1 /* ssl/s2_clnt.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58 /* ====================================================================
59 * Copyright (c) 1998-2001 The OpenSSL Project. All rights reserved.
60 *
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
63 * are met:
64 *
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
67 *
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77 *
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
82 *
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
86 *
87 * 6. Redistributions of any form whatsoever must retain the following
88 * acknowledgment:
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91 *
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
105 *
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
109 *
110 */
111
112 #include "ssl_locl.h"
113 #ifndef OPENSSL_NO_SSL2
114 #include <stdio.h>
115 #include <openssl/rand.h>
116 #include <openssl/buffer.h>
117 #include <openssl/objects.h>
118 #include <openssl/evp.h>
119
120 static const SSL_METHOD *ssl2_get_client_method(int ver);
121 static int get_server_finished(SSL *s);
122 static int get_server_verify(SSL *s);
123 static int get_server_hello(SSL *s);
124 static int client_hello(SSL *s);
125 static int client_master_key(SSL *s);
126 static int client_finished(SSL *s);
127 static int client_certificate(SSL *s);
128 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
129 unsigned char *to,int padding);
130 #define BREAK break
131
132 static const SSL_METHOD *ssl2_get_client_method(int ver)
133 {
134 if (ver == SSL2_VERSION)
135 return(SSLv2_client_method());
136 else
137 return(NULL);
138 }
139
140 IMPLEMENT_ssl2_meth_func(SSLv2_client_method,
141 ssl_undefined_function,
142 ssl2_connect,
143 ssl2_get_client_method)
144
145 int ssl2_connect(SSL *s)
146 {
147 unsigned long l=(unsigned long)time(NULL);
148 BUF_MEM *buf=NULL;
149 int ret= -1;
150 void (*cb)(const SSL *ssl,int type,int val)=NULL;
151 int new_state,state;
152
153 RAND_add(&l,sizeof(l),0);
154 ERR_clear_error();
155 clear_sys_error();
156
157 if (s->info_callback != NULL)
158 cb=s->info_callback;
159 else if (s->ctx->info_callback != NULL)
160 cb=s->ctx->info_callback;
161
162 /* init things to blank */
163 s->in_handshake++;
164 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
165
166 for (;;)
167 {
168 state=s->state;
169
170 switch (s->state)
171 {
172 case SSL_ST_BEFORE:
173 case SSL_ST_CONNECT:
174 case SSL_ST_BEFORE|SSL_ST_CONNECT:
175 case SSL_ST_OK|SSL_ST_CONNECT:
176
177 s->server=0;
178 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
179
180 s->version=SSL2_VERSION;
181 s->type=SSL_ST_CONNECT;
182
183 buf=s->init_buf;
184 if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
185 {
186 ret= -1;
187 goto end;
188 }
189 if (!BUF_MEM_grow(buf,
190 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
191 {
192 if (buf == s->init_buf)
193 buf=NULL;
194 ret= -1;
195 goto end;
196 }
197 s->init_buf=buf;
198 buf=NULL;
199 s->init_num=0;
200 s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
201 s->ctx->stats.sess_connect++;
202 s->handshake_func=ssl2_connect;
203 BREAK;
204
205 case SSL2_ST_SEND_CLIENT_HELLO_A:
206 case SSL2_ST_SEND_CLIENT_HELLO_B:
207 s->shutdown=0;
208 ret=client_hello(s);
209 if (ret <= 0) goto end;
210 s->init_num=0;
211 s->state=SSL2_ST_GET_SERVER_HELLO_A;
212 BREAK;
213
214 case SSL2_ST_GET_SERVER_HELLO_A:
215 case SSL2_ST_GET_SERVER_HELLO_B:
216 ret=get_server_hello(s);
217 if (ret <= 0) goto end;
218 s->init_num=0;
219 if (!s->hit) /* new session */
220 {
