Fix code structure (if ... else if ... where both parts
[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 "ssl_locl.h"
60 #ifndef NO_SSL2
61 #include <stdio.h>
62 #include <openssl/rand.h>
63 #include <openssl/buffer.h>
64 #include <openssl/objects.h>
65 #include <openssl/evp.h>
66
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(SESS_CERT *sc, int len, unsigned char *from,
76         unsigned char *to,int padding);
77 #define BREAK   break
78
79 static SSL_METHOD *ssl2_get_client_method(int ver)
80         {
81         if (ver == SSL2_VERSION)
82                 return(SSLv2_client_method());
83         else
84                 return(NULL);
85         }
86
87 SSL_METHOD *SSLv2_client_method(void)
88         {
89         static int init=1;
90         static SSL_METHOD SSLv2_client_data;
91
92         if (init)
93                 {
94                 memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
95                         sizeof(SSL_METHOD));
96                 SSLv2_client_data.ssl_connect=ssl2_connect;
97                 SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
98                 init=0;
99                 }
100         return(&SSLv2_client_data);
101         }
102
103 int ssl2_connect(SSL *s)
104         {
105         unsigned long l=time(NULL);
106         BUF_MEM *buf=NULL;
107         int ret= -1;
108         void (*cb)()=NULL;
109         int new_state,state;
110
111         RAND_add(&l,sizeof(l),0);
112         ERR_clear_error();
113         clear_sys_error();
114
115         if (s->info_callback != NULL)
116                 cb=s->info_callback;
117         else if (s->ctx->info_callback != NULL)
118                 cb=s->ctx->info_callback;
119
120         /* init things to blank */
121         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
122         s->in_handshake++;
123
124         for (;;)
125                 {
126                 state=s->state;
127
128                 switch (s->state)
129                         {
130                 case SSL_ST_BEFORE:
131                 case SSL_ST_CONNECT:
132                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
133                 case SSL_ST_OK|SSL_ST_CONNECT:
134
135                         s->server=0;
136                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
137
138                         s->version=SSL2_VERSION;
139                         s->type=SSL_ST_CONNECT;
140
141                         buf=s->init_buf;
142                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
143                                 {
144                                 ret= -1;
145                                 goto end;
146                                 }
147                         if (!BUF_MEM_grow(buf,
148                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
149                                 {
150                                 ret= -1;
151                                 goto end;
152                                 }
153                         s->init_buf=buf;
154                         s->init_num=0;
155                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
156                         s->ctx->stats.sess_connect++;
157                         s->handshake_func=ssl2_connect;
158                         BREAK;
159
160                 case SSL2_ST_SEND_CLIENT_HELLO_A:
161                 case SSL2_ST_SEND_CLIENT_HELLO_B:
162                         s->shutdown=0;
163                         ret=client_hello(s);
164                         if (ret <= 0) goto end;
165                         s->init_num=0;
166                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
167                         BREAK;
168                 
169                 case SSL2_ST_GET_SERVER_HELLO_A:
170                 case SSL2_ST_GET_SERVER_HELLO_B:
171                         ret=get_server_hello(s);
172                         if (ret <= 0) goto end;
173                         s->init_num=0;
174                         if (!s->hit) /* new session */
175                                 {
176                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
177                                 BREAK; 
178                                 }
179                         else
180                                 {
181                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
182                                 break;
183                                 }
184         
185                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
186                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
187                         ret=client_master_key(s);
188                         if (ret <= 0) goto end;
189                         s->init_num=0;
190                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
191                         break;
192
193                 case SSL2_ST_CLIENT_START_ENCRYPTION:
194                         /* Ok, we now have all the stuff needed to
195                          * start encrypting, so lets fire it up :-) */
196                         if (!ssl2_enc_init(s,1))
197                                 {
198                                 ret= -1;
199                                 goto end;
200                                 }
201                         s->s2->clear_text=0;
202                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
203                         break;
204
205                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
206                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
207                         ret=client_finished(s);
208                         if (ret <= 0) goto end;
209                         s->init_num=0;
210                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
211                         break;
212
213                 case SSL2_ST_GET_SERVER_VERIFY_A:
214                 case SSL2_ST_GET_SERVER_VERIFY_B:
215                         ret=get_server_verify(s);
216                         if (ret <= 0) goto end;
217                         s->init_num=0;
218                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
219                         break;
220
221                 case SSL2_ST_GET_SERVER_FINISHED_A:
222                 case SSL2_ST_GET_SERVER_FINISHED_B:
223                         ret=get_server_finished(s);
224                         if (ret <= 0) goto end;
225                         break;
226
227                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
228                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
229                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
230                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
231                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
232                         ret=client_certificate(s);
233                         if (ret <= 0) goto end;
234                         s->init_num=0;
235                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
236                         break;
237
238                 case SSL_ST_OK:
239                         if (s->init_buf != NULL)
240                                 {
241                                 BUF_MEM_free(s->init_buf);
242                                 s->init_buf=NULL;
243                                 }
244                         s->init_num=0;
245                 /*      ERR_clear_error();*/
246
247                         /* If we want to cache session-ids in the client
248                          * and we successfully add the session-id to the
249                          * cache, and there is a callback, then pass it out.
