Note SRP support.
[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 #ifdef __APPLE_CC__
363                 /* The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug
364                  * workaround. <appro@fy.chalmers.se> */
365                 s->hit=(i=*(p++))?1:0;
366 #else
367                 s->hit=(*(p++))?1:0;
368 #endif
369                 s->s2->tmp.cert_type= *(p++);
370                 n2s(p,i);
371                 if (i < s->version) s->version=i;
372                 n2s(p,i); s->s2->tmp.cert_length=i;
373                 n2s(p,i); s->s2->tmp.csl=i;
374                 n2s(p,i); s->s2->tmp.conn_id_length=i;
375                 s->state=SSL2_ST_GET_SERVER_HELLO_B;
376                 }
377
378         /* SSL2_ST_GET_SERVER_HELLO_B */
379         len = 11 + (unsigned long)s->s2->tmp.cert_length + (unsigned long)s->s2->tmp.csl + (unsigned long)s->s2->tmp.conn_id_length;
380         if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
381                 {
382                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_MESSAGE_TOO_LONG);
383                 return -1;
384                 }
385         j = (int)len - s->init_num;
386         i = ssl2_read(s,(char *)&(buf[s->init_num]),j);
387         if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
388         if (s->msg_callback)
389                 s->msg_callback(0, s->version, 0, buf, (size_t)len, s, s->msg_callback_arg); /* SERVER-HELLO */
390
391         /* things are looking good */
392
393         p = buf + 11;
394         if (s->hit)
395                 {
396                 if (s->s2->tmp.cert_length != 0) 
397                         {
398                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
399                         return(-1);
400                         }
401                 if (s->s2->tmp.cert_type != 0)
402                         {
403                         if (!(s->options &
404                                 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
405                                 {
406                                 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
407                                 return(-1);
408                                 }
409                         }
410                 if (s->s2->tmp.csl != 0)
411                         {
412                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
413                         return(-1);
414                         }
415                 }
416         else
417                 {
418 #ifdef undef
419                 /* very bad */
420                 memset(s->session->session_id,0,
421                         SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
422                 s->session->session_id_length=0;
423                 */
424 #endif
425
426                 /* we need to do this in case we were trying to reuse a 
427                  * client session but others are already reusing it.
428                  * If this was a new 'blank' session ID, the session-id
429                  * length will still be 0 */
430                 if (s->session->session_id_length > 0)
431                         {
432                         if (!ssl_get_new_session(s,0))
433                                 {
434                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
435                                 return(-1);
436                                 }
437                         }
438
439                 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
440                         s->s2->tmp.cert_length,p) <= 0)
441                         {
442                         ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
443                         return(-1);
444                         }
445                 p+=s->s2->tmp.cert_length;
446
447                 if (s->s2->tmp.csl == 0)
448                         {
449                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
450                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
451                         return(-1);
452                         }
453
454                 /* We have just received a list of ciphers back from the
455                  * server.  We need to get the ones that match, then select
456                  * the one we want the most :-). */
457
458                 /* load the ciphers */
459                 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
460                                             &s->session->ciphers);
461                 p+=s->s2->tmp.csl;
462                 if (sk == NULL)
463                         {
464                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
465                         SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
466                         return(-1);
467                         }
468
469                 (void)sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
470
471                 /* get the array of ciphers we will accept */
472                 cl=SSL_get_ciphers(s);
473                 (void)sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp);
474
475                 /*
476                  * If server preference flag set, choose the first
477                  * (highest priority) cipher the server sends, otherwise
478                  * client preference has priority.
