1 /* ssl/s2_srvr.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/bio.h>
116 #include <openssl/rand.h>
117 #include <openssl/objects.h>
118 #include <openssl/evp.h>
119
120 static const SSL_METHOD *ssl2_get_server_method(int ver);
121 static int get_client_master_key(SSL *s);
122 static int get_client_hello(SSL *s);
123 static int server_hello(SSL *s);
124 static int get_client_finished(SSL *s);
125 static int server_verify(SSL *s);
126 static int server_finish(SSL *s);
127 static int request_certificate(SSL *s);
128 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
129 unsigned char *to,int padding);
130 #define BREAK break
131
132 static const SSL_METHOD *ssl2_get_server_method(int ver)
133 {
134 if (ver == SSL2_VERSION)
135 return(SSLv2_server_method());
136 else
137 return(NULL);
138 }
139
140 IMPLEMENT_ssl2_meth_func(SSLv2_server_method,
141 ssl2_accept,
142 ssl_undefined_function,
143 ssl2_get_server_method)
144
145 int ssl2_accept(SSL *s)
146 {
147 unsigned long l=(unsigned long)time(NULL);
148 BUF_MEM *buf=NULL;
149 int ret= -1;
150 long num1;
151 void (*cb)(const SSL *ssl,int type,int val)=NULL;
152 int new_state,state;
153
154 RAND_add(&l,sizeof(l),0);
155 ERR_clear_error();
156 clear_sys_error();
157
158 if (s->info_callback != NULL)
159 cb=s->info_callback;
160 else if (s->ctx->info_callback != NULL)
161 cb=s->ctx->info_callback;
162
163 /* init things to blank */
164 s->in_handshake++;
165 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
166
167 if (s->cert == NULL)
168 {
169 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
170 return(-1);
171 }
172
173 clear_sys_error();
174 for (;;)
175 {
176 state=s->state;
177
178 switch (s->state)
179 {
180 case SSL_ST_BEFORE:
181 case SSL_ST_ACCEPT:
182 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
183 case SSL_ST_OK|SSL_ST_ACCEPT:
184
185 s->server=1;
186 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
187
188 s->version=SSL2_VERSION;
189 s->type=SSL_ST_ACCEPT;
190
191 buf=s->init_buf;
192 if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
193 { ret= -1; goto end; }
194 if (!BUF_MEM_grow(buf,(int)
195 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
196 { ret= -1; goto end; }
197 s->init_buf=buf;
198 s->init_num=0;
199 s->ctx->stats.sess_accept++;
200 s->handshake_func=ssl2_accept;
201 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
202 BREAK;
203
204 case SSL2_ST_GET_CLIENT_HELLO_A:
205 case SSL2_ST_GET_CLIENT_HELLO_B:
206 case SSL2_ST_GET_CLIENT_HELLO_C:
207 s->shutdown=0;
208 ret=get_client_hello(s);
209 if (ret <= 0) goto end;
210 s->init_num=0;
211 s->state=SSL2_ST_SEND_SERVER_HELLO_A;
212 BREAK;
213
214 case SSL2_ST_SEND_SERVER_HELLO_A:
215 case SSL2_ST_SEND_SERVER_HELLO_B:
216 ret=server_hello(s);
217 if (ret <= 0) goto end;
218 s->init_num=0;
219 if (!s->hit)
220 {
221 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
222 BREAK;
223 }
224 else
225 {
226 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
227 BREAK;
228 }
229 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
230 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
231 ret=get_client_master_key(s);
232 if (ret <= 0) goto end;
233 s->init_num=0;
234 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
235 BREAK;
236
237 case SSL2_ST_SERVER_START_ENCRYPTION:
238 /* Ok we how have sent all the stuff needed to
239 * start encrypting, the next packet back will
240 * be encrypted. */
241 if (!ssl2_enc_init(s,0))
242 { ret= -1; goto end; }
243 s->s2->clear_text=0;
244 s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
245 BREAK;
246
247 case SSL2_ST_SEND_SERVER_VERIFY_A:
248 case SSL2_ST_SEND_SERVER_VERIFY_B:
249 ret=server_verify(s);
250 if (ret <= 0) goto end;
251 s->init_num=0;
252 if (s->hit)
253 {
254 /* If we are in here, we have been
255 * buffering the output, so we need to
256 * flush it and remove buffering from
257 * future traffic */
258 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
259 BREAK;
260 }
261 else
262 {
263 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
264 break;
265 }
266
267 case SSL2_ST_SEND_SERVER_VERIFY_C:
268 /* get the number of bytes to write */
269 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
270 if (num1 > 0)
271 {
272 s->rwstate=SSL_WRITING;
273 num1=BIO_flush(s->wbio);
274 if (num1 <= 0) { ret= -1; goto end; }
275 s->rwstate=SSL_NOTHING;
276 }
277
278 /* flushed and now remove buffering */
279 s->wbio=BIO_pop(s->wbio);
280
281 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
282 BREAK;
283
284 case SSL2_ST_GET_CLIENT_FINISHED_A:
285 case SSL2_ST_GET_CLIENT_FINISHED_B:
286 ret=get_client_finished(s);
287 if (ret <= 0)
288 goto end;
289 s->init_num=0;
290 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
291 BREAK;
292
293 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
294 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
295 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
296 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
297 /* don't do a 'request certificate' if we
