Import OpenSSL-1.0.0b.
[dragonfly.git] / crypto / openssl / ssl / s2_srvr.c
CommitLineData
56276539
SS
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
919b01cc 120static const SSL_METHOD *ssl2_get_server_method(int ver);
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121static int get_client_master_key(SSL *s);
122static int get_client_hello(SSL *s);
123static int server_hello(SSL *s);
124static int get_client_finished(SSL *s);
125static int server_verify(SSL *s);
126static int server_finish(SSL *s);
127static int request_certificate(SSL *s);
128static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
129 unsigned char *to,int padding);
130#define BREAK break
131
919b01cc 132static const SSL_METHOD *ssl2_get_server_method(int ver)
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133 {
134 if (ver == SSL2_VERSION)
135 return(SSLv2_server_method());
136 else
137 return(NULL);
138 }
139
5bd86ce5
SS
140IMPLEMENT_ssl2_meth_func(SSLv2_server_method,
141 ssl2_accept,
142 ssl_undefined_function,
143 ssl2_get_server_method)
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144
145int ssl2_accept(SSL *s)
146 {
74093195 147 unsigned long l=(unsigned long)time(NULL);
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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);
5f042374 270 if (num1 > 0)
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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 }
357end:
358 s->in_handshake--;
359 if (cb != NULL)
360 cb(s,SSL_CB_ACCEPT_EXIT,ret);
361 return(ret);
362 }
363
364static int get_client_master_key(SSL *s)
365 {
366 int is_export,i,n,keya,ek;
367 unsigned long len;
368 unsigned char *p;
919b01cc 369 const SSL_CIPHER *cp;
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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); s->session->key_arg_length=i;
407 if(s->session->key_arg_length > 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->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
414 }
415
416 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
417 p=(unsigned char *)s->init_buf->data;
418 if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
419 {
420 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
421 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
422 return -1;
423 }
424 keya=s->session->key_arg_length;
425 len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya;
426 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
427 {
428 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
429 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);
430 return -1;
431 }
432 n = (int)len - s->init_num;
433 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
434 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
435 if (s->msg_callback)
436 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */
437 p += 10;
438
439 memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
440 (unsigned int)keya);
441
442 if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
443 {
444 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
445 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
446 return(-1);
447 }
448 i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
449 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
450 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
451
452 is_export=SSL_C_IS_EXPORT(s->session->cipher);
453
919b01cc 454 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL))
56276539
SS
455 {
456 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
457 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
458 return(0);
459 }
460
461 if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
462 {
463 is_export=1;
464 ek=8;
465 }
466 else
467 ek=5;
468
469 /* bad decrypt */
470#if 1
471 /* If a bad decrypt, continue with protocol but with a
472 * random master secret (Bleichenbacher attack) */
473 if ((i < 0) ||
474 ((!is_export && (i != EVP_CIPHER_key_length(c)))
475 || (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i !=
476 (unsigned int)EVP_CIPHER_key_length(c))))))
477 {
478 ERR_clear_error();
479 if (is_export)
480 i=ek;
481 else
482 i=EVP_CIPHER_key_length(c);
483 if (RAND_pseudo_bytes(p,i) <= 0)
484 return 0;
485 }
486#else
487 if (i < 0)
488 {
489 error=1;
490 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
491 }
492 /* incorrect number of key bytes for non export cipher */
493 else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
494 || (is_export && ((i != ek) || (s->s2->tmp.clear+i !=
495 EVP_CIPHER_key_length(c)))))
496 {
497 error=1;
498 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
499 }
500 if (error)
501 {
502 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
503 return(-1);
504 }
505#endif
506
507 if (is_export) i+=s->s2->tmp.clear;
508
509 if (i > SSL_MAX_MASTER_KEY_LENGTH)
510 {
511 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
512 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
513 return -1;
514 }
515 s->session->master_key_length=i;
516 memcpy(s->session->master_key,p,(unsigned int)i);
517 return(1);
518 }
519
520static int get_client_hello(SSL *s)
521 {
522 int i,n;
523 unsigned long len;
524 unsigned char *p;
525 STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
526 STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
527 STACK_OF(SSL_CIPHER) *prio, *allow;
528 int z;
529
530 /* This is a bit of a hack to check for the correct packet
531 * type the first time round. */
532 if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