221 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
222 BREAK;
223 }
224 else
225 {
226 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
227 break;
228 }
229
230 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
231 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
232 ret=client_master_key(s);
233 if (ret <= 0) goto end;
234 s->init_num=0;
235 s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
236 break;
237
238 case SSL2_ST_CLIENT_START_ENCRYPTION:
239 /* Ok, we now have all the stuff needed to
240 * start encrypting, so lets fire it up :-) */
241 if (!ssl2_enc_init(s,1))
242 {
243 ret= -1;
244 goto end;
245 }
246 s->s2->clear_text=0;
247 s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
248 break;
249
250 case SSL2_ST_SEND_CLIENT_FINISHED_A:
251 case SSL2_ST_SEND_CLIENT_FINISHED_B:
252 ret=client_finished(s);
253 if (ret <= 0) goto end;
254 s->init_num=0;
255 s->state=SSL2_ST_GET_SERVER_VERIFY_A;
256 break;
257
258 case SSL2_ST_GET_SERVER_VERIFY_A:
259 case SSL2_ST_GET_SERVER_VERIFY_B:
260 ret=get_server_verify(s);
261 if (ret <= 0) goto end;
262 s->init_num=0;
263 s->state=SSL2_ST_GET_SERVER_FINISHED_A;
264 break;
265
266 case SSL2_ST_GET_SERVER_FINISHED_A:
267 case SSL2_ST_GET_SERVER_FINISHED_B:
268 ret=get_server_finished(s);
269 if (ret <= 0) goto end;
270 break;
271
272 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
273 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
274 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
275 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
276 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
277 ret=client_certificate(s);
278 if (ret <= 0) goto end;
279 s->init_num=0;
280 s->state=SSL2_ST_GET_SERVER_FINISHED_A;
281 break;
282
283 case SSL_ST_OK:
284 if (s->init_buf != NULL)
285 {
286 BUF_MEM_free(s->init_buf);
287 s->init_buf=NULL;
288 }
289 s->init_num=0;
290 /* ERR_clear_error();*/
291
292 /* If we want to cache session-ids in the client
293 * and we successfully add the session-id to the
294 * cache, and there is a callback, then pass it out.
295 * 26/11/96 - eay - only add if not a re-used session.
296 */
297
298 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
299 if (s->hit) s->ctx->stats.sess_hit++;
300
301 ret=1;
302 /* s->server=0; */
303 s->ctx->stats.sess_connect_good++;
304
305 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
306
307 goto end;
308 /* break; */
309 default:
310 SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
311 return(-1);
312 /* break; */
313 }
314
315 if ((cb != NULL) && (s->state != state))
316 {
317 new_state=s->state;
318 s->state=state;
319 cb(s,SSL_CB_CONNECT_LOOP,1);
320 s->state=new_state;
321 }
322 }
323 end:
324 s->in_handshake--;
325 if (buf != NULL)
326 BUF_MEM_free(buf);
327 if (cb != NULL)
328 cb(s,SSL_CB_CONNECT_EXIT,ret);
329 return(ret);
330 }
331
332 static int get_server_hello(SSL *s)
333 {
334 unsigned char *buf;
335 unsigned char *p;
336 int i,j;
337 unsigned long len;
338 STACK_OF(SSL_CIPHER) *sk=NULL,*cl, *prio, *allow;
339
340 buf=(unsigned char *)s->init_buf->data;
341 p=buf;
342 if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
343 {
344 i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
345 if (i < (11-s->init_num))
346 return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
347 s->init_num = 11;
348
349 if (*(p++) != SSL2_MT_SERVER_HELLO)
350 {
351 if (p[-1] != SSL2_MT_ERROR)
352 {
353 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
354 SSLerr(SSL_F_GET_SERVER_HELLO,
355 SSL_R_READ_WRONG_PACKET_TYPE);
356 }
357 else
