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Change #include filenames from <foo.h> to <openssl.h>.
[thirdparty/openssl.git] / ssl / s2_srvr.c
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 #include <stdio.h>
60 #include <openssl/bio.h>
61 #include <openssl/rand.h>
62 #include <openssl/objects.h>
63 #include "ssl_locl.h"
64 #include <openssl/evp.h>
65
66 #ifndef NOPROTO
67 static SSL_METHOD *ssl2_get_server_method(int ver);
68 static int get_client_master_key(SSL *s);
69 static int get_client_hello(SSL *s);
70 static int server_hello(SSL *s);
71 static int get_client_finished(SSL *s);
72 static int server_verify(SSL *s);
73 static int server_finish(SSL *s);
74 static int request_certificate(SSL *s);
75 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
76 unsigned char *to,int padding);
77 #else
78 static SSL_METHOD *ssl2_get_server_method();
79 static int get_client_master_key();
80 static int get_client_hello();
81 static int server_hello();
82 static int get_client_finished();
83 static int server_verify();
84 static int server_finish();
85 static int request_certificate();
86 static int ssl_rsa_private_decrypt();
87 #endif
88
89 #define BREAK break
90
91 static SSL_METHOD *ssl2_get_server_method(int ver)
92 {
93 if (ver == SSL2_VERSION)
94 return(SSLv2_server_method());
95 else
96 return(NULL);
97 }
98
99 SSL_METHOD *SSLv2_server_method(void)
100 {
101 static int init=1;
102 static SSL_METHOD SSLv2_server_data;
103
104 if (init)
105 {
106 memcpy((char *)&SSLv2_server_data,(char *)sslv2_base_method(),
107 sizeof(SSL_METHOD));
108 SSLv2_server_data.ssl_accept=ssl2_accept;
109 SSLv2_server_data.get_ssl_method=ssl2_get_server_method;
110 init=0;
111 }
112 return(&SSLv2_server_data);
113 }
114
115 int ssl2_accept(SSL *s)
116 {
117 unsigned long l=time(NULL);
118 BUF_MEM *buf=NULL;
119 int ret= -1;
120 long num1;
121 void (*cb)()=NULL;
122 int new_state,state;
123
124 RAND_seed(&l,sizeof(l));
125 ERR_clear_error();
126 clear_sys_error();
127
128 if (s->info_callback != NULL)
129 cb=s->info_callback;
130 else if (s->ctx->info_callback != NULL)
131 cb=s->ctx->info_callback;
132
133 /* init things to blank */
134 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
135 s->in_handshake++;
136
137 if (((s->session == NULL) || (s->session->cert == NULL)) &&
138 (s->cert == NULL))
139 {
140 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
141 return(-1);
142 }
143
144 clear_sys_error();
145 for (;;)
146 {
147 state=s->state;
148
149 switch (s->state)
150 {
151 case SSL_ST_BEFORE:
152 case SSL_ST_ACCEPT:
153 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
154 case SSL_ST_OK|SSL_ST_ACCEPT:
155
156 s->server=1;
157 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
158
159 s->version=SSL2_VERSION;
160 s->type=SSL_ST_ACCEPT;
161
162 buf=s->init_buf;
163 if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
164 { ret= -1; goto end; }
165 if (!BUF_MEM_grow(buf,(int)
166 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
167 { ret= -1; goto end; }
168 s->init_buf=buf;
169 s->init_num=0;
170 s->ctx->stats.sess_accept++;
171 s->handshake_func=ssl2_accept;
172 s->state=SSL2_ST_GET_CLIENT_HELLO_A;
173 BREAK;
174
175 case SSL2_ST_GET_CLIENT_HELLO_A:
176 case SSL2_ST_GET_CLIENT_HELLO_B:
177 case SSL2_ST_GET_CLIENT_HELLO_C:
178 s->shutdown=0;
179 ret=get_client_hello(s);
180 if (ret <= 0) goto end;
181 s->init_num=0;
182 s->state=SSL2_ST_SEND_SERVER_HELLO_A;
183 BREAK;
184
185 case SSL2_ST_SEND_SERVER_HELLO_A:
186 case SSL2_ST_SEND_SERVER_HELLO_B:
187 ret=server_hello(s);
188 if (ret <= 0) goto end;
189 s->init_num=0;
190 if (!s->hit)
191 {
192 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
193 BREAK;
194 }
195 else
196 {
197 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
198 BREAK;
199 }
200 case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
201 case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
202 ret=get_client_master_key(s);
203 if (ret <= 0) goto end;
204 s->init_num=0;
205 s->state=SSL2_ST_SERVER_START_ENCRYPTION;
206 BREAK;
207
