Import of openssl-0.9.8, a feature release.
[dragonfly.git] / crypto / openssl-0.9 / 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 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 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 SSL_METHOD *SSLv2_client_method(void)
141         {
142         static int init=1;
143         static SSL_METHOD SSLv2_client_data;
144
145         if (init)
146                 {
147                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
148
149                 if (init)
150                         {
151                         memcpy((char *)&SSLv2_client_data,(char *)sslv2_base_method(),
152                                 sizeof(SSL_METHOD));
153                         SSLv2_client_data.ssl_connect=ssl2_connect;
154                         SSLv2_client_data.get_ssl_method=ssl2_get_client_method;
155                         init=0;
156                         }
157
158                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
159                 }
160         return(&SSLv2_client_data);
161         }
162
163 int ssl2_connect(SSL *s)
164         {
165         unsigned long l=time(NULL);
166         BUF_MEM *buf=NULL;
167         int ret= -1;
168         void (*cb)(const SSL *ssl,int type,int val)=NULL;
169         int new_state,state;
170
171         RAND_add(&l,sizeof(l),0);
172         ERR_clear_error();
173         clear_sys_error();
174
175         if (s->info_callback != NULL)
176                 cb=s->info_callback;
177         else if (s->ctx->info_callback != NULL)
178                 cb=s->ctx->info_callback;
179
180         /* init things to blank */
181         s->in_handshake++;
182         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
183
184         for (;;)
185                 {
186                 state=s->state;
187
188                 switch (s->state)
189                         {
190                 case SSL_ST_BEFORE:
191                 case SSL_ST_CONNECT:
192                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
193                 case SSL_ST_OK|SSL_ST_CONNECT:
194
195                         s->server=0;
196                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
197
198                         s->version=SSL2_VERSION;
199                         s->type=SSL_ST_CONNECT;
200
201                         buf=s->init_buf;
202                         if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
203                                 {
204                                 ret= -1;
205                                 goto end;
206                                 }
207                         if (!BUF_MEM_grow(buf,
208                                 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
209                                 {
210                                 if (buf == s->init_buf)
211                                         buf=NULL;
212                                 ret= -1;
213                                 goto end;
214                                 }
215                         s->init_buf=buf;
216                         buf=NULL;
217                         s->init_num=0;
218                         s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
219                         s->ctx->stats.sess_connect++;
220                         s->handshake_func=ssl2_connect;
221                         BREAK;
222
223                 case SSL2_ST_SEND_CLIENT_HELLO_A:
224                 case SSL2_ST_SEND_CLIENT_HELLO_B:
225                         s->shutdown=0;
226                         ret=client_hello(s);
227                         if (ret <= 0) goto end;
228                         s->init_num=0;
229                         s->state=SSL2_ST_GET_SERVER_HELLO_A;
230                         BREAK;
231                 
232                 case SSL2_ST_GET_SERVER_HELLO_A:
233                 case SSL2_ST_GET_SERVER_HELLO_B:
234                         ret=get_server_hello(s);
235                         if (ret <= 0) goto end;
236                         s->init_num=0;
237                         if (!s->hit) /* new session */
238                                 {
239                                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
240                                 BREAK; 
241                                 }
242                         else
243                                 {
244                                 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
245                                 break;
246                                 }
247         
248                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
249                 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
250                         ret=client_master_key(s);
251                         if (ret <= 0) goto end;
252                         s->init_num=0;
253                         s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
254                         break;
255
256                 case SSL2_ST_CLIENT_START_ENCRYPTION:
257                         /* Ok, we now have all the stuff needed to
258                          * start encrypting, so lets fire it up :-) */