358 SSLerr(SSL_F_GET_SERVER_HELLO,
359 SSL_R_PEER_ERROR);
360 return(-1);
361 }
362 #if 0
363 s->hit=(*(p++))?1:0;
364 /* Some [PPC?] compilers fail to increment p in above
365 statement, e.g. one provided with Rhapsody 5.5, but
366 most recent example XL C 11.1 for AIX, even without
367 optimization flag... */
368 #else
369 s->hit=(*p)?1:0; p++;
370 #endif
371 s->s2->tmp.cert_type= *(p++);
372 n2s(p,i);
373 if (i < s->version) s->version=i;
374 n2s(p,i); s->s2->tmp.cert_length=i;
375 n2s(p,i); s->s2->tmp.csl=i;
376 n2s(p,i); s->s2->tmp.conn_id_length=i;
377 s->state=SSL2_ST_GET_SERVER_HELLO_B;
378 }
379
380 /* SSL2_ST_GET_SERVER_HELLO_B */
381 len = 11 + (unsigned long)s->s2->tmp.cert_length + (unsigned long)s->s2->tmp.csl + (unsigned long)s->s2->tmp.conn_id_length;
382 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
383 {
384 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_MESSAGE_TOO_LONG);
385 return -1;
386 }
387 j = (int)len - s->init_num;
388 i = ssl2_read(s,(char *)&(buf[s->init_num]),j);
389 if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
390 if (s->msg_callback)
391 s->msg_callback(0, s->version, 0, buf, (size_t)len, s, s->msg_callback_arg); /* SERVER-HELLO */
392
393 /* things are looking good */
394
395 p = buf + 11;
396 if (s->hit)
397 {
398 if (s->s2->tmp.cert_length != 0)
399 {
400 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
401 return(-1);
402 }
403 if (s->s2->tmp.cert_type != 0)
404 {
405 if (!(s->options &
406 SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
407 {
408 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
409 return(-1);
410 }
411 }
412 if (s->s2->tmp.csl != 0)
413 {
414 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
415 return(-1);
416 }
417 }
418 else
419 {
420 #ifdef undef
421 /* very bad */
422 memset(s->session->session_id,0,
423 SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
424 s->session->session_id_length=0;
425 */
426 #endif
427
428 /* we need to do this in case we were trying to reuse a
429 * client session but others are already reusing it.
430 * If this was a new 'blank' session ID, the session-id
431 * length will still be 0 */
432 if (s->session->session_id_length > 0)
433 {
434 if (!ssl_get_new_session(s,0))
435 {
436 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
437 return(-1);
438 }
439 }
440
441 if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
442 s->s2->tmp.cert_length,p) <= 0)
443 {
444 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
445 return(-1);
446 }
447 p+=s->s2->tmp.cert_length;
448
449 if (s->s2->tmp.csl == 0)
450 {
451 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
452 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
453 return(-1);
454 }
455
456 /* We have just received a list of ciphers back from the
457 * server. We need to get the ones that match, then select
458 * the one we want the most :-). */
459
460 /* load the ciphers */
461 sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
462 &s->session->ciphers);
463 p+=s->s2->tmp.csl;
464 if (sk == NULL)
465 {
466 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
467 SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
468 return(-1);
469 }
470
471 (void)sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
472
473 /* get the array of ciphers we will accept */
474 cl=SSL_get_ciphers(s);
475 (void)sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp);
476
477 /*
478 * If server preference flag set, choose the first
479 * (highest priority) cipher the server sends, otherwise
480 * client preference has priority.
