Only set current certificate to valid values.
[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  * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111
112 #include "ssl_locl.h"
113 #ifndef OPENSSL_NO_SSL2
114 #include <stdio.h>
115 #include <openssl/rand.h>
116 #include <openssl/buffer.h>
117 #include <openssl/objects.h>
118 #include <openssl/evp.h>
119
120 static const SSL_METHOD *ssl2_get_client_method(int ver);
121 static int get_server_finished(SSL *s);
122 static int get_server_verify(SSL *s);
123 static int get_server_hello(SSL *s);
124 static int client_hello(SSL *s); 
125 static int client_master_key(SSL *s);
126 static int client_finished(SSL *s);
127 static int client_certificate(SSL *s);
128 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
129         unsigned char *to,int padding);
130 #define BREAK   break
131
132 static const SSL_METHOD *ssl2_get_client_method(int ver)
133         {
134         if (ver == SSL2_VERSION)
135                 return(SSLv2_client_method());
136         else
137                 return(NULL);
138         }
139
140 IMPLEMENT_ssl2_meth_func(SSLv2_client_method,
141                         ssl_undefined_function,
142                         ssl2_connect,
143                         ssl2_get_client_method)
144
145 int ssl2_connect(SSL *s)
146         {
147         unsigned long l=(unsigned long)time(NULL);
148         BUF_MEM *buf=NULL;
149         int ret= -1;
150         void (*cb)(const SSL *ssl,int type,int val)=NULL;
151         int new_state,state;
152
153         RAND_add(&l,sizeof(l),0);
154         ERR_clear_error();
155         clear_sys_error();
156
157         if (s->info_callback != NULL)
158                 cb=s->info_callback;
159         else if (s->ctx->info_callback != NULL)
160                 cb=s->ctx->info_callback;
161
162         /* init things to blank */
163         s->in_handshake++;
164         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
165
166         for (;;)
167                 {
168                 state=s->state;
169
170                 switch (s->state)
171                         {
172                 case SSL_ST_BEFORE:
173                 case SSL_ST_CONNECT:
174                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
175                 case SSL_ST_OK|SSL_ST_CONNECT:
176
177                         s->server=0;
178                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
179
180                         s->version=SSL2_VERSION;
181                         s->type=SSL_ST_CONNECT;
182
183                         buf=s->init_buf;
184                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
185                                 {
186                                 ret= -1;
187                                 goto end;
188                                 }
189                         if (!BUF_MEM_grow(buf,
190                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
191                                 {
192                                 if (buf == s->init_buf)
193                                         buf=NULL;
194                                 ret= -1;
195                                 goto end;
196                                 }
197                         s->init_buf=buf;
198                         buf=NULL;
199                         s->init_num=0;
200                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
201                         s->ctx->stats.sess_connect++;
202                         s->handshake_func=ssl2_connect;
203                         BREAK;
204
205                 case SSL2_ST_SEND_CLIENT_HELLO_A:
206                 case SSL2_ST_SEND_CLIENT_HELLO_B:
207                         s->shutdown=0;
208                         ret=client_hello(s);
209                         if (ret <= 0) goto end;
210                         s->init_num=0;
211                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
212                         BREAK;
213                 
214                 case SSL2_ST_GET_SERVER_HELLO_A:
215                 case SSL2_ST_GET_SERVER_HELLO_B:
216                         ret=get_server_hello(s);
217                         if (ret <= 0) goto end;
218                         s->init_num=0;
219                         if (!s->hit) /* new session */
220                                 {
221                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
222                                 BREAK; 
223                                 }
224                         else
225                                 {
226                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
227                                 break;
228                                 }
229         
230                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
231                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
232                         ret=client_master_key(s);
233                         if (ret <= 0) goto end;
234                         s->init_num=0;
235                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
236                         break;
237
238                 case SSL2_ST_CLIENT_START_ENCRYPTION:
239                         /* Ok, we now have all the stuff needed to
240                          * start encrypting, so lets fire it up :-) */