533 {
534 s->first_packet=1;
535 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
536 }
537
538 p=(unsigned char *)s->init_buf->data;
539 if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
540 {
541 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
542 if (i < (9-s->init_num))
543 return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
544 s->init_num = 9;
545
546 if (*(p++) != SSL2_MT_CLIENT_HELLO)
547 {
548 if (p[-1] != SSL2_MT_ERROR)
549 {
550 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
551 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
552 }
553 else
554 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
555 return(-1);
556 }
557 n2s(p,i);
558 if (i < s->version) s->version=i;
559 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
560 n2s(p,i); s->s2->tmp.session_id_length=i;
561 n2s(p,i); s->s2->challenge_length=i;
562 if ( (i < SSL2_MIN_CHALLENGE_LENGTH) ||
563 (i > SSL2_MAX_CHALLENGE_LENGTH))
564 {
565 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
566 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
567 return(-1);
568 }
569 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
570 }
571
572 /* SSL2_ST_GET_CLIENT_HELLO_C */
573 p=(unsigned char *)s->init_buf->data;
574 len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;
575 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
576 {
577 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
578 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);
579 return -1;
580 }
581 n = (int)len - s->init_num;
582 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
583 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
584 if (s->msg_callback)
585 s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */
586 p += 9;
587
588 /* get session-id before cipher stuff so we can get out session
589 * structure if it is cached */
590 /* session-id */
591 if ((s->s2->tmp.session_id_length != 0) &&
592 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
593 {
594 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
595 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
596 return(-1);
597 }
598
599 if (s->s2->tmp.session_id_length == 0)
600 {
601 if (!ssl_get_new_session(s,1))
602 {
603 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
604 return(-1);
605 }
606 }
607 else
608 {
609 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
e6bc27f5 610 s->s2->tmp.session_id_length, NULL);
56276539
SS
611 if (i == 1)
612 { /* previous session */
613 s->hit=1;
614 }
615 else if (i == -1)
616 {
617 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
618 return(-1);
619 }
620 else
621 {
622 if (s->cert == NULL)
623 {
624 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
625 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
626 return(-1);
627 }
628
629 if (!ssl_get_new_session(s,1))
630 {
631 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
632 return(-1);
633 }
634 }
635 }
636
637 if (!s->hit)
638 {
639 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
640 &s->session->ciphers);
641 if (cs == NULL) goto mem_err;
642
643 cl=SSL_get_ciphers(s);
644
645 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
646 {
647 prio=sk_SSL_CIPHER_dup(cl);
648 if (prio == NULL) goto mem_err;
649 allow = cs;
650 }
651 else
652 {
653 prio = cs;
654 allow = cl;
655 }
656 for (z=0; z<sk_SSL_CIPHER_num(prio); z++)
657 {
658 if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0)
659 {
e6bc27f5 660 (void)sk_SSL_CIPHER_delete(prio,z);
56276539
SS
661 z--;
662 }
663 }
664 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
665 {
666 sk_SSL_CIPHER_free(s->session->ciphers);
667 s->session->ciphers = prio;
668 }
669 /* s->session->ciphers should now have a list of
670 * ciphers that are on both the client and server.
671 * This list is ordered by the order the client sent
672 * the ciphers or in the order of the server's preference
673 * if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
674 */
675 }
676 p+=s->s2->tmp.cipher_spec_length;
677 /* done cipher selection */
678
679 /* session id extracted already */
680 p+=s->s2->tmp.session_id_length;
681
682 /* challenge */
683 if (s->s2->challenge_length > sizeof s->s2->challenge)
684 {
685 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
686 SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
687 return -1;
688 }
689 memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
690 return(1);
691mem_err:
692 SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
693 return(0);
694 }
695
696static int server_hello(SSL *s)
697 {
698 unsigned char *p,*d;
699 int n,hit;
56276539
SS
700
701 p=(unsigned char *)s->init_buf->data;
702 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
703 {
704 d=p+11;
705 *(p++)=SSL2_MT_SERVER_HELLO; /* type */
706 hit=s->hit;
707 *(p++)=(unsigned char)hit;
708#if 1
709 if (!hit)
710 {
711 if (s->session->sess_cert != NULL)
712 /* This can't really happen because get_client_hello
713 * has called ssl_get_new_session, which does not set
714 * sess_cert. */
715 ssl_sess_cert_free(s->session->sess_cert);
716 s->session->sess_cert = ssl_sess_cert_new();
717 if (s->session->sess_cert == NULL)
718 {
719 SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
720 return(-1);
721 }
722 }
723 /* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
724 * depending on whether it survived in the internal cache
725 * or was retrieved from an external cache.
726 * If it is NULL, we cannot put any useful data in it anyway,
727 * so we don't touch it.