298 * don't want to, or we already have one, and
299 * we only want to do it once. */
300 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
301 ((s->session->peer != NULL) &&
302 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
303 {
304 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
305 break;
306 }
307 else
308 {
309 ret=request_certificate(s);
310 if (ret <= 0) goto end;
311 s->init_num=0;
312 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
313 }
314 BREAK;
315
316 case SSL2_ST_SEND_SERVER_FINISHED_A:
317 case SSL2_ST_SEND_SERVER_FINISHED_B:
318 ret=server_finish(s);
319 if (ret <= 0) goto end;
320 s->init_num=0;
321 s->state=SSL_ST_OK;
322 break;
323
324 case SSL_ST_OK:
325 BUF_MEM_free(s->init_buf);
326 ssl_free_wbio_buffer(s);
327 s->init_buf=NULL;
328 s->init_num=0;
329 /* ERR_clear_error();*/
330
331 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
332
333 s->ctx->stats.sess_accept_good++;
334 /* s->server=1; */
335 ret=1;
336
337 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
338
339 goto end;
340 /* BREAK; */
341
342 default:
343 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
344 ret= -1;
345 goto end;
346 /* BREAK; */
347 }
348
349 if ((cb != NULL) && (s->state != state))
350 {
351 new_state=s->state;
352 s->state=state;
353 cb(s,SSL_CB_ACCEPT_LOOP,1);
354 s->state=new_state;
355 }
356 }
357 end:
358 s->in_handshake--;
359 if (cb != NULL)
360 cb(s,SSL_CB_ACCEPT_EXIT,ret);
361 return(ret);
362 }
363
364 static int get_client_master_key(SSL *s)
365 {
366 int is_export,i,n,keya,ek;
367 unsigned long len;
368 unsigned char *p;
369 const SSL_CIPHER *cp;
370 const EVP_CIPHER *c;
371 const EVP_MD *md;
372
373 p=(unsigned char *)s->init_buf->data;
374 if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
375 {
376 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
377
378 if (i < (10-s->init_num))
379 return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
380 s->init_num = 10;
381
382 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
383 {
384 if (p[-1] != SSL2_MT_ERROR)
385 {
386 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
387 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
388 }
389 else
390 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
391 return(-1);
392 }
393
394 cp=ssl2_get_cipher_by_char(p);
395 if (cp == NULL)
396 {
397 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
398 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
399 return(-1);
400 }
401 s->session->cipher= cp;
402
403 p+=3;
404 n2s(p,i); s->s2->tmp.clear=i;
405 n2s(p,i); s->s2->tmp.enc=i;
406 n2s(p,i);
407 if(i > SSL_MAX_KEY_ARG_LENGTH)
408 {
409 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
410 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
411 return -1;
412 }
413 s->session->key_arg_length=i;
414 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
415 }
416
417 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
418 p=(unsigned char *)s->init_buf->data;
419 if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
420 {
421 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
422 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
423 return -1;
424 }
425 keya=s->session->key_arg_length;
426 len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya;
427 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
428 {
429 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
430 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);
431 return -1;
432 }
433 n = (int)len - s->init_num;
434 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
435 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
436 if (s->msg_callback)
437 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */
438 p += 10;
439
440 memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
441 (unsigned int)keya);
442
443 if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
444 {
445 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
446 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
447 return(-1);
448 }
449 i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
450 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
451 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
452
453 is_export=SSL_C_IS_EXPORT(s->session->cipher);
454
455 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL))
456 {
457 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
458 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
459 return(0);
460 }
461
462 if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
463 {
464 is_export=1;
465 ek=8;
466 }
467 else
468 ek=5;
469
470 /* bad decrypt */
471 #if 1
472 /* If a bad decrypt, continue with protocol but with a
473 * random master secret (Bleichenbacher attack) */
474 if ((i < 0) ||
475 ((!is_export && (i != EVP_CIPHER_key_length(c)))
476 || (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i !=
477 (unsigned int)EVP_CIPHER_key_length(c))))))
478 {
479 ERR_clear_error();
480 if (is_export)
481 i=ek;
482 else
483 i=EVP_CIPHER_key_length(c);
484 if (RAND_pseudo_bytes(p,i) <= 0)
485 return 0;
