]> git.ipfire.org Git - thirdparty/openssl.git/blob - ssl/s2_srvr.c
projects / thirdparty / openssl.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Import of old SSLeay release: SSLeay 0.8.1b
[thirdparty/openssl.git] / ssl / s2_srvr.c
1 /* ssl/s2_srvr.c */
2 /* Copyright (C) 1995-1997 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 #include <stdio.h>
60 #ifdef NO_MD5
61 #include "md5.h"
62 #endif
63 #include "bio.h"
64 #include "rand.h"
65 #include "objects.h"
66 #include "ssl_locl.h"
67 #include "evp.h"
68
69 #ifndef NOPROTO
70 static int get_client_master_key(SSL *s);
71 static int get_client_hello(SSL *s);
72 static int server_hello(SSL *s);
73 static int get_client_finished(SSL *s);
74 static int server_verify(SSL *s);
75 static int server_finish(SSL *s);
76 static int request_certificate(SSL *s);
77 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
78 unsigned char *to,int padding);
79 #else
80 static int get_client_master_key();
81 static int get_client_hello();
82 static int server_hello();
83 static int get_client_finished();
84 static int server_verify();
85 static int server_finish();
86 static int request_certificate();
87 static int ssl_rsa_private_decrypt();
88 #endif
89
90 #define BREAK break
91
92 static SSL_METHOD *ssl2_get_server_method(ver)
93 int ver;
94 {
95 if (ver == 2)
96 return(SSLv2_server_method());
97 else
98 return(NULL);
99 }
100
101 SSL_METHOD *SSLv2_server_method()
102 {
103 static int init=1;
104 static SSL_METHOD SSLv2_server_data;
105
106 if (init)
107 {
108 init=0;
109 memcpy((char *)&SSLv2_server_data,(char *)sslv2_base_method(),
110 sizeof(SSL_METHOD));
111 SSLv2_server_data.ssl_accept=ssl2_accept;
112 SSLv2_server_data.get_ssl_method=ssl2_get_server_method;
113 }
114 return(&SSLv2_server_data);
115 }
116
117 int ssl2_accept(s)
118 SSL *s;
119 {
120 unsigned long l=time(NULL);
121 BUF_MEM *buf=NULL;
122 int ret= -1;
123 long num1;
124 void (*cb)()=NULL;
125 int new_state,state;
126
127 RAND_seed((unsigned char *)&l,sizeof(l));
128 ERR_clear_error();
129 errno=0;
130
131 if (s->info_callback != NULL)
132 cb=s->info_callback;
133 else if (s->ctx->info_callback != NULL)
134 cb=s->ctx->info_callback;
135
136 /* init things to blank */
137 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
138 s->in_handshake++;
139
140 if (((s->session == NULL) || (s->session->cert == NULL)) &&
141 (s->cert == NULL))
142 {
143 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
144 return(-1);
145 }
146
147 errno=0;
148 for (;;)
149 {
150 state=s->state;
151
152 switch (s->state)
153 {
154 case SSL_ST_BEFORE:
155 case SSL_ST_ACCEPT:
156 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
157 case SSL_ST_OK|SSL_ST_ACCEPT:
158
159 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
160
161 s->version=2;
162 s->type=SSL_ST_ACCEPT;
163
164 buf=s->init_buf;
165 if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
166 { ret= -1; goto end; }
167 if (!BUF_MEM_grow(buf,(int)
168 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
169 { ret= -1; goto end; }
170 s->init_buf=buf;
171 s->init_num=0;
172 s->ctx->sess_accept++;
173 s->handshake_func=ssl2_accept;
174 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
175 BREAK;
176
177 case SSL2_ST_GET_CLIENT_HELLO_A:
178 case SSL2_ST_GET_CLIENT_HELLO_B:
179 case SSL2_ST_GET_CLIENT_HELLO_C:
180 s->shutdown=0;
181 ret=get_client_hello(s);
182 if (ret <= 0) goto end;
183 s->init_num=0;
184 s->state=SSL2_ST_SEND_SERVER_HELLO_A;
185 BREAK;
186
187 case SSL2_ST_SEND_SERVER_HELLO_A:
188 case SSL2_ST_SEND_SERVER_HELLO_B:
189 ret=server_hello(s);
190 if (ret <= 0) goto end;
191 s->init_num=0;
192 if (!s->hit)
193 {
194 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
195 BREAK;
196 }
197 else
198 {
199 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
200 BREAK;
201 }
202 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
203 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
204 ret=get_client_master_key(s);
205 if (ret <= 0) goto end;
206 s->init_num=0;
207 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
