_ST_GET_SERVER_HELLO_B */
334         j=s->s2->tmp.cert_length+s->s2->tmp.csl+s->s2->tmp.conn_id_length
335                 - s->init_num;
336         i=ssl2_read(s,(char *)&(buf[s->init_num]),j);
337         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
338
339         /* things are looking good */
340
341         p=buf;
342         if (s->hit)
343                 {
344                 if (s->s2->tmp.cert_length != 0) 
345                         {
346                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
347                         return(-1);
348                         }
349                 if (s->s2->tmp.cert_type != 0)
350                         {
351                         if (!(s->options &
352                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
353                                 {
354                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
355                                 return(-1);
356                                 }
357                         }
358                 if (s->s2->tmp.csl != 0)
359                         {
360                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
361                         return(-1);
362                         }
363                 }
364         else
365                 {
366 #ifdef undef
367                 /* very bad */
368                 memset(s->session->session_id,0,
369                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
370                 s->session->session_id_length=0;
371                 */
372 #endif
373
374                 /* we need to do this incase we were trying to reuse a 
375                  * client session but others are already reusing it.
376                  * If this was a new 'blank' session ID, the session-id
377                  * length will still be 0 */
378                 if (s->session->session_id_length > 0)
379                         {
380                         if (!ssl_get_new_session(s,0))
381                                 {
382                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
383                                 return(-1);
384                                 }
385                         }
386
387                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
388                         s->s2->tmp.cert_length,p) <= 0)
389                         {
390                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
391                         return(-1);
392                         }
393                 p+=s->s2->tmp.cert_length;
394
395                 if (s->s2->tmp.csl == 0)
396                         {
397                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
398                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
399                         return(-1);
400                         }
401
402                 /* We have just received a list of ciphers back from the
403                  * server.  We need to get the ones that match, then select
404                  * the one we want the most :-). */
405
406                 /* load the ciphers */
407                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
408                         &s->session->ciphers);
409                 p+=s->s2->tmp.csl;
410                 if (sk == NULL)
411                         {
412                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
413                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
414                         return(-1);
415                         }
416
417                 sk_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
418
419                 /* get the array of ciphers we will accept */
420                 cl=ssl_get_ciphers_by_id(s);
421
422                 /* In theory we could have ciphers sent back that we
423                  * don't want to use but that does not matter since we
424                  * will check against the list we origionally sent and
425                  * for performance reasons we should not bother to match
426                  * the two lists up just to check. */
427                 for (i=0; i<sk_num(cl); i++)
428                         {
429                         if (sk_find(sk,sk_value(cl,i)) >= 0)
430                                 break;
431                         }
432
433                 if (i >= sk_num(cl))
434                         {
435                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
436                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
437                         return(-1);
438                         }
439                 s->session->cipher=(SSL_CIPHER *)sk_value(cl,i);
440                 }
441
442         if ((s->session != NULL) && (s->session->peer != NULL))
443                 X509_free(s->session->peer);
444
445         /* hmmm, can we have the problem of the other session with this
446          * cert, Free's it before we increment the reference count. */
447         CRYPTO_w_lock(CRYPTO_LOCK_X509);
448         s->session->peer=s->session->cert->key->x509;
449         CRYPTO_add(&s->session->peer->references,1,CRYPTO_LOCK_X509);
450         CRYPTO_w_unlock(CRYPTO_LOCK_X509);
451
452         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
453         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
454         return(1);
455         }
456
457 static int client_hello(s)
458 SSL *s;
459         {
460         unsigned char *buf;
461         unsigned char *p,*d;
462 /*      CIPHER **cipher;*/
463         int i,n,j;
464
465         buf=(unsigned char *)s->init_buf->data;
466         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
467                 {
468                 if ((s->session == NULL) ||
469                         (s->session->ssl_version != s->version))
470                         {
471                         if (!ssl_get_new_session(s,0))
472                                 {
473                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
474                                 return(-1);
475                                 }
476                         }
477                 /* else use the pre-loaded session */
478
479                 p=buf;                                  /* header */
480                 d=p+9;                                  /* data section */
481                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
482                 s2n(SSL2_CLIENT_VERSION,p);             /* version */