479                  */
480                 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
481                     {
482                     prio = sk;
483                     allow = cl;
484                     }
485                 else
486                     {
487                     prio = cl;
488                     allow = sk;
489                     }
490                 /* In theory we could have ciphers sent back that we
491                  * don't want to use but that does not matter since we
492                  * will check against the list we originally sent and
493                  * for performance reasons we should not bother to match
494                  * the two lists up just to check. */
495                 for (i=0; i<sk_SSL_CIPHER_num(prio); i++)
496                         {
497                         if (sk_SSL_CIPHER_find(allow,
498                                              sk_SSL_CIPHER_value(prio,i)) >= 0)
499                                 break;
500                         }
501
502                 if (i >= sk_SSL_CIPHER_num(prio))
503                         {
504                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
505                         SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
506                         return(-1);
507                         }
508                 s->session->cipher=sk_SSL_CIPHER_value(prio,i);
509
510
511                 if (s->session->peer != NULL) /* can't happen*/
512                         {
513                         ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
514                         SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
515                         return(-1);
516                         }
517
518                 s->session->peer = s->session->sess_cert->peer_key->x509;
519                 /* peer_key->x509 has been set by ssl2_set_certificate. */
520                 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
521                 }
522
523         if (s->session->sess_cert == NULL 
524       || s->session->peer != s->session->sess_cert->peer_key->x509)
525                 /* can't happen */
526                 {
527                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
528                 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
529                 return(-1);
530                 }
531                 
532         s->s2->conn_id_length=s->s2->tmp.conn_id_length;
533         if (s->s2->conn_id_length > sizeof s->s2->conn_id)
534                 {
535                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
536                 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_SSL2_CONNECTION_ID_TOO_LONG);
537                 return -1;
538                 }
539         memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
540         return(1);
541         }
542
543 static int client_hello(SSL *s)
544         {
545         unsigned char *buf;
546         unsigned char *p,*d;
547 /*      CIPHER **cipher;*/
548         int i,n,j;
549
550         buf=(unsigned char *)s->init_buf->data;
551         if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
552                 {
553                 if ((s->session == NULL) ||
554                         (s->session->ssl_version != s->version))
555                         {
556                         if (!ssl_get_new_session(s,0))
557                                 {
558                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
559                                 return(-1);
560                                 }
561                         }
562                 /* else use the pre-loaded session */
563
564                 p=buf;                                  /* header */
565                 d=p+9;                                  /* data section */
566                 *(p++)=SSL2_MT_CLIENT_HELLO;            /* type */
567                 s2n(SSL2_VERSION,p);                    /* version */
568                 n=j=0;
569
570                 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d,0);
571                 d+=n;
572
573                 if (n == 0)
574                         {
575                         SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
576                         return(-1);
577                         }
578
579                 s2n(n,p);                       /* cipher spec num bytes */
580
581                 if ((s->session->session_id_length > 0) &&
582                         (s->session->session_id_length <=
583                         SSL2_MAX_SSL_SESSION_ID_LENGTH))
584                         {
585                         i=s->session->session_id_length;
586                         s2n(i,p);               /* session id length */
587                         memcpy(d,s->session->session_id,(unsigned int)i);
588                         d+=i;
589                         }
590                 else
591                         {
592                         s2n(0,p);
593                         }
594
595                 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
596                 s2n(SSL2_CHALLENGE_LENGTH,p);           /* challenge length */
597                 /*challenge id data*/
598                 if (RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH) <= 0)
599                         return -1;
600                 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
601                 d+=SSL2_CHALLENGE_LENGTH;
602
603                 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
604                 s->init_num=d-buf;
605                 s->init_off=0;
606                 }
607         /* SSL2_ST_SEND_CLIENT_HELLO_B */
608         return(ssl2_do_write(s));
609         }
610
611 static int client_master_key(SSL *s)
612         {
613         unsigned char *buf;
614         unsigned char *p,*d;
615         int clear,enc,karg,i;
616         SSL_SESSION *sess;
617         const EVP_CIPHER *c;
618         const EVP_MD *md;
619
620         buf=(unsigned char *)s->init_buf->data;
621         if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
622                 {
623
624                 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL))
625                         {
626                         ssl2_return_error(s,SSL2_PE_NO_CIPHER);
627                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
628                         return(-1);
629                         }
630                 sess=s->session;
631                 p=buf;
632                 d=p+10;
633                 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
634
635                 i=ssl_put_cipher_by_char(s,sess->cipher,p);
636                 p+=i;
637
638                 /* make key_arg data */
