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
ssl2_get_client_method(int ver)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
SSLv2_client_method(void)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
ssl2_connect(SSL * s)163 int ssl2_connect(SSL *s)
164 {
165 BUF_MEM *buf=NULL;
166 int ret= -1;
167 void (*cb)(const SSL *ssl,int type,int val)=NULL;
168 int new_state,state;
169
170 RAND_add(NULL, 0, 0);
171 ERR_clear_error();
172 clear_sys_error();
173
174 if (s->info_callback != NULL)
175 cb=s->info_callback;
176 else if (s->ctx->info_callback != NULL)
177 cb=s->ctx->info_callback;
178
179 /* init things to blank */
180 s->in_handshake++;
181 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
182
183 for (;;)
184 {
185 state=s->state;
186
187 switch (s->state)
188 {
189 case SSL_ST_BEFORE:
190 case SSL_ST_CONNECT:
191 case SSL_ST_BEFORE|SSL_ST_CONNECT:
192 case SSL_ST_OK|SSL_ST_CONNECT:
193
194 s->server=0;
195 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
196
197 s->version=SSL2_VERSION;
198 s->type=SSL_ST_CONNECT;
199
200 buf=s->init_buf;
201 if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
202 {
203 ret= -1;
204 goto end;
205 }
206 if (!BUF_MEM_grow(buf,
207 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
208 {
209 if (buf == s->init_buf)
210 buf=NULL;
211 ret= -1;
212 goto end;
213 }
214 s->init_buf=buf;
215 buf=NULL;
216 s->init_num=0;
217 s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
218 s->ctx->stats.sess_connect++;
219 s->handshake_func=ssl2_connect;
220 BREAK;
221
222 case SSL2_ST_SEND_CLIENT_HELLO_A:
223 case SSL2_ST_SEND_CLIENT_HELLO_B:
224 s->shutdown=0;
225 ret=client_hello(s);
226 if (ret <= 0) goto end;
227 s->init_num=0;
228 s->state=SSL2_ST_GET_SERVER_HELLO_A;
229 BREAK;
230
231 case SSL2_ST_GET_SERVER_HELLO_A:
232 case SSL2_ST_GET_SERVER_HELLO_B:
233 ret=get_server_hello(s);
234 if (ret <= 0) goto end;
235 s->init_num=0;
236 if (!s->hit) /* new session */
237 {
238 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
239 BREAK;
240 }
241 else
242 {
243 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
244 break;
245 }
246
247 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
248 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
249 ret=client_master_key(s);
250 if (ret <= 0) goto end;
251 s->init_num=0;
252 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
253 break;
254
255 case SSL2_ST_CLIENT_START_ENCRYPTION:
256 /* Ok, we now have all the stuff needed to
257 * start encrypting, so lets fire it up :-) */
258 if (!ssl2_enc_init(s,1))
259 {
260 ret= -1;
261 goto end;
262 }
263 s->s2->clear_text=0;
264 s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
265 break;
266
267 case SSL2_ST_SEND_CLIENT_FINISHED_A:
268 case SSL2_ST_SEND_CLIENT_FINISHED_B:
269 ret=client_finished(s);
270 if (ret <= 0) goto end;
271 s->init_num=0;
272 s->state=SSL2_ST_GET_SERVER_VERIFY_A;
273 break;
274
275 case SSL2_ST_GET_SERVER_VERIFY_A:
276 case SSL2_ST_GET_SERVER_VERIFY_B:
277 ret=get_server_verify(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 SSL2_ST_GET_SERVER_FINISHED_A:
284 case SSL2_ST_GET_SERVER_FINISHED_B:
285 ret=get_server_finished(s);
286 if (ret <= 0) goto end;
287 break;
288
289 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
290 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
291 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
292 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
293 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
294 ret=client_certificate(s);
295 if (ret <= 0) goto end;
296 s->init_num=0;
297 s->state=SSL2_ST_GET_SERVER_FINISHED_A;
298 break;
299
300 case SSL_ST_OK:
301 if (s->init_buf != NULL)
302 {
303 BUF_MEM_free(s->init_buf);
304 s->init_buf=NULL;
305 }
306 s->init_num=0;
307 /* ERR_clear_error();*/
308
309 /* If we want to cache session-ids in the client
310 * and we successfully add the session-id to the
311 * cache, and there is a callback, then pass it out.
312 * 26/11/96 - eay - only add if not a re-used session.