481 */
482 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
483 {
484 prio = sk;
485 allow = cl;
486 }
487 else
488 {
489 prio = cl;
490 allow = sk;
491 }
492 /* In theory we could have ciphers sent back that we
493 * don't want to use but that does not matter since we
494 * will check against the list we originally sent and
495 * for performance reasons we should not bother to match
496 * the two lists up just to check. */
497 for (i=0; i<sk_SSL_CIPHER_num(prio); i++)
498 {
499 if (sk_SSL_CIPHER_find(allow,
500 sk_SSL_CIPHER_value(prio,i)) >= 0)
501 break;
502 }
503
504 if (i >= sk_SSL_CIPHER_num(prio))
505 {
506 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
507 SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
508 return(-1);
509 }
510 s->session->cipher=sk_SSL_CIPHER_value(prio,i);
511
512
513 if (s->session->peer != NULL) /* can't happen*/
514 {
515 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
516 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
517 return(-1);
518 }
519
520 s->session->peer = s->session->sess_cert->peer_key->x509;
521 /* peer_key->x509 has been set by ssl2_set_certificate. */
522 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
523 }
524
525 if (s->session->sess_cert == NULL
526 || s->session->peer != s->session->sess_cert->peer_key->x509)
527 /* can't happen */
528 {
529 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
530 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
531 return(-1);
532 }
533
534 s->s2->conn_id_length=s->s2->tmp.conn_id_length;
535 if (s->s2->conn_id_length > sizeof s->s2->conn_id)
536 {
537 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
538 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_SSL2_CONNECTION_ID_TOO_LONG);
539 return -1;
540 }
541 memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
542 return(1);
543 }
544
545 static int client_hello(SSL *s)
546 {
547 unsigned char *buf;
548 unsigned char *p,*d;
549 /* CIPHER **cipher;*/
550 int i,n,j;
551
552 buf=(unsigned char *)s->init_buf->data;
553 if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
554 {
555 if ((s->session == NULL) ||
556 (s->session->ssl_version != s->version))
557 {
558 if (!ssl_get_new_session(s,0))
559 {
560 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
561 return(-1);
562 }
563 }
564 /* else use the pre-loaded session */
565
566 p=buf; /* header */
567 d=p+9; /* data section */
568 *(p++)=SSL2_MT_CLIENT_HELLO; /* type */
569 s2n(SSL2_VERSION,p); /* version */
570 n=j=0;
571
572 n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d,0);
573 d+=n;
574
575 if (n == 0)
576 {
577 SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
578 return(-1);
579 }
580
581 s2n(n,p); /* cipher spec num bytes */
582
583 if ((s->session->session_id_length > 0) &&
584 (s->session->session_id_length <=
585 SSL2_MAX_SSL_SESSION_ID_LENGTH))
586 {
587 i=s->session->session_id_length;
588 s2n(i,p); /* session id length */
589 memcpy(d,s->session->session_id,(unsigned int)i);
590 d+=i;
591 }
592 else
593 {
594 s2n(0,p);
595 }
596
597 s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
598 s2n(SSL2_CHALLENGE_LENGTH,p); /* challenge length */
599 /*challenge id data*/
600 if (RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH) <= 0)
601 return -1;
602 memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
603 d+=SSL2_CHALLENGE_LENGTH;
604
605 s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
606 s->init_num=d-buf;
607 s->init_off=0;
608 }
609 /* SSL2_ST_SEND_CLIENT_HELLO_B */
610 return(ssl2_do_write(s));
611 }
612
613 static int client_master_key(SSL *s)
614 {
615 unsigned char *buf;
616 unsigned char *p,*d;
617 int clear,enc,karg,i;
618 SSL_SESSION *sess;
619 const EVP_CIPHER *c;
620 const EVP_MD *md;
621
622 buf=(unsigned char *)s->init_buf->data;
623 if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
624 {
625
626 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL))
627 {
628 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
629 SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
630 return(-1);
631 }
632 sess=s->session;
633 p=buf;
634 d=p+10;
635 *(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
636
637 i=ssl_put_cipher_by_char(s,sess->cipher,p);
638 p+=i;
639
640 /* make key_arg data */
641 i=EVP_CIPHER_iv_length(c);
642 sess->key_arg_length=i;
643 if (i > SSL_MAX_KEY_ARG_LENGTH)
644 {