483                 n=j=0;
484
485                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
486                 d+=n;
487
488                 if (n == 0)
489                         {
490                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
491                         return(-1);
492                         }
493
494                 s2n(n,p);                       /* cipher spec num bytes */
495
496                 if ((s->session->session_id_length > 0) &&
497                         (s->session->session_id_length <=
498                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
499                         {
500                         i=s->session->session_id_length;
501                         s2n(i,p);               /* session id length */
502                         memcpy(d,s->session->session_id,(unsigned int)i);
503                         d+=i;
504                         }
505                 else
506                         {
507                         s2n(0,p);
508                         }
509
510                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
511                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
512                 /*challenge id data*/
513                 RAND_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
514                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
515                 d+=SSL2_CHALLENGE_LENGTH;
516
517                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
518                 s->init_num=d-buf;
519                 s->init_off=0;
520                 }
521         /* SSL2_ST_SEND_CLIENT_HELLO_B */
522         return(ssl2_do_write(s));
523         }
524
525 static int client_master_key(s)
526 SSL *s;
527         {
528         unsigned char *buf;
529         unsigned char *p,*d;
530         int clear,enc,karg,i;
531         SSL_SESSION *sess;
532         EVP_CIPHER *c;
533         EVP_MD *md;
534
535         buf=(unsigned char *)s->init_buf->data;
536         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
537                 {
538
539                 if (!ssl_cipher_get_evp(s->session->cipher,&c,&md))
540                         {
541                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
542                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
543                         return(-1);
544                         }
545                 sess=s->session;
546                 p=buf;
547                 d=p+10;
548                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
549
550                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
551                 p+=i;
552
553                 /* make key_arg data */
554                 i=EVP_CIPHER_iv_length(c);
555                 sess->key_arg_length=i;
556                 if (i > 0) RAND_bytes(sess->key_arg,i);
557
558                 /* make a master key */
559                 i=EVP_CIPHER_key_length(c);
560                 sess->master_key_length=i;
561                 if (i > 0) RAND_bytes(sess->master_key,i);
562
563                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
564                         enc=8;
565                 else if (sess->cipher->algorithms & SSL_EXP)
566                         enc=5;
567                 else
568                         enc=i;
569
570                 if (i < enc)
571                         {
572                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
573                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
574                         return(-1);
575                         }
576                 clear=i-enc;
577                 s2n(clear,p);
578                 memcpy(d,sess->master_key,(unsigned int)clear);
579                 d+=clear;
580
581                 enc=ssl_rsa_public_encrypt(sess->cert,enc,
582                         &(sess->master_key[clear]),d,
583                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
584                 if (enc <= 0)
585                         {
586                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
587                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
588                         return(-1);
589                         }
590 #ifdef PKCS1_CHECK
591                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
592                 if (s->options & SSL_OP_PKCS1_CHECK_2)
593                         sess->master_key[clear]++;
594 #endif
595                 s2n(enc,p);
596                 d+=enc;
597                 karg=sess->key_arg_length;      
598                 s2n(karg,p); /* key arg size */
599                 memcpy(d,sess->key_arg,(unsigned int)karg);
600                 d+=karg;
601
602                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
603                 s->init_num=d-buf;
604                 s->init_off=0;
605                 }
606
607         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
608         return(ssl2_do_write(s));
609         }
610
611 static int client_finished(s)
612 SSL *s;
613         {
614         unsigned char *p;
615
616         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
617                 {
618                 p=(unsigned char *)s->init_buf->data;
619                 *(p++)=SSL2_MT_CLIENT_FINISHED;
620                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
621
622                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
623                 s->init_num=s->s2->conn_id_length+1;
624                 s->init_off=0;
625                 }
626         return(ssl2_do_write(s));
627         }
628
629 /* read the data and then respond */
630 static int client_certificate(s)
631 SSL *s;
632         {
633         unsigned char *buf;
634         unsigned char *p,*d;
635         int i;
636         unsigned int n;
637         int cert_ch_len=0;
638         unsigned char *cert_ch;
639
640         buf=(unsigned char *)s->init_buf->data;
641         cert_ch= &(buf[2]);
642
643         /* We have a cert associated with the SSL, so attach it to
644          * the session if it does not have one */
645
646         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
647                 {
648                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
649                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
650                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
651                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