313 */
314
315 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
316 if (s->hit) s->ctx->stats.sess_hit++;
317
318 ret=1;
319 /* s->server=0; */
320 s->ctx->stats.sess_connect_good++;
321
322 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
323
324 goto end;
325 /* break; */
326 default:
327 SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
328 return(-1);
329 /* break; */
330 }
331
332 if ((cb != NULL) && (s->state != state))
333 {
334 new_state=s->state;
335 s->state=state;
336 cb(s,SSL_CB_CONNECT_LOOP,1);
337 s->state=new_state;
338 }
339 }
340 end:
341 s->in_handshake--;
342 if (buf != NULL)
343 BUF_MEM_free(buf);
344 if (cb != NULL)
345 cb(s,SSL_CB_CONNECT_EXIT,ret);
346 return(ret);
347 }
348
get_server_hello(SSL * s)349 static int get_server_hello(SSL *s)
350 {
351 unsigned char *buf;
352 unsigned char *p;
353 int i,j;
354 unsigned long len;
355 STACK_OF(SSL_CIPHER) *sk=NULL,*cl, *prio, *allow;
356
357 buf=(unsigned char *)s->init_buf->data;
358 p=buf;
359 if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
360 {
361 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
362 if (i < (11-s->init_num))
363 return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
364 s->init_num = 11;
365
366 if (*(p++) != SSL2_MT_SERVER_HELLO)
367 {
368 if (p[-1] != SSL2_MT_ERROR)
369 {
370 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
371 SSLerr(SSL_F_GET_SERVER_HELLO,
372 SSL_R_READ_WRONG_PACKET_TYPE);
373 }
374 else
375 SSLerr(SSL_F_GET_SERVER_HELLO,
376 SSL_R_PEER_ERROR);
377 return(-1);
378 }
379 #ifdef __APPLE_CC__
380 /* The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug
381 * workaround. <appro@fy.chalmers.se> */
382 s->hit=(i=*(p++))?1:0;
383 #else
384 s->hit=(*(p++))?1:0;
385 #endif
386 s->s2->tmp.cert_type= *(p++);
387 n2s(p,i);
388 if (i < s->version) s->version=i;
389 n2s(p,i); s->s2->tmp.cert_length=i;
390 n2s(p,i); s->s2->tmp.csl=i;
391 n2s(p,i); s->s2->tmp.conn_id_length=i;
392 s->state=SSL2_ST_GET_SERVER_HELLO_B;
393 }
394
395 /* SSL2_ST_GET_SERVER_HELLO_B */
396 len = 11 + (unsigned long)s->s2->tmp.cert_length + (unsigned long)s->s2->tmp.csl + (unsigned long)s->s2->tmp.conn_id_length;
397 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
398 {
399 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_MESSAGE_TOO_LONG);
400 return -1;
401 }
402 j = (int)len - s->init_num;
403 i = ssl2_read(s,(char *)&(buf[s->init_num]),j);
404 if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
405 if (s->msg_callback)
406 s->msg_callback(0, s->version, 0, buf, (size_t)len, s, s->msg_callback_arg); /* SERVER-HELLO */
407
408 /* things are looking good */
409
410 p = buf + 11;
411 if (s->hit)
412 {
413 if (s->s2->tmp.cert_length != 0)
414 {
415 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
416 return(-1);
417 }
418 if (s->s2->tmp.cert_type != 0)
419 {
420 if (!(s->options &
421 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
422 {
423 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
424 return(-1);
425 }
426 }
427 if (s->s2->tmp.csl != 0)
428 {
429 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
430 return(-1);
431 }
432 }
433 else
434 {
435 #ifdef undef
436 /* very bad */
437 memset(s->session->session_id,0,
438 SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
439 s->session->session_id_length=0;
440 */
441 #endif
442
443 /* we need to do this in case we were trying to reuse a
444 * client session but others are already reusing it.
445 * If this was a new 'blank' session ID, the session-id
446 * length will still be 0 */
447 if (s->session->session_id_length > 0)
448 {
449 if (!ssl_get_new_session(s,0))
450 {
451 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
452 return(-1);
453 }
454 }
455
456 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
457 s->s2->tmp.cert_length,p) <= 0)
458 {
459 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
460 return(-1);
461 }
462 p+=s->s2->tmp.cert_length;
463
464 if (s->s2->tmp.csl == 0)
465 {
466 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
467 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
468 return(-1);
469 }
470
471 /* We have just received a list of ciphers back from the
472 * server. We need to get the ones that match, then select
473 * the one we want the most :-). */
474
475 /* load the ciphers */
476 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
477 &s->session->ciphers);
478 p+=s->s2->tmp.csl;
479 if (sk == NULL)
480 {
481 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
482 SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
483 return(-1);
484 }
485
486 sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
487
488 /* get the array of ciphers we will accept */
489 cl=SSL_get_ciphers(s);
490 sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp);
491
492 /*
493 * If server preference flag set, choose the first
494 * (highest priority) cipher the server sends, otherwise
495 * client preference has priority.
496 */
497 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
498 {
499 prio = sk;
500 allow = cl;
501 }
502 else
503 {
504 prio = cl;
505 allow = sk;
506 }
507 /* In theory we could have ciphers sent back that we
508 * don't want to use but that does not matter since we
509 * will check against the list we originally sent and
510 * for performance reasons we should not bother to match
511 * the two lists up just to check. */
512 for (i=0; i<sk_SSL_CIPHER_num(prio); i++)
513 {
514 if (sk_SSL_CIPHER_find(allow,
515 sk_SSL_CIPHER_value(prio,i)) >= 0)
516 break;
517 }
518
519 if (i >= sk_SSL_CIPHER_num(prio))
520 {
521 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
522 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
523 return(-1);
524 }
525 s->session->cipher=sk_SSL_CIPHER_value(prio,i);
526
527
528 if (s->session->peer != NULL) /* can't happen*/
529 {
530 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
531 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
532 return(-1);
533 }
534
535 s->session->peer = s->session->sess_cert->peer_key->x509;
536 /* peer_key->x509 has been set by ssl2_set_certificate. */
537 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
538 }
539
540 if (s->session->sess_cert == NULL ||
541 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
client_hello(SSL * s)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
client_master_key(SSL * s)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 > 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 (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 > 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
client_finished(SSL * s)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 */
client_certificate(SSL * s)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
get_server_verify(SSL * s)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
get_server_finished(SSL * s)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 */
ssl2_set_certificate(SSL * s,int type,int len,unsigned char * data)1040 int ssl2_set_certificate(SSL *s, int type, int len, 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 <= 0))
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
ssl_rsa_public_encrypt(SESS_CERT * sc,int len,unsigned char * from,unsigned char * to,int padding)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
1141