728 */
729
730#else /* That's what used to be done when cert_st and sess_cert_st were
731 * the same. */
732 if (!hit)
733 { /* else add cert to session */
734 CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
735 if (s->session->sess_cert != NULL)
736 ssl_cert_free(s->session->sess_cert);
737 s->session->sess_cert=s->cert;
738 }
739 else /* We have a session id-cache hit, if the
740 * session-id has no certificate listed against
741 * the 'cert' structure, grab the 'old' one
742 * listed against the SSL connection */
743 {
744 if (s->session->sess_cert == NULL)
745 {
746 CRYPTO_add(&s->cert->references,1,
747 CRYPTO_LOCK_SSL_CERT);
748 s->session->sess_cert=s->cert;
749 }
750 }
751#endif
752
753 if (s->cert == NULL)
754 {
755 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
756 SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
757 return(-1);
758 }
759
760 if (hit)
761 {
762 *(p++)=0; /* no certificate type */
763 s2n(s->version,p); /* version */
764 s2n(0,p); /* cert len */
765 s2n(0,p); /* ciphers len */
766 }
767 else
768 {
769 /* EAY EAY */
770 /* put certificate type */
771 *(p++)=SSL2_CT_X509_CERTIFICATE;
772 s2n(s->version,p); /* version */
773 n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
774 s2n(n,p); /* certificate length */
775 i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
776 n=0;
777
778 /* lets send out the ciphers we like in the
779 * prefered order */
56276539
SS
780 n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);
781 d+=n;
782 s2n(n,p); /* add cipher length */
783 }
784
785 /* make and send conn_id */
786 s2n(SSL2_CONNECTION_ID_LENGTH,p); /* add conn_id length */
787 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
788 if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)
789 return -1;
790 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
791 d+=SSL2_CONNECTION_ID_LENGTH;
792
793 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
794 s->init_num=d-(unsigned char *)s->init_buf->data;
795 s->init_off=0;
796 }
797 /* SSL2_ST_SEND_SERVER_HELLO_B */
798 /* If we are using TCP/IP, the performance is bad if we do 2
799 * writes without a read between them. This occurs when
800 * Session-id reuse is used, so I will put in a buffering module
801 */
802 if (s->hit)
803 {
804 if (!ssl_init_wbio_buffer(s,1)) return(-1);
805 }
806
807 return(ssl2_do_write(s));
808 }
809
810static int get_client_finished(SSL *s)
811 {
812 unsigned char *p;
813 int i, n;
814 unsigned long len;
815
816 p=(unsigned char *)s->init_buf->data;
817 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
818 {
819 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
820 if (i < 1-s->init_num)
821 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
822 s->init_num += i;
823
824 if (*p != SSL2_MT_CLIENT_FINISHED)
825 {
826 if (*p != SSL2_MT_ERROR)
827 {
828 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
829 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
830 }
831 else
832 {
833 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
834 /* try to read the error message */
835 i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
836 return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
837 }
838 return(-1);
839 }
840 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
841 }
842
843 /* SSL2_ST_GET_CLIENT_FINISHED_B */
844 if (s->s2->conn_id_length > sizeof s->s2->conn_id)
845 {
846 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
847 SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
848 return -1;
849 }
850 len = 1 + (unsigned long)s->s2->conn_id_length;
851 n = (int)len - s->init_num;
852 i = ssl2_read(s,(char *)&(p[s->init_num]),n);
853 if (i < n)
854 {
855 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
856 }
857 if (s->msg_callback)
858 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */
859 p += 1;
860 if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)
861 {
862 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
863 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
864 return(-1);
865 }
866 return(1);
867 }
868
869static int server_verify(SSL *s)
870 {
871 unsigned char *p;
872
873 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
874 {
875 p=(unsigned char *)s->init_buf->data;
876 *(p++)=SSL2_MT_SERVER_VERIFY;
877 if (s->s2->challenge_length > sizeof s->s2->challenge)
878 {
879 SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
880 return -1;
881 }
882 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
883 /* p+=s->s2->challenge_length; */
884
885 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
886 s->init_num=s->s2->challenge_length+1;
887 s->init_off=0;
888 }
889 return(ssl2_do_write(s));
890 }
891
892static int server_finish(SSL *s)
893 {
894 unsigned char *p;
895
896 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
897 {
898 p=(unsigned char *)s->init_buf->data;
899 *(p++)=SSL2_MT_SERVER_FINISHED;
900
901 if (s->session->session_id_length > sizeof s->session->session_id)
902 {
903 SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
904 return -1;
905 }
906 memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);
907 /* p+=s->session->session_id_length; */
908
909 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
910 s->init_num=s->session->session_id_length+1;
911 s->init_off=0;
912 }
913
914 /* SSL2_ST_SEND_SERVER_FINISHED_B */
915 return(ssl2_do_write(s));
916 }
917
918/* send the request and check the response */
919static int request_certificate(SSL *s)
920 {
921 const unsigned char *cp;
922 unsigned char *p,*p2,*buf2;
923 unsigned char *ccd;
924 int i,j,ctype,ret= -1;
925 unsigned long len;
926 X509 *x509=NULL;
927 STACK_OF(X509) *sk=NULL;
928
929 ccd=s->s2->tmp.ccl;
930 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
931 {
932 p=(unsigned char *)s->init_buf->data;