639                 i=EVP_CIPHER_iv_length(c);
640                 sess->key_arg_length=i;
641                 if (i > SSL_MAX_KEY_ARG_LENGTH)
642                         {
643                         ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
644                         SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
645                         return -1;
646                         }
647                 if (i > 0)
648                         if (RAND_pseudo_bytes(sess->key_arg,i) <= 0)
649                                 return -1;
650
651                 /* make a master key */
652                 i=EVP_CIPHER_key_length(c);
653                 sess->master_key_length=i;
654                 if (i > 0)
655                         {
656                         if (i > (int)sizeof(sess->master_key))
657                                 {
658                                 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
659                                 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
660                                 return -1;
661                                 }
662                         if (RAND_bytes(sess->master_key,i) <= 0)
663                                 {
664                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
665                                 return(-1);
666                                 }
667                         }
668
669                 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
670                         enc=8;
671                 else if (SSL_C_IS_EXPORT(sess->cipher))
672                         enc=5;
673                 else
674                         enc=i;
675
676                 if ((int)i < enc)
677                         {
678                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
679                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
680                         return(-1);
681                         }
682                 clear=i-enc;
683                 s2n(clear,p);
684                 memcpy(d,sess->master_key,(unsigned int)clear);
685                 d+=clear;
686
687                 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
688                         &(sess->master_key[clear]),d,
689                         (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
690                 if (enc <= 0)
691                         {
692                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
693                         SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
694                         return(-1);
695                         }
696 #ifdef PKCS1_CHECK
697                 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
698                 if (s->options & SSL_OP_PKCS1_CHECK_2)
699                         sess->master_key[clear]++;
700 #endif
701                 s2n(enc,p);
702                 d+=enc;
703                 karg=sess->key_arg_length;      
704                 s2n(karg,p); /* key arg size */
705                 if (karg > (int)sizeof(sess->key_arg))
706                         {
707                         ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
708                         SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
709                         return -1;
710                         }
711                 memcpy(d,sess->key_arg,(unsigned int)karg);
712                 d+=karg;
713
714                 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
715                 s->init_num=d-buf;
716                 s->init_off=0;
717                 }
718
719         /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
720         return(ssl2_do_write(s));
721         }
722
723 static int client_finished(SSL *s)
724         {
725         unsigned char *p;
726
727         if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
728                 {
729                 p=(unsigned char *)s->init_buf->data;
730                 *(p++)=SSL2_MT_CLIENT_FINISHED;
731                 if (s->s2->conn_id_length > sizeof s->s2->conn_id)
732                         {
733                         SSLerr(SSL_F_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
734                         return -1;
735                         }
736                 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
737
738                 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
739                 s->init_num=s->s2->conn_id_length+1;
740                 s->init_off=0;
741                 }
742         return(ssl2_do_write(s));
743         }
744
745 /* read the data and then respond */
746 static int client_certificate(SSL *s)
747         {
748         unsigned char *buf;
749         unsigned char *p,*d;
750         int i;
751         unsigned int n;
752         int cert_ch_len;
753         unsigned char *cert_ch;
754
755         buf=(unsigned char *)s->init_buf->data;
756
757         /* We have a cert associated with the SSL, so attach it to
758          * the session if it does not have one */
759
760         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
761                 {
762                 i=ssl2_read(s,(char *)&(buf[s->init_num]),
763                         SSL2_MAX_CERT_CHALLENGE_LENGTH+2-s->init_num);
764                 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+2-s->init_num))
765                         return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
766                 s->init_num += i;
767                 if (s->msg_callback)
768                         s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* REQUEST-CERTIFICATE */
769
770                 /* type=buf[0]; */
771                 /* type eq x509 */
772                 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
773                         {
774                         ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
775                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
776                         return(-1);
777                         }
778
779                 if ((s->cert == NULL) ||
780                         (s->cert->key->x509 == NULL) ||
781                         (s->cert->key->privatekey == NULL))
782                         {
783                         s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
784                         }
785                 else
786                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
787                 }
788
789         cert_ch = buf + 2;
790         cert_ch_len = s->init_num - 2;
791
792         if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
793                 {
794                 X509 *x509=NULL;
795                 EVP_PKEY *pkey=NULL;
796
797                 /* If we get an error we need to