241                         if (!ssl2_enc_init(s,1))
242                                 {
243                                 ret= -1;
244                                 goto end;
245                                 }
246                         s->s2->clear_text=0;
247                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
248                         break;
249
250                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
251                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
252                         ret=client_finished(s);
253                         if (ret <= 0) goto end;
254                         s->init_num=0;
255                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
256                         break;
257
258                 case SSL2_ST_GET_SERVER_VERIFY_A:
259                 case SSL2_ST_GET_SERVER_VERIFY_B:
260                         ret=get_server_verify(s);
261                         if (ret <= 0) goto end;
262                         s->init_num=0;
263                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
264                         break;
265
266                 case SSL2_ST_GET_SERVER_FINISHED_A:
267                 case SSL2_ST_GET_SERVER_FINISHED_B:
268                         ret=get_server_finished(s);
269                         if (ret <= 0) goto end;
270                         break;
271
272                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
273                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
274                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
275                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
276                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
277                         ret=client_certificate(s);
278                         if (ret <= 0) goto end;
279                         s->init_num=0;
280                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
281                         break;
282
283                 case SSL_ST_OK:
284                         if (s->init_buf != NULL)
285                                 {
286                                 BUF_MEM_free(s->init_buf);
287                                 s->init_buf=NULL;
288                                 }
289                         s->init_num=0;
290                 /*      ERR_clear_error();*/
291
292                         /* If we want to cache session-ids in the client
293                          * and we successfully add the session-id to the
294                          * cache, and there is a callback, then pass it out.
295                          * 26/11/96 - eay - only add if not a re-used session.
296                          */
297
298                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
299                         if (s->hit) s->ctx->stats.sess_hit++;
300
301                         ret=1;
302                         /* s->server=0; */
303                         s->ctx->stats.sess_connect_good++;
304
305                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
306
307                         goto end;
308                         /* break; */
309                 default:
310                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
311                         return(-1);
312                         /* break; */
313                         }
314
315                 if ((cb != NULL) && (s->state != state))
316                         {
317                         new_state=s->state;
318                         s->state=state;
319                         cb(s,SSL_CB_CONNECT_LOOP,1);
320                         s->state=new_state;
321                         }
322                 }
323 end:
324         s->in_handshake--;
325         if (buf != NULL)
326                 BUF_MEM_free(buf);
327         if (cb != NULL) 
328                 cb(s,SSL_CB_CONNECT_EXIT,ret);
329         return(ret);
330         }
331
332 static int get_server_hello(SSL *s)
333         {
334         unsigned char *buf;
335         unsigned char *p;
336         int i,j;
337         unsigned long len;
338         STACK_OF(SSL_CIPHER) *sk=NULL,*cl, *prio, *allow;
339
340         buf=(unsigned char *)s->init_buf->data;
341         p=buf;
342         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
343                 {
344                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
345                 if (i < (11-s->init_num)) 
346                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
347                 s->init_num = 11;
348
349                 if (*(p++) != SSL2_MT_SERVER_HELLO)
350                         {
351                         if (p[-1] != SSL2_MT_ERROR)
352                                 {
353                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
354                                 SSLerr(SSL_F_GET_SERVER_HELLO,
355                                         SSL_R_READ_WRONG_PACKET_TYPE);
356                                 }
357                         else
358                                 SSLerr(SSL_F_GET_SERVER_HELLO,
359                                         SSL_R_PEER_ERROR);
360                         return(-1);
361                         }
362 #if 0