208 case SSL2_ST_SERVER_START_ENCRYPTION:
209 /* Ok we how have sent all the stuff needed to
210 * start encrypting, the next packet back will
211 * be encrypted. */
212 if (!ssl2_enc_init(s,0))
213 { ret= -1; goto end; }
214 s->s2->clear_text=0;
215 s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
216 BREAK;
217
218 case SSL2_ST_SEND_SERVER_VERIFY_A:
219 case SSL2_ST_SEND_SERVER_VERIFY_B:
220 ret=server_verify(s);
221 if (ret <= 0) goto end;
222 s->init_num=0;
223 if (s->hit)
224 {
225 /* If we are in here, we have been
226 * buffering the output, so we need to
227 * flush it and remove buffering from
228 * future traffic */
229 s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
230 BREAK;
231 }
232 else
233 {
234 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
235 break;
236 }
237
238 case SSL2_ST_SEND_SERVER_VERIFY_C:
239 /* get the number of bytes to write */
240 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
241 if (num1 != 0)
242 {
243 s->rwstate=SSL_WRITING;
244 num1=BIO_flush(s->wbio);
245 if (num1 <= 0) { ret= -1; goto end; }
246 s->rwstate=SSL_NOTHING;
247 }
248
249 /* flushed and now remove buffering */
250 s->wbio=BIO_pop(s->wbio);
251
252 s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
253 BREAK;
254
255 case SSL2_ST_GET_CLIENT_FINISHED_A:
256 case SSL2_ST_GET_CLIENT_FINISHED_B:
257 ret=get_client_finished(s);
258 if (ret <= 0)
259 goto end;
260 s->init_num=0;
261 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
262 BREAK;
263
264 case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
265 case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
266 case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
267 case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
268 /* don't do a 'request certificate' if we
269 * don't want to, or we already have one, and
270 * we only want to do it once. */
271 if (!(s->verify_mode & SSL_VERIFY_PEER) ||
272 ((s->session->peer != NULL) &&
273 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
274 {
275 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
276 break;
277 }
278 else
279 {
280 ret=request_certificate(s);
281 if (ret <= 0) goto end;
282 s->init_num=0;
283 s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
284 }
285 BREAK;
286
287 case SSL2_ST_SEND_SERVER_FINISHED_A:
288 case SSL2_ST_SEND_SERVER_FINISHED_B:
289 ret=server_finish(s);
290 if (ret <= 0) goto end;
291 s->init_num=0;
292 s->state=SSL_ST_OK;
293 break;
294
295 case SSL_ST_OK:
296 BUF_MEM_free(s->init_buf);
297 ssl_free_wbio_buffer(s);
298 s->init_buf=NULL;
299 s->init_num=0;
300 /* ERR_clear_error();*/
301
302 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
303
304 s->ctx->stats.sess_accept_good++;
305 /* s->server=1; */
306 ret=1;
307
308 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
309
310 goto end;
311 /* BREAK; */
312
313 default:
314 SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
315 ret= -1;
316 goto end;
317 /* BREAK; */
318 }
319
320 if ((cb != NULL) && (s->state != state))
321 {
322 new_state=s->state;
323 s->state=state;
324 cb(s,SSL_CB_ACCEPT_LOOP,1);
325 s->state=new_state;
326 }
327 }
328 end:
329 s->in_handshake--;
330 if (cb != NULL)
331 cb(s,SSL_CB_ACCEPT_EXIT,ret);
332 return(ret);
333 }
334
335 static int get_client_master_key(SSL *s)
336 {
337 int export,i,n,keya,ek;
338 unsigned char *p;
339 SSL_CIPHER *cp;
340 const EVP_CIPHER *c;
341 const EVP_MD *md;
342
343 p=(unsigned char *)s->init_buf->data;
344 if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
345 {
346 i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
347
348 if (i < (10-s->init_num))
349 return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
350 if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
351 {
352 if (p[-1] != SSL2_MT_ERROR)
353 {
354 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
355 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
356 }
357 else
358 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
359 SSL_R_PEER_ERROR);
360 return(-1);
361 }
362
363 cp=ssl2_get_cipher_by_char(p);