645 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
646 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
647 return -1;
648 }
649 if (i > 0)
650 if (RAND_pseudo_bytes(sess->key_arg,i) <= 0)
651 return -1;
652
653 /* make a master key */
654 i=EVP_CIPHER_key_length(c);
655 sess->master_key_length=i;
656 if (i > 0)
657 {
658 if (i > (int)sizeof(sess->master_key))
659 {
660 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
661 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
662 return -1;
663 }
664 if (RAND_bytes(sess->master_key,i) <= 0)
665 {
666 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
667 return(-1);
668 }
669 }
670
671 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
672 enc=8;
673 else if (SSL_C_IS_EXPORT(sess->cipher))
674 enc=5;
675 else
676 enc=i;
677
678 if ((int)i < enc)
679 {
680 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
681 SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
682 return(-1);
683 }
684 clear=i-enc;
685 s2n(clear,p);
686 memcpy(d,sess->master_key,(unsigned int)clear);
687 d+=clear;
688
689 enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
690 &(sess->master_key[clear]),d,
691 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
692 if (enc <= 0)
693 {
694 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
695 SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
696 return(-1);
697 }
698 #ifdef PKCS1_CHECK
699 if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
700 if (s->options & SSL_OP_PKCS1_CHECK_2)
701 sess->master_key[clear]++;
702 #endif
703 s2n(enc,p);
704 d+=enc;
705 karg=sess->key_arg_length;
706 s2n(karg,p); /* key arg size */
707 if (karg > (int)sizeof(sess->key_arg))
708 {
709 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
710 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
711 return -1;
712 }
713 memcpy(d,sess->key_arg,(unsigned int)karg);
714 d+=karg;
715
716 s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
717 s->init_num=d-buf;
718 s->init_off=0;
719 }
720
721 /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
722 return(ssl2_do_write(s));
723 }
724
725 static int client_finished(SSL *s)
726 {
727 unsigned char *p;
728
729 if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
730 {
731 p=(unsigned char *)s->init_buf->data;
732 *(p++)=SSL2_MT_CLIENT_FINISHED;
733 if (s->s2->conn_id_length > sizeof s->s2->conn_id)
734 {
735 SSLerr(SSL_F_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
736 return -1;
737 }
738 memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
739
740 s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
741 s->init_num=s->s2->conn_id_length+1;
742 s->init_off=0;
743 }
744 return(ssl2_do_write(s));
745 }
746
747 /* read the data and then respond */
748 static int client_certificate(SSL *s)
749 {
750 unsigned char *buf;
751 unsigned char *p,*d;
752 int i;
753 unsigned int n;
754 int cert_ch_len;
755 unsigned char *cert_ch;
756
757 buf=(unsigned char *)s->init_buf->data;
758
759 /* We have a cert associated with the SSL, so attach it to
760 * the session if it does not have one */
761
762 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
763 {
764 i=ssl2_read(s,(char *)&(buf[s->init_num]),
765 SSL2_MAX_CERT_CHALLENGE_LENGTH+2-s->init_num);
766 if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+2-s->init_num))
767 return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
768 s->init_num += i;
769 if (s->msg_callback)
770 s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* REQUEST-CERTIFICATE */
771
772 /* type=buf[0]; */
773 /* type eq x509 */
774 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
775 {
776 ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
777 SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
778 return(-1);
779 }
780
781 if ((s->cert == NULL) ||
782 (s->cert->key->x509 == NULL) ||
783 (s->cert->key->privatekey == NULL))
784 {
785 s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
786 }
787 else
788 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
789 }
790
791 cert_ch = buf + 2;
792 cert_ch_len = s->init_num - 2;
793
794 if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
795 {
796 X509 *x509=NULL;
797 EVP_PKEY *pkey=NULL;
798
799 /* If we get an error we need to
800 * ssl->rwstate=SSL_X509_LOOKUP;
801 * return(error);
802 * We should then be retried when things are ok and we
803 * can get a cert or not */