250                          * 26/11/96 - eay - only add if not a re-used session.
251                          */
252
253                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
254                         if (s->hit) s->ctx->stats.sess_hit++;
255
256                         ret=1;
257                         /* s->server=0; */
258                         s->ctx->stats.sess_connect_good++;
259
260                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
261
262                         goto end;
263                         /* break; */
264                 default:
265                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
266                         return(-1);
267                         /* break; */
268                         }
269
270                 if ((cb != NULL) && (s->state != state))
271                         {
272                         new_state=s->state;
273                         s->state=state;
274                         cb(s,SSL_CB_CONNECT_LOOP,1);
275                         s->state=new_state;
276                         }
277                 }
278 end:
279         s->in_handshake--;
280         if (cb != NULL) 
281                 cb(s,SSL_CB_CONNECT_EXIT,ret);
282         return(ret);
283         }
284
285 static int get_server_hello(SSL *s)
286         {
287         unsigned char *buf;
288         unsigned char *p;
289         int i,j;
290         STACK_OF(SSL_CIPHER) *sk=NULL,*cl;
291
292         buf=(unsigned char *)s->init_buf->data;
293         p=buf;
294         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
295                 {
296                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
297                 if (i < (11-s->init_num)) 
298                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
299
300                 if (*(p++) != SSL2_MT_SERVER_HELLO)
301                         {
302                         if (p[-1] != SSL2_MT_ERROR)
303                                 {
304                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
305                                 SSLerr(SSL_F_GET_SERVER_HELLO,
306                                         SSL_R_READ_WRONG_PACKET_TYPE);
307                                 }
308                         else
309                                 SSLerr(SSL_F_GET_SERVER_HELLO,
310                                         SSL_R_PEER_ERROR);
311                         return(-1);
312                         }
313 #ifdef __APPLE_CC__
314                 /* The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug
315                  * workaround. <appro@fy.chalmers.se> */
316                 s->hit=(i=*(p++))?1:0;
317 #else
318                 s->hit=(*(p++))?1:0;
319 #endif
320                 s->s2->tmp.cert_type= *(p++);
321                 n2s(p,i);
322                 if (i < s->version) s->version=i;
323                 n2s(p,i); s->s2->tmp.cert_length=i;
324                 n2s(p,i); s->s2->tmp.csl=i;
325                 n2s(p,i); s->s2->tmp.conn_id_length=i;
326                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
327                 s->init_num=0;
328                 }
329
330         /* SSL2_ST_GET_SERVER_HELLO_B */
331         j=s->s2->tmp.cert_length+s->s2->tmp.csl+s->s2->tmp.conn_id_length
332                 - s->init_num;
333         i=ssl2_read(s,(char *)&(buf[s->init_num]),j);
334         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
335
336         /* things are looking good */
337
338         p=buf;
339         if (s->hit)
340                 {
341                 if (s->s2->tmp.cert_length != 0) 
342                         {
343                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
344                         return(-1);
345                         }
346                 if (s->s2->tmp.cert_type != 0)
347                         {
348                         if (!(s->options &
349                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
350                                 {
351                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
352                                 return(-1);
353                                 }
354                         }
355                 if (s->s2->tmp.csl != 0)
356                         {
357                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
358                         return(-1);
359                         }
360                 }
361         else
362                 {
363 #ifdef undef
364                 /* very bad */
365                 memset(s->session->session_id,0,
366                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
367                 s->session->session_id_length=0;
368                 */
369 #endif
370
371                 /* we need to do this in case we were trying to reuse a 
372                  * client session but others are already reusing it.