798                  * ssl->rwstate=SSL_X509_LOOKUP;
799                  * return(error);
800                  * We should then be retried when things are ok and we
801                  * can get a cert or not */
802
803                 i=0;
804                 if (s->ctx->client_cert_cb != NULL)
805                         {
806                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
807                         }
808
809                 if (i < 0)
810                         {
811                         s->rwstate=SSL_X509_LOOKUP;
812                         return(-1);
813                         }
814                 s->rwstate=SSL_NOTHING;
815
816                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
817                         {
818                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
819                         if (    !SSL_use_certificate(s,x509) || 
820                                 !SSL_use_PrivateKey(s,pkey))
821                                 {
822                                 i=0;
823                                 }
824                         X509_free(x509);
825                         EVP_PKEY_free(pkey);
826                         }
827                 else if (i == 1)
828                         {
829                         if (x509 != NULL) X509_free(x509);
830                         if (pkey != NULL) EVP_PKEY_free(pkey);
831                         SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
832                         i=0;
833                         }
834
835                 if (i == 0)
836                         {
837                         /* We have no client certificate to respond with
838                          * so send the correct error message back */
839                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
840                         p=buf;
841                         *(p++)=SSL2_MT_ERROR;
842                         s2n(SSL2_PE_NO_CERTIFICATE,p);
843                         s->init_off=0;
844                         s->init_num=3;
845                         /* Write is done at the end */
846                         }
847                 }
848
849         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
850                 {
851                 return(ssl2_do_write(s));
852                 }
853
854         if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
855                 {
856                 EVP_MD_CTX ctx;
857
858                 /* ok, now we calculate the checksum
859                  * do it first so we can reuse buf :-) */
860                 p=buf;
861                 EVP_MD_CTX_init(&ctx);
862                 EVP_SignInit_ex(&ctx,s->ctx->rsa_md5, NULL);
863                 EVP_SignUpdate(&ctx,s->s2->key_material,
864                                s->s2->key_material_length);
865                 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
866                 i=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
867                 /* Don't update the signature if it fails - FIXME: probably should handle this better */
868                 if(i > 0)
869                         EVP_SignUpdate(&ctx,buf,(unsigned int)i);
870
871                 p=buf;
872                 d=p+6;
873                 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
874                 *(p++)=SSL2_CT_X509_CERTIFICATE;
875                 n=i2d_X509(s->cert->key->x509,&d);
876                 s2n(n,p);
877
878                 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
879                         {
880                         /* this is not good.  If things have failed it
881                          * means there so something wrong with the key.
882                          * We will continue with a 0 length signature
883                          */
884                         }
885                 EVP_MD_CTX_cleanup(&ctx);
886                 s2n(n,p);
887                 d+=n;
888
889                 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
890                 s->init_num=d-buf;
891                 s->init_off=0;
892                 }
893         /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
894         return(ssl2_do_write(s));
895         }
896
897 static int get_server_verify(SSL *s)
898         {
899         unsigned char *p;
900         int i, n, len;
901
902         p=(unsigned char *)s->init_buf->data;
903         if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
904                 {
905                 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
906                 if (i < (1-s->init_num)) 
907                         return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
908                 s->init_num += i;
909
910                 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
911                 if (*p != SSL2_MT_SERVER_VERIFY)
912                         {
913                         if (p[0] != SSL2_MT_ERROR)
914                                 {
915                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
916                                 SSLerr(SSL_F_GET_SERVER_VERIFY,
917                                         SSL_R_READ_WRONG_PACKET_TYPE);
918                                 }
919                         else
920                                 {
921                                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_PEER_ERROR);
922                                 /* try to read the error message */
923                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
924                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
925                                 }
926                         return(-1);
927                         }
928                 }
929         
930         p=(unsigned char *)s->init_buf->data;
931         len = 1 + s->s2->challenge_length;
932         n =  len - s->init_num;
933         i = ssl2_read(s,(char *)&(p[s->init_num]),n);
934         if (i < n)
935                 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
936         if (s->msg_callback)
937                 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* SERVER-VERIFY */
938         p += 1;
939
940         if (memcmp(p,s->s2->challenge,s->s2->challenge_length) != 0)
941                 {
942                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
943                 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
944                 return(-1);
945                 }
946         return(1);
947         }
948
949 static int get_server_finished(SSL *s)
950         {
951         unsigned char *buf;
952         unsigned char *p;
953         int i, n, len;
954
955         buf=(unsigned char *)s->init_buf->data;
956         p=buf;