259                         if (!ssl2_enc_init(s,1))
260                                 {
261                                 ret= -1;
262                                 goto end;
263                                 }
264                         s->s2->clear_text=0;
265                         s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
266                         break;
267
268                 case SSL2_ST_SEND_CLIENT_FINISHED_A:
269                 case SSL2_ST_SEND_CLIENT_FINISHED_B:
270                         ret=client_finished(s);
271                         if (ret <= 0) goto end;
272                         s->init_num=0;
273                         s->state=SSL2_ST_GET_SERVER_VERIFY_A;
274                         break;
275
276                 case SSL2_ST_GET_SERVER_VERIFY_A:
277                 case SSL2_ST_GET_SERVER_VERIFY_B:
278                         ret=get_server_verify(s);
279                         if (ret <= 0) goto end;
280                         s->init_num=0;
281                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
282                         break;
283
284                 case SSL2_ST_GET_SERVER_FINISHED_A:
285                 case SSL2_ST_GET_SERVER_FINISHED_B:
286                         ret=get_server_finished(s);
287                         if (ret <= 0) goto end;
288                         break;
289
290                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
291                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
292                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
293                 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
294                 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
295                         ret=client_certificate(s);
296                         if (ret <= 0) goto end;
297                         s->init_num=0;
298                         s->state=SSL2_ST_GET_SERVER_FINISHED_A;
299                         break;
300
301                 case SSL_ST_OK:
302                         if (s->init_buf != NULL)
303                                 {
304                                 BUF_MEM_free(s->init_buf);
305                                 s->init_buf=NULL;
306                                 }
307                         s->init_num=0;
308                 /*      ERR_clear_error();*/
309
310                         /* If we want to cache session-ids in the client
311                          * and we successfully add the session-id to the
312                          * cache, and there is a callback, then pass it out.
313                          * 26/11/96 - eay - only add if not a re-used session.
314                          */
315
316                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
317                         if (s->hit) s->ctx->stats.sess_hit++;
318
319                         ret=1;
320                         /* s->server=0; */
321                         s->ctx->stats.sess_connect_good++;
322
323                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
324
325                         goto end;
326                         /* break; */
327                 default:
328                         SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
329                         return(-1);
330                         /* break; */
331                         }
332
333                 if ((cb != NULL) && (s->state != state))
334                         {
335                         new_state=s->state;
336                         s->state=state;
337                         cb(s,SSL_CB_CONNECT_LOOP,1);
338                         s->state=new_state;
339                         }
340                 }
341 end:
342         s->in_handshake--;
343         if (buf != NULL)
344                 BUF_MEM_free(buf);
345         if (cb != NULL) 
346                 cb(s,SSL_CB_CONNECT_EXIT,ret);
347         return(ret);
348         }
349
350 static int get_server_hello(SSL *s)
351         {
352         unsigned char *buf;
353         unsigned char *p;
354         int i,j;
355         unsigned long len;
356         STACK_OF(SSL_CIPHER) *sk=NULL,*cl, *prio, *allow;
357
358         buf=(unsigned char *)s->init_buf->data;
359         p=buf;
360         if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
361                 {
362                 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
363                 if (i < (11-s->init_num)) 
364                         return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
365                 s->init_num = 11;
366
367                 if (*(p++) != SSL2_MT_SERVER_HELLO)
368                         {
369                         if (p[-1] != SSL2_MT_ERROR)
370                                 {
371                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
372                                 SSLerr(SSL_F_GET_SERVER_HELLO,
373                                         SSL_R_READ_WRONG_PACKET_TYPE);
374                                 }
375                         else
376                                 SSLerr(SSL_F_GET_SERVER_HELLO,
377                                         SSL_R_PEER_ERROR);
378                         return(-1);
379                         }