363                 s->hit=(*(p++))?1:0;
364                 /* Some [PPC?] compilers fail to increment p in above
365                    statement, e.g. one provided with Rhapsody 5.5, but
366                    most recent example XL C 11.1 for AIX, even without
367                    optimization flag... */
368 #else
369                 s->hit=(*p)?1:0; p++;
370 #endif
371                 s->s2->tmp.cert_type= *(p++);
372                 n2s(p,i);
373                 if (i < s->version) s->version=i;
374                 n2s(p,i); s->s2->tmp.cert_length=i;
375                 n2s(p,i); s->s2->tmp.csl=i;
376                 n2s(p,i); s->s2->tmp.conn_id_length=i;
377                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
378                 }
379
380         /* SSL2_ST_GET_SERVER_HELLO_B */
381         len = 11 + (unsigned long)s->s2->tmp.cert_length + (unsigned long)s->s2->tmp.csl + (unsigned long)s->s2->tmp.conn_id_length;
382         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
383                 {
384                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_MESSAGE_TOO_LONG);
385                 return -1;
386                 }
387         j = (int)len - s->init_num;
388         i = ssl2_read(s,(char *)&(buf[s->init_num]),j);
389         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
390         if (s->msg_callback)
391                 s->msg_callback(0, s->version, 0, buf, (size_t)len, s, s->msg_callback_arg); /* SERVER-HELLO */
392
393         /* things are looking good */
394
395         p = buf + 11;
396         if (s->hit)
397                 {
398                 if (s->s2->tmp.cert_length != 0) 
399                         {
400                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
401                         return(-1);
402                         }
403                 if (s->s2->tmp.cert_type != 0)
404                         {
405                         if (!(s->options &
406                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
407                                 {
408                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
409                                 return(-1);
410                                 }
411                         }
412                 if (s->s2->tmp.csl != 0)
413                         {
414                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
415                         return(-1);
416                         }
417                 }
418         else
419                 {
420 #ifdef undef
421                 /* very bad */
422                 memset(s->session->session_id,0,
423                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
424                 s->session->session_id_length=0;
425                 */
426 #endif
427
428                 /* we need to do this in case we were trying to reuse a 
429                  * client session but others are already reusing it.
430                  * If this was a new 'blank' session ID, the session-id
431                  * length will still be 0 */
432                 if (s->session->session_id_length > 0)
433                         {
434                         if (!ssl_get_new_session(s,0))
435                                 {
436                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
437                                 return(-1);
438                                 }
439                         }
440
441                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
442                         s->s2->tmp.cert_length,p) <= 0)
443                         {
444                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
445                         return(-1);
446                         }
447                 p+=s->s2->tmp.cert_length;
448
449                 if (s->s2->tmp.csl == 0)
450                         {
451                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
452                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
453                         return(-1);
454                         }
455
456                 /* We have just received a list of ciphers back from the
457                  * server.  We need to get the ones that match, then select
458                  * the one we want the most :-). */
459
460                 /* load the ciphers */
461                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
462                                             &s->session->ciphers);
463                 p+=s->s2->tmp.csl;
464                 if (sk == NULL)
465                         {
466                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
467                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
468                         return(-1);
469                         }
470
471                 (void)sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
472
473                 /* get the array of ciphers we will accept */
474                 cl=SSL_get_ciphers(s);
475                 (void)sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp);
476
477                 /*
478                  * If server preference flag set, choose the first
479                  * (highest priority) cipher the server sends, otherwise
480                  * client preference has priority.