652
653                 /* type=buf[0]; */
654                 /* type eq x509 */
655                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
656                         {
657                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
658                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
659                         return(-1);
660                         }
661                 cert_ch_len=i-1;
662
663                 if ((s->cert == NULL) ||
664                         (s->cert->key->x509 == NULL) ||
665                         (s->cert->key->privatekey == NULL))
666                         {
667                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
668                         }
669                 else
670                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
671                 }
672
673         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
674                 {
675                 X509 *x509=NULL;
676                 EVP_PKEY *pkey=NULL;
677
678                 /* If we get an error we need to
679                  * ssl->rwstate=SSL_X509_LOOKUP;
680                  * return(error);
681                  * We should then be retried when things are ok and we
682                  * can get a cert or not */
683
684                 i=0;
685                 if (s->ctx->client_cert_cb != NULL)
686                         {
687                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
688                         }
689
690                 if (i < 0)
691                         {
692                         s->rwstate=SSL_X509_LOOKUP;
693                         return(-1);
694                         }
695                 s->rwstate=SSL_NOTHING;
696
697                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
698                         {
699                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
700                         if (    !SSL_use_certificate(s,x509) || 
701                                 !SSL_use_PrivateKey(s,pkey))
702                                 {
703                                 i=0;
704                                 }
705                         X509_free(x509);
706                         EVP_PKEY_free(pkey);
707                         }
708                 else if (i == 1)
709                         {
710                         if (x509 != NULL) X509_free(x509);
711                         if (pkey != NULL) EVP_PKEY_free(pkey);
712                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
713                         i=0;
714                         }
715
716                 if (i == 0)
717                         {
718                         /* We have no client certificate to respond with
719                          * so send the correct error message back */
720                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
721                         p=buf;
722                         *(p++)=SSL2_MT_ERROR;
723                         s2n(SSL2_PE_NO_CERTIFICATE,p);
724                         s->init_off=0;
725                         s->init_num=3;
726                         /* Write is done at the end */
727                         }
728                 }
729
730         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
731                 {
732                 return(ssl2_do_write(s));
733                 }
734
735         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
736                 {
737                 EVP_MD_CTX ctx;
738
739                 /* ok, now we calculate the checksum
740                  * do it first so we can reuse buf :-) */
741                 p=buf;
742                 EVP_SignInit(&ctx,s->ctx->rsa_md5);
743                 EVP_SignUpdate(&ctx,s->s2->key_material,
744                         (unsigned int)s->s2->key_material_length);
745                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
746                 n=i2d_X509(s->session->cert->key->x509,&p);
747                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
748
749                 p=buf;
750                 d=p+6;
751                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
752                 *(p++)=SSL2_CT_X509_CERTIFICATE;
753                 n=i2d_X509(s->cert->key->x509,&d);
754                 s2n(n,p);
755
756                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
757                         {
758                         /* this is not good.  If things have failed it
759                          * means there so something wrong with the key.
760                          * We will contiune with a 0 length signature
761                          */
762                         }
763                 memset(&ctx,0,sizeof(ctx));
764                 s2n(n,p);
765                 d+=n;
766
767                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
768                 s->init_num=d-buf;
769                 s->init_off=0;
770                 }
771         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
772         return(ssl2_do_write(s));
773         }
774
775 static int get_server_verify(s)
776 SSL *s;
777         {
778         unsigned char *p;
779         int i;
780
781         p=(unsigned char *)s->init_buf->data;
782         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
783                 {
784                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
785                 if (i < (1-s->init_num)) 
786                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
787
788                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
789                 s->init_num=0;
790                 if (*p != SSL2_MT_SERVER_VERIFY)
791                         {
792                         if (p[0] != SSL2_MT_ERROR)
793                                 {
794                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
795                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
796                                         SSL_R_READ_WRONG_PACKET_TYPE);
797                                 }
798                         else
799                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
800                                         SSL_R_PEER_ERROR);
801                         return(-1);
802                         }
803                 }
804         
805         p=(unsigned char *)s->init_buf->data;
806         i=ssl2_read(s,(char *)&(p[s->init_num]),