380 #ifdef __APPLE_CC__
381                 /* The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug
382                  * workaround. <appro@fy.chalmers.se> */
383                 s->hit=(i=*(p++))?1:0;
384 #else
385                 s->hit=(*(p++))?1:0;
386 #endif
387                 s->s2->tmp.cert_type= *(p++);
388                 n2s(p,i);
389                 if (i < s->version) s->version=i;
390                 n2s(p,i); s->s2->tmp.cert_length=i;
391                 n2s(p,i); s->s2->tmp.csl=i;
392                 n2s(p,i); s->s2->tmp.conn_id_length=i;
393                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
394                 }
395
396         /* SSL2_ST_GET_SERVER_HELLO_B */
397         len = 11 + (unsigned long)s->s2->tmp.cert_length + (unsigned long)s->s2->tmp.csl + (unsigned long)s->s2->tmp.conn_id_length;
398         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
399                 {
400                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_MESSAGE_TOO_LONG);
401                 return -1;
402                 }
403         j = (int)len - s->init_num;
404         i = ssl2_read(s,(char *)&(buf[s->init_num]),j);
405         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
406         if (s->msg_callback)
407                 s->msg_callback(0, s->version, 0, buf, (size_t)len, s, s->msg_callback_arg); /* SERVER-HELLO */
408
409         /* things are looking good */
410
411         p = buf + 11;
412         if (s->hit)
413                 {
414                 if (s->s2->tmp.cert_length != 0) 
415                         {
416                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
417                         return(-1);
418                         }
419                 if (s->s2->tmp.cert_type != 0)
420                         {
421                         if (!(s->options &
422                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
423                                 {
424                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
425                                 return(-1);
426                                 }
427                         }
428                 if (s->s2->tmp.csl != 0)
429                         {
430                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
431                         return(-1);
432                         }
433                 }
434         else
435                 {
436 #ifdef undef
437                 /* very bad */
438                 memset(s->session->session_id,0,
439                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
440                 s->session->session_id_length=0;
441                 */
442 #endif
443
444                 /* we need to do this in case we were trying to reuse a 
445                  * client session but others are already reusing it.
446                  * If this was a new 'blank' session ID, the session-id
447                  * length will still be 0 */
448                 if (s->session->session_id_length > 0)
449                         {
450                         if (!ssl_get_new_session(s,0))
451                                 {
452                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
453                                 return(-1);
454                                 }
455                         }
456
457                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
458                         s->s2->tmp.cert_length,p) <= 0)
459                         {
460                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
461                         return(-1);
462                         }
463                 p+=s->s2->tmp.cert_length;
464
465                 if (s->s2->tmp.csl == 0)
466                         {
467                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
468                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
469                         return(-1);
470                         }
471
472                 /* We have just received a list of ciphers back from the
473                  * server.  We need to get the ones that match, then select
474                  * the one we want the most :-). */
475
476                 /* load the ciphers */
477                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
478                                             &s->session->ciphers);
479                 p+=s->s2->tmp.csl;
480                 if (sk == NULL)
481                         {
482                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
483                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
484                         return(-1);
485                         }
486
487                 sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
488
489                 /* get the array of ciphers we will accept */
490                 cl=SSL_get_ciphers(s);
491                 sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp);
492
493                 /*
494                  * If server preference flag set, choose the first
495                  * (highest priority) cipher the server sends, otherwise
496                  * client preference has priority.