373                  * If this was a new 'blank' session ID, the session-id
374                  * length will still be 0 */
375                 if (s->session->session_id_length > 0)
376                         {
377                         if (!ssl_get_new_session(s,0))
378                                 {
379                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
380                                 return(-1);
381                                 }
382                         }
383
384                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
385                         s->s2->tmp.cert_length,p) <= 0)
386                         {
387                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
388                         return(-1);
389                         }
390                 p+=s->s2->tmp.cert_length;
391
392                 if (s->s2->tmp.csl == 0)
393                         {
394                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
395                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
396                         return(-1);
397                         }
398
399                 /* We have just received a list of ciphers back from the
400                  * server.  We need to get the ones that match, then select
401                  * the one we want the most :-). */
402
403                 /* load the ciphers */
404                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
405                                             &s->session->ciphers);
406                 p+=s->s2->tmp.csl;
407                 if (sk == NULL)
408                         {
409                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
410                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
411                         return(-1);
412                         }
413
414                 sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
415
416                 /* get the array of ciphers we will accept */
417                 cl=ssl_get_ciphers_by_id(s);
418
419                 /* In theory we could have ciphers sent back that we
420                  * don't want to use but that does not matter since we
421                  * will check against the list we originally sent and
422                  * for performance reasons we should not bother to match
423                  * the two lists up just to check. */
424                 for (i=0; i<sk_SSL_CIPHER_num(cl); i++)
425                         {
426                         if (sk_SSL_CIPHER_find(sk,
427                                                sk_SSL_CIPHER_value(cl,i)) >= 0)
428                                 break;
429                         }
430
431                 if (i >= sk_SSL_CIPHER_num(cl))
432                         {
433                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
434                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
435                         return(-1);
436                         }
437                 s->session->cipher=sk_SSL_CIPHER_value(cl,i);
438
439
440                 if (s->session->peer != NULL) /* can't happen*/
441                         {
442                         ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
443                         SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_INTERNAL_ERROR);
444                         return(-1);
445                         }
446
447                 s->session->peer = s->session->sess_cert->peer_key->x509;
448                 /* peer_key->x509 has been set by ssl2_set_certificate. */
449                 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
450                 }
451
452         if (s->session->peer != s->session->sess_cert->peer_key->x509)
453                 /* can't happen */
454                 {
455                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
456                 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_INTERNAL_ERROR);
457                 return(-1);
458                 }
459                 
460         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
461         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
462         return(1);
463         }
464
465 static int client_hello(SSL *s)
466         {
467         unsigned char *buf;
468         unsigned char *p,*d;
469 /*      CIPHER **cipher;*/
470         int i,n,j;
471
472         buf=(unsigned char *)s->init_buf->data;
473         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
474                 {
475                 if ((s->session == NULL) ||
476                         (s->session->ssl_version != s->version))
477                         {
478                         if (!ssl_get_new_session(s,0))
479                                 {
480                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
481                                 return(-1);
482                                 }
483                         }
484                 /* else use the pre-loaded session */
485
486                 p=buf;                                  /* header */
487                 d=p+9;                                  /* data section */
488                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
489                 s2n(SSL2_VERSION,p);                    /* version */
490                 n=j=0;
491
492                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d);
493                 d+=n;
494
495                 if (n == 0)
496                         {
497                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
498                         return(-1);
499                         }
500
501                 s2n(n,p);                       /* cipher spec num bytes */
502
503                 if ((s->session->session_id_length > 0) &&
504                         (s->session->session_id_length <=
505                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
506                         {
507                         i=s->session->session_id_length;
508                         s2n(i,p);               /* session id length */
509                         memcpy(d,s->session->session_id,(unsigned int)i);
510                         d+=i;
511                         }
512                 else
513                         {