804
805 i=0;
806 if (s->ctx->client_cert_cb != NULL)
807 {
808 i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
809 }
810
811 if (i < 0)
812 {
813 s->rwstate=SSL_X509_LOOKUP;
814 return(-1);
815 }
816 s->rwstate=SSL_NOTHING;
817
818 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
819 {
820 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
821 if ( !SSL_use_certificate(s,x509) ||
822 !SSL_use_PrivateKey(s,pkey))
823 {
824 i=0;
825 }
826 X509_free(x509);
827 EVP_PKEY_free(pkey);
828 }
829 else if (i == 1)
830 {
831 if (x509 != NULL) X509_free(x509);
832 if (pkey != NULL) EVP_PKEY_free(pkey);
833 SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
834 i=0;
835 }
836
837 if (i == 0)
838 {
839 /* We have no client certificate to respond with
840 * so send the correct error message back */
841 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
842 p=buf;
843 *(p++)=SSL2_MT_ERROR;
844 s2n(SSL2_PE_NO_CERTIFICATE,p);
845 s->init_off=0;
846 s->init_num=3;
847 /* Write is done at the end */
848 }
849 }
850
851 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
852 {
853 return(ssl2_do_write(s));
854 }
855
856 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
857 {
858 EVP_MD_CTX ctx;
859
860 /* ok, now we calculate the checksum
861 * do it first so we can reuse buf :-) */
862 p=buf;
863 EVP_MD_CTX_init(&ctx);
864 EVP_SignInit_ex(&ctx,s->ctx->rsa_md5, NULL);
865 EVP_SignUpdate(&ctx,s->s2->key_material,
866 s->s2->key_material_length);
867 EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
868 i=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
869 /* Don't update the signature if it fails - FIXME: probably should handle this better */
870 if(i > 0)
871 EVP_SignUpdate(&ctx,buf,(unsigned int)i);
872
873 p=buf;
874 d=p+6;
875 *(p++)=SSL2_MT_CLIENT_CERTIFICATE;
876 *(p++)=SSL2_CT_X509_CERTIFICATE;
877 n=i2d_X509(s->cert->key->x509,&d);
878 s2n(n,p);
879
880 if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
881 {
882 /* this is not good. If things have failed it
883 * means there so something wrong with the key.
884 * We will continue with a 0 length signature
885 */
886 }
887 EVP_MD_CTX_cleanup(&ctx);
888 s2n(n,p);
889 d+=n;
890
891 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
892 s->init_num=d-buf;
893 s->init_off=0;
894 }
895 /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
896 return(ssl2_do_write(s));
897 }
898
899 static int get_server_verify(SSL *s)
900 {
901 unsigned char *p;
902 int i, n, len;
903
904 p=(unsigned char *)s->init_buf->data;
905 if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
906 {
907 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
908 if (i < (1-s->init_num))
909 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
910 s->init_num += i;
911
912 s->state= SSL2_ST_GET_SERVER_VERIFY_B;
913 if (*p != SSL2_MT_SERVER_VERIFY)
914 {
915 if (p[0] != SSL2_MT_ERROR)
916 {
917 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
918 SSLerr(SSL_F_GET_SERVER_VERIFY,
919 SSL_R_READ_WRONG_PACKET_TYPE);
920 }
921 else
922 {
923 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_PEER_ERROR);
924 /* try to read the error message */
925 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
926 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
927 }
928 return(-1);
929 }
930 }
931
932 p=(unsigned char *)s->init_buf->data;
933 len = 1 + s->s2->challenge_length;
934 n = len - s->init_num;
935 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
936 if (i < n)
937 return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
938 if (s->msg_callback)
939 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* SERVER-VERIFY */
940 p += 1;
941
942 if (CRYPTO_memcmp(p,s->s2->challenge,s->s2->challenge_length) != 0)
943 {
944 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
945 SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
946 return(-1);
947 }
948 return(1);
949 }
950
951 static int get_server_finished(SSL *s)
952 {
953 unsigned char *buf;
954 unsigned char *p;
955 int i, n, len;
956
957 buf=(unsigned char *)s->init_buf->data;
958 p=buf;
959 if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
960 {
961 i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
962 if (i < (1-s->init_num))
963 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
964 s->init_num += i;
965
966 if (*p == SSL2_MT_REQUEST_CERTIFICATE)
967 {