497                  */
498                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
499                     {
500                     prio = sk;
501                     allow = cl;
502                     }
503                 else
504                     {
505                     prio = cl;
506                     allow = sk;
507                     }
508                 /* In theory we could have ciphers sent back that we
509                  * don't want to use but that does not matter since we
510                  * will check against the list we originally sent and
511                  * for performance reasons we should not bother to match
512                  * the two lists up just to check. */
513                 for (i=0; i<sk_SSL_CIPHER_num(prio); i++)
514                         {
515                         if (sk_SSL_CIPHER_find(allow,
516                                              sk_SSL_CIPHER_value(prio,i)) >= 0)
517                                 break;
518                         }
519
520                 if (i >= sk_SSL_CIPHER_num(prio))
521                         {
522                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
523                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
524                         return(-1);
525                         }
526                 s->session->cipher=sk_SSL_CIPHER_value(prio,i);
527
528
529                 if (s->session->peer != NULL) /* can't happen*/
530                         {
531                         ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
532                         SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
533                         return(-1);
534                         }
535
536                 s->session->peer = s->session->sess_cert->peer_key->x509;
537                 /* peer_key->x509 has been set by ssl2_set_certificate. */
538                 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
539                 }
540
541         if (s->session->peer != s->session->sess_cert->peer_key->x509)
542                 /* can't happen */
543                 {
544                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
545                 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
546                 return(-1);
547                 }
548                 
549         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
550         if (s->s2->conn_id_length > sizeof s->s2->conn_id)
551                 {
552                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
553                 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_SSL2_CONNECTION_ID_TOO_LONG);
554                 return -1;
555                 }
556         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
557         return(1);
558         }
559
560 static int client_hello(SSL *s)
561         {
562         unsigned char *buf;
563         unsigned char *p,*d;
564 /*      CIPHER **cipher;*/
565         int i,n,j;
566
567         buf=(unsigned char *)s->init_buf->data;
568         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
569                 {
570                 if ((s->session == NULL) ||
571                         (s->session->ssl_version != s->version))
572                         {
573                         if (!ssl_get_new_session(s,0))
574                                 {
575                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
576                                 return(-1);
577                                 }
578                         }
579                 /* else use the pre-loaded session */
580
581                 p=buf;                                  /* header */
582                 d=p+9;                                  /* data section */
583                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
584                 s2n(SSL2_VERSION,p);                    /* version */
585                 n=j=0;
586
587                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d,0);
588                 d+=n;
589
590                 if (n == 0)
591                         {
592                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
593                         return(-1);
594                         }
595
596                 s2n(n,p);                       /* cipher spec num bytes */
597
598                 if ((s->session->session_id_length > 0) &&
599                         (s->session->session_id_length <=
600                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
601                         {
602                         i=s->session->session_id_length;
603                         s2n(i,p);               /* session id length */
604                         memcpy(d,s->session->session_id,(unsigned int)i);
605                         d+=i;
606                         }
607                 else
608                         {
609                         s2n(0,p);
610                         }
611
612                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
613                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
614                 /*challenge id data*/
615                 if (RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH) <= 0)
616                         return -1;
617                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
618                 d+=SSL2_CHALLENGE_LENGTH;
619
620                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
621                 s->init_num=d-buf;
622                 s->init_off=0;
623                 }
624         /* SSL2_ST_SEND_CLIENT_HELLO_B */
625         return(ssl2_do_write(s));
626         }
627
628 static int client_master_key(SSL *s)
629         {
630         unsigned char *buf;
631         unsigned char *p,*d;
632         int clear,enc,karg,i;
633         SSL_SESSION *sess;
634         const EVP_CIPHER *c;
635         const EVP_MD *md;
636
637         buf=(unsigned char *)s->init_buf->data;
638         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
639                 {
640
641                 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
642                         {
643                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
644                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
645                         return(-1);
646                         }
647                 sess=s->session;
648                 p=buf;
649                 d=p+10;
650                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
651
652                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