481                  */
482                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
483                     {
484                     prio = sk;
485                     allow = cl;
486                     }
487                 else
488                     {
489                     prio = cl;
490                     allow = sk;
491                     }
492                 /* In theory we could have ciphers sent back that we
493                  * don't want to use but that does not matter since we
494                  * will check against the list we originally sent and
495                  * for performance reasons we should not bother to match
496                  * the two lists up just to check. */
497                 for (i=0; i<sk_SSL_CIPHER_num(prio); i++)
498                         {
499                         if (sk_SSL_CIPHER_find(allow,
500                                              sk_SSL_CIPHER_value(prio,i)) >= 0)
501                                 break;
502                         }
503
504                 if (i >= sk_SSL_CIPHER_num(prio))
505                         {
506                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
507                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
508                         return(-1);
509                         }
510                 s->session->cipher=sk_SSL_CIPHER_value(prio,i);
511
512
513                 if (s->session->peer != NULL) /* can't happen*/
514                         {
515                         ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
516                         SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
517                         return(-1);
518                         }
519
520                 s->session->peer = s->session->sess_cert->peer_key->x509;
521                 /* peer_key->x509 has been set by ssl2_set_certificate. */
522                 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
523                 }
524
525         if (s->session->sess_cert == NULL 
526       || s->session->peer != s->session->sess_cert->peer_key->x509)
527                 /* can't happen */
528                 {
529                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
530                 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
531                 return(-1);
532                 }
533                 
534         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
535         if (s->s2->conn_id_length > sizeof s->s2->conn_id)
536                 {
537                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
538                 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_SSL2_CONNECTION_ID_TOO_LONG);
539                 return -1;
540                 }
541         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
542         return(1);
543         }
544
545 static int client_hello(SSL *s)
546         {
547         unsigned char *buf;
548         unsigned char *p,*d;
549 /*      CIPHER **cipher;*/
550         int i,n,j;
551
552         buf=(unsigned char *)s->init_buf->data;
553         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
554                 {
555                 if ((s->session == NULL) ||
556                         (s->session->ssl_version != s->version))
557                         {
558                         if (!ssl_get_new_session(s,0))
559                                 {
560                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
561                                 return(-1);
562                                 }
563                         }
564                 /* else use the pre-loaded session */
565
566                 p=buf;                                  /* header */
567                 d=p+9;                                  /* data section */
568                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
569                 s2n(SSL2_VERSION,p);                    /* version */
570                 n=j=0;
571
572                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d,0);
573                 d+=n;
574
575                 if (n == 0)
576                         {
577                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
578                         return(-1);
579                         }
580
581                 s2n(n,p);                       /* cipher spec num bytes */
582
583                 if ((s->session->session_id_length > 0) &&
584                         (s->session->session_id_length <=
585                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
586                         {
587                         i=s->session->session_id_length;
588                         s2n(i,p);               /* session id length */
589                         memcpy(d,s->session->session_id,(unsigned int)i);
590                         d+=i;
591                         }
592                 else
593                         {
594                         s2n(0,p);
595                         }
596
597                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
598                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
599                 /*challenge id data*/
600                 if (RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH) <= 0)
601                         return -1;
602                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
603                 d+=SSL2_CHALLENGE_LENGTH;
604
605                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
606                 s->init_num=d-buf;
607                 s->init_off=0;
608                 }
609         /* SSL2_ST_SEND_CLIENT_HELLO_B */
610         return(ssl2_do_write(s));
611         }
612
613 static int client_master_key(SSL *s)
614         {
615         unsigned char *buf;
616         unsigned char *p,*d;
617         int clear,enc,karg,i;
618         SSL_SESSION *sess;
619         const EVP_CIPHER *c;
620         const EVP_MD *md;
621
622         buf=(unsigned char *)s->init_buf->data;
623         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
624                 {
625
626                 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL, 0))
627                         {
628                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
629                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
630                         return(-1);
631                         }
632                 sess=s->session;
633                 p=buf;
634                 d=p+10;
635                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
636
637                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
638                 p+=i;
639
640                 /* make key_arg data */