486 }
487 #else
488 if (i < 0)
489 {
490 error=1;
491 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
492 }
493 /* incorrect number of key bytes for non export cipher */
494 else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
495 || (is_export && ((i != ek) || (s->s2->tmp.clear+i !=
496 EVP_CIPHER_key_length(c)))))
497 {
498 error=1;
499 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
500 }
501 if (error)
502 {
503 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
504 return(-1);
505 }
506 #endif
507
508 if (is_export) i+=s->s2->tmp.clear;
509
510 if (i > SSL_MAX_MASTER_KEY_LENGTH)
511 {
512 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
513 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
514 return -1;
515 }
516 s->session->master_key_length=i;
517 memcpy(s->session->master_key,p,(unsigned int)i);
518 return(1);
519 }
520
521 static int get_client_hello(SSL *s)
522 {
523 int i,n;
524 unsigned long len;
525 unsigned char *p;
526 STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
527 STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
528 STACK_OF(SSL_CIPHER) *prio, *allow;
529 int z;
530
531 /* This is a bit of a hack to check for the correct packet
532 * type the first time round. */
533 if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
534 {
535 s->first_packet=1;
536 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
537 }
538
539 p=(unsigned char *)s->init_buf->data;
540 if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
541 {
542 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
543 if (i < (9-s->init_num))
544 return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
545 s->init_num = 9;
546
547 if (*(p++) != SSL2_MT_CLIENT_HELLO)
548 {
549 if (p[-1] != SSL2_MT_ERROR)
550 {
551 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
552 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
553 }
554 else
555 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
556 return(-1);
557 }
558 n2s(p,i);
559 if (i < s->version) s->version=i;
560 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
561 n2s(p,i); s->s2->tmp.session_id_length=i;
562 n2s(p,i); s->s2->challenge_length=i;
563 if ( (i < SSL2_MIN_CHALLENGE_LENGTH) ||
564 (i > SSL2_MAX_CHALLENGE_LENGTH))
565 {
566 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
567 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
568 return(-1);
569 }
570 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
571 }
572
573 /* SSL2_ST_GET_CLIENT_HELLO_C */
574 p=(unsigned char *)s->init_buf->data;
575 len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;
576 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
577 {
578 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
579 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);
580 return -1;
581 }
582 n = (int)len - s->init_num;
583 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
584 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
585 if (s->msg_callback)
586 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */
587 p += 9;
588
589 /* get session-id before cipher stuff so we can get out session
590 * structure if it is cached */
591 /* session-id */
592 if ((s->s2->tmp.session_id_length != 0) &&
593 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
594 {
595 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
596 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
597 return(-1);
598 }
599
600 if (s->s2->tmp.session_id_length == 0)
601 {
602 if (!ssl_get_new_session(s,1))
603 {
604 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
605 return(-1);
606 }
607 }
608 else
609 {
610 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
611 s->s2->tmp.session_id_length, NULL);
612 if (i == 1)
613 { /* previous session */
614 s->hit=1;
615 }
616 else if (i == -1)
617 {
618 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
619 return(-1);
620 }
621 else
622 {
623 if (s->cert == NULL)
624 {
625 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
626 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
627 return(-1);
628 }
629
630 if (!ssl_get_new_session(s,1))
631 {
632 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
633 return(-1);
634 }
635 }
636 }
637
638 if (!s->hit)
639 {
640 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
641 &s->session->ciphers);
642 if (cs == NULL) goto mem_err;
643
644 cl=SSL_get_ciphers(s);
645
646 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
647 {
648 prio=sk_SSL_CIPHER_dup(cl);
649 if (prio == NULL) goto mem_err;
650 allow = cs;
651 }
652 else
653 {
654 prio = cs;
655 allow = cl;
656 }
657 for (z=0; z<sk_SSL_CIPHER_num(prio); z++)
658 {
659 if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0)
660 {
661 (void)sk_SSL_CIPHER_delete(prio,z);
662 z--;
663 }
664 }
665 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
666 {
667 sk_SSL_CIPHER_free(s->session->ciphers);
668 s->session->ciphers = prio;
669 }
670 /* s->session->ciphers should now have a list of
671 * ciphers that are on both the client and server.