653                 p+=i;
654
655                 /* make key_arg data */
656                 i=EVP_CIPHER_iv_length(c);
657                 sess->key_arg_length=i;
658                 if (i > SSL_MAX_KEY_ARG_LENGTH)
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 (i > 0)
665                         if (RAND_pseudo_bytes(sess->key_arg,i) <= 0)
666                                 return -1;
667
668                 /* make a master key */
669                 i=EVP_CIPHER_key_length(c);
670                 sess->master_key_length=i;
671                 if (i > 0)
672                         {
673                         if (i > (int)sizeof(sess->master_key))
674                                 {
675                                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
676                                 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
677                                 return -1;
678                                 }
679                         if (RAND_bytes(sess->master_key,i) <= 0)
680                                 {
681                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
682                                 return(-1);
683                                 }
684                         }
685
686                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
687                         enc=8;
688                 else if (SSL_C_IS_EXPORT(sess->cipher))
689                         enc=5;
690                 else
691                         enc=i;
692
693                 if ((int)i < enc)
694                         {
695                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
696                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
697                         return(-1);
698                         }
699                 clear=i-enc;
700                 s2n(clear,p);
701                 memcpy(d,sess->master_key,(unsigned int)clear);
702                 d+=clear;
703
704                 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
705                         &(sess->master_key[clear]),d,
706                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
707                 if (enc <= 0)
708                         {
709                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
710                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
711                         return(-1);
712                         }
713 #ifdef PKCS1_CHECK
714                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
715                 if (s->options & SSL_OP_PKCS1_CHECK_2)
716                         sess->master_key[clear]++;
717 #endif
718                 s2n(enc,p);
719                 d+=enc;
720                 karg=sess->key_arg_length;      
721                 s2n(karg,p); /* key arg size */
722                 if (karg > (int)sizeof(sess->key_arg))
723                         {
724                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
725                         SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
726                         return -1;
727                         }
728                 memcpy(d,sess->key_arg,(unsigned int)karg);
729                 d+=karg;
730
731                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
732                 s->init_num=d-buf;
733                 s->init_off=0;
734                 }
735
736         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
737         return(ssl2_do_write(s));
738         }
739
740 static int client_finished(SSL *s)
741         {
742         unsigned char *p;
743
744         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
745                 {
746                 p=(unsigned char *)s->init_buf->data;
747                 *(p++)=SSL2_MT_CLIENT_FINISHED;
748                 if (s->s2->conn_id_length > sizeof s->s2->conn_id)
749                         {
750                         SSLerr(SSL_F_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
751                         return -1;
752                         }
753                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
754
755                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
756                 s->init_num=s->s2->conn_id_length+1;
757                 s->init_off=0;
758                 }
759         return(ssl2_do_write(s));
760         }
761
762 /* read the data and then respond */
763 static int client_certificate(SSL *s)
764         {
765         unsigned char *buf;
766         unsigned char *p,*d;
767         int i;
768         unsigned int n;
769         int cert_ch_len;
770         unsigned char *cert_ch;
771
772         buf=(unsigned char *)s->init_buf->data;
773
774         /* We have a cert associated with the SSL, so attach it to
775          * the session if it does not have one */
776
777         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
778                 {
779                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
780                         SSL2_MAX_CERT_CHALLENGE_LENGTH+2-s->init_num);
781                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+2-s->init_num))
782                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
783                 s->init_num += i;
784                 if (s->msg_callback)
785                         s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* REQUEST-CERTIFICATE */
786
787                 /* type=buf[0]; */
788                 /* type eq x509 */
789                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
790                         {
791                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
792                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
793                         return(-1);
794                         }
795
796                 if ((s->cert == NULL) ||
797                         (s->cert->key->x509 == NULL) ||
798                         (s->cert->key->privatekey == NULL))
799                         {
800                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
801                         }
802                 else
803                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
804                 }
805
806         cert_ch = buf + 2;
807         cert_ch_len = s->init_num - 2;
808
809         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
810                 {
811                 X509 *x509=NULL;
812                 EVP_PKEY *pkey=NULL;
813
814                 /* If we get an error we need to
815                  * ssl->rwstate=SSL_X509_LOOKUP;