957         if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
958                 {
959                 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
960                 if (i < (1-s->init_num))
961                         return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
962                 s->init_num += i;
963
964                 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
965                         {
966                         s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
967                         return(1);
968                         }
969                 else if (*p != SSL2_MT_SERVER_FINISHED)
970                         {
971                         if (p[0] != SSL2_MT_ERROR)
972                                 {
973                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
974                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
975                                 }
976                         else
977                                 {
978                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
979                                 /* try to read the error message */
980                                 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
981                                 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
982                                 }
983                         return(-1);
984                         }
985                 s->state=SSL2_ST_GET_SERVER_FINISHED_B;
986                 }
987
988         len = 1 + SSL2_SSL_SESSION_ID_LENGTH;
989         n = len - s->init_num;
990         i = ssl2_read(s,(char *)&(buf[s->init_num]), n);
991         if (i < n) /* XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, that's the maximum */
992                 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
993         s->init_num += i;
994         if (s->msg_callback)
995                 s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* SERVER-FINISHED */
996
997         if (!s->hit) /* new session */
998                 {
999                 /* new session-id */
1000                 /* Make sure we were not trying to re-use an old SSL_SESSION
1001                  * or bad things can happen */
1002                 /* ZZZZZZZZZZZZZ */
1003                 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
1004                 memcpy(s->session->session_id,p+1,SSL2_SSL_SESSION_ID_LENGTH);
1005                 }
1006         else
1007                 {
1008                 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
1009                         {
1010                         if ((s->session->session_id_length > sizeof s->session->session_id)
1011                             || (0 != memcmp(buf + 1, s->session->session_id,
1012                                             (unsigned int)s->session->session_id_length)))
1013                                 {
1014                                 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
1015                                 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
1016                                 return(-1);
1017                                 }
1018                         }
1019                 }
1020         s->state = SSL_ST_OK;
1021         return(1);
1022         }
1023
1024 /* loads in the certificate from the server */
1025 int ssl2_set_certificate(SSL *s, int type, int len, const unsigned char *data)
1026         {
1027         STACK_OF(X509) *sk=NULL;
1028         EVP_PKEY *pkey=NULL;
1029         SESS_CERT *sc=NULL;
1030         int i;
1031         X509 *x509=NULL;
1032         int ret=0;
1033         
1034         x509=d2i_X509(NULL,&data,(long)len);
1035         if (x509 == NULL)
1036                 {
1037                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
1038                 goto err;
1039                 }
1040
1041         if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
1042                 {
1043                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1044                 goto err;
1045                 }
1046
1047         i=ssl_verify_cert_chain(s,sk);
1048                 
1049         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0))
1050                 {
1051                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1052                 goto err;
1053                 }
1054         ERR_clear_error(); /* but we keep s->verify_result */
1055         s->session->verify_result = s->verify_result;
1056
1057         /* server's cert for this session */
1058         sc=ssl_sess_cert_new();
1059         if (sc == NULL)
1060                 {
1061                 ret= -1;
1062                 goto err;
1063                 }
1064         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1065         s->session->sess_cert=sc;
1066
1067         sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
1068         sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
1069
1070         pkey=X509_get_pubkey(x509);
1071         x509=NULL;
1072         if (pkey == NULL)
1073                 {
1074                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
1075                 goto err;
1076                 }
1077         if (pkey->type != EVP_PKEY_RSA)
1078                 {
1079                 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
1080                 goto err;
1081                 }
1082
1083         if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
1084                 goto err;
1085         ret=1;
1086 err:
1087         sk_X509_free(sk);
1088         X509_free(x509);
1089         EVP_PKEY_free(pkey);
1090         return(ret);
1091         }
1092
1093 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
1094              unsigned char *to, int padding)
1095         {
1096         EVP_PKEY *pkey=NULL;
1097         int i= -1;
1098
1099         if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
1100                 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
1101                 {
1102                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
1103                 return(-1);
1104                 }
1105         if (pkey->type != EVP_PKEY_RSA)
1106                 {
1107                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1108                 goto end;
1109                 }
1110
1111         /* we have the public key */
1112         i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
1113         if (i < 0)
1114                 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
1115 end:
1116         EVP_PKEY_free(pkey);
1117         return(i);
1118         }
1119 #else /* !OPENSSL_NO_SSL2 */
1120
1121 # if PEDANTIC
1122 static void *dummy=&dummy;
1123 # endif
1124
1125 #endif