641                 i=EVP_CIPHER_iv_length(c);
642                 sess->key_arg_length=i;
643                 if (i > SSL_MAX_KEY_ARG_LENGTH)
644                         {
645                         ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
646                         SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
647                         return -1;
648                         }
649                 if (i > 0)
650                         if (RAND_pseudo_bytes(sess->key_arg,i) <= 0)
651                                 return -1;
652
653                 /* make a master key */
654                 i=EVP_CIPHER_key_length(c);
655                 sess->master_key_length=i;
656                 if (i > 0)
657                         {
658                         if (i > (int)sizeof(sess->master_key))
659                                 {
660                                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
661                                 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
662                                 return -1;
663                                 }
664                         if (RAND_bytes(sess->master_key,i) <= 0)
665                                 {
666                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
667                                 return(-1);
668                                 }
669                         }
670
671                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
672                         enc=8;
673                 else if (SSL_C_IS_EXPORT(sess->cipher))
674                         enc=5;
675                 else
676                         enc=i;
677
678                 if ((int)i < enc)
679                         {
680                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
681                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
682                         return(-1);
683                         }
684                 clear=i-enc;
685                 s2n(clear,p);
686                 memcpy(d,sess->master_key,(unsigned int)clear);
687                 d+=clear;
688
689                 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
690                         &(sess->master_key[clear]),d,
691                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
692                 if (enc <= 0)
693                         {
694                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
695                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
696                         return(-1);
697                         }
698 #ifdef PKCS1_CHECK
699                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
700                 if (s->options & SSL_OP_PKCS1_CHECK_2)
701                         sess->master_key[clear]++;
702 #endif
703                 s2n(enc,p);
704                 d+=enc;
705                 karg=sess->key_arg_length;      
706                 s2n(karg,p); /* key arg size */
707                 if (karg > (int)sizeof(sess->key_arg))
708                         {
709                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
710                         SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
711                         return -1;
712                         }
713                 memcpy(d,sess->key_arg,(unsigned int)karg);
714                 d+=karg;
715
716                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
717                 s->init_num=d-buf;
718                 s->init_off=0;
719                 }
720
721         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
722         return(ssl2_do_write(s));
723         }
724
725 static int client_finished(SSL *s)
726         {
727         unsigned char *p;
728
729         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
730                 {
731                 p=(unsigned char *)s->init_buf->data;
732                 *(p++)=SSL2_MT_CLIENT_FINISHED;
733                 if (s->s2->conn_id_length > sizeof s->s2->conn_id)
734                         {
735                         SSLerr(SSL_F_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
736                         return -1;
737                         }
738                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
739
740                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
741                 s->init_num=s->s2->conn_id_length+1;
742                 s->init_off=0;
743                 }
744         return(ssl2_do_write(s));
745         }
746
747 /* read the data and then respond */
748 static int client_certificate(SSL *s)
749         {
750         unsigned char *buf;
751         unsigned char *p,*d;
752         int i;
753         unsigned int n;
754         int cert_ch_len;
755         unsigned char *cert_ch;
756
757         buf=(unsigned char *)s->init_buf->data;
758
759         /* We have a cert associated with the SSL, so attach it to
760          * the session if it does not have one */
761
762         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
763                 {
764                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
765                         SSL2_MAX_CERT_CHALLENGE_LENGTH+2-s->init_num);
766                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+2-s->init_num))
767                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
768                 s->init_num += i;
769                 if (s->msg_callback)
770                         s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* REQUEST-CERTIFICATE */
771
772                 /* type=buf[0]; */
773                 /* type eq x509 */
774                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
775                         {
776                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
777                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
778                         return(-1);
779                         }
780
781                 if ((s->cert == NULL) ||
782                         (s->cert->key->x509 == NULL) ||
783                         (s->cert->key->privatekey == NULL))
784                         {
785                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
786                         }
787                 else
788                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
789                 }
790
791         cert_ch = buf + 2;
792         cert_ch_len = s->init_num - 2;
793
794         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
795                 {
796                 X509 *x509=NULL;
797                 EVP_PKEY *pkey=NULL;
798
799                 /* If we get an error we need to