816                  * return(error);
817                  * We should then be retried when things are ok and we
818                  * can get a cert or not */
819
820                 i=0;
821                 if (s->ctx->client_cert_cb != NULL)
822                         {
823                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
824                         }
825
826                 if (i < 0)
827                         {
828                         s->rwstate=SSL_X509_LOOKUP;
829                         return(-1);
830                         }
831                 s->rwstate=SSL_NOTHING;
832
833                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
834                         {
835                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
836                         if (    !SSL_use_certificate(s,x509) || 
837                                 !SSL_use_PrivateKey(s,pkey))
838                                 {
839                                 i=0;
840                                 }
841                         X509_free(x509);
842                         EVP_PKEY_free(pkey);
843                         }
844                 else if (i == 1)
845                         {
846                         if (x509 != NULL) X509_free(x509);
847                         if (pkey != NULL) EVP_PKEY_free(pkey);
848                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
849                         i=0;
850                         }
851
852                 if (i == 0)
853                         {
854                         /* We have no client certificate to respond with
855                          * so send the correct error message back */
856                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
857                         p=buf;
858                         *(p++)=SSL2_MT_ERROR;
859                         s2n(SSL2_PE_NO_CERTIFICATE,p);
860                         s->init_off=0;
861                         s->init_num=3;
862                         /* Write is done at the end */
863                         }
864                 }
865
866         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
867                 {
868                 return(ssl2_do_write(s));
869                 }
870
871         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
872                 {
873                 EVP_MD_CTX ctx;
874
875                 /* ok, now we calculate the checksum
876                  * do it first so we can reuse buf :-) */
877                 p=buf;
878                 EVP_MD_CTX_init(&ctx);
879                 EVP_SignInit_ex(&ctx,s->ctx->rsa_md5, NULL);
880                 EVP_SignUpdate(&ctx,s->s2->key_material,
881                                s->s2->key_material_length);
882                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
883                 n=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
884                 EVP_SignUpdate(&ctx,buf,(unsigned int)n);
885
886                 p=buf;
887                 d=p+6;
888                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
889                 *(p++)=SSL2_CT_X509_CERTIFICATE;
890                 n=i2d_X509(s->cert->key->x509,&d);
891                 s2n(n,p);
892
893                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
894                         {
895                         /* this is not good.  If things have failed it
896                          * means there so something wrong with the key.
897                          * We will continue with a 0 length signature
898                          */
899                         }
900                 EVP_MD_CTX_cleanup(&ctx);
901                 s2n(n,p);
902                 d+=n;
903
904                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
905                 s->init_num=d-buf;
906                 s->init_off=0;
907                 }
908         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
909         return(ssl2_do_write(s));
910         }
911
912 static int get_server_verify(SSL *s)
913         {
914         unsigned char *p;
915         int i, n, len;
916
917         p=(unsigned char *)s->init_buf->data;
918         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
919                 {
920                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
921                 if (i < (1-s->init_num)) 
922                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
923                 s->init_num += i;
924
925                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
926                 if (*p != SSL2_MT_SERVER_VERIFY)
927                         {
928                         if (p[0] != SSL2_MT_ERROR)
929                                 {
930                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
931                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
932                                         SSL_R_READ_WRONG_PACKET_TYPE);
933                                 }
934                         else
935                                 {
936                                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_PEER_ERROR);
937                                 /* try to read the error message */
938                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
939                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
940                                 }
941                         return(-1);
942                         }
943                 }
944         
945         p=(unsigned char *)s->init_buf->data;
946         len = 1 + s->s2->challenge_length;
947         n =  len - s->init_num;
948         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
949         if (i < n)
950                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
951         if (s->msg_callback)
952                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* SERVER-VERIFY */
953         p += 1;
954
955         if (memcmp(p,s->s2->challenge,s->s2->challenge_length) != 0)
956                 {
957                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
958                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
959                 return(-1);
960                 }
961         return(1);
962         }
963
964 static int get_server_finished(SSL *s)
965         {
966         unsigned char *buf;
967         unsigned char *p;
968         int i, n, len;
969
970         buf=(unsigned char *)s->init_buf->data;
971         p=buf;
972         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
973                 {