208 BREAK;
209
210 case SSL2_ST_SERVER_START_ENCRYPTION:
211 /* Ok we how have sent all the stuff needed to
212 * start encrypting, the next packet back will
213 * be encrypted. */
214 if (!ssl2_enc_init(s,0))
215 { ret= -1; goto end; }
216 s->s2->clear_text=0;
217 s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
218 BREAK;
219
220 case SSL2_ST_SEND_SERVER_VERIFY_A:
221 case SSL2_ST_SEND_SERVER_VERIFY_B:
222 ret=server_verify(s);
223 if (ret <= 0) goto end;
224 s->init_num=0;
225 if (s->hit)
226 {
227 /* If we are in here, we have been
228 * buffering the output, so we need to
229 * flush it and remove buffering from
230 * future traffic */
231 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
232 BREAK;
233 }
234 else
235 {
236 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
237 break;
238 }
239
240 case SSL2_ST_SEND_SERVER_VERIFY_C:
241 /* get the number of bytes to write */
242 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
243 if (num1 != 0)
244 {
245 s->rwstate=SSL_WRITING;
246 num1=BIO_flush(s->wbio);
247 if (num1 <= 0) { ret= -1; goto end; }
248 s->rwstate=SSL_NOTHING;
249 }
250
251 /* flushed and now remove buffering */
252 s->wbio=BIO_pop(s->wbio);
253
254 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
255 BREAK;
256
257 case SSL2_ST_GET_CLIENT_FINISHED_A:
258 case SSL2_ST_GET_CLIENT_FINISHED_B:
259 ret=get_client_finished(s);
260 if (ret <= 0)
261 goto end;
262 s->init_num=0;
263 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
264 BREAK;
265
266 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
267 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
268 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
269 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
270 /* don't do a 'request certificate' if we
271 * don't want to, or we already have one, and
272 * we only want to do it once. */
273 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
274 ((s->session->peer != NULL) &&
275 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
276 {
277 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
278 break;
279 }
280 else
281 {
282 ret=request_certificate(s);
283 if (ret <= 0) goto end;
284 s->init_num=0;
285 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
286 }
287 BREAK;
288
289 case SSL2_ST_SEND_SERVER_FINISHED_A:
290 case SSL2_ST_SEND_SERVER_FINISHED_B:
291 ret=server_finish(s);
292 if (ret <= 0) goto end;
293 s->init_num=0;
294 s->state=SSL_ST_OK;
295 break;
296
297 case SSL_ST_OK:
298 BUF_MEM_free(s->init_buf);
299 s->init_buf=NULL;
300 s->init_num=0;
301 /* ERR_clear_error();*/
302
303 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
304
305 s->ctx->sess_accept_good++;
306 /* s->server=1; */
307 ret=1;
308
309 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
310
311 goto end;
312 BREAK;
313
314 default:
315 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
316 ret= -1;
317 goto end;
318 BREAK;
319 }
320
321 if ((cb != NULL) && (s->state != state))
322 {
323 new_state=s->state;
324 s->state=state;
325 cb(s,SSL_CB_ACCEPT_LOOP,1);
326 s->state=new_state;
327 }
328 }
329 end:
330 s->in_handshake--;
331 if (cb != NULL)
332 cb(s,SSL_CB_ACCEPT_EXIT,ret);
333 return(ret);
334 }
335
336 static int get_client_master_key(s)
337 SSL *s;
338 {
339 int export,i,n,keya,ek;
340 unsigned char *p;
341 SSL_CIPHER *cp;
342 EVP_CIPHER *c;
343 EVP_MD *md;
344
345 p=(unsigned char *)s->init_buf->data;
346 if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
347 {
348 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
349
350 if (i < (10-s->init_num))
351 return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
352 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
353 {
354 if (p[-1] != SSL2_MT_ERROR)
355 {
356 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
357 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
358 }
359 else
360 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
361 SSL_R_PEER_ERROR);
362 return(-1);
363 }
364
365 cp=ssl2_get_cipher_by_char(p);
366 if (cp == NULL)
367 {
368 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