807                 (unsigned int)s->s2->challenge_length-s->init_num);
808         if (i < ((int)s->s2->challenge_length-s->init_num))
809                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
810         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
811                 {
812                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
813                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
814                 return(-1);
815                 }
816         return(1);
817         }
818
819 static int get_server_finished(s)
820 SSL *s;
821         {
822         unsigned char *buf;
823         unsigned char *p;
824         int i;
825
826         buf=(unsigned char *)s->init_buf->data;
827         p=buf;
828         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
829                 {
830                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
831                 if (i < (1-s->init_num))
832                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
833                 s->init_num=i;
834                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
835                         {
836                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
837                         return(1);
838                         }
839                 else if (*p != SSL2_MT_SERVER_FINISHED)
840                         {
841                         if (p[0] != SSL2_MT_ERROR)
842                                 {
843                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
844                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
845                                 }
846                         else
847                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
848                         return(-1);
849                         }
850                 s->state=SSL_ST_OK;
851                 s->init_num=0;
852                 }
853
854         i=ssl2_read(s,(char *)&(buf[s->init_num]),
855                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
856         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
857                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
858
859         if (!s->hit) /* new session */
860                 {
861                 /* new session-id */
862                 /* Make sure we were not trying to re-use an old SSL_SESSION
863                  * or bad things can happen */
864                 /* ZZZZZZZZZZZZZ */
865                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
866                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
867                 }
868         else
869                 {
870                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
871                         {
872                         if (memcmp(buf,s->session->session_id,
873                                 (unsigned int)s->session->session_id_length) != 0)
874                                 {
875                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
876                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
877                                 return(-1);
878                                 }
879                         }
880                 }
881         return(1);
882         }
883
884 /* loads in the certificate from the server */
885 int ssl2_set_certificate(s, type, len, data)
886 SSL *s;
887 int type;
888 int len;
889 unsigned char *data;
890         {
891         STACK *sk=NULL;
892         EVP_PKEY *pkey=NULL;
893         CERT *c=NULL;
894         int i;
895         X509 *x509=NULL;
896         int ret=0;
897         
898         x509=d2i_X509(NULL,&data,(long)len);
899         if (x509 == NULL)
900                 {
901                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
902                 goto err;
903                 }
904
905         if (((sk=sk_new_null()) == NULL) ||
906                 (!sk_push(sk,(char *)x509)))
907                 {
908                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
909                 goto err;
910                 }
911
912         i=ssl_verify_cert_chain(s,sk);
913                 
914         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
915                 {
916                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
917                 goto err;
918                 }
919
920         /* cert for ssl */
921         c=ssl_cert_new();
922         if (c == NULL)
923                 {
924                 ret= -1;
925                 goto err;
926                 }
927
928         /* cert for session */
929         if (s->session->cert) ssl_cert_free(s->session->cert);
930         s->session->cert=c;
931
932 /*      c->cert_type=type; */
933
934         c->pkeys[SSL_PKEY_RSA_ENC].x509=x509;
935         c->key= &(c->pkeys[SSL_PKEY_RSA_ENC]);
936
937         pkey=X509_get_pubkey(x509);
938         x509=NULL;
939         if (pkey == NULL)
940                 {
941                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
942                 goto err;
943                 }
944         if (pkey->type != EVP_PKEY_RSA)
945                 {
946                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
947                 goto err;
948                 }
949
950         if (!ssl_set_cert_type(c,SSL2_CT_X509_CERTIFICATE))
951                 goto err;
952         ret=1;
953 err:
954         if (sk != NULL) sk_free(sk);
955         if (x509 != NULL) X509_free(x509);
956         return(ret);
957         }
958
959 static int ssl_rsa_public_encrypt(c, len, from, to, padding)
960 CERT *c;
961 int len;
962 unsigned char *from;
963 unsigned char *to;
964 int padding;
965         {
966         EVP_PKEY *pkey=NULL;
967         int i= -1;
968
969         if ((c == NULL) || (c->key->x509 == NULL) ||
970                 ((pkey=X509_get_pubkey(c->key->x509)) == NULL))
971                 {
972                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
973                 return(-1);
974                 }
975         if (pkey->type != EVP_PKEY_RSA)
976                 {
977                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
978                 goto end;
979                 }
980
981         /* we have the public key */
982         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
983         if (i < 0)
984                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
985 end:
986         return(i);
987         }
988