974                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
975                 if (i < (1-s->init_num))
976                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
977                 s->init_num += i;
978
979                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
980                         {
981                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
982                         return(1);
983                         }
984                 else if (*p != SSL2_MT_SERVER_FINISHED)
985                         {
986                         if (p[0] != SSL2_MT_ERROR)
987                                 {
988                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
989                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
990                                 }
991                         else
992                                 {
993                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
994                                 /* try to read the error message */
995                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
996                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
997                                 }
998                         return(-1);
999                         }
1000                 s->state=SSL2_ST_GET_SERVER_FINISHED_B;
1001                 }
1002
1003         len = 1 + SSL2_SSL_SESSION_ID_LENGTH;
1004         n = len - s->init_num;
1005         i = ssl2_read(s,(char *)&(buf[s->init_num]), n);
1006         if (i < n) /* XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, that's the maximum */
1007                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
1008         s->init_num += i;
1009         if (s->msg_callback)
1010                 s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* SERVER-FINISHED */
1011
1012         if (!s->hit) /* new session */
1013                 {
1014                 /* new session-id */
1015                 /* Make sure we were not trying to re-use an old SSL_SESSION
1016                  * or bad things can happen */
1017                 /* ZZZZZZZZZZZZZ */
1018                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
1019                 memcpy(s->session->session_id,p+1,SSL2_SSL_SESSION_ID_LENGTH);
1020                 }
1021         else
1022                 {
1023                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
1024                         {
1025                         if ((s->session->session_id_length > sizeof s->session->session_id)
1026                             || (0 != memcmp(buf + 1, s->session->session_id,
1027                                             (unsigned int)s->session->session_id_length)))
1028                                 {
1029                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
1030                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
1031                                 return(-1);
1032                                 }
1033                         }
1034                 }
1035         s->state = SSL_ST_OK;
1036         return(1);
1037         }
1038
1039 /* loads in the certificate from the server */
1040 int ssl2_set_certificate(SSL *s, int type, int len, const unsigned char *data)
1041         {
1042         STACK_OF(X509) *sk=NULL;
1043         EVP_PKEY *pkey=NULL;
1044         SESS_CERT *sc=NULL;
1045         int i;
1046         X509 *x509=NULL;
1047         int ret=0;
1048         
1049         x509=d2i_X509(NULL,&data,(long)len);
1050         if (x509 == NULL)
1051                 {
1052                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
1053                 goto err;
1054                 }
1055
1056         if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
1057                 {
1058                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1059                 goto err;
1060                 }
1061
1062         i=ssl_verify_cert_chain(s,sk);
1063                 
1064         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i))
1065                 {
1066                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1067                 goto err;
1068                 }
1069         ERR_clear_error(); /* but we keep s->verify_result */
1070         s->session->verify_result = s->verify_result;
1071
1072         /* server's cert for this session */
1073         sc=ssl_sess_cert_new();
1074         if (sc == NULL)
1075                 {
1076                 ret= -1;
1077                 goto err;
1078                 }
1079         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1080         s->session->sess_cert=sc;
1081
1082         sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
1083         sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
1084
1085         pkey=X509_get_pubkey(x509);
1086         x509=NULL;
1087         if (pkey == NULL)
1088                 {
1089                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
1090                 goto err;
1091                 }
1092         if (pkey->type != EVP_PKEY_RSA)
1093                 {
1094                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
1095                 goto err;
1096                 }
1097
1098         if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
1099                 goto err;
1100         ret=1;
1101 err:
1102         sk_X509_free(sk);
1103         X509_free(x509);
1104         EVP_PKEY_free(pkey);
1105         return(ret);
1106         }
1107
1108 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
1109              unsigned char *to, int padding)
1110         {
1111         EVP_PKEY *pkey=NULL;
1112         int i= -1;
1113
1114         if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
1115                 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
1116                 {
1117                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
1118                 return(-1);
1119                 }
1120         if (pkey->type != EVP_PKEY_RSA)
1121                 {
1122                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1123                 goto end;
1124                 }
1125
1126         /* we have the public key */
1127         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
1128         if (i < 0)
1129                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
1130 end:
1131         EVP_PKEY_free(pkey);
1132         return(i);
1133         }
1134 #else /* !OPENSSL_NO_SSL2 */
1135
1136 # if PEDANTIC
1137 static void *dummy=&dummy;
1138 # endif
1139
1140 #endif