672 * This list is ordered by the order the client sent
673 * the ciphers or in the order of the server's preference
674 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
675 */
676 }
677 p+=s->s2->tmp.cipher_spec_length;
678 /* done cipher selection */
679
680 /* session id extracted already */
681 p+=s->s2->tmp.session_id_length;
682
683 /* challenge */
684 if (s->s2->challenge_length > sizeof s->s2->challenge)
685 {
686 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
687 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
688 return -1;
689 }
690 memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
691 return(1);
692 mem_err:
693 SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
694 return(0);
695 }
696
697 static int server_hello(SSL *s)
698 {
699 unsigned char *p,*d;
700 int n,hit;
701
702 p=(unsigned char *)s->init_buf->data;
703 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
704 {
705 d=p+11;
706 *(p++)=SSL2_MT_SERVER_HELLO; /* type */
707 hit=s->hit;
708 *(p++)=(unsigned char)hit;
709 #if 1
710 if (!hit)
711 {
712 if (s->session->sess_cert != NULL)
713 /* This can't really happen because get_client_hello
714 * has called ssl_get_new_session, which does not set
715 * sess_cert. */
716 ssl_sess_cert_free(s->session->sess_cert);
717 s->session->sess_cert = ssl_sess_cert_new();
718 if (s->session->sess_cert == NULL)
719 {
720 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
721 return(-1);
722 }
723 }
724 /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
725 * depending on whether it survived in the internal cache
726 * or was retrieved from an external cache.
727 * If it is NULL, we cannot put any useful data in it anyway,
728 * so we don't touch it.
729 */
730
731 #else /* That's what used to be done when cert_st and sess_cert_st were
732 * the same. */
733 if (!hit)
734 { /* else add cert to session */
735 CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
736 if (s->session->sess_cert != NULL)
737 ssl_cert_free(s->session->sess_cert);
738 s->session->sess_cert=s->cert;
739 }
740 else /* We have a session id-cache hit, if the
741 * session-id has no certificate listed against
742 * the 'cert' structure, grab the 'old' one
743 * listed against the SSL connection */
744 {
745 if (s->session->sess_cert == NULL)
746 {
747 CRYPTO_add(&s->cert->references,1,
748 CRYPTO_LOCK_SSL_CERT);
749 s->session->sess_cert=s->cert;
750 }
751 }
752 #endif
753
754 if (s->cert == NULL)
755 {
756 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
757 SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
758 return(-1);
759 }
760
761 if (hit)
762 {
763 *(p++)=0; /* no certificate type */
764 s2n(s->version,p); /* version */
765 s2n(0,p); /* cert len */
766 s2n(0,p); /* ciphers len */
767 }
768 else
769 {
770 /* EAY EAY */
771 /* put certificate type */
772 *(p++)=SSL2_CT_X509_CERTIFICATE;
773 s2n(s->version,p); /* version */
774 n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
775 s2n(n,p); /* certificate length */
776 i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
777 n=0;
778
779 /* lets send out the ciphers we like in the
780 * prefered order */
781 n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);
782 d+=n;
783 s2n(n,p); /* add cipher length */
784 }
785
786 /* make and send conn_id */
787 s2n(SSL2_CONNECTION_ID_LENGTH,p); /* add conn_id length */
788 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
789 if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)
790 return -1;
791 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
792 d+=SSL2_CONNECTION_ID_LENGTH;
793
794 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
795 s->init_num=d-(unsigned char *)s->init_buf->data;
796 s->init_off=0;
797 }
798 /* SSL2_ST_SEND_SERVER_HELLO_B */
799 /* If we are using TCP/IP, the performance is bad if we do 2
800 * writes without a read between them. This occurs when
801 * Session-id reuse is used, so I will put in a buffering module
802 */
803 if (s->hit)
804 {
805 if (!ssl_init_wbio_buffer(s,1)) return(-1);
806 }
807
808 return(ssl2_do_write(s));
809 }
810
811 static int get_client_finished(SSL *s)
812 {
813 unsigned char *p;
814 int i, n;
815 unsigned long len;
816
817 p=(unsigned char *)s->init_buf->data;
818 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
819 {
820 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
821 if (i < 1-s->init_num)
822 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
823 s->init_num += i;