364 if (cp == NULL)
365 {
366 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
367 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,
368 SSL_R_NO_CIPHER_MATCH);
369 return(-1);
370 }
371 s->session->cipher= cp;
372
373 p+=3;
374 n2s(p,i); s->s2->tmp.clear=i;
375 n2s(p,i); s->s2->tmp.enc=i;
376 n2s(p,i); s->session->key_arg_length=i;
377 s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
378 s->init_num=0;
379 }
380
381 /* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
382 p=(unsigned char *)s->init_buf->data;
383 keya=s->session->key_arg_length;
384 n=s->s2->tmp.clear+s->s2->tmp.enc+keya - s->init_num;
385 i=ssl2_read(s,(char *)&(p[s->init_num]),n);
386 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
387
388 memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
389 (unsigned int)keya);
390
391 if (s->session->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
392 {
393 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
394 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
395 return(-1);
396 }
397 i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
398 &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
399 (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
400
401 export=SSL_C_IS_EXPORT(s->session->cipher);
402
403 if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
404 {
405 ssl2_return_error(s,SSL2_PE_NO_CIPHER);
406 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
407 return(0);
408 }
409
410 if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
411 {
412 export=1;
413 ek=8;
414 }
415 else
416 ek=5;
417
418 /* bad decrypt */
419 #if 1
420 /* If a bad decrypt, continue with protocol but with a
421 * dud master secret */
422 if ((i < 0) ||
423 ((!export && (i != EVP_CIPHER_key_length(c)))
424 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
425 EVP_CIPHER_key_length(c))))))
426 {
427 if (export)
428 i=ek;
429 else
430 i=EVP_CIPHER_key_length(c);
431 RAND_bytes(p,i);
432 }
433 #else
434 if (i < 0)
435 {
436 error=1;
437 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
438 }
439 /* incorrect number of key bytes for non export cipher */
440 else if ((!export && (i != EVP_CIPHER_key_length(c)))
441 || ( export && ((i != ek) || (s->s2->tmp.clear+i !=
442 EVP_CIPHER_key_length(c)))))
443 {
444 error=1;
445 SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
446 }
447 if (error)
448 {
449 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
450 return(-1);
451 }
452 #endif
453
454 if (export) i+=s->s2->tmp.clear;
455 s->session->master_key_length=i;
456 memcpy(s->session->master_key,p,(unsigned int)i);
457 return(1);
458 }
459
460 static int get_client_hello(SSL *s)
461 {
462 int i,n;
463 unsigned char *p;
464 STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
465 STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
466 int z;
467
468 /* This is a bit of a hack to check for the correct packet
469 * type the first time round. */
470 if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
471 {
472 s->first_packet=1;
473 s->state=SSL2_ST_GET_CLIENT_HELLO_B;
474 }
475
476 p=(unsigned char *)s->init_buf->data;
477 if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
478 {
479 i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
480 if (i < (9-s->init_num))
481 return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
482
483 if (*(p++) != SSL2_MT_CLIENT_HELLO)
484 {
485 if (p[-1] != SSL2_MT_ERROR)
486 {
487 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
488 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
489 }
490 else
491 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
492 return(-1);
493 }
494 n2s(p,i);
495 if (i < s->version) s->version=i;
496 n2s(p,i); s->s2->tmp.cipher_spec_length=i;
497 n2s(p,i); s->s2->tmp.session_id_length=i;
498 n2s(p,i); s->s2->challenge_length=i;
499 if ( (i < SSL2_MIN_CHALLENGE_LENGTH) ||
500 (i > SSL2_MAX_CHALLENGE_LENGTH))
501 {
502 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
503 return(-1);
504 }
505 s->state=SSL2_ST_GET_CLIENT_HELLO_C;
506 s->init_num=0;
