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s2_clnt.c
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1 /* ssl/s2_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young ([email protected])
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young ([email protected]).
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 ([email protected]).
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 ([email protected])"
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 ([email protected])"
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  * [email protected].
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  * ([email protected]). This product includes software written by Tim
108  * Hudson ([email protected]).
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. <[email protected]> */
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
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