514                         s2n(0,p);
515                         }
516
517                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
518                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
519                 /*challenge id data*/
520                 RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH);
521                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
522                 d+=SSL2_CHALLENGE_LENGTH;
523
524                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
525                 s->init_num=d-buf;
526                 s->init_off=0;
527                 }
528         /* SSL2_ST_SEND_CLIENT_HELLO_B */
529         return(ssl2_do_write(s));
530         }
531
532 static int client_master_key(SSL *s)
533         {
534         unsigned char *buf;
535         unsigned char *p,*d;
536         int clear,enc,karg,i;
537         SSL_SESSION *sess;
538         const EVP_CIPHER *c;
539         const EVP_MD *md;
540
541         buf=(unsigned char *)s->init_buf->data;
542         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
543                 {
544
545                 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
546                         {
547                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
548                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
549                         return(-1);
550                         }
551                 sess=s->session;
552                 p=buf;
553                 d=p+10;
554                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
555
556                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
557                 p+=i;
558
559                 /* make key_arg data */
560                 i=EVP_CIPHER_iv_length(c);
561                 sess->key_arg_length=i;
562                 if (i > 0) RAND_pseudo_bytes(sess->key_arg,i);
563
564                 /* make a master key */
565                 i=EVP_CIPHER_key_length(c);
566                 sess->master_key_length=i;
567                 if (i > 0)
568                         {
569                         if (RAND_bytes(sess->master_key,i) <= 0)
570                                 {
571                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
572                                 return(-1);
573                                 }
574                         }
575
576                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
577                         enc=8;
578                 else if (SSL_C_IS_EXPORT(sess->cipher))
579                         enc=5;
580                 else
581                         enc=i;
582
583                 if (i < enc)
584                         {
585                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
586                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
587                         return(-1);
588                         }
589                 clear=i-enc;
590                 s2n(clear,p);
591                 memcpy(d,sess->master_key,(unsigned int)clear);
592                 d+=clear;
593
594                 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
595                         &(sess->master_key[clear]),d,
596                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
597                 if (enc <= 0)
598                         {
599                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
600                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
601                         return(-1);
602                         }
603 #ifdef PKCS1_CHECK
604                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
605                 if (s->options & SSL_OP_PKCS1_CHECK_2)
606                         sess->master_key[clear]++;
607 #endif
608                 s2n(enc,p);
609                 d+=enc;
610                 karg=sess->key_arg_length;      
611                 s2n(karg,p); /* key arg size */
612                 memcpy(d,sess->key_arg,(unsigned int)karg);
613                 d+=karg;
614
615                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
616                 s->init_num=d-buf;
617                 s->init_off=0;
618                 }
619
620         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
621         return(ssl2_do_write(s));
622         }
623
624 static int client_finished(SSL *s)
625         {
626         unsigned char *p;
627
628         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
629                 {
630                 p=(unsigned char *)s->init_buf->data;
631                 *(p++)=SSL2_MT_CLIENT_FINISHED;
632                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
633
634                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
635                 s->init_num=s->s2->conn_id_length+1;
636                 s->init_off=0;
637                 }
638         return(ssl2_do_write(s));
639         }
640
641 /* read the data and then respond */
642 static int client_certificate(SSL *s)
643         {
644         unsigned char *buf;
645         unsigned char *p,*d;
646         int i;
647         unsigned int n;
648         int cert_ch_len=0;
649         unsigned char *cert_ch;
650
651         buf=(unsigned char *)s->init_buf->data;
652         cert_ch= &(buf[2]);
653
654         /* We have a cert associated with the SSL, so attach it to
655          * the session if it does not have one */
656
657         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
658                 {
659                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
660                         SSL2_MAX_CERT_CHALLENGE_LENGTH+1-s->init_num);
661                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+1-s->init_num))
662                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
663
664                 /* type=buf[0]; */
665                 /* type eq x509 */
666                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
667                         {
668                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
669                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
670                         return(-1);
671                         }
672                 cert_ch_len=i-1;
673
674                 if ((s->cert == NULL) ||