369 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
370 SSL_R_NO_CIPHER_MATCH);
371 return(-1);
372 }
373 s->session->cipher= cp;
374
375 p+=3;
376 n2s(p,i); s->s2->tmp.clear=i;
377 n2s(p,i); s->s2->tmp.enc=i;
378 n2s(p,i); s->session->key_arg_length=i;
379 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
380 s->init_num=0;
381 }
382
383 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
384 p=(unsigned char *)s->init_buf->data;
385 keya=s->session->key_arg_length;
386 n=s->s2->tmp.clear+s->s2->tmp.enc+keya - s->init_num;
387 i=ssl2_read(s,(char *)&(p[s->init_num]),n);
388 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
389
390 memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
391 (unsigned int)keya);
392
393 if (s->session->cert->key->privatekey == NULL)
394 {
395 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
396 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
397 return(-1);
398 }
399 i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
400 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
401 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
402
403 export=(s->session->cipher->algorithms & SSL_EXP)?1:0;
404
405 if (!ssl_cipher_get_evp(s->session->cipher,&c,&md))
406 {
407 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
408 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
409 return(0);
410 }
411
412 if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
413 {
414 export=1;
415 ek=8;
416 }
417 else
418 ek=5;
419
420 /* bad decrypt */
421 #if 1
422 /* If a bad decrypt, continue with protocol but with a
423 * dud master secret */
424 if ((i < 0) ||
425 ((!export && (i != EVP_CIPHER_key_length(c)))
426 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
427 EVP_CIPHER_key_length(c))))))
428 {
429 if (export)
430 i=ek;
431 else
432 i=EVP_CIPHER_key_length(c);
433 RAND_bytes(p,i);
434 }
435 #else
436 if (i < 0)
437 {
438 error=1;
439 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
440 }
441 /* incorrect number of key bytes for non export cipher */
442 else if ((!export && (i != EVP_CIPHER_key_length(c)))
443 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
444 EVP_CIPHER_key_length(c)))))
445 {
446 error=1;
447 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
448 }
449 if (error)
450 {
451 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
452 return(-1);
453 }
454 #endif
455
456 if (export) i+=s->s2->tmp.clear;
457 s->session->master_key_length=i;
458 memcpy(s->session->master_key,p,(unsigned int)i);
459 return(1);
460 }
461
462 static int get_client_hello(s)
463 SSL *s;
464 {
465 int i,n;
466 unsigned char *p;
467 STACK *cs; /* a stack of SSL_CIPHERS */
468 STACK *cl; /* the ones we want to use */
469 int z;
470
471 /* This is a bit of a hack to check for the correct packet
472 * type the first time round. */
473 if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
474 {
475 s->first_packet=1;
476 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
477 }
478
479 p=(unsigned char *)s->init_buf->data;
480 if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
481 {
482 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
483 if (i < (9-s->init_num))
484 return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
485
486 if (*(p++) != SSL2_MT_CLIENT_HELLO)
487 {
488 if (p[-1] != SSL2_MT_ERROR)
489 {
490 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
491 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
492 }
493 else
494 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
495 return(-1);
496 }
497 n2s(p,i);
498 if (i < s->version) s->version=i;
499 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
500 n2s(p,i); s->s2->tmp.session_id_length=i;
501 n2s(p,i); s->s2->challenge_length=i;
502 if ( (i < SSL2_MIN_CHALLENGE_LENGTH) ||
503 (i > SSL2_MAX_CHALLENGE_LENGTH))
504 {
505 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
506 return(-1);
507 }
508 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
509 s->init_num=0;
510 }
511
512 /* SSL2_ST_GET_CLIENT_HELLO_C */