507 }
508
509 /* SSL2_ST_GET_CLIENT_HELLO_C */
510 p=(unsigned char *)s->init_buf->data;
511 n=s->s2->tmp.cipher_spec_length+s->s2->challenge_length+
512 s->s2->tmp.session_id_length-s->init_num;
513 i=ssl2_read(s,(char *)&(p[s->init_num]),n);
514 if (i != n) return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
515
516 /* get session-id before cipher stuff so we can get out session
517 * structure if it is cached */
518 /* session-id */
519 if ((s->s2->tmp.session_id_length != 0) &&
520 (s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
521 {
522 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
523 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
524 return(-1);
525 }
526
527 if (s->s2->tmp.session_id_length == 0)
528 {
529 if (!ssl_get_new_session(s,1))
530 {
531 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
532 return(-1);
533 }
534 }
535 else
536 {
537 i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
538 s->s2->tmp.session_id_length);
539 if (i == 1)
540 { /* previous session */
541 s->hit=1;
542 }
543 else if (i == -1)
544 {
545 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
546 return(-1);
547 }
548 else
549 {
550 if (s->cert == NULL)
551 {
552 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
553 SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
554 return(-1);
555 }
556
557 if (!ssl_get_new_session(s,1))
558 {
559 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
560 return(-1);
561 }
562 }
563 }
564
565 if (!s->hit)
566 {
567 cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
568 &s->session->ciphers);
569 if (cs == NULL) goto mem_err;
570
571 cl=ssl_get_ciphers_by_id(s);
572
573 for (z=0; z<sk_SSL_CIPHER_num(cs); z++)
574 {
575 if (sk_SSL_CIPHER_find(cl,sk_SSL_CIPHER_value(cs,z)) < 0)
576 {
577 sk_SSL_CIPHER_delete(cs,z);
578 z--;
579 }
580 }
581
582 /* s->session->ciphers should now have a list of
583 * ciphers that are on both the client and server.
584 * This list is ordered by the order the client sent
585 * the ciphers.
586 */
587 }
588 p+=s->s2->tmp.cipher_spec_length;
589 /* done cipher selection */
590
591 /* session id extracted already */
592 p+=s->s2->tmp.session_id_length;
593
594 /* challenge */
595 memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
596 return(1);
597 mem_err:
598 SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
599 return(0);
600 }
601
602 static int server_hello(SSL *s)
603 {
604 unsigned char *p,*d;
605 int n,hit;
606 STACK_OF(SSL_CIPHER) *sk;
607
608 p=(unsigned char *)s->init_buf->data;
609 if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
610 {
611 d=p+11;
612 *(p++)=SSL2_MT_SERVER_HELLO; /* type */
613 hit=s->hit;
614 *(p++)=(unsigned char)hit;
615 if (!hit)
616 { /* else add cert to session */
617 CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
618 if (s->session->cert != NULL)
619 ssl_cert_free(s->session->cert);
620 s->session->cert=s->cert;
621 }
622 else /* We have a session id-cache hit, if the
623 * session-id has no certificate listed against
624 * the 'cert' structure, grab the 'old' one
625 * listed against the SSL connection */
626 {
627 if (s->session->cert == NULL)
628 {
629 CRYPTO_add(&s->cert->references,1,
630 CRYPTO_LOCK_SSL_CERT);
631 s->session->cert=s->cert;
632 }
633 }
634
635 if (s->session->cert == NULL)
636 {
637 ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
638 SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
639 return(-1);
640 }
641
642 if (hit)
643 {
644 *(p++)=0; /* no certificate type */
645 s2n(s->version,p); /* version */
646 s2n(0,p); /* cert len */
647 s2n(0,p); /* ciphers len */
648 }
649 else
650 {
651 /* EAY EAY */
652 /* put certificate type */
653 *(p++)=SSL2_CT_X509_CERTIFICATE;
654 s2n(s->version,p); /* version */
655 n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
656 s2n(n,p); /* certificate length */
657 i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
658 n=0;
659
660 /* lets send out the ciphers we like in the
661 * prefered order */
662 sk= s->session->ciphers;