824
825 if (*p != SSL2_MT_CLIENT_FINISHED)
826 {
827 if (*p != SSL2_MT_ERROR)
828 {
829 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
830 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
831 }
832 else
833 {
834 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
835 /* try to read the error message */
836 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
837 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
838 }
839 return(-1);
840 }
841 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
842 }
843
844 /* SSL2_ST_GET_CLIENT_FINISHED_B */
845 if (s->s2->conn_id_length > sizeof s->s2->conn_id)
846 {
847 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
848 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
849 return -1;
850 }
851 len = 1 + (unsigned long)s->s2->conn_id_length;
852 n = (int)len - s->init_num;
853 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
854 if (i < n)
855 {
856 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
857 }
858 if (s->msg_callback)
859 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */
860 p += 1;
861 if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)
862 {
863 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
864 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
865 return(-1);
866 }
867 return(1);
868 }
869
870 static int server_verify(SSL *s)
871 {
872 unsigned char *p;
873
874 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
875 {
876 p=(unsigned char *)s->init_buf->data;
877 *(p++)=SSL2_MT_SERVER_VERIFY;
878 if (s->s2->challenge_length > sizeof s->s2->challenge)
879 {
880 SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
881 return -1;
882 }
883 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
884 /* p+=s->s2->challenge_length; */
885
886 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
887 s->init_num=s->s2->challenge_length+1;
888 s->init_off=0;
889 }
890 return(ssl2_do_write(s));
891 }
892
893 static int server_finish(SSL *s)
894 {
895 unsigned char *p;
896
897 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
898 {
899 p=(unsigned char *)s->init_buf->data;
900 *(p++)=SSL2_MT_SERVER_FINISHED;
901
902 if (s->session->session_id_length > sizeof s->session->session_id)
903 {
904 SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
905 return -1;
906 }
907 memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);
908 /* p+=s->session->session_id_length; */
909
910 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
911 s->init_num=s->session->session_id_length+1;
912 s->init_off=0;
913 }
914
915 /* SSL2_ST_SEND_SERVER_FINISHED_B */
916 return(ssl2_do_write(s));
917 }
918
919 /* send the request and check the response */
920 static int request_certificate(SSL *s)
921 {
922 const unsigned char *cp;
923 unsigned char *p,*p2,*buf2;
924 unsigned char *ccd;
925 int i,j,ctype,ret= -1;
926 unsigned long len;
927 X509 *x509=NULL;
928 STACK_OF(X509) *sk=NULL;
929
930 ccd=s->s2->tmp.ccl;
931 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
932 {
933 p=(unsigned char *)s->init_buf->data;
934 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
935 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
936 if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
937 return -1;
938 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
939
940 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
941 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
942 s->init_off=0;
943 }
944
945 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
946 {
947 i=ssl2_do_write(s);
948 if (i <= 0)
949 {
950 ret=i;
951 goto end;
952 }
953
954 s->init_num=0;
955 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
956 }
957
958 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
959 {
960 p=(unsigned char *)s->init_buf->data;
961 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */
962 if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3
963 * (probably NO-CERTIFICATE-ERROR) */
964 {
965 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
966 goto end;
967 }
968 s->init_num += i;
969
970 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))
971 {
972 n2s(p,i);
973 if (i != SSL2_PE_NO_CERTIFICATE)
974 {
975 /* not the error message we expected -- let ssl2_part_read handle it */
976 s->init_num -= 3;
977 ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);
978 goto end;
979 }
980
981 if (s->msg_callback)
982 s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */
983