513 p=(unsigned char *)s->init_buf->data;
514 n=s->s2->tmp.cipher_spec_length+s->s2->challenge_length+
515 s->s2->tmp.session_id_length-s->init_num;
516 i=ssl2_read(s,(char *)&(p[s->init_num]),n);
517 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
518
519 /* get session-id before cipher stuff so we can get out session
520 * structure if it is cached */
521 /* session-id */
522 if ((s->s2->tmp.session_id_length != 0) &&
523 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
524 {
525 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
526 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
527 return(-1);
528 }
529
530 if (s->s2->tmp.session_id_length == 0)
531 {
532 if (!ssl_get_new_session(s,1))
533 {
534 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
535 return(-1);
536 }
537 }
538 else
539 {
540 i=ssl_get_prev_session(s,s->s2->tmp.session_id_length,
541 &(p[s->s2->tmp.cipher_spec_length]));
542 if (i == 1)
543 { /* previous session */
544 s->hit=1;
545 }
546 else if (i == -1)
547 {
548 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
549 return(-1);
550 }
551 else
552 {
553 if (s->cert == NULL)
554 {
555 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
556 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
557 return(-1);
558 }
559
560 if (!ssl_get_new_session(s,1))
561 {
562 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
563 return(-1);
564 }
565 }
566 }
567
568 if (!s->hit)
569 {
570 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
571 &s->session->ciphers);
572 if (cs == NULL) goto mem_err;
573
574 cl=ssl_get_ciphers_by_id(s);
575
576 for (z=0; z<sk_num(cs); z++)
577 {
578 if (sk_find(cl,sk_value(cs,z)) < 0)
579 {
580 sk_delete(cs,z);
581 z--;
582 }
583 }
584
585 /* s->session->ciphers should now have a list of
586 * ciphers that are on both the client and server.
587 * This list is ordered by the order the client sent
588 * the ciphers.
589 */
590 }
591 p+=s->s2->tmp.cipher_spec_length;
592 /* done cipher selection */
593
594 /* session id extracted already */
595 p+=s->s2->tmp.session_id_length;
596
597 /* challenge */
598 memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
599 return(1);
600 mem_err:
601 SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
602 return(0);
603 }
604
605 static int server_hello(s)
606 SSL *s;
607 {
608 unsigned char *p,*d;
609 int n,hit;
610 STACK *sk;
611
612 p=(unsigned char *)s->init_buf->data;
613 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
614 {
615 d=p+11;
616 *(p++)=SSL2_MT_SERVER_HELLO; /* type */
617 hit=s->hit;
618 *(p++)=(unsigned char)hit;
619 if (!hit)
620 { /* else add cert to session */
621 CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
622 if (s->session->cert != NULL)
623 ssl_cert_free(s->session->cert);
624 s->session->cert=s->cert;
625 }
626 else /* We have a session id-cache hit, if the
627 * session-id has no certificate listed against
628 * the 'cert' structure, grab the 'old' one
629 * listed against the SSL connection */
630 {
631 if (s->session->cert == NULL)
632 {
633 CRYPTO_add(&s->cert->references,1,
634 CRYPTO_LOCK_SSL_CERT);
635 s->session->cert=s->cert;
636 }
637 }
638
639 if (s->session->cert == NULL)
640 {
641 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
642 SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
643 return(-1);
644 }
645
646 if (hit)
647 {
648 *(p++)=0; /* no certificate type */
649 s2n(s->version,p); /* version */
650 s2n(0,p); /* cert len */
651 s2n(0,p); /* ciphers len */
652 }
653 else
654 {
655 /* EAY EAY */
656 /* put certificate type */
657 *(p++)=SSL2_CT_X509_CERTIFICATE;
658 s2n(s->version,p); /* version */
659 n=i2d_X509(s->cert->key->x509,NULL);
660 s2n(n,p); /* certificate length */
661 i2d_X509(s->cert->key->x509,&d);
662 n=0;
663
664 /* lets send out the ciphers we like in the
665 * prefered order */
666 sk= s->session->ciphers;
667 n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d);
668 d+=n;
669 s2n(n,p); /* add cipher length */
670 }
671
672 /* make and send conn_id */
673 s2n(SSL2_CONNECTION_ID_LENGTH,p); /* add conn_id length */