675                         (s->cert->key->x509 == NULL) ||
676                         (s->cert->key->privatekey == NULL))
677                         {
678                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
679                         }
680                 else
681                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
682                 }
683
684         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
685                 {
686                 X509 *x509=NULL;
687                 EVP_PKEY *pkey=NULL;
688
689                 /* If we get an error we need to
690                  * ssl->rwstate=SSL_X509_LOOKUP;
691                  * return(error);
692                  * We should then be retried when things are ok and we
693                  * can get a cert or not */
694
695                 i=0;
696                 if (s->ctx->client_cert_cb != NULL)
697                         {
698                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
699                         }
700
701                 if (i < 0)
702                         {
703                         s->rwstate=SSL_X509_LOOKUP;
704                         return(-1);
705                         }
706                 s->rwstate=SSL_NOTHING;
707
708                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
709                         {
710                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
711                         if (    !SSL_use_certificate(s,x509) || 
712                                 !SSL_use_PrivateKey(s,pkey))
713                                 {
714                                 i=0;
715                                 }
716                         X509_free(x509);
717                         EVP_PKEY_free(pkey);
718                         }
719                 else if (i == 1)
720                         {
721                         if (x509 != NULL) X509_free(x509);
722                         if (pkey != NULL) EVP_PKEY_free(pkey);
723                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
724                         i=0;
725                         }
726
727                 if (i == 0)
728                         {
729                         /* We have no client certificate to respond with
730                          * so send the correct error message back */
731                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
732                         p=buf;
733                         *(p++)=SSL2_MT_ERROR;
734                         s2n(SSL2_PE_NO_CERTIFICATE,p);
735                         s->init_off=0;
736                         s->init_num=3;
737                         /* Write is done at the end */
738                         }
739                 }
740
741         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
742                 {
743                 return(ssl2_do_write(s));
744                 }
745
746         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
747                 {
748                 EVP_MD_CTX ctx;
749
750                 /* ok, now we calculate the checksum
751                  * do it first so we can reuse buf :-) */
752                 p=buf;
753                 EVP_SignInit(&ctx,s->ctx->rsa_md5);
754                 EVP_SignUpdate(&ctx,s->s2->key_material,
755                         (unsigned int)s->s2->key_material_length);
756                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
757                 n=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
758                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
759
760                 p=buf;
761                 d=p+6;
762                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
763                 *(p++)=SSL2_CT_X509_CERTIFICATE;
764                 n=i2d_X509(s->cert->key->x509,&d);
765                 s2n(n,p);
766
767                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
768                         {
769                         /* this is not good.  If things have failed it
770                          * means there so something wrong with the key.
771                          * We will continue with a 0 length signature
772                          */
773                         }
774                 memset(&ctx,0,sizeof(ctx));
775                 s2n(n,p);
776                 d+=n;
777
778                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
779                 s->init_num=d-buf;
780                 s->init_off=0;
781                 }
782         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
783         return(ssl2_do_write(s));
784         }
785
786 static int get_server_verify(SSL *s)
787         {
788         unsigned char *p;
789         int i;
790
791         p=(unsigned char *)s->init_buf->data;
792         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
793                 {
794                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
795                 if (i < (1-s->init_num)) 
796                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
797
798                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
799                 s->init_num=0;
800                 if (*p != SSL2_MT_SERVER_VERIFY)
801                         {
802                         if (p[0] != SSL2_MT_ERROR)
803                                 {
804                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
805                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
806                                         SSL_R_READ_WRONG_PACKET_TYPE);
807                                 }
808                         else
809                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
810                                         SSL_R_PEER_ERROR);
811                         return(-1);
812                         }
813                 }
814         
815         p=(unsigned char *)s->init_buf->data;
816         i=ssl2_read(s,(char *)&(p[s->init_num]),
817                 (unsigned int)s->s2->challenge_length-s->init_num);
818         if (i < ((int)s->s2->challenge_length-s->init_num))
819                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
820         if (memcmp(p,s->s2->challenge,(unsigned int)s->s2->challenge_length) != 0)