933 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
934 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
935 if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
936 return -1;
937 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
938
939 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
940 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
941 s->init_off=0;
942 }
943
944 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
945 {
946 i=ssl2_do_write(s);
947 if (i <= 0)
948 {
949 ret=i;
950 goto end;
951 }
952
953 s->init_num=0;
954 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
955 }
956
957 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
958 {
959 p=(unsigned char *)s->init_buf->data;
960 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */
961 if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3
962 * (probably NO-CERTIFICATE-ERROR) */
963 {
964 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
965 goto end;
966 }
967 s->init_num += i;
968
969 if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))
970 {
971 n2s(p,i);
972 if (i != SSL2_PE_NO_CERTIFICATE)
973 {
974 /* not the error message we expected -- let ssl2_part_read handle it */
975 s->init_num -= 3;
976 ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);
977 goto end;
978 }
979
980 if (s->msg_callback)
981 s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */
982
983 /* this is the one place where we can recover from an SSL 2.0 error */
984
985 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
986 {
987 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
988 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
989 goto end;
990 }
991 ret=1;
992 goto end;
993 }
994 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))
995 {
996 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
997 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
998 goto end;
999 }
1000 if (s->init_num != 6)
1001 {
1002 SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1003 goto end;
1004 }
1005
1006 /* ok we have a response */
1007 /* certificate type, there is only one right now. */
1008 ctype= *(p++);
1009 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
1010 {
1011 ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
1012 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
1013 goto end;
1014 }
1015 n2s(p,i); s->s2->tmp.clen=i;
1016 n2s(p,i); s->s2->tmp.rlen=i;
1017 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
1018 }
1019
1020 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
1021 p=(unsigned char *)s->init_buf->data;
1022 len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
1023 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
1024 {
1025 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);
1026 goto end;
1027 }
1028 j = (int)len - s->init_num;
1029 i = ssl2_read(s,(char *)&(p[s->init_num]),j);
1030 if (i < j)
1031 {
1032 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
1033 goto end;
1034 }
1035 if (s->msg_callback)
1036 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */
1037 p += 6;
1038
1039 cp = p;
1040 x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);
1041 if (x509 == NULL)
1042 {
1043 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
1044 goto msg_end;
1045 }
1046
1047 if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
1048 {
1049 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1050 goto msg_end;
1051 }
1052
1053 i=ssl_verify_cert_chain(s,sk);
1054
730b1645 1055 if (i > 0) /* we like the packet, now check the chksum */
56276539
SS
1056 {
1057 EVP_MD_CTX ctx;
1058 EVP_PKEY *pkey=NULL;
1059
1060 EVP_MD_CTX_init(&ctx);
1061 EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL);
1062 EVP_VerifyUpdate(&ctx,s->s2->key_material,
1063 s->s2->key_material_length);
1064 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
1065
1066 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
1067 buf2=OPENSSL_malloc((unsigned int)i);
1068 if (buf2 == NULL)
1069 {
1070 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1071 goto msg_end;
1072 }
1073 p2=buf2;
1074 i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
1075 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
1076 OPENSSL_free(buf2);
1077
1078 pkey=X509_get_pubkey(x509);
1079 if (pkey == NULL) goto end;
1080 i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);
1081 EVP_PKEY_free(pkey);
1082 EVP_MD_CTX_cleanup(&ctx);
1083
730b1645 1084 if (i > 0)
56276539
SS
1085 {
1086 if (s->session->peer != NULL)
1087 X509_free(s->session->peer);
1088 s->session->peer=x509;
1089 CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
1090 s->session->verify_result = s->verify_result;
1091 ret=1;
1092 goto end;
1093 }
1094 else
1095 {
1096 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
1097 goto msg_end;
1098 }
1099 }
1100 else
1101 {
1102msg_end:
1103 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
1104 }
1105end:
1106 sk_X509_free(sk);
1107 X509_free(x509);
1108 return(ret);
1109 }
1110
1111static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
1112 unsigned char *to, int padding)
1113 {
1114 RSA *rsa;
1115 int i;
1116
1117 if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
1118 {
1119 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
1120 return(-1);
1121 }
1122 if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
1123 {
1124 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
1125 return(-1);
1126 }
1127 rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
1128
1129 /* we have the public key */
1130 i=RSA_private_decrypt(len,from,to,rsa,padding);
1131 if (i < 0)
1132 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
1133 return(i);
1134 }
1135#else /* !OPENSSL_NO_SSL2 */
1136
1137# if PEDANTIC
1138static void *dummy=&dummy;
1139# endif
1140
1141#endif