663 n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d);
664 d+=n;
665 s2n(n,p); /* add cipher length */
666 }
667
668 /* make and send conn_id */
669 s2n(SSL2_CONNECTION_ID_LENGTH,p); /* add conn_id length */
670 s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
671 RAND_bytes(s->s2->conn_id,(int)s->s2->conn_id_length);
672 memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
673 d+=SSL2_CONNECTION_ID_LENGTH;
674
675 s->state=SSL2_ST_SEND_SERVER_HELLO_B;
676 s->init_num=d-(unsigned char *)s->init_buf->data;
677 s->init_off=0;
678 }
679 /* SSL2_ST_SEND_SERVER_HELLO_B */
680 /* If we are using TCP/IP, the performace is bad if we do 2
681 * writes without a read between them. This occurs when
682 * Session-id reuse is used, so I will put in a buffering module
683 */
684 if (s->hit)
685 {
686 if (!ssl_init_wbio_buffer(s,1)) return(-1);
687 }
688
689 return(ssl2_do_write(s));
690 }
691
692 static int get_client_finished(SSL *s)
693 {
694 unsigned char *p;
695 int i;
696
697 p=(unsigned char *)s->init_buf->data;
698 if (s->state == SSL2_ST_GET_CLIENT_FINISHED_A)
699 {
700 i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
701 if (i < 1-s->init_num)
702 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
703
704 if (*p != SSL2_MT_CLIENT_FINISHED)
705 {
706 if (*p != SSL2_MT_ERROR)
707 {
708 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
709 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
710 }
711 else
712 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_PEER_ERROR);
713 return(-1);
714 }
715 s->init_num=0;
716 s->state=SSL2_ST_GET_CLIENT_FINISHED_B;
717 }
718
719 /* SSL2_ST_GET_CLIENT_FINISHED_B */
720 i=ssl2_read(s,(char *)&(p[s->init_num]),s->s2->conn_id_length-s->init_num);
721 if (i < (int)s->s2->conn_id_length-s->init_num)
722 {
723 return(ssl2_part_read(s,SSL_F_GET_CLIENT_FINISHED,i));
724 }
725 if (memcmp(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length) != 0)
726 {
727 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
728 SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
729 return(-1);
730 }
731 return(1);
732 }
733
734 static int server_verify(SSL *s)
735 {
736 unsigned char *p;
737
738 if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
739 {
740 p=(unsigned char *)s->init_buf->data;
741 *(p++)=SSL2_MT_SERVER_VERIFY;
742 memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
743 /* p+=s->s2->challenge_length; */
744
745 s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
746 s->init_num=s->s2->challenge_length+1;
747 s->init_off=0;
748 }
749 return(ssl2_do_write(s));
750 }
751
752 static int server_finish(SSL *s)
753 {
754 unsigned char *p;
755
756 if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
757 {
758 p=(unsigned char *)s->init_buf->data;
759 *(p++)=SSL2_MT_SERVER_FINISHED;
760
761 memcpy(p,s->session->session_id,
762 (unsigned int)s->session->session_id_length);
763 /* p+=s->session->session_id_length; */
764
765 s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
766 s->init_num=s->session->session_id_length+1;
767 s->init_off=0;
768 }
769
770 /* SSL2_ST_SEND_SERVER_FINISHED_B */
771 return(ssl2_do_write(s));
772 }
773
774 /* send the request and check the response */
775 static int request_certificate(SSL *s)
776 {
777 unsigned char *p,*p2,*buf2;
778 unsigned char *ccd;
779 int i,j,ctype,ret= -1;
780 X509 *x509=NULL;
781 STACK_OF(X509) *sk=NULL;
782
783 ccd=s->s2->tmp.ccl;
784 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
785 {
786 p=(unsigned char *)s->init_buf->data;
787 *(p++)=SSL2_MT_REQUEST_CERTIFICATE;
788 *(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
789 RAND_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
790 memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
791
792 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
793 s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
794 s->init_off=0;
795 }
796
797 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
798 {
799 i=ssl2_do_write(s);
800 if (i <= 0)
801 {
802 ret=i;
803 goto end;
804 }
805
806 s->init_num=0;