821                 {
822                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
823                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
824                 return(-1);
825                 }
826         return(1);
827         }
828
829 static int get_server_finished(SSL *s)
830         {
831         unsigned char *buf;
832         unsigned char *p;
833         int i;
834
835         buf=(unsigned char *)s->init_buf->data;
836         p=buf;
837         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
838                 {
839                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
840                 if (i < (1-s->init_num))
841                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
842                 s->init_num=i;
843                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
844                         {
845                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
846                         return(1);
847                         }
848                 else if (*p != SSL2_MT_SERVER_FINISHED)
849                         {
850                         if (p[0] != SSL2_MT_ERROR)
851                                 {
852                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
853                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
854                                 }
855                         else
856                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
857                         return(-1);
858                         }
859                 s->state=SSL_ST_OK;
860                 s->init_num=0;
861                 }
862
863         i=ssl2_read(s,(char *)&(buf[s->init_num]),
864                 SSL2_SSL_SESSION_ID_LENGTH-s->init_num);
865         if (i < (SSL2_SSL_SESSION_ID_LENGTH-s->init_num))
866                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
867
868         if (!s->hit) /* new session */
869                 {
870                 /* new session-id */
871                 /* Make sure we were not trying to re-use an old SSL_SESSION
872                  * or bad things can happen */
873                 /* ZZZZZZZZZZZZZ */
874                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
875                 memcpy(s->session->session_id,p,SSL2_SSL_SESSION_ID_LENGTH);
876                 }
877         else
878                 {
879                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
880                         {
881                         if (memcmp(buf,s->session->session_id,
882                                 (unsigned int)s->session->session_id_length) != 0)
883                                 {
884                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
885                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
886                                 return(-1);
887                                 }
888                         }
889                 }
890         return(1);
891         }
892
893 /* loads in the certificate from the server */
894 int ssl2_set_certificate(SSL *s, int type, int len, unsigned char *data)
895         {
896         STACK_OF(X509) *sk=NULL;
897         EVP_PKEY *pkey=NULL;
898         SESS_CERT *sc=NULL;
899         int i;
900         X509 *x509=NULL;
901         int ret=0;
902         
903         x509=d2i_X509(NULL,&data,(long)len);
904         if (x509 == NULL)
905                 {
906                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
907                 goto err;
908                 }
909
910         if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
911                 {
912                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
913                 goto err;
914                 }
915
916         i=ssl_verify_cert_chain(s,sk);
917                 
918         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
919                 {
920                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
921                 goto err;
922                 }
923         ERR_clear_error(); /* but we keep s->verify_result */
924
925         /* server's cert for this session */
926         sc=ssl_sess_cert_new();
927         if (sc == NULL)
928                 {
929                 ret= -1;
930                 goto err;
931                 }
932         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
933         s->session->sess_cert=sc;
934
935         sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
936         sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
937
938         pkey=X509_get_pubkey(x509);
939         x509=NULL;
940         if (pkey == NULL)
941                 {
942                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
943                 goto err;
944                 }
945         if (pkey->type != EVP_PKEY_RSA)
946                 {
947                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
948                 goto err;
949                 }
950
951         if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
952                 goto err;
953         ret=1;
954 err:
955         sk_X509_free(sk);
956         X509_free(x509);
957         EVP_PKEY_free(pkey);
958         return(ret);
959         }
960
961 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
962              unsigned char *to, int padding)
963         {
964         EVP_PKEY *pkey=NULL;
965         int i= -1;
966
967         if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
968                 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
969                 {
970                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
971                 return(-1);
972                 }
973         if (pkey->type != EVP_PKEY_RSA)
974                 {
975                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
976                 goto end;
977                 }
978
979         /* we have the public key */
980         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
981         if (i < 0)
982                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
983 end:
984         EVP_PKEY_free(pkey);
985         return(i);
986         }
987 #else /* !NO_SSL2 */
988
989 # if PEDANTIC
990 static void *dummy=&dummy;
991 # endif
992
993 #endif