800                  * ssl->rwstate=SSL_X509_LOOKUP;
801                  * return(error);
802                  * We should then be retried when things are ok and we
803                  * can get a cert or not */
804
805                 i=0;
806                 if (s->ctx->client_cert_cb != NULL)
807                         {
808                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
809                         }
810
811                 if (i < 0)
812                         {
813                         s->rwstate=SSL_X509_LOOKUP;
814                         return(-1);
815                         }
816                 s->rwstate=SSL_NOTHING;
817
818                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
819                         {
820                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
821                         if (    !SSL_use_certificate(s,x509) || 
822                                 !SSL_use_PrivateKey(s,pkey))
823                                 {
824                                 i=0;
825                                 }
826                         X509_free(x509);
827                         EVP_PKEY_free(pkey);
828                         }
829                 else if (i == 1)
830                         {
831                         if (x509 != NULL) X509_free(x509);
832                         if (pkey != NULL) EVP_PKEY_free(pkey);
833                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
834                         i=0;
835                         }
836
837                 if (i == 0)
838                         {
839                         /* We have no client certificate to respond with
840                          * so send the correct error message back */
841                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
842                         p=buf;
843                         *(p++)=SSL2_MT_ERROR;
844                         s2n(SSL2_PE_NO_CERTIFICATE,p);
845                         s->init_off=0;
846                         s->init_num=3;
847                         /* Write is done at the end */
848                         }
849                 }
850
851         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
852                 {
853                 return(ssl2_do_write(s));
854                 }
855
856         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
857                 {
858                 EVP_MD_CTX ctx;
859
860                 /* ok, now we calculate the checksum
861                  * do it first so we can reuse buf :-) */
862                 p=buf;
863                 EVP_MD_CTX_init(&ctx);
864                 EVP_SignInit_ex(&ctx,s->ctx->rsa_md5, NULL);
865                 EVP_SignUpdate(&ctx,s->s2->key_material,
866                                s->s2->key_material_length);
867                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
868                 i=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
869                 /* Don't update the signature if it fails - FIXME: probably should handle this better */
870                 if(i > 0)
871                         EVP_SignUpdate(&ctx,buf,(unsigned int)i);
872
873                 p=buf;
874                 d=p+6;
875                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
876                 *(p++)=SSL2_CT_X509_CERTIFICATE;
877                 n=i2d_X509(s->cert->key->x509,&d);
878                 s2n(n,p);
879
880                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
881                         {
882                         /* this is not good.  If things have failed it
883                          * means there so something wrong with the key.
884                          * We will continue with a 0 length signature
885                          */
886                         }
887                 EVP_MD_CTX_cleanup(&ctx);
888                 s2n(n,p);
889                 d+=n;
890
891                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
892                 s->init_num=d-buf;
893                 s->init_off=0;
894                 }
895         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
896         return(ssl2_do_write(s));
897         }
898
899 static int get_server_verify(SSL *s)
900         {
901         unsigned char *p;
902         int i, n, len;
903
904         p=(unsigned char *)s->init_buf->data;
905         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
906                 {
907                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
908                 if (i < (1-s->init_num)) 
909                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
910                 s->init_num += i;
911
912                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
913                 if (*p != SSL2_MT_SERVER_VERIFY)
914                         {
915                         if (p[0] != SSL2_MT_ERROR)
916                                 {
917                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
918                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
919                                         SSL_R_READ_WRONG_PACKET_TYPE);
920                                 }
921                         else
922                                 {
923                                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_PEER_ERROR);
924                                 /* try to read the error message */
925                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
926                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
927                                 }
928                         return(-1);
929                         }
930                 }
931         
932         p=(unsigned char *)s->init_buf->data;
933         len = 1 + s->s2->challenge_length;
934         n =  len - s->init_num;
935         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
936         if (i < n)
937                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
938         if (s->msg_callback)
939                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* SERVER-VERIFY */
940         p += 1;
941
942         if (CRYPTO_memcmp(p,s->s2->challenge,s->s2->challenge_length) != 0)
943                 {
944                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
945                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
946                 return(-1);
947                 }
948         return(1);
949         }
950
951 static int get_server_finished(SSL *s)
952         {
953         unsigned char *buf;
954         unsigned char *p;
955         int i, n, len;
956
957         buf=(unsigned char *)s->init_buf->data;