984 /* this is the one place where we can recover from an SSL 2.0 error */
985
986 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
987 {
988 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
989 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
990 goto end;
991 }
992 ret=1;
993 goto end;
994 }
995 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))
996 {
997 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
998 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
999 goto end;
1000 }
1001 if (s->init_num != 6)
1002 {
1003 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1004 goto end;
1005 }
1006
1007 /* ok we have a response */
1008 /* certificate type, there is only one right now. */
1009 ctype= *(p++);
1010 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
1011 {
1012 ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1013 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
1014 goto end;
1015 }
1016 n2s(p,i); s->s2->tmp.clen=i;
1017 n2s(p,i); s->s2->tmp.rlen=i;
1018 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1019 }
1020
1021 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1022 p=(unsigned char *)s->init_buf->data;
1023 len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1024 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
1025 {
1026 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);
1027 goto end;
1028 }
1029 j = (int)len - s->init_num;
1030 i = ssl2_read(s,(char *)&(p[s->init_num]),j);
1031 if (i < j)
1032 {
1033 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1034 goto end;
1035 }
1036 if (s->msg_callback)
1037 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */
1038 p += 6;
1039
1040 cp = p;
1041 x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);
1042 if (x509 == NULL)
1043 {
1044 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
1045 goto msg_end;
1046 }
1047
1048 if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
1049 {
1050 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1051 goto msg_end;
1052 }
1053
1054 i=ssl_verify_cert_chain(s,sk);
1055
1056 if (i > 0) /* we like the packet, now check the chksum */
1057 {
1058 EVP_MD_CTX ctx;
1059 EVP_PKEY *pkey=NULL;
1060
1061 EVP_MD_CTX_init(&ctx);
1062 if (!EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL)
1063 || !EVP_VerifyUpdate(&ctx,s->s2->key_material,
1064 s->s2->key_material_length)
1065 || !EVP_VerifyUpdate(&ctx,ccd,
1066 SSL2_MIN_CERT_CHALLENGE_LENGTH))
1067 goto msg_end;
1068
1069 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
1070 buf2=OPENSSL_malloc((unsigned int)i);
1071 if (buf2 == NULL)
1072 {
1073 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1074 goto msg_end;
1075 }
1076 p2=buf2;
1077 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
1078 if (!EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i))
1079 {
1080 OPENSSL_free(buf2);
1081 goto msg_end;
1082 }
1083 OPENSSL_free(buf2);
1084
1085 pkey=X509_get_pubkey(x509);
1086 if (pkey == NULL) goto end;
1087 i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);
1088 EVP_PKEY_free(pkey);
1089 EVP_MD_CTX_cleanup(&ctx);
1090
1091 if (i > 0)
1092 {
1093 if (s->session->peer != NULL)
1094 X509_free(s->session->peer);
1095 s->session->peer=x509;
1096 CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
1097 s->session->verify_result = s->verify_result;
1098 ret=1;
1099 goto end;
1100 }
1101 else
1102 {
1103 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
1104 goto msg_end;
1105 }
1106 }
1107 else
1108 {
1109 msg_end:
1110 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1111 }
1112 end:
1113 sk_X509_free(sk);
1114 X509_free(x509);
1115 return(ret);
1116 }
1117
1118 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1119 unsigned char *to, int padding)
1120 {
1121 RSA *rsa;
1122 int i;
1123
1124 if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
1125 {
1126 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
1127 return(-1);
1128 }
1129 if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
1130 {
1131 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1132 return(-1);
1133 }
1134 rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1135
1136 /* we have the public key */
1137 i=RSA_private_decrypt(len,from,to,rsa,padding);
1138 if (i < 0)
1139 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
1140 return(i);
1141 }
1142 #else /* !OPENSSL_NO_SSL2 */
1143
1144 # if PEDANTIC
1145 static void *dummy=&dummy;
1146 # endif
1147
1148 #endif