674 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
675 RAND_bytes(s->s2->conn_id,(int)s->s2->conn_id_length);
676 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
677 d+=SSL2_CONNECTION_ID_LENGTH;
678
679 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
680 s->init_num=d-(unsigned char *)s->init_buf->data;
681 s->init_off=0;
682 }
683 /* SSL2_ST_SEND_SERVER_HELLO_B */
684 /* If we are using TCP/IP, the performace is bad if we do 2
685 * writes without a read between them. This occurs when
686 * Session-id reuse is used, so I will put in a buffering module
687 */
688 if (s->hit)
689 {
690 BIO *buf;
691
692 if (s->bbio == NULL)
693 {
694 buf=BIO_new(BIO_f_buffer());
695 if (buf == NULL)
696 {
697 SSLerr(SSL_F_SERVER_HELLO,ERR_LIB_BUF);
698 return(-1);
699 }
700 s->bbio=buf;
701 }
702 else
703 buf=s->bbio;
704
705 BIO_reset(buf);
706 s->wbio=BIO_push(buf,s->wbio);
707 }
708
709 return(ssl2_do_write(s));
710 }
711
712 static int get_client_finished(s)
713 SSL *s;
714 {
715 unsigned char *p;
716 int i;
717
718 p=(unsigned char *)s->init_buf->data;
719 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
720 {
721 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
722 if (i < 1-s->init_num)
723 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
724
725 if (*p != SSL2_MT_CLIENT_FINISHED)
726 {
727 if (*p != SSL2_MT_ERROR)
728 {
729 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
730 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
731 }
732 else
733 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
734 return(-1);
735 }
736 s->init_num=0;
737 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
738 }
739
740 /* SSL2_ST_GET_CLIENT_FINISHED_B */
741 i=ssl2_read(s,(char *)&(p[s->init_num]),s->s2->conn_id_length-s->init_num);
742 if (i < (int)s->s2->conn_id_length-s->init_num)
743 {
744 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
745 }
746 if (memcmp(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length) != 0)
747 {
748 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
749 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
750 return(-1);
751 }
752 return(1);
753 }
754
755 static int server_verify(s)
756 SSL *s;
757 {
758 unsigned char *p;
759
760 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
761 {
762 p=(unsigned char *)s->init_buf->data;
763 *(p++)=SSL2_MT_SERVER_VERIFY;
764 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
765 /* p+=s->s2->challenge_length; */
766
767 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
768 s->init_num=s->s2->challenge_length+1;
769 s->init_off=0;
770 }
771 return(ssl2_do_write(s));
772 }
773
774 static int server_finish(s)
775 SSL *s;
776 {
777 unsigned char *p;
778
779 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
780 {
781 p=(unsigned char *)s->init_buf->data;
782 *(p++)=SSL2_MT_SERVER_FINISHED;
783
784 memcpy(p,s->session->session_id,
785 (unsigned int)s->session->session_id_length);
786 /* p+=s->session->session_id_length; */
787
788 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
789 s->init_num=s->session->session_id_length+1;
790 s->init_off=0;
791 }
792
793 /* SSL2_ST_SEND_SERVER_FINISHED_B */
794 return(ssl2_do_write(s));
795 }
796
797 /* send the request and check the response */
798 static int request_certificate(s)
799 SSL *s;
800 {
801 unsigned char *p,*p2,*buf2;
802 unsigned char *ccd;
803 int i,j,ctype,ret= -1;
804 X509 *x509=NULL;
805 STACK *sk=NULL;
806
807 ccd=s->s2->tmp.ccl;
808 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
809 {
810 p=(unsigned char *)s->init_buf->data;
811 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
812 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
813 RAND_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
814 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
815
816 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
817 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
818 s->init_off=0;
819 }
820
821 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
822 {
823 i=ssl2_do_write(s);
824 if (i <= 0)
825 {