968 s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
969 return(1);
970 }
971 else if (*p != SSL2_MT_SERVER_FINISHED)
972 {
973 if (p[0] != SSL2_MT_ERROR)
974 {
975 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
976 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
977 }
978 else
979 {
980 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
981 /* try to read the error message */
982 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
983 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
984 }
985 return(-1);
986 }
987 s->state=SSL2_ST_GET_SERVER_FINISHED_B;
988 }
989
990 len = 1 + SSL2_SSL_SESSION_ID_LENGTH;
991 n = len - s->init_num;
992 i = ssl2_read(s,(char *)&(buf[s->init_num]), n);
993 if (i < n) /* XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, that's the maximum */
994 return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
995 s->init_num += i;
996 if (s->msg_callback)
997 s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* SERVER-FINISHED */
998
999 if (!s->hit) /* new session */
1000 {
1001 /* new session-id */
1002 /* Make sure we were not trying to re-use an old SSL_SESSION
1003 * or bad things can happen */
1004 /* ZZZZZZZZZZZZZ */
1005 s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
1006 memcpy(s->session->session_id,p+1,SSL2_SSL_SESSION_ID_LENGTH);
1007 }
1008 else
1009 {
1010 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
1011 {
1012 if ((s->session->session_id_length > sizeof s->session->session_id)
1013 || (0 != memcmp(buf + 1, s->session->session_id,
1014 (unsigned int)s->session->session_id_length)))
1015 {
1016 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
1017 SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
1018 return(-1);
1019 }
1020 }
1021 }
1022 s->state = SSL_ST_OK;
1023 return(1);
1024 }
1025
1026 /* loads in the certificate from the server */
1027 int ssl2_set_certificate(SSL *s, int type, int len, const unsigned char *data)
1028 {
1029 STACK_OF(X509) *sk=NULL;
1030 EVP_PKEY *pkey=NULL;
1031 SESS_CERT *sc=NULL;
1032 int i;
1033 X509 *x509=NULL;
1034 int ret=0;
1035
1036 x509=d2i_X509(NULL,&data,(long)len);
1037 if (x509 == NULL)
1038 {
1039 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
1040 goto err;
1041 }
1042
1043 if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
1044 {
1045 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1046 goto err;
1047 }
1048
1049 i=ssl_verify_cert_chain(s,sk);
1050
1051 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0))
1052 {
1053 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1054 goto err;
1055 }
1056 ERR_clear_error(); /* but we keep s->verify_result */
1057 s->session->verify_result = s->verify_result;
1058
1059 /* server's cert for this session */
1060 sc=ssl_sess_cert_new();
1061 if (sc == NULL)
1062 {
1063 ret= -1;
1064 goto err;
1065 }
1066 if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1067 s->session->sess_cert=sc;
1068
1069 sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
1070 sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
1071
1072 pkey=X509_get_pubkey(x509);
1073 x509=NULL;
1074 if (pkey == NULL)
1075 {
1076 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
1077 goto err;
1078 }
1079 if (pkey->type != EVP_PKEY_RSA)
1080 {
1081 SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
1082 goto err;
1083 }
1084
1085 if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
1086 goto err;
1087 ret=1;
1088 err:
1089 sk_X509_free(sk);
1090 X509_free(x509);
1091 EVP_PKEY_free(pkey);
1092 return(ret);
1093 }
1094
1095 static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
1096 unsigned char *to, int padding)
1097 {
1098 EVP_PKEY *pkey=NULL;
1099 int i= -1;
1100
1101 if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
1102 ((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
1103 {
1104 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
1105 return(-1);
1106 }
1107 if (pkey->type != EVP_PKEY_RSA)
1108 {
1109 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1110 goto end;
1111 }
1112
1113 /* we have the public key */
1114 i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
1115 if (i < 0)
1116 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
1117 end:
1118 EVP_PKEY_free(pkey);
1119 return(i);
1120 }
1121 #else /* !OPENSSL_NO_SSL2 */
1122
1123 # if PEDANTIC
1124 static void *dummy=&dummy;
1125 # endif
1126
1127 #endif