958         p=buf;
959         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
960                 {
961                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
962                 if (i < (1-s->init_num))
963                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
964                 s->init_num += i;
965
966                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
967                         {
968                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
969                         return(1);
970                         }
971                 else if (*p != SSL2_MT_SERVER_FINISHED)
972                         {
973                         if (p[0] != SSL2_MT_ERROR)
974                                 {
975                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
976                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
977                                 }
978                         else
979                                 {
980                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
981                                 /* try to read the error message */
982                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
983                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
984                                 }
985                         return(-1);
986                         }
987                 s->state=SSL2_ST_GET_SERVER_FINISHED_B;
988                 }
989
990         len = 1 + SSL2_SSL_SESSION_ID_LENGTH;
991         n = len - s->init_num;
992         i = ssl2_read(s,(char *)&(buf[s->init_num]), n);
993         if (i < n) /* XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, that's the maximum */
994                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
995         s->init_num += i;
996         if (s->msg_callback)
997                 s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* SERVER-FINISHED */
998
999         if (!s->hit) /* new session */
1000                 {
1001                 /* new session-id */
1002                 /* Make sure we were not trying to re-use an old SSL_SESSION
1003                  * or bad things can happen */
1004                 /* ZZZZZZZZZZZZZ */
1005                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
1006                 memcpy(s->session->session_id,p+1,SSL2_SSL_SESSION_ID_LENGTH);
1007                 }
1008         else
1009                 {
1010                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
1011                         {
1012                         if ((s->session->session_id_length > sizeof s->session->session_id)
1013                             || (0 != memcmp(buf + 1, s->session->session_id,
1014                                             (unsigned int)s->session->session_id_length)))
1015                                 {
1016                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
1017                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
1018                                 return(-1);
1019                                 }
1020                         }
1021                 }
1022         s->state = SSL_ST_OK;
1023         return(1);
1024         }
1025
1026 /* loads in the certificate from the server */
1027 int ssl2_set_certificate(SSL *s, int type, int len, const unsigned char *data)
1028         {
1029         STACK_OF(X509) *sk=NULL;
1030         EVP_PKEY *pkey=NULL;
1031         SESS_CERT *sc=NULL;
1032         int i;
1033         X509 *x509=NULL;
1034         int ret=0;
1035         
1036         x509=d2i_X509(NULL,&data,(long)len);
1037         if (x509 == NULL)
1038                 {
1039                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
1040                 goto err;
1041                 }
1042
1043         if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
1044                 {
1045                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1046                 goto err;
1047                 }
1048
1049         i=ssl_verify_cert_chain(s,sk);
1050                 
1051         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0))
1052                 {
1053                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1054                 goto err;
1055                 }
1056         ERR_clear_error(); /* but we keep s->verify_result */
1057         s->session->verify_result = s->verify_result;
1058
1059         /* server's cert for this session */
1060         sc=ssl_sess_cert_new();
1061         if (sc == NULL)
1062                 {
1063                 ret= -1;
1064                 goto err;
1065                 }
1066         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1067         s->session->sess_cert=sc;
1068
1069         sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
1070         sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
1071
1072         pkey=X509_get_pubkey(x509);
1073         x509=NULL;
1074         if (pkey == NULL)
1075                 {
1076                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
1077                 goto err;
1078                 }
1079         if (pkey->type != EVP_PKEY_RSA)
1080                 {
1081                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
1082                 goto err;
1083                 }
1084
1085         if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
1086                 goto err;
1087         ret=1;
1088 err:
1089         sk_X509_free(sk);
1090         X509_free(x509);
1091         EVP_PKEY_free(pkey);
1092         return(ret);
1093         }
1094
1095 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
1096              unsigned char *to, int padding)
1097         {
1098         EVP_PKEY *pkey=NULL;
1099         int i= -1;
1100
1101         if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
1102                 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
1103                 {
1104                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
1105                 return(-1);
1106                 }
1107         if (pkey->type != EVP_PKEY_RSA)
1108                 {
1109                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1110                 goto end;
1111                 }
1112
1113         /* we have the public key */
1114         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
1115         if (i < 0)
1116                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
1117 end:
1118         EVP_PKEY_free(pkey);
1119         return(i);
1120         }
1121 #else /* !OPENSSL_NO_SSL2 */
1122
1123 # if PEDANTIC
1124 static void *dummy=&dummy;
1125 # endif
1126
1127 #endif