826 ret=i;
827 goto end;
828 }
829
830 s->init_num=0;
831 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
832 }
833
834 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
835 {
836 p=(unsigned char *)s->init_buf->data;
837 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num);
838 if (i < 3)
839 {
840 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
841 goto end;
842 }
843
844 if ((*p == SSL2_MT_ERROR) && (i >= 3))
845 {
846 n2s(p,i);
847 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
848 {
849 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
850 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
851 goto end;
852 }
853 ret=1;
854 goto end;
855 }
856 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (i < 6))
857 {
858 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
859 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
860 goto end;
861 }
862 /* ok we have a response */
863 /* certificate type, there is only one right now. */
864 ctype= *(p++);
865 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
866 {
867 ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
868 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
869 goto end;
870 }
871 n2s(p,i); s->s2->tmp.clen=i;
872 n2s(p,i); s->s2->tmp.rlen=i;
873 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
874 s->init_num=0;
875 }
876
877 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
878 p=(unsigned char *)s->init_buf->data;
879 j=s->s2->tmp.clen+s->s2->tmp.rlen-s->init_num;
880 i=ssl2_read(s,(char *)&(p[s->init_num]),j);
881 if (i < j)
882 {
883 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
884 goto end;
885 }
886
887 x509=(X509 *)d2i_X509(NULL,&p,(long)s->s2->tmp.clen);
888 if (x509 == NULL)
889 {
890 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
891 goto msg_end;
892 }
893
894 if (((sk=sk_new_null()) == NULL) || (!sk_push(sk,(char *)x509)))
895 {
896 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
897 goto msg_end;
898 }
899
900 i=ssl_verify_cert_chain(s,sk);
901
902 if (i) /* we like the packet, now check the chksum */
903 {
904 EVP_MD_CTX ctx;
905 EVP_PKEY *pkey=NULL;
906
907 EVP_VerifyInit(&ctx,EVP_md5());
908 EVP_VerifyUpdate(&ctx,s->s2->key_material,
909 (unsigned int)s->s2->key_material_length);
910 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
911
912 i=i2d_X509(s->session->cert->key->x509,NULL);
913 buf2=(unsigned char *)Malloc((unsigned int)i);
914 if (buf2 == NULL)
915 {
916 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
917 goto msg_end;
918 }
919 p2=buf2;
920 i=i2d_X509(s->session->cert->key->x509,&p2);
921 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
922 Free(buf2);
923
924 pkey=X509_get_pubkey(x509);
925 if (pkey == NULL) goto end;
926 i=EVP_VerifyFinal(&ctx,p,s->s2->tmp.rlen,pkey);
927 memset(&ctx,0,sizeof(ctx));
928
929 if (i)
930 {
931 if (s->session->peer != NULL)
932 X509_free(s->session->peer);
933 s->session->peer=x509;
934 CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
935 ret=1;
936 goto end;
937 }
938 else
939 {
940 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
941 goto msg_end;
942 }
943 }
944 else
945 {
946 msg_end:
947 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
948 }
949 end:
950 if (sk != NULL) sk_free(sk);
951 if (x509 != NULL) X509_free(x509);
952 return(ret);
953 }
954
955 static int ssl_rsa_private_decrypt(c, len, from, to,padding)
956 CERT *c;
957 int len;
958 unsigned char *from;
959 unsigned char *to;
960 int padding;
961 {
962 RSA *rsa;
963 int i;
964
965 if ((c == NULL) || (c->key->privatekey == NULL))
966 {
967 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
968 return(-1);
969 }
970 if (c->key->privatekey->type != EVP_PKEY_RSA)
971 {
972 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
973 return(-1);
974 }
975 rsa=c->key->privatekey->pkey.rsa;
976
977 /* we have the public key */
978 i=RSA_private_decrypt(len,from,to,rsa,padding);
979 if (i < 0)
980 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
981 return(i);
982 }
983
A mirror of the official openssl repository