807 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
808 }
809
810 if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
811 {
812 p=(unsigned char *)s->init_buf->data;
813 i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num);
814 if (i < 3)
815 {
816 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
817 goto end;
818 }
819
820 if ((*p == SSL2_MT_ERROR) && (i >= 3))
821 {
822 n2s(p,i);
823 if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
824 {
825 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
826 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
827 goto end;
828 }
829 ret=1;
830 goto end;
831 }
832 if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (i < 6))
833 {
834 ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
835 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
836 goto end;
837 }
838 /* ok we have a response */
839 /* certificate type, there is only one right now. */
840 ctype= *(p++);
841 if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
842 {
843 ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
844 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
845 goto end;
846 }
847 n2s(p,i); s->s2->tmp.clen=i;
848 n2s(p,i); s->s2->tmp.rlen=i;
849 s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
850 s->init_num=0;
851 }
852
853 /* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
854 p=(unsigned char *)s->init_buf->data;
855 j=s->s2->tmp.clen+s->s2->tmp.rlen-s->init_num;
856 i=ssl2_read(s,(char *)&(p[s->init_num]),j);
857 if (i < j)
858 {
859 ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
860 goto end;
861 }
862
863 x509=(X509 *)d2i_X509(NULL,&p,(long)s->s2->tmp.clen);
864 if (x509 == NULL)
865 {
866 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
867 goto msg_end;
868 }
869
870 if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
871 {
872 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
873 goto msg_end;
874 }
875
876 i=ssl_verify_cert_chain(s,sk);
877
878 if (i) /* we like the packet, now check the chksum */
879 {
880 EVP_MD_CTX ctx;
881 EVP_PKEY *pkey=NULL;
882
883 EVP_VerifyInit(&ctx,s->ctx->rsa_md5);
884 EVP_VerifyUpdate(&ctx,s->s2->key_material,
885 (unsigned int)s->s2->key_material_length);
886 EVP_VerifyUpdate(&ctx,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
887
888 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
889 buf2=(unsigned char *)Malloc((unsigned int)i);
890 if (buf2 == NULL)
891 {
892 SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
893 goto msg_end;
894 }
895 p2=buf2;
896 i=i2d_X509(s->session->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
897 EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i);
898 Free(buf2);
899
900 pkey=X509_get_pubkey(x509);
901 if (pkey == NULL) goto end;
902 i=EVP_VerifyFinal(&ctx,p,s->s2->tmp.rlen,pkey);
903 EVP_PKEY_free(pkey);
904 memset(&ctx,0,sizeof(ctx));
905
906 if (i)
907 {
908 if (s->session->peer != NULL)
909 X509_free(s->session->peer);
910 s->session->peer=x509;
911 CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
912 ret=1;
913 goto end;
914 }
915 else
916 {
917 SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
918 goto msg_end;
919 }
920 }
921 else
922 {
923 msg_end:
924 ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
925 }
926 end:
927 sk_X509_free(sk);
928 X509_free(x509);
929 return(ret);
930 }
931
932 static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
933 unsigned char *to, int padding)
934 {
935 RSA *rsa;
936 int i;
937
938 if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
939 {
940 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
941 return(-1);
942 }
943 if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
944 {
945 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
946 return(-1);
947 }
948 rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
949
950 /* we have the public key */
951 i=RSA_private_decrypt(len,from,to,rsa,padding);
952 if (i < 0)
953 SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
954 return